date: (gi - unt digital library/67531/metadc704299/m2/1/high_re… · above the trailer deck. the...

eceiver Remarks:

15. DATA TRANSMITTED IAI ltDm 18) DocurncntiDrawing No. NO

IC) ID) Rev,

NO NO Transmitted IEI Title or Description of Data

1 WHC-SD-TP-ANAL-007 0 Sh ie ld ing Analys is o f t h e Long Length Contaminated Equipment T r a n s p o r t a t i o n Package

13. Pemi t /Pe rm i t Application No.:

NA 14. Required Response Date:

( F ) (GI ( H ) ( 1 ) Approval Rsason Ongp Rscstv-

"ator nator Trans. Dispo- Dispo-

minal d o n snmn

~ J A

id

Approval Designator IF)

E. S. Q. D or NiA (see WHC-CM-3-5. Sec 12.71

C t r l . NO. tl Approved

pproved u l c m e n t s [I A

~ 8; OrlglWtO, for Recawing Organization Signafura of EDT AUfhoriisd Rsprasanfafivs Data Cognizant Manag [I Disapproved ulcamnents

Reason far Transmittal IGI Dlsposltlon IHI & I l l 1 Approval 4 Review 1 Approved 4 Raviewed nolcommant 2. Release 5 Pod-Ravisw 2. Approved wicommsnt 5 Reviewed wlcommsnt 3 Information 6. Dtst. IRacsipt Acknow Raquirsdl 3. Disapproved wicommant 6 Recaipt acknowlsdgsd

BD-7400-172-2 (04 /94 ) GEF097

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1 Cag.Eng. J. V. Nelson9$#& 3 --7-9( HD-35

1 Cog. Mgr. J. Greenbo;g:\. &.dJw% 0-35 -

ED-7400-1 72-1 107191

IGI lH1

Disp son

WHC-SD-TP-ANAL-007, Rev. 0

Shielding Analysis of the Long Length Contaminated Equipment Transportation Package

Joseph V. Nelson Westinghouse Hanford Company, R ich land, WA 99352 U. S . Department o f Energy Con t rac t DE-AC06-87RL10930

EDT/ECN: 603245 UC: 513 Org Code: 8M730 Charge Code: N1782 B&R Code: EW3130010 T o t a l Pages:

Key Words: Long l e n g t h equipment, t r a n s p o r t a t i o n package, s h i e l d i n g a n a l y s i s , n u c l e a r waste

A b s t r a c t : A s h i e l d i n g a n a l y s i s o f a p o t e n t i a l l o n g l e n g t h contaminated equipment t r a n s p o r t a t i o n package was completed. The a n a l y s i s was performed t o suppor t t h e des ign o f t h e t r a n s p o r t a t i o n package and e x t e r n a l s h i e l d i n g .

I9kd

TRADEMARK DISCLAIMER. Reference h e r e i n t o any s p e c i f i c c m e r c i a l product, process, or se rv i ce by t rade name, trademark, manufacturer, o r otherwise, does not necessa r i l y c o n s t i t u t e or i n p l y i t s endorsement, recomnendation, o r f avo r ing by the Un i ted States GovePmnt or any agency t he reo f or i t s ContPactors o r subcontractors.

P r i n t e d i n the Un i ted States of America. To ob ta in copies o f t h i s docunent, contact : YHCIBCS Docwent Control Services, P.O. Box 1970, HaiLstop H6-08, Richland UA 99352, Phone (509 ) 372-2420; ax ( 5 0 9 ) 376-1989.

Approved for Public Release A-6400-073 (10195) GEF321

WHC-SD-TP-ANAL-007 Rev. 0

Page 2 o f 17

SHIELDING ANALYSIS OF THE LONG LENGTH CONTAMINATED EQUIPMENT TRANSPORTATION PACKAGE

1.0 INTRODUCTION

This report presents the results of a preliminary analysis of dose rates around a potential long length contaminated equipment (LLCE) transportation package. transportation package and external shielding.

The analysis was completed to support the design of this

The transportation package consists of a long polyethylene container, 21.3 m (70 ft) in length. for the LLCE. The length of this equipment ranges from 3.6 m (12 ft) to 18.9 m (62 ft). source term used in the shielding analysis of the proposed LLCE shipments was based on a worst-case evaluation.

Inside this pipe is a steel half-shell pipe used as a skid A variety of LLCE must be accommodated by the packaging.

The

2.0 DIRECT RADIATION SOURCE SPECIFICATION

The worst-case source term used in this analysis was the one used previously in the safety class analysis of LLCE packaging (Ref. 1). listed in Table 1.

2.1 Gamma Source

This source is

The source term listed in Table 1 was used as input to the ISOSHLD program (Ref. 2) to compute a photon source rate as a function of photon energy. resulting energy distribution is listed in Table 2. The total source rate was computed by ISOSHLD to be 4.68~10’~ photons/sec.

2.2 Beta Source

The

The beta source within the loaded LLCE container leads to an insignificant dose rate outside the perimeter of the trailer because of the shielding provided by steel in the LLCE, the steel skid plate, the grout filler, the polyethylene container, the trailer deck and external shielding. This shielding is described in Section 4 . 0 .

2.3 Neutron Source

Actinides listed in Table 1 are in very low concentrations. Thus, neutron dose rates were expected to be negligible compared to photon dose rates. This was confirmed using the method described in Reference 3 t o conservatively estimate neutron doses at several locations around the trailer. Since the neutron dose rates are insignificant, they are not reported.


Page 3 o f 17

Tab le 1. Rad ionuc l i de I n v e n t o r y i n t h e LLCE

* The format o as z . d x I O i e e .


Page 4 o f 17

Tab le 2. Photon Source Rate Energy D i s t r i b u t i o n

The format o f 1

~~~

Average Photon Energy Source Rate’

(MeV) ( P ho tons l sec ) 0.015 0.025 0.035 0.045 0.055 0.065 0.075 0.085 0.095 0.150 0.250 0.350 0.475 0.650 0.825 1.000 1.225 1.475 1.700 1.900 2.100 2.300 2.500 2.700 3.000 3.600

2.496Et12 1.372Et12 4.253Et12 8.709Et11 4.149Et11 3.177E+11 2.618Et11 4.993Et11 Z . 1 4 9 E t l l 3.002Et12 3.994Et11 2.002Et11 2.977Et11 2.928Et13 2 . 4 1 2 E t l l 3.261Et10 2.476Et12 5.809Et10 2.796Et09 1.189Et09 1 . 2 1 3 E t l l 1.935Et08 5.875Et07 1.282Et07 2.542Et06 1.198Et05

T o t a l 4.681Et13 source r a t e da ta i s z.dEtee, which i s interprf ?d as 2.d x lotee.

3.0 CALCULATIONAL METHOD

A l l dose r a t e c a l c u l a t i o n s were made u s i n t h e Han fo rd v e r s i o n (Ref . 4 o f t h e Monte C a r l o code MCNP (Ref . 5 ) . Fo r expe j i ency , i n i t i a l scop ing c a l c u l a t i o n s were made u s i n g t h e p o i n t - k e r n e l o p t i o n i n t h e code. However, any c o n t r i b u t i o n t o a dose r a t e f rom ground sh ine cannot be q u a n t i f i e d u s i n g t h e p o i n t - k e r n e l method. Because o f t h e min imal amount o f s h i e l d i n g on t h e bo t tom o f t h e t r a n s p o r t a t i o n package, f i n a l MCNP c a l c u l a t i o n s were made usin! t h e r i g o r o u s t r a n s p o r t mode t o account f o r ground sh ine . r e s u l t s p resen ted i n Sec t i ons 5.0 and 6.0 a r e f rom t h e t r a n s p o r t c a l c u l a t i o n s . Dose r a t e s were t a l l i e d i n MCNP u s i n g t h e p o i n t d e t e c t o r o p t i o n .

I n a l l cases, photon c ross s e c t i o n d a t a f rom t h e ENDF/B-V l i b r a r y were used, and photon f l u x e s were conver ted t o dose r a t e s u s i n g ANSI/ANS-6.1.1-1991 f l uence - to -dose convers ion f a c t o r s .

R e s u l t s f rom Monte C a r l o c a l c u l a t i o n s a re s u b j e c t t o s t a t i s t i c a l u n c e r t a i n t i e s . dose r a t e . However, t h e r e i s a s t a t i s t i c a l u n c e r t a i n t y on t h i s es t ima te . When u s i n g p o i n t d e t e c t o r s t o t a l l y dose r a t e s , MCNP u n c e r t a i n t i e s es t ima ted t o be l e s s t h a n 5% a r e g e n e r a l l y r e l i a b l e . 10% range t e n d t o be reasonab ly r e l i a b l e , b u t shou ld be t r e a t e d w i t h c a u t i o n .

Unless n o t e d o t e rw ise ,

MCNP p r o v i d e s an e s t i m a t e o f t h e u n c e r t a i n t y f o r each computed

U n c e r t a i n t y es t ima tes i n t h e 5% t o


Page 5 o f 17

For u n c e r t a i n t i e s l a r g e r than lo%, t h e r e g i v e n uncer ta !n ty , and r e s u l t s shou ld be magnitude es t ima tes .

4.0 CALCULATIONAL MODELS

can be a l a r g e u n c e r t a i n t y i n t h e t r e a t e d as, a t most, o r d e r o f

The LLCE c o n t a i n e r was rep resen ted as a l o n g po lye thy lene p i p e l y i n g on a s t e e l f l a t - b e d t r a i l e r . A p l a n v iew of t h e c a l c u l a t i o n a l model i s shown i n F i g u r e 1 , and a c ross s e c t i o n o f t h e model i s shown i n F i g u r e 2.

The p i p e was modeled as hav ing a l e n t h o f 21.3 m (OD) o f 170.2 cm (67.0 i n . ) and a wag1 th i ckness oc 3 .18 cm (1.25 i n . ) . A p o l y e t h y l e n e end cap 4.93 cm (1.94 i n . ) t h i c k was i n c l u d e d a t each end o f t h e p i p e . I n s i d e t h e p o l e t h l e n e c o n t a i n e r i s a s t e e l h a l f - s h e l l p i p e used as a s k i d f o r t h e LLCE. Txe s i i d has an OD o f 149.5 cm (58.9 in . ) and a t h i c k n e s s of 0 .48 cm (0.19 i n . . It runs t h e l e n g t h o f t h e po lye thy lene c o n t a i n e r , and i n c l u d e s s t e e l end p l a t e s 0.48 cm (0.19 i n . ) t h i c k .

The LLCE, wh ich s i t s on t h e bo t tom o f t h e sk id , was rep resen ted as a column o f s t e e l p i e hav ing a l e n g t h o f 18.9 m (62.0 f t and a way1 th i ckness o f 0.64 cm (0.25 i n . ) . h e p i p e was modeled as c o n t a i n i n g 9 .1 m (30 .0 f t ) o f u n i f o r m l y d i s t r i b u t e d t a n k waste a t one,end, w i t h t h e remain ing 9.8 m (32.0 f t ) vo ided. source m a t e r i a l was l o c a t e d a t t h e f r o n t o f t h e t r a i l e r . The space around t h e LLCE i n s i d e t h e po lye thy lene c o n t a i n e r was f i l l e d w i t h l ow d e n s i t y (0.32 g /cc ) g r o u t , wh ich i s i n tended t o p r o v i d e s t a b i l i t y and s h i e l d i n g .

The s t e e l t r a i l e r bed was modeled as b e i n 23 2 m (76 .0 f t ) l ong , 287 cm (113.0 i n . ) wide and 0.64 cm (0 .25 i n . ) t x i c k : The t o o f t h e t r a i l e r bed was s e t a t 228.6 cm (90.0 i n . ) above ground l e v e l . The poy e thy lene c o n t a i n e r was p o s i t i o n e d 33 .9 cm (13.3 i n . ) f rom t h e back o f t h e t r a i f e r .

Ex te rna l s t e e l s h i e l d s on a l l f o u r s ides o f t h e t r a i l e r a re planned. Along each s i d e o f t h e po lye thy lene c o n t a i n e r i s a s t e e l p l a t e t h a t runs t h e l e n g t h o f t h e c o n t a i n e r (21.3 m, o r 70.0 f t Each p l a t e , mounted on t o p o f t h e t r a i l e r bed, i s 1.27 cm (0 .50 i n . ) t k j c k and 111.8 cm (44.0 i n . ) t a l l .

A s t e e l l a t e was a l s o i nc luded i n t h e model d i r e c t l y i n f r o n t o f t h e po lye thyTene c o n t a i n e r . T h i s p l a t e , 152 cm (60.0 i n . ) square and 1.27 cm (0.50 i n . ) t h i c k , i s i n tended t o s t a b i l i z e t h e l o a d and p r o v i d e needed s h i e l d i n g . A d d i t i o n a l s h i e l d i n g t o t h e d r i v e r i s r o v i d e d by another s t e e l p l a t e l o c a t e d a t t h e f r o n t edge o f t h e t r a i l e r . T l i s s h i e l d i s 182.9 cm (72.0 i n . ) t a l l and ex tends t h e w i d t h o f t h e t r a i l e r . The s h i e l d t h i c k n e s s was v a r i e d f rom 2.54 cm (1.0 i n . ) t o 12.7 cm (5.0 in . ) t o de termine t h e e f f e c t o f s h i e l d t h i c k n e s s on t h e dose r a t e a t t h e t r u c k d r i v e r ' s l o c a t i o n , assumed t o be 152 cm (60 i n . ) i n f r o n t o f t h e t r a i l e r .

A 2.54 cm (1.0 i n . ) t h i c k g u i l l o t i n e s h i e l d i s l o c a t e d a t t h e r e a r o f t h e t r a i l e r t o o l y e t h y l e n e p i e, and t!e c o n t a i n e r v o i d i s f i l l e d w i t h l ow d e n s i t y r o u t . T l i s s h i e l d i s 2 1 t . 4 cm (84 .0 i n . ) t a l l , and runs t h e w i d t h o f t h e t r a i g e r . access t o t h e c o n t a i n e r , t h e r e i s an opening i n t h e top -cen te r p o r t i o n o f . t h e s h i e l d . T h i s opening i s 170.2 cm (67.0 i n . ) wide and beg ins 21. cm (8 .5 i n . ) above t h e t r a i l e r deck.

The ground was modeled as a conc re te su r face . A l l a i r spaces were modeled as vo ided reg ions . Thus, w h i l e ground sh ine was accounted f o r i n t h e model, t h e e f f e c t o f photon s c a t t e r i n g i n a i r (sky sh ine ) was n o t . Composi t ions f o r a l l m a t e r i a l s used i n t h e c a l c u l a t i o n a l model a re g i ven i n Tab le 3.

70.0 ft), an o u t e r d iamete r

an OD o f 108.0 cm (42 .5 i n . )

The end w i t h t h e r a d i o a c t i v e

r o t e c t workers w h i l e t h e back cover i s p laced on t h e

To p r o v i d e

6' high sh ie ld (var i ab1 e th ickness)

s t e e l p l a t e (5'xS'xO. 5")

s ide sh ie ld

'skid

t r a i 1 e r bed

container

g u i l l o t i n e sh ie ld

dr iver 1

I J

1 01 C VI

m

* Y E =

g 3 - a ET Y

-0

Y m E .- I- 0 E 0 u

L: Y

E W i

m

m E 0 -1

U

0 > .-

- - 1 T A B


Page 6 o f 17

H

G

. F

- E

- D

+ c

Let te rs A - I ind ica te loca t ions where dose ra tes ,were computed Dose r a t e s were a l s o computed a t the dr iver loca t ion .

Figure 1. Plan View o f MCNP Calculational Model


Page 7 o f 17

Elevation (cm) polyethylene container 1

-

400 - -

-

- 300 -

200 -

-

100 -

-

skid

long length contaminated

equipment

. s ide sh ie ld

t r a i l e r bed

+

+

+ ground

0 -

t = e leva t ions a t which dose r a t e s were t a l l i e d

Figure 2 . Cross Section o f MCNP Calculat ional Model


Page 8 o f 17

Tab le 3 . M a t e r i a l Composi t ions

M a t e r i a l Weight ( d e n s i t y ) Element F r a c t i on S tee l Fe 1.000 (7.8 q l c c ) Po lye thy lene H 0.143 (0.95 q / c c ) C 0.857

5 . 0 RESULTS

Dose r a t e s were computed f o r p o i n t s a t t h e f r o n t , back and s i d e o f t h e t r a i l e r , i n c l u d i n g t h e approximate d r i v e r l o c a t i o n . The l o c a t i o n s where dose r a t e s were computed a re i n d i c a t e d i n F igu re 1. P o i n t s A and B a re beh ind t h e t r a i l e r . t h e u i l l o t i n e s h i e l d i s , w h i l e p o i n t 8 i s beh ind t h e t a l ! s e c t i o n o f t j i s sh iegd. P o i n t s C t h rough H a re a long t h e s i d e o f t h e t r a i l e r , and p o i n t I i s a t t h e f r o n t - c e n t e r o f t h e t r a i l e r . dose r a t e s were computed a t . 0 , 1 and.2 meters f rom t h e edge o f t h e t r a i l e r , and a t 6 d i f f e r e n t e l e v a t i o n s rang ing f rom ground l e v e l t o 305 cm (120 i n . ) above t h e ground.

P o i n t A i s a t t h e back-center o f t h e t r a i l e r where t h e open in i n

For a l l p o i n t s A th rough I ,

Dose r a t e s a t some e l e v a t i o n s i n f r o n t o f t h e t r a i l e r ( p o i n t I and t h e d r i v e r l o c a t i o n ) depend on t h e th i ckness o f t h e f r o n t s t e e l s h i e l d . MCNP c a l c u l a t i o n s were made us ing t h r e e th icknesses , 2.5, 7 .6 and 12.7 cm (1 , 3 and

Resu l t s o f t h e dose r a t e c a l c u l a t i o n s a t p o i n t s A th rough I are shown 7 n i Y d i e 4 .

The l o c a t i o n o f t h e d r i v e r was assumed t o be 152 cm (60 i n . ) i n f r o n t o f t h e t r a i l e r , and o f f s e t 91 cm (36 i n . ) f rom t h e t r a i l e r c e n t e r l i n e . Two e l e v a t i o n s were chosen as r e r e s e n t a t i v e o f t h e d r i v e r ' s h e i h t above t h e ground w h i l e i n t h e cab o f tRe t r u c k . These e l e v a t i o n s a re 783 cm (72 i n . )


Page 9 o f 17

and 244 cm (96 i n . ) above ground l e v e l . d r i v e r l s l o c a t i o n as a f u n c t i o n o f s h i e l d t h i c k n e s s a r e g i v e n i n Tab le 5. s h i e l d i n g p r o v i d e d by t h e t r u c k cab and some o t h e r com onents, such as ax les , wheels and frames, were n o t accounted f o r i n t h e c a l c u y a t i o n a l model.

Tab le 4. Dose Rates around t h e T ranspor t T r a i l e r (Sheet 1)

The computed dose r a t e s a t t h e Any

E l e v a t i o n Dose Rate (mrem/hr)b P o i n t a (cm) Con tac t 1 meter 2 meter

3.1Et00, 2.4Et00 1.9Et00, 4.OEt00, 3.4Et00' 2.4Et00 3.4Et00 2.8Et00" 2.2E+00

244

3.1E+00 3.2Et00 3.3Et00 3.5Et00 3.4Et00 3.5Et00 3.4Et00: 3 .2Et00 3.3E+00 3.5Et00 2.9E+00 3.1Et00

244 1.1Et00' 2.8E+00 3.2Et00

5.5Et02 4.2Et02 3.1Et02 7.OEt02 5.1Et02 3.3Et02 7.8Et02 4.9Et02 3.OEt02 8.2Et02 4.OEt02 3.OEt02

244 4.7Et02 4.4Et02 3.1Et02

x 10'ee.

rder-of -


Page 10 o f 17

[ a b l e 4. Dose Rates around t h e T ranspor t T r a i l e r (Sheet 2)

a b

E l e v a t i o n Dose Rate (mrem/hrIb P o i n t a (cm) Contact 1 mete r 2 me te r

G 0 5.6Et02 4.7Et02 3.2Et02 7.OEt02 5.OEt02 3.4Et02

122 61 7.8Et02 4.8Et02 3.OEt02 183 8.2Et02 4.OEt02 3.OEt02 244 4.6Et02 4.2Et02 3.OEt02 305 4.4Et02 4.3Et02 3.2Et02

H 0 2.5Et02 2.2Et02 1.8Et02 61 2.7Et02 2.4Et02 1.9Et02

122 2.4Et02 2.1Et02 1.8Et02 183 1.9Et02 2.2Et02 1.9Et02 244 4.1Et02 2.6Et02 1.9Et02 305 4.5Et02 2.6Et02 Z.OEt02

I 0 2.5Et02 1.4Et02 9.OEt01 w 2 5 cm 61 2.8Et02 1.6Et02 9.9Et01 t ( l . . f r o n t 122 2.8Et02 1.6Et02 8.3Et01

s h i e l d 183 3.OEt02 1.2Et02 6.9Et01 244 1.2Et02 1.3Et02 7.4Et01 305 1.8Et02 1.4Et02 7.8Et01

I 0 2.6Et02 1.5Et02 9.2Et01 w 7 6 cm 61 3.OEt02 1.7Et02 9.8Et01 t ( l . . f r o n t 122 2.9Et02 1.6Et02 6.7Et01

s h i e l d 183 3.2Et02 7.8Et01 3.1Et01 244 9.4Et00 3.OEt01 2.3Et01 305 1.5Et01 2.5Et01 2.1Et01

I 0 2.6Et02 1.6Et02 9.1EtOl 3.OEt02 1.6Et02 9.6Et01 2.9Et02 1.6Et02 6.4Et01

s h i e l d 183 3.2Et02 7.6Et01 3.OEt01 244 3.6Et00 2.7Et01 2.OEt01 305 3.5Et01 1.6Et01 1.7Et01

I Figure 1 for Location of points. ! format of the dose ra te data i s z.dEtee, uhich i s interpreted as 2.d x 10-e.


Page 11 o f 17

E l e v a t i o n above Ground

183 cm (72" ) 244 cm (96" )

Tab le 5 . Dose Rates a t D r i v e r ' s Loca t ion as a Func t i on o f F r o n t S h i e l d Th ickness

Dose Rate (mrem/hr) 2.5 cm (1") 7.6 cm (3") 12.7 cm (5 " )

77 42 40

78 25 22

The MCNP u n c e r t a i n t y es t ima tes assoc ia ted w i t h most dose r a t e s g i ven i n Tab les 4 and 5 a re l e s s than lo%, i n d i c a t i n they a re p robab ly r e l i a b l e es t ima tes . However, a t l o c a t i o n s A, B and C i n f i g u r e 1, near t h e r e a r o f t h e t r a i l e r , u n c e r t a i n t y es t ima tes ranged up t o 70%. l ow dose r a t e s . Because r e l a t i v e l y few photons reached, these l o c a t i o n s i n t h e MCNP s i m u l a t i o n , t h e s t a t i s t i c s were poor . Dose r a t e s i n Tab le 4 w i t h u n c e r t a i n t i e s l a r g e r than 10% a re f l agged . The f l a g g e d va lues shou ld be used as order -o f -magn i tude es t ima tes on ly .

MCNP t r a n s p o r t c a l c u l a t i o n s i n d i c a t e d t h a t t h e e f f e c t o f ground sh ine i s v e r y s i g n i f i c a n t (16 t o 18 mrem/hr) a t t h e d r i v e r ' s l o c a t i o n . Ground sh ine was a l s o r e l a t i v e l y s i g n i f i c a n t a t t h e r e a r o f t h e t r a i l e r , where dose r a t e s a re l o w e s t . round sh ine c o n t r i b u t e d 2 - 3 mrem h r t o t h e dose r a t e . N e g l e c t i n g groun! shine, dose r a t e s beh ind t h e t r a i ( e r were computed t o be l e s s than 1 mrem/hr (based on p o i n t - k e r n e l r e s u l t s ) . A t t h e s i d e o f t h e t r a i l e r near t h e source reg ion , ground sh ine d i d n o t appear t o c o n t r i b u t e s i g n i f i c a n t l y t o t h e dose r a t e .

6 .0 SHIELDING EVALUATION AND CONCLUSIONS

The c a l c u l a t e d peak dose r a t e s f o r t h e f r o n t , s ides and back o f t h e t r a i l e r a re summarized i n Tab le 6. Dose r a t e s a long t h e s i d e a re as h i g h as 1,500 mrem/hr. I n genera l , con tac t dose r a t e s peak near head l e v e l (183 cm o r 72 i n . ) . T h i s i s j u s t below t h e e l e v a t i o n o f t h e t r a i l e r bed and t h e s h i e l d s mounted on i t ( s e e F igu re 2 ) . These s h i e l d s a re o n l y p a r t i a l 1 e f f e c t i v e i n reduc ing dose r a t e s around t h e t r a i l e r because o f t h e min ima l go t tom s h i e l d i n g and t h e h e i g h t o f t h e t r a i l e r bed above t h e ground (228 cm o r 90 i n . ) .

Wi th t h e c u r r e n t des ign , t h e s h i e l d s a t t h e f r o n t o f t h e t r a i l e r cannot reduce t h e dose r a t e a t t h e d r i v e r ' s l o c a t i o n t o 2 mrem/hr. s h i e l d i n g o r f r o n t s h i e l d i n g t h a t extends w e l l below t h e e l e v a t i o n , o f t h e t r a i l e r bed i s needed. I f t h e f r o n t s h i e l d i s extended down t o e l i m i n a t e b o t h t h e d i r e c t exposure f rom beneath t h e s h i e l d and ground shine, and i t s s t e e l t h i c k n e s s i s i nc reased t o 13 cm (5 i n . ) , t h e d r i v e r ' s dose r a t e would be reduced t o about 1 mrem/hr w i t h t h e source te rm used i n t h i s a n a l y s i s . A lso , i f t h e s i d e s h i e l d s were extended down f rom t h e t r a i l e r bed, t h e peak c o n t a c t dose r a t e a t t h e s i d e o f t h e t r a i l e r c o u l d be reduced f rom 1,500 mrem/hr t o about 870 mrem/hr, w i t h o u t i n c r e a s i n g s h i e l d th i ckness .

Dose r a t e s a t t h e r e a r o f t h e t r a i l e r a re ve ry l ow compared t o peak dose r a t e s on t h e s i d e and f r o n t o f t h e t r a i l e r , as shown i n Tab le 6. The r e a t e r d i s t a n c e f rom t h e r a d i a t i o n source and t h e s h i e l d i n g e f f e c t o f t i l e l ow-dens i t y g r o u t f i l l e r a re t h e main reasons f o r t h i s .

The h i g h u n c e r t a i n t i e s a re due t o

There,

A d d i t i o n a l bo t tom


Page 12 o f 17

L o c a t i o n

Peak Sidea ( p o i n t F ) Center L i t e , Back ( p o i n t A) O f f Center , Back ( p o i n t B) Center L ine , F r o n t ( p o i n t I a

- 5 .1 cm s h i e l d b - 7 .6 cm s h i e l d b

- 2 .5 cm s h i e l d b

As ment ioned i n Sec t ion 3.0, photon s c a t t e r i n g i n a i r ( sky sh ine) was n o t accounted f o r i n t h e r e s u l t s shown i n Tables 4 5 and 6. A se a r a t e c a l c u l a t i o n i n d i c a t e d t h a t t h e e f f e c t o f sky sh ine i s r e l a t i v e y y smal l , b u t n o t i n s i g n i f i c a n t a t some l o c a t i o n s . I n p a r t i c u l a r , accoun t ing f o r sky sh ine adds up t o 2 mrem/hr t o t h e dose r a t e near t h e r e a r o f t h e t r a i l e r , and 6 t o 7 mrem h r a t t h e d r i v e r ' s , l o c a t i o n when t h e r e i s a 12.7 cm (5 i n . ) t h i c k s h i e l d a t t h e f r o n t o f t h e t r a i l e r t r a n s p o r t a t i o n package shou id cons lde r t h e e f f e c t s o f sky sh ine .

Thus, f i n a l s h i e l d i n g ana lyses ,o f t h e LLCE

Dose Rate (mrem/hr) Contac t 1 meter 2 meter

1500 950 670

4.0 3.4 2.4

3.9 2.9 2.3

300 160 99 320 170 98 320 160 96

7.0

1.

2 .

3 .

4.

5.

REFERENCES

Memo, H. J. Goldberg t o J. s. Burgess, "Sa fe ty C lass A n a l y s i s o f Long Length Equipment Packaging, 8M730-HJG-95-012, A p r i l 13, 1995.

R i t tmann, P . D., ISO-PC Vers ion 1.98 - U s e r ' s Guide, WHC-SD-WM-UM-030, Rev 0, May 1995.

Memo, J. V . Nelson t o J;4 R. Green, "Es t ima t ion o f Neut ron Dose Rates f rom Nuc lea r Waste Packages, 8M730-JVN-96-007, March 8, 1996.

C a r t e r , L . L., C e r t i f i c a t i o n o f MCNP Vers ion 4A f o r WHC Corn u t e r P l a t f o r m s , WHC-SD-MP-SWD-30001, Rev. 7, ECN 605701, West ingtouse Hanford Company, R ich land, Washington, January, 1995.

B re i sme is te r , J. F . , E d i t o r , MCNP - A General Monte Car lo N - P a r t i c l e T ranspor t Code, Ve rs ion 4a, Los Alamos Na t iona l Labora to ry r e p o r t LA- 12625, Los Alamos, New Mexico, 1993.


Page 13 o f 17

APPENDIX LISTING OF SAMPLE MCNP INPUT F I L E

Long Length equipnent t r a i l e r - - 7 0 f t container - t ranspor t calc. c t r l r70e - 1" t h f r o n t s h i e l d - c a l c dose on 3 sides o f t r a i l e r

1 2 3 4 5 6 7 8

9 10 11

12 13 14 15 16 30 31 32

998

999

1

3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

29 30 31 32 33 34 36 37 38 39 40 41 42 43 44 45 46 50

28

1 2

2 1 1

5

4 1

1 1

1 0 5

5 0

0

-7.80 -0.95 -0.95 -0.95 -7.80 -7.80 -7.80 -0.32

-1.6 -7.80 -7.80

-7.80 -7.80 -7.80 -7.80

-2.28 -2.28 -2.28

999

228.600 227.965

0.0 287.020

0.0 2316.480

143.510 143.510 330.0413

33.8836 2167.4836

80.010 1664.970

143.510 143.510 38.81 12

2162.5560 84.9376

1660.0424 39.2875

21 62.0798 85.4139

1659.5662 1247.8798

143.5 10 143.510 441.96 250.34

58.40 228.62

2.54 340.36

1.27 285.75

381 .OO 67.31

219.71 411.48

231 3.94 272.32

0.00 -7.00

-14.00 -21.00

-600.00 2900.00

2168.75

.. 51 52 py -600.00

335.4324 335.4324

330.0413 330.0413

309.73 309.73

-6

53 )

I t r l r deck ;szdr container

$sk id s ides $sk id back end I s k i d f r o n t end $res t o f container

$source reg ion I L L E p ipe I G i l a t i n e sh ld

po l endcap $front pory endcap

I R t . s ide p l a t e $Lef t s ide p l a t e $5'x5'x.5" f r o n t p l a t e $Front sh ld (6 ' t a l l ) $ Ins ide errpty end of p ipe $top grnd l e v e l I2nd grnd level 13rd grnd leve l I outs ide cont., above grnd

-999 $outside universe

f top of t l r deck $bottom of tr lr deck


Page 14 o f 17

600.00 9;; 1158.240 143.510 0.0 4000 I outside universe marker

1 0

Ct sd

#

c Average Source Total c E , MeV photons/sec

l a

. __________..______..--..-

c si2 0. 53.34

-" 456198 c c

ml 26000 1.0 I Fe c

m2 1001.Olp 0.666666 S H polyethylene (CH4)n 6000 0.333334 S C

c ni i

d c

m5

8016.01~ 0.21 7014.01~ 0.79

lOOl.0lp ,4372 6000 ,0170 7014.01~ .0579 8016.01~ .3725 11023.01p .0975 13027.01~ ,0113 15031.01~ ,0011 17000 .0029 19000 .0026 8016.01p -.4407 14000 -.2157 20000 -.1306 26000 -.0788 13027.01~ -.0607 12000 -.0376 19000 -.0066 11023.01p -.Ole2 22000.01p -.0049 1001.Olp -.0031 25055.01~ -.0013 15031.01p -.OD09 16032.01~ -.0009

S o a i r I N

IH 101 SY slurry IC IN SO $Na SA l IP IC I SK So grout weight f rac t ion $Si sca SFe $A l

Eg SN a $1 i SH S44n SP SS

WHC-SD-TP-ANAL-007 Rev . 0

Page 15 o f 17

df 0

c f c5 f5:p

c c C f15:p

f25:1,

cold end dose ra te traverse I X Y 2

0 31 0 0 31 61 0 31 122 0 31 183 0 31 244 0 31 305

-100 31 -100 31 61 -100 31 122 -100 31 183 -100 31 244 -100 31 305 -200 31 -200 31 61 -200 31 122 -200 31 183 -200 31 244 -200 31 305

0 144 0 144 61 0 144 122 0 144 183 0 144 244 0 144 305

-100 144 0 -100 144 61 -100 144 122 -100 144 183 -100 144 244 -100 144 305 -200 144 -200 144 61 -200 144 122 -200 144 183 -200 144 244 -200 144 305

RO 1

1 1 1 1

1 1 1 1 1 1

1

1 1 1 1 1 1 1 1 1 1 1 1 1

1 1 1 1

1

t r a i l e r side dose Pate t raverses

X 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 X

625 625 625 625 625 625 625 625

Y 0 0 0 0 0

-100 -100 -100 -100 -100 -100 -200 -200 -200 -200 -200 -200

Y 0 0 0 0 0 0

-100 -100

2 0

61 122 183 244 305

61 122 183 244 305 0

61 122 183 244 305

2 0

61 122 183 244 305 0

61

RO

1

1 1 1 1

1 1

1 1 1 1 1 1 1

RO

1 1

1 1 1 1

$ contact OR

f 1 meter OR

I 2 meter OR

I con tac t OR

I 1 meter OR

$ 2 meter OR

I Rear corner o f t r a i l e r f Contact OR

f 1 meter OR

I 2 meter OR

$ m i d non SPC, side t r l r I Contact DR

I 1 mter DR

f35:p

f45:p

f55:p

f65:p

625 625 625 625 625 625 625 625 625 625

1248

1248 1248 1248 1248

$ X

$248

1248 1248

1248 1248

1248 1248

1248 1248 1248 1248 1248 1248

1705 1705 1705 1705 1705 1705 1705 1705 1705 1705 1705 1705 1705 1705 1705 1705 1705

2162 2162 2162 2162 2162 2162 2162 2162 2162 2162 2162 2162 2162 2162 2162 2162 2162 2162

2300 2300 2300 2300 2300 2300 2300 2300 2300 2300 2300 2300 2300 2300 2300 2300

I X

f X

B X

-100 -100 -100 -100 -200 -200 -200 -200 -200 -200

Y 0 0 0

0 0

-100 -100 -100 -100 -100 -100 -200 -200 -200 -200 -200 -200

Y 0 0 0 0 0 0

-100 -100 -100 -100 -100 -200 -200 -200 -200 -200 -200

Y 0 0

0 0 0

-100 -100 -100 -100 -100 -100 -200 -200 -200 -200 -200 -200

Y 0 0 0

0 0

-100 -100 -100 -100 -100 -100 -200 -200 -200 -200


Page 16 o f 17

$ 2 meter OR

f backed o f src. side t r l r f Contact DR

I 1 meter OR

$ 2 meter OR

$ mid src, side t r l r I Contact DR

f 1 meter D R

$ 2 meter DR

f f rontend src, side t r l r I Contact OR

f 1 meter OR

f 2 meter OR

I f ron t corner o f t r a i l e r I Contact OR

f 1 meter DR

$ 2 meter DR

f 7 5 : p

fc85 f 8 5 : p

2300 -200 2300 -200

f X Y 2317 144 2317 144 2317 144 2317 144 2317 144 2317 144 2417 144 2417 144 2417 144 2417 144 2417 144 2417 144 2517 144 2517 144 2517 144 2517 144 2517 144 2517 144

Truck Driver dose 2469 235 2469 235 2469 235 2469 235

244 305

0 61 122 183 244 305 0

61 122 183 244 305

0 61 122 183 244 305

rate: 3 ' 122 183 244 310


Page 17 o f 17

1 i

RO $ end tr lr t h r u t r u c k

i 1 f 1 m D R

1 1 1

1 O 2 m D R 1 1

1

l e f t of CL, 5 ' ahead of tr lr

1

1 I Level with src

WHC-SD-TP-ANAL-007

A t t . -1 Rev. 0

CHECKLIST FOR INDEPENDENT TECHNICAL REVIEW

Rev iewer (s ) : R. L . Simons

I . Method(s) o f Review

I n p u t d a t a checked f o r accuracy Independent c a l c u l a t i o n per formed

Comparison t o exper iment o r p r e v i o u s r e s u l t s

Hand c a l c u l a t i o n A1 t e r n a t e computer code:

A l t e r n a t e method ( d e f i n e )

11. C h e c k l i s t ( e i t h e r check o r e n t e r NA i f n o t a p p l i e d )

Hand c a l c u l a t i o n s checked f o r e r r o r s

." , '-.'", Use o f resource o u t s i d e range o f e s t a b l i s h e d , v a l i d i t i s j u s t i f i e d So f tware runst reams c o r r e c t and c o n s i s t e n t w i t h r e s u f t s So f tware o u t p u t c o n s i s t e n t w j t h i n p u t R e s u l t s c o n s i s t e n t w i t h a p p l i c a b l e p r e v i o u s exper imen ta l o r a n a l y t i c a l f i n d i n g s

t a s k requ i remen ts and/or e s t a b l i s h e d l i m i t s o r c r i t e r i a

U n c e r t a i n t y assessment a p p r o p r i a t e and reasonab le

( / ) R e s u l t s and conc lus ions a d d r e s s , a l l p o i n t s and a r e c o n s i s t e n t w i t h

( / ) Conclus ions c o n s i s t e n t w i t h a n a l y t i c a l r e s u l t s and e s t a b l i s h e d

14 ::;::(define)

111. Comments:

I V . REVIEWER: f-22-76

WHC-SO-TP-ANAL-007

A t t . - 2 Rev. 0

CHECKLIST FOR INDEPENDENT TECHNICAL REVIEW

DOCUMENT REVIEWED

TITLE: SHIELDING ANALYSIS OF THE LONG LENGTH CONTAMINATED EOUIPMENT NUMBER: WHC-SD-TP-ANAL-007

TRANSPORTATION PACKAGE

I . Method(s) o f Review

I n p u t d a t a checked f o r accuracy Independent c a l c u l a t i o n per formed

Comparison t o exper iment o r p r e v i o u s r e s u t s , . Hand c a l c u l a t i o n A1 t e r n a t e computer code:

[ x 1 A l t e r n a t e method (de f ine)&5y& .d : d y e 1 . 1 ~ ; L 7 ~ ~ y k ~ z ~ 11. C h e c k l i s t ( e i t h e r check o r e n t e r NA i f n o t a p p l i e d ) ,+ L e v v c c t , , c r s .

111.

Task comp le te l y d e f i n e d A c t i v i t y c o n s i s t e n t w i t h t a s k s p e c i f i c a t i o n Necessary assumptions e x p l i c i t l y s t a t e d and suppor ted Resources p r o p e r l y i d e n t i f i e d and r e f e r e n c e d Resource documentat ion a p p r o p r i a t e f o r t h i s a p p l i c a t i o n I n p u t d a t a e x p l i c i t l y s t a t e d I n p u t d a t a v e r i f i e d t o be c o n s i s t e n t w i t h o r i g i n a l source Geometr ic model adequate r e p r e s e n t a t i o n o f a c t u a l geometry M a t e r i a l p r o p e r t j e s a p p r o p r i a t e and reasonab le Mathemat ica l d e r i v a t i o n s checked i n c l u d i n g d imens iona l c o n s i s t e n c y Hand c a l c u l a t i o n s checked f o r e r r o r s Assumptions e x p l i c i t l y s t a t e d and j u s t i f i e d Computer s o f t w a r e a p p r o p r i a t e f o r t a s k and used w i t h i n range o f v a l i d i t y

(&/A) Use o f resource o u t s i d e range o f e s t a b l i s h e d , v a l i d i t y i s j u s t i f i e d ( x ) Sof tware runst reams c o r r e c t and c o n s i s t e n t w i t h r e s u l t s ( x ) Sof tware o u t p u t c o n s i s t e n t w i t h i n p u t (NA) R e s u l t s c o n s i s t e n t w i t h a p p l i c a b l e p r e v i o u s exper imen ta l o r

anal t i c a l f i n d i n g s (NA) R esu f t s and conc lus ions address a l l p o i n t s and a r e c o n s i s t e n t w i t h

t a s k requ i remen ts and/or e s t a b l i s h e d l i m i t s o r c r i t e r i a (44) Conclus ions c o n s i s t e n t w i t h a n a l y t i c a l r e s u l t s and e s t a b l i s h e d

(NR U n c e r t a i n t y assessment a p p r o p r i a t e and reasonab le ( 1 b:;::(define)

Comments :

To From

D i s t r i b u t i o n Nuc lea r Phys ics and S h i e l d i n g Project Tit lelWork Order S h i e l d i n g A n a l y s i s o f t h e Long Length Contaminated Equipment T r a n s p o r t a t i o n Package

J . R. Green

J . Greenborg ( 2 cop ies )

W . A. McCormick

J . V . Nelson

A. L. Ramble

R. L. Simons

R. E . T r a i s t e r

E. M. V e i t h

Cen t ra l F i l e s ( o r i g i n a l t 3 )

Page 1 of 1 Date May 6, 1996 EDT No. 603245 ECN No. NA

61-11

HO-35

61-11

HO-35

A3-38

HO-35

83-63

H5-68

A3-88 kd

Text Text Only Attach./ Name MSlN Wi th All Appendix

Attach. Only

A-6000-135 (01193) UEF067

EDT/ECN Only

date: (gi - unt digital library/67531/metadc704299/m2/1/high_re… · above the trailer deck. the...

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