NEF-6.4A(5/89)

CALCULATION ANALYSIS

Nuclear Engineering Department

SECTION SHEET 1 OF 9

I.D. NO. 0 O OQ~Eld PLANT Q~ UNIT / Q

SAFETY RELATED YES ~ NOSYSTEM e~ II 9 + o ah

R,HR

TITLE

FILE LOCATION

MICROFILM NO.

COMPANY

CALCULATED BY:

CHECKED BY:

APPROVED BY:

~. A/DATE

/ ~ (pg,DATE

Jd'ATE

PROBLEM DESCRIPTION:

(s

DESIGN BASIS OR REFERENCES:

METHOD OF VERIFICATION:

REVISIONS

NO. REASON FOR CHANGEPREP'D

BY DATECKD.BY DATE

APVD.BY DATE

SE CTION

ENGINEER

NED REC RD-NELANTCOPYcVj

METHOD OF VERIFICATION:

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PLANT LIFETIMEDATE TO FLANT

0 NON PERMANE.'ITMINIMUiVlRETENTION YRS.

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HXP900904JEWPage 2 of 3

RHR PUMP NPSH AT SATURATED CONDITIONS

~Pur ose

Westinghouse Owners Group (WOG) letter OG-90-44 dated August 2, 1990,identified a concern with regard to the operation of the residual heatremoval (RHR) pumps while the plant is at half loop.

The letter states that, typically, a maximum reactor coolant system (RCS)temperature of 160 F is used to calculate the available NPSH for the RHR

0

pump. While reviewing Generic Letters 87-12, "Loss of RHR while the RCS

is partially filled," and 88-17, "Loss of decay heat removal," it becameclear to the WOG that under these conditions, the RHR pump could beoperating in the RHR mode taking suction from the RCS hot leg atsaturated rather than subcooled conditions.

I

This calculation will determine if adequate NPSH is available to operatethe RHR pump under saturated conditions, which could occur as a result ofa loss of RHR event at mid-loop.

Conclusion

As shown on the attached graph (Attachment 1), there is adequate NPSHavailable for the RHR pumps to operate when they are taking suction from

0the RCS at saturated conditions (212 F when vented to atmosphericressure).P

Westinghouse Owners Group (WOG) Letter OG-90-44 dated August 2,1990, (Attachment 4)

RCS level at half-loop, 614"-0" per procedure 2-0HP-4021.002.005

3. RHR pump suction elevation 575'-0" per Drawing No. 1-5415-16

4. Hydraulic friction loss calculation program HFLC5 available in theHEP&T Section file 13.22.2.1

5. Ingersoll-Rand curve N-315 typical for the RHR pumps at Cook NuclearPlant (Attachment 5)

6. The computer print-out attached is output from the HFLC5 program(Attachment 2). The input for the program (flow, pipe length,fittings and valves) is tabulated on the attached pipe friction datasheet (Attachment 3). The data sheet was generated from thedrawings listed below:

1-54211-54151-RH-29

1-RH-281-SI-41-SI-2

HXP900904JEUPage 3 of 3

Net positive suction head (NPSH) formula taken from CameronHydraulic Data, 16th edition Pg 1-10

For positive (flooded) suctionNPSH h - h + h - h

a vpa st fswhere: h - absolute pressure (in feet) on surface of the

aliquid supply levelh vapor pressure of the liquid at thevpa

temperature being pumped ( in feet)h static height (in feet) that liquid supplystlevel is above or below the pump centerlineh all suction line losses (in feet)fs

Calculation

Net Positive Suction Head availableNPSH h - h + h - h

a a vpa st fswhere: fluid water at 212 F

0

h 14.696 psi (33.96 feet) - 1 atmosphere

h 14. 696 psi (33. 96 feet)vpa(Standard Handbook for Mechanical Engineers 7th editionMarks, Table 28, page 4-38)

h 614 - 575 39 feetsthalf loop elevation - 614 feetpump centerline - 575 feet

hf 6.93 feet with fluid flow of 3000 gpm (ref. Attachment 2)fs

NPSH - 33.96 - 33.96 + 39 - 6.9332.07 feet

Similarly NPSH was calculated for the following flows:a

Flow m NPSHa feet

30003500400045005000

32.0729.6226.8323.6520.1

Residual Heat Removal Pump

500

450

400

350

300

250

200

150

Total head (ft) HPSH

100

90

80

70

60

50

40

30

100

50

0

-"20

10

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

GALLON PER MINUTE

PUMP CURVE ~ NPSHr ~ NPSIIa(212 F)

Pf4 io/D.G/qo

4

. PIPE FRICTION

a:rhrnpsh

CALC — INPUT FILE XS-a:rhrnpsha

R

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INPUT DATA FOR THE HFLC5 SYS. RES. CALC.C NSISTS OF THE FOLLOWING DATA:T — TEMPERTURE DEG FE — PXPE ABSOLUTE ROUGHNESS (FT.)N — FXRST PIPE SEGMENT NUMBERN1 — LAST PIPE SEGMENT NUMBERQDES — DESIGN FLOW THRU PIPE SEGMENT (GPM)QMIN — MINIMUM FLOW THRU PIPE SEGMENT (GPM)QMAX — MAXIMUM FLOW THRU PIPE SEGMENT (GPM)QDELT — FLOW INCREMENT THRU PIPE SEGMENT (GPM)D — PIPE SEGMENT INTERNAL DXA. (XN.)L — PIPE SEGMENT LENGTH (FT.)K — PIPE SEGMENT K FACTORSL/D — PIPE SEGMENT L/D FACTORS

FOLLOWING IS YOUR INPUT DATAT E N Nl

212.00 .00015 1 1

QDES QMXN3000.00 3000.00

QMAX5000.00

QDELT D500.00 13.124

L170.35

K L/D. 50 465. 00

FOLLOWING IS HFLC5 RESULTS

ER TEMP. (F)SITY (LBM/CUFT)

VISCOSITY (LBM/SEC/FT)PIPE ABS ROUGHNESS(FT)

212.0059.74.190201E-03.150000E-03

PIPE SEG NOFLOW-GPM

3000.03500.04000.04500.05000.0

1VEL(FPS)

7.128.309.49

10.6711.86

PIPE DIA(XD-IN) = 13.124LHD(FT) KHD(FT) LDHD(FT)1.64 .39 4.902.22 .54 6. 632.88 .70 8.593.63 .89 10.844.47 1.09 13.34

TOT HD (FT)6.939.38

12.1715.3518.90

REYNOLDS NUMBER FRICTION FACTOR TABLEPIPE SEG DES. FLOW RE.NO. F-FACTOR

1 3000.0 2444029.0 .0134HEAD LOSS

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OG-90-44

August 2, 1990

To: Westinghouse Owners Group Primary RepresentativesOperations Subcommittee RepresentativesAnalysis Subcommittee Representatives

Subject: Westinghouse Owners GroupRHR Pum NPSM At Saturated Conditions

This letter is to notify all WOG utilities of a concern associated withperation of the RHR pump at mid-loop conditions that may apply at some plants.

When the plant is operating in the Residual Heat Removal (RHR) mode, the netpositive suction head (NPSH) for the RHR pump is calculated based on subcooledconditions in the Reactor Coolant System (RCS). Typically, a maximum RCS

temperature of 160 F is used to calculate the available NPSH for the RHR

pump. Since the Reactor Coolant Pump (RCP) is assumed to be operating abovethis temperature, the RCS will be pressurized to approximately 400 psig toensure proper RCP operating conditions and NPSH for the RHR pump is not aconcern.

Over the past several years, a significant amount of effort has been expended bythe utilities and Westinghouse to address NRC Generic Letters 87- 12, "Loss ofResidual Heat Removal (RHR) While the Reactor Coolant System (RCS) is PartiallyFilled" and 88-17, "Loss of Decay Heat Removal". In responding to the genericletters, it has become clear that under these conditions the RHR pump could beoperating in the RHR mode taking suction from the RCS hot leg at saturatedrather than subcooled conditions. In addition, the Westinghouse Owners Grouphas recently issued the Abnormal Response Guideline, ARG-1, "Loss of ResidualHeat Removal While Operating at Mid-Loop Conditions", which directs the operatorto run the RHR pump at saturated conditions if the RCS has heated up as a resultof losing RHR while at mid-loop.

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The available NPSH for the RHR pump will be much less at saturated RCS

conditions than subcooled conditions. A preliminary investigation of thissituation indicates that for some plants adequate NPSH may not be available atsaturated conditions in the RCS, especially at higher RHR pump flowrates. A

typical range of RHR pump flowrates is 500 gpm to 3,000 gpm. Based upon theresults of this preliminary review, each plant should perform an evaluation todetermine if adequate NPSH is available -to operate the RHR pump under saturatedconditions in the RCS, which could occur as a result of a loss of RHR event atmid-loop.

Should you have any questions concerning the above information, please contactRuss Oft at Westinghouse, 412-374-4465 or myself, 603-474-9574, X3347.

Very truly yours,

+EpML.A. Walsh, ChairmanOperations SubcommitteeWestinghouse Owners Group

LAW/RROft

cc: Steering CommitteeJ.B. George, TU ElectricC.K. HcCoy, Georgia PowerK.J. Yoytell

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NEk-6.4B" (9/50)NED CALCULATION

VERIFICATION CHECKLIST

Calculation I.D. No.:

Title: 8> H Cc ((ot'/

Authorized verifier: '.o-jI«» ~ seato1/

Calculation Preparer:

Date: ~(0/3o drDate: ~ ~ 4

The Authorized Verifier shall use this checklist to evaluate thecalculation against the following questions. A basis for theresponse to all questions (reference to a section of thecalculation or other, document) shall be'oted in the "Remarks"column as well as resolution of verifier's comments.

3.

4 ~

5.

6.

7.

8.

Are the assumption(s)reasonable?

Is the calculationdeemed acceptable?

Checked* : Remarks«

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