TNNESSEE VALLEY AUTHORIT- s

CHATTANOOGA. TENESSEE 37401

aM0 amto . t mrset Tamr Ij '.'

Spteber 15, 983 I 83

U1 1/892-58

VS. aeaw fgwiatory es

A, tt . Jms P. O~trIly, egml A~onr trator 101 Ihristta Steet, I, kite 290 ttlta, Georia 30303

Dowr r. Ol*tlly:

aiTIS IU mrI PLalr S 1rT 1 MD 2 - CK rn sMma an nR NDG vIzatus - SonM-3901g/82-58, mU/-39182-5 -5 F IlL aMr

The mubjt deflor my us inittally reported to WC-O Inlpeotor D. Qdok on Mr 26, 1982 it iasoe• ae with 10 Cr1 50.55(e) as We 4068O 1. Itaria reports are dubtted on Jue 241 ad October 26, 1982 aad F•brury 3 ad Jome 24, 1983. aftlomd t our final rport.

If yau thao ea Wy qisti , ptle •t la tomob with I. R. Sbll at

Very truly your,

TEMMwES VALLEY AUTOWRITY

L. I M1l1, Ibu r Xbolear -rdwe

Ost W. lie ard C. TouMn, Diretor (Baolomwe) Offite of lmapetiot ad hftbremat U.S. Imelear reistary CoI• i•I hl*aitoea, D.C. 2055

eMoa• Ceter (eroImse) Iansite of lmslear rowr Opeatio 1100 Cirole 75 Parkty, Suite 1500 Ataitog, Gboria 30339

193-TVA ~ SOT ANNIVERSARY An Equal Opportunity Employor

1----------A

*li0V BAR W aLZA PUAT oaIT 1 AND 2 CMCHIRV ANCDRAGPRt •MD Ob VIOLATIKD

Ica 4068f It 1-50*.390/862-58, UBD-60-39t/82-55

10 CFR 5o.55(e) FI.L MNPOrY

aesaription or Dmfoieney

Toe Sbject defieciany involves apanioan bolt anhors fr supports of varfiou sstaum having baen instaled too eloge to oncrete fkr* edges. Thes bolt makors are attahed to oad bearing msl and are, in som Instaces, instlled in grout nstead of oonrete. (Qout has little or no rsistance to mohor pullout. Other bolt anchors are nstalled in these wlls with less than ten nomine bolt diamters ftvo the cocrete edge. This violates the requiirtmnt of TWA Constrution Specification a-32 hieh speales a minima distance of ten nomnal bolt diaters unless otherwise approved by th dign engineer. The tenion and shear capacities of bolt amhors can be signifantly reduced wben anchors are Installed near cnrate free edges.

Thbe' are sevral umls in the axiliary building and cotrol building cieh contain ureanfocd constrution joints and/or gap as part of their design. '"w discontinuities are not alas readily apparent. They uat, heaver, be omsidered fre edges for the purpose of bolt anchr nstallation. Thy occur ainly in nnled bearing (partition and hield)

Wsls and fall into to catagoris-hrwigontl and vertlcal.

The ahorsIatal gape oour aMre partition and &.ald walls intersect the celng.* Them alls W're desgned with a to-ach i pace at the top so that the estlin above will • ot bear directly upon them. The ta-inch gp is abaured by a narrow srtar joint hbich ms placed to prevent air flow. Sina te srtar Joint is not designed to tranmit load, the joint mst be ae dered a frwh edg. This elramtance oc ur. on all ShielA and patition alls in the acotrol and axliay buildings. Specifically these

abw up on the frour g emoerete drawin series: 411366, 36, 370, 372, 373, and 391 in the mxiiary building asd 4118M3 in the control building.

The unrMal f 1 ed vertical construction joints ocur where partition and shield alls interseat colums or strutural walls. Thea oircntanres oaar in the sr molaed bearng alls desribed above and are Mro on the am drawing series listed above.

The periter lalls of them buildings as wll as the *C3' and Cll" walls in the oontrol building; the AS," 'All,' Ou," "I, and "" in the m luary bilding and arious other structural wulls ar not subject to thMi problem.

The apparnt cause of this deflciec is that free edges wre not diteernible at the tim of installation and inspection of the bolt anchors.

SSinm bolt anbhoer are installed in violation of G-32's edge distane S requiraemta, the manora my pull out of the concrete before remacing the

loads for bih the system is designed to awry. This oandition could amae the support to ftil and thus failure of a safty-related system.

Corrective Action

waluatijns have been perfbr d ad completed ob the edge distance violations for the bolts that wre identified froa the field survey. One mhnred and nineteen spports require sm type of re.ork out of a total amber of 477 supports that were identified as having ao dge distance violation. The follouag guidelines were used in arriving at the nuber to be reorced.

1. No bolt achors with edge distances lea than three ominal bolt diameters fra the conrete edge, Including those Installed a r joint will be accepted. (Although 0-32 does require ten noanal bolt diaeters for a minian distance, less my be accepted if first approd by the design engineer. owever, never lem than three diamters my be accepted.)

2. Accept no plates that bridge or span across a joint.

3. Maintain a ftator of safety of at least five when evaluating tensimonshear capacities of anchors near Joints.

inety-nine supports require som type of redesign and/or reork by TWA's Division of Construction (CON01 ) to alleviate the 0-32 violations. The resminng 20 supports will be revisd and issued on TA's Division of ogineering6 esign (B DS) draringo. Unit 1 design =r will be performd

under engineering ohange notice (ECU) 3786 and unit 2 wor will be performed auner •Ec 3853.

A emoraindn as written by the Iatte Bar Construction lhainese on August 10, 1982, to all upervisors in COST who are responsible for the installation an inspeotion of bolt anchors to infom and advise thm of the problem amoiated with the subject deiincy. Th supervisors have been kept ontiumally informd of this situation since the morandu released by ommnts made in mekly supervisors' meting at the latts Bar site. norewer, another ammradum Ms written and released on May 16, 1983, to further instruct the responsible supervisors in COM to prevent recurrence of this situation. These amerandusi identified assigable ame of the defiiency, noted draiags on which the condition occurs, outlined areas where the proble will not occur, and detailed how the proble ares can be idetified by Ioser visual examination.

All DM enginers who have reponsibility for support plate attahaents have baen informd and are now aware of the problem associated with those noonformnoces.

All 5 DM drwings associated with free edge violations for unit I are scheduled to be issued and corresponding work by COIS completed on or before Deoembe 30, 1983. I Di drawings for unit 2 ae scheduled to be issued by Nay 30, 1994, and ooepletion of unit 2 COWS work by October 1, 1984.