ML19225A456

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RO 5-79-19/1P on 790621:anchor Associated W/Reactor Core Isolation Cooling Piping Had Two Bolts That Could Not Be Torqued.Caused by Improper Installation of Wall Anchor Bolts.Anchors Replaced
ML19225A456
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 06/22/1979
From: Ullrich W
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-5-79-19-1P, NUDOCS 7907190367
Download: ML19225A456 (2)


Text

e Pist1JaliiLPl!! A ELECTRIC 'CCHPANY E.caen Duttom Art.an c Poa-or . Station D elt.a. Pennsylvania 17314 June 22. 1979 Mr. Duyc e 14. Lcier Office of Inspection and Enforconscent t%cgion i United M ates Nuclear degulat sry .Constission n 31 t'aa L Aw criue ida g of Pru a t a , PA 19406 NJtuECT: ,H1fytALTA'st.E (40)H RiddCE - PFL*.Pr MJrIFICATI(N Confirating av. T. U11 rich 's conversation with Mr. Creen: san, Region 1, UnAted St. tem iclea r .4cgu14 tory Cceamassion on 6/21/79.

h ference: Occhet No. 50-275 Peae:1 150tt oct Unit 3 Ts eenn ical Spectiteation Refe rence: 6. 9. 2. a (.9)

Repo rt 'en . 3-79-19/IP Occurrence Date: Jiato 21, 1979 g % {r w

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ident.ifAcat ton or . Occurrence:

As part o f t he seGmac .upport inspecti'on pcogram requ1Yed by IE Bul~1.:cin 79-02, mia anchor associated with the RCIC paping uds found to have two bo-its n.hich could not be pra.,ye rly t oragued. An Engineering .atalys.ls =45 performed and a detersanat sco ad41e th er, in the As found . condition, the 1 anchor would not t>c capable or =athatenling 4 comban4 tion of operac2ng and seismie loads 6.ithout o ve r sr t.c a m ing, the.uther anchor bolt.s.

1otlo ing the ident ificist ion of the two loos e conc ret e insens, Bechtel Cocporatii analyzed th23 s upport in order to deteninne tra load carrying cath bility. This mswalysis cunc luded that. wi.ta all si A bolts in place, t wo bolts have a sa fet y Sctor of 1.5 .nd two b.e l t > h w e a > a fet y t.ac t o r o f 5 . ti , bas ed on m anuf,.ct u r et ' s pubi t s n ed .ultaa r.e load. ;

A3, ipa rcht C use of -tk.:cua.r ence: .. -

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-l=prope r in s t al l at z un ur waL1 anchor tolt.s. ~

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,Aasm i p t s ut tR e u r s e ra c e ;

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J.e r e , the .acliar pl te insp ction pr s esr ha6 cump let ed .t ? an cho r pl.s t e lutettuns. A ti t s i s t he un ty i d en t i f ie d .e nt.ho r s up p.s ai f.s i l ti re to des t e . The co -s i n d e r e> f ( !i a* #CIC wall asichurs h.s v e teen. tound to be a c c ept a ble . 'i he as lu st .a l l es! .aic hu r pl a t e da m s h .e sufttclent in..4 c*grying , spa c it y with all s' e mpe as t e f t

  • s ja g ss uc t'If 18131 a l icd T u t j t ha)( .ind T he olW! r It $ 1sg .19d ,ie L 2s bt I t* lo.A aI3 applied rec.use o r c h ,- lu= ps obabilit y o f .s s ci-a u A c cw ent , this d e fc(.c h a.s sm ? n i aw 1 3.a!ct f 314, t:111 am o.

79071 90367 326 E

3- 79-M /P

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G m cive Action:

The de fect i v e ~ wa l l. an cho rs h tve h++w mved an d v7 .s1 c ed w i t h new wchors.

This retums the support to its original capabiIity.

Whm the wall anchor miesign i s etmp i st ad hv **c h+ = t . W i fi r = r i en s will h-ande to increase the load carrying capability to provide the de.ign rmpi "

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bolt safety factor. .

Previons F3iluras : .

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