ML19259C536
| ML19259C536 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/17/1979 |
| From: | Ulrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7906270064 | |
| Download: ML19259C536 (2) | |
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PHILADELPHI A ELECTRIC COMPAW, Peach.Borroer Atwie Power Station-Delta, Pennsylvenim 17514 May 17, 1979L Mr. Boyce II. Crier Office of Inspection: and Enforcement D h @ M<
Region I.
bbI United. Staret Nuclear Regulatory Commission-
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63I Farlo Avenue 1 1 f
ring of Prussia. PA 19406-d J
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SUILIECT':
REPORTfMI'E OCCURRENCE.- PRO W hUTIFICATION.:
Confirainc W.. T. If11 rich's conversation: vi th Mr.. Greenman, Region.1,.
United States Nuclene Regulatory Commission: on 5/17/79'.
Reference:
. Docket No. 50-277 and 50-27%
Peach Pottose Units-I and: 3 Technicat Spectfication.
Reference:
- 6.9,2.a(97 Report No.. 2-79'-24/ IP occurrence Date-5 tay 17, 1979 Identificacion of Occurrencee CRD return line. outside of contaimment support does not. seer seismic requirements.
Condi*tions P'tior te Occurrence:-
Unir. 2. shutdown. fore maintwnance curage.-
Unit 3 operating at approminatwly 901. power Apparent Cause of' Occurrencec Seismic support. 21culations. tw response to t.E'. BuHetini 79-04t have indicated. that the support for the outboard CRD piping, is. unsatisfactory
_Aneiysis. oF occurrencet The-contml. rod de:ive systm has. been'. operatet at Peach Ebetoes wi.th the returrr line to the reactor / isolsted' for the lass: 2. operating: cycles.. CRD-systeur is ful:Iy operativn=4 En this ante of operatfors The line irr question; is. therefore inscrive.
Calculationw have detenmined that the CRD recurrs line piptng betweeni the coneni.reent sheII and..the" reactor.vessrF. is property supporteli.:. This p'epimg contains a cherir valve wh4che 11r: closed:,in the pressnet mode cfrc.operneterr,.. Thk check..v.s4ve a= *<etI! as-the outer check valve wasr sattsfactor.i f y ter.k rested durimg the nose recent refu' eling outage:
Since-this inner.va.1.v.c. i s leak tightwe is presentlyr ciesA and is: Iocated int pipst:gr which: is seisai;cally quali.fi~cd,. the inadequate setswic supporr ofi the piping.-
and, check vaixe outside of contusnmenr. has. minimal safety signif1'cance.. -
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i v 7ec w ce Corrective.Actiun.:
The Philadelphi m ETeerric Company ** responser to T.E. Buttettu 79-04:
dated S/1/79 Indiented that: if the scismie ana,1ysis of the outboarda-CRD piping imlicatal modi.ficaciant were requirred',. these moJEfications would be coep14ted in an. expeditious manner.
The Philadelphira. Elee.tric Company's ArchsteeJrucak Engineer-is: present2.y desisgning addi,Moruck supports for-the outbvanli CRD piping..
The design. for-these. additional supports ie expect's d! em be cosphredi for Utsit 2' on 5/21'. and'. for Unirs. 3 on.5/23 These suppores will be instartled, as, rapid 2gr as possiMe oncw ther design, is availa'o4e Previous. Fai,Iures:.
N/'A.
Very tru5y yours,,
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W.. T tit'Prichy Supenintrendent -
Peacht BottoniAronicE4mer Statiem-hTU::1)ht OO' 9
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