ML19259C536

RO 2-79-24/10:control Rod Driveline Return Line Outside Containment Support.Seismic Support Calculations in Response Ot IE Bulletin 79-04 Indicate Support for Piping Unsatisfactory

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)

Text

/

muu%tv.

M o 'UC M

/Tkb Ihe / /CL

'y-SM.%

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-

@D

@'T P'

63I Farlo Avenue 1 1 f

ring of Prussia. PA 19406-d J

E Li 6

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.. -

.,;c. m. 7906270Ckh.

S

~"

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,,

h*?h/

YY.

W.. T tit'Prichy Supenintrendent -

Peacht BottoniAronicE4mer Statiem-hTU::1)ht OO' 9

a

~

. o ;,..

g i.

d w JU

. J.J

. J

-3

~

.c

^ ' ~ ~

+. '........

-.. - ~

..~ ~~'

- ~

~

..: - ~ ' -- - -

-. - ~

.