ML18139A443

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Identifies Proposed Actions to Be Taken in Response to IE Bulletin 79-14, Seismic Analysis for As-Built Safety- Related Piping Sys. Screening Process Will Be Used for Tech Spec Sys to Identify Significantly Overstressed Supports
ML18139A443
Person / Time
Site: Surry 
Issue date: 07/08/1980
From: Spencer W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
591, IEB-79-14, NUDOCS 8007160664
Download: ML18139A443 (3)
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v1B.GINIA :E.LEC1*R10*.A.~>> PoWER COMPANY RIOHMOND,VIR_GINI*A 23261

.. : ** Ju1y -.a~ 1980 I

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I :

- Mr. Jam.es P. 0 'Reilly, *0_1rector _

Off ice of -Insp~cti on l1 E11f.or:ccrrient U. S. Nuclear Regulatory C01m1.f1sfon -.

. "-~

Ser1al No. S91 PSEi,CS/ CMR.1r :mac: wang

  • Region* It

- 101 Marie-tta-Str~et. Suite 31.00 At 1 ant a, Georgj a.

  • 30303 -

.1-".,*

Dear Mr. O'Reilly:

Docket. No. 50-281 *

~

  • l
  • LE.' BULLETIN 79-14 SYSTEMS OUTSIDE CONTAINMENT.

"SURRY POWER STATION UNIT 2

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rim purpose of. this -,etter is to ii:!entify. those actions \\'-!hich we propo*se *.

tc teke t1i th regard to -J.E *. Bulletin. 79- '.4 -upon.start-up of Surry Pm*1er.

Stf.ltion Un:it 2.

  • Our 'proposal: 5$- predica~ed _on prevfou~ pr_ecedents and *

. corrrni tm,mts set for Sl!rry an~ other* pc*.-:er stat forts under simi1 ar c1rcumst?.nc~se and we therefore consider our prop()Sa1 to** be consistent w1th ou_r m*ui:ual.concern for s*af~- operation of-the unit *.

  • Our request *for start~up of Unit 2 ~in* our 1 etter of f'ebrua-ry. 2-6. -*1~80 (Vepco Ser1 a~ *,.fo *. 1dt! )-* de 1 i neatcd Nh~t t*iork,,rould be c0mpfoted pi'lor* to
  • st?i.rt-up. - The work. th~t woul_d ~

be completed prior to start-up i<?e._s- _

i{~entifiect*as support ~na1ys-is anct*rnoct*ific"tfons on* I.E.Bulletin 79-14 *

  • systems 01Jtsi de containn,ent.* The 11 nes. for-tf:ese s.vsterns are i.r.1entif1 ed on the Surry Unit*-?. Q.I\\ Category I Pipe line Tabi'e. - Ana1ysis.~nd mo':!if1catfons will crmt*lnue on* these systeP.ts ba.sed-on, the fo1low1nq logic:

l..,:*_ A *,scr~ening _process_* wi Jl_ b-:-.used *for.. Tecrrn'.ical Spec1f.ic,rt1,on systems to identify signifJcantly overstressed supports_, for, \\'lhich immediate action,,,ili be taken.

The screening pro-cess w1 ll 1 nvo 1 ve two categories of ~tipports:

a.

The first* category consists of thos~ m0d~f1cation packages which Vepco *has received for the. identified* systems outside. the containment up to th';! time of start-up. The screening process for these supports will be completed within 30 days from the sf art-up date.

b; niose mo!'.fification packag~s which Vepco receives *after st~rt..:up Ao37 is the second c~tegory.

T!:P-screening process for-thi_s category of morfifi cation packag~s wi 11 in all c~sas take p lac~ within 30

~

days from the* receipt. of the modification packages from. V'!!pco* s

, /

Architect.-Engineers.

// 0

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e Pag~ 2

,~..

A siqn1f1ca11tly overst1~85'.Sf!~, gupport **rs def1ned to 'ie one t'.nt 'fails to h~ve a Factor of Safety _of at least. ;, with respect -to ultim'.'lte caoac1tv for the D0s1qn 9as1s Earthaua~e lo~<l* c~s~ ~n~* also excee~s the* crit~ri a in Su~secti on NF of ASME II.I~ Appendix F, Rules-for Evalu~tion of Faulted Cond1tiors. -

.

  • 3.

.For supports t!1at are sig111ficantly over-stressed*.as 1eflned hy the.

criteria* tn. item i..above, the applicable plant Ted1111cal Spec1fications will-he inv9ked to determine. opera~ility and reports will b";:' submitter! ~.s* required.

4_ *. Only *supports --that "re significantly overstressed,.* -as :~eflned above,

  • w1 l l be drs1_qnitPd o.S -nonccnf orm~nces.
5.

All mnd-ification pack,1ges for. supports will he issued by Vepco's

Architect-Enqineers i:tith1n 90,.i~ys of the ~nte af start up.

At'the conclusion of this 90 d~y.oeriod, Vepco* will p*rovide a completion.

. :date. for insta11~.tion of a*ll remaining mi,1ificatirns.

  • T!ie only ~xr.eptions ;to this logic anct *sch~dul~ *are portions** of the service

~1i.,ter system. \\:ontair.ing fiher qlrlss piping idr::11tifi~d* 1n cur letter.of Karch

_17, -1~80 (Serial *No.* 195)~

Ynur. approval for a separate *schedule on-t'1is

  • p1pirtq \\*zas gy*anted in. Mr. Charles. E. fl1_urphy's l'-'.ttel" of r,ay.~() 1 1980 (RII:RMC "0-280 ). *

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.*.tti*e completion of a.nalysis :of tt1e:*rema1ning ;sys:tems *(iutside the*

~onta1n~~nt f6r *1.E~ -B~ll~~in 79-14.whiJ~ the-unit is.ope~ational represents~

sign1.f1cant1y rP.duced rjsk to the* hea*lth. an(i snf~ty of the public.

Our.

conclusions are !1~5e,t*on* ~he _fo1l-c1wing. observ~.tions r~garding thi~ approach: _. *

  • J:. *. *Ail systems *wh1ch were or,1gina11y dynaw1ca11y anaiy;,ed* as* a. result of.

the March 13, JQ?Cl Orr!e-r to* Show Caus~*have now hern* re~rialyzed, both inside *~_rid outsi_de the contair.ment; anrf r~sulting.;mod if icat.i on-s* have been ir_sta11ed *. Comp1etion of this raana.1ys1s ~ssur-~s that the plant*

. can *attain zi hot standby condition -for all operating and.dr!s1qn coriditions. *rne S!-iow.t:1use O~der geri~ra11y af'fl}cted piping *gree.tiz!r

.than.6". in diameter *

.2.*

The_ I."E~* Bulletin* 79.-14 syste,,,s fo/ which reanalysis* js continuing

  • ... a.re outsi <le containment and* are ~ctessible for a11 *no'.!'nrnr operr!ting

.. conditions *. This ~i11 e~pedite installation for *requfred.

~ *:modif1cet1ons (nonconforman~es) and facilitat~ crjntinued: installatiorr of ot~er supports.

3.

All new supports and modified supports due to pipe*stress_reanal,vsi.s for I.E. Bulletin 7':'l-14 on Technical Specificiiticn systems outside c~ntainment will already he completed pr~or to start~up~

4-.

The I.E. Bulletin.79-1.4 s_yst.ems are g~nerall.Y 2 1/2 11 to 5n *dirun':.lter.

piping *. These systems ere cf less* saf~t.Y significance than tMe Show

-*.C:ause systems and therefore can be treatecl with a -g~n~ral ly r~duced s.t>ver1ty_ level~

Mr. Jemes P. O'Reilly P~ge 3 We believe our approach to d~tArmininq those supports with significantly ov0r5tr~ss~d condit1ons is 1n conformance-wit~ the criteria suggest~d in I.E.

Bull~t1n 79-14.

Th1s general Bpp~oach w~s also follo~ed for Show Cn~se systems wt-ii 1 e aria 1.vses cont i rnJ8c! on Sur.ry ~,ower Station Unit 1 a£ directed by the NRC Order of Augu~t '?~ 1'.:"\\79.

We ~1so i_p1(ie"'stari(I t.11at this approBoc!*, 'Nas

'!1so fo11owect under similar circumstances other uti1ities.

The precedents are nurnerbus, and the r~~scn1n9 presents a so11nd, respa~sible position toward r,ontinued safe oper,3tfon of the, unit with no significant risk t0 the hea1th-and safety of the oublic.

In.the past year and a half, Vepco has undertakAn and completed a very

~xter1sive re,ma1ysis effort 'fo'i" the Surry Pcv1c:~r St,1t'lon.

This ~ffort has resulted in an increast>d ccmfHence level of our pip'ln9. systems to perform t!'i~ir int011d?.0 functions.

The only area r~m.:i.foinq for*comp1et*ien is a portion crf the I.E.Bulletin 79-14 systems outsfde the containment, for a :5ma11er 5!:'.0pe and reduced signffican<:f' frrin the *original *scope of reana1yzinq an pipi.ng systems 2 1/2" di~meter and _gre_~t~r for both ins*icte and outside ttv:!

contai nm~nt.

Th0 approat:h nffere':I hi;rein tias l,een userl by Vepco and pth_ers to co~plete their ~nalysis and is expecte~ to-be satisfactory onrie again.

Ph_,,,,_se cont,,ct us if there are outstanding qL1estions on our proposa*1 *.

\\<Je respect.fully requr.st cnnfir;natinn.:.!s soon as possihlf.!-as Unit 2 is.presently sch\\~rlulei1 fo~ commercial cper'.'lti_on at :.he t~r1d of a*u1y.

Very tru you~s,

. ?(-

_ \\,J. C. SpP.ncer Vice Presid~nt - P~ier Station Engin~ering and Construction Seriices cc: Mr. Victor Stello, -Direr.tor Office of Inspection and.EnforcP-ment Mi". Harold R. Oe11~on. Director ~

O*ffke of Nuc1ear Re_actor*R8gv.1i!'.tion -

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