ML17174A157

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Requests Util Commitment to Comply W/Encl Interim Position Re Containment Purge & Vent Valve Operation,Pending Resolution of Isolation Valve Operability.Commitment Needed within 45 Days
ML17174A157
Person / Time
Site: Dresden 
Issue date: 10/23/1979
From: Reid R
Office of Nuclear Reactor Regulation
To: Peoples D
COMMONWEALTH EDISON CO.
References
TASK-06-04, TASK-6-4, TASK-RR NUDOCS 7911160569
Download: ML17174A157 (5)
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Docket No.60-23Z

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. Mr~ O. lpui s: Peoples.--...... '.... ~:.*. * ".... ( * *:,:

.::. Oct:z 3 _*7s7g ::>*...,_.. : "'

Di rector.. of Nuclear Licens1 rig,,.,,

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. Commonweal th 'Ed'i son "Compa!)y- '.

Post Offf~'e BOX* 767

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Chicago. Ill inciis 60690

Dear :

Mr. Peoples:~.. :.. *. "< * * * *, *

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RE:

  • Containment. Purging and Vent*1ng *D.u~i~~rNormal:. Operation

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' By letter dated-'. N~\\iembe.r ~9,.197~:--t~~ C~mflli ~s'fon:*-.(NRC) -~reqµested al 1

.11censees.of operating 'reactors. to. respond to generic concerns about contafoment purgfo~-or v.entit19,*:dur1ng normal pl~'11:*.operati~'1_~ The:,

gener1c concerns. were.t,wofQl d:... ".. < *

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Events had occu~red.where lfcensee~*o'v~r~ode or bypas_sed the.safety *

.actuatjon isolation.-sfgnals to the containment isol~1:iori.. v.J}lves.*. -

. These events.were. det.erin,ned *ta,* b~ '_abnonnal qccurrences a:nd reported

.to*co~gress.,in:January 1979.' *. *: 0;

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(2) ** Rece_nt 11cens1ng rev.fews iiav.e r¢qulroo: te~t*s ~or analyses 'to.show th~t. *

    • conta1nm_ent pufge or vent valve.s*would. shut w1thout*degrad~1ng con-...

tainment integrJty dur1ng th~ dynarrifo.*loads:of a*desigrrbas1s loss**.

of qool ar:it ~c:c'-i:dent :(DSA..,.LOCA).. >... * *

'* The. NRC p*~*sltion ~f 0

-the ~~*~~mb~r:.l97*S:.1-et~~r ;r~~~e§t:e~ that 1 icensees.

'.take-the *fol low1_ng posi"tive actions.Perid_ing *completion* of the NRC review: *

  • (1} prohibit *the override. or bypass of any. safety actua~ion signal l<Jh1ch would affect an()ther. safety *actuation: s1gnal; the NRC Office of.Inspection and Enforcement \\'JoUl~ veri.fy that ~dm1nistr~t1vti controls preve.nt improper
  • manual.defeat ofs~_fety.actuat1on.s1gnals, and {2J*c~ase :-purg1rig {or vent'ing-) -of containment o;r~.. l iroit purging *.(:or venting} to* an ab sol ate m1nfo;_i.im,. *not* to ex~eed.. 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br />. per ye4r *. : l4cens~es wer*e requested to. demons.trate _{!:>y.tes.t 9r by test, and analysis). tbat, containment.i 5ol at ion valves would* shut under:*.. postul ated 'DBA-LOCA:*c9i1dttio*n.

-The. NRC. pos1t ions were ampl 1fi ed by citation (~ind an -~ttacoe~, 'copy} of our Standard. Review. * "-

  • . P:ian: (SRP). 6.2~4.Revision* l and the. assocfated '.f3ranch Tectmjcal Position*:,
- CSB, *6-4~ wh1.ch haviieffectively_classed'the*,purge*and vent valvE?s as*

11 active~*:-'fovoking, ~h~ operability a_ssu.,rance program of.SRP 3.9!~*

,The N~C staff-has made site.v1sHs to several 'fac111ties. has met ~vi th

  • l iCer1sees at Bethesda, Maryland. *C!nd* h'as held tel econ c*onference~;-with.. :
  • man.father licensees and*met w1th some valve manufacturers *. *During these disc,iJssions, the* NRC staff has stressed :that *positive act1ons -m.ust b~ t.aken
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.in -th~ eyent -.of _,a DB. ~LOCA.

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~RCFORM.JIS(9-7.6).NRCQ11;240

.. ".*.. *.. ~~.S-~OVE;*~MENTPRINTING.~FF1CE:J97.g'2~9-369.

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OCT 23 1979

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--*As a res*u1t of -~hese ac.~1hn$;:we,f1av.e 1~arned fr()m sev.era1 ucens~es. *

    • that *at l,e(lst.~hree valve:_ vendors h_ave repQrt~d ttlat their-valves may.

_*.not close *against* the asQen~ing difte_rent1al presslJre and.* the resulting

.. dynamic "loading of the--design:basis LOC~.:.All fdentified.lic~nsees.

  • who:are affeet~d hav.e.>proposed;*to maintatn the.. valves.in the<cJos~.. *
  • - PoS1 tfort** or.to restr1c~.. the_ an$ulat, a*peJ.1fng J>.f the val\\ies whenev.er primary con.tainme_nt* 1ntegr-ity,is requ1red:'lintH.*a r~evaluat1on is :prQv1ded which*
  • s_hows *~a~1sfat::tory valve pe.f'formaiiee;uni:i~r ~he DBA-lOC~;condit_1Qn:.*.*:,...

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.: Re~ently, *a *report _under.* 10 *cFR P*art.Zl wa~* reeef.Veq by.the NRC from _,

the rnanu,fact~rer o,f. *b __ ut~~rflt v~J~ves* Whi<;h.~t-e.1nstal l~( 1n*.the_ pdmary.

conta1'nment at the Three:.M1Je Island* Uott 2.,:Nucl'ear S~at1on. These butterfly

.valves are *used for-purge a*nd ex~aµ_st purposes *and a_re requ1r~.to QPerate during accident.condftfo*ns.,.

The,,~rewrt* disc'osses the* use o.f :an unqual if1ed

. sol eno1d *vaJv~* for.a*~_saf.ety~relate<(val v,e' *f).1nc'i'ton \\<ih1ch "requ1 res,Qperation

. *u;1der ~c-1dent cond_~tio~~* The solenoi<! va1ve** 1s* used to pilot control, the pneurnat1c *valve_ -a.ctuators wt(ict.vare*insti'.lled on.the conta1nme-nt:

. vent1.lat1on butterf}y. valv-~s at-;this_f~cHtty.*. Yoci~-r~ev.aluatiorf_of

. valve* perfo.rmance;for*condttions*nQted*1*n _tbe p_rev1ous paragraph must.

consider t~e con:~~r!lS*-1dentl~~edJn.. J~_,Bll~,l:~ti~ )-9~01A. ".. *..... ~-

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A~ the NRC review p*~ogresses, *licensees wh~¢h mtght *have elec;tr1caf-..

override*cfrcuftry.. probJems.are. be1ng* advisea not~ to '.use the override ar:id to. t~ke compensatory f nter1m mea*sures* to minfmfz~* the pr.Qb lem. * *.'

In 1,1 ght of* ~he* ;~f~~~~i-~n* ga1~~d>~~~1n~: ~u> r~;~*ews -~;f:, y~ur*... submittal i " **

dated. January ~. 1979,*~~uly 2, '.-19.79*, :.July 5, 1979, July 30,* *1979 0 and Octot>er 4, 1979, arn:i -the *1ofonnat1on c1ted ab_ov.e, we bel 1,eve an interim. -

commitment from-.you.1s required at thfs. tirn~.* Th1_s* 1s the cas(:l,-even '

tl)ough yo.u may have propoSE!d T~*hnlcal Spec1f1~at**1on change's. or o~her

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. long.or short... term rne~sures; wh1ch. ~e ~re rey1¢wfng.-. For :your use *

... *we. have prov1ded as an* attachment *an in,terim NRC staff -pos~_:tfon *... * *.

In add1t1on, our-recently deyelqped. c'.tGaidel.in~s' for {)emon_stra"tton *Of Opera!JH Hy* ot.*Purg~ dand Vent._Valy.es*'~ *.wer*e.: prov.ided.. by_ -separate.letter*

to licensee$ of each... oper~ting reactor...

  • T~.i s 1 etter-* fn no.way relaxes**

an~ exist 1 ng Ue:e~~lng ;_~equ1 rernents _ ft)r. your fa.~ i111;y. *

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Because *~f _the Pote~i1al.adverse effec:ts on: the put> lie ;health *and safety whkh ~ould result frorn the postulated,. DSA~LOCA *whil ~ operating \\11th

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  • open purge or ve_*nt v~lves~.\\~- beti.eve\\your. prompt respoo~ ~ this letter*
  • 1 s required.

ln,: ~co.rd~nce* v11t~.10. CFR *50. 54(f), you are *re_quested

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NRC*FORM 318 (9*76) NRC_M 02.10

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  • Mr. o. Louis Peoples*.

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oci 2~ 1979 to. infonn us* 1n'wr1ting within 45 *days cif receipt of this letter of your comm1tment to operate inconforma_nce with.the enclosed 1nter.im-posi.tion and to*provid~.4s wHh information ~!hich demo.nstrates tha 0t

  • you hav~ initiated the purge* an~ vent valve o*perabil fty verification on an expedited bash.~ The-.*infonnatton provided in your response will enable us to *dete.rm1 ne _whether or* not your Hcense to operate Dresden Unit No. 2* should be _modified,.suspend~, or revoked.

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S1nc~re1y,.:...

. * -qrigin.al *signed by,

  • Dennis. L. Z.icmann:_

OenniscL~ Ziemann~ Chief

. Operctt tng Reactors Branch #2-. *

    • .Oi.vfs1on of Operating Reactors

Enclosure:

Inter1m Po.sit1on* ror Containment.

Purge and Vent Val ye-Operat1on

  • cc*:

w/enclosure See next page

~TION Local POR PRB #2 Reading..

NRR -Reading DLZiemann HSmith

.. SJNowicki

  • EAReeves
  • DELO JR Bue hana.n TERA GLainas ACRS (16)

DCrutchfield

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OFFICE,~.- o.q~_::q~~.J, _boR_:OR. -~ >>l1o9:R:'o.~~. W.?...... :"..... '_.... : :-..... **:. :*.. : _: __.......................

SU~NAME ~.. S.~~9~1#.li;.~b'.. EAR.E!e,Y.E!....... [OL.Z i ~!T!~!'l.1'1:;...... -.:......... *.;.. :.. :........................ :.... *...

-. DA!E~.~ 91-flX~~*__:_:.:. 1 O/!J~!U~~~~~~ !?~.~..... :....'.... **:............ ~-... :.. '..... :......... *...

  • NRC.-FORM 31!' !?*76) NRCf*,' J2-':

Mr~ D. Louis Peoples cc w/encl osure*:

Isham, Lincoln & Beale Counselors at Law One First National Plaza, Chicago, Illinois 60603 Mr. B. B. Stephenson Plant 5uperintendent 42nd Fl oar

  • Dresden ~uclear Power Station

.917 15th Street, N *. W.

Washington, D. C.

20005 U. S. Nuclear Regulatory Commission ATTN:

Jimmy L. Barker P. 0. Box 706.

Mdrris, Illinois 60~50 Susan N. Sekuler Assistant Attorney General Environmental Control Division TBS W. RaMdolph Street Suite 2315 Chicago, Illinois 60601 Morris Public Library 604 Liberty Street

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October 23, 1979

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'. *. :'*::*. ***INTERli~ POSITION FOR:-CONTAIN~1ENT PURGE.

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.: AND v£Nr :vAi.vE OPERATION *PEr~o1.NG

  • REs.owut1hN**.oF. isoLATION VALVE. oi>ERAsiurv *

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Once* the.concUtiens Hst~d be*1 ow are met *., restrict1c>-ns on use-of the containment

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. purge and V~rtt. Syste*m 1 solation val VeS wtll be revfsed base(f.on Otir: rev few

... of yo*ur* res:ponsEfS *to *the No,vemb~t l978'*Jet_te.r just i_fy1ng your. Pf!'.Opo*sed. *

,* ' operat 1o~ar mot;Je.. ' The' revfsed -~_estr,jctioQ_S~ c_an be *estabt i$Mtf ~epar:ately '

. *for each system:..

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Whcnev~r the. cont:a:1 nmerit *1 ntegr.~ ty fs.requi req*9 erriphas is should be *

.*. *pt aced on 9f>er~t1ng the containment*,io*.a.,pass1v~ m~e. *as *much as possible

. * *'ana on Jim~t*in9 al) pufg,1ng~;and.'.ven~.jr:ig t*imes~to *as low as actl1evable.

  • . To justify,vent ii'lg* or".purg1.ng*, the.r~ must be an es tab Hshed rieea *to

... 11J:iprove* ~v9rk1 og-.:cond1t1on$ to *t)e.rf9rill: ~:safety related: surv~1l1 ance -

. *br: safety _rerated,ma1n:ten.a~c-e:*proe.edur~~- ~'(e:~_amples of 1mprov.ed working*

  • . conai't; ions wo*al<V*iriclud~. deln~rt 109;:.reduc 1ng teim:>er~ture* t hum1dity111>,. *

. and a1rt>o~ne **acttv.ity *suff1C_ie.nt1y to, permit,eff1c 1~nt performance,

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  • or::to 5-19rilf{~an~ly *rec:tug*~ occupat'ion~r. ;rad'ia~.lcin exwsures) *. *aoQ

. 2; _:~a-in~~ii. th~.. ~:~~ta~~~r~:~t pu~~~-,-~;;~': ~en~.;:1,sol~t~~n *v_.al.ve~*: ~:1 ~sea. wil~ne~er.

  • * *the.re~ctor *ts:-.m~t *hi< the. cold shutd9\\in.. or
  • ref.l~elitjg *m~e unt1J
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c t1me as you ca1rshow, that:-:.

'~~:_.All ~hol~~:,.*~~ ~al.ves- ~r~ater.th~n* 3*J*~on1inal a1.amet~~: u~ed ;fo'r°

  • conta1n:ment *purge* :and venting :operations *µre opfirab le.under the
  • .*most ~evere' design basts acpldent flow. coilditionJoad1ng* and-can...
  • ** *. c-lose* 'tiJ'~ni'~ t;he tii*aa l 1mit stat.ed_ in* your Techri1caJ 'Specif1c.ations, d~s1gn*-eriter1~ or operating pr;ocedure§ *. The operabil Hy of butter.... *

.*.*.. _ flyv~lves.rnay, on an'inter1m.basiS,.be detnonstr:a~ed by 11mit1ng the'

. * *"valve to.be.no'*more :than.Jog to 50~-' open (90~. being ful 1 o*pen)..

The

.. *, maximwn opening*.shall be.determined. 1n cons.tiltcltion w.1th the valve

.*.-. supplJer. The valve oj,)e.ning must* be. sue~.that the *Critical valve

  • .*"µarts -~iU not be,.d~i.nag~ by' oaA-LOCA -loads and that ~the valv_e will
  • iend to* close-wt)en the.fl'u1d. dyn*amJc.* fore el) *are intrO:duced; and.

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MOd1f'lcat1ons**~.as tl~~ssary..' h.~ve* b.een mad~. to 'segregate :the conta.1nme.nt,

ventHat,fo*n* isolation s1gnals* to.~nsure that. *~rs a fn1n1mum, at le~st one of th~ *automatic safetJ 1 njeet'ion ac:iuatfon signals 1 s un1nhUHte4 and operable to 1nit1ate *valve closure when any other isolation signal may be _bJo~ke9::.:r;-eset,.*o'r-ov~rr1dden* *. **. * *.

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"* NRc FoRM.. 31a <9-'161 r.iRc1111 o24o

-~ -':,., *.u.s: GovE:aNMENT i>R1NT1NG oFF1.cE, 1979-289;359 *

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