ML19305A766

RO 3-80-7/1P:on 800221,seismic Nitrogen Supply to Five Containment Ventilation Valves Found Valved Out of Svc. Caused by Possible Lack of Info During 800205 Inerting Operation & 800220 Blocking Error During Mod Work

ML19305A766
Person / Time
Site:	Peach Bottom
Issue date:	02/22/1980
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
References
NUDOCS 8002270309
Download: ML19305A766 (2)

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'Hf f AN.Y. PHI A 3'iCCT3t ti' CottP Af(Y Feweh sart e Ate Ic Pawer Station DeIt:e. P-annyIv,n h .

17311 Febnsary 22, 1980 . I

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< f Inspectico and Enforcament Of't.ca i a*ubm. 1 _-

siteclear Regislutary Comission 7 N ewt states .

t 4.11 Park Avenur 10406 tint of Pnsasia, P4 "-

• • 09E'T NOTIFICATtCN '

l 51mJECT: REPORTABt.E OCCURRENCE l V. T. Il11 rich's etwsversat ten with1940. Mr. firaensman,13.5. Nuc ear .-

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<>n f1 minst

%gistet.ory Cm==is sim , Regten I en February 21,

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ceference: Oncket No. 5ft.279 T Pe=c81 Mtt w unit '! 6. 9. 2. a (6) .i 1 Tectwsics1 . Spec i fic at irm Reference : .

M-yort Mo. 3.ag-7/IP 71. 1990 r-Occurrenc, Pete: Fahrtenry  : .3 Identifiestien of Occurrence _: {

seismic air supply to five containment ventitation valves volved euc .

af s rvice. E f-Apparent Cause of Occiscrence:

procedurst and operator error.

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Anntrsis of Occurrence: backupp seismically- y threiner a emittne inspection of plant equipent, the I tion he==ver, were j ,

gastified,bott. led nitresen vyp1y to fletve eontaionmt The vaiv-s vesitx =

nd werg,ther=(ove, t

l volv=s was foned te be volved esat of serv e . l 7 y>

heing supplied frw the normel instrinnent air supp y aThe nersel instriunmt sie supp completely operable. j' If a selwte event ocentrednvolved whichcmeld e*7ntted in fat havn permitted t* r, of the '

qaneli f ted. tha five valven i t instrio W . sirlesysteet, kare aft =r so=e time latervat if correctiv, action was i no d ,

egeteine m.t If a ealmete mt had ocetrered, the valves decreased woestd have rwen ne takest. to about

' tite required seated for abowt 24 ho.ses. If the disc s==L pressure 52 psig, en ledicating 1.t she in the control roa=this identi.fr wowtd condition show that.

ance-per-shift pawnet chack by the operator wm:14b t h d prior to less of and the **immic *ir supply would cbe re-este i s e hevw r***elted in leas of conteinment Amrastrity. This e mne* eettid rs occurred and if

• stuisced seismic '

cesstata==nt integeity enly if addifica=1 orarster erroadonai i

C4=et. ,

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800227o 6 0 9.

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. s Corr-etive Action:

When tb- First se t.m le,lly 'pst: 81flad batt imi backtip sirpply was i den t i ficit ,

nu investination into *.hst enu*e and an inapactiim of all containment vantilstien vnivaa v eta im= diataly initiesta,l. This inspection i<len t t fled  ;

the co 'te other battled surpi.le9 which wara vntved out of *ervice.  !

Pr-11minnry invetig= tion indientes that thesa bottles Wre l valved ant of re- eice en February 5; 19810 when tha etmeriinment VGntiitttien valves were set up for inerting of the containment prior to reactor startty.

The containnent vantilatien valva eparators and si.r mgply systems are being m lified to qualify the-t for operation ditring salmic avents.

See of the y=Iv-s have bean nimlified and others have not baen nodified.

Those valvas which are nat 'wodified have a nitroen bottia supply to the valve disc sael which is manually actumted following the positioning of tha volve in a closeil pas ttion. In order to opan these uneodt. fled vaivae, an acentar ==ts t VMlve out the str supply to the disc sam t prior to <merattne the valva fram tlie control ruim. It is pos=ibia that3 due to lack of overstor infamestion. in operator vatved out tha bott1=d mir supply en t!m five valves twtiaving they wera me yat not modified.

These five valves, Sewever, bed haen modified. Th9 whift that comoteted the inerting operntion on Fabruary 6. t#80,therefore ,Enited to restare the sai smic air supply bacouse they were not swere it had been valved out-ef service.

The inspection of the Unit 3 centnipaent ventilation valves also identifted a recent blocking nrrer. . At approximataly 2:20 AM on February 20 1980.

ventilation valve A9. 3512 was blocked for modification work. The operator cyplying the permit incorrectly velved ont the disc sesi sit supply to A0 3511 as wel.1 me AO 3512. At the time the inspection was made, the disc *ast prea*'tre on these valves ves 15 psig and 55 psia. Normai semi pr ,asure is.. granter than 75 psig. This crnaditten was immediately corrected. Leak tests performed to detemine the seal citpebility of these valves at the lower disc sealing pressure . indicated leakage we,Il be.Iow the . acceptable Iey,1.

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Tha inspectI'm of all other Wit 2 =nd thsit 3 contaim=ent vent 11= tion volves did not identify any other deficiencies. . The deficiencies discuesed above were imedintely corrected. ,

Tho investientinn of this occurr-nce ir continuing. Preliminary investigation indientes that. a6Litionel corractive action is required ist the area of erriipment identification, edification information transfer ,

a to the operations group, and procedural improvements.

Previous Failures: * ~

Mnne.

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Very' tru1( yours, u

/h$

4 T. tilt rich

- Station Superintendent WTil:1hd 8

J 9 49 8

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