ML20126B175

RO 2-80-3/1P:on 800119,Units 2 & 3 of Offgas Radiation Monitoring Sys Were Determined out-of-svc Due to Low Radiation Monitor Readings.Caused by Plugging of Gas Metering Flow Control Valve at Unit 3 & by Operator Error

ML20126B175
Person / Time
Site:	Peach Bottom
Issue date:	01/21/1980
From:	Ulrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
References
NUDOCS 8003060498
Download: ML20126B175 (2)

Text

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O f fi ce of Region 1 Ins pe c t i on a nd Tn forc e rc u t '

United Stntes 631 Park AvenueNuc ic a r ne gul a t o ry Co mmi n n.t on King of Prunnia, PA 19406

SUBJECT:

REPO?.TADLE OCCUnnENCE '-- PROMPT NOTIFICATIOHh

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Confjrming'W. '^

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. Re p;5 nn 1 T. St 'U]1 3 United ater1nchNucinne 'n eon ve r9 nt 3 on w 1 t h Mr; n rw ennrin', . -

Re srulatory Commi nn ion on

- 1/19/80 and 1/20/80.- ,.

Ra re rence:

Dock-t No. 50-277/278 Pa n c h Pot, tom Un i t s 2 a nd 3.

Technical Speci fica tion Re ference :

3.2.D,.1.(c) no po rt No. 2-80-3/IP ~

Occurrene. Date: January 19, .1980 p.y m ..

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gdentification ~ of Oc,oterrence rqi:

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ESn 1/19/80 'nt approx tnat ely- 9 :50 PM the Un j ti 37 o rr-y:nn ra cti s t i on ' ~

~iio ni t o ri nte, i nya t e m . (b ot h ev> n t t'o t m )

service ban'ad on inw radi nt inn ren t f o r re nt dai rr Unit wkn de ine rt to tia n u t, of n gn . At t hin tima 3 wa s in a ntertup.nt ab nut 00% power. Unit ? o ff-gns rArti nt ion ront tor.t ng n ys ten van t 10: 45 PM on 1/19/00 ft nlno chrvekort un't nt n e p r^ st i ma t a l y thin t, t m e Un i t 2 was nIno was in dentnatnrntrt nad up attoabout be n 30% ot o fpearvica. o we r . At

_Appa re n t Coune _of Occurrencr= :'

.Tha Unit 3'n(f-rns d on tn plurnge in thermi t 4 t.! nn mnn i t ori n e o v -t m r*n n notertr" c1 "w wmn out OP r. a r v i c e

<nn+roi eila, ';

cte,':>n t rol n 1f.n ri n valva F, wms bvon"nad nn1 t h e- Un1+ Tble f* ytt i e rn wn e no t u rriati tn 1 o r r re r v ' i n t .1 on (with$ n 10 minutes o f d i n c o ve ry ) , s. rvi r e bv iO:00 PM on 1/10/80

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The Uni t 7 o f f-ga n cr4 d i n t. t on te n i t o r t w nyateri v e 6ut o r ' o., r vi c e P

• due to on operat.or e rro r, in which tha wrong v n i ve wns clonad, This removed the o f f-gan end i n t i on moo t t or t nr. n y s t.a m f rom n e r v.t ce . . Th i ei v81 vin g e rro r was co rrqc ted and the nynten wnn

)* re turned to ' narvj ce ' at 11: 4 PM on J / l') /00 g Antslynin of Occurrence De ca nn e the o r f-r,s, rnal n t.1 on mni to ri ng n ys te n doan not p ro vide a tr.1p functton wIth tbe o f T ,i;n n roc omb t ne' r n y 4 e n .i n n ar vi ce and N beenune both unita vare o pe ra t I ng w.l t.h t b aa t r re coph inc e s ynt ons in nervice , there enn no dec enne in pir.nt. prote ct ion due to thle occ urre nc e ,

g Th e o T f-gn a ra d1 nt. t on teni t o re p ro vido 'nl y op+ ent j on 91 dnt6.

, The afflunnt from the o ff-gas rec ombine ' sy nte n i n moottored by the mnin off-gns stack radiation monitorn 'which were orcrationsil during thi s occu rrence . , Thara fo re , th e s e ~ n.o ni t o rs be i ng out of g service for a abort time has minimal sn rety signi fiesence.

Corrective Ac tion: -

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Doth o fr-gns rndintion monJtoringiny atems ware _ returrmd 7t o, nervice. shortly rn) 3 owing:. di enovery.4 An invent 3 gat ionio r enuses -

3 contJnmn. Addi tional 'corrart-t ve Lac tion' mny be tsken. upon~ -

corolotion o f thin investigntion.- -

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g Prevlous, Pailurast None nimilar. ,

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Ve rv truly vou ra .

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7"- W. T. UlIrich Station Super.intendent i

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