ML19225A486

RO 5-79-20/1P on 790621:reactor Removed from Svc Due to Loss of Condenser Vacuum Recombiner Sys.Primary Coolant Pressure Reduced.Caused by Introduction of non-condensible Gases W/Significant Fission Inventories Into Condenser

ML19225A486
Person / Time
Site:	Peach Bottom
Issue date:	06/22/1979
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 7907190406
Download: ML19225A486 (2)

Text

, . .

f PHILADELPHIA EtJCTRIC CWo WV $

Peach Bottom Ata= ic Power Station ~ L/

Delta. Pennsylvani.*

17314 June 21 1970 Mr. Boyce Fi. Crier .

Office n( Inspection and Enforcement .d g Region i Ik v>

Un.ita l Statea Nuclear Regulatory Covinission I/ '.* b 631 P3rk Avernee g *g King of Prussia,. PA 19406'

N f SURJECT: REFOUABLE OCCURF.ENCE - PPO"PT VITIFICATie's Q..'%f)b 4.

V i.

Confitising W. T. U11 rich 's converant ion wi th we.

United States Welear- Regulatory Cc=seission on 6/21/79. Cage. Region 4 , l 1,% p$@

'l

Reference:

Dochet No.50-27a Peach s'Lottose Unir 3 Technical Specificat torr.

Reference:

3.H.CI Repo rt No. 3L :n/to Occurrence (Mee: Jime 21,. 19""9 Tdentification of Occurrence:

On 6/21/'*9 at apprn v i =isit e 4 r 1 1 :05 ?.M the 8trri r 3 rea cto r == = r==wyv=d frc==

sereica .lue tn the Ic= = o f t he conden a e r . a ctn ser reco-shiner =ys tea Prboarv cootsne pra==ure was reefutedito opprowle=mtety 500 pg i st wh i l e recover'r creration=' w* ee. in progre*s,. Sesrtup checir il=r= we re enweiere<f mad rmJ w i thd ra ws ! was. i n i t i a t el .. R apa i r = we re si.ad e to the reen==h i n e r s ys te=s .

At app rv, w i == t e li 4:50 T54 starttsp operations 'eare initiate.1 tn **fshtish cnndenw e r va eutur cand i t i on= irt acen rd.ine- wi th cme rnfimmi r riire- new .

Tha s t a rrur vacw ra :- o'-v wa= meurted =r r8 is 'i==. Se 1. c. s :w es -,in o f f-g m e vruck rz.i t-s r in n '.an i t o r starte.] ro show an i n e re e w f. ret. =c vare.

The s t a rtu p v acm s- pe r-p w as shutdown' i -*liaralv. Win er eir rci s -

how-ver enne inned t r. i n : r* * " e . Thi* r-le=== c on e i m ***I av*e =rr ra v i e= r e l v 50 minnece The me s i -= r- releas, rot. ww= spprm i-9 f a ly : ne 1 o f T,chn s . 2 ;

Spaci ficsf inn I . i a i. f = , Tec h n i c a l 'sp ec i f i c.i t i ..n re l i e tie.*. w r. . . c c..; ed for ics< than 10 =,i e.o r e s durint ,bie t -in s e ,e ;in,iten.n...tv with ch ..

relente rha run e.- z e r n r huildir: ~wif venem ware c ' c a : i r- - ,e :n v a l rie af app ro x ima r c i v 11t of Technient %cc Miestson Irmi's Tb- m- w i- r sir-g a g emi, r.tcase e m e e- i,.= t h- re fn r# , m r.w i m. e - ? v iin nr eh. r,cnn.,a; trec i fi c a t i nn tinie pplisdnerv c=tinate- i n.I s ca r r rhar :nen i 1 ni civ -

I nobse ga-were relenced durin; rhis e ant Apparent (. at s g e o f Oc cu r n-

,e... r:

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m ,e . = . . , , , , , , ,,, .- ,h. ~ c~a 2 . ,,,,~~: ...c.- ,,,.... . , - . . . e.i no n . e nn. l en s i h i .- nees ith =i;ns*4 rant ff==*an proloer en-entar a= ic?n 'a=

e nnd en s e r . Tr:3 9 < fe r- Of the< i n.cr rf orv en r h e- ar .t t a sr s, 4 s n . > m :4 - c; c - a t r.

T* n 7""* 2 ! 9 f 3 '" f I Ip p'"el MI ! I" f' <- P1**I'Ieet! i f1 3 g A it c 7:3 9 "' e ) #' 4 e 5n e#fea 4 *- Of~ Ie* s' h .., ,y Spec. l i r- i r s .

7907196 }9"h 1 - ,

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Analysis of Occurrence:

7 s_ _ . _. _ _ _ . _ . . _ . . _ . .

The fission product gas ~ ~ s ferred from the ftw1 e le t < to the coa.len**r and then to the off-ga.s stack resaatted in a re l e = = fro = the plane in excess of Tech. Spac. va I nw s . The raica== was tar =inatt<I as saon == *n increase in radiation levels at the off-gas stack won i t o r w a s 1 3 *nr i fi + t .

Plant personnel did not receive any radiation eng m ura dog- b-e=u=* of this event No envirocoental impact is anticipated., Safety sicti ficance is ther= Fore mi nim a l .

Corrective Action:

Following the ir.itial high relenta rate, speciel pensisions wer* unde to provida dilution flow to th.. vacuann pwen du ri n g t h e w acu a t i m o f t he condenser mir < pace. Th is ev *nttwil ly p-rei t ted -a t *b t ! .'.in g 4 e mienser vacuum sufficient to p mit s cruen o f the uni t to <=rvice. No *<i li t i ona l releases in exces* of Tech. SpM.. liseits occurmi during the e mtenser evacuation op-ration.. -

P.wylous Failures:

None similar.

Very truly your.c, a

W. T. III 3 rich 9tperint mI*at

. Peach Nott<=i Arn==ic. P<wer St a t ion WTU:1jh ps'i _

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