ML19263D385
| ML19263D385 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 03/05/1979 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7903290125 | |
| Download: ML19263D385 (2) | |
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" reich pn.en..at.-Ic N et..Statif7n g)
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Delt1, re lit *
- IVibit I '.1 l.4
- istch 5 1979 r ier
- tr. nnver II.
ar
- 1ffice nf in<rectica el E.nf3rce-pet Reginn I fin i t e f 4tstes
'h er-l e.i r Ur ge n l a t n rv Frw-i S t i en s
615I Park Avenup Ut og o f Pring s i n PA 19:06 Sill (fiff-HLP9D TM LI: MOIDPI NCF. raiverT *ntIr IC4 It N Confi m i.7 g St. T I'l l r i ch * = cn.rce e-:Selon w i t h "-. i r ee n-a n.=na "r.
N f:nt'e,
p e2 i ort 1. Ifnited Nf,te.
Nu; tear Pegritstory C - l=rirm on.*,/1/ 7 0 Deferaar e :
twcLet No
". 0.' * * / 2 84 re :it h no t t - tin i t. ; an1 1 Techni nt.Specificitinn Acfcrerce:
('.4.2.pf9) p ern rt No.
'0 - 1 I.' 1 r Orceirresc 16' c :
$84r ch T, IFO -
~1 dent i f ic1t in-o f t'n u r r. n[c :
ingineering revicu
.'.'.r rived
,8 e-i r e 1.!crictever in c r ne s i n.-en t vent ilatinn tvetea isniat(On vglvec, Thr slefi'4encicu talent i fiel are ne followe-A =tudy perforac1 hv the v a l '. r -inufa<;teret les e ind icat ed t hat the IR" f o n t a t nr= r ti f f4nI9P tson s an I s e *
- t
- 4 " C 3 p t ~ 3 wi'h the y e q t I I m i i <w-
- tm t w wilI ri n t c)nse when = ub i ec t. il fn p<*w t I K S comd i e n n,.
r'n = t - li f C % cnrwlitinn" Arc <Irfi'T*I in I C AI? in TigM'e I.I, (. l f8 The limit ing stre==
wpu (d ent i ( 4 cg!
in the a t cr-in n i e n p re e '/ t i n it, p i t* *- re f the vait.ce.
r eli=tngrs calcotistinne e
i n.f i c :s t e eh e
- be v,. i s e s ill clnse vinder pa a t f W r<vnli t i rms i f *h valvc=
pre lest thin 10' npen, The enhiec* vnIvet 8: :r g e Is
- e n gei<=ies}Ib m els 1 v ' ej,
Th e-v :n ! */
- bes j v,
a n al ny e r;s r
.t
-eet
-be e r t a a l i. r e su i r -e-'t a.
Nf dit t ena11+ the flew f en t en t v,114 r ra '* f the t -'I c'*<eist yn j s e rt4 tor"aSteI with the enn?rnI e y g f esa are qual { f e e,l.
Other renining rOF' tp**
"f t 't e c Cri' r v l c y *t t e=y have etet heeft Ani4 a V ~ ft$ [nr 4eI49"ic 8'e I P'lll '% C ).
Appitent f:$uwe of n or-an e*
link nirwn An a ly t i s' of Occurrence:
The encen++'<a'
,ecti'atinn isnia'i - s a ls r e are
'm
- r-i ! 9 v==ic'nineI in a rintel [t<v e s t i son alq r i r' u r* ow e r repe r g t inn.
The., vf [ t.
e nye
,,n g, opened t ti i n ert au f oc. int rt the, o -+,
- -ria ti i-ig '. t.n r res;-
.a n f im' prin-t-
b u t.l * *w n.
The probability o f ** 18 C " nc ri p r r i e;- detrint thesc ah irt t i me e i n t e rv a l s is c e1n 't i d e re f fa t 't i '* 4 I 79032901a5 S
.s.
u o GM
'w' t,,.
/
Cerrectisc Action-th. =nt.icct vals cs b,vc beer hind e ! in a cloecd pa=itien, ifnle==
.peciric,lsy authort eI hv 'he 'tstion "uperi r't e n t en t th-we volvc= will be asint.ine1 in n rio=ed p-=
tion wh-n 're r*t i ne condi t inna are auch lorA cent.1 necur.
The t', tion 49perintendent rav 'in t ha r i r e partini that a erening fle== th'n io') nr these valvc= in order to
-si nt ra in nrygen cencent rat ion = in ennt nin-ent le== than 45.
fin 1/V70 nn in pect inn nr nI I afrectr,1 IR" cantalvacnt ventiIntion (selatinn valves n=
well ne nthar --wf)er veelve= nf einilar dewign was made.
In=rection= w = re perforreI by a rcpr**cetative of PrCn, Nec h an i c a l rngineering Di v i s i n't sin,f armbe r e n( the = it e Fngineering Croup.
Ymive support.
were found t o be property i n = f
- I l ett.
16nw e v e r, am a re stil t of t hi= inspection.
threr valyce..V 3 7 7, I n (tfale 1 r" nitrogen ielet en (Ir vw e l l nr t o ri s e ), AO 3519 (s en i t t v." nirmr.en infer to ettvwell nr t o r's = 1 m n.! M1 V.0 ' (ifn i t 3 IR" c = h siv a t f' r n - el ryw e l l in a t e n l'.y ga= t r e =' a-nf n s t !'t** r I 1*ntation valve) were fn e n f w i t h their inflat,bic
=c,1 ine infl at a l.
Ofiustaen't were i sowsed i a t el y r= rid e to the acr+sse ing hnI= which nrarnte= *be 2-wnv geal ch,-b r pre==isriting valve.
This en,rg::*-1 the int le rble = cal art <! ret ea rned t he valve to a fail l y ope r.1% ion a l c itos e,I pa'i s t ion.
4 long t e rt-corrective ar'ifni will i *vnt s e anelv-is o f t h-i n e r, I l eri P cont rvel =vatte to s e r i ft cei-aic stereptability.
64ec fin n e r :i l T.n g i n ee r in g belirte= that the as l e t r a l.f c.I ew r i r -* n t will ecat tha s e i=== i c r eten e re -en t *,
n et,I if anyt hino anly ev i no r additional = trapping env be ever2irrd, Frevlone Failure =;
tinn e =icilar.
Ve ri truly v m s r.=,
V2er. X
- t.. t,,i i r w h.
s,p.rin, -i-c, reacli Pottn=.i t n= i c rowe r 4t est i tin W71f: Iih re - - - cre ~.
-m - -- -=== **. =.- r *- e. w a - n m m w - r > ~ evn* a tw