05000219/LER-1982-021-01, /01P:on 820416,primary Containment Atmosphere Not Reduced to Less than 5% Oxygen within 24-h After Reactor Mode Selector Switch Placed in Run Position.Caused by Insufficient Nitrogen & Blown Rupture Disc

/01P:on 820416,primary Containment Atmosphere Not Reduced to Less than 5% Oxygen within 24-h After Reactor Mode Selector Switch Placed in Run Position.Caused by Insufficient Nitrogen & Blown Rupture Disc

ML20052G001
Person / Time
Site:	Oyster Creek
Issue date:	04/16/1982
From:	Fiedler P GENERAL PUBLIC UTILITIES CORP.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-82-021-01P, LER-82-21-1P, NUDOCS 8205140223
Download: ML20052G001 (3)

LER-1982-021, /01P:on 820416,primary Containment Atmosphere Not Reduced to Less than 5% Oxygen within 24-h After Reactor Mode Selector Switch Placed in Run Position.Caused by Insufficient Nitrogen & Blown Rupture Disc

Event date:
Report date:
2191982021R01 - NRC Website

text

---

~

DESIGITATED OIIIGI'dd, (7, /E d Cert Ried By

.t. R:::am C. Fyns,id:n.estntcr i

kgien I l

U.S. Ibclear Peg:lat::rf h ie* W 631 Park k.m:e

.Gg of Pn:ssia, PA 19406 J

GPO }bclear Oyster Creek nelear Generating Str.icn Docket !b. W219 i

Rried River, New "ersav C8731 a

.4 Beputah!e -

_u aspc:t !b. 5C-219/22-21/01?

n L.EP tie &llodng is a p1Mwy :grt. hei.c submitted in a:::alianca with t!:e Wm1 WW, pW 6.9,2.s. (3).

27.:

)(ril 16,. ISS2 P.m1Mv.rf Mm'11:

s v

Peter B. Fiailer Vi::e.*% ?. x! Dir.or Opter Cn:ek

. i r Q)

f Mt.v.;;asent T**% and a Cact:ol

)

Imr linalatcrv mi=%

o I

w ten, D.c' 20555 i

I fr.s ide.r.t. Irm...!..(1).

.9 St:$n..

.Teek h2 ear G2:P. di

.ti'.U, M3# hf C6731 8205140223 820416 8 S1 PDR ADOCK 05000219 5

S PDR

\\

N

+

p b

g,

.1

_f'

'q gg S-3

' +'

ne.p. = _ 31.

n y,.

. g.

-% u. g ;_ + % ; - :

_ ;,..;. ::q %,% _

j '. '

;'. ' ^ :'

' ~.

f

_,, _-,.,. l l..=,c-

^

j ' j.. a.' ;.:.;.'e,

"' '. _ '.+

,_,,..s.,

... ;__ y l.

. m..;.

q _.

t Electrical 319 We i

teseristica of Cee=.r-em Co Triday, April 16, 1952 at 1409 heurs (24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after placing the reactor sode switch in ".an), the Tryvell erygen concentration was greater than 52.

l contai=nent inertirt was in progress at the time and had been since 1650 hours0.0191 days <br />0.458 hours <br />0.00273 weeks <br />6.27825e-4 months <br /> At 17)0 on 4/15/82, the Torts see inerted; therefers, inerti=g the day before.

of the Or7wil was.ge=ce,neede.,it C4M os,4,/16/82,igrtitts,of the,Dryval,1,ves,,,,,,

stopped because a level of W was rt4Ched it the titroget supply taalL3.

I (Mini:=2 of 50" level is required by procedars.) At 0345, the nitregen system was restarted which i=ediately blev s rupture disc. The rupture disc ves At 1407 l

replaced by 1045 a:d the inerties process cemenced again at 1050.

hours, the crygen r-sdieg was greater than 5: (5.5%) a~i the tryvell/Terus pressere diffe:ectial was 0.54 psi. Les, a reacter shutdwa was commenced vi:ile the i=erti:g ce:tissed. At 1521, the ?ryvell crygen concentratica sus l

4.5% and the Oryw11/7 crus ;rtss.re differential was 1.31 psi shich are within the ac:eptable raege; therefore, the s'esti:vt was terminated.

i I

{' - -

L.:::M I

& d~

y r,

n

,*f 9.-

.a g,~:.,.'.

D.'[V 1Q@ i )4." %.{ N, {.%.l * -

• . ?. '_, ; ',

, 11

.-' + '

7 4[

'#'N '., %% gj>y t,

.\\,,,,

i,

~. x )., J i.'. +.,. J.,. ',.,l

(

~

.T'...'.,.

• [ -A # E~4

., y

,s...,,

,.s i

Licensee Event Zerort Page 2 leportable Ceeurre:ce 3o. 50-219/62-21/012

.harent Cane of Cearrence ne major contrihating factors in this evest vere the loss of enr six honi ir.erting time due to itssificient nitreges in the supply taak and a bicva rupture disc. The cause of the b1cva rupture disc and the sequence of eve:

leading up to the plant shutdcvs due to a limiting conditica for opention still n: der inestigatien and will be incloded in the follcamsp report.

Azalesis af Oc:urreree The cestain:ent atzsphere control system is designed to asistain an inert atmesphere within the primary contaitza.st to preclude energy releeses from possible hydrogen-oxyges reaction followi=g a postulated less of coolant accident stich eculd jeopardize the integrity of the contan: ment. Conserva 1

estimates of the hydrogen pros:ced is11eving the postulated loss of coolam:

accident with the operatics of either e re spray system show that the hydre produced from the ietal-water reaction voald result in a hydregen concentre i

of 0.4% in de pri:ary contaitzent. Bis concentration is significantly be

- de ec::e:tratics at shich hydroges ess he igsita/ cia-sin--Ecverar,--icertj of the pri-ary contai= eat was included in the p.eposed design and operati:

preelede the pessibility of as energy release within the prisery ecutrimse:

frem a hydrogen myges resetic: n: der more severe conditions thas could be l

foreseen.

l In addities, censideri:g that the hyvell Oyzges concentration van only slightly above 5% for a relatively short time the safety significance is censidered =ici:al.

Corrective ktien In:ediate c rrective actions tahes vere to ecmence a reactor shutdown and continue irerting the contai::ent. He shstdeva was teminted when the

'i contai::me:t oxygen concentration was reduced to less than 51 and the requir Drgell to Torts differe:tial pressure had been established.

i Tutere cerrective setic:s, if any, will be datermined after a full inv=stipties of the event is cc:pleted.