PNO-III-80-063, on 800331,unplanned Gaseous Radiation Release Occurred Because of Operator Error in Operating Valves. Preliminary Analysis Indicates Release Rates Did Not Exceed Tech Spec Limits

PNO-III-80-063:on 800331,unplanned Gaseous Radiation Release Occurred Because of Operator Error in Operating Valves. Preliminary Analysis Indicates Release Rates Did Not Exceed Tech Spec Limits

ML20126D366
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	04/01/1980
From:	Boyd D, Kohler J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-80-063, PNO-III-80-63, NUDOCS 8004280641
Download: ML20126D366 (2)

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i l.- ( , PRELIMINARY NOTIFICATION FAGP. I of 2 PA_t__,3 'p,te: Ap,L1 j, 1980 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-80-W This preliminary notification constitutes EARLY not. ice of eveuts of POSSIRT.E safety or public interest significance. The inforr33 tion present.cd is ac initially received without verification or evaluation and is basically all

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'thet is known by lE staff as of this date. z ,,

Facil l,LJ: Comuuwsalth Rdison Cuinpany

• /. ion S ta ti on . Un l Ls 1 Mu d 2

Donkut Nux.: 50- 295 and 50-304 g, Xfun, T1.

Zubj ec_t,: ITNpLANNED, GASy.0113 RADIATTON REl#ASE On April 1, 1980 the licennee notified the Resident inspe.ecor of an entplanned gaceous re.Lexwe that had occurred on % rch 31. J980.

At approximately 164"> on Arch 31, 1980 while both unitu were upcrating'.0, at full power the vent ntack conit. orc 1 PR 75 (Unit 1),alar:acd 7 l'a 25 (Unit

. Investigations and the auxilinry building veul exhnust monitor, R-14, by the. iicennee revealed th>it. during the sampling of the l'ni r, 2 mixed The hed derineralizier a decin Valve won inadverruutly opened and le.f t epen.

campic vaIve for purging mni had opened the opera rnr had 4.ntetaled to open uof this drain vulve being lef t ope.n, apprey.Jostely wro,ng valve. As n reuult

/00 gallond of reactvr coolant nywt'on wat.er was drained from the Unit 2 Druir: Tank. This viinly-1.etdown Syuten into the Auxiliary Mullding Equipment j ment drain tank la, vented thr u char coa.t filterN Le auxilia ry building vent stack.

31, 1980, anti the The incorrectly opened valve was cloned at.190'ipuring on Mxrch this event the 1 PK 75 ,

stack tauni torw chnwed an immcdiate decreas.a.

monitor pe.aked at 2000 counts per sonvud and the 2 PR 25 monito: peaked at 1800 counts per scennd. (Hnekground reading on thene two monitors is 50 count.s por second. )

Preliminary analycds. by the. licensee indicatec that the. inst.antaneuuc re tcar.e rate. was 7500 microcuries per second (the Technical Speciflention Jimit ic

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60,000 micrneurier. per second). ' .

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ThIs' FN 19 issued for informat$ on only.

Media inLerent is pnswible becauxe. of the cenwicivit.y In radiat ion re.1cacax.

The licencee has not. w N n decisien un the. iuuvance nt a precs reloxxe.

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800.4280641

8 PRELIMINARY NOTIFICATION

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PNO-III 63 PACE 2 of 2 PACES April 1, 1980 Tho. WC, plans to make a press release.

.The State of Illinois will be notified. .

Enforr.ement act. inn regarding the apparent failure to meet the reporting rLquirementa of 10 CFR 50.72 is being reviewe.d with the licensee.

Contact:

D. C.e4 #-

Boyd, R111; 384-2546, J. E. Kohler, Resident Inspector, 312/746-2323.

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Distribution: Transc:1tted H St Chairtun Ahearne Commiswinner Hend rie. S. .l. Chilk, SECY Coter.1ssioner Cilinsky Cotraissioner Bradford C . C . Ku ume r e r , - CA -

cotamissioner Kennedy ACRS

.(For Distribution)

Trans::.it t e d : MNBB P . B l d g , ,_ , _,_ _ 1E:XOUS k'. J. Dircks ,' EDO (IE:HQ Did .)

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" , H. R. Denton,'NRR C. Michelson, AEOD D. R. Muller, NRR

.T..T. Fouchard, PA R. J . Ma t t son , N RR N. M. Haller,' MPA D. Vansa116,' HRR R. G. Rynn, OSP D. Eisenhut, NRR ,

H..K. Shnpar, ELD SS Bldg _O%T T.)

.J. C. Davis, NMSS .R. Minogue,-SD R. J. Budnitz, RF.S 115:X005 PRELIMINARY NOTIFICATION

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