ML20236V350

PN-75-074:on 750820,instantaneous Gas Release of 105,000 Uci/Sec Occurred from Auxiliary Bldg Stack at 1700 H.No Personnel Exposure Limits Were Exceeded.State of Il Notified

ML20236V350
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	08/21/1975
From:	Jennifer Davis, Thornburg H, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PN-75-074, PN-75-74, NUDOCS 9808030107
Download: ML20236V350 (1)

Text

f r & o}WG h PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE y B August 21, 1975 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE --FN-75-74 (m"ih This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information 2 presented is as initially received without verification or evaluation and is basically all that is known by OIE staff as of 5:00 p.m. on the date of this notification. IT SHOULD BE SPECIFICALLY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENTLY WILL BE ISSUED IF WARRANTED.

Facility: Zion Unit 1, Commonwealth Edison Company

Subject:

UNPLANNED STACK GAS RELEASE ABOVE TECHNICAL SPECIFICATION LIMIT The Commonwealth Edison Company notified an IE:III inspector at the site that an instantaneous gas release of 105,000 uCi/sec occurred from the auxiliary building stack at 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> on August 20, 1975.

The release exceeded the 60,000 uC1/see Technical Specification limit for approximately 12 minutes.

\

The occurrence was caused by venting letdown water gases tc., the auxiliary building equipment drain tank while the hatch co' vers were  %

-not properly secured. This caused the release of gas to the auxiliary ~

and refueling buildings. .

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I Commonwealth Edison reported that no personnel exposure limits were exceeded. A press release is being considered by the licensee. The State of Illinois has been notified.

A health physicist from the Chicago Regional Office will be at the site on August 22, 1975, to review the circumstances relating to the event.

Region III (Chicago) received notification of this occurrence from the inspector at the site who was informed by Co=monwealth Edison at 1445 hrs on August 21, 1975.

Contact:

RFWarnick, IE x7261 HDThornburg, IE x7353 JGDavis, IE x7541 Distribution:-

Chairman Anders Commissioner Mason S. J. Chilk, SECY Commissioner G111nsky Commissioner Rowden G. F. Murphy, JCAE Commissi 6er Kennedy C. C. Kammerer, CA - -

l L. V. Gossick, EDO D. F. Knuth, IE J. A. Harris, PA 7~ ',

i B. C. Rusche, NRR H. H. Brown, ISP T. J. McTiernan, AIA K. R. Chapman, NMSS H. K. Shapar, ELD , [,

. Transmitted: P Bldg 9 k.t ; H St 9 Nc . ; MNBBfN[v  ; Luge pt d k.' PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE 9808030107 750821 PDR I&E PN-75-074 PDR

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