ML20249B939
| ML20249B939 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 08/16/1976 |
| From: | Roy G, Thompson D, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-76-143, NUDOCS 9806250075 | |
| Download: ML20249B939 (1) | |
Text
y u p. O b j u fj (J) &
- 1f% // /e Auguot 16, 1976 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-7 This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation
_and is basically all that is known by IE staff on this date.
1 Facility:
Zion Station Units 1 and 2 (DN 50-295 & 50-304) i Commonwealth Edison Company
Subject:
UNPLANNED GASEOUS RELEASE ABOVE TECHNICAL SPECIFICATION I
l LIMIT 1
Commonwealth Edison Company notified Region III (Chicago) that at about 9:30 a.m. on August 14 the Auxiliary Building vent gaseous effluent monitor approached the technical specification instantaneous release limit.
The gaseous effluent release was identified as cover gas from a leaking manually operated Grinnel-Saunders diaphragm valve, the inlet valve to holdup tank 0 in the ' tdown system.
The licensee isolated the tank terminating the relt e A grab sample was obtained during the release and the maximum release rate was subsequently calculated to be about 82,000 uCi/sec, with a total release duration of about 15 j
minutes.
f The Technical Specification limit for instantaneous gaseous release is 60,000 uci/sec.
Since this rate (if it exists continuously) is based on limiting exposures to people in unrestricted areas to 500 mrem per year or less, the short 15-minute release at the level reported would not contribute significantly to an individual's annual exposure.
The reactors were not shut down as a result of this release.
Region III plans to issue a press release. The State of Illinois has been informed.
Region III received notification of this occurrence by telephone from Commonwealth Edison at 11:00 a.m. on August 15, 1976 and was informed at 8:00 a.m. on August 16, 1976 that the release had exceeded the Technical Specification limit.
Contact:
RFWarnick, IE x27261
Chairman Rowden Commissioner Mason S. J. Chilk, SECY Commissioner Gilinsky C. C. Kammerer, CA G. F. Murphy, JCAE Commissioner Kennedy L. V. Gossick, EDO E. Volgenau, OIE J. A. Harris, PA B. C. Rusche, NRR H. K. Shapar, ELD T. J. McTiernan, AIA l
K. R. Chapman, NMSS R. G. Ryan,'OSP Transmitted: PBldg h ; H St [
MNBB 7 a Luge p J
PRELIMINARY NOTIFICATION U'
i 9806250075 760816 l
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