ML17326A677

Ro:On 800412,during Filling of Chemical Vol & Control Sys Holdup Tank W/Dimineralized Water,Holdup Tank Inadvertently Pressurized Over Safety Valve Setpoint of 12 psig.Xe-133 & I-131 Released from Vent

ML17326A677
Person / Time
Site:	Cook
Issue date:	04/22/1980
From:	Shaller D INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
References
NUDOCS 8004290417
Download: ML17326A677 (2)

Text

~ 0cH4 INDIANA 8 MICHIGAN.flfCTRICCOMPANY DONALD C. COOK NUCLEAR PLANT P.O Box 458,'Bridgman, Michigan 49106 (619 4654901 April 22, 1980 Mr. J.G. Keppler, Regional Director Office of Inspection and Enforcement United'"States, Nuclear. Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 Operating License DPR-58 and DPR-74 Docket Nos. 50-315 and 50-316 Dear Wi . Keppler'..

This letter. is to inform. you of an incident which occurred at the Indiana and Michigan Electric Company's Donald C. Cook Nuclear Plant on April 12, 1980, which was reported to Mr. R.E. Masse of .the NRC on the date of the occurrence.

During the filling-of a chemical volume and control system hold-up tank with demineralized w'ater (for the purpose of purging the gas space in the tank to.

lower the high oxygen content) the tank was inadvertently pressurized over the safety valve setpoint of 12 PSIG. The safety valve relieves to the Auxiliary'uilding sump which is open to the Auxiliary Building atmosphere and is ultimately discharged at the stack vent.

The release was detected by the stack vent radiogas monitor R-26 with-the alarm alerting the operators of 'a 'possible leak. Prior to terminating the filling of the tank, the safety had intermittently relieved.

Gas was released from the vent from 1041 to 1147 hours0.0133 days <br />0.319 hours <br />0.0019 weeks <br />4.364335e-4 months <br /> on April 12, 1980. A total of 1.786 Ci of Xe-133 was released at the maximum rate of 4.51 x 10 " Ci/

Sec. This is 5.5 percent of the noble gas Technical Specification Appendix B

=

Instantaneous Release Rate Limit Section 2.4.3.a. 1.

Also released were 3.24 x 10~ Ci of I-131 at a rate of 8.17 x 10 Ci/Sec.,

which is 0'.012 percent of Technical Specification Appendix B Instantaneous Release Rate Limit Section 2.4.3.a.2.

This occurrence had'no effect on the health and 'safety of the public.

Sincerely, D.V. Shaller Plant Manager

/bab cc: See Attached Distribution List

Mr. J.G. Keppler April 22, 1980 Page 2 of 2 cc: J.E. Dolan R.S.. Hunter R.W.. Jurgensen RM. Kroeger R.W. Kilburn R.E. Masse RO:III R.C. Callen MPSC J.M. Hennigan G. Ols'on W. Lavallee EPRI PNSRC J.F. Stietzel E.L. Townley Dir., IE (20 copies)

Dir., MIPC (2 copies)

Directorate of Licensing (1 copy)