ML17326A547

Updates Aeo 80-001/04X-0:on 800220,unplanned Release of Na-24 Contaminated Steam Occurred.Investigation Estimated Total Release of Na-24 Was 2.38 E-6 Ci at 0.11% Concentration of Tech Spec Limit

ML17326A547
Person / Time
Site:	Cook
Issue date:	02/26/1980
From:	Shaller D INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
References
NUDOCS 8003050209
Download: ML17326A547 (6)

Text

REGULATO INFORMATION DISTRIBUTION TEM (RIDS)

ACCESSION NBR:8003050209 DOC ~ DATE: 80/02/26 NOTARIZED; NO DOCKET ¹ FACIL;50~316 Donald C.. Cook Nuclear Power Plantg Unit 2i Indiana, 8 05000316 AUTH'AME AUTHOR AFFILIATION SHAI LERiD,V, Indi anai 8, Michigan Elect r i c Co ~

REC IP ~ NAME REC IP IENT" AFFILIATION

SUBJECT:

Updates AEO 80 001/00X 0:on 800220Eunplanned re lease of Na 24 contaminated steam occurred. Investigation estimates total release of Na'>>24 was 2,38 E,"6 Ci at 0.11%

concentration: of Tech Spec ~

DISTRIBUTION CODE: COOSB COPIES RECEIVED:LTR g ENCI.

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/ INDIANA 5 MICHIGANELECTRIC COMPANY DONALD C. COOK NUCLEAR PLANT P.O. Box 468, Bridgman, Michigan 49106 (616) 466-6901 February 26, 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-74 Docket No. 50-316 AEO No. 80-001/04X-0

Dear Mr. Keppler:

On February 20, 1980, a written report was sent to you describing an event which occurred at the Donald C. Cook Nuclear Plant, Unit 2. In that report it stated that after a manual trip on Unit 2 the power operated relief valves were opened for a short period of time causing an unplanned release of Sodium 24 (Na-24) contaminated steam.

Investigation has shown that the power operated relief valve on 84 Steam Generator (MRV-243) was open and passing 320,000 lbs./hr. steam from 0250 to 0400 hours0.00463 days <br />0.111 hours <br />6.613757e-4 weeks <br />1.522e-4 months <br /> on February 19, 1980 as read on recorder 2-MR-020. The Na-24 in the steam generator was injected as part of a test being conducted on the moisture separator reheaters and laboratory analysis indicated that the concentration in the steam generator was 5.6 E-6 pCi/cc at the beginning of the release. By calculation, the actual release concentration was 5.47 E-12 11Ci/cc Na-24.

The applicable Technical Specification limit from 10CFR20 Appendix B, Table II, Column I for Na-24 in air to an unrestricted area is 5.0 E-9 i1Ci/cc.

The total release was 2.38 E-6 Ci at a concentration which was 0.11 percent of the Technical Specification limit.

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

Sincerely,

~ D.V. Shaller Plant Manager COd3 SP

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Mr. J.G. Keppler February 26, 1980 Page 2 of 2 cc: J.E. Dolan R.S. Hunter R.W. Jurgensen R.F. Kroeger R. Kilburn R.E. Masse RO:III R.C. Callen MPSC G. Charnoff, Esq.

J.M. Hennigan G. Olson W. Lavallee EPRI

<Dir , IE (20 copies)~

Df,r;, MIPC (2 copies)

Directorate of Licensing (1 copy)

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