ML20134P160

NPDES Noncompliance Notification:On 850829,high Steam Flow Coincident W/Low T Avg Safety Injection Occurred Causing ECCS to Initiate & Discharge to Rcs.No Discharge of Radioactive Matls Made to Environ

ML20134P160
Person / Time
Site:	Diablo Canyon
Issue date:	08/30/1985
From:	Thornberry R PACIFIC GAS & ELECTRIC CO.
To:	Brian W SAN LUIS OBISPO, CA
References
NUDOCS 8509060152
Download: ML20134P160 (2)

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i PACIFIC GAS AND E LE C T RIC C O M PANY ppg DIABLO CANYON POWER PLANT i PO. Box 56 Avila Beach, Cahfornia 93424 -(805) 595-7351 R C. THORNBERRY PLANT MANAGER August 30, 1985 Mr. William Briam, Administrator San Luis Obispo County Administrative Office County Government Center San Luis Obispo, CA 93408 ,

Dear Mr Briam:

Pursuant to NUREG-0654, Revision 1, Appendix 1, the following is a summary report concerning an Unusual Event at the Diablo Canyon Nuclear Power Plant site.

On August 29, 1985, Unit 2 experienced a "High Steam Flow coincident with Low Tavg" safety injection. The safety injection signal caused the Emergency Core Cooling System to initiate and discharge to the Reactor Coolant System.

An Unusual Event was declared by the Shift Foreman at 0537 PDT and emergency notifications were completed by 0613 PDT.

This event in no way affected the operability of the plant and no discharge of radioactive materials were made to the environment.

Sincerely, 7):N ROBERT C. THORNBERRY RCT:jhr b i

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DR AD 0 s D I

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f' Mr. William Briam August 30, 1985 cc Mr. William Medigovich, Director California Office of Emergency Services P. O. Box 9577 Sacramento, CA 95823 Mr. John J. Kearns California Office of Emergency Services P. O. Box 9577 Sacramento, CA 95823 Ms. Ann Vasquez California Office of Emergency Services P. O. Box 9577 Sacramento, CA 95823 Mr. John B. Martin, Administrator U. S. Nuclear Regulatory Commission, Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368 Mr. George Whiting, Sheriff San Luis Obispo County P. O. Box 32 San Luis Obispo, CA 93401 Mr. George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Connission Washington, D. C. 20555 Director, Office of Management Information and Progran Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555 DC0456 21