ML18139B287

Ro:On 810418,condenser Cooling Water Outlet Temp Exceeded Max Average Rate of Change of 3F/hr Per Tech Spec 4.14.A.3. Lack of Svc Water Flow Believed to Be Contributing Factor. Tube Leaks Repaired.River Environ Not Affected

ML18139B287
Person / Time
Site:	Surry
Issue date:	05/01/1981
From:	Sylvia B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Harold Denton, Varga S Office of Nuclear Reactor Regulation
References
NUDOCS 8105050252
Download: ML18139B287 (1)

Text

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e VIRGINIA ELECTRIC A.ND POWER COMPANY R:u;:HMOND,VIRGINIA 23261 May 1, 1981 Mr. Harold R. Denton, Director Serial No. 277 Office of Nuclear Reactor Regulation NO/RMT:jmj Attn: Mr. Steven A. Varga, Chief Docket No. 50-281 Operating Reactor Branch No. 1 License No. DPR-37 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Denton:

This letter report is submitted in accordance with the provisions of Surry Power Station Technical Specification 4.14.C.l.

During the period from 0430 to 0530 on April 18, 1981, the condenser's cooling water outlet temperature exceeded the maximum average rate of change of 3°F/hr permitted by Technical Specification 4.14.A.3. The average rate of change during this period was 4°F/hr. At the time of this event, Unit No. 1 was at cold shut-down and Unit No. 2 was in the process of shutting down, at 10% power.

The lack of service water flow through Unit No. 1 is believed to be a contributing factor to this event. Feedwater heater tube leaks were creating heater level control problems, especially at low power levels. This necessitated the use of a higher than normal ramprate, thereby providing increased turbine protection. The tube leaks have subsequently been repaired.

A search was conducted to determine if the temperature change had affected the river environment. No detrilllental evidence was found.

Very truly yours,

~ 0.f~

B. R. Sylvia Manager - Nuclear Operations and Maintenance cc: Mr. James P. O'Reilly