ML18139A274

Ro:On 800512,condenser Cooling Water Outlet Temp Exceeded Temp Change Rate of 3 F/H.During Power Escalation W/Only Three Circulating Water Pumps in Operation,Canal Intake Level Dropped & Groin Temp Reached Change Rate of 5.5 F/H

ML18139A274
Person / Time
Site:	Surry
Issue date:	05/23/1980
From:	Sylvia B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
457, NUDOCS 8005300389
Download: ML18139A274 (1)

Text

e VIRGIN:IA ELECTll.IC A.ND POWER COMPANY Rxc:e:MOND, VrRGXN 1A 23261 May 23, 1980 Mr. Harold R. Denton, Director Serial No. 457 Office of Nuclear Reactor Regulation NO/RMT:ms Attn: Mr. Steven A. Varga, Chief Docket Nos: 50-280 Operating Reactor Branch No. l 50-281 Division of Licensing License Nos: DPR-32 U.S. Nuclear Regulatory Commission DPR-37 Washington, D.C. 20555

Dear Mr. Denton:

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

During the period from 0000 to 0100 on May 12, 1980 the condenser cooling water outlet temperature exceeded a temperature change rate of 3°F/hr., which is the maximum permitted by Technical Specification 4.14.A.3. Unit l was operating at 50% power and Unit 2 was in cold shutdown during the occurrence.

During power escalation with only three (3) circulating water pumps in opera-tion, the canal intake level began to drop. While throttling the waterboxes in the process of maintaining the canal level, the groin temperature exceeded the allowable limits established in Technical Specification reaching a rate of change of 5.5°F/hr.

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

Very truly yours,

~~

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