ML18136A337

Ro:On 791217,condenser Cooling Water Outlet Temp Exceeded Max Temp Rate Change Permitted by Tech Specs.Caused by Removing Waterbox from Svc Too Rapidly.No Adverse Impact on Environ

ML18136A337
Person / Time
Site:	Surry
Issue date:	12/27/1979
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
NUDOCS 8001020441
Download: ML18136A337 (1)

Text

e e VI~GINIA ELECTRIC AND ,PowER COMPANY RICHMONl>,VIRGINIA 23261 December 27, 1979 Mr. Darrell G. Eisenhut, Acting Director Serial No. 1166 Division of Operating Reactors PO/RMT:scj Office of Nuclear Reactor Regulation Docket Nos.: 50-280 U. s. Nuclear Regulatory Commission 50-281 Washington, D. C. 20555 License Nos.: DPR-32 DPR-37

Dear Mr. Eisenhut:

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

During the period from 0100 to 0200 on December 17, 1979, the condenser cool-ing 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 1 was- operating at 100% power and Unit 2 was at cold shutdown during the occur-rence.

While investigating a possible leak in the condenser, the temperature rate of change reached 3.5°F/hr. This occurrence was caused by removing a waterbox from service too rapidly. Despite emphasis placed on cautious removal of waterboxes to avoid excessive temperature rates of change, the limited flow of water makes adherence to the Technical Specification limit difficult.

A search conducted to determine if the temperature change had affected the river environment reyealed no detrimental evidence.

Very truly yours,

b. )2'?. vJl-at: nr C. M. Stallings Vice President-Power Supply and Production Operations cc: Mr. James P. O'Reilly 000102 0 __ Lj'--I-I