ML18113A846
| ML18113A846 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 02/16/1979 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7902220048 | |
| Download: ML18113A846 (1) | |
Text
e VIRGINIA ELECTRIC AND POWER COMPANY RxoHMOND, VXRGXNJ:A 23261 February 16, 1979:
Mr. Victor Stello., Jr., Director Division of Operating Reactors Office of Nuclear Reactor Regulation U. S.* Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Stello:
COOLING WATER DISCHARGE TEMPERATURE CHANGE RATE Serial No.
097 PO/DLB:scj Docket Nos: 50-280 50-281 License Nos: DPR-32 DPR-37 This letter report is furnished in accordance with the provisions of Surry Power Station Technical Specification 4.14.C.1.
During the period from 0230 to 0330 on February 5, 1979, 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 1 was operating at 100% power and Unit 2 was in coid shutdown during the occurrence.
Discharge coolant temperature increased at: about 4°F/hr. when the Unit 2 water.boxes were isolated* during CLs* HI HI Functional tests.
The cooling effect on the discharge canal created by Unit 2 coolant flow was lost after isolation.
The water boxes were returned to service and the discharge temperature-dropped to normal.
A search was conducted to determine if the temperature change had affected the river environment.
No evidence of detrimental effects were found.
Precautionary notes will be added to testing procedures to m1n1m1ze circulating water valve transient times in an effort to preclude recurrence of this -event.
cc:
Mr. James p*. o*'Reilly Very truly yours,
~.m.'47~-
- c. M. Stallings Vice President-Power Supply and Production Operations