ML18113A788
| ML18113A788 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 01/15/1979 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7901180174 | |
| Download: ML18113A788 (1) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RrCHMOND, VIRGIN IA 23261 January 15, 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.
030 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 0845 to 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br /> on December 31, 1978, the Condenser Cooling Water Outlet temperature to the James River increased by 3.5* and then decreased by 3.0°Fas measured at the station discharge structure. This temperature change rate is in excess of the rate of 3°F per hour as permitted by Technical Specification 4.14.A.3. During this period, Unit No. 1 was at cold shutdown while Unit No. 2 was at a steady power level.
The intake canal level had been on a downward trend for several hours.
The Unit No. 1 operator throttled the discharge valves of the waterboxes to restrict the flow of water out of the intake canal.
As the canal level rose, he adjusted the valves in the open direction, to stabilize the canal level. Subsequently, a spike on the temperature recorder was noted, which indicated a rapid increase followed by a less rapid decrease in discharge water temperature.
A memorandum to the Operations Department has been generated which limits the changing of flow rates through the main condensers.
This action was taken in an effort to preclude recurrence of this violation.
A search was made for evidence that the temperature change rate experi-enced had affected the river or its inhabitants.
No evidence of any detrimen-tal affects were found.
REGULATORY D0C1{El FILE COPY cc:
Mr. James P. O'Reilly
'i9011so 111; Very truly yours, J
~f C. M. Stallings Vice President-Power Supply and Production Operations p