ML18113A762
| ML18113A762 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 01/05/1979 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| SERIAL-NO-014, SERIAL-NO-14, NUDOCS 7901090250 | |
| Download: ML18113A762 (1) | |
Text
- - *.~....----,,.
e VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND,VIBGINXA 23261 January 5, 1979 Mr. Victor Stello, Jr., Director Division of Operating Reactors Office of Nuclear Reactor Regulation U. s. Nuclear Regulatory CoDDD.ission Washington, D. C.
20555
Dear Mr. Stello:
COOLING WATER DISCHARGE TEMPERATURE CHANGE RATE Serial No.
- 014 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 4G15.C.l.
During the period 1400 to 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br /> on December 27, 1978, the condenser cooling water outlet temperature to the James River increased by 5.s*F as measured at the station discharge structure. This temperature rate is in excess of the rate of 3°F per hour permitted by Technical*Specification 4~14.A.3.
During this period, Unit No. 1 was at cold shutdown aiid Unit No.**- - -
2 was steady at*full power. In the process of raising the intake canal level to 26 ft. to perform a special test on the service water sub-system, three out of four waterboxes in Unit No. 1 were throttled closed.
Consequently, the ratio of cold water from Unit No. 1 to warm water from Unit No. 2 decreased, causing the overall discharge water temperature increase. Upon discovery, the three closed waterboxes in Unit No. I were valved open and*
the discharge temperature decreased 5o5°F.
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.
RE.GULA10RY D0CKE1 flLE COPY cc:
Mr. James P. O'Reilly Very truly yours,
~ }1-n;.* '\\ Jr-1" L6 /,&,,,* *. *
~,
- V t, *,.Jj ~
,1..:,
ii' C. M. Stailings Vice President-Power Supply and Production Operations Ceio~
5
,-, /o