ML18136A092
| ML18136A092 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 10/18/1979 |
| From: | Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| 823-0921-79, 823-921-79, NUDOCS 7910230568 | |
| Download: ML18136A092 (1) | |
Text
VIRGINIA EJ.EC'.l'RIC AND POWER COMPANY RICHMOND,VIRGJ:N.IA. 23261 October 18, 1979 Mr. Harold R. Denton, Director Office of Nuclea~ Reactor Regulation Attn:
Mr. Darrell G. Eisenhut, Acting Director Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Sir:
Serial No.
823/092179 PO/DLB:baw Docket Nos. 50-280 50-281 License Nos. DPR-32 DPR-37 We received your letter of September 21, 1979, requesting information on the potential for multiple equipment failures and challenges to safety systems at pressurized water reactors.
Our letter of August 21, 1979, Serial No.
580/062679 provided the results of our review for North Anna Power Station Units 1 and 2 in re~ponse to your June 26, 1979, letter.
This letter provides the requested information for Surry Power Station Units 1 and 2.
A review of the current testing procedures reveals that provisions are incorporated which, when coupled with plant design, should prevent inadvertent challenges to the safety related systems and provide adequate instruction to the technicians performing the periodic test (PT).
Each PT is written to test only one channel at a time and is performed by 2 quali-fied technicians in continuous communication.
Specific instructions as to when a PT can be accomplished, and what precautions must be exercised to prevent affecting the operating unit are incorporated at appropriate steps within the PT.
A review of the station monthly operating reports and unit trip status re-ports indicates that no common mode failures have occurred which prevented safety systems from performing or being able to perform their intended functions.
A review of station monthly operating reports and unit trip status reports indicates that during previous years of operation, some events that might be considered multiple failures have occurred due largely to pro-cedural inadequacy and in some instances, operator error.
In each case, a review of the problem was conducted and corrective actions were taken.
Also, as requested, we have re-emphasized the importance of avoiding challenges to the protective features of our facilities.
This was accomplished by revising an existing standing order.
cc:
Mr. James P. O'Reilly Very truly yours, Wc£!.4;.-,
C. M. StaUi.ngs Vice President-Power Supply and Production Operations