ML18153D131
| ML18153D131 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 09/15/1992 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 92-354A, NUDOCS 9209240043 | |
| Download: ML18153D131 (2) | |
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VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 September 15, 1992 U. S. Nuclear Regulatory Commission Region II - Suite 2900 101 Marietta Street, N. W.
Atlanta, Georgia 30323 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS l AND 2 SPECIAL REPORT UPDATE WASTE GAS HOLDUP SYSTEM H2 MONITORING INSTRUMENTATION
- Serial No.
SPS/MDK/GDM Docket No.
License No.
92-354A R4 50-280 50-281 DPR-32 DPR-37 In our letter dated July 3, 1992 (Serial No.92-354), we provided a special report that discussed operational difficulties with the Waste Gas Decay Tank (WGDT) hydrogen*
monitors. We committed to provide an update to the report if the hydrogen monitors were not restored to an operable condition by July 31, 1992. The modifications described in the report have been completed, and the monitors have been returned to service. However, operability has been intermittent and improved reliability has not beer achieved. Consequently, we are submitting this letter to provide additional information regarding our continuing efforts to improve the operation of the hydrogen monitors. The oxygen monitors continue to operate satisfactorily.
Although we have implemented the corrective actions recommended by the vendors, the reliability of the hydrogen monitoring equipment has not improved. Consequently, we are assessing our alternatives to enhance system performance. We are presently evaluating a short term action plan to improve the reliability of our existing hydrogen monitoring equipment. We are also performing an overall system design review for potential design modifications in the long term. As noted in our previous letter, a Technical Specification change request was prepared and submitted to the NRC on July 28, 1992 (Serial No.92-486). These changes would delete the requirement to monitor hydrogen in the WGDTs, and would rely on monitoring and restricting the oxygen level in the tanks to avoid generation of a potentially explosive ga~ mixture.
Pending approval of the proposed Technical Specification change, efforts to maintain the operability of the hydrogen monitors will continue. Daily grab samples are taken
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9209240043 920915 PDR ADOCK 05000280 S
e whenever the monitors are out of service to ensure compliance with the Technical Specifications.
Should you have any questions or require additional information, please contact us.
W. L. Stewart Senior Vice. President - Nuclear Attachment cc:
U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Mr. M. W. Branch NRC Senior Resident Inspector Surry Power Station