ML18153A789
| ML18153A789 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 04/06/1995 |
| From: | Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 95-122, NUDOCS 9504130090 | |
| Download: ML18153A789 (2) | |
Text
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e VIRGINIA. ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 April 6, 1995 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC. 20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 Serial No.
NL&P/ETS:
Docket Nos.
License Nos.95-122 RO 50-280 50-281 DPR-32 DPR..(37 WITHDRAWAL OF PROPOSED OPERATING LICENSE AMENDMENT RUPTURE OF A MAIN STEAM LINE In May of 1990, the Virginia Electric and Power Company requested license amendments for Surry Power Station Units 1 and 2 (Serial No. 90-094A) to reference a revised analysis for rupture of a main steam line in containment. The proposed amendments referenced the latest analysis of the main steam line break scenarios in the operating licenses without credit for the pressurizer pressure safety injection function. During a programmatic review of instrument channel uncertainties, it was identified that potentially large instrument uncertainties could exist for the pressurizer pressure transmitters in a harsh environment.
It was further identified that this phenomenon only impacted one* limited scenario involving a small main steam line break.
However, to ensure continued safe operation, the main steam line break accident scenarios were reanalyzed without credit for the low-low pressurizer pressure safety injection function. This reanalysis indicated that there were no safety concerns.
Since the amendment request, the pressurizer pressure transmitter instruments have been upgraded and the low-low pressurizer pressure-safety injection setpoint has been modified to ensure operation of the transmitter in the harsh environment created by the postulated small main steam line break in containment.
Therefore, the proposed license amendments are no longer necessary and are hereby withdrawn.
Should you have any questions or require additional information, please contact us.
Very truly yours,
~?OJI~
James P. O'Hanlon Senior Vice President - Nuclear
(--9-s6~~o0~0-~ 950406 PDR
- ADOCK 05000280 p
cc:
- U.'S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.
Suite 2900 Atlanta, Georgia 30323 Mr. M. W. Branch NRC Senior Resident Inspector Surry Power Station Commissioner Department of Health Room 400 1 09 Governor Street Richmond, Virginia 23219