ENS Event | |
|---|---|
22:20 Nov 3, 2003 | |
| Title | Non-Conservatism in Design Methodology for Loss of Rcp (Reactor Coolant Pump) Seal Cooling |
| Event Description | The design data used to support Dominion's methodology to cope with a loss of [RCP] seal cooling (which was based on Westinghouse WCAP-10541 Rev. 2) may be non-conservative. The NRC issued an SER on Westinghouse report WCAP-15603 that indicates data from this new model must consider a 20% probability that the hot RCP seals may result in up to 182 gpm leakage per pump if seal cooling is lost for more than 13 minutes. Assuming this higher leak rate, the requirements of Appendix R,Section III.L, cannot be met since Pressurizer level could not be maintained. Current methodology indicates Surry will lose charging and seal cooling for greater than 13 minutes from a fire in the Emergency Switchgear Room. This report is being made pursuant to 10 CFR 50.72 (b)(3)(ii)(B).
The NRC resident [inspector] was notified of this condition. |
| Where | |
|---|---|
Surry  Virginia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-4.73 h-0.197 days <br />-0.0282 weeks <br />-0.00648 months <br />) | |
| Opened: | James Shell 17:36 Nov 3, 2003 |
| NRC Officer: | Gerry Waig |
| Last Updated: | Nov 3, 2003 |
| 40292 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 554592021-09-13T22:22:00013 September 2021 22:22:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition of Fire Safe Shutdown Equipment ENS 544372019-12-11T18:56:00011 December 2019 18:56:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Potential Tornado Missile Vulnerabilities ENS 407702004-05-22T01:46:00022 May 2004 01:46:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Auxiliary Feedwater Not Being in Compliance with Justification for Continued Operation (Jco). ENS 403892003-12-12T16:19:00012 December 2003 16:19:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Both Trains of Auxiliary Feewater Were Declared Inoperable for One Hour and 22 Minutes. ENS 402922003-11-03T22:20:0003 November 2003 22:20:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Non-Conservatism in Design Methodology for Loss of Rcp (Reactor Coolant Pump) Seal Cooling 2021-09-13T22:22:00 | |