ENS 42588
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ENS Event | |
|---|---|
19:00 May 18, 2006 | |
| Title | Unevaluated Failure of Charging Pump in Fire Scenario |
| Event Description | On May 18, 2006, it was determined that a previously unevaluated failure mode of charging pumps during a certain 10 CFR 50 Appendix R fire scenarios existed. Charging pumps are credited for specific fire scenarios to be available to make up inventory and provide reactivity control in the reactor coolant system. The engineering evaluation determined that an Appendix R fire scenario could potentially result in the failure of a circuit which would cause the credited charging pump to be tripped and held tripped by the undervoltage protection circuitry. The postulated failure would require diagnosis and manual actions to operate the charging pump.
A preliminary analysis of the core damage risk associated with this condition was performed, taking into account the frequency of fires in all of the affected areas, the potential failure of fixed and/or manual fire suppression systems, and the required manual operator actions (with assumed failure likelihoods). The results indicate that the additional core damage frequency (CDF) associated with this condition is approximately 1.2E-07/yr. Procedures changes to address this issue are being developed. The NRC Resident Inspector was notified of this event by the licensee. |
| Where | |
|---|---|
Ginna  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+0.67 h0.0279 days <br />0.00399 weeks <br />9.17766e-4 months <br />) | |
| Opened: | Kyle Garnish 19:40 May 18, 2006 |
| NRC Officer: | John Mackinnon |
| Last Updated: | May 18, 2006 |
| 42588 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 499142014-03-13T20:30:00013 March 2014 20:30:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Postulated Hot Short Fire Event That Could Adversely Impact Safe Shutdown Equipment ENS 493742013-09-20T20:00:00020 September 2013 20:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Potential Design Basis Flooding Issues Related to Battery Room Wall Penetrations and Cable Vault Floor Drains ENS 489182013-04-12T14:10:00012 April 2013 14:10:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition - Missing Backflow Preventer ENS 483332012-09-21T18:00:00021 September 2012 18:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Identified in Appendix R Fire Scenario ENS 471672011-08-18T14:00:00018 August 2011 14:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition That Could Potentially Impact Both Trains of 480V Safeguards Buses ENS 467352011-04-06T19:30:0006 April 2011 19:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Degraded Fire Barrier ENS 428312006-09-07T02:00:0007 September 2006 02:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Historical Unanalyzed Condition Identified ENS 425882006-05-18T19:00:00018 May 2006 19:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unevaluated Failure of Charging Pump in Fire Scenario ENS 408932004-07-22T13:42:00022 July 2004 13:42:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Gap Discovered in Control Room Envelope ENS 401842003-09-19T22:00:00019 September 2003 22:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition 2014-03-13T20:30:00 | |
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