ENS 46782
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ENS Event | |
|---|---|
13:50 Apr 25, 2011 | |
| Title | Single Train Charging Pump Declared Inoperable |
| Event Description | During normal operation with 23 Charging pump in service, an unusual sound was noticed by Operations. All other parameters were normal for the pump, but 21 Charging pump was placed in service as a precaution. Subsequent investigation was unable to conclusively identify the source of the unusual sound and a lower-than-expected crankcase oil pressure was observed on a maintenance run. Therefore, 23 Charging Pump was declared inoperable. This is the alternate safe shutdown pump responsible for inventory control for remote shutdown. NRC guidance indicates that a loss of a single train system not credited in accident analysis is reportable when identified in LCD 3.3.4 'Remote Shutdown.'
The licensee notified the NRC Resident Inspector and the New York Public Service Commission.
The licensee is retracting this report based on the following: Indian Point Unit 2 is retracting the 8-hour non-emergency notification made on April 25, 2011, at 1606 EDT (EN#46782). The notification on April 25, 2011, reported a loss of a single train system identified in LCO 3.3.4 'Remote Shutdown' (SSFF [safety system functional failure]) as a result of declaring the 23 Charging Pump (CP) inoperable. The 23 CP exhibited unusual sound during operation. Because the 23 CP is credited in Technical Specification (TS) 3.3.4 for Remote Shutdown, the inoperable condition was determined to be a loss of safety function. The TS 3.3.4 Allowed Outage Time (AOT) for inoperable conditions is 30 days. In accordance with recent NRC guidance provided to Indian Point for loss of single train systems, although not credited in the accident analysis and specified in Technical Specification 3.3.4, this condition is reportable as a SSFF. Subsequent investigations determined that the documented condition does not pose a challenge to the operability of the 23 CP. The noise was associated with the normal operation of the charging pump internal check valves. This condition is a long term issue that does not affect the current operation of the pump. The pump was in operation with no abnormal parameters noted at the time the noise was noted. No SSFF occurred. The licensee will inform the NRC Resident Inspector. Notified R1DO (Schmidt). |
| Where | |
|---|---|
Indian Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+2.27 h0.0946 days <br />0.0135 weeks <br />0.00311 months <br />) | |
| Opened: | Luke Hedges 16:06 Apr 25, 2011 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Apr 29, 2011 |
| 46782 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Indian Point with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
WEEKMONTHYEARENS 568752023-11-29T20:00:00029 November 2023 20:00:00
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Shutdown the Reactor Single Train Charging Pump Declared Inoperable ENS 467452011-04-10T12:40:00010 April 2011 12:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of an Oil Sheen in the Discharge Canal ENS 464002010-11-07T23:39:0007 November 2010 23:39:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Alert Declared Due to Explosion in the 21 Main Transformer ENS 463922010-11-04T05:23:0004 November 2010 05:23:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Charging Pump '23' Declared Inoperable During Surveillance Testing ENS 462222010-09-01T20:00:0001 September 2010 20:00:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Loss of Temperature Instrumentation ENS 459822010-06-07T14:20:0007 June 2010 14:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Notification of Fatality ENS 455522009-12-09T16:01:0009 December 2009 16:01:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Emergency Sirens Failed to Activate ENS 454322009-10-14T19:00:00014 October 2009 19:00:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Safety System Functional Failure - Alternate Safe Shutdown Source Range Neutron Monitor Inoperable ENS 451522009-06-23T22:23:00023 June 2009 22:23:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Potentially Degraded Inventory Control During Shutdown ENS 447102008-12-10T15:37:00010 December 2008 15:37:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Made Due to Minor Oil Spill ENS 443142008-06-23T18:20:00023 June 2008 18:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Minor Oil Spill ENS 442362008-05-23T07:30:00023 May 2008 07:30:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Charging Pump Declared Inoperable Due to Relief Valve Lifting Below Setpoint ENS 440962008-03-26T15:07:00026 March 2008 15:07:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Minor Oil Spill ENS 440172008-02-29T15:40:00029 February 2008 15:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification of a Small Oil Spill ENS 434742007-07-05T14:01:0005 July 2007 14:01:00 Information Only, 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Inadvertent Activation of Putnam County Siren System ENS 433232007-04-27T19:44:00027 April 2007 19:44:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Inadvertent Siren Actuation ENS 432852007-04-06T15:11:0006 April 2007 15:11:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Main Generator Transformer Explosion - 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