ENS 43649
ENS Event | |
|---|---|
13:43 Sep 18, 2007 | |
| Title | Refueling Water Storage Tank Temperature Above Operating Limits |
| Event Description | At 0043 on 9/18/07, during performance of Technical Specification (TS) Surveillance Requirement (SR) 3.5.4.1, the 2T-13 Refueling Water Storage Tank (RWST) was found to be at 105 degrees F. Limiting Condition for Operation (LCO) 3.5.4 A was therefore not met due to temperature being above the parametric value limit of 97 degrees F (100F technical specification value).
The cause of the elevated temperatures of 2T-13 is currently under investigation. At 0843 an orderly shutdown of Unit 2 was commenced because of the continued elevated temperature of the Refueling Water Storage Tank. Troubleshooting to identify the cause of the problem and take remedial actions continues. Unit 1 RWST temperature is 77 F. Licensee is taking action to lower Unit 2 RWST temperature. The licensee notified the NRC Resident Inspector.
Unit 2 RWST temperature was verified at 97 degrees F at 1421 CDT. The 2T-13 RWST is operable and LCO 3.5.4.is now met. The Unit 2 power reduction was terminated at 20% reactor power. Current plans are to continue to cool down the RWST using station procedures that place the RWST on recirculation through the residual heat removal (RHR) heat exchanger with component cooling water (CCW) to cool the heat exchanger. Plans are in progress to return Unit 2 to full power on 09/18/07. A root cause evaluation is in progress to determine the specific cause of the event; however, preliminary investigations have determined that the heaters were on with an improper setpoint. The power supply to the heaters have been turned off and temperatures are being monitored on an hourly basis while the RWST is on recirculation. The licensee notified the NRC Resident Inspector. Notified R3DO (Peterson) |
| Where | |
|---|---|
Point Beach  Wisconsin (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-2.1 h-0.0875 days <br />-0.0125 weeks <br />-0.00288 months <br />) | |
| Opened: | Kile Hess 11:37 Sep 18, 2007 |
| NRC Officer: | John Knoke |
| Last Updated: | Sep 18, 2007 |
| 43649 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (53 %) |
WEEKMONTHYEARENS 503962014-08-24T05:00:00024 August 2014 05:00:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Post Accident Monitoring Instrumentation Out of Service ENS 464752010-12-13T18:10:00013 December 2010 18:10:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Not Meeting Rod Group Allignment Limits ENS 439072008-01-15T20:15:00015 January 2008 20:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unusual Event - Loss of Offsite Power ENS 436492007-09-18T13:43:00018 September 2007 13:43:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Refueling Water Storage Tank Temperature Above Operating Limits ENS 434242007-06-14T23:19:00014 June 2007 23:19:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec. Required Shutdown Due to 72 Hour Completion Time Not Met ENS 421092005-11-02T05:00:0002 November 2005 05:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Degradation of Containment Coatings ENS 414472005-02-27T17:58:00027 February 2005 17:58:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Loss of Dc Battery Chargers ENS 412122004-11-19T22:22:00019 November 2004 22:22:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to a Steam Leak on an Instrument Isolation Valve Inside Containment ENS 406262004-03-30T18:15:00030 March 2004 18:15:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Safety Injection Accumulator Level Greater than Allowed by Technical Specification 2014-08-24T05:00:00 | |