ENS 41736
ENS Event | |
|---|---|
14:31 May 31, 2005 | |
| Title | Operation at Greater than Licensed Power Lever (106% Rated) Due to Recirc Pump Motor Generator Set Fault |
| Event Description | On Tuesday May 31, 2005, Limerick Unit 2 was operating at 100% power at 10:31 hours when the 2A Reactor Recirculation Motor-Generator speed increased to the high-speed stop. Reactor power increased to approximately 106% and three main steam bypass valves opened as designed to control pressure. Operators reduced power to 98% as directed by emergency operating procedures using the 2B Reactor Recirculation Pump.
This event caused thermal power to exceed the 100% rated maximum power level of 3458 megawatts thermal specified in section 2.C.(1.) of the Limerick Unit 2 operating license. Therefore, this event is being reported via ENS within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> with a written followup within 30 days as required by section 2.E of the Limerick Unit 2 operating license. The licensee stated that power level exceeded 100% for approximately 1 minute during the event transient. Both the mechanical and electrical overspeed stops on the MG set were actuated. The licensee reviewed the transient and it does not appear that any other thermal limits were exceeded and there is no indication of any affect on the core or the fuel. Although trouble-shooting of the problem is still in progress, the licensee currently believes that the event was caused by the MG set controller. The licensee plans to remain at approximately 97% power until the problem is resolved. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
| Limerick Pennsylvania (NRC Region 1) | |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+2.85 h0.119 days <br />0.017 weeks <br />0.0039 months <br />) | |
| Opened: | Ned Dennin 17:22 May 31, 2005 |
| NRC Officer: | Bill Huffman |
| Last Updated: | May 31, 2005 |
| 41736 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (98 %) |
WEEKMONTHYEARENS 564642023-02-16T12:05:00016 February 2023 12:05:00
[Table view]Other Unspec Reqmnt, 10 CFR 50.73(a)(1), Submit an LER 60 Day Notification for an Invalid Actuation of the Emergency Service Water System ENS 417362005-05-31T14:31:00031 May 2005 14:31:00 Other Unspec Reqmnt Operation at Greater than Licensed Power Lever (106% Rated) Due to Recirc Pump Motor Generator Set Fault ENS 414152005-02-17T05:00:00017 February 2005 05:00:00 Other Unspec Reqmnt Missing Calibration Source ENS 413462005-01-18T17:55:00018 January 2005 17:55:00 Other Unspec Reqmnt 24-Hour Condition of License Report for Potential Non-Compliance of the Fire Protection Program ENS 410432004-09-15T20:00:00015 September 2004 20:00:00 Other Unspec Reqmnt Potential Violation of License Condition - Operation Above Licensed Power Limit 2023-02-16T12:05:00 | |