ENS 41931
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ENS Event | |
|---|---|
19:40 Aug 18, 2005 | |
| Title | |
| Event Description | This report is being made pursuant to 10CFR50.72(b)(3)(v)(D), Event or Condition that could have prevented fulfillment of a Safety Function needed to mitigate the consequences of an accident. During a scheduled 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> surveillance run of the 1B diesel generator, with the diesel generator paralleled to its associated Bus 143, an electrical fault occurred in the Division 3 AC system. This resulted in a trip of the normal System Auxiliary Feed breaker ACB 1432 to the bus. The diesel generator was manually tripped when it was subsequently identified that its associated cooling water pump was not running. With the 1B diesel generator tripped, the Division 3 AC system is de-energized. The consequence is a loss of the Unit 1 High Pressure Core Spray System. High Pressure Core Spray is a single train system that performs a safety function, and therefore, loss of the system is reportable as an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> ENS notification under SAF 1.8.
The required actions of Technical Specification 3.5.1 for the High Pressure Core Spray System were entered on 8/18/05 at 14:40 when the system was made inoperable. All other Emergency Core Cooling Systems are operable at this time. The High Pressure Core Spray system is also unavailable, and On Line Risk for Unit 1 is Yellow. The system has been quarantined, and an investigation is currently in progress to determine the cause of the electrical fault. Unit 2 is not affected by this event, and Unit 1 is in a 14 day LCO to repair the EDG. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Lasalle  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000373/LER-2005-004 |
| Time - Person (Reporting Time:+-0.62 h-0.0258 days <br />-0.00369 weeks <br />-8.49276e-4 months <br />) | |
| Opened: | Michael Fitzpatrick 19:03 Aug 18, 2005 |
| NRC Officer: | John Knoke |
| Last Updated: | Aug 18, 2005 |
| 41931 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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