ENS 44198
ENS Event | |
|---|---|
19:20 May 9, 2008 | |
| Title | Both Trains of Rhr Declared Inoperable |
| Event Description | On 05/09/2008, at 14:20 CDT, Technical Specification 3.5.3, Condition A, was entered when the 'A' Residual Heat Removal (RHR) Train was declared inoperable due to a gap in one of the 'A' Train Containment Recirculation Sump Strainer modules greater than 1/8 inch. At the time this condition was discovered, the 'B' RHR train was already inoperable for maintenance.
The Unit is in the process of being returned to service following completion of a Refueling Outage. The unit remained stable, in Mode 4, with the 'A' RHR Train inservice providing cooling for decay heat removal. Efforts to correct the gap in the 'A' Train Containment Recirculation Sump Strainer were commenced shortly after identification of this condition, and the condition was corrected and 'A' Train RHR returned to Operable status at 17:45 CDT. 'B' Train RHR is currently being restored following completion of maintenance. The Unit will remain in Mode 4 until the 'B' RHR train is restored to Operable status. Technical Specification 3.5.3 requires one Emergency Core Cooling System (ECCS) Train to be operable while in Mode 4. An operable ECCS train includes both an RHR Subsystem, and a Centrifugal Charging Pump (CCP) subsystem. The 'A' Train CCP Subsystem remained operable. The licensee notified the NRC Resident Inspector.
Wolf Creek further evaluated this condition and determined that the safety function of the containment sump was maintained under WCGS current licensing basis. Therefore the 'A' Residual Heat Removal (RHR) Train was not inoperable. Wolf Creek is retracting the notification made under 10CFR50.72(b)(3)(v)(B). The licensee notified the NRC Resident Inspector. Notified the R4DO (Bywater). |
| Where | |
|---|---|
Wolf Creek  Kansas (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| Time - Person (Reporting Time:+-0.13 h-0.00542 days <br />-7.738095e-4 weeks <br />-1.78074e-4 months <br />) | |
| Opened: | Terry Damashek 19:12 May 9, 2008 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Jul 1, 2008 |
| 44198 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Shutdown (0 %) |
| After | Hot Shutdown (0 %) |