ENS 50772
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ENS Event | |
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11:35 Jan 28, 2015 | |
Title | Residual Heat Removal Capability Affected by Valve Clearance |
Event Description | At 0535 CST on 1/28/15, control room staff identified that valve EJHV8716A, RHR A To SIS [Safety Injection System] Hot Leg Recirc Loops 2&3 [isolation valve], had been closed per clearance order C20-D-EJ-A-005 to support maintenance on the A RHR system. Closing valve EJHV8716A placed Wolf Creek in TS 3.0.3. At 0550 CST on 1/28/15, power was restored to valve EJHV8716A and the valve was opened, allowing the unit to exit from TS 3.0.3. Subsequent reviews of clearance order C20-D-EJ-A-005 identified that valve EJHV8809A had been energized and closed per direction of the clearance order. TS 3.0.3 was reentered at 0635 CST due to discovery of this condition. At 0650 CST, valve EJHV8809A was opened and deenergized allowing exit from TS 3.0.3.
The licensee notified the NRC Resident Inspector. |
Where | |
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Wolf Creek Kansas (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
LER: | 05000482/LER-2015-001 05000482/LER-2015-001 Personnel Error Causes Two Inoperable Residual Heat Removal Trains |
Time - Person (Reporting Time:+-2.65 h-0.11 days <br />-0.0158 weeks <br />-0.00363 months <br />) | |
Opened: | Seth Bell 08:56 Jan 28, 2015 |
NRC Officer: | Vince Klco |
Last Updated: | Jan 28, 2015 |
50772 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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