ENS 47242
ENS Event | |
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05:04 Sep 6, 2011 | |
Title | Control Room Indication of Hpci Minimum Flow Valve Position Lost |
Event Description | On September 6, 2011 at approximately 0104 EDT during surveillance testing of the High Pressure Coolant Injection (HPCI) system, control room position indication was lost on the HPCI Minimum Flow Valve, E4150F012 as the valve was stroking closed following shutdown of HPCI. The Minimum Flow Valve main power fuses were checked (found blown) and replaced in accordance with plant procedures. During stroke time testing of E4150F012, control room position indication was again lost when the operator depressed the open pushbutton.
HPCI had been removed from service for quarterly surveillance testing at 2219 EDT September 5, 2011. The unplanned inoperability condition began at 0104 EDT when position indication was lost on the Minimum Flow Valve during system shutdown. The valve was locally verified closed to comply with the action of LCO 3.6.1.3 to isolate the penetration. A 14-day LCO was entered and back dated to the time that HPCI was removed from service for surveillance testing. This report is being made pursuant to 10 CFR 50.72(b)(3)(v)(D) as a condition that at the time of discovery could have prevented the fulfillment of a safety function needed to mitigate the consequences of an accident, based on loss of a single train safety system. RCIC was and has remained operable. The NRC Resident Inspector has been notified. The failure is currently under investigation. |
Where | |
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Fermi Michigan (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000341/LER-2011-001 |
Time - Person (Reporting Time:+0.83 h0.0346 days <br />0.00494 weeks <br />0.00114 months <br />) | |
Opened: | Greg Miller 05:54 Sep 6, 2011 |
NRC Officer: | Charles Teal |
Last Updated: | Sep 6, 2011 |
47242 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |