ENS 41780
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ENS Event | |
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13:23 Jun 16, 2005 | |
Title | Both Rhr Lpci Divisions Inoperable Due to Valve Failure |
Event Description | On June 16, 2005 at 0923 EDT, with the plant in Mode 1 at 100% reactor power, both divisions of Residual Heat Removal (RHR) were declared inoperable for the Low Pressure Coolant Injection (LPCI) mode of operation due to a failure of E1150-F017B, Division 2 LPCI Outboard Injection Valve. While performing the Division 2 RHR Pump & Valve Operability Surveillance following a planned Division 2 RHR system outage, E1150-F017B closed properly but failed to open during its required stroke time test. With this valve closed and unable to automatically open, LPCI injection into the RPV from both divisions of RHR would be prevented if LPCI Loop Select Logic selected the Division 2 loop for injection. Therefore, this failure rendered both divisions of RHR inoperable for the LPCI function. LCO 3.5.1.J was entered, which requires immediate entry into LCO 3.0.3. The cause of the failure was subsequently identified and E1150-F017B was returned to its normally open position. At 1146 EDT, Division 1 RHR was declared operable for the LPCI function, and LCO 3.5.1.J and LCO 3.0.3 were exited. The plant remained at 100% power throughout the event.
The NRC resident inspector has been notified. This report is being made pursuant to 10CFR 50.72(b)(3)(v)(D). |
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-2005-004 |
Time - Person (Reporting Time:+0.35 h0.0146 days <br />0.00208 weeks <br />4.7943e-4 months <br />) | |
Opened: | Mike Himebauch 13:44 Jun 16, 2005 |
NRC Officer: | Jeff Rotton |
Last Updated: | Jun 16, 2005 |
41780 - 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 %) |
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