ENS 44062
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ENS Event | |
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18:45 Mar 13, 2008 | |
Title | Reactor Building to Torus Vacuum Breaker Pressure Switches May Not Perform Design Function |
Event Description | March 13, 2008 at 1445 hours0.0167 days <br />0.401 hours <br />0.00239 weeks <br />5.498225e-4 months <br />, engineering analysis identified that the pressure switches that operate to open the Reactor Building (RB) to Suppression Chamber (Torus) vacuum breaker isolation valves would not perform their design function. The condition impacted the function of both RB to Torus vacuum breaker isolation valves. One vacuum breaker isolation valve has been opened to maintain the function of the vacuum breaker in that line. A plan is being implemented to correct the deficiency and is expected to be completed within the required 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Limiting Condition for Operation expiration time for the current condition. This is being reported in accordance with 10 CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of the safety function of structures or systems needed to mitigate the consequences of an accident.
The licensee informed the NRC Resident Inspector. |
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-2008-002 |
Time - Person (Reporting Time:+-0.35 h-0.0146 days <br />-0.00208 weeks <br />-4.7943e-4 months <br />) | |
Opened: | D. Duncan / M. Himebauch 18:24 Mar 13, 2008 |
NRC Officer: | Bill Huffman |
Last Updated: | Mar 13, 2008 |
44062 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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