ENS 45525
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ENS Event | |
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04:05 Nov 28, 2009 | |
Title | Turbine Valve Trips Did Not Meet Tech Specs |
Event Description | At 2205 on Nov 27, 2009, at the Dresden Nuclear Power Station (DNPS) it was determined that Technical Specification RPS functions 8 and 9, 'Turbine Stop Valve - Closure' and 'Turbine Control Valve Fast Closure, Trip Oil Pressure - Low' are susceptible to single point vulnerability due to a nonconformance to a design standard (IEEE- 279 1968). Based on this single point vulnerability, these RPS functions could potentially have prevented the fulfillment of their respective safety function and therefore this event is reportable per 10 CFR 50.72(b)(3)(v)(D), 'an event or condition that could have prevented the fulfillment of a safety function-mitigate the consequences of an accident.' The station has performed an operability determination, and the safety function remains operable. Actions to restore compliance to referenced design standard are in progress.
The licensee has informed the NRC Resident Inspector. |
Where | |
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Dresden Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+-0.83 h-0.0346 days <br />-0.00494 weeks <br />-0.00114 months <br />) | |
Opened: | Bruce Farnzen 03:15 Nov 28, 2009 |
NRC Officer: | Charles Teal |
Last Updated: | Nov 28, 2009 |
45525 - NRC Website
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Unit 3 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (98 %) |
After | Power Operation (98 %) |
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