ENS 42510
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ENS Event | |
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14:00 Apr 19, 2006 | |
Title | Non-Conservative Cold Overpressure Limit Curves Discovered During Engineering Review |
Event Description | Cold overpressure limit curve utilized in the EMG (Emergency Guidelines) network including EMG F-0, Critical Safety Function Status Trees is incorrect and non-conservative. This could have resulted in some instances where the operator may have diagnosed a green path (no challenge) when a yellow (potential challenge) or orange path (severe challenge) actually existed. The consequence would have been failure to implement the correct functional restoration procedure.
This problem was found during an Engineering review. The problem had existed since 1999. The NRC Resident Inspector was notified of this event by the licensee.
The purpose of this notification is to retract a previous report made on 4/19/06 at 1113 hours0.0129 days <br />0.309 hours <br />0.00184 weeks <br />4.234965e-4 months <br /> (EN# 42510). Further evaluation revealed that a green path would not have been diagnosed instead of an orange path. The evaluation also concluded that this condition does not prevent the fulfillment of a safety function. The licensee informed the NRC Resident Inspector. Notified R4DO (Jones). |
Where | |
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Wolf Creek Kansas (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+-2.78 h-0.116 days <br />-0.0165 weeks <br />-0.00381 months <br />) | |
Opened: | James M. Kuras 11:13 Apr 19, 2006 |
NRC Officer: | John Mackinnon |
Last Updated: | May 17, 2006 |
42510 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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