ENS 42557
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ENS Event | |
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21:00 May 5, 2006 | |
Title | Potential Loss of Rhr |
Event Description | At 1600 CST on May 5, 2006, the Kewaunee Power Station (KPS) declared both trains of Residual Heat Removal (RHR) inoperable due to a vulnerability to internal flooding caused by possible ruptures of non-seismically qualified piping during a seismic event. Since the KPS RHR system is not protected from non-seismically induced piping breaks in the auxiliary building basement KPS does not presently meet the design criteria in the KPS USAR for the RHR system. The specific design criteria is stated in USAR section B.5 'Protection of Class I Items' and states that Class I items are protected against damage from 'Rupture of a pipe or tank resulting in serious flooding or excessive steam release to the extent that the Class I function is impaired.'
With KPS in Intermediate Shutdown and both trains of RHR inoperable, KPS meets the Technical Specification requirement for Decay Heat Removal Capability with two (2) Steam Generators operable to remove decay heat. This event is being reported under 10CFR50.72(b)(3)(v)(B) for 'Any event that at the time of discovery could have prevented the fulfillment of the safety function of systems that are needed to remove residual heat.' The licensee notified the NRC Resident Inspector. |
Where | |
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Kewaunee Wisconsin (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
LER: | 05000305/LER-2006-003 |
Time - Person (Reporting Time:+1.92 h0.08 days <br />0.0114 weeks <br />0.00263 months <br />) | |
Opened: | Tim Bunkelman 22:55 May 5, 2006 |
NRC Officer: | Bill Gott |
Last Updated: | May 5, 2006 |
42557 - NRC Website
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Unit 1 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Intermediate Shutdown (0 %) |
After | Intermediate Shutdown (0 %) |
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