ENS 43149
ENS Event | |
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20:15 Feb 6, 2007 | |
Title | |
Event Description | The Control Room Emergency Filtration System (CREFS) was declared inoperable at 1957 on 02/03/07 due to W-14B, 'F-16 Control Room Charcoal Filter Fan,' being declared inoperable during monthly Technical Specification surveillance testing. Upon subsequent investigation of the inoperability of the W-14B fan, the W-14A fan was declared inoperable at 1415 CST on 02/06/07. The cause of the failure of the fans is under investigation.
These fans are required to be operable to support operability of the CREFS System. This condition is covered by TS 3.7.9 'Control Room Emergency Filtration System' and both units have entered Action Condition A 'CREFS Inoperable,' with a Required Action to 'Restore CREFS to an OPERABLE Status' by 1957 CST on 02/10/07. Although the W-14 fans are redundant, CREFS is a single train system. Based on the guidance in NUREG-1022 for single train systems that perform safety functions, this condition was determined to be reportable under 10 CFR 50.72(b)(3)(v)(D), 'Event or Condition That Could Have Prevented Fulfillment of a Safety Function.' Additionally, the failure places PBNP CREFS in a degraded condition that significantly affects plant safety under 50.72(b)(3)(ii)(A), 'Degraded or Unanalyzed Condition.' The licensee notified the NRC Resident Inspector. |
Where | |
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Point Beach ![]() Wisconsin (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000266/LER-2007-001 |
Time - Person (Reporting Time:+-1.12 h-0.0467 days <br />-0.00667 weeks <br />-0.00153 months <br />) | |
Opened: | Eric Schultz 19:08 Feb 6, 2007 |
NRC Officer: | Bill Huffman |
Last Updated: | Feb 6, 2007 |
43149 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |