ENS 43967
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ENS Event | |
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00:20 Feb 7, 2008 | |
Title | Train "a" 250 Vdc Cable Passes Through Train "B" Switchgear Room |
Event Description | On February 6, 2008 at 1920 hours0.0222 days <br />0.533 hours <br />0.00317 weeks <br />7.3056e-4 months <br />, Cook Nuclear Plant Engineering personnel identified an unanalyzed condition that has the potential to degrade plant safety. Specifically, a cable routing error in the original design for safety related Train 'A' 250 VDC was discovered. A short section of Train 'A' 250 VDC was found to pass through the Train 'B' 4kV switchgear room. This routing was discovered to exist in both units. The routing of the cabling presents the possibility that a fire could disable the remote control to both 4kV switchgear trains.
Local inspection identified no additional or supplementary fire barrier such as fire retardant wrapping. Compensatory measures (fire watch) have been established. In accordance with 10 CFR 50.72(b)(3)(ii) this condition is reportable as a condition that resulted in the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety. The licensee notified the NRC Resident Inspector. |
Where | |
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Cook Michigan (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
Time - Person (Reporting Time:+-4.02 h-0.168 days <br />-0.0239 weeks <br />-0.00551 months <br />) | |
Opened: | Randy Crane 20:19 Feb 6, 2008 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Feb 6, 2008 |
43967 - 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 %) |
WEEKMONTHYEARENS 525442017-02-04T01:24:0004 February 2017 01:24:00
[Table view]10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Unaccounted Loads in Safe Shutdown Analysis ENS 453612009-09-18T14:30:00018 September 2009 14:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Inoperability of Both Edg'S Due to Valve Found Out of Position ENS 439672008-02-07T00:20:0007 February 2008 00:20:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Train "a" 250 Vdc Cable Passes Through Train "B" Switchgear Room 2017-02-04T01:24:00 | |
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