ENS 42486
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ENS Event | |
|---|---|
15:55 Apr 10, 2006 | |
| Title | Personnel Air Lock Door Equalizing Valve Leaking by |
| Event Description | {{#Wiki_filter:It was reported to the Shift Manager this morning in Condition Report 200601444 that the inner Personnel Air Lock (PAL) door equalizing valve was leaking by. Although the condition was reported this morning, it was actually discovered following a containment entry on Friday, April 7, 2006. Fort Calhoun Station Technical Specification 2.6(1)b,(ii) states that with the PAL inoperable, except as the result of an inoperable air lock door, maintain at least one air lock door closed; restore the inoperable air lock to operable status within 24 hours or be in at least hot shutdown within the next six hours and in cold shutdown within the following thirty hours. The leak by past the inner air lock door is applicable to this Fort Calhoun Station Technical Specification. The Shift Manager determined at 10:00 CDT that Fort Calhoun was in excess of the Limiting Conditions for Operation of Technical Specification 2.6(1)b(ii) and entered Technical Specification 2.0.1 (Motherhood) which requires the unit to be placed in at least hot shutdown within six hours, in at least subcritical and less than 300�F within the next six hours, and at least cold shutdown within the following thirty hours, unless corrective measures are completed that permit operation under the permissible action requirements for the specified time interval as measured from initial discovery or until the reactor is placed in an operating mode in which the specification is not applicable.
At 10:55 CDT on April 10, 2006, a shutdown was commenced and negative reactivity was introduced to the core. At the same time, machinists were dispatched to troubleshoot the situation and found a loose collar on the valve assembly that was preventing full closure of the valve. The collar was adjusted and post-maintenance testing was completed. The inner PAL door equalizing valve was declared operable at 13:10 CDT. Technical Specifications 2.0.1 and 2.6(1)b(ii) were exited, the unit shutdown was ceased at a power level of 96.04% and preparations are being made to return the unit to full power. The licensee notified the NRC Resident Inspector. }} |
| Where | |
|---|---|
Ft Calhoun  Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-1.52 h-0.0633 days <br />-0.00905 weeks <br />-0.00208 months <br />) | |
| Opened: | Ken Kingston 14:24 Apr 10, 2006 |
| NRC Officer: | John Knoke |
| Last Updated: | Apr 10, 2006 |
| 42486 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (96 %) |
WEEKMONTHYEARENS 502142014-06-20T05:01:00020 June 2014 05:01:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 500382014-04-15T20:15:00015 April 2014 20:15:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Failure of Control Room Air Conditioning ENS 497042014-01-09T11:18:0009 January 2014 11:18:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Inoperable Raw Water Pumps. ENS 463682010-10-27T17:22:00027 October 2010 17:22:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unit Commenced Shutdown After Declaring Containment Spray Inoperable ENS 458282010-04-08T21:22:0008 April 2010 21:22:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Inoperable Steam Generator Inlet Isolation Valve ENS 448512009-02-13T21:26:00013 February 2009 21:26:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unusual Event - Engineering Analysis Requires Technical Specification Shutdown ENS 424862006-04-10T15:55:00010 April 2006 15:55:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Personnel Air Lock Door Equalizing Valve Leaking by 2014-06-20T05:01:00 | |
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