ENS 46297
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ENS Event | |
|---|---|
21:16 Sep 30, 2010 | |
| Title | Unanalyzed Condition Due to Potential Flooding Via Condensate Drain Lines |
| Event Description | USAR Section 2.7.1.2, River Stage and Flow, states flooding protection against the 1,014 foot flood in the auxiliary building is provided by removable flood barriers and sandbagging. When required, these flood barriers are installed in openings leading to safety related equipment on the 1,007 foot and 1,011 foot floor elevations.
It has been identified that the condensation drains from the switchgear room's air handling units VA-87 and VA-88 (located in the auxiliary building), and the upper electrical penetration room's air handling units VA-85 and VA-86 (located in the auxiliary building), have no isolation valves or check valves to prevent backflow from the drain line's discharge in the turbine building basement. This means that flooding of the turbine building above approximately the 1011 foot elevation (floor level of the switchgear rooms) would result in water back-flowing via the drain lines into the switchgear rooms. River level is currently at the 999' 6" elevation and stable. Procedure changes are currently being developed to block the affected drain lines. River level has never reached the 1011 foot elevation at the facility. The licensee has notified the NRC Resident Inspector.
A further evaluation of the reported flooding issue determined that the flow into the switchgear rooms would be insufficient to affect the operability of safety related equipment in the auxiliary building; therefore, the incident could not have prevented fulfillment of a safety function nor could it have caused the inoperability of independent trains of safety related equipment. The situation does not constitute an unanalyzed condition. Therefore, this event is being retracted. The NRC Resident Inspector has been notified. Notified R4DO (Powers). |
| Where | |
|---|---|
Fort Calhoun  Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+0.38 h0.0158 days <br />0.00226 weeks <br />5.20524e-4 months <br />) | |
| Opened: | Scott Lindquist 21:39 Sep 30, 2010 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Nov 30, 2010 |
| 46297 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 522012016-08-25T20:23:00025 August 2016 20:23:00
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Guidance Not Adequate to Mitigate a Design Basis Flood ENS 478482011-10-06T18:44:0006 October 2011 18:44:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Waste Disposal System Class One Seismic Support Inoperable ENS 470882011-07-22T13:30:00022 July 2011 13:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fire Supression Pumps Inoperable ENS 469652011-06-16T17:30:00016 June 2011 17:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Additional Penetration Identified for Mitigation During Walkdown ENS 462972010-09-30T21:16:00030 September 2010 21:16:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Potential Flooding Via Condensate Drain Lines 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 454672009-10-26T15:50:00026 October 2009 15:50:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Pressurizer and Feedwater Storage Tank Level Indications Do Not Meet Appendix R Requirements ENS 429432006-10-28T22:09:00028 October 2006 22:09:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition ENS 429022006-10-12T22:30:00012 October 2006 22:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Steam Generator Instrumentation Nonconformance ENS 428962006-10-10T20:00:00010 October 2006 20:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Containment Spray Valve Mispositioned 2016-08-25T20:23:00 | |
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