ENS 42548
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ENS Event | |
|---|---|
12:00 May 3, 2006 | |
| Title | Loss of Response Capability - Technical Support Center (Tsc) |
| Event Description | This report is being made pursuant to 10CFR50.72(b)(3)(xiii), 8-hour Non-Emergency Report due to the loss of off-site response capability. As of 0700 Central Daylight Savings Time on 5/03/2006 the TSC was declared non-functional due to the discovery of non-conservative surveillance acceptance criteria for the TSC ventilation system flow balance. The acceptance criteria allow for a higher percentage of pressurization flow from filtered outside air and lower recirculation flow than is supported by the radiological consequences analysis for the TSC. This condition is complicated by the fact that the radiological consequences analysis has not been updated to incorporate changes to plant operation and radiological source term derived from the current license basis Loss of Coolant Accident analysis. Preliminary evaluations using current plant configuration, current TSC ventilation flow balance values, and current calculation methodology indicate that post-accident dose to TSC personnel is approximately 31.7 Rem to the thyroid, exceeding the acceptance criterion of 30 Rem.
Activities to revise applicable surveillance acceptance criteria and restore TSC functionality by re-balancing TSC ventilation flows to establish acceptable dose consequences have been initiated and are expected to be complete by 2000 on 5/3/2006. Affected Emergency Response Organization members have been instructed on compensatory measures in place until the TSC is fully functional. Callaway Plant is currently operating in Mode 1 at 100% power. Normal plant operation is unaffected by the partial loss of TSC function. The licensee has notified the NRC Resident Inspector.
TSC ventilation flow balancing activities to restore TSC functionality have been completed. The TSC was declared functional and restored to service at 1930 CDT on 5/3/06. The licensee will inform the NRC Resident Inspector. Notified R4DO (Bywater). |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+1.92 h0.08 days <br />0.0114 weeks <br />0.00263 months <br />) | |
| Opened: | David Lantz 13:55 May 3, 2006 |
| NRC Officer: | Bill Gott |
| Last Updated: | May 3, 2006 |
| 42548 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 532032018-02-12T10:12:00012 February 2018 10:12:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Ventilation Identified During Technical Support Center Test ENS 516492016-01-12T18:53:00012 January 2016 18:53:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Ventilation System to Emergency Off-Site Facility ENS 493982013-10-01T03:57:0001 October 2013 03:57:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Off-Site Emergency Operations Facility Declared Inoperable Due to Air In-Leakage ENS 484422012-10-25T14:30:00025 October 2012 14:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Emergency Assessment During Planned Modifications ENS 482452012-08-28T20:00:00028 August 2012 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Determined to Be Non-Functional Due to Low Recirc Flow ENS 481122012-07-17T16:40:00017 July 2012 16:40:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Non-Functional Due to Degraded Charcoal Adsorber ENS 479302012-05-17T09:38:00017 May 2012 09:38:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Non-Functional Due to Failed Return Fan ENS 477492012-03-11T19:30:00011 March 2012 19:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Backup Diesel Generator Declared Non-Functional ENS 473152011-10-03T13:50:0003 October 2011 13:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Maintenance ENS 472912011-09-25T23:04:00025 September 2011 23:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Technical Support Center Out of Service for Planned Maintenance ENS 465812011-02-01T20:30:0001 February 2011 20:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Severe Weather Conditions ENS 461562010-08-05T20:00:0005 August 2010 20:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of All Power and Emergency Response Function at the Technical Support Center Due to Scheduled Maintenance ENS 454272009-10-12T09:00:00012 October 2009 09:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Inoperable Due to Loss of Ventilation ENS 443812008-08-04T14:46:0004 August 2008 14:46:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Planned Loss of Erds for Process Computer Upgrade ENS 436112007-08-31T12:03:00031 August 2007 12:03:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Response Capability - Tsc Support Center (Tsc) Due to Planned Electrical Maintenance ENS 435612007-08-13T15:00:00013 August 2007 15:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Ventilation Inoperable ENS 430172006-12-01T12:30:0001 December 2006 12:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Plant Access ENS 425482006-05-03T12:00:0003 May 2006 12:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Response Capability - Technical Support Center (Tsc) ENS 424972006-04-13T12:38:00013 April 2006 12:38:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Capability - Technical Support Center (Tsc) ENS 417772005-06-15T13:02:00015 June 2005 13:02:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Offsite Facility Declared Inoperable Due to Air Filtration Fan Failure to Start ENS 413292005-01-13T11:04:00013 January 2005 11:04:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Offsite Communications and Ens ENS 413072005-01-04T18:30:0004 January 2005 18:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Site Had 86.2% of Their Emergency Alert Sirens Inoperable ENS 412912004-12-24T15:27:00024 December 2004 15:27:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Response Capability - Emergency Offsite Facility ENS 411912004-11-11T10:10:00011 November 2004 10:10:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Offsite Facility Declared Inoperable Due to Ventilation Failure ENS 408892004-07-21T16:55:00021 July 2004 16:55:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Eof Declared Inoperable Due to Unacceptable Air Flow Rates in Filtration Mode ENS 408612004-07-10T10:59:00010 July 2004 10:59:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Communication at the Technical Support Center Due to Scheduled Maintenance ENS 404622004-01-21T18:30:00021 January 2004 18:30:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Notification Siren Temperature Sensitivity 2018-02-12T10:12:00 | |
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