ENS 43680
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ENS Event | |
|---|---|
03:20 Oct 2, 2007 | |
| Title | Loss of Exhaust Ventilation Stack Flow and Accident Radiation Monitors Due to Plant Data Multiplexer Failure |
| Event Description | On 10/01/2007 the failure of a plant data multiplexer (MUX) resulted in the loss of Control Room indication of all plant building exhaust ventilation stack flows and accident radiation monitors. The stack flows and accident radiation monitors are normally accessed by the plants Emergency Response Organization offsite dose calculation application but cannot be accessed at this time. Alternate means of offsite dose projections are available. The duration of the plant data MUX outage is currently unknown. Follow-up notification will be made after restoration of the plant data MUX.
The cause of the failure is being investigated. The licensee notified the NRC Resident Inspector.
The licensee reports that the plant data multiplexer (MUX) has been returned to service. A faulty off-gas building channel (Offgas / Radwaste Building AXM/SPING/FMIS) was the cause of the MUX failure. The off-gas channel remains out of service. The licensee notified the NRC Resident Inspector. R4DO (Nease) notified. |
| Where | |
|---|---|
Grand Gulf  Mississippi (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+1.13 h0.0471 days <br />0.00673 weeks <br />0.00155 months <br />) | |
| Opened: | Hardy Farris 04:28 Oct 2, 2007 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Oct 3, 2007 |
| 43680 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 529212017-08-23T08:40:00023 August 2017 08:40:00
[Table view]10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Offsite Telephone Lines ENS 513212015-08-03T14:00:0003 August 2015 14:00:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Sirens Due to Loss of Power ENS 450362009-05-02T05:02:0002 May 2009 05:02:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Power Interruption ENS 436802007-10-02T03:20:0002 October 2007 03:20:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Exhaust Ventilation Stack Flow and Accident Radiation Monitors Due to Plant Data Multiplexer Failure ENS 436192007-09-06T21:05:0006 September 2007 21:05:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Eof Declared Non-Operational ENS 429402006-10-27T14:15:00027 October 2006 14:15:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Operations Facility Non Operational Due to Planned Maintenance ENS 420112005-09-25T02:21:00025 September 2005 02:21:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Weather Related Loss of Emergency Sirens ENS 419612005-08-29T22:45:00029 August 2005 22:45:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Emergency Response Data System (Erds) Was Out of Service for Approximately 20 Minutes ENS 419592005-08-29T17:18:00029 August 2005 17:18:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Partial Loss of Emergency Sirens Associated with Hurricane Katrina ENS 408132004-06-14T11:26:00014 June 2004 11:26:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Failed Data Server for Emergency Response Data System ENS 401102003-08-28T12:50:00028 August 2003 12:50:00 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Power to Emergency Operations Facility 2017-08-23T08:40:00 | |
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