ENS 48503
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ENS Event | |
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21:51 Nov 12, 2012 | |
Title | Reactor Building Isolation with Standby Gas Treatment System Actuation During Radioactive Material Move |
Event Description | At 1551 EST on 11/12/12, the 'A' Refuel Floor Process Radiation Monitor reached 62 mR/hr during movement of the old steam dryer in the plant reactor building. This resulted in the isolation of the drywell containment air monitor and the oxygen analyzer primary containment isolation valves. The signal also resulted in a reactor building isolation (Secondary Containment), start of 'A' Standby Gas Treatment, and transfer of the control room ventilation to the High Radiation Mode.
All automatic isolation valves have been reset. Reactor building and control room ventilation have been reset. Standby gas treatment has been secured. There were no challenges to the health and safety of the general public. The NRC Resident Inspector has been notified. |
Where | |
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Monticello Minnesota (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
Time - Person (Reporting Time:+-0.98 h-0.0408 days <br />-0.00583 weeks <br />-0.00134 months <br />) | |
Opened: | Matthew Quick 20:52 Nov 12, 2012 |
NRC Officer: | Howie Crouch |
Last Updated: | Nov 12, 2012 |
48503 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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