ENS 50004
ENS Event | |
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11:00 Apr 7, 2014 | |
Title | Control Room Special Vent Boundary Inoperable |
Event Description | At approximately 0600 CDT on April 7, 2014, Units 1 and 2 Control Room Special Vent System (CRSVS) Boundary was declared inoperable when a Control Room door handle fell off. Air could be felt flowing through the hole, causing an opening in the Control Room Envelope (CRE) Boundary. An opening reduces the protection of the Control Room Envelope provided to the operators in the event of a Design Basis Accident. The CRSVS Boundary was declared Inoperable, which required entry into Technical Specifications (TS) LCO 3.7.10. Condition B, one or more CRSVS trains inoperable, in MODES 1, 2, 3, or 4. Actions were immediately initiated to implement mitigating actions. A Work Request (WR) was initiated to repair the door, and work is in progress to restore the Control Room Boundary to an operable condition.
This condition is reportable under 10CFR50.72(b)(3)(v)(C), Event or Condition that Could Have Prevented Fulfillment of a Safety Function. The plant remains safe, and this condition does not pose any additional risk to the public. Additionally, our defense in depth strategies are relied upon to take actions to protect the health and safety of the public. The licensee has notified the NRC Resident Inspector."
Engineering evaluation has determined that the door would still fulfill its safety function of maintaining the integrity of the Control Room Envelope while the door handle was broken. The Control Room Special Vent System Boundary remained operable with the door handle off, therefore, there was no loss of safety function. The licensee has notified the NRC Resident Inspector." Notified R3DO (Riemer). |
Where | |
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Prairie Island ![]() Minnesota (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
Time - Person (Reporting Time:+2.28 h0.095 days <br />0.0136 weeks <br />0.00312 months <br />) | |
Opened: | Gene Dammann 13:17 Apr 7, 2014 |
NRC Officer: | Steve Sandin |
Last Updated: | May 10, 2014 |
50004 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Prairie Island ![]() | |
WEEKMONTHYEARENS 508702015-03-07T17:55:0007 March 2015 17:55:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Containment Declared Inoperable Due to Containment Fan Coil Leak ENS 508082015-02-11T04:05:00011 February 2015 04:05:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Containment Declared Inoperable Due to Containment Fan Coil Leak ENS 506302014-11-20T16:22:00020 November 2014 16:22:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Containment Declared Inoperable Due to Containment Fan Coil Leak ENS 501232014-05-19T17:36:00019 May 2014 17:36:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Containment Declared Inoperable Due to Containment Fan Coil Leak ENS 500042014-04-07T11:00:0007 April 2014 11:00:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Control Room Special Vent Boundary Inoperable ENS 494952013-11-01T17:06:0001 November 2013 17:06:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Trains of Auxiliary Building Special Ventilation System Declared Inoperable ENS 492612013-08-10T01:28:00010 August 2013 01:28:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Inoperable Control Room Envelope ENS 488702013-03-31T04:44:00031 March 2013 04:44:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Trains of Auxiliary Building Special Ventilation System Declared Inoperable 2015-03-07T17:55:00 | |