ENS 48870
ENS Event | |
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04:44 Mar 31, 2013 | |
Title | Both Trains of Auxiliary Building Special Ventilation System Declared Inoperable |
Event Description | During testing of the Auxiliary Building Ventilation System it was discovered that the outlet damper of one of the normal make-up fans did not close. This created a non-closable opening in the Auxiliary Bldg Special Vent System (ABSVS) boundary of greater than 10 square feet and required entry into TS [Technical Specification] 3.7.12, Condition B, for two ABSVS trains inoperable due to inoperable ABSVS boundary. This is considered a potential loss of safety function to control the release of material.
The licensee has notified the NRC Resident Inspector.
This notification is being made to retract Event Notification#48870, which reported a non-closeable opening in the Auxiliary Building Special Vent System (ABSVS) boundary of greater than 10 square feet. This required entry into TS 3.7.12 Condition B for two ABSVS trains inoperable due to an inoperable ABSVS boundary. This was considered a potential loss of safety function to control the release of radioactive material. Engineering evaluation and analysis identified that there was not a loss of safety function because the ABSVS started on demand during the performance of SP 1172 and that the ABSVS Boundary never exceeded the Tech Spec value of 10 square feet per TS 3.7.12. Review of the work order for CD-34042 validated that the system would have performed its safety function during the failure of CD-34042. In the event of a Design Basis Accident the ABSVS would have received a signal to actuate, the system would have performed as designed and drawn a negative differential pressure in the Aux Bldg within 6 minutes with the identified opening of 9.62 square feet that was observed during the failure of CD-34042. The licensee 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:+10.38 h0.433 days <br />0.0618 weeks <br />0.0142 months <br />) | |
Opened: | Wayne Eppen 15:07 Mar 31, 2013 |
NRC Officer: | Howie Crouch |
Last Updated: | May 13, 2013 |
48870 - 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 %) |
Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Prairie Island with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
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 | |