ENS 49261
ENS Event | |
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01:28 Aug 10, 2013 | |
Title | |
Event Description | In 2010, Control Room Envelope testing was conducted to satisfy SR 3.7.10.5 (this surveillance testing is required each 6 years). At that time, as a prerequisite, the surveillance procedure contained a step to add water to two floor drain loop seals that penetrated the Control Room Envelope; this practice was determined to be unacceptable preconditioning. Because the 2010 surveillance test was the first performance of this surveillance, the unacceptable preconditioning resulted in the following: a never-performed surveillance, failure to meet the associated surveillance requirement, and an inoperable Control Room Envelope. At 2028 CDT the station entered LCO 3.7.10, Condition B.
The station has taken action to periodically add water to the loop seals; this practice validates the loop seals will remain full of water. This action ensures, through Engineering judgment, that the loop seals will perform their function and the Control Room Envelope will provide adequate protection to the plant operators. The NRC Resident Inspector was notified. The floor drains are located inside the control room envelope near the control room chillers. Prior to this report, filling the loop seal was performed sporadically. The loop seal is now filled daily.
On 9/10/13, the Tracer Gas Test of Control Room failed to meet its acceptance criteria for the surveillance test. The failure was due to three (3) doors with minor seal leaks and/or test uncertainty. The station is evaluating door repairs and test uncertainty. The actions for the test failure to offset the consequences of the inoperable Control Room Envelope have been modified to protect the operators with the use of SCBA's and Potassium Iodine (KI) in the event of a DBA. The NRC Resident Inspector was notified. The R3DO (Lipa) was notified. |
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:+-0.12 h-0.005 days <br />-7.142857e-4 weeks <br />-1.64376e-4 months <br />) | |
Opened: | Matthew Birkel 01:21 Aug 10, 2013 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Sep 10, 2013 |
49261 - 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 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (80 %) |
After | Power Operation (80 %) |
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 | |