ENS 49128
ENS Event | |
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21:15 Jun 17, 2013 | |
Title | Potential Unanalyzed Condition - Carbon Dioxide Fire Suppression System Does Not Meet Design Requirements |
Event Description | At approximately 1615 CDT on June 17, 2013, station personnel identified a potential unanalyzed condition based on the following:
The 1998 design calculation for the carbon dioxide fire suppression system protecting the Relay Room is in part based on an unverified leakage rate for the enclosure. Recent testing and subsequent calculations have found the room leakage rate is higher than the leakage rate specified in the 1998 design calculation. As such, more carbon dioxide would be required to meet design requirements. The minimum required level for the system storage tank would not currently provide two shots of carbon dioxide (design requirement) to suppress a fire. The minimum required quantity in the tank would be sufficient to provide one shot of carbon dioxide to suppress a fire; however, since this doesn't meet the design requirement, a continuous fire watch was initiated. The licensee notified the NRC Resident Inspector.
Further evaluation determined that the as-found configuration did not meet the minimum design requirements. However, the CO2 concentration was adequate to suppress a fire within the relay and cable spreading room. The licensee has notified the NRC Resident Inspector. Notified R3DO (Hills). |
Where | |
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Prairie Island ![]() Minnesota (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
Time - Person (Reporting Time:+-2.68 h-0.112 days <br />-0.016 weeks <br />-0.00367 months <br />) | |
Opened: | Wayne Eppen 18:34 Jun 17, 2013 |
NRC Officer: | Donald Norwood |
Last Updated: | Jul 16, 2013 |
49128 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (82 %) |
After | Power Operation (82 %) |
WEEKMONTHYEARENS 526382017-03-20T21:39:00020 March 2017 21:39:00
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