ENS 44379
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ENS Event | |
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18:45 Jul 31, 2008 | |
Title | Postulated High-Energy Line Break That Could Disable Both Trains of Component Cooling |
Event Description | At 1345 Prairie Island staff declared both trains of Unit 2 Component Cooling (CC) system inoperable due to discovery that a postulated high energy line break (HELB) in the Turbine Building that could fail a CC line in the turbine building that would affect both trains of CC. The inoperability of Unit 2 CC caused entry into Technical Specification LCO 3.0.3. The CC line in question is not automatically isolated on a safety injection signal and the loss of CC inventory would eventually affect both trains of CC. Since a Unit 2 HELB could directly result in a loss of both trains of CC (a system that is required to meet the single failure criterion), the CC system does not meet the single failure criterion in the as-found configuration. Thus, in accordance with the guidance in NUREG 1022, this condition is reportable per 10 CFR 50.72(b)(3)(ii).
The CC line in the Turbine Building was isolated at 1614 on 7/31/08 returning Unit 2 CC to operable status. Unit 2 remained at 100% power. The isolated line went to a chemistry lab cooler that can be isolated during operation. The condition was discovered during a high-energy line break vulnerability walk-down. A similar line on Unit 1 was already isolated. The NRC Resident Inspector has been notified. |
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:+3.23 h0.135 days <br />0.0192 weeks <br />0.00442 months <br />) | |
Opened: | Mark Jenkin 21:59 Jul 31, 2008 |
NRC Officer: | Bill Huffman |
Last Updated: | Jul 31, 2008 |
44379 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 526382017-03-20T21:39:00020 March 2017 21:39:00
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