ENS 54188
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ENS Event | |
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14:14 Jul 30, 2019 | |
Title | Unplanned High Pressue Coolant Injection Inoperability |
Event Description | On July 30, 2019, at 1014 EDT, the Division 2 Mechanical Draft Cooling Tower (MDCT) Fan D was declared inoperable due to a trip of the fan while placing in it high speed. The MDCT Fans are required to support operability of the Ultimate Heat Sink (UHS). The UHS is required to support operability of the Division 2 Emergency Equipment Cooling Water (EECW) system. The EECW system cools various safety related components, including the High Pressure Coolant Injection (HPCI) system room cooler. An unplanned HPCI inoperability occurred based on a loss of the HPCI Room Cooler. Investigation revealed that a high speed breaker control power fuse had blown. The control power fuse was replaced, the MDCT Fan D was tested satisfactorily, and HPCI was declared operable at 1431 EDT. This report is being made pursuant to 10 CFR 50.72(b)(3)(v)(D) based on an unplanned HPCI inoperability.
The licensee has notified the NRC Senior Resident Inspector |
Where | |
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Fermi Michigan (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+1.47 h0.0613 days <br />0.00875 weeks <br />0.00201 months <br />) | |
Opened: | Ethan Hauser 15:42 Jul 30, 2019 |
NRC Officer: | Andrew Waugh |
Last Updated: | Jul 30, 2019 |
54188 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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