ENS 55385
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ENS Event | |
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23:51 Jul 29, 2021 | |
Title | |
Event Description | At 0922 PDT, on 07/28/21, the reactor building roof hatch was opened to support maintenance activities on the roof. Secondary containment differential pressure lowered and was recovered by the operating crew. Secondary containment differential pressure was maintained negative during the transient and was verified to have met technical specification requirements the whole time, however it was not identified at the time that the secondary containment was inoperable due to the roof hatch exceeding the allowable containment breech size and as such a TS 3.6.4.1.A entry was warranted.
This report is being made pursuant to 10 CFR 50.72(a)(1)(ii) when it was identified that the secondary containment was inoperable while the roof hatch was open and a report should have been made under 10 CFR 50.72(b)(3)(v)(C) and (D) for loss of safety function. There were no radiological releases, system actuations, or isolations associated with this event. The licensee has notified the NRC Resident Inspector. |
Where | |
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Columbia ![]() Washington (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000397/LER-2021-001 Breach of Secondary Containment |
Time - Person (Reporting Time:+0.42 h0.0175 days <br />0.0025 weeks <br />5.75316e-4 months <br />) | |
Opened: | Tracy Howard 00:16 Jul 30, 2021 |
NRC Officer: | Bethany Cecere |
Last Updated: | Jul 30, 2021 |
55385 - NRC Website
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Unit 2 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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