ENS 53067
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ENS Event | |
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09:03 Nov 12, 2017 | |
Title | Containment Spray Pump Control Switches Out of Service |
Event Description | At 2119 [CST] on 11/12/2017 a Control Room board walk down discovered that both of the Unit 2 Containment Spray Pump control switches were in pull-out. With the control switches in pull-out, the pumps would not automatically start as required. Unplanned TS [Technical Specifications] 3.0.3 was entered at 2119 as a result of not complying with TS 3.6.5, Containment Spray and Cooling Systems, which requires both trains of Containment Spray to be Operable while in Mode 4. Unit 2 had entered Mode 4 at 0303 on 11/12/2017. TS 3.0.3 was exited at 2127 on 11/12/2017 when both Containment Spray Pump control switches were placed in Automatic restoring Operability. Preliminary investigation determined that while Unit 2 was in Mode 5, Surveillance SP 2099, Main Steam Isolation Valve Logic Test, had taken the Containment Spray Pump control switches to pull-out but did not re-align the control switches to automatic after the test was complete. This 8-hour Non-Emergency report is being made per 10 CFR 50.72(b)(3)(v)(D), Accident Mitigation. The NRC Senior Resident Inspector has been informed. |
Where | |
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Prairie Island Minnesota (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:+18.9 h0.788 days <br />0.112 weeks <br />0.0259 months <br />) | |
Opened: | Brian Johnson 03:57 Nov 13, 2017 |
NRC Officer: | Vince Klco |
Last Updated: | Nov 13, 2017 |
53067 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Not Critical |
Scram | No |
Before | Hot Shutdown (0 %) |
After | Hot Shutdown (0 %) |
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