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On March 20, 2020, at 1025 hours (CDT), Un … On March 20, 2020, at 1025 hours (CDT), Unit 2 MCC (motor control center) 28/29-5 failed to transfer to its alternate feed during surveillance testing. This would result in MCC 28/29-5 being de-energized in the event of a DBA LOCA (design basis accident loss of coolant accident) in which the Unit 1 Emergency Diesel Generator fails to energize Bus 29. Consequently, the LPCI (low pressure coolant injection) Injection Valve (MO 2-1001-29A/B) would not have power to open on the loop selected by LPCI Loop Select. This renders both divisions of the LPCI mode of Residual Heat Removal system inoperable. Technical Specification 3.5.1, Condition E had previously been entered during testing, requiring restoration of LPCI in 72 hours. No other ECCS (emergency core cooling) systems were inoperable at the time of the event. Troubleshooting and repairs are in progress.</br>This event is reportable under 10 CFR 50.72(b)(3)(v)(D) as an event or condition that could have prevented fulfillment of a safety function.</br>The plant is still in its 72-hr. LCO action statement.</br>The licensee has notified the NRC Resident Inspector and the state of Illinois Emergency Management Agency.e of Illinois Emergency Management Agency. +
15:25:00, 20 March 2020 +
54,594 +
17:47:00, 20 March 2020 +
15:25:00, 20 March 2020 +
On March 20, 2020, at 1025 hours (CDT), Un … On March 20, 2020, at 1025 hours (CDT), Unit 2 MCC (motor control center) 28/29-5 failed to transfer to its alternate feed during surveillance testing. This would result in MCC 28/29-5 being de-energized in the event of a DBA LOCA (design basis accident loss of coolant accident) in which the Unit 1 Emergency Diesel Generator fails to energize Bus 29. Consequently, the LPCI (low pressure coolant injection) Injection Valve (MO 2-1001-29A/B) would not have power to open on the loop selected by LPCI Loop Select. This renders both divisions of the LPCI mode of Residual Heat Removal system inoperable. Technical Specification 3.5.1, Condition E had previously been entered during testing, requiring restoration of LPCI in 72 hours. No other ECCS (emergency core cooling) systems were inoperable at the time of the event. Troubleshooting and repairs are in progress.</br>This event is reportable under 10 CFR 50.72(b)(3)(v)(D) as an event or condition that could have prevented fulfillment of a safety function.</br>The plant is still in its 72-hr. LCO action statement.</br>The licensee has notified the NRC Resident Inspector and the state of Illinois Emergency Management Agency.e of Illinois Emergency Management Agency. +
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00:00:00, 20 March 2020 +
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16:48:42, 15 January 2021 +
17:47:00, 20 March 2020 +
0.0988 d (2.37 hours, 0.0141 weeks, 0.00325 months) +
15:25:00, 20 March 2020 +
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