ENS 52543
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ENS Event | |
|---|---|
16:51 Feb 8, 2017 | |
| Title | High Pressure Coolant Injection System Inoperable Due to Degraded Dc to Ac Inverter |
| Event Description | During a control room panel walk down by an on-shift Reactor Operator at approximately 1151 [EST] on 2/8/2017, Unit 1 High Pressure Coolant Injection (HPCI) suction and discharge pressure indicators were noted to be downscale. I & C investigated and found the output of 1E41K603, DC to AC inverter, degraded. This inverter also powers the HPCI flow controller. Without the flow controller HPCI would not auto-start to mitigate the consequences of an accident, thus HPCI was declared inoperable. All other emergency core cooling systems and the Reactor Core Isolation Cooling (RCIC) system remain operable.
HPCI is a single train system with no redundant equipment in the same system, thus this failure is reportable as an event or condition that could have prevented fulfillment of a safety function needed to mitigate the consequences of an accident, 10CFR50.72(b)(3)(v)(D). Inverter 1E41K603 was replaced and functionally tested satisfactorily at 1630 on 2/8/2017, restoring HPCI to operable status. The NRC Resident Inspector was notified. |
| Where | |
|---|---|
Hatch  Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+0.67 h0.0279 days <br />0.00399 weeks <br />9.17766e-4 months <br />) | |
| Opened: | Jason Wiggins 17:31 Feb 8, 2017 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Feb 8, 2017 |
| 52543 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Hatch with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
WEEKMONTHYEARENS 577412025-06-04T01:37:0004 June 2025 01:37:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unit 1 HIGH-PRESSURE Coolant Injection Inoperable ENS 568962023-12-18T07:23:00018 December 2023 07:23:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Inoperable ENS 554482021-09-08T05:59:0008 September 2021 05:59:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unit 1 High Pressure Coolant Injection (HPCI) System Inoperable ENS 546772020-04-22T14:15:00022 April 2020 14:15:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System (Hpci) Inoperable ENS 542372019-08-23T02:34:00023 August 2019 02:34:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) System Inoperable ENS 539442019-03-19T05:40:00019 March 2019 05:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Inoperable ENS 525432017-02-08T16:51:0008 February 2017 16:51:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Inoperable Due to Degraded Dc to Ac Inverter ENS 500802014-05-02T00:45:0002 May 2014 00:45:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Loss of Hpci Operability Due to Water Accumulation in the Hpci Turbine ENS 488272013-03-18T13:10:00018 March 2013 13:10:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Inoperable Following Refueling Outage ENS 455412009-12-05T15:59:0005 December 2009 15:59:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Out of Service Due to the Loss of the Suction Auto-Swap Function ENS 448492009-02-12T17:30:00012 February 2009 17:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Suction Source Instrument Malfunction ENS 438842008-01-06T16:00:0006 January 2008 16:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable Due to Failed Surveillance Test ENS 433742007-05-18T21:45:00018 May 2007 21:45:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Inoperable Hpci Pump ENS 432422007-03-15T19:32:00015 March 2007 19:32:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable During Startup Testing ENS 432212007-03-08T01:50:0008 March 2007 01:50:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable Following Surveillance Testing ENS 431532007-02-08T09:32:0008 February 2007 09:32:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) System Inoperable ENS 431522007-02-07T21:40:0007 February 2007 21:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolent Injection (Hpci) Declared Inoperable ENS 429142006-10-17T15:21:00017 October 2006 15:21:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Accident Mitigation - Hpci System Inoperable ENS 426572006-06-21T04:15:00021 June 2006 04:15:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) Declared Inoperable Due Excessvie Aux Oil Pump Motor Current ENS 425782006-05-16T13:38:00016 May 2006 13:38:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Inoperable Due to Hpci Discharge Check Valve Body Leak ENS 422622006-01-16T23:31:00016 January 2006 23:31:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci System Isolated Due to Atts Card Failure ENS 408242004-06-17T09:21:00017 June 2004 09:21:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) Declared Inoperable 2025-06-04T01:37:00 | |
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