ENS 44849
ENS Event | |
|---|---|
17:30 Feb 12, 2009 | |
| Title | High Pressure Coolant Injection Suction Source Instrument Malfunction |
| Event Description | Unit 2 HPCI (High Pressure Coolant Injection) system is being considered inoperable due to the following information: (Condition Report 2009101257) The instrumentation associated with the automatic suction swap for Unit 2 HPCI was reviewed as a result of CR 2009100480 to confirm the set points that determine the condensate storage tank (CST) level at which the suction swap would occur. During the course of this review, the corporate design engineer contacted the level switch vendor to review the configuration of the level switches and to confirm the expected operation of the switches (2E41-N002 & 2E41-N003) given their configuration. Based on the configuration of the instrument lines and physical location of the level switches, the vendor reported that either liquid or gas would most likely be entrapped in the external cage of the Magnetrol level switches. This would prevent the instruments from performing their automatic swap function. Based on this information the 'as found' condition of the switches indicate that this condition has been present since the installation of the switches when implementing the DCP in 1991 which affects the operability of this instrumentation.
Even though the suction swap instrumentation on low CST level is considered inoperable, there is no apparent actual adverse impact on nuclear safety. However, the instrumentation is included in the Technical Specifications and its inoperability would make HPCI inoperable if it is aligned to the CST rather than being aligned to the suppression pool. The normal system alignment is with its suction source to the CST, therefore HPCI is being considered as inoperable. Until the configuration of the level switches has been addressed, these Magnetrol level switches must be considered inoperable, the appropriate Technical Specification RAS [Required Action Statement] will be entered and the suction source for HPCI should be aligned to the suppression pool when HPCI is required to be operable. This condition only applies to Unit 2. The licensee has notified the NRC Resident Inspector.
Event Report 44849 Retraction: On February 12, 2009, a condition was discovered where the physical location of level switches relied upon for automatically transferring the suction of the Unit 2 high pressure coolant injection (HPCI) system from the condensate storage tank (CST) to the suppression pool on low CST level did not meet the setpoints given in the Technical Specifications. Based on the information available at that time HPCI would have to be considered inoperable based on the fact that the affected instrumentation was inoperable and with HPCI aligned to the CST. Since the unit was shutdown HPCI was not required to be operable. After further review the determination has been made that at the time of discovery the 'as found' plant configuration associated with the suction swap setpoint for the Unit 2 high pressure coolant injection (HPCI) system could NOT have prevented the fulfillment of the safety function since the unit was in Cold Shutdown, and HPCI was not required to be operable. Based on this information this condition did not require an NRC notification in accordance with I0CFR50.72 and as such is being retracted through this update response. The condition will be reported in accordance with I0CFR50.73(a)(2)(v), The licensee has notified the NRC Resident Inspector. Notified R2DO (Sykes) |
| 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:+-0.57 h-0.0238 days <br />-0.00339 weeks <br />-7.80786e-4 months <br />) | |
| Opened: | Edwin Urquhart 16:56 Feb 12, 2009 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Mar 20, 2009 |
| 44849 - NRC Website
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Hatch with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
WEEKMONTHYEARENS 568962023-12-18T07:23:00018 December 2023 07:23:00
[Table view]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 2023-12-18T07:23:00 | |