ENS 53617
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ENS Event | |
|---|---|
04:00 Sep 21, 2018 | |
| Title | High Pressure Coolant Injection System Inoperable |
| Event Description | On 9/21/18, at 1755 EDT, Peach Bottom Atomic Power Station Unit 3 declared the High Pressure Coolant Injection system [HPCI] inoperable due to an inoperable differential pressure indicating switch [DPIS]. The DPIS is used to isolate the HPCI system when there is a high steam line flow condition. Operations declared the HPCI system inoperable and entered Technical Specification 3.5.1 Condition C for HPCI being inoperable. Technical Specification 3.3.6.1 was also entered for HPCI instrumentation being inoperable. Other standby systems (Reactor Core Isolation Cooling and Low Pressure Emergency Core Cooling Systems) are OPERABLE.
HPCI is a single train system. Therefore, per NUREG-1022, this condition is being reported pursuant to 10CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of the safety function of a system required to mitigate the consequences of a design event. This condition has been entered into the corrective action program (IR 4175355). Investigation of the exact cause of the indication issue is in progress. The NRC Resident has been informed of this notification.
On 09/22/18 at 0955 EDT, RCS [Reactor Coolant System] pressure boundary leakage was identified as the cause of the HPCI high steam flow indication issue. Technical Specification 3.4.4 was entered which will require the initiation of a nuclear plant shutdown. This indicates a degradation of a principal safety barrier. Current Unit 3 reactor power is 35%. This condition is being reported pursuant to 10 CFR 50.72(b)(2)(i) and 50.72(b)(3)(ii). This condition is being tracked in the corrective action program (IR 4175355). The NRC Resident has been informed". Peach Bottom will be notifying State and local agencies regarding the event. Notified the R1DO (Greives). |
| Where | |
|---|---|
Peach Bottom  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
| Time - Person (Reporting Time:+18.07 h0.753 days <br />0.108 weeks <br />0.0248 months <br />) | |
| Opened: | Samij Patel 22:04 Sep 21, 2018 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Sep 22, 2018 |
| 53617 - NRC Website | |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Peach Bottom with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded | |
WEEKMONTHYEARENS 552242021-04-30T03:54:00030 April 2021 03:54:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) Declared Inoperable ENS 549712020-10-29T14:30:00029 October 2020 14:30:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Through-Wall Leakage Identified on Reactor Coolant System Pressure Boundary During Testing ENS 543302019-10-15T16:10:00015 October 2019 16:10:00 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 536172018-09-21T04:00:00021 September 2018 04:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded High Pressure Coolant Injection System Inoperable ENS 530312017-10-23T08:00:00023 October 2017 08:00:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Leakage Identified on One Inch Line Socket Weld for the B Recirculation Pump ENS 524782017-01-09T20:30:0009 January 2017 20:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Emergency Diesel Generators Non-Conforming with Licensing Basis for Tornado Generated Missiles ENS 524192016-12-09T03:37:0009 December 2016 03:37:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Surveillance Failure ENS 522642016-09-26T22:45:00026 September 2016 22:45:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Declared Inoperable ENS 516302015-12-31T11:30:00031 December 2015 11:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Inoperable ENS 505712014-10-29T15:20:00029 October 2014 15:20:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Maximum Allowable Primary Containment Leakage Rate Exceeded ENS 483762012-10-04T13:59:0004 October 2012 13:59:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Trains of Control Room Emergency Ventilation System Out of Service ENS 469872011-06-26T04:30:00026 June 2011 04:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Piping Leak Isolated on High Pressure Coolant Injection ENS 466772011-03-16T20:47:00016 March 2011 20:47:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Declared Inoperable ENS 452892009-08-24T18:15:00024 August 2009 18:15:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Station Safety Grade Pneumatic Supply Issue ENS 449262009-03-21T16:07:00021 March 2009 16:07:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable Following Failure of Valve to Fully Open During Surveillance Test ENS 449042009-03-12T20:20:00012 March 2009 20:20:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable ENS 442902008-06-12T04:40:00012 June 2008 04:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection (Hpci) System Identified Inoperable During Surveillance ENS 432382007-03-14T18:55:00014 March 2007 18:55:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable ENS 428892006-10-07T21:50:0007 October 2006 21:50:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Technical Specification Required Shutdown Due to Loss of Primary Containment Integrity ENS 424782006-04-05T20:15:0005 April 2006 20:15:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection Declared Inoperable (Hpci) ENS 420032005-09-20T09:00:00020 September 2005 09:00:00 10 CFR 50.72(b)(3)(ii)(A), Seriously Degraded Degraded Condition - Small Leak on Rhr Injection Drain Line ENS 416762005-05-07T01:36:0007 May 2005 01:36:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Degraded Pipe Restraint on Hpci Discharge Piping ENS 416382005-04-25T20:55:00025 April 2005 20:55:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable ENS 415102005-03-21T22:00:00021 March 2005 22:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci Declared Inoperable - Entering 14 Day Lco Action Statement ENS 414582005-03-03T23:25:0003 March 2005 23:25:00 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 411072004-10-09T05:15:0009 October 2004 05:15:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Coolant Injection System Condensate Storage Tank Suction Valve Failed to Auto-Close During Surveillance ENS 409732004-08-22T00:00:00022 August 2004 00:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Accident Mitigation - High Pressure Coolant Injection System Flow Controller Malfunction ENS 405932004-03-17T17:35:00017 March 2004 17:35:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 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 405762004-03-08T16:30:0008 March 2004 16:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Hpci System Inoperable Due to Failure of Torus Suction Valve to Fully Open ENS 403942003-12-16T20:40:00016 December 2003 20:40:00 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 403842003-12-10T23:00:00010 December 2003 23:00:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Reduction in Accident Mitigation Due to Improper Hpci Suction Transfer ENS 401982003-09-25T04:00:00025 September 2003 04:00:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.73(a)(1), Submit an LER Initiation of a Technical Specification Required Shutdown at Peach Bottom 2 2021-04-30T03:54:00 | |
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