ENS 50722
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ENS Event | |
|---|---|
12:00 Jan 8, 2015 | |
| Title | Technical Specification Required Shutdown Due to Loss of Both Channels of Refueling Water Storage Tank Instrumentation |
| Event Description | At 0400 [EST], Indian Point Unit 3 entered LCO 3.5.4 Condition C due to both Refueling Water Storage Tank (RWST) Low Low Level Alarm channels failing. The failure was a result of freezing in the instrument lines. LCO 3.5.4 Condition C requires at least one channel of RWST Low Low Level Alarm be restored to Operable within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. At 0500, Unit 3 entered Condition D due to the required action and completion time of Condition C not being met. This requires the unit be placed in Mode 3 in 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and Mode 4 in 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. This failure also has resulted in a loss of safety function. Operators rely upon the RWST Low Low Level Alarms during an accident to alert them of the need to transfer injection from the RWST as a source of water to the containment sump. At 0700, Indian Point Unit 3 commenced a shutdown to be in compliance with the requirements of LCO 3.5.4 Condition D. Investigation and repair efforts were immediately put in place to correct the failure and return the function to operable. At 1000, one Channel of RWST Low Low Level Alarm was returned to operable. LCO 3.5.4 Conditions C & D were exited. The shutdown was stopped and safety function was restored. Unit 3 remains in a 7-day shutdown [LCO action statement] for one RWST Low Low Level Alarm Channel inoperable as per LCO 3.5.4 Condition B.
Unit 2 is unaffected and remains at 100% power. The State of New York and the NRC Resident Inspector were notified. |
| Where | |
|---|---|
Indian Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000286/LER-2015-001 |
| Time - Person (Reporting Time:+-1.85 h-0.0771 days <br />-0.011 weeks <br />-0.00253 months <br />) | |
| Opened: | Luke Hedges 10:09 Jan 8, 2015 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Jan 8, 2015 |
| 50722 - NRC Website | |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (45 %) |
Indian Point 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 | |
WEEKMONTHYEARENS 536992018-10-28T04:00:00028 October 2018 04:00:00
[Table view]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 Non Essential Service Water Inoperable ENS 535892018-09-07T04:00:0007 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 Technical Specification Required Shutdown ENS 527512017-05-14T13:30:00014 May 2017 13:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Single Flow Barrier Access Point Found Unbolted ENS 522542016-09-21T06:21:00021 September 2016 06:21:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Discharge Check Valve Failure to Seat Causes Trip of Component Cooling Water Pump ENS 522242016-09-06T17:47:0006 September 2016 17:47:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Non-Essential Service Water Header Declared Inoperable ENS 520392016-06-24T08:00:00024 June 2016 08:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Ts Required Shutdown Due to Leaking Service Water Weld on Ccw Hx ENS 507222015-01-08T12:00:0008 January 2015 12:00:00 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 Technical Specification Required Shutdown Due to Loss of Both Channels of Refueling Water Storage Tank Instrumentation ENS 504672014-09-18T15:50:00018 September 2014 15:50:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Misaligned Control Rod ENS 478032012-04-04T09:00:0004 April 2012 09:00:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Inoperable Static Inverter ENS 473142011-10-03T07:45:0003 October 2011 07:45:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unit 2 Entered Tech Spec 3.0.3 After Declaring All Three Containment Recirc Fan Coolers Inoperable ENS 466372011-02-22T19:25:00022 February 2011 19:25:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown Due to Service Water Piping Leak ENS 409252004-08-05T03:24:0005 August 2004 03:24:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Low Refueling Water Storage Tank Level ENS 400692003-08-14T20:23:00014 August 2003 20:23:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unusual Event Declared Due to Loss of Offsite Power Greater than 15 Minutes. 2018-09-07T04:00:00 | |
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