ENS 52631: Difference between revisions

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{{ENS notification
{{ENS notification
| event number = 52631
| event number = 52631
| facility = River Bend
| facility = River Bend<Br> Region: 4&Nbsp;State: La<Br> Unit: [1] [&Nbsp;] [&Nbsp;]<Br> Rx Type: [1] Ge-6<Br> Nrc Notified By: Tim Gates<Br> Hq Ops Officer: Karl Diederich </Td> <Td > Notification Date: 03/23/2017<Br> Notification Time: 07:24 [Et]<Br> Event Date: 03/23/2017<Br> Event Time: 02:56 [Cdt]<Br> Last Update Date: 03/23/2017 </Td> </Tr> <Tr > <Td  > Emergency Class: Non Emergency<Br> 10 Cfr Section: <Br> 50.72(B)(3)(V)(D) - Accident Mitigation<Br> </Td> <Td > Person (Organization): <Br> James Drake (R4Do)<Br> </Td> </Tr>
| Organization =  
| Organization =  
| license number =  
| license number =  
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| utype = GE-6
| utype = GE-6
| cfr = 10 CFR 50.72(b)(3)(v)(D)
| cfr = 10 CFR 50.72(b)(3)(v)(D)
| emergency class = Non Emergency
| emergency class = Non Emergency
| notification date = 03/23/2017 07:24
| notification date = 03/23/2017 07:24
| notification by = Tim Gates
| notification by = Tim Gates
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| event date = 03/23/2017 02:56 CDT
| event date = 03/23/2017 02:56 CDT
| last update date = 03/23/2017
| last update date = 03/23/2017
| title = High Pressure Core Spray Declared Inoperable
| title =  
| event text = River Bend Station personnel declared the High Pressure Core Spray (HPCS) system inoperable at 0256 on 3/23/2017.
| event text =  
During performance of the HPCS Pump and Valve Operability Test, the operators observed an unusual system response after E22-MOVF023 (HPCS Test Return to the Suppression Pool) was stroked closed.  A field check showed that the key that connects the E22-MOVF023 valve stem to the anti-rotation device had become dislodged.
E22-MOVF023 is a Primary Containment Isolation Valve (PCIV) and is designed to close automatically on an ECCS [Emergency Core Cooling System] initiation signal to ensure that injection flow is directed to the reactor vessel.  Technical Specification (TS) 3.6.1.3 requires that containment penetrations associated with an inoperable PCIV be isolated.  E22-MOVF023 was declared inoperable at 0028.  Operators were unable to close or demonstrate that E22-MOVF023 was fully closed as required by TS 3.6.1.3 and proceeded to isolate the associated containment penetration by closing other system valves.  This action was completed at 0320.
The net effect of the actions taken to isolate the containment penetration is that HPCS is inoperable as of 0256.  This results in 14 day LCO.
The licensee has notified the NRC Resident Inspector.
* * * UPDATE FROM DAN JAMES TO KARL DIEDERICH ON 3/23/17 AT 10:01 EDT * * *
The Event Time was 0028 CDT rather than 0256 CDT.  "The scheduled surveillance test of the high pressure core spray system was initiated at 2355 CDT on March 22, and the pump was secured at 0028 CDT on March 23.  The inspection of the HPCS test return valve to the suppression pool occurred at 0050 CDT, and it was at that point that an apparent malfunction of the valve had occurred to the extent that it did not appear to be able to perform its safety function to close upon receipt of a design basis system initiation signal.  Thus, the event time for this condition would be more accurately defined as 0028 CDT.
Notified R4DO (James Drake) via e-mail.
| URL = http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20170324en.html#en52631
| URL = http://www.nrc.gov/reading-rm/doc-collections/event-status/event/2017/20170324en.html#en52631
}}{{unit info
| Unit = 1
| type = GE-6
| Scram code = N
| Reactor critical = Y
| Initial power = 100
| Initial reactor mode = Power Operation
| Current power = 100
| Current reactor mode = Power Operation
}}
}}


{{ENS-Nav}}[[Category:Power Reactor]]
{{ENS-Nav}}[[Category:Power Reactor]]

Revision as of 20:32, 15 November 2024

]]
Louisiana (NRC Region 4)
ENS 52631 +/-
Where
[[site::River Bend
Region: 4&Nbsp;State: La
Unit: [1] [&Nbsp;] [&Nbsp;]
Rx Type: [1] Ge-6
Nrc Notified By: Tim Gates
Hq Ops Officer: Karl Diederich 		Notification Date: 03/23/2017
Notification Time: 07:24 [Et]
Event Date: 03/23/2017
Event Time: 02:56 [Cdt]
Last Update Date: 03/23/2017
Emergency Class: Non Emergency
10 Cfr Section:
50.72(B)(3)(V)(D) - Accident Mitigation
 Person (Organization):
James Drake (R4Do)
Reporting
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-0.53 h-0.0221 days <br />-0.00315 weeks <br />-7.25994e-4 months <br />)
Opened: Tim Gates
07:24 Mar 23, 2017
NRC Officer: Karl Diederich
Last Updated: Mar 23, 2017
52631 - NRC Website
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