ENS 47967
From kanterella
Jump to navigation
Jump to search
ENS Event | |
|---|---|
17:22 May 25, 2012 | |
| Title | De-Energization of Both Divisions of Rhr Suction Line Primary Containment Isolations Valves During Testing |
| Event Description | On Friday, May 25th 2012 at 1322 EDT, Nine Mile Point Unit 2 experienced a loss of power to 600V 2EJS*US1 emergency load center while performing scheduled surveillance testing of the Division 1 Remote Shutdown System disconnect switches. Disconnect switch SW 1-2CESA20 was taken to the actuate position which isolated main control room control, bypassed the housing limit switches and aligned the trip test switch for local breaker control of 2EJS*US1 supply breaker 1-3B. Contacts in the trip test switch for 2EJS*US1 supply breaker 1-3B were found to be closed which energized its trip coil. This resulted in a loss of motive power to Division 1 Residual Heat Removal (RHR) system primary containment isolation valve 2RHS*MOV113 on the shutdown cooling suction line from the reactor vessel. At the time of the event, the Division 1 RHR shutdown cooling system was in-service with the Division 2 shutdown cooling suction line primary containment isolation valve 2RHS*MOV112 de-energized open to prevent inadvertent or spurious closure, which would interrupt the shutdown cooling decay heat removal function.
The result of the event was that both the Division 1 and Division 2 isolation valves on the common RHR shutdown cooling suction line (2RHS*MOV112 and 2RHS*MOV113) were open with no motive power. Thus, neither valve was capable of automatically closing in the event of a reactor level low (level 3) signal due to a leak in the RHR shutdown cooling system. The loss of this isolation function is being reported in accordance with 10 CFR 50.72(b)(3)(v) as an event or condition that could have prevented fulfillment of a safety function of a system that is needed to (D) mitigate the consequences of an accident. Technical Specification 3.6.1.3 Condition G was entered and actions to restore the valves to operable status were immediately initiated in accordance with Required Action G.2. Power to 2RHS*MOV113 was restored at 1824 hrs, re-enabling its automatic isolation capability. The licenses has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Nine Mile Point  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+3.92 h0.163 days <br />0.0233 weeks <br />0.00537 months <br />) | |
| Opened: | Andrew Michaud 21:17 May 25, 2012 |
| NRC Officer: | Bill Huffman |
| Last Updated: | May 25, 2012 |
| 47967 - NRC Website
Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 47967\u003C/a\u003E - \u003Ca href=\"/Nine_Mile_Point\" title=\"Nine Mile Point\"\u003ENine Mile Point\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EDe-Energization of Both Divisions of Rhr Suction Line Primary Containment Isolations Valves During Testing\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 47967 - Nine Mile Point\n","link":"","lat":43.52021388888889,"lon":-76.40656388888888,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null} | |
Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
Nine Mile Point with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
WEEKMONTHYEARENS 546922020-05-03T21:50:0003 May 2020 21:50:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Main Control Room Air Treatment System Inoperable ENS 543642019-11-01T07:16:0001 November 2019 07:16:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray (Hpcs) System Inoperable ENS 502962014-07-22T17:43:00022 July 2014 17:43:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Diesel Generator for High Pressure Core Spray Declared Inoperable During Surveillance Testing ENS 498592014-02-27T08:30:00027 February 2014 08:30:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray (Hpcs) System Declared Inoperable ENS 490292013-05-14T16:15:00014 May 2013 16:15:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Steam Flow Isolation Capability Identified as Non-Functional ENS 487942013-02-28T18:19:00028 February 2013 18:19:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray Pump Failure ENS 486962013-01-23T20:16:00023 January 2013 20:16:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Concurrent Loss of High Pressure Reactor Makeup Systems Capability ENS 479672012-05-25T17:22:00025 May 2012 17:22:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident De-Energization of Both Divisions of Rhr Suction Line Primary Containment Isolations Valves During Testing ENS 452842009-08-23T21:50:00023 August 2009 21:50:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Unplanned Inoperability of the High Pressure Core Spray System ENS 442062008-05-13T12:25:00013 May 2008 12:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to Loss of Offsite Power ENS 409202004-08-03T14:46:0003 August 2004 14:46:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident High Pressure Core Spray Rendered Inoperable Due to Faulty Test Equipment ENS 405062004-02-05T18:40:0005 February 2004 18:40:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Emergency Diesel Generator Ventilation Exhaust Damper Covered with Snow and Ice 2020-05-03T21:50:00 | |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_47967&oldid=423872"