ENS 51579
From kanterella
Jump to navigation
Jump to search
ENS Event | |
|---|---|
01:36 Dec 2, 2015 | |
| Title | Secondary Containment Inoperable Due to Secondary Containment Vacuum Being Less than Required Ts Value |
| Event Description | On December 1, 2015 at 2036 EST, with James A. FitzPatrick Nuclear Power Plant (JAF) operating at 100 percent power, Secondary Containment differential pressure exceeded the Technical Specification (TS) Surveillance Requirement (SR) of greater than or equal to 0.25 inches of vacuum water gauge for approximately one (1) minute and twenty (20) seconds. Secondary Containment (SC) had been declared inoperable prior to this event, to facilitate a planned evolution related to a previous failure that occurred on September 18, 2015 [reference EN #51409].
Operators attempted to restore the Reactor Building Ventilation System (RBVS) to the normal system lineup upon completion of the planned evolution. The Secondary Containment differential pressure trended positive, and exceeded the TS SR differential pressure requirement during this transition. Preliminary investigations indicate that the cause of this event is associated with the Above Refuel Floor Exhaust Fan (66FN-13B). The design of the Above Refuel Floor Exhaust portion of the RBVS includes an interlock between the exhaust fan and a downstream damper position switch, which starts the fan when the damper is in the full open position. During the approximate one (1) minute and twenty (20) second duration that the TS SR was not met, 66FN-13B was not running with the associated discharge damper in the open position. Secondary Containment was operable after the SC differential pressure was restored upon start of 66FN-13B, and remains operable. This event is reportable pursuant to 10 CFR 50.72(b)(3)(v)(c), as an event or condition that could have prevented fulfillment of a safety function. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Fitzpatrick  New York (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| LER: | 05000333/LER-2015-007 |
| Time - Person (Reporting Time:+12.63 h0.526 days <br />0.0752 weeks <br />0.0173 months <br />) | |
| Opened: | Dustin Scurlock 14:14 Dec 2, 2015 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Dec 2, 2015 |
| 51579 - 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 51579\u003C/a\u003E - \u003Ca href=\"/FitzPatrick\" title=\"FitzPatrick\"\u003EFitzPatrick\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ESecondary Containment Inoperable Due to Secondary Containment Vacuum Being Less than Required Ts Value\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 51579 - FitzPatrick\n","link":"","lat":43.52241111111111,"lon":-76.39899444444444,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
FitzPatrick with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
WEEKMONTHYEARENS 538282019-01-16T05:00:00016 January 2019 05:00:00
[Table view]10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Differential Pressure Exceeded Technical Specification Allowed Value ENS 537782018-12-05T05:00:0005 December 2018 05:00:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Three Minute Loss of Secondary Containment Vacuum ENS 523432016-11-02T12:45:0002 November 2016 12:45:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Residual Heat Removal Valve Inoperable for Containment Isolation ENS 519852016-06-07T14:30:0007 June 2016 14:30:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Both Secondary Containment Doors Open Simultaneously ENS 515792015-12-02T01:36:0002 December 2015 01:36:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Inoperable Due to Secondary Containment Vacuum Being Less than Required Ts Value ENS 515122015-09-22T20:09:00022 September 2015 20:09:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Secondary Containment Differential Pressure Exceeded Technical Specification Allowed Value ENS 514092015-09-18T18:08:00018 September 2015 18:08:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Equipment Failure Results in Inoperable Secondary Containment ENS 514052015-09-17T16:20:00017 September 2015 16:20:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Brief Loss of Secondary Containment Due to Both Airlock Doors Open Simultaneously ENS 512422015-07-20T11:40:00020 July 2015 11:40:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Temporary Loss of Differential Pressure in Secondary Containment ENS 505792014-10-28T21:08:00028 October 2014 21:08:00 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material Reactor Building Vacuum Below Technical Specification Limit 2019-01-16T05:00:00 | |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_51579&oldid=421278"