ENS 40217
From kanterella
Jump to navigation
Jump to search
ENS Event | |
---|---|
01:00 Oct 3, 2003 | |
Title | Loss of Safe Shutdown Capability Due to All Oprm Channels Being Declared Inoperable. |
Event Description | According to information provided by Nuclear Fuels, Reactor Engineering and G. E. Nuclear Energy, a condition exists in the Oscillation Power Range Monitors (OPRM's) that could contribute to exceeding a Safety Limit. This condition involves excessive confirmation count resets attributed to both the conditioning filter cutoff frequency and period tolerance values. G.E. Nuclear Energy can not confirm that performance of the OPRM's with the conditioning filter cutoff frequency and period tolerance settings currently in use would prevent a condition whereby a Safety Limit MCPR could be violated during an anticipated instability event. The OPRM conditioning filter cutoff frequency and period tolerance are currently set as allowed by licensing documentation, and are calculated as specified in NEDO-32465-A, Reactor Stability Detect and Suppress Solutions Licensing Basis Methodology for Reload Applications. As a result, all OPRM's at Nine-Mile Point Unit 2 are considered inoperable. This INOPERABILITY determination is based on information received from G.E. Nuclear Energy which evaluated the Nine Mile Point OPRM performance on July 24, 2003.
The licensee has taken action to address this condition in accordance with Technical Specification 3.3.1.1, Reactor Protection System Instrumentation. The licensee has a procedure providing guidance for alternate methods to detect and suppress thermal hydraulic instability. The licensee has notified the NRC Resident Inspector. |
Where | |
---|---|
Nine Mile Point ![]() New York (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor | |
Time - Person (Reporting Time:+1.08 h0.045 days <br />0.00643 weeks <br />0.00148 months <br />) | |
Opened: | Eli Dragomer 02:05 Oct 3, 2003 |
NRC Officer: | Gerry Waig |
Last Updated: | Oct 3, 2003 |
40217 - 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 40217\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\u003ELoss of Safe Shutdown Capability Due to All Oprm Channels Being Declared Inoperable.\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 40217 - 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 | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 568102023-10-23T00:48:00023 October 2023 00:48:00
[Table view]10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Average Power Range Monitors Declared Inoperable ENS 551372021-03-13T02:02:00013 March 2021 02:02:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Reactor Recirculation Pump Trip ENS 541992019-08-04T21:45:0004 August 2019 21:45:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Average Power Range Monitors Declared Inoperable 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 402172003-10-03T01:00:0003 October 2003 01:00:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor Loss of Safe Shutdown Capability Due to All Oprm Channels Being Declared Inoperable. 2023-10-23T00:48:00 | |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_40217&oldid=428935"