ENS 42257

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v t e ENS Event
14:30 Jan 13, 2006
Title	Pressurizer Porv Stroke Times Exceed Analysis Assumptions
Event Description	The analyses for the Callaway Cold Overpressure Mitigating System (COMS) assumes an opening time and delay time for the pressurizer Power Operated Relief Valves (PORV)s. Evaluations performed by Callaway engineering personnel have determined that PORV stroke times measured during surveillance testing do not account for all of the delay times credited in the Design Bases COMS Analyses of Record. Further reviews determined the allowed delay times could not be met by the control loop. This results in potentially non-conservative PORV lifts settings relative to those specified in the PTLR for satisfying Technical Specification (TS) 3.4.1.2.a and 3.4.12.c. At the time the determination was made, the plant was in Mode 1. Technical Specification 3.4.12, COMS, is applicable in Mode 4 with RCS temperature less than or equal to 275 F, Mode 5 and Mode 6 with the head on the reactor vessel. The TS allows other methods of providing cold overpressure protection (ex. Residual Heat Removal system suction relief valves). Remedial actions have been initiated to ensure the COMS TS function is maintained when required, pending completion of corrective actions. The licensee notified the NRC Resident Inspector.

ENS 42257 +/-
Where
Callaway Missouri (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+2.38 h0.0992 days <br />0.0142 weeks <br />0.00326 months <br />)
Opened:	Gary Olmstead 16:53 Jan 13, 2006
NRC Officer:	John Knoke
Last Updated:	Jan 13, 2006
42257 - 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 42257\u003C/a\u003E - \u003Ca href=\"/Callaway\" title=\"Callaway\"\u003ECallaway\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EPressurizer Porv Stroke Times Exceed Analysis Assumptions\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 42257 - Callaway\n","link":"","lat":38.76076111111111,"lon":-91.78175833333333,"icon":"/w/images/0/06/Ameren_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Callaway with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2019-05-12T04:05:00 [Table view]
[ENS list for Callaway]

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