ENS 42257
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ENS Event | |
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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. |
Where | |
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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
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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