ENS 49103
ENS Event | |
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06:28 Apr 11, 2013 | |
Title | 60-Day Optional Telephone Notification for an Invalid Specified System Actuation |
Event Description | This 60-day telephone notification is being made per the reporting requirements specified in 10CFR50.73(a)(2)(iv)(A) and 10CFR50.73(a)(1) to describe an invalid actuation signal affecting the emergency feedwater system.
While the plant was in Mode 5 on 4/11/2013, during performance of a maintenance procedure for AMSAC system logic verification, an invalid MDAFAS occurred. (Note: AMSAC is ATWAS Mitigation System Actuation Circuitry and MDAFAS is Motor Driven Auxiliary Feedwater Actuation Signal). Both trains of the Motor Driven Auxiliary Feedwater Pumps (MDAFPs) started. While generation of the actuation signal is an expected result of the procedure, the actuation occurred several steps earlier in the procedure than expected. Additionally, the Control Room Operators were not expecting the MDAFPs to start. The pumps were manually stopped. The actuation was caused by procedural guidance not containing a sufficiently prescribed sequence of activities that should occur when simulating plant conditions leading to the intended actuation of the AMSAC system. The plant was not in a condition where feedwater was required. The Senior NRC Resident Inspector was notified. |
Where | |
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Callaway Missouri (NRC Region 4) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+1450.63 h60.443 days <br />8.635 weeks <br />1.987 months <br />) | |
Opened: | Steve Petzel 17:06 Jun 10, 2013 |
NRC Officer: | Donald Norwood |
Last Updated: | Jun 10, 2013 |
49103 - NRC Website
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Unit 1 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Cold Shutdown (0 %) |
After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 570912024-03-25T01:56:00025 March 2024 01:56:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Automatic Turbine Driven Auxiliary Feedwater Pump ENS 559722022-05-02T04:05:0002 May 2022 04:05:00 Other Unspec Reqmnt, 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 491412013-04-24T09:04:00024 April 2013 09:04:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephone Notification for an Invalid Specified System Actuation ENS 491032013-04-11T06:28:00011 April 2013 06:28:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephone Notification for an Invalid Specified System Actuation 2024-03-25T01:56:00 | |