ENS 47656
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ENS Event | |
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22:55 Feb 9, 2012 | |
Title | Main Steam Line Pressure Transmitters Found Inoperable |
Event Description | A condition was discovered on February 9, 2012 that could have prevented fulfillment of the safety function to shutdown the reactor and maintain it in a safe shutdown condition and mitigate the consequences of an accident.
During maintenance performed on the main steam line pressure transmitters on both trains, the one-time use only EEQ seals were not replaced rendering the transmitters inoperable. These transmitters initiate safety injection and main steam isolation functions in the event of a main steam line break. Since all transmitters were inoperable this condition is being reported pursuant to 10 CFR 50.72(b)(3)(v)(A) and (D). The condition existed for about a week. Subsequently the required number of transmitters have been repaired and are operable. The NRC Senior Resident Inspector was notified and was present in the control room during the repair activity. The licensee also notified the State of Connecticut. |
Where | |
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Millstone ![]() Connecticut (NRC Region 1) | |
Reporting | |
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 | |
Time - Person (Reporting Time:+-0.57 h-0.0238 days <br />-0.00339 weeks <br />-7.80786e-4 months <br />) | |
Opened: | Barrett Nichols 22:21 Feb 9, 2012 |
NRC Officer: | Pete Snyder |
Last Updated: | Feb 9, 2012 |
47656 - NRC Website
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Unit 3 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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