ENS 47249

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v t e ENS Event
19:20 May 5, 2011
Title	Invalid Specified System Actuation
Event Description	This report is a 60-day telephone notification in lieu of a written licensee event report being made under 10CFR50.73(a)(2)(iv)(A) and 10CFR50.73(a)(1). The event was an invalid actuation of a Unit 2 Containment Ventilation Isolation (CVI). At the time of the event Unit 1 was at 100% power and Unit 2 was at 85% power. At 1520 EDT on 5/5/2011, an 'A' train CVI signal was inadvertently initiated during a surveillance test for containment purge air exhaust radiation monitor 2-RM-90-130. The inadvertent CVI signal was initiated due to incorrect connection of test equipment. The signal caused the 'A' train containment upper and lower compartment radiation monitor isolation valves to close. Unit 2 entered Technical Specification Limiting Condition for Operation (LCO) 3.3.3.1 Action 27 and LCO 3.4.6.1 Action b, due to the isolation of lower compartment radiation monitor 2-RM-90-106. The inadvertent CVI signal was also received by the containment vent system, but the containment vent system was not in service and no valves were actuated. The radiation monitoring (system 90) and the containment vent (system 30) systems received a complete 'A' train CVI signal. The 'A' train radiation monitoring isolation valves closed as designed. The containment vent system was not in service, and since the valves were already closed, no valves were actuated. Actual plant conditions did not exist that required a CVI signal. Therefore, this actuation was invalid. The delay in reporting this event was due to an initial interpretation that the event did not result in an actuation of the systems listed in paragraph 10CFR50.73(a)(2)(iv)(B), because only one system was in service which was affected by the actuation. Subsequent discussions noted that while only one system was in service, both systems received the CVI signal. The event is reported as a 60-day telephone notification in lieu of a written licensee event report being made under 10CFR50.73(a)(2)(iv)(A) and 10CFR50.73(a)(1). The date, when the final determination of the invalid system actuation was made, was not provided. The licensee notified the NRC Resident Inspector.

ENS 47249 +/-
Where
Sequoyah Tennessee (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+3015.23 h125.635 days <br />17.948 weeks <br />4.13 months <br />)
Opened:	Matt Lovitt 10:34 Sep 8, 2011
NRC Officer:	John Shoemaker
Last Updated:	Sep 8, 2011
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v • d • e

v t e Emergency Notification System
Sequoyah with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2021-01-11T16:52:00 [Table view]
[ENS list for Sequoyah]

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