ENS 40496

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v t e ENS Event
03:04 Dec 22, 2003
Title	Invalid Reactor Building Exhaust Radiation Monitor Signal Resulting in Pcis Isolations
Event Description	{{#Wiki_filter:This report is being made in accordance with �50.73 (a)(1), which states, in part, 'In the case of an invalid actuation reported under �50.73 (a)(2)(iv), other than actuation of the reactor protection system (RPS) when the reactor is critical, the licensee may, at its option, provide a telephone notification to the NRC Operations Center within 60 days after discovery of the event Instead of submitting a written LER.' These invalid actuations are being reported under �50.73 (a)(2)(iv)(A). NUREG-1022, Rev. 2, states that the report should provide the following information: - The specific train(s) and system(s) that were actuated - Whether each train actuation was complete or partial - Whether or not the system started and functioned successfully. On December 21, 2003, at 2204 hours, the Reactor Building Exhaust Radiation Monitor (i.e., 1-D12-RM-K609B) signal input spiked resulting in the invalid actuation of the logic associated with the instrument channel. The actuations included the Primary Containment Isolation System (PCIS) Group 6 (i.e., Containment Atmosphere Control/Dilution, Containment Atmosphere Monitoring, and Post Accident Sampling Systems) valves, the Reactor Building Ventilation System isolation (i.e., Secondary Containment isolation) and the automatic start of both Standby Gas Treatment (SGT) System trains A and B. The actuations of PCIS Group 6 valves and Reactor Building Ventilation System isolation were complete and the affected equipment responded as designed to the invalid signal (i.e., the valves and dampers that were open, at the time of the event, closed). Additionally, SGT System trains A and B started and functioned successfully. After verification of the expected equipment responses, 1-D12-RM-K609B was reset, the actuation logic was reset, and the equipment/systems were returned to the status required by plant conditions. A radiological survey of the monitored area was completed with no abnormal conditions noted. Discussion of the causes and corrective actions associated with this event are documented in the corrective action program in action request (i.e., AR) 114005. The resident inspector has been notified. }}

ENS 40496 +/-
Where
Brunswick North Carolina (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1015.85 h42.327 days <br />6.047 weeks <br />1.392 months <br />)
Opened:	Charles Elberfeld 10:55 Feb 2, 2004
NRC Officer:	Steve Sandin
Last Updated:	Feb 2, 2004
40496 - NRC Website
v • d • e

v t e Emergency Notification System
Brunswick with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2024-01-02T04:33:00 [Table view]
[ENS list for Brunswick]

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