The following 60-day report is being made under
10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation of the Unit 2, Division 1 and Division 2,
Emergency Diesel Generators (
EDG) that occurred on November 17, 2013, at 1000
CST. As allowed by
10 CFR 50.73(a)(1) this notification is being made via telephone.
(a) The specific train(s) and system(s) that were actuated.
On November 17th, during the required twenty-two year replacement of the ATWS [anticipated transient without scram] level transmitters, the Unit 2, Division 1 and Division 2, Emergency Diesel Generators (EDG) auto-started as a result of maintenance activities. The failure to remove trip relays, in addition to the sequence for the timing of the replacements, resulted in an unexpected and invalid low water level trip. Subsequently, this resulted in an automatic initiation of the Unit 2, Division 1 and 2, EDGs.
(b) Whether each train actuation was complete or partial.
Upon receiving the invalid low water level signal, both divisions of EDGs responded as expected for existing plant conditions. Therefore, the actuation was considered a complete actuation of both Division 1 and Division 2 EDGs.
(c) Whether or not the system started and functioned successfully.
Both Divisions of EDGs auto-started, achieved rated speed, and idled based upon offsite power being available to the safety related busses. Therefore, this is being considered a successful actuation of the Division 1 and Division 2 EDGs.
The NRC Resident Inspector has been notified.
