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| Entered date | Event description | |
|---|---|---|
| ENS 56094 | 7 September 2022 15:06:00 | The following information was provided by the licensee via fax: Auxiliary Feedwater Pump #12 actuation and isolation of the Steam Generator Blowdown for 'A', 'B' and 'C' Steam Generators. Per 10 CFR 50.73(a)(1), the telephone notification is made under 10 CFR 50.73(a)(2)(iv)(A) for an invalid actuation. On 7/28/2022 at 1705 CDT, the Unit 1 Control Room received alarm SPQD0183 'SG LO-LO LVL TRN B ACT' and actuation of the Auxiliary Feedwater Pump #12 and isolation of the Steam Generator Blowdown for 'A', 'B' and 'D' Steam Generators. This event was classified as an unplanned entry into Technical Specification Shutdown LCO equal to or less than 24 hours 'Simple Restoration', due to the availability of CRMP. This alarm occurred several times and with each occurrence the alarm was short lived (1 second or less). Operations placed Auxiliary Feedwater Pump #12 in the Pull-To-Lock position to prevent starting of the pump with each alarm occurrence. During troubleshooting it was determined that SSPS Logic 'R' train was generating the intermittent alarm condition. A Logic board and a Safeguard Driver board were replaced which was identified as the possible cause. Operations performed applicable sections of the Logic test to ensure SSPS 'R' train operable. The event had no effects/consequences on the unit. The Logic board and Safeguard Driver board in SSPS 'R' train were both replaced as the possible causes, and therefore both boards were sent to Westinghouse to determine which board was at fault. The NRC Resident Inspector has been notified. |
| ENS 52775 | 30 May 2017 14:10:00 | On May 30, 2017 at 0929 (CDT), South Texas Project (STP) removed from service Integrated Computer System (ICS) connections to the Emergency Operations Facility (EOF) for planned maintenance. The ICS computers are used in the EOF to directly monitor selected plant parameters and to provide Emergency Response assessment capabilities. This planned maintenance implements a software modification and is expected to last for four days. This is reportable under 10 CFR 50.72(b)(3)(xiii) because the EOF assessment capabilities would not be able to be restored within the facility activation time and assessment capabilities cannot be performed at a backup facility (i.e., there is no backup EOF). While ICS connections in the EOF are out of service, if the Emergency Plan is entered and the Technical Support Center (TSC) and EOF are staffed, the EOF will not activate and Emergency Director authority will remain in the TSC. The Emergency Response Organization team members that report to the EOF and TSC have been notified regarding the status of the ICS computers in the EOF. The planned modification that impacts the ICS computers in the EOF does not affect the health and safety of the public or station employees. The NRC Resident Inspector has been notified. The licensee notified the Matagorda County Sheriff, and the State of Texas Department of Public Safety and the Department of State Health Services. |
| ENS 51964 | 27 May 2016 23:17:00 | A South Texas Project offsite emergency notification siren was inadvertently going off. The Matagorda County Sheriff's Office notified Site Security that a siren had actuated. At the time of the inadvertent siren actuation the area was experiencing lightning and rain. Suspect lightning caused the inadvertent siren actuation. Station Personnel are addressing the issue with the siren. The Matagorda County Sheriff's Office was the only offsite agency that was contacted during the event. The licensee has notified the NRC Resident Inspector. |
| ENS 51787 | 14 March 2016 04:52:00 | A South Texas Project, Offsite Emergency Notification Siren, was inadvertently going off. The Matagorda County Sheriff's Office notified Site Security that a siren had actuated for no apparent reason. Station personnel are addressing the issue with the siren. The Matagorda County Sheriff's Office was the only offsite agency that was contacted during the event. The siren was tested and is considered functional at this time. Additional testing will be completed during daylight hours. The licensee will notify the NRC Resident Inspector. |