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| Entered date | Event description | |
|---|---|---|
| ENS 54929 | 3 October 2020 11:48:00 | At time 0815 (CDT) on 09/30/20, Main Steamline Radiation Monitor 2-RUK-2325/2327 (Main Steam Line 2-01/2-03 Radiation Monitor) was removed from service for planned maintenance. Compensatory measures were in place prior to removing the monitor from service to assure adequate monitoring capability available to implement the CPNPP (Comanche Peak Nuclear Power Plant) emergency plan in the unlikely event of challenges to the steam generator or fuel cladding. The N16 radiation monitor serves as a backup with alarm function and Radiation Protection technicians have been briefed on taking local readings with a Geiger-Mueller tube on MSL 2-01 and MSL 2-03. With this radiation monitor non-functional, compensatory measures in place and the monitor not restored to service within 72 hours, the condition is reportable as a loss of assessment capability per 10CFR50.72(b)(3)(xiii). Comanche Peak Nuclear Power Plant (CPNPP) has assurance of steam generator integrity and fuel cladding integrity and there is negligible safety significance to the current condition with respect to the public health and safety perspective. Corrective actions are being pursued to complete maintenance and restore 2-RUK-2325/2327 to functional status. The NRC Resident Inspector has been notified. |
| ENS 52937 | 30 August 2017 10:35:00 | At 0210 CDT on August 30, 2017, Comanche Peak Nuclear Power Plant (CPNPP) Unit 2 experienced an unplanned loss of the Plant Computer System (PCS). The loss of the Unit 2 PCS resulted in a loss of emergency assessment capability to the CPNPP Technical Support Center (TSC) and Emergency Operations Facility (EOF) for greater than 60 minutes. As of 0530 CDT the Unit 2 PCS has been restored. Assessment capability has been verified to be available in the TSC and EOF. This report is being made pursuant to 10CFR50.72(b)(3)(xiii), any event that results in a loss of emergency assessment capability, off site response capability, or off site communications ability. The NRC Resident Inspector has been informed. |