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| Entered date | Event description | |
|---|---|---|
| ENS 51149 | 11 June 2015 22:28:00 | During containment spray pump inservice testing the minimum flow recirculation line recorded negative flow indicating reverse flow in the line. After the troubleshooting, it was determined that a degraded minimum flow check valve was allowing a path to the refueling water storage tank (RWST) for certain post loss of coolant accident (LOCA) conditions. The minimum flow isolation has been closed to eliminate the path. No actuation occurred during this time. The NRC Resident Inspector, Connecticut Department of Energy and Environmental Protection (DEEP) Hartford, and Watertown Dispatch have been notified.
The purpose of this call is to correct the record for the 10 CFR 50.72(b)(3)(v)(C) event report provided on June 11, 2015. Event report number 51149 states: 'During containment spray pump inservice testing ...' The condition of the degraded containment spray flow check valve was identified: 'During high pressure safety injection pump inservice testing...'." Notified R1DO (Bickett)
The purpose of this call is to update the record for the 10 CFR 50.72(b)(3)(v)(C) event report provided on June 11, 2015. During subsequent investigation, it has been determined that a second release path may have existed through ECCS system relief valves under certain post LOCA conditions as a result of the degraded check valve described in the original report. The licensee has informed the NRC Resident Inspector. Notified R1DO (Cahill). |
| ENS 50209 | 18 June 2014 12:35:00 | At 0832 EDT on 6/18/2014, Millstone Station Unit 2 removed the Main Steam Line Radiation Monitors RM-4299B and RM-4299C from service for pre-planned maintenance. Portable handheld radiation detectors will be used to assess radiation releases. Both radiation monitors will be restored no later than 2200 EDT on 6/19/14. The licensee informed both State and local agencies and the NRC Resident Inspector. |
| ENS 50206 | 17 June 2014 13:50:00 | At 0749 EDT, Millstone Station Unit 2 removed the Stack Radiation Monitor RM-8169 from service for planned maintenance. Maintenance and testing were completed and the Stack Radiation Monitor was returned to service at 0945 EDT. The licensee informed both State and local agencies and the NRC Resident Inspector. |
| ENS 49642 | 17 December 2013 13:38:00 | At 1015 EST on 12/17/13, the Unit 2 high range stack radiation monitor RM-8168 was removed from service for preplanned maintenance. The maintenance was completed and the radiation monitor returned to service at 1300 EST. The licensee notified the NRC Resident Inspector and the State and Local Governments. |
| ENS 49420 | 8 October 2013 16:31:00 | The Millstone Power Station Unit 2 Stack Radiation Monitor, RM-8169 is being removed from service for preplanned maintenance. The radiation monitor is estimated to be out of service for approximately 6 hours. This action is reportable as a loss of assessment capability in accordance with 10 CFR 50.72(b)(3)(xiii). The NRC Resident Inspector has been notified. State and local authorities were notified by the licensee. |
| ENS 49100 | 7 June 2013 15:11:00 | On June 7, 2013 at 1351 EDT, Millstone Unit 2 rendered the Main Steam Line Radiation Monitors (RM-4299 A/B/C) out-of-service for planned maintenance. The maintenance activity was completed and the radiation monitors were returned to service at 1355 EDT. The licensee has notified the NRC Resident Inspector as well as the State and local agencies. |