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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 51264 | 27 July 2015 00:25:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unit 2 Site Stack Radiation Monitor Failure | The Millstone Site Rad Monitor, RM-8169, has failed and was declared NOT FUNCTIONAL at 2025 (EDT) on July 26, 2015. This is reportable pursuant to 10CFR50.72(b)(3)(xiii), as any event that results in a major loss of emergency assessment capability, off-site response capability, or off-site communication capability. I&C (Instrumentation and Control) is developing a troubleshooting and repair plan. The licensee notified the NRC Resident Inspector, the State of Connecticut Department of Energy and Environmental Protection, and the City of Waterford Dispatch. The loss of this radiation monitor is considered a major loss of assessment capability since it is used in Emergency Action Level (EAL) classification and there is no compensatory measure available. | ||
| ENS 51161 | 17 June 2015 03:43:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Service Water Effluent Radiation Monitor Out of Service | The B train of the service water effluent radiation monitor failed at 2343 EDT and is being repaired. The licensee notified the NRC Resident Inspector.
The purpose of this call is to retract a report made on June 17, 2015, NRC Event Number 51161. Event Report number 51161 describes a condition at Millstone Power Station Unit 3 (MPS3) in which a service water radiation monitor failed, was taken out of service for repair and was reported in accordance with 10 CFR 50.72(b)(3)(xiii) as a loss of emergency assessment capability. Upon further review, MPS3 has concluded that the subject radiation monitor is not utilized for emergency assessment capability. Therefore, this condition is not reportable and NRC Event Number 51161 is being retracted. The basis for this conclusion will be provided to the NRC Resident Inspector. R1DO(Dimitriadis) have been notified. | Service water | |
| ENS 51035 | 3 May 2015 01:30:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Normal and Hi Range Ventilation Process Radiation Monitors Out of Service | Loss of assessment capability due to unplanned removal from service of a radiation monitor due to process flow monitor indication failing hi. The normal and hi range ventilation vent process radiation monitors (3HVR*RE10A/B are out of service. This condition was discovered during control room rounds. The condition is reportable per 10CFR50.72(b)(3)(xiii). Compensatory measures are in place. The licensee notified the NRC Resident Inspector and applicable State and Local authorities. | ||
| ENS 50873 | 9 March 2015 13:57:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Millstone Unit 2 Site Stack Radiation Monitor Sample Pump Trip | On March 9, 2015 at 0957 EDT, the Millstone Site Stack Radiation Monitor RM 8169 sample pump tripped. This resulted in a loss of assessment capability. Compensatory measures have been put in place to provide chemistry sampling. The cause is under investigation and the Instrument & Controls Department is troubleshooting and repairing the sample pump. The NRC Resident Inspector, Connecticut Department of Environmental Protection, and the Town of Waterford have been notified. | ||
| ENS 50842 | 22 February 2015 02:22:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Reactor Vessel Level Monitoring System Inoperable | The licensee declared the reactor vessel level monitoring system (RVLMS) inoperable when an intermittent failure occurred in the 'B' train reactor vessel level monitoring system (RVLMS) concurrent with the loss of the 19% level sensor in the 'A' train. This caused entry into a 7-day LCO action statement under Technical Specification 3.3.6, Action E. The 'B' train instrumentation was reset and indication returned to normal and the LCO action was exited after 36 minutes. A Condition Report was submitted to determine cause and repair, if needed. The licensee has notified the NRC Resident Inspector as well as state and local authorities. | ||
| ENS 50841 | 22 February 2015 00:50:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Site Stack Radiation Monitor Failure | The Millstone site stack radiation monitor, RM-8169, failed and was declared inoperable at 1950 EST on February 21, 2015. Repairs are in progress. This event is reportable pursuant to 10 CFR 50.72(b)(3)(xiii) as any event that results in a major loss of emergency assessment capability, off-site response capability, or off-site communications capability. The Instrument and Controls Department is conducting troubleshooting and repair. The cause of the radiation monitor failure was sample pump failure. The licensee has notified the NRC Resident Inspector and applicable State and Local authorities. | ||
| ENS 50797 | 9 February 2015 13:24:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack High Range Radiation Monitor Out of Service for Planned Maintenance | The Unit 2 Stack High Range Radiation Monitor (RM-8168) was removed for service for planned maintenance. There is no significant effect of this planned maintenance on the plant. The licensee notified the NRC Resident Inspector, the State of Connecticut and Waterford township. | ||
| ENS 50775 | 28 January 2015 13:49:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Site Stack Radiation Monitor Failure | The Millstone site stack radiation monitor, RM-8169, failed and was declared inoperable at 0849 EST on January 28, 2015. Repairs are in progress. This event is reportable pursuant to 10 CFR 50.72(b)(3)(xiii) as any event that results in a major loss of emergency assessment capability, off-site response capability, or off-site communications capability. The Instrument and Controls Department is conducting troubleshooting and repair. The cause of the radiation monitor failure was pump failure. Estimated return to service is 1600 EST on 1/29/15. The licensee has notified the NRC Resident Inspector and applicable State and Local authorities. | ||
| ENS 50767 | 26 January 2015 21:50:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Turbine Building Stack Ventilation Radiation Process Monitors Removed from Service | Normal and High Range Ventilation Process Radiation Monitors (3HVR*RE10A/B) were removed from service due to low process flow affecting sample flow. The cause of the low process flow is unknown and under investigation at this time. Maintenance was performed yesterday, 1/26/15, including a successful calibration. Action taken includes placing temporary sampling in service and estimating process flow. A priority one work package has been issued with repairs in progress. The licensee informed the State of Connecticut, Waterford Township Police and the NRC Resident Inspector. | ||
| ENS 50568 | 25 October 2014 15:30:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Ventilation Process Radiation Monitors Out of Service for Planned Maintenance | The normal and high range ventilation process radiation monitors (3HVR*RE 10 A/B) were removed from service for preplanned maintenance for greater than 72 hours. The radiation monitors will be returned to service following maintenance and completion of operational testing. The licensee has notified the NRC Resident Inspector, the State of Connecticut and Waterford township.. | ||
| ENS 50567 | 24 October 2014 23:03:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Normal Range Radiation Monitor Out of Service for Unplanned Maintenance | The normal range Supplemental Leakage Collection and Release System (SLCRS) was removed from service due to a sample pump failure. Compensatory sampling and monitoring is being established per the Radiological Effluent Monitoring and Offsite Dose Calculation Manual. Following the sample pump repairs and restoration, the Radiation Monitor will be returned to service. The licensee notified the NRC Resident Inspector, the State of Connecticut and Waterford township. | ||
| ENS 50483 | 23 September 2014 12:19:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Radiation Monitor Out of Service for Planned Maintenance | (Millstone) U2 High Range Stack Radiation Monitor, RM-8168 was removed from service for pre-planned maintenance. This action is reportable as a loss of assessment capability per 10CFR50.72(b)(3)(xiii). RM-8168 was restored to operable status on 9/23/14 at 1212 (EDT). The licensee has notified the NRC Resident Inspector and state and local authorities. | ||
| ENS 50444 | 10 September 2014 15:06:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Radiation Monitor Out of Service | Loss of assessment capability due to pre-planned maintenance affecting a radiation monitor for supplementary leakage collection and release system. (Monitor) (3HVR*RE19A/B) will be out of service. The condition is reportable per 10CFR50.72(b)(3)(xiii). The equipment is expected to be restored within 48 hours. The licensee notified the NRC Resident Inspector. | ||
| ENS 50432 | 8 September 2014 13:17:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack Radiation Monitor Out of Service for Planned Maintenance | Millstone site Stack Radiation Monitor, RM-8169, was removed from service for scheduled maintenance. This is reportable as a loss of assessment capability in accordance with 10 CFR 50.72(b)(3)(xiii). Expected return to service time is at 1600 (EDT) on 9/8/14. The licensee has notified Waterford township, the State of Connecticut and the NRC Resident Inspector. | ||
| ENS 50406 | 27 August 2014 12:39:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Process Radiation Monitors Removed from Service for Planned Maintenance | Loss of assessment capability due to preplanned maintenance affecting radiation monitors. Normal ventilation and 'HI' range process radiation monitors (3HVR & RE10A/10B) will be out of service. This condition is reportable per 10 CFR 50.72(b)(3)(xiii). The equipment is expected to be restored within 9 hours. The NRC Resident Inspector has been notified. The licensee will notify the state and local governments. | ||
| ENS 50400 | 26 August 2014 11:59:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unit 2 High Range Stack Radiation Monitor Taken Out of Service for Pre-Planned Maintenance | Millstone removed their unit 2 high range site radiation monitor, RM-8168, from service for pre-planned maintenance. RM-8168 was restored to service at 1012 EDT on 8/26/14. The licensee notified the NRC Resident Inspector, the State of Connecticut, and the town of Waterford. | ||
| ENS 50357 | 12 August 2014 17:19:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Site Stack Radiation Monitor Out of Service for Planned Maintenance | Millstone removed their site stack radiation monitor, RM-8169, from service for scheduled maintenance. Expected duration of maintenance is 8 hours. The licensee notified the NRC Resident Inspector, the State of Connecticut, and the town of Waterford. | ||
| ENS 50343 | 5 August 2014 11:47:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Removal of Stack High Radiation Monitor for Maintenance | Unit 2 high range stack radiation monitor, RM-8168, was removed from service for planned maintenance. This action is reportable as a loss of assessment capability per 10CFR50.72(b)(3)(xiii). RM-8168 will be restored to operable status by 1800 EDT. The licensee notified the NRC Resident Inspector, State of Connecticut, and local agencies. | ||
| ENS 50329 | 31 July 2014 12:25:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | High Range Stack Monitor Taken Out of Service for Planned Maintenance | At 0825 EDT, Millstone Station Unit 2 removed the Stack High Range Radiation Monitor RM-8168 from service for planned maintenance. Maintenance was completed and operability was restored at 0937 EDT. The licensee informed both State and local agencies and the NRC Resident Inspector. | ||
| ENS 50281 | 15 July 2014 13:40:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack High Range Radiation Monitor Out of Service for Planned Maintenance | The Unit 2 stack high range radiation monitor (RM 8169) was removed from service at 0940 EDT for planned maintenance. The monitor was returned to service at 1119 EDT after the completion of maintenance. The licensee notified the NRC Resident Inspector, the Connecticut Department of Energy and Environmental Protection, and the city of Waterford for this event. | ||
| ENS 50241 | 30 June 2014 17:10:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack High Range Radiation Monitor Out of Service for Planned Maintenance | The Unit 2 stack high range radiation monitor was removed from service at 1310 EDT for planned maintenance. The monitor was returned to service at 1420 EDT after the completion of maintenance. The licensee notified the NRC Resident Inspector, the Connecticut Department of Energy and Environmental Protection, and Waterford city of this event. | ||
| ENS 50211 | 19 June 2014 12:03:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Process Radiation Monitor Maintenance | System affected: Normal and High Range SLCRS (Supplementary Leakage Collection and Release System) ventilation process radiation monitors. Actuations and their initiation signals: None. Causes: Removed from service for scheduled maintenance. Effect of event on plant: None. Actions taken or planned: Complete required calibration. Additional information: Will be returned to service following maintenance. The licensee notified the NRC Resident Inspector and applicable State and local agencies. | ||
| ENS 50209 | 18 June 2014 12:32:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Maintenance Being Performed on Main Steam Line Radiation Monitors | 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. | Main Steam Line | |
| ENS 50206 | 17 June 2014 11:49:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack Radiation Monitor Taken Out of Service for Planned Maintenance | 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 50168 | 3 June 2014 16:59:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | High and Low Range Ventilation Process Radiation Monitor Pre-Planned Maintenance | At 1259 EDT, Millstone Station Unit 3 removed the High and Low Range Ventilation Process Radiation Monitors from service for planned maintenance. The radiation monitor is expected to be out of service for approximately less than 24 hours. Compensatory measures are in place. The licensee informed both State and local agencies and the NRC Resident Inspector. | ||
| ENS 50165 | 3 June 2014 13:33:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | High Range Stack Monitor Taken Out of Service for Planned Maintenance | At 0933 EDT, Millstone Station Unit 2 removed the Stack High Range Radiation Monitor RM-8168 from service for planned maintenance. Maintenance and testing were completed and the Stack Radiation Monitor returned to service at 1252 EDT. The licensee informed both State and local agencies and the NRC Resident Inspector. | ||
| ENS 50142 | 25 May 2014 11:02:00 | 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation 10 CFR 50.72(a)(1)(i), Emergency Class Declaration 10 CFR 50.72(b)(3)(iv)(A), System Actuation 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unusual Event Due to Loss of Offsite Power | At 0702 EDT on 5/25/14, Millstone Units 2 and 3 experienced a loss of offsite power and subsequent trip of both units. An Unusual Event was declared by Millstone Units 2 and 3 at 0715 EDT. Power is currently being supplied to all emergency busses by the emergency diesel generators. Offsite power is not available. At this time, it appears that the loss of offsite power is due to a localized issue in the Millstone switchyard. The surrounding areas were not affected. A decision was made to take the NRC to monitoring mode at 0749 EDT with Region 1 in the lead. Notified DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email.
All EDGs have been secured and offsite power has been restored. The licensee is reporting the loss of two stack radiation monitors - 8168 and 8169. This is reportable under 10CFR50.72(b)(3)(xiii). Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant).
At 1414 EDT the licensee terminated the Unusual Event. Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant), DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email. | Emergency Diesel Generator | 05000336/LER-2014-006 |
| ENS 50125 | 20 May 2014 12:53:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Assessment Capability Due to Pre-Planned Maintenance on Stack Radiation Monitor | At 0853 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 returned to service at 1100 EDT. The licensee informed both State and local agencies and the NRC Resident Inspector. | ||
| ENS 50106 | 12 May 2014 11:31:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unit 2 Stack High Range Radiation Monitor Removed from Service for Pre-Planned Maintenance | The Unit 2 Stack High Radiation Monitor, RM-8168, was removed from service for pre-planned maintenance. There are no actuations associated with this Radiation Monitor. Testing was completed and the radiation monitor was restored to operable at 1013 EDT, on 5/12/14. The licensee has informed the NRC Resident Inspector and applicable State and Local authorities. | ||
| ENS 50060 | 26 April 2014 02:28:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack Radiation Monitor Removed from Service for Planned Maintenance | System Affected: Millstone Station Stack Radiation Monitor, RM-8169 Actuations and Their Signals: None Causes: Preplanned Maintenance Effect of Event on Plant: None Actions Taken or Planned: Completed testing and restored operability" (on 4/26/14 at 0037 EDT) Additional Information: None The licensee notified the NRC Resident Inspector. | ||
| ENS 50045 | 19 April 2014 15:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Assessment Capability Due to Planned Maintenance on Main Steam Line Radiation Monitors | Main steam line radiation monitors RM-4299A, RM4299B, RM4299C will be removed from service for a period of approximately 4 days during planned maintenance on the power supplies. This constitutes a loss of assessment capability. The radiation monitors will be returned to service following maintenance. The licensee has notified the NRC Resident Inspector, the State of Connecticut, and the local government. | Main Steam Line | |
| ENS 50010 | 8 April 2014 13:51:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Stack Gas Effluent Radiation Monitor | At 0951 EDT Operators discovered that RM-8168 (Stack Gas Effluent Radiation Monitor) was inoperable due to a temporary loss of power to the motor. This resulted in a loss of assessment capability. The licensee followed the required steps in the Alarm Response Procedure and restored the Radiation Monitor to service at 1310 EDT. The licensee informed State/local agencies and the NRC Resident Inspector. | ||
| ENS 49997 | 4 April 2014 13:45:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack Radiation Monitor Removed from Service for Pre-Planned Maintenance | The Millstone Station Stack Radiation Monitor, RM-8169 was removed from service for pre-planned maintenance. This is reportable as a loss of assessment capability in accordance with 10 CFR 50.72 (b)(3)(xiii). RM-8169 was restored following pre-planned maintenance at 1150 EDT on 4/4/2014. The licensee notified the NRC Resident Inspector and applicable State and local agencies. | ||
| ENS 49952 | 24 March 2014 17:27:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack Radiation Monitor Removed from Service for Pre-Planned Maintenance | The Millstone Station Stack Radiation Monitor, RM-8169 was removed from service for pre-planned maintenance. This is reportable as a loss of assessment capability in accordance with 10 CFR 50.72 (b)(3)(xiii). RM-8169 was restored at 1539 EDT. The licensee notified the NRC Resident Inspector and applicable State and local agencies. | ||
| ENS 49951 | 24 March 2014 14:43:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Radiation Monitor Out of Service for Pre-Planned Maintenance | System affected: SLCRS (Supplementary Leakage Collection and Release System) radiation monitor. Actuations and their initiation signals: N/A. Causes: Pre-planned maintenance. Effect of event on plant: Ventilation process radiation for SLCRS. Actions taken or planned: Return to service within 24 hrs. Additional information: None. The licensee notified the NRC Resident Inspector and applicable State and local agencies. | ||
| ENS 49922 | 17 March 2014 14:25:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Millstone Station Main Steam Radiation Monitors Out of Service for Maintenance | At 1025 EDT on 3/17/14, the Millstone Station main steam radiation monitors were removed from service for pre-planned maintenance. This resulted in a degradation in the ability to detect steam generator tube leakage. The main steam radiation monitors will be returned to service within 79 hours. The licensee informed State/local agencies and the NRC Resident Inspector. | Steam Generator Main Steam | |
| ENS 49893 | 11 March 2014 13:31:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Millstone Station Stack Radmonitor Out-Of-Service for Pre-Planned Maintenance | At 0931 EDT on 3/11/14, the Millstone Station Stack Radmonitor RM-8168 was removed from service for pre-planned maintenance. This resulted in a loss of assessment capability and is being reported under 10 CFR 50.72 (b)(3)(xiii). The licensee informed State/local agencies and the NRC Resident Inspector. | ||
| ENS 49891 | 11 March 2014 11:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Normal Ventilation Process Radiation Monitor Out of Service for Planned Maintenance | Normal ventilation - normal and high range process radiation monitor, 3HVR*RE10A/B, has been removed from service for planned maintenance. The maintenance window is scheduled for 7 hours. The licensee notified the NRC Resident Inspector, the State of Connecticut Department of Environmental Protection, and Local police dispatch. | ||
| ENS 49854 | 25 February 2014 13:33:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Millstone Station Stack Radmonitor Out-Of-Service for Pre-Planned Maintenance | At 0833 EST on 2/25/14, the Millstone Station Stack Radmonitor RM-8169 was removed from service for pre-planned maintenance. This resulted in a loss of assessment capability and is being reported under 10 CFR 50.72 (b)(3)(xiii). At 1110 EST on 2/25/14, the maintenance was completed and the radmonitor restored to service. The licensee informed State/local agencies and the NRC Resident Inspector. | ||
| ENS 49837 | 18 February 2014 12:28:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Radiation Monitors Will Be Removed from Service for Pre-Planned Maintenance | The four Main Steam Line Radiation Monitors 3MSS*RE75, 3MSS*RE76, 3MSS*RE77 and 3MSS*RE78 along with Terry Turbine Aux Feedwater Steam Exhaust Radiation Monitor 3MSS*RE79 will be removed from service to support a scheduled design change. This condition is reportable per 10CFR50.72(b)(3)(xiii). This equipment is expected to be restored to service within 72 hours. The licensee informed the NRC Resident Inspector. | Feedwater Main Steam Line | |
| ENS 49823 | 12 February 2014 15:47:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | High Range Stack Radiation Monitor Removed from Service for Planned Maintenance | At 1047 EST on 2/12/14, Millstone Unit 2 removed the Stack High Range Radiation Monitor, RM 8168, from service for pre-planned maintenance. Functional test was completed and operability was restored at 1426 EST on 2/12/2014. The licensee informed the Connecticut Department of Environmental Protection, Waterford Dispatch and the NRC Resident Inspector. | ||
| ENS 49790 | 4 February 2014 13:54:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack Radiation Monitor Non-Functional for Pre-Planned Maintenance | The Millstone Station Stack Radiation Monitor, RM-8169, was removed from service at 0854 EST for pre-planned maintenance. The Stack Radiation Monitor will be restored to service after maintenance. The licensee informed the Connecticut Department of Environmental Protection, Waterford Dispatch and the NRC Resident Inspector. | ||
| ENS 49767 | 27 January 2014 14:37:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Radiation Monitor Removed from Service for Planned Maintenance | Supplementary Leakage Collection and Release system (SLCRS) Radiation monitor, 3HUR-RE10A/B, is being removed from service for planned maintenance. Radiation monitor is scheduled to be returned to service on February 2, 2014. The Licensee notified the NRC Resident Inspector, the State Department of Environmental Protection, and the town of Waterford.
The licensee called to correct the identification number of the SLCRS radiation monitor. The SLCRS radiation monitor identification number should be 3HVR 19A/B. Notified R1DO (Burritt). | ||
| ENS 49726 | 15 January 2014 15:19:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | High Range Stack Radiation Monitor Removed from Service for Planned Maintenance | Millstone Unit 2 (removed the) High Range Stack Radiation Monitor, RM 8168, (from service for) pre-planned maintenance. RM 8168 (was) restored to operable at 1157 (EST) on 1/15/2014. The licensee informed State and local agencies and the NRC Resident Inspector. | ||
| ENS 49724 | 15 January 2014 14:48:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Normal Ventilation Radiation Monitor Removed from Service for Planned Maintenance | (The) Normal Ventilation Normal Range Process Radiation Monitor 3HVR*RE10B (was) removed from service for planned maintenance. (The affected Radiation Monitor) will be returned to service following maintenance. The licensee informed State and local agencies and the NRC Resident Inspector. | ||
| ENS 49719 | 13 January 2014 13:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Radiation Monitor Out of Service for Maintenance | The normal ventilation high range process radiation monitor, 3HVR*10A, was removed for service for planned maintenance. The radiation monitor will be returned to service following maintenance. The NRC Resident Inspector has been notified. | ||
| ENS 49693 | 6 January 2014 13:51:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Radiation Monitor Taken Out of Service for Planned Maintenance | The Supplementary Leakage Collection and Release System ventilation process flow radiation monitor 3HVR*RE19A has been removed from service for pre-planned maintenance. The monitor will be returned to service after maintenance is complete. The NRC Resident Inspector, state, and local agencies have been informed. | ||
| ENS 49684 | 31 December 2013 16:12:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack Radiation Monitor Non-Functional for Pre-Planned Maintenance | The Millstone Station Stack Radiation Monitor, RM-8169, was removed from service at 1112 EST for pre-planned maintenance. The expected return to service time is 1400 EST. The licensee informed the Connecticut Department of Environmental Protection, Waterford Dispatch and the NRC Resident Inspector. | ||
| ENS 49642 | 17 December 2013 15:15:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack Radiation Monitor Removed from Service for Preplanned Maintenance | 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 49604 | 3 December 2013 15:22:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Stack Radiation Monitor Non-Functional for Pre-Planned Maintenance | The Millstone Station Stack Radiation Monitor, RM-8169, was removed from service at 1022 EST for pre-planned maintenance. At 1304 EST, the monitor was returned to service. The licensee informed the Connecticut Department of Environmental Protection, Waterford Dispatch and NRC Resident Inspector. |