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 Entered dateSiteRegionReactor typeEvent description
ENS 5375225 November 2018 02:47:00MillstoneNRC Region 1

EN Revision Text: LOSS OF CONTROL ROOM ENVELOPE DUE TO DOOR FAILURE On 11/24/18 at 2015 EST, a loss of Control Room Envelope (CRE) was declared due to failure of the control room boundary door, 204-36-008. (Abnormal Operating Procedure 8588A Mitigating Actions for Control Boundary Breach was implemented). The door was repaired at 2030 EST, restoring CRE to operable (status). A mechanical failure of the control room door latch prevented the door from closing. The licensee notified the NRC Resident Inspector.

  • * * RETRACTION ON 01/18/19 AT 1457 EST FROM GARY CLOSIUS TO JEFFREY WHITED * * *

The purpose of this call is to retract a report made on November 25, 2018, NRC Event Number EN53752. NRC Event Report number EN53752 describes a condition at Millstone Power Station Unit 2 (MPS2) in which a control room envelope boundary door was discovered to not be able to fully close due to the latching mechanism being stuck in the extended position. The condition was reported to the NRC pursuant to 10 CFR 50.72(b)(3)(v)(D) via an 8-hour prompt report as an event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident. Upon further review, MPS2 determined that there was no loss of safety function. An engineering evaluation determined that even with the control room boundary door unable to be fully closed due to the latching mechanism being stuck in the extended position, control room air in-leakage would not have been sufficient to prevent the control room emergency ventilation system from performing its safety function. Therefore, this condition is not reportable and NRC Event Number EN53752 is being retracted. The basis for this conclusion has been provided to the NRC Resident Inspector. Notified the R1DO (Carfang).

ENS 5368823 October 2018 04:17:00MillstoneNRC Region 1On October 22, 2018 at 2241 hrs. EDT, a loss of Control Room Envelope (CRE) was declared due to failing to meet the requirements of (surveillance requirement) SR 4.7.6.1h during 72-month surveillance testing. Measured in-leakage exceeded the SR acceptance value. Abnormal Operating Procedure 2588A, 'Mitigating Actions for Control Room Envelope Boundary Breach', have been implemented. The licensee has notified Connecticut Department of Environmental Protection, Connecticut dispatch, Waterford dispatch, and the NRC Resident Inspector of this event.
ENS 535332 August 2018 13:09:00MillstoneNRC Region 1The following was received via telephone and email notification from Millstone Power Station: Millstone Power Station Unit 3, identified that the underground pipe to the Condensate Surge Tank had leaked greater than 100 gallons of water that included trace amounts of tritium to the ground. The effected piping is inside the protected area and has been isolated and drained. No tritium has been detected in any monitoring wells outside of the Protected Area. There is no threat to employees or the public or impact to drinking water. The Connecticut Department of Energy and Environmental Protection, and the towns of Waterford and East Lyme were notified at approximately 1300 (EDT) on August 2, 2018. The licensee notified the NRC Resident Inspector.
ENS 5342827 May 2018 00:40:00MillstoneNRC Region 1CE
Westinghouse PWR 4-Loop
County and state governments were notified due to the spurious actuation of a single emergency notification siren located in New London County in the Town of Lyme. The siren was silenced. If required, alternate notification of the public in the area will be through local Emergency Operations Center route alerting. The NRC Resident Inspector has been notified.
ENS 5332812 April 2018 17:36:00MillstoneNRC Region 1Westinghouse PWR 4-LoopAt 1148 EDT on April 12, 2018, a 16.2 ounce bottle of Kombucha tea was found in a small refrigerator in the Administration Building inside the Protected Area. The bottle was found to have a small amount missing from the contents. Kombucha tea is a fermented tea containing trace amounts of alcohol, and is legally sold without restrictions. Dominion Energy Nuclear Connecticut had previously notified its workforce that Kombucha tea was prohibited from being consumed or carried onsite. The owner has not yet been determined. This is considered an alcoholic beverage and is being reported pursuant to the requirements of 10 CFR 26.719 as a 24 hour report. The NRC Resident Inspector, the State of Connecticut, and local authorities have been notified.
ENS 5322925 February 2018 11:24:00MillstoneNRC Region 1Westinghouse PWR 4-LoopA non-licensed employee was found in violation of the sites Fitness for Duty Policy. The employee's access authorization to the plant has been terminated. The NRC Resident Inspector has been notified.
ENS 530059 October 2017 14:23:00MillstoneNRC Region 1Westinghouse PWR 4-Loop

While troubleshooting a hydrogen differential pressure gauge, operators found a hydrogen concentration greater than the lower explosive limit (4% hydrogen concentration). The licensee evacuated the turbine building. The licensee is ventilating the area to allow personnel access to isolate and repair the leak. The plant Fire Brigade is on standby. This event was declared for GU-2: release of toxic or flammable gas. The main generator pressure and hydrogen concentration are stable. The licensee notified the NRC Resident Inspector. Notified DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).

  • * * UPDATE AT 1630 EDT ON 10/9/2017 FROM NORMAN KUZEL TO MARK ABRAMOVITZ * * *

The unusual event was terminated at 1617 EDT because the leak was isolated and the hydrogen concentration in the Hydrogen Control Cabinet was zero percent. The licensee notified the NRC Resident Inspector. Notified the R1DO (Jackson), IRD MOC (Stapleton), NRR (King), DHS SWO, FEMA Operations Center, DHS NICC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).

ENS 529486 September 2017 14:11:00MillstoneNRC Region 1Westinghouse PWR 4-LoopInspection of an underground pipe used to discharge the contents of the Unit 3 Condensate Polishing Facility in accordance with the National Pollutant Discharge Elimination System (NPDES) Discharge Permit identified the potential for small amounts of water containing tritium and Secondary chemicals to be released to the ground within the plant Protected Area. The water met all permit limits for discharge to the normal discharge point. Groundwater tritium levels were well below reportable limits. The line has been removed from service. The Connecticut Department of Energy and Environmental Protection was notified at 1115 (EDT) on September 6, 2017. This event is being reported in accordance with 10CFR50.72(b)(2)(xi) for 'Any event or situation, related to the health and safety of the public or onsite personnel, or protection of the environment, for which a news release is planned or notification to other government agencies has been or will be made.
ENS 5290415 August 2017 08:07:00MillstoneNRC Region 1CE

On August 15, 2017 at 0748 EDT, an Unusual Event was declared at Millstone Unit 2 due to a fire alarm indication in containment that was unable to be verified extinguished within 15 minutes. Current containment parameters do not indicate an actual fire. A containment entry is planned to verify that there is no fire. Unit 2 continues at 100% power. Unit 3 was unaffected. The NRC remains in Normal mode. The licensee notified the NRC Resident Inspector and State and local government agencies. Notified DHS SWO, FEMA Ops Center, DHS NICC. Notified FEMA National Watch and Nuclear SSA via E-mail.

  • * * UPDATE FROM TODD STRINGFELLOW TO DONALD NORWOOD AT 0953 EDT ON 8/15/2017 * * *

At 0951 EDT, the Unusual Event was terminated. No signs of an actual fire were present upon containment entry. All alarms are cleared and they are investigating the cause of the alarm. The licensee notified the NRC Resident Inspector and State and local government agencies. Notified R1DO (Gray), NRR EO (Miller), and IRD (Gott). Notified DHS SWO, FEMA Ops Center, DHS NICC. Notified FEMA National Watch and Nuclear SSA via E-mail.

ENS 5250120 January 2017 16:02:00MillstoneNRC Region 1Westinghouse PWR 4-LoopAt 0835 (EST) on January 20, 2017, at Millstone Power Station Unit 3, subsequent to personnel passage through a door in the auxiliary building, the door failed rendering it unable to completely close. At this time, in accordance with Technical Specification 3.6.6.2 "Secondary Containment," the Shift Manager declared the secondary containment inoperable. The door was repaired and the door completely closed at 1256 (EST) on January 20, 2017, and secondary containment was declared operable. Since Secondary Containment was rendered inoperable, Dominion is reporting that this condition could have prevented the fulfillment of the safety function to control the release of radioactive material and mitigate the consequences of an accident. This condition is being reported pursuant to 10 CFR 50.72(b)(3)(v)(C) and 10 CFR 50.72(b)(3)(v)(D). The NRC Senior Resident Inspector has been notified.
ENS 5216911 August 2016 11:09:00MillstoneNRC Region 1CEReactor operators manually tripped the reactor due to the loss of two out of four circulating water pumps which caused a drop in condenser vacuum. The trip was uncomplicated. The reactor is shutdown and stable with decay heat removal via steam dumps to the condenser. The cause of the circulating water pump trips is currently unknown, but initial indications are that the pumps tripped due to a lightning strike that caused an electrical perturbation. The reactor will remain shutdown while the licensee investigates the cause. Unit 3 was not affected. The licensee notified the NRC Resident Inspector and the State and Local governments.
ENS 5192915 May 2016 07:08:00MillstoneNRC Region 1Westinghouse PWR 4-Loop

At 0638 EDT on 5/15/2016, an Unusual Event (EAL GU.2) was declared on Millstone Unit 3 due to a Main Generator hydrogen gas leak into the Turbine Building. At 0645 EDT, operators manually tripped the reactor. All rods inserted. All systems functioned as expected following the reactor trip. Operators are currently venting the remaining hydrogen from the generator through the normal vent path. There is no safety related equipment out-of-service. The plant is in a normal post-trip electrical line-up. All Emergency Diesel Generators are available. The licensee notified the State of Connecticut and the NRC Resident Inspector. Notified DHS SWO, FEMA Ops Center, and DHS NICC Watch Officer. Notified via E-mail FEMA National Watch Center and NuclearSSA.

  • * * UPDATE FROM MIKE CICCONE TO HOWIE CROUCH AT 1044 EDT ON 5/15/16 * * *

At 0949 EDT, the licensee terminated the Unusual Event. At 0645 EDT on 5/15/16, a manual reactor trip was initiated at Millstone Unit 3 due to a hydrogen leak from the main generator. As expected, Auxiliary Feedwater System (AFW) initiated on the reactor trip. The trip was uncomplicated and the plant is currently in Mode 3 with a normal electric lineup and decay heat is being removed via steam dumps to the condenser. The cause of the hydrogen leakage is under investigation. This is reportable under 10 CFR 50.72(b)(2)(iv)(B) - RPS actuation while critical, and 10 CFR 50.72 (b)(3)(iv)(A) - valid specified system actuation. The licensee has notified Waterford Township, the State of Connecticut and the NRC Resident Inspector. Notified R1DO (Burritt), NRR ET (McDermott), NRR EO (Morris), IRD (Grant), DHS SWO, FEMA Ops Center, DHS NICC, FEMA National Watch Center (email) and NuclearSSA (email).

ENS 5188928 April 2016 00:15:00MillstoneNRC Region 1CEOn April 27, 2016 at 20:07 (EDT), a high energy line break (HELB) door between the turbine driven auxiliary feedwater pump and the motor driven auxiliary feedwater pump rooms was discovered open and unattended. In the event of a HELB, this condition could have rendered both trains of auxiliary feedwater inoperable. The boundary was not operable for approximately 1 hour. Upon discovery, the door was closed restoring the boundary. This event is being reported pursuant to 10 CFR 50.72(b)(3)(v) as any event or condition that alone could have prevented the fulfillment of the safety function of structures or systems that are needed to: (B) Remove residual heat; and (D) Mitigate the consequences of an accident. The NRC Senior Resident Inspector has been notified. The Licensee notified the Connecticut DEEP and Waterford Dispatch.
ENS 518609 April 2016 23:14:00MillstoneNRC Region 1Westinghouse PWR 4-LoopDuring pre-planned surveillance testing of the Supplementary Leak Collection and Release System (SLCRS), an issue was found affecting the Secondary Containment boundary. Millstone Unit 3 is being moved to Mode 5 for a refuel outage where investigation and repairs will be made. This is reportable under 10CFR50.72(b)(3)(v)(C), a condition that could have prevented the fulfillment of a safety function for systems or structures to control the release of radioactive material, and 10CFR50.72(b)(3)(v)(D) to mitigate the consequences of an accident. The surveillance testing was being performed while Millstone 3 was being removed from service for an upcoming Refueling Outage. The licensee has notified the NRC Resident Inspector and State and Local authorities.
ENS 5168225 January 2016 03:21:00MillstoneNRC Region 1Westinghouse PWR 4-LoopAt 0147 EST on 1/25/16, the 'B' Reactor Coolant Pump (RCP) tripped offline. This caused a reactor trip on low coolant flow. As expected, the Aux Feedwater System (AFW) initiated on the reactor trip. The trip was uncomplicated and the plant is currently shutdown in Mode 3 with a normal electrical lineup and decay heat is being removed via steam dumps to the condenser. The cause of the 'B' RCP trip is under investigation. A containment entry is planned for dayshift on 1/25/16 to inspect and troubleshoot the 'B' RCP. The Licensee has notified the NRC Resident Inspector.
ENS 516322 January 2016 23:56:00MillstoneNRC Region 1Westinghouse PWR 4-LoopMillstone Unit 3 reported a non spill related environmental fish kill event with greater than 300 fish found in the trash basket. The cause of the fish kill is unknown at this time. The type of fish reported was Atlantic Menhaden. The NRC Resident Inspector has been notified.
ENS 515218 November 2015 02:55:00MillstoneNRC Region 1CEDuring power ascension following refueling outage, a decreasing oil level in the 'C' Reactor Coolant Pump was noted. When the oil level reached 69 percent, with the reactor at approximately 56 percent rated thermal power, per plant procedure, a rapid downpower was initiated which brought the plant to approximately 15 percent power and a manual reactor trip was initiated at that point. The reactor trip was uncomplicated and all plant equipment responded as expected. The licensee notified the NRC Resident Inspector.
ENS 515134 November 2015 11:56:00MillstoneNRC Region 1Westinghouse PWR 4-Loop

At 1133 EST on 11/4/15, an Alert was declared due to a fire in the 'A' Emergency Diesel Generator (EDG) enclosure. Fire caused damage to the safety related EDG and was declared inoperable. The fire is out, and off-site assistance was not necessary. A fire watch has been stationed, and no personnel injuries were reported. The licensee has notified the NRC Resident Inspector. Notified DHS, FEMA, USDA, HHS, DOE, DHS NICC, EPA EOC, FEMA NWC (via email), FDA EOC (via email) and Nuclear SSA (via email).

  • * * UPDATE ON 11/4/15 AT 1449 EST FROM HERB SEARLE TO DONG PARK * * *

At 1446 EST on 11/4/15, Millstone Unit 3 terminated the Alert declaration following satisfactory atmospheric samples at the site boundary and notifying the State of Connecticut. The licensee will notify the NRC Resident Inspector. Notified R1DO (Rogge), NRR EO (Morris), and IRD (Grant). Notified DHS, FEMA, USDA, HHS, DOE, DHS NICC, EPA EOC, FEMA NWC (via email), FDA EOC (via email) and Nuclear SSA (via email).

ENS 514484 October 2015 10:03:00MillstoneNRC Region 1CE

At 0932 EDT on 10/4/15, the licensee declared an Unusual Event for identified RCS (Reactor Coolant System) leakage exceeding 25 gallons per minute (GPM), per EAL BU2, due to a relief valve leaking on the Shutdown Cooling System common header. The RCS leakage was within the capacity of the Charging System. At 0954 EDT the RCS leakage was terminated by isolating the Shutdown Cooling System. The cause of the relief valve failure is unknown and under investigation. The RCS cooldown was terminated and both RCS loops were restored to service for decay heat removal using both Steam Generators and the Main Condenser. Current RCS temperature is 248 degrees F with RCS pressure at 248 psig. All offsite power and EDGs (Emergency Diesel Generators) are available. The licensee intends to repair the relief valve to resume the RCS cooldown using the shutdown cooling system.. The licensee informed State and local agencies and the NRC Resident Inspector. Notified DHS SWO, DHS NICC, FEMA, and Nuclear SSA via email.

  • * * UPDATE AT 1115 EDT ON 10/04/15 FROM FRED PERKINS TO S. SANDIN * * *

The licensee terminated the Unusual Event at 1100 EDT, based on verification that the RCS leakage was stopped. The licensee informed State and local agencies and the NRC Resident Inspector. Notified R1DO (Bower), NRR EO (Morris), and IRD (Gott). Notified DHS SWO, DHS NICC, FEMA, and Nuclear SSA via email.

ENS 5135126 August 2015 21:44:00MillstoneNRC Region 1Westinghouse PWR 4-LoopA small brush fire occurred adjacent to an AMTRAK railroad right of way that passes through the Millstone Power Station owner controlled area, due to a downed tree branch that knocked down an AMTRAK electrified power line. The fire is outside the protected area of the site, and poses no public hazard or threat to building or structures. Outside assistance has been requested. Waterford Fire Department and AMTRAK have responded, and have eliminated the source and extinguished the fire. This report is being made pursuant of 10CFR50.72(b)(2)(xi). There is no radioactive release associated with this event. Dominion may respond to public inquiry, but no press release is planned. The NRC Resident Inspector has been notified. The Connecticut State Department of Energy and Environmental Protection and Waterford Dispatch were notified.
ENS 5126426 July 2015 22:08:00MillstoneNRC Region 1CEThe 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 5118728 June 2015 11:24:00MillstoneNRC Region 1CE

During Security checks of Control Room doors, a boundary door was found not latched. This door is capable of being manually closed and latched. The door was in this condition for 4 hours and 25 minutes. The door is currently closed and latched. This is being reported as it could have prevented the fulfillment of a safety function to mitigate the consequences of an accident per 10 CFR 50.72(b)(3)(v)(D). The NRC Resident Inspector has been notified. A condition report has been written and the door is posted to require manual checks to ensure it is latched until the door closing mechanism is repaired.

  • * * RETRACTION FROM THOMAS CLEARY TO VINCE KLCO ON 7/8/2015 AT 1314 EDT * * *

Event Report number 51187 describes a condition at Millstone Power Station Unit 2 (MPS2) in which a control room environmental boundary door was found unlatched. This was reported in accordance with 10CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of a safety function to mitigate the consequences of an accident. Upon further review, MPS2 has concluded that there was no loss of safety function, because even with the control room boundary door unlatched, the control room emergency ventilation system would have been able to perform its safety function during accident conditions. The MPS2 control room is pressure neutral and the hydraulic door closure mechanism was verified adequate to ensure the door would close and remain closed during accident conditions (even though it was not latching). Therefore, this condition is not reportable and NRC Event Number 51187 is being retracted. The basis for this conclusion will be provided to the NRC Resident Inspector. Notified the R1DO (Cahill).

ENS 5116117 June 2015 04:15:00MillstoneNRC Region 1Westinghouse PWR 4-Loop

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.

  • * * RETRACTION ON 07/01/2015 AT 1411 EDT FROM THOMAS CLEARY TO STEVEN VITTO * * *

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.

ENS 5114911 June 2015 22:28:00MillstoneNRC Region 1CE

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.

  • * * UPDATE FROM TOM CLEARY TO STEVEN VITTO ON 06/16/15 AT 1349 EDT * * *

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)

  • * * UPDATE FROM WILLIAM McCOLLUM TO DANIEL MILLS AT 1724 EDT ON 7/10/15 * * *

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 510353 May 2015 00:05:00MillstoneNRC Region 1Westinghouse PWR 4-LoopLoss 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 508739 March 2015 13:10:00MillstoneNRC Region 1CEOn 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 5084222 February 2015 02:36:00MillstoneNRC Region 1Westinghouse PWR 4-LoopThe 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 5084121 February 2015 21:35:00MillstoneNRC Region 1CEThe 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 5083620 February 2015 00:49:00MillstoneNRC Region 1Westinghouse PWR 4-LoopA High Energy Line Break (HELB) boundary door was discovered not latching. HELB boundary affects both trains of safety related (480V) switchgear and was not operable for approximately seven minutes. (The licensee) entered the technical specification action statement, restored the door to functional, and exited the technical specification action statement. The licensee notified the NRC Resident Inspector, the State of Connecticut and local officials.
ENS 507979 February 2015 11:05:00MillstoneNRC Region 1CEThe 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 5077528 January 2015 15:24:00MillstoneNRC Region 1CEThe 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 5076727 January 2015 00:24:00MillstoneNRC Region 1Westinghouse PWR 4-LoopNormal 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 5073715 January 2015 12:28:00MillstoneNRC Region 1Westinghouse PWR 4-Loop

On January 15, 2015 a high energy line break door affecting both trains of safety related switchgear rooms was discovered not latching after passage. The boundary was not operable for approximately 19 minutes. The door has been repaired. Dominion is reporting that this condition could have prevented the fulfillment of the safety function to mitigate the consequences of an accident pursuant to 10 CFR 50.72(b)(3)(v)(D).

The NRC Senior Resident Inspector has been notified. The State of Connecticut Department of Energy, and Environmental Protection and Waterford Dispatch were also notified.

ENS 507121 January 2015 22:02:00MillstoneNRC Region 1CE

During (surveillance) checks of Control Room doors, a boundary door did not latch after being accessed until the door was opened and closed. This is being reported as it could have prevented the fulfillment of a safety function to mitigate the consequences of an accident per 10CFR50.72(b)(3)(v)(D).

The door is currently closed and latched. The door was in this condition for between 5 and 10 seconds.

The licensee notified the Connecticut Department of Environmental Protection, Town of Waterford and the NRC Resident Inspector.

  • * * RETRACTION PROVIDED BY THOMAS CLEARY TO JEFF ROTTON ON 01/08/2015 AT 1539 EST * * *

Upon further review, Millstone Power Station Unit 2 has concluded that there was no loss of safety function, because even with the control room door latch degraded, the control room door and its closing mechanism would still be able to maintain the control room envelope's boundary intact. Therefore, this condition is not reportable and NRC Event Number 50712 is being retracted. The basis for this conclusion will be provided to the NRC Resident Inspector. The licensee notified the NRC Resident Inspector. Notified R1DO (Jackson).

ENS 5067612 December 2014 22:27:00MillstoneNRC Region 1Westinghouse PWR 4-LoopThe boundary door between the A and B safety related switchgear rooms was found not to be latching. This door is credited in the high energy line break (HELB) analysis. Both trains of safety related switchgear were affected for approximately 36 minutes. The technical specification action statement was entered, the door was repaired, and the action statement was exited. The licensee notified the NRC Resident Inspector.
ENS 5056825 October 2014 13:42:00MillstoneNRC Region 1Westinghouse PWR 4-LoopThe 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 5056724 October 2014 20:59:00MillstoneNRC Region 1Westinghouse PWR 4-LoopThe 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 5048323 September 2014 13:59:00MillstoneNRC Region 1CE(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 5044410 September 2014 14:20:00MillstoneNRC Region 1Westinghouse PWR 4-LoopLoss 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 504328 September 2014 10:42:00MillstoneNRC Region 1CEMillstone 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 5040627 August 2014 09:56:00MillstoneNRC Region 1Westinghouse PWR 4-LoopLoss 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 5040026 August 2014 11:54:00MillstoneNRC Region 1CEMillstone 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 5036013 August 2014 11:23:00MillstoneNRC Region 1CEA Control Room Boundary Door failed to latch and maintain the Control Room boundary. This condition was reportable in accordance with 10CFR50.72(b)(3)(v)(D). The door was repaired and the Control Room boundary was restored on 8/13/14 at 0552 (EDT). The licensee notified the NRC Resident Inspector, State of Connecticut, and local agencies.
ENS 5035712 August 2014 15:58:00MillstoneNRC Region 1CEMillstone 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 503435 August 2014 13:47:00MillstoneNRC Region 1CEUnit 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 5032931 July 2014 11:08:00MillstoneNRC Region 1CEAt 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 5031326 July 2014 15:14:00MillstoneNRC Region 1CEAt 1458 (EDT) on 7/26/14, the (Technical Specification) 72 hour action statement for TDAFWP (Turbine Driven Auxiliary Feedwater Pump) inoperable expires (LCO 3.7.1.1 Action C). Per Technical Specification Action Statement, plant is required to be in HOT STANDBY by 2058 on 7/26/14 (6 hours) and in HOT SHUTDOWN by 0858 on 7/27/14 (additional 12 hours). MPS (Millstone Power Station) Unit 2 shutdown (using normal procedures) has commenced at 1411 when troubleshooting and repairs were unable to determine and correct cause of low pump recirculation flow. Additional activities will continue to correct issue. Unit 3 is not affected by this event. All safety-related systems and equipment required for safe plant shutdown are available. The licensee notified the NRC Resident Inspector, Waterford Dispatch, and State of Connecticut Department of Energy and Environmental Protection.
ENS 5028115 July 2014 13:20:00MillstoneNRC Region 1CEThe 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 5024130 June 2014 16:06:00MillstoneNRC Region 1CEThe 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 5021119 June 2014 15:08:00MillstoneNRC Region 1Westinghouse PWR 4-LoopSystem 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.