08-29-2016 | On July 5, 2016, at 1640 Eastern Daylight Time (EDT), the Unit 2 High Pressure Coolant Injection ( HPCI) system was declared inoperable due to apparent failure of the HPCI Auxiliary Oil Pump. The HPCI Auxiliary Oil Pump provides hydraulic pressure required to open the HPCI Turbine Stop Valve and the HPCI Turbine Control Valve during initial HPCI startup. Failure of the HPCI Auxiliary Oil Pump prevents the HPCI system from performing its safety function.
This condition is being reported in accordance with 10 CFR 50.73(a)(2)(v)(D), as an event or condition that could have prevented the fulfillment of the safety function of a system that is needed to mitigate the consequences of an accident.
The HPCI system inoperability was due to loss of control power for the Auxiliary Oil Pump. The loss of control power was caused by a failed motor overload alarm relay coil; which caused current flow in excess of the control power fuse rating. The HPCI system was restored on July 6, 2016, at 1050 EDT. The alarm relay coil failure was age related.
The corrective actions include creation of preventive maintenance tasks to replace the Unit 1 and 2 HPCI motor overload alarm relay coils on an appropriate frequency. |
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Category:Letter
MONTHYEARIR 05000324/20230112023-12-26026 December 2023 NRC Fire Protection Team Inspection - FPTI Report 05000324/2023011 and 05000325/2023011 IR 05000324/20234022023-12-14014 December 2023 Security Baseline Inspection Report 05000324-2023402 and 05000325-2023402 ML23297A0262023-11-27027 November 2023 Proposed Alternatives to ASME Code Section XI Subsection IWE Requirements for Torus Metallic Liner Inspections ML23317A3462023-11-14014 November 2023 Duke Fleet - Correction Letter to License Amendment Nos. 312 & 340 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-554, Revision 1 IR 05000324/20230032023-11-0101 November 2023 Integrated Inspection Report 05000324/2023003 and 05000325/2023003 IR 05000324/20230102023-10-17017 October 2023 Biennial Problem Identification and Resolution Inspection Report 05000324/2023010 and 05000325/2023010 IR 05000325/20234012023-10-16016 October 2023 Security Baseline Inspection Report 05000324 and 05000325 2023401 ML23346A1322023-10-0606 October 2023 Communication from C-10 Research & Education Foundation Regarding NextEra Common Emergency Fleet Plan License Amendment Request and Related Documents Subsequently Published ML23256A0882023-09-25025 September 2023 Issuance of Alternative to Steam Generator Welds ML23195A0782023-08-29029 August 2023 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-554, Revision 1 IR 05000324/20230052023-08-23023 August 2023 Updated Inspection Plan for Brunswick Steam Electric Plant, Units 1 and 2 (Report 05000324/2023005 and 05000325/2023005) IR 05000324/20230022023-08-0404 August 2023 Integrated Inspection Report 05000324/2023002 and 05000325/2023002 ML23201A2042023-07-28028 July 2023 Summary of Regulatory Audit in Support of Alternative Request RA-22-0308 for Inservice Inspection of the Torus Metallic Liner IR 05000324/20243012023-07-25025 July 2023 Notification of Licensed Operator Initial Examination 05000325/2024301 and 05000324/2024301 ML23212B2682023-07-25025 July 2023 Notification of Licensed Operator Initial Examination 05000325/2024301 and 05000324/2024301 ML23146A0012023-05-24024 May 2023 EN 56538 - Engine Systems Inc and Brunswick ML23212A9502023-05-24024 May 2023 Engine Systems, Inc., Part 21 Report Re Woodward EGB-35P Governor/Actuator with Foreign Material ML23130A3902023-05-12012 May 2023 Regulatory Audit Plan in Support of Alternative Request RA 22-0308 for Inservice Inspection of the Torus Metallic Liner IR 05000324/20230012023-05-10010 May 2023 Integrated Inspection Report 05000324 2023001 and 05000325 2023001 ML23118A0762023-05-0101 May 2023 Approval for Use of Specific Provision of a Later Edition of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section XI IR 05000324/20220042023-04-0404 April 2023 Reissue - Brunswick Steam Electric Plant - Integrated Inspection Report 05000324/2022004 and 05000325/022004 ML22332A4932023-03-10010 March 2023 William States Lee III 1 and 2 - Issuance of Amendments Regarding the Relocation of the Emergency Operations Facility IR 05000324/20220062023-03-0101 March 2023 Annual Assessment Letter for Brunswick Steam Electric Plant, Units 1 and 2 NRC Inspection Reports 05000324/2022006 and 05000325/2022006 ML23033A5252023-02-0808 February 2023 Integrated Inspection Report 05000324/2022004 and 05000325/2022004 IR 05000324/20223012023-02-0303 February 2023 NRC Operator License Examination Report 05000325/2022301 and 05000324/2022301 IR 05000324/20224022022-11-23023 November 2022 Security Baseline Inspection Report 05000324 2022402 and 05000325 2022402 ML22332A0132022-11-23023 November 2022 Operator Licensing Written Examination Approval 05000325/2022301 and 05000324/2022301 ML22096A0032022-11-18018 November 2022 McGuire Nuclear Station and Shearon Harris Nuclear Power Plant Authorization of RA-19-0352 Regarding Use of Alternative for RPV Head Closure Stud Examinations ML22256A2532022-11-14014 November 2022 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-541, Rev. 2 IR 05000324/20224032022-11-10010 November 2022 Cyber Security Inspection Report 05000324/2022403 and 05000325/2022403 ML22307A1762022-11-0707 November 2022 Notification of an NRC Fire Protection Team Inspection (FPTI) IR 05000324/20220032022-11-0707 November 2022 Integrated Inspection Report 05000324/2022003 and 05000325/2022003 ML22258A0302022-09-15015 September 2022 Evacuation Time Estimate Reports IR 05000324/20220052022-08-24024 August 2022 Updated Inspection Plan for Brunswick Steam Electric Plant (Report 05000324/2022005 and 05000325/2022005) ML22230D0692022-08-22022 August 2022 Documentation of the Completion of Required Actions Taken in Response to the Lessons Learned from the Fukushima Dai-ichi Accident IR 05000324/20220022022-08-0505 August 2022 Integrated Inspection Report 05000324/2022002 and 05000325/2022002 IR 05000324/20220102022-06-27027 June 2022 Design Basis Assurance Inspection (Teams) Inspection Report 05000324 2022010 and 05000325 2022010 ML22028A1742022-05-12012 May 2022 Issuance of Amendment Nos. 309 and 337 Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-580, Revision 1 IR 05000324/20220012022-05-10010 May 2022 Integrated Inspection Report 05000324/2022001 and 05000325/2022001 ML22119A1352022-05-0909 May 2022 Information Request for the Cyber-Security Baseline Security Inspection, Notification to Perform Inspection 05000325/2022403; 05000324/2022403 ML22082A2682022-05-0202 May 2022 Issuance of Amendment Nos. 308 and 336 Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-505, Revision 2 ML22102A0502022-04-11011 April 2022 301 Corporate Notification Letter IR 05000324/20224012022-03-16016 March 2022 Security Baseline Inspection Report 05000324/2022401 and 05000325/2022401 ML22054A2152022-03-0808 March 2022 Correction to Amendments to Revise Standby Liquid Control System Boron Solution Storage Tank Volume Technical Specifications IR 05000324/20210062022-03-0202 March 2022 Annual Assessment Letter for Brunswick Steam Electric Plant, Units 1 and 2 (Reports No. 05000324/2021006 and 05000325/2021006) IR 05000324/20210042022-02-14014 February 2022 Integrated Inspection Report 05000324/2021004 and 05000325/2021004 ML22035A1262022-02-0909 February 2022 Withdrawal of Exemption Request from the Requirements of 10 CFR Part 50, Appendix E, Section IV.F.2.d (EPID L-2021-LLE-0055 (COVID-19)) ML21354A5032022-01-24024 January 2022 Requested Exemption from 10 CFR 50, Appendix E, Section IV.F.2.D Not Required (EPID L-2021-LLE-0055 (COVID-19)) ML22018A1842022-01-18018 January 2022 Notification of Brunswick Steam Electric Plant, Units 1 & 2 - Design Bases Assurance Inspection - U.S. Nuclear Regulatory Inspection Report 05000324/2022010 and 05000325/2022010 ML21348A7192021-12-21021 December 2021 Regulatory Audit Summary Regarding License Amendment Request to Revise Technical Specifications to Adopt Risk-Informed Completion Times 2023-09-25
[Table view] Category:Licensee Event Report (LER)
MONTHYEAR05000324/LER-2017-0032017-08-0303 August 2017 1 OF 4, LER 17-003-00 for Brunswick, Unit 2, Regarding Setpoint Drift in Main Steam Line Safety/Relief Valves Results in Three Valves Inoperable, 05000325/LER-2017-0032017-08-0202 August 2017 Control Room Air Conditioning and Emergency Ventilation Systems Rendered Inoperable, LER 17-003-00 for Brunswick, Unit 1, Regarding Control Room Air Conditioning and Emergency Ventilation Systems Rendered Inoperable 05000324/LER-2017-0022017-06-12012 June 2017 Plant Mode Change with Primary Containment Inoperable, LER 17-002-00 for Brunswick, Unit 1, Regarding Foreign Material in Switch Results in Unplanned Automatic Start of Emergency Diesel Generators 05000324/LER-2017-0012017-05-18018 May 2017 Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3, LER 17-001-00 for Brunswick, Unit 2, Regarding Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3 05000324/LER-2016-0012016-08-0808 August 2016 Mispositioned Valves Result in Residual Heat Removal Service Water System Inoperability, LER 16-001-00 for Brunswick Steam Electric Plant, Unit 2, Regarding Mispositioned Valves Result in Residual Heat Removal Service Water System lnoperability 05000325/LER-2016-0032016-05-0202 May 2016 Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3, LER 16-003-00 for Brunswick Steam Electric Plant, Unit 1 Regarding Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3 05000324/LER-2016-0022016-05-0202 May 2016 High Pressure Coolant Injection System Inoperable due to Failed Relay Coil, LER 16-002-00 for Brunswick Steam Electric Plant (BSEP), Units 1 and 2, Regarding Emergency Diesel Generator 3 Inoperable Due to Failure to Auto-Start 05000325/LER-2016-0012016-04-0606 April 2016 Electriqal Bus Fault Results in Lockout of Startup Auxiliary Transformer and Loss of Offsite Power, LER 16-001-00 for Brunswick, Unit 1, Regarding Electrical Bus Fault Results in Lockout of Startup Auxiliary Transformer and Loss of Offsite Power BSEP 15-0088, Special Report, Technical Specification 5.6.6, Post Accident Monitoring (PAM) Instrumentation Report2015-10-22022 October 2015 Special Report, Technical Specification 5.6.6, Post Accident Monitoring (PAM) Instrumentation Report ML1019404522008-06-0303 June 2008 10CFR50.75g File: AR00237296 Overflowed CST ML1019404542008-05-13013 May 2008 10CFR50.75g File: AR00272173 Thru Wall Leak in Cw Intake Pipe Was Found to Contain Tritium in the Groundwater Leaking Into the Pipe ML1019404562008-04-28028 April 2008 10CFR50.75g File: AR00242461 Routine Environmental Soil/Water Sampling Has Identified Low Levels of Tritium . BSEP 03-0023, LER 2002-02-00 from Brunswick, Unit 2 Regarding Remote Shutdown Panel Power Supply Inventer Design Deficiency2003-02-14014 February 2003 LER 2002-02-00 from Brunswick, Unit 2 Regarding Remote Shutdown Panel Power Supply Inventer Design Deficiency 2017-08-03
[Table view] |
comments regarding burden estimate to the FOIA, Privacy and Information Collections Branch (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
Brunswick Steam Electric Plant (BSEP), 002 05000-324 2016 - 00 Energy Industry Identification System (EIIS) codes are identified in the text as [XX].
Background
Initial Conditions At the time of this event, Unit 2 was in Mode 1 at approximately 100 percent of rated thermal power. The Reactor Core Isolation Cooling (RCIC) system [BN], Automatic Depressurization System (ADS), Low Pressure Coolant Injection (LPCI) system [BO], and Core Spray (CS) system [BM] were operable at the time of the event.
Reportability Criteria This condition is being reported in accordance with 10 CFR 50.73(a)(2)(v)(D), as an event or condition that could have prevented the fulfillment of the safety function of a system that is needed to mitigate the consequences of an accident. The NRC was initially notified of this event on July 5, 2016 (i.e., Event Number 52064).
Event Description
On July 5, 2016, at 1640 Eastern Daylight Time (EDT), the Unit 2 High Pressure Coolant Injection (HPCI) system [BJ] was declared inoperable after the control room received annunciator 2-A-1 (3-3), "HPCI Aux Oil Pump Motor Overload." Upon further investigation, it was determined that the HPCI Auxiliary Oil Pump motor overload alarm relay (i.e., 2-2XDA-B11-74) had failed and blown the associated control circuit fuse (i.e., 2-2XDA-B11-2FU). The HPCI Auxiliary Oil Pump provides hydraulic pressure required to open the HPCI Turbine Stop Valve and the HPCI Turbine Control Valve during initial HPCI startup. With failure of the relay, the HPCI Auxiliary Oil Pump was incapable of starting; rendering the HPCI system inoperable.
Operability of the HPCI system was restored on July 6, 2016, at 1050 EDT.
Event Cause The cause of the Unit 2 HPCI inoperability was determined to be age related failure of HPCI Auxiliary Oil Pump motor overload alarm relay (i.e., 2-2XDA-B11-74) coil.
The failed relay is normally energized and was original plant equipment. The equipment reliability classification was "Important" as opposed to "Critical." Based on this classification, preventive maintenance had not been performed to replace the Unit 2 relay.
The Unit 1 HPCI Auxiliary Oil Pump motor overload alarm relay was last replaced in January 1995.
comments regarding burden estimate to the FOIA, Privacy and Information Collections Branch (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
Brunswick Steam Electric Plant (BSEP), 05000-324
3. LER NUMBER
002 2016 00 Safety Assessment The safety significance of this event was minimal. The RCIC system, ADS, LPCI system, and CS system were all operable at the time of the event. The HPCI system was restored to operable status within the 14-day Technical Specification Completion Time.
Corrective Actions
Any changes to the corrective actions and schedules noted below will be made in accordance with the site's corrective action program.
The following corrective actions have been completed or are planned.
- Operability of the HPCI system was restored on July 6, 2016, at 1050 EDT.
- Preventive Maintenance tasks to replace the Unit 1 and Unit 2 HPCI Auxiliary Oil Pump motor overload relays, on an appropriate frequency, will be created. This is currently scheduled to be completed by November 4, 2016.
- The equipment reliability classifications for the Unit 1 and Unit 2 HPCI Auxiliary Oil Pump motor overload relays will be changed to "Critical." This is currently scheduled to be completed by November 11, 2016.
- A review of control wiring diagrams for Mitigating Systems Performance Index (MSPI) monitored components will be performed to identify components with "Important" equipment reliability classification. This review will either document classification is correct or change to critical if appropriate and implement appropriate preventive maintenance strategies. This is currently scheduled to be completed by December 15, 2016.
Previous Similar Events
A review of LERs and condition reports for the past five years identified the following previous similar occurrences.
- LER 1-2015-001, Revision 1, dated December 21, 2015, reported inoperability of the Unit 1 HPCI system due to a faulty magnetic motor contactor coil (i.e., M-coil) within the HPCI turbine auxiliary oil pump motor contactor 1-1XDA-B11-M. The failure of the coil was determined to be most likely long term thermal cycling. The coil was replaced and the HPCI system was returned to operable status on February 20, 2015. Based on the age of the M-coil, a one-time replacement is expected to prevent recurrence of this failure through the end of licensed operation for BSEP. Therefore, no periodic replacement was recommended. Corrective actions associated with this LER were component level/function level and, therefore, would not be expected to prevent recurrence of HPCI system inoperability.
comments regarding burden estimate to the FOIA, Privacy and Information Collections Branch (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to NEOB-10202, (3150.0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
Brunswick Steam Electric Plant (BSEP), 002 05000-324 2016 - 00
- LER 1-2012-004, dated June 29, 2012, reported HPCI system inoperability due to the erratic HPCI governor operation caused by a failed ramp generator signal converter (RGSC) operational amplifier. The root cause of the RGSC failure is the lack of a replacement preventive maintenance (PM) task for the RGSC. The corrective action to prevent recurrence for this event was to establish the appropriate PM for periodic replacement of the RGSC on both units' HPCI systems. Corrective actions associated with this LER were component level/function level and, therefore, would not be expected to prevent recurrence of HPCI system inoperability.
Commitments No regulatory commitments are contained in this report.
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05000325/LER-2016-001 | Electriqal Bus Fault Results in Lockout of Startup Auxiliary Transformer and Loss of Offsite Power LER 16-001-00 for Brunswick, Unit 1, Regarding Electrical Bus Fault Results in Lockout of Startup Auxiliary Transformer and Loss of Offsite Power | 10 CFR 50.73(a)(2)(iv)(A), System Actuation | 05000324/LER-2016-001 | Mispositioned Valves Result in Residual Heat Removal Service Water System Inoperability LER 16-001-00 for Brunswick Steam Electric Plant, Unit 2, Regarding Mispositioned Valves Result in Residual Heat Removal Service Water System lnoperability | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications | 05000325/LER-2016-002 | Emergency Diesel Generator 3 Inoperable Due to Failure to Auto-Start | 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications | 05000324/LER-2016-002 | High Pressure Coolant Injection System Inoperable due to Failed Relay Coil LER 16-002-00 for Brunswick Steam Electric Plant (BSEP), Units 1 and 2, Regarding Emergency Diesel Generator 3 Inoperable Due to Failure to Auto-Start | 10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | 05000325/LER-2016-003 | Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3 LER 16-003-00 for Brunswick Steam Electric Plant, Unit 1 Regarding Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3 | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications | 05000325/LER-2016-004 | Tornado Missile Vulnerability Results in Condition Prohibited by Technical Specifications | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications | 05000325/LER-2016-005 | Drywell High Range Radiation Monitors Inoperable due to Thermally Induced Current Phenomenon | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications | 05000325/LER-2016-006 | Control Room Air Conditioning Units Inoperable due to Corroded Supports | 10 CFR 50.73(a)(2)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
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