On September 26, 2017, at approximately 0543 EDT, while performing 2B Emergency Diesel Generator ( EDG) and Emergency Safety Function Actuation System ( ESFAS) testing, a valid undervoltage actuation signal was sent to the Unit 2 B-Train Emergency Diesel Generator. The 2B AC emergency bus (2BA03) was load shed, the 2B EDG automatically started, and tied to 2BA03 The 2BA03 bus was loaded by the automatic load sequencer. The actuation was identified by the Control Room operators and the 2B EDG was locally monitored while in service.
An air leak on the shutdown logic board caused a non-emergency trip to actuate when the non-emergency trips were unblocked.
The reactor was in Mode 6 at the time of the event and not challenged throughout the event.
Decay heat removal and spent fuel pool cooling were not challenged throughout the event.
Because this event resulted in the automatic actuation of a system listed in 10 CFR 50.73(a)(2)(iv)(B), this event is reportable under 10 CFR 50.73(a)(2)(iv)(A). This event had no adverse effect on the health and safety of the public, and is of very low safety significance.
Unit 1 was unaffected. |
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Category:Letter
MONTHYEARML24032A0252024-02-0505 February 2024 NRC Initial Test Program and Operational Programs Integrated Inspection Report 05200026-2023009 ML24010A0712024-01-31031 January 2024 Exemption from Select Requirements of 10 CFR Part 73 (Security Notifications, Reports and Recordkeeping and Suspicious Activity Reporting) ML24031A6102024-01-31031 January 2024 Cyber Security Inspection Report 05200026/2024401 - Public ML24029A0592024-01-30030 January 2024 Request for Withholding Information from Public Disclosure Responses to NRC Request for Additional Information for Refueling Outage 1R24 Steam Generator Tube Inspection Report Enclosure 2, GAE-NRCD-RF-LR-000002 P-Attachment, Rev. 0 ML24016A1132024-01-30030 January 2024 Correction of Unit 1 Amendment Nos. 96 and 190 and Unit 2 Amendment Nos. 74 and 173 Adoption of Standard Technical Specifications Westinghouse Plants NL-24-0031, Inservice Inspection Program Owner'S Activity Report (OAR-1) for Outage 2R232024-01-29029 January 2024 Inservice Inspection Program Owner'S Activity Report (OAR-1) for Outage 2R23 IR 05000424/20244032024-01-26026 January 2024 Information Request for the Cyber-Security Baseline Inspection, Notification to Perform Inspection 05000424/2024403; 05000425/2024403 NL-24-0020, Plan, Unit 1 Responses to NRC Request for Additional Information for Refueling Outage 1R24 Steam Generator Tube Inspection Report2024-01-22022 January 2024 Plan, Unit 1 Responses to NRC Request for Additional Information for Refueling Outage 1R24 Steam Generator Tube Inspection Report ML23347A2092024-01-17017 January 2024 Voluntary Requests for Data, Information, And/Or Observation ML23279A0042024-01-17017 January 2024 Amendment No. 194 to Remove Combined License Appendix C NL-23-0926, Correction of Technical Specification Typographical Error2024-01-12012 January 2024 Correction of Technical Specification Typographical Error ML23341A2042024-01-12012 January 2024 Request for Additional Information Exemption Requests for Physical Barriers (EPID L-2023-LLE-0018 & L-2023-LLE-0021) ML23345A1312024-01-0303 January 2024 Withholding Letter - SNC Fleet - Physical Barriers Exemption (L-2023-LLE-0018 and L-2023-LLE-0021) ML23317A2072023-12-22022 December 2023 Issuance of Amendments 223 and 206 Regarding Revision to Technical Specifications to Adopt TSTF-339-A, Relocate Technical Specification Parameters to the COLR Consistent with WCAP-1448 ML23335A1222023-12-19019 December 2023 Safety Evaluation Regarding Implementation of Mitigating Strategies Related to Order EA-12-049 (EPID L-2023-LRQ-0002) - Letter ML23353A1702023-12-19019 December 2023 LAR-22-002, TS 3.8.3 Inverters Operating Completion Time Extension Letter ML23310A2922023-12-0707 December 2023 Issuance of Amendment for Exception to Regulatory Guide 1.163, LAR 23 007 ML23339A1812023-12-0707 December 2023 Correction Letter Regarding License Amendment Request: More Restrictive Action for Technical Specification 3.1.9 ML23338A2182023-12-0606 December 2023 Project Manager Reassignment NL-23-0878, Request for Exemption from Security Event Notification Implementation2023-11-29029 November 2023 Request for Exemption from Security Event Notification Implementation ML23289A1632023-11-28028 November 2023 Letter and Amendment 195 and 192 LAR-23-006R1 TS 3.1.9 More Restrictive Action NL-23-0827, Response to Requests for Additional Information for a License Amendment Request and a Proposed Alternative Related to TS 3.4.142023-11-17017 November 2023 Response to Requests for Additional Information for a License Amendment Request and a Proposed Alternative Related to TS 3.4.14 ML23318A4582023-11-14014 November 2023 Integrated Inspection Report 05200025/2023003 ML23312A3502023-11-14014 November 2023 Integrated Inspection Report 05200026/2023003 ML23306A3552023-11-0808 November 2023 NRC Initial Test Program and Operational Programs Integrated Inspection Report 052000/262023008 ML23268A0572023-11-0707 November 2023 Issuance of Amendments 194 & 191 Request for License Amendment Relocation of Technical Specification 3.7.9, Spent Fuel Pool Makeup Water Sources (LAR-23-003) IR 05000424/20234022023-11-0606 November 2023 Security Baseline Inspection Report 05000424/2023402 and 05000425/2023402 IR 05000424/20230032023-10-27027 October 2023 Integrated Inspection Report 05000424/2023003 and 05000425/2023003 ML23291A1512023-10-18018 October 2023 Information Request for the Cyber Security Baseline Inspection, Notification to Perform Inspection 0520026/2024401 ML23263A9852023-10-12012 October 2023 Issuance of Amendments Nos. 221 and 204, Regarding Technical Specification 5.5.11.C, Acceptance Criteria for Charcoal Filter Testing ML23283A0472023-10-0808 October 2023 Neop Letter Dated October 8, 2023 - Vogtle 3 & 4 - TS 3.7.6 License Amendment Request NL-23-0750, Response to Second Request for Additional Information Regarding License Amendment Request: Technical Specification Revision to Adopt TSTF-339-A, Relocate Technical Specification Parameters to the Colr2023-10-0404 October 2023 Response to Second Request for Additional Information Regarding License Amendment Request: Technical Specification Revision to Adopt TSTF-339-A, Relocate Technical Specification Parameters to the Colr NL-23-0745, Refueling Outage 1R24 Steam Generator Tube Inspection Report2023-09-22022 September 2023 Refueling Outage 1R24 Steam Generator Tube Inspection Report ML23254A2032023-09-13013 September 2023 Initial Test Program and Operational Programs Inspection Report 05200025/2023013 ML23241B0212023-09-12012 September 2023 Review of Quality Assurance Topical Report ML23234A2352023-09-0808 September 2023 Request for Withholding Information from Public Disclosure Notification of Full Compliance of Required Action for NRC Order EA-12-049 Mitigation Strategies for Beyond-Design-Basis External Events IR 05000424/20230912023-09-0505 September 2023 Plan Units 1 and 2 - NRC Investigation Report 2-2022-006 and Notice of Violation - NRC Inspection Report 05000424/2023091 and 05000425/2023091 ML23234A3002023-09-0101 September 2023 NRC Integrated Inspection Report 05200026/2023003 ML23243A0092023-08-31031 August 2023 Updated Inspection Plan for Vogtle Electric Generating Plant, Units 3 & 4 (Report 05200025 2023005 & 05200026 2023005) NL-23-0695, Response to Round 2 Request for Additional Information Regarding License Amendment Request for Technical Specification 3.8.3, Inverters Operating, Completion Time Extension (LAR-22-002S2)2023-08-31031 August 2023 Response to Round 2 Request for Additional Information Regarding License Amendment Request for Technical Specification 3.8.3, Inverters Operating, Completion Time Extension (LAR-22-002S2) ML23243B0252023-08-30030 August 2023 Exam Corporate Notification Letter (210 Day) IR 05000424/20230052023-08-29029 August 2023 Updated Inspection Plan for Vogtle Electric Generating Plant, Units 1 & 2 - Report 05000424/2023005 and 05000425/2023005 NL-23-0666, License Amendment Request: Remove Combined License Appendix C (LAR 23-008)2023-08-28028 August 2023 License Amendment Request: Remove Combined License Appendix C (LAR 23-008) 2024-02-05
[Table view] Category:Licensee Event Report (LER)
MONTHYEARND-23-0439, ITAAC Closure Notification on Completion of ITAAC 2.2.05.07a.i (Index Number 265)2023-07-18018 July 2023 ITAAC Closure Notification on Completion of ITAAC 2.2.05.07a.i (Index Number 265) 05000425/LER-2017-0022017-11-17017 November 2017 Valid Undervottage Condition results in Automatic Actuation of a Safety System, LER 17-002-00 for Vogtle, Unit 2, Regarding Valid Undervoltage Condition Results in Automatic Actuation of a Safety System 05000424/LER-2017-0022017-06-29029 June 2017 Vice President Vogtle Units 1-2 7821 River RD Waynesboro GA, 30830 706-848-0004 tel 706-848-3321 fax June 29, 2017 Docket No: 50-424 NL-17-1104 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Vogtle Electric Generating Plant — Unit 1 Licensee Event Report 2017-002-01 Wiring Error results in Automatic Actuation of a Safety System Ladies and Gentlemen: In accordance with the requirements of 10 CFR 50.73(a)(2)(iv)(A), Southern Nuclear Operating Company is submitting the enclosed Licensee Event Report, 2017-002-01 for Vogtle Electric Generating Plant Unit 1. This letter contains no NRC commitments. If you have any questions, please contact Dom Sutton at (706) 848-1428. Respectfully sub Darin J. M rs Vice President — Plant ogtle Units 1&2 - SNC DJM/KCW Enclosure: Unit 1 Licensee Event Report 2017-002-01 Cc: Regional Administrator NRR Project Manager — Vogtle 1 & 2 Senior Resident Inspector — Vogtle 1 & 2 RType: CVC7000 Vogtle Electric Generating Plant — Unit 1 Licensee Event Report 2017-002-01 Wiring Labeling Error results in Automatic Actuation of a Safety System Enclosure Unit 1 Licensee Event Report 2017-002-01 NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (04-2017) LICENSEE EVENT REPORT (LER) ILWa t l,viricir (See Page 2 for required number of digits/charactersfor each block) ••••••• (See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.qovireadincl-rmidoc-collections/nuregs/staff/sr1022/r3i) APPROVED BY OMB: NO. 3150-0104 EXPIRES: 0313112020 Estimated burden per response to comply with this mandatory collection request: 80 hours Reported lessons learned are incorporated into the licensing process and fed back to industry Send comments regarding burden estimate to the Information Services Branch (T-2 F43), US Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to Infocollects Resource@nrc gov, and to the Desk Officer, Office of Information •and Regulatory Affairs, 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. 1. FACILITY NAME Vogtle Electric Generating Plant . DOCKET NUMBER 13. PAGE 17.:15000424 1 1 OF 2 4. TITLE Mirina Error results in_AulomaticActuation_of a Safety System_, LER 17-002-01 for Vogtle, Unit 1, Wiring Error Results in Automatic Actuation of a Safety System 05000425/LER-2017-0012017-06-29029 June 2017 1 OF 3, LER 17-001-01 for Vogtle, Unit 2, Regarding Power Supply Failure Results in Operation in a Condition Prohibited by Technical Specifications Supplement NL-10-0577, LER 10-S01-00 for Vogtle, Units 1 & 2 Regarding Supplemental Worker'S Unescorted Access Not Revoked in a Timely Manner2010-03-30030 March 2010 LER 10-S01-00 for Vogtle, Units 1 & 2 Regarding Supplemental Worker'S Unescorted Access Not Revoked in a Timely Manner 2023-07-18
[Table view] |
A Event Description On September 26, 2017, during the performance of Engineered Safety Features Actuation System (ESFAS) testing, operators simulated an under voltage (UV) condition and Safety Injection (SI) signal in accordance with their procedure. The Emergency Diesel Generator (EDG) started and was carrying the safety related electrical bus as expected. As operations continued in the procedure, the UV condition was cleared once the diesel began carrying the electrical bus and the SI signal was manually reset per procedure from the control room. By design, the diesel generator will continue to run in emergency mode even after the UV or SI signals are cleared until the diesel is reset locally from the Loss of Site Power (LOSP)/SI signal.
When the operator reset the diesel locally, the engine control system sent a shutdown signal to the engine which caused the output breaker to open and deenergized the bus. Because the EDG was the only source carrying the emergency bus, this caused an undervoltage condition on the bus and the EDG received another emergency start signal.
The EDG, which had not coasted to a stop, but did indicate that the speed dropped below 440rpm, subsequently restarted, the output breaker closed, and the loads were sequenced back on to the bus.
The unit operated in Mode 6 at 0 percent power during this event.
Because this event resulted in the automatic actuation of a system listed in 10 CFR 50.73(a)(2)(iv)(B), this event is reportable under 10 CFR 50.73(a)(2)(iv)(A)
B. Cause of Event
The cause of the diesel trip and subsequent loss of the safety related bus was an air leak on the shutdown logic board within the pneumatic control system. This leak was large enough to degrade the air pressure such that when the emergency signal that was blocking non-emergency trips was removed, the diesel controls processed an engine shutdown signal and opened the output breaker.
C. Safety Assessment When the EDG started and loaded the bus. it was already performing it's specified safety function. As such, the safety significance of this event is very low.
D. Corrective Actions
The issue was corrected by replacing the leaking part on the logic board.
E. Previous Similar Events:
None
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05000425/LER-2017-001 | 1 OF 3 LER 17-001-01 for Vogtle, Unit 2, Regarding Power Supply Failure Results in Operation in a Condition Prohibited by Technical Specifications Supplement | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications | 05000425/LER-2017-002 | Valid Undervottage Condition results in Automatic Actuation of a Safety System LER 17-002-00 for Vogtle, Unit 2, Regarding Valid Undervoltage Condition Results in Automatic Actuation of a Safety System | 10 CFR 50.73(a)(2)(iv)(A), System Actuation | 05000424/LER-2017-002 | Vice President Vogtle Units 1-2 7821 River RD Waynesboro GA, 30830 706-848-0004 tel 706-848-3321 fax June 29, 2017 Docket No: 50-424 NL-17-1104 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Vogtle Electric Generating Plant — Unit 1 Licensee Event Report 2017-002-01 Wiring Error results in Automatic Actuation of a Safety System Ladies and Gentlemen: In accordance with the requirements of 10 CFR 50.73(a)(2)(iv)(A), Southern Nuclear Operating Company is submitting the enclosed Licensee Event Report, 2017-002-01 for Vogtle Electric Generating Plant Unit 1. This letter contains no NRC commitments. If you have any questions, please contact Dom Sutton at (706) 848-1428. Respectfully sub Darin J. M rs Vice President — Plant ogtle Units 1&2 - SNC DJM/KCW Enclosure: Unit 1 Licensee Event Report 2017-002-01 Cc: Regional Administrator NRR Project Manager — Vogtle 1 & 2 Senior Resident Inspector — Vogtle 1 & 2 RType: CVC7000 Vogtle Electric Generating Plant — Unit 1 Licensee Event Report 2017-002-01 Wiring Labeling Error results in Automatic Actuation of a Safety System Enclosure Unit 1 Licensee Event Report 2017-002-01 NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (04-2017) LICENSEE EVENT REPORT (LER) ILWa t l,viricir (See Page 2 for required number of digits/charactersfor each block) ••••••• (See NUREG-1022, R.3 for instruction and guidance for completing this form http://www.nrc.qovireadincl-rmidoc-collections/nuregs/staff/sr1022/r3i) APPROVED BY OMB: NO. 3150-0104 EXPIRES: 0313112020 Estimated burden per response to comply with this mandatory collection request: 80 hours Reported lessons learned are incorporated into the licensing process and fed back to industry Send comments regarding burden estimate to the Information Services Branch (T-2 F43), US Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to Infocollects Resource@nrc gov, and to the Desk Officer, Office of Information •and Regulatory Affairs, 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. 1. FACILITY NAME Vogtle Electric Generating Plant . DOCKET NUMBER 13. PAGE 17.:15000424 1 1 OF 2 4. TITLE Mirina Error results in_AulomaticActuation_of a Safety System_ LER 17-002-01 for Vogtle, Unit 1, Wiring Error Results in Automatic Actuation of a Safety System | 10 CFR 50.73(a)(2)(iv)(A), System Actuation |
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