06-02-2017 | At 2155 hours0.0249 days <br />0.599 hours <br />0.00356 weeks <br />8.199775e-4 months <br /> Eastern Daylight Time on 4/3/2017 with the plant in Mode 3 at zero percent power, H. B. Rob.nson Steam Electric Plant, Unit No. 2 (FIBRSEP2), experienced an actuation of the Auxiliary Feedwater ( AFW) System during turbine trip logic surveillance testing.
Subsequent investigation determined that the surveillance test was performed without verifying AFW actuation signals were defeated, as required by the test procedure. During performance of the test the AFW system actuated when the only running main feedwater (MFW) pump was tripped as part of the test. Since the AFW defeat switches were not in the defeat position, the AFW system actuated as designed in response to the tripped MFW pump. Main feedwater was restored and the AFW pumps were secured.
The direct cause of the AFW system actuation was inadequate procedure adherence during turbine trip surveillance testing. |
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Category:Letter
MONTHYEARIR 05000261/20230042024-01-31031 January 2024 Integrated Inspection Report 05000261/2023004 ML24009A2432024-01-25025 January 2024 Unit, No. 2 - Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0047 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) ML24009A2712024-01-24024 January 2024 Revision to Reactor Vessel Material Surveillance Capsule Withdrawal Schedule ML23354A0052024-01-0808 January 2024 Request for Withholding Information from Public Disclosure, H. B. Robinson Steam Electric Plant, Unit No. 2 ML23342A0902023-12-0808 December 2023 Notification of Inspection and Request for Information for NRC Problem Identification and Resolution Inspection IR 05000261/20234202023-11-30030 November 2023 Security Baseline Inspection Report 05000261/2023420 (Cover Letter with Report) IR 05000261/20230102023-11-28028 November 2023 Fire Protection Team Inspection Report 05000261/2023010 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 05000261/20230032023-11-0707 November 2023 Integrated Inspection Report 05000261 2023003 and 07200060 2023001 ML23226A0862023-10-12012 October 2023 Issuance of Amendment No. 277 Regarding Revision of TSs to Add High-High Steam Generator Level Function to Table 3.3.2-1 and Remove Obsolete Content from TSs 2.1.1.1 and 5.6.5.b 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 ML23235A0552023-08-23023 August 2023 Notification of an Fire Protection Team Inspection (FPTI) (NRC Inspection Report 05000261/2023010) and Request for Information (RFI) IR 05000261/20230052023-08-21021 August 2023 Updated Inspection Plan for H.B. Robinson Steam Electric Plant (Report 05000261/2023005) IR 05000261/20230022023-08-0707 August 2023 Integrated Inspection Report 05000261/2023002 IR 05000261/20234022023-05-30030 May 2023 Cyber Security Inspection Report 05000261/2023402 ML23145A1602023-05-25025 May 2023 Submittal of Updated Final Safety Analysis Report (Revision No. 30), Independent Spent Fuel Storage Installation Safety Analysis Report (Revision No. 28), Technical Specifications Bases Revisions, Quality IR 05000261/20230012023-05-0202 May 2023 Integrated Inspection Report 05000261/2023001 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 ML22332A4932023-03-10010 March 2023 William States Lee III 1 and 2 - Issuance of Amendments Regarding the Relocation of the Emergency Operations Facility IR 05000261/20220062023-03-0101 March 2023 Annual Assessment Letter for H.B. Robinson Steam Electric Plant, Unit 2 (Report 05000261/2022006) ML23047A4512023-02-21021 February 2023 Information Request for the Cyber-Security Baseline Inspection, Notification to Perform Inspection 05000261/2023402 ML23041A2272023-02-13013 February 2023 2022 Q4 Robinson_Workflow Final ML22329A2982023-01-19019 January 2023 Issuance of Amendment No. 274 Regarding Revision of Technical Specification 3.8.1 Surveillance Requirement 3.8.1.16 ML22294A0922022-12-15015 December 2022 Issuance of Amendment No. 273 Regarding Adoption of TSTF-577, Revised Frequencies for Steam Generator Tube Inspections, Revision 1 ML22339A1362022-12-0101 December 2022 2023 Requalification Program Inspection - H.B. Robinson Nuclear Plant 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 ML22322A1322022-11-18018 November 2022 301, NRC Operator License Examination Report & Cover Letter Merged ML22256A2532022-11-14014 November 2022 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-541, Rev. 2 IR 05000261/20220032022-11-0303 November 2022 Integrated Inspection Report 05000261 2022003 IR 05000261/20224022022-10-19019 October 2022 Security Baseline Inspection Report 05000261/2022402 IR 05000261/20220102022-09-26026 September 2022 Design Basis Assurance Inspection (Teams) Inspection Report 05000261/2022010 IR 05000261/20223012022-09-23023 September 2022 301 Operator License Exam Approval Letter (05000261/2022301) ML22258A0302022-09-15015 September 2022 Evacuation Time Estimate Reports IR 05000261/20220052022-08-26026 August 2022 Updated Inspection Plan for the H.B Robinson Steam Electric Plant - Report 05000261/2022005-Final IR 05000261/20214042022-08-10010 August 2022 Reissue - H.B. Robinson Steam Electric Plant Security Baseline Inspection Report 05000261/2021404 IR 05000261/20220022022-08-0909 August 2022 Integrated Inspection Report 05000261 2022002, 07200060 2022001 and Exercise of Enforcement Discretion ML22213A0682022-08-0505 August 2022 Request for Withholding Information from Public Disclosure for H. B. Robinson Steam Electric Plant, Unit 2 ML22193A2122022-08-0404 August 2022 Request of Alternatives to ASME Code Section XI Subsection IWE Requirements for Containment Inspections ML22159A2952022-08-0303 August 2022 Issuance of Amendment No. 271 Regarding Correction to Non-Conservative Technical Specifications Figure 3.4.3-2, Pressure/Temperature Limit Cooldown Curves IR 05000261/20220112022-07-19019 July 2022 Biennial Problem Identification and Resolution Inspection Report 05000261/2022011 ML22167A1702022-07-14014 July 2022 Closeout of Generic Letter 2004 02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors ML22046A0222022-06-14014 June 2022 Issuance of Amendments to Adopt TSTF-439, Eliminate Second Completion Times Limiting Time from Discovery of Failure to Meet an LCO ML22125A1942022-05-12012 May 2022 Request for Withholding Information from Public Disclosure for H.B. Robinson Steam Electric Plant, Unit 2 IR 05000261/20220012022-05-0202 May 2022 Integrated Inspection Report 05000261/2022001 IR 05000261/20224012022-04-19019 April 2022 Security Baseline Inspection Report 05000261/2022401 ML22098A2262022-04-11011 April 2022 Notification of Inspection and Request for Information for NRC Problem Identification and Resolution Inspection ML22083A0032022-03-29029 March 2022 Closeout of Bulletin 2012 01, Design Vulnerability in Electric Power System IR 05000261/20210062022-03-0202 March 2022 Annual Assessment Letter for H.B. Robinson Steam Electric Plant Unit 2 (Report No. 05000261/2021006) 2024-01-08
[Table view] Category:Licensee Event Report (LER)
MONTHYEARRA-19-0384, LER 20190-001-00 for H.B. Robinson Steam Electric Plant, Unit 2, Turbine Trip/Reactor Trip Due to Main Generator Lockout2019-10-0909 October 2019 LER 20190-001-00 for H.B. Robinson Steam Electric Plant, Unit 2, Turbine Trip/Reactor Trip Due to Main Generator Lockout 05000261/LER-2017-0022017-12-14014 December 2017 Plant Vital Area Security Vulnerability Discovered Without Compensatory Security Measures, LER 17-002-00 for H.B. Robinson, Unit 2, Regarding Plant Vital Area Security Vulnerability Discovered Without Compensatory Security Measures 05000261/LER-2017-0012017-06-0101 June 2017 Auxiliary Feedwater System Actuation During Surveillance Testing, LER 17-001-00 for H.B. Robinson, Unit 2, Regarding Auxiliary Feedwater System Actuation During Surveillance Testing 05000261/LER-2016-0052017-02-22022 February 2017 Reactor Trip and Automatic System Actuation Due to Weather-Related Grid Disturbance, LER 16-005-01 for H. B. Robinson Steam Electric Plant, Unit 2 Regarding Reactor Trip and Automatic System Actuation Due to Weather-Related Grid Disturbance 05000261/LER-2016-0022016-06-13013 June 2016 Unanalyzed Condition Related to Main Steam Line Break Inside Containment, LER 16-002-00 for H.B. Robinson Steam Electric Plant, unit No. 2, Regarding Unanalyzed Condition Related to Main Steam Line Break Inside Containment 05000261/LER-2016-0012016-03-21021 March 2016 Inoperability of Motor-Driven Auxiliary Feedwater Pumps Due to Insufficient Lube Oil Cooling, LER 16-001-00 for H.B. Robinson, Unit 2, Regarding Inoperability of Motor-Driven Auxiliary Feedwater Pumps Due to Insufficient Lube Oil Cooling RNP-RA/11-0057, LER 011-001-00 for H. B. Robinson, Unit 2, Regarding Condition Prohibited by Technical Specifications When Non-Seismic System Was Aligned to Refueling Water Storage Tank Due to Regulatory Requirements Not Adequately Incorporated in Pl2011-06-30030 June 2011 LER 011-001-00 for H. B. Robinson, Unit 2, Regarding Condition Prohibited by Technical Specifications When Non-Seismic System Was Aligned to Refueling Water Storage Tank Due to Regulatory Requirements Not Adequately Incorporated in Plant Do 2019-10-09
[Table view] |
comments regarding burden estimate to the Information Services Branch (T-2 F43), 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 reqtrred to respond to, the information collection H. B. Robinson Steam Electric Plant, Unit No. 2 2017 00
BACKGROUND
The Auxiliary Feedwater (AFW) System[BA] can provide feedwater to the steam generators[SG] for decay heat removal if main feedwater is not available or steam generator level is not adequate. The system provides feedwater from any one or combination of three AFW pumps[P], two are motor-driven pumps and the third is steam driven. The two motor-driven pumps are supplied power from the emergency buses[BU] E-1 and E-2. The steam-driven pump can be operated independent of electrical power where steam produced from decay heat drives the turbine[TRB].
10 CFR 50.72 and 10 CFR 50.73 requires events to be reported in which one of the specified systems actuates either manually or automatically. This requirement is based on the premise that these systems are provided to mitigate the consequences of a significant event and, therefore: (1) they should work properly when called upon, and (2) they should not be challenged frequently or unnecessarily.
The event described below is reportable under 10 CFR 50.72(b)(3)(iv)(A), any event or condition that results in valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B) of this section except when the actuation results from and is part of a pre-planned sequence during testing or reactor[RCT] operation. Consequently, an 8-hour notification was made on 4/3/2017 to the Nuclear Regulatory Commission (NRC) Operations Center (EN No. 52662). The event is also reportable under 10 CFR 50.73(a)(2)(iv)(A), any event or condition that resulted in manual or automatic actuation of any of the systems listed in paragraph (a)(2)(iv)(B) of this section, except when: (1) the actuation resulted from and was part of a pre-planned sequence during testing of reactor operation; or (2) the actuation was invalid and; (i) occurred while the system was properly removed from service; or (ii) occurred after the safety function had been already completed. This criterion requires a 60-day licensee event report be submitted within 60-days of the event date.
EVENT DESCRIPTION
On 4/3/2017 H. B. Robinson Steam Electric Plant, Unit No. 2 (HBRSEP2) was in Mode 3 at zero percent power with the 'B' MFW pump in service. Turbine trip logic surveillance testing was in progress per Maintenance Surveillance Test (MST)-551, Turbine Trip Logic Channel Testing. During performance of the test the AFW system actuated when the only running main feedwater (MFVV) pump was tripped as part of the test. The following sequence of events provides a concise chronological description of the operation of plant equipment surrounding the safety system actuation.
Date: Time: Event:
4/3/2017: 1952 -'A' and 'B' Reactor Trip Breakers[BKR] closed for MST-551, Turbine Trip Logic Channel Testing.
2155 - MFW pump 'B' tripped as a result of MST-551 section 7.6 performance causing an AFW system actuation. 'A' and 'B' motor-driven AFW pumps started as required.
2201 - 'B' AFW pump was secured in accordance with OP-402, Auxiliary Feedwater System.
2237 - 'B' MFW pump was started in accordance with OP-403, Feedwater System.
2242 - 'A' AFW pump was secured in accordance with OP-402.
CAUSAL FACTORS
The guidance (Step 7.6.1) in MST-551, Turbine Trip Logic Channel Testing, directed the balance of plant (BOP) licensed operator to ensure that the AFW defeat switches[33] for 'A' and 'B' trains were in the DEFEAT position. The BOP licensed operator documented completion of Step 7.6.1 without looking at the switch positions as required by the MST procedure. This inadequate procedure adherence is the direct cause of the event.
001 comments regarding burden estimate to the Information Services Branch (T-2 F43), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by e-mail to Infocollects.Resource@nrcgov, and to the Desk Officer, Office of Information and Regulatory Affairs 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 s not requred to respond to, the information collection H. B. Robinson Steam Electric Plant, Unit 05000- 261 001 00 No. 2 2017 - -
CORRECTIVE ACTIONS
Completed:
1. MST-551 was suspended.
2. 'B' MFW pump was restarted.
3. AFW pumps were secured.
4. BOP operator was relieved of his licensed operator duties and submitted to post-event testing.
5. The BOP operator received a formal remedial training package on procedure adherence.
SAFETY ANALYSIS
The actuation of the AFW system during surveillance testing was valid, and the system responded to plant conditions as designed. There is no safety consequence as a result of this event. The cause was attributed to inadequate procedure adherence and not due to any equipment failures. This event resulted in no impact to the health and safety of the public
ADDITIONAL INFORMATION
An operating experience (OE) search was conducted and there is one prior event at HBRSEP2 involving inadvertent actuation of the AFW system within the past three years. This actuation was due to inadequate procedural guidance rather than inadequate procedure adherence, and was reported via LER 2016-005-01.
Energy Industry Identification System (EIIS) codes for systems and components relevant to this event are identified in the text of this document within brackets [ ].