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Category:Letter
MONTHYEARIR 05000461/20230042024-02-0202 February 2024 Integrated Inspection Report 05000461/2023004 ML23361A1572024-01-24024 January 2024 Audit Plan in Support of Review of License Amendment Request Regarding Revision of Technical Specifications Related to Reactor Water Cleanup Isolation ML24004A0792024-01-18018 January 2024 Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0041 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) IR 05000461/20234022023-12-27027 December 2023 Security Baseline Inspection Report 05000461/2023402 ML23305A1402023-12-13013 December 2023 Units 1 & 2; Nine Mile Point, Unit 2; Peach Bottom, Units 2 & 3; and Quad Cities, Units 1 and 2 - Issuance of Amendments to Adopt Traveler TSTF-580 IR 05000461/20235012023-12-0505 December 2023 Emergency Preparedness Biennial Exercise Inspection Report 05000461/2023501 ML23284A2512023-11-22022 November 2023 Amendment No. 250 to Adopt TSTF-332 ML23317A1192023-11-10010 November 2023 Constellation Energy Generation, LLC - 2023 Annual Report - Guarantees of Payment of Deferred Premiums IR 05000461/20230032023-11-0808 November 2023 Integrated Inspection Report 05000461/2023003 ML22300A2212023-11-0202 November 2023 Preliminary Decommissioning Cost Estimate and Fuel Management Plan RS-23-097, Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans2023-10-12012 October 2023 Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans IR 05000461/20233012023-09-12012 September 2023 NRC Initial License Examination Report 05000461/2023301 RS-23-090, Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Clinton Power Station2023-09-0707 September 2023 Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Clinton Power Station RS-23-080, Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - Delete Flux Monitors Specific Overlap Requirement SRs2023-08-30030 August 2023 Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - Delete Flux Monitors Specific Overlap Requirement SRs IR 05000461/20234202023-08-29029 August 2023 Security Baseline Inspection Report 05000461/2023420 RS-23-081, Request for License Amendment to Revise Technical Specifications Related to Reactor Water Cleanup Isolation Instrumentation2023-08-21021 August 2023 Request for License Amendment to Revise Technical Specifications Related to Reactor Water Cleanup Isolation Instrumentation IR 05000461/20230022023-08-0404 August 2023 Integrated Inspection Report 05000461/2023002 RS-23-085, Supplemental Information Related to Request for Partial Site Release2023-08-0303 August 2023 Supplemental Information Related to Request for Partial Site Release ML23209A8102023-07-28028 July 2023 05000461; Notification of an NRC Biennial Licensed Operator Requalification Program Inspection and Request for Information ML23198A0152023-07-27027 July 2023 License Renewal Application Public Meeting Summary of Pre-Submittal Meeting ML23202A0992023-07-24024 July 2023 Notification of NRC Baseline Inspection and Request for Information; Inspection Report 05000461/2023004 ML23200A2592023-07-24024 July 2023 June 27, 2023, Clinton Power Station License Renewal Environmental Pre-application Public Meeting-Meeting Summary IR 05000461/20234012023-07-19019 July 2023 Cyber Security Inspection Report 05000461/2023401 ML23194A1662023-07-19019 July 2023 Supplemental Information Needed for Acceptance of Requested Licensing Action Request for Partial Site Release ML23191A8772023-07-11011 July 2023 Operator Licensing Examination Approval Clinton Power Station July 2023 ML23178A2422023-06-28028 June 2023 Reassignment of the U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch III RS-23-077, Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations2023-06-16016 June 2023 Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations RS-23-073, Request for Partial Site Release2023-06-0707 June 2023 Request for Partial Site Release IR 05000461/20230102023-05-26026 May 2023 Triennial Fire Protection Inspection Report 05000461/2023010 RS-23-042, Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling2023-05-25025 May 2023 Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling ML23143A3182023-05-23023 May 2023 Information Meeting (Open House) with a Question and Answer Session to Discuss NRC 2022 End-Of-Cycle Plant Performance Assessment of Clinton Power Station, Unit 1 IR 05000461/20230012023-05-0404 May 2023 Integrated Inspection Report 05000461/2023001 ML23118A3472023-05-0101 May 2023 County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Correction of Amendment No. 193 Adoption of TSTF-306, Revision 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration EPID L-2022-LLA-0143 ML23114A2522023-04-28028 April 2023 Request to Use a Provision of a Later Edition of the ASME Boiler & Pressure Vessel Code, Section XI ML23081A0382023-04-25025 April 2023 County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Issuance of Amendments to Adopt TSTF-306, Rev. 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration ML23110A3202023-04-21021 April 2023 Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection RS-23-049, Constellation Energy Generation, LLC, Report on Status of Decommissioning Funding for Reactors and Independent Spent Fuel Storage Installations2023-03-23023 March 2023 Constellation Energy Generation, LLC, Report on Status of Decommissioning Funding for Reactors and Independent Spent Fuel Storage Installations ML23061A1632023-03-0303 March 2023 Reassignment of the U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch 3 IR 05000461/20220062023-03-0101 March 2023 Annual Assessment Letter for Clinton Power Station, Unit 1 (Report 05000461/2022006) RS-23-039, Request for License Amendment to Revise Technical Specifications Section 3.8.3, Diesel Fuel Oil, Lube Oil, and Starting Air2023-03-0101 March 2023 Request for License Amendment to Revise Technical Specifications Section 3.8.3, Diesel Fuel Oil, Lube Oil, and Starting Air ML23031A2972023-03-0101 March 2023 Issuance of Amendment No. 248 Adoption of TSTF-269, Revision 2 RS-23-045, Constellation Energy Generation, LLC Submittal of Fitness for Duty Performance Data Reports for 2022 Per 10 CFR 26.717(c) & 10 CFR 26.2032023-02-28028 February 2023 Constellation Energy Generation, LLC Submittal of Fitness for Duty Performance Data Reports for 2022 Per 10 CFR 26.717(c) & 10 CFR 26.203 ML23039A1852023-02-10010 February 2023 Integrated Inspection Report 05000461/2022004 07201046/2022001 RS-23-003, Constellation Energy Generation, LLC, Summary of Changes to Quality Assurance Topical Report, NO-AA-10, and Decommissioning Quality Assurance Program, NO-DC-102023-01-31031 January 2023 Constellation Energy Generation, LLC, Summary of Changes to Quality Assurance Topical Report, NO-AA-10, and Decommissioning Quality Assurance Program, NO-DC-10 IR 05000461/20220112023-01-27027 January 2023 Biennial Problem Identification and Resolution Inspection Report 05000461/2022011 RS-23-002, Application to Adopt TSTF-332, ECCS Response Time Testing2023-01-13013 January 2023 Application to Adopt TSTF-332, ECCS Response Time Testing ML23005A0682023-01-0505 January 2023 Notification of NRC Fire Protection Team Inspection Request for Information: Inspection Report 05000461/2023010 ML22341A6042022-12-0808 December 2022 Confirmation of Initial License Examination IR 05000461/20224022022-12-0606 December 2022 Security Baseline Inspection Report 05000461/2022402 RS-22-126, Constellation Energy Generation, LLC - Request to Use Provisions of a Later Edition of the ASME Boiler and Pressure Vessel Code, Section XI2022-11-30030 November 2022 Constellation Energy Generation, LLC - Request to Use Provisions of a Later Edition of the ASME Boiler and Pressure Vessel Code, Section XI 2024-02-02
[Table view] Category:Licensee Event Report (LER)
MONTHYEAR05000461/LER-2017-0102018-02-0505 February 2018 Division 1 Transformer Failure Leads to Instrument Air Isolation to Containment Requiring a Manual Reactor Scram, LER 17-010-00 for Clinton Power Station, Unit 1 Regarding Division 1 Transformer Failure Leads to Instrument Air Isolation to Containment Requiring a Manual Reactor Scram 05000461/LER-2017-0092018-01-0404 January 2018 Trip of Emergency Reserve Auxiliary Transformer Static VAR Compensator Causes Positive Secondary Containment Pressure Following Voltage Transient on 138 kV Offsite Source., LER 17-009-00 for Clinton, Unit 1, Regarding Trip of Emergency Reserve Auxiliary Transformer Static VAR Compensator Causes Positive Secondary Containment Pressure Following Voltage Transient on 138 kV Offsite Source 05000461/LER-2017-0052017-09-28028 September 2017 Automatic Reactor Scram During the Performance of Scram Time Testing As a Result of an Invalid Oscillation Power Range Monitor Growth Rate Trip, LER 17-005-01 for Clinton, Unit 1 Regarding Automatic Reactor Scram During the Performance of Scram Time Testing As a Result of an Invalid Oscillation Power Range Monitor Growth Rate Trip 05000461/LER-2017-0082017-08-11011 August 2017 Division 3 Shutdown Service Water Pump Start Failure, LER 17-008-00 for Clinton, Unit 1 re Division 3 Shutdown Service Water Pump Start Failure 05000461/LER-2017-0072017-08-0909 August 2017 Manual Reactor SCRAM due to Loss of Feedwater Heating, LER 17-007-00 for Clinton, Unit 1 re Manual Reactor SCRAM due to Loss of Feedwater Heating 05000461/LER-2017-0062017-08-0101 August 2017 1 OF 3, LER 17-006-00 for Clinton, Unit 1 re Secondary Containment Inoperable During Mode Change Due to Doors Propped Open 05000461/LER-2017-0042017-07-10010 July 2017 Main Steam Isolation Valve Local Leak Rate Test Limit Exceeded During Refueling Outage, LER 17-004-00 For Clinton Power Station, Unit 1 Re: Main Steam Isolation Valve Local Leak Rate Test Limit Exceeded During Refueling Outage 05000461/LER-2017-0022017-07-0505 July 2017 Failure of the Division 1 Diesel Generator Ventilation Fan Load Sequence Relay Circuit During Concurrent Maintenance of RHR Division 2 Results in an Unanalyzed Condition, LER 17-002-01 for Clinton, Unit 1, Regarding Failure of the Division 1 Diesel Generator Ventilation Fan Load Sequence Relay Circuit During Concurrent Maintenance of RHR Division 2 Results in an Unanalyzed Condition U-604357, Special Report: Inoperable Drywall High Range Gamma Radiation Monitor2017-07-0505 July 2017 Special Report: Inoperable Drywall High Range Gamma Radiation Monitor 05000461/LER-2017-0032017-07-0303 July 2017 Implementation of Enforcement Guidance Memorandum (EGM) 11 - 003, Revision 3, LER 17-003-00 for Clinton Power Station, Unit 1 Regarding Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3 05000461/LER-2017-0012017-04-21021 April 2017 Failure of the 138 kV Offsite Power Source Results in a Loss of Secondary Containment Vacuum, LER 17-001-00 for Clinton, Unit 1, Regarding Failure of the 138 kV Offsite Power Source Results in a Loss of Secondary Containment Vacuum 05000461/LER-2016-0102017-03-0606 March 2017 1 OF 3, LER 16-010-01 for Clinton Power Station, Unit 1 RE: Failure to Complete Technical Specification Required Actions within the Completion Time Resulted in a Condition Prohibited by Technical Specifications 05000461/LER-2016-0092016-08-22022 August 2016 Trip of Fuel Building Fans Due to Damper Failure Results in Loss of Secondary Containment, LER 16-009-00 for Clinton Power Station, Unit 1 Regarding Trip of Fuel Building Fans Due to Damper Failure Results in Loss of Secondary Containment 05000461/LER-2016-0072016-07-15015 July 2016 Main Steam Line Flexible Hose Intergranular Stress Corrosion Cracking Identified During Refueling Outage, LER 16-007-00 for Clinton Power Station, Unit 1, Regarding Main Steam Line Flexible Hose lntergranular Stress Corrosion Cracking Identified During Refueling Outage 05000461/LER-2016-0082016-07-15015 July 2016 Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3, LER 16-008-00 for Clinton Power Station, Unit 1, Regarding Implementation of Enforcement Guidance Memorandum (EGM) 11-003, Revision 3 05000461/LER-2016-0062016-06-10010 June 2016 Missed Surveillance Results in a Condition Prohibited by Technical Specifications, LER 16-006-00 for Clinton Power Station Unit 1 RE: Missed Surveillance Results in a Condition Prohibited by Technical Specifications 05000461/LER-2016-0052016-05-31031 May 2016 Insulator Failure On the Reserve Auxiliary Transformer Results In A Loss of Secondary Containment Vacuum, LER 16-005-00 for Clinton Power Station, Unit 1, Regarding Insulator Failure on the Reserve Auxiliary Transformer Results in a Loss of Secondary Containment Vacuum 05000461/LER-2016-0042016-05-26026 May 2016 Trip of Emergency Reserve Auxiliary Transformer Static VAR Compensator Causes Positive Secondary Containment Pressure Following Lightning Strike on 138 kV Offsite Source, LER 16-004-00 for Clinton, Unit 1, Regarding Trip of Emergency Reserve Auxiliary Transformer Static VAR Compensator Causes Positive Secondary Containment Pressure Following Lightning Strike on 138 kV Offsite Source 05000461/LER-2016-0032016-05-23023 May 2016 Bypassing Both Divisions of Reactor Water Cleanup Leak Detection System is a Reportable Loss of Safety Function, LER 16-003-00 for Clinton Power Station, Unit 1 Regarding Bypassing Both Divisions of Reactor Water Cleanup Leak Detection System is a Reportable Loss of Safety Function 05000461/LER-2016-0022016-04-13013 April 2016 Trip of Fuel Building Ventilation Exhaust Fan Due to Moisture Formation Resulting In the Loss of Secondary Containment Vacuum, LER 16-002-00 for Clinton, Unit 1, Regarding Trip of Fuel Building Ventilation Exhaust Fan Due to Moisture Formation Resulting In the Loss of Secondary Containment Vacuum 2018-02-05
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'- ,EExelon Generation, Clinton Power Station8401 Power RoadClinton, IL 61727U-604140October 11, -201310 CFR 50.73SRRS 5A.108U. S. Nuclear Regulatory Commission ATTN: Document Control DeskWashington, D. C. 20555-0001 Clinton Power Station, Unit 1Facility Operating License No. NPF-62NRC Docket No. 50-461
Subject:
Licensee Event Report 2013-004-00 Enclosed is Licensee Event Report (LER) No. 2013-004-00:
Loss of Emergency DieselRoom Ventilation Due to Damper Hydramotor Failure.
This report is being submitted inaccordance with the requirements of 10 CFR 50.73.There are no regulatory commitments contained in this report.Should you have any questions concerning this report, please contact Ms. Kathy Ann Baker,Regulatory Assurance
- Manager, at (217)-937-2800.
Respectfully, B. Keith TaberSite Vice President Clinton Power StationRSF/blf
Enclosure:
Licensee Event Report 2013-004-00 cc: Regional Administrator
-NRC Region IIINRC Senior Resident Inspector
-Clinton Power StationOffice of Nuclear Facility Safety -IEMA Division of Nuclear Safety NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES:
10/31/2013 (10-2010)
Estimated burden per response to comply with this mandatory collection request:
80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />. Reported lessons learned are incorporated into thelicensing process and fed back to industry.
Send comments regarding burdenestimate to the FOIA/Privacy Section (T-5 F53), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by intemet e-mail toinfocollects.resource@nrc.gov, and to the Desk Officer, Office of Information LICENSEE EVENT REPORT (LER) and Regulatory
- Affairs, NEOB-10202, (3150-0104),
Office of Management andBudget, Washington, DC 20503. If a means used to impose an information (See reverse for required number of collection does not display a currently valid OMB control number, the NRC maysfor each block) not conduct or sponsor, and a person is not required to respond to, thedigits/characters finformation collection.
- 1. FACILITY NAME 2. DOCKET NUMBER 3. PAGEClinton Power Station, Unit 1 05000461 1 OF 44. TITLELoss of Emergency Diesel Room Ventilation Due to Damper Hydramotor Failure5. EVENT DATE 6. LER NUMBER 7. REPORT DATE 8. OTHER FACILITIES INVOLVEDT FACILITY NAME DOCKET NUMBERMONTH DAY Y YEAR SEQUENTIAL REV MONTH DAY YEAR 05000FACILITY NAME DOCKET NUMBER08 15 2013 2013 004 -00 10 11 2013 050009. OPERATING MODE 11. THIS REPORT IS SUBMI'rrED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)[1 20.2201(b)
[l 20.2203(a)(3)(i)
El 50.73(a)(2)(i)(C)
[I 50.73(a)(2)(vii) 10 20.2201(d)
El 20.2203(a)(3)(ii)
El 50.73(a)(2)(ii)(A)
El 50.73(a)(2)(viii)(A)
El 20.2203(a)(1)
El 20.2203(a)(4)
[I 50.73(a)(2)(ii)(B)
[E 50.73(a)(2)(viii)(B)
[] 20.2203(a)(2)(i)
El 50.36(c)(1)(i)(A)
[I 50.73(a)(2)(iii)
[I 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL 0 20.2203(a)(2)(ii) 0l 50.36(c)(1)(ii)(A)
[I 50.73(a)(2)(iv)(A)
El 50.73(a)(2)(x)
El 20.2203(a)(2)(iii)
El 50.36(c)(2)
[I 50,73(a)(2)(v)(A)
El 73.71(a)(4) 092 El 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii)
El 50.73(a)(2)(v)(B)
El 73.71(a)(5)
El 20.2203(a)(2)(v)
El 50.73(a)(2)(i)(A)
El 50.73(a)(2)(v)(C)
[E OTHEREl 20.2203(a)(2)(vi) 0l 50.73(a)(2)(i)(B)
ED 50.73(a)(2)(v)(D)
Specify in Abstract belowor in NRC Form 366A12. LICENSEE CONTACT FOR THIS LERFACILITY NAME TELEPHONE NUMBER (IncudeArea Code)Kathy Ann Baker, Regulatory Assurance Manager 217-937-2800
- 13. COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORTMANU- REPORTABLE MANU- REPORTABLE CAUSE SYSTEM COMPONENT FACTURER TOEPIX CAUSE SYSTEM COMPONENT X Vd HOVA 1106 Y14. SUPPLEMENTAL REPORT EXPECTED
- 15. EXPECTED MONTH DAY YEARSUBMISSION El YES (If yes, complete
- 15. EXPECTED SUBMISSION DATE) 0 NO DATEABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)On 8/15/13, maintenance personnel were performing planned performance testing of the Division 3Emergency Diesel Generator (EDG) Room Ventilation System and noticed the supply air damper did notopen when the EDG room ventilation fan started, and noticed the flow data results were not consistent withprevious testing data. The damper is required to stroke to full open and then modulate with the fan running ifsupply air temperature is above 70 degrees.
Operators restarted the fan with the temperature controller setat 70 degrees and actual air temperature reading 84 degrees, but the damper again failed to open.Operators immediately declared the Division 3 EDG and the supported High Pressure Core Spray Systeminoperable based on low confidence that the ventilation system was capable of controlling EDG roomtemperature to support the EDG mission time and entered the required Technical Specification actions.Troubleshooting found that the internal hydraulic pump in the damper's hydramotor had failed. The cause ofthis event is that the damper hydramotor experienced an end-of-life failure due to being installed beyond itsrecommended service life. Corrective actions include replacing the hydramotor that failed and identifying theextent of hydramotors installed beyond the recommended life and replacing them.NRC FORM 366 (10-2010)
NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION (10-2010)
LICENSEE EVENT REPORT (LER)CONTINUATION SHEET1. FACILITY NAME 2. DOCKET 6. LER NUMBER 3. PAGEY SEQUENTIAL REVIYEAR NUMBER NO.Clinton Power Station, Unit 1 05000461 J 2 OF 42013 004 -00NARRATIVE PLANT AND SYSTEM IDENTIFICATION General Electric
-- Boiling Water Reactor, 3473 Megawatts Thermal Rated Core PowerEnergy Industry Identification System (EIIS) codes are identified in test as [XX].EVENT IDENTIFICATION Loss of Emergency Diesel Room Ventilation Due to Damper Hydramotor FailureA. Plant Operating Conditions Before the EventUnit: 1 Event Date: 8/15/13 Event Time: 0915 hours0.0106 days <br />0.254 hours <br />0.00151 weeks <br />3.481575e-4 months <br /> CDTMode: 1 Mode Name: Power Operation Reactor Power: 92 percentB. DESCRIPTION OF EVENTOn 8/15/13, component maintenance personnel were performing planned performance testing of the Division3 Emergency Diesel Generator (EDG) [EK] Room Ventilation System [VJ]. At 0850 hours0.00984 days <br />0.236 hours <br />0.00141 weeks <br />3.23425e-4 months <br /> Operations placedthe Division 3 EDG ventilation fan into service.
At about 0915 hours0.0106 days <br />0.254 hours <br />0.00151 weeks <br />3.481575e-4 months <br />, the component maintenance personnel noticed the supply air damper [DMP] did not demonstrate the expected behavior of opening when the Division3 EDG room ventilation fan [FAN] started, and noticed the flow data results were not consistent with previoustesting data.Operators suspected that the cause of the damper not opening was that outside air temperature was belowthe damper setpoint of 70 degrees Fahrenheit (F), determined that the test should be run again later in theday when intake air temperature would be higher, and initiated Issue Report 1546973 to document theirconclusion.
At about 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />, operators restarted the fan with the temperature controller set at 70degrees F and actual air temperature reading 84 degrees F, but the damper again failed to open. At about1420 hours, operators secured the fan and declared the Division 3 EDG and the supported High PressureCore Spray System [BG] inoperable based on low confidence that the VJ system was capable of controlling EDG room temperature to support the EDG mission time, and entered the required Technical Specification actions.The Clinton Power Station Updated Safety Analysis Report sections 9.4.5.1.1.2.b and d state that the EDGventilation system is designed to limit the maximum EDG room temperature to 130 degrees F. Duringextreme weather conditions EDG room temperatures may rise to 140 degrees F maximum for 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.The supply air damper/hydramotor
[HOVA] assembly is designed to fail closed. The damper control isdesigned to fully open and then modulate the damper to maintain supply air temperature at a setpoint of 70degrees F on fan start if supply air temperature is greater than 70 degrees F. During troubleshooting thedamper did not open when temperature reached the 70 degrees F setpoint and failed to stroke open ondemand.This event was determined to be reportable under the provisions of 10 CFR 50.73(a)(2)(v)(D),
as an event orcondition that could have prevented fulfillment of a safety function needed to mitigate the consequences ofan accident.
The station notified the NRC of this event via Emergency Notification 49286 at 1653 hours0.0191 days <br />0.459 hours <br />0.00273 weeks <br />6.289665e-4 months <br /> on8/15/13.
Issue Report 1547294 was initiated to investigate this event.NRC FORM 366A (10-2010)
NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION (10-2010)
LICENSEE EVENT REPORT (LER)CONTINUATION SHEET1. FACILITY NAME 2. DOCKET 6. LER NUMBER 3. PAGEI SEQUENTIAL REVYEAR NUMBER NO.Clinton Power Station, Unit 1 05000461 3 OF2013 -004 -00NARRATIVE C. CAUSE OF EVENTBased on review of the hydramotor maintenance history and failure analysis from the vendor, the apparentcause of the supply air damper failure to open was that the damper hydramotor experienced an end-of-life failure due to being installed beyond its recommended service life. The hydramotor failed as result of normalage-related degradation of the internal hydraulic pump [P]. The hydramotor had been installed for about 26years and the recommended service life is 10 years.The hydramotor was never replaced due to a significant change in hydramotor preventive maintenance (PM)scope in 2005 which should have treated the change as a first-time PM and revised the due date accordingly.
- However, the change to the PM retained the original scheduling date and allowed the hydramotor to remain inthe system beyond the recommended service life.D. SAFETY CONSEQUENCES This event had no actual consequences.
The Division 3 EDG was in its normal standby lineup at the time ofthis event. A failure of the supply air damper to open limits the amount of outside air that can be introduced into the EDG engine and fuel storage rooms to maintain room temperature and remove heat loading from theEDG operation.
If an event occurred requiring the Division 3 EDG to run at full load, the EDG could haveexceeded the analyzed heat load for the Division 3 EDG room prior to completion of the system's missiontime. During this event, the recirculation damper was open and allowing recirculation air flow; therefore, somecooling and heat removal was occurring.
Additionally, there is some inlet airflow due to seal leakage aroundthe damper blades and door seals in the fan room, but the amount of cooling this may provide is unknown.Prior to the event, on 8/14/13, the Division 3 EDG was satisfactorily started for Technical Specification surveillance testing at 0924 hours0.0107 days <br />0.257 hours <br />0.00153 weeks <br />3.51582e-4 months <br /> and run for approximately two hours without any evidence of damperfailures and no unexpected room temperature or pressure conditions noted.At the time of this event the Reactor Core Isolation Cooling System [BN] was operable and all Emergency Core Cooling Systems (with the exception of HPCS) were operable as well as AC power, including Divisions 1 and 2 EDGs. Although HPCS was declared inoperable, HPCS was available with offsite power.E. CORRECTIVE ACTIONSThe failed hydramotor was replaced, post maintenance testing was completed and functionality/operability was restored on. 8/17/13.An evaluation determined that critical, non-EQ hydramotors have the correct 10-year frequency PMestablished.
(EQ hydramotors have established PM strategies based on their EQ analyses and are notaffected by the cause of this event.)Ten additional hydramotors have been identified as being installed beyond the 10-year recommended lifeand will be replaced.
Applicable Engineering and Work Management staff will receive a tailgate on the failure to treat thesignificant change in PM scope as a new PM task.NRC FORM 366A (10-2010)
NFRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION (10-2010)
LICENSEE EVENT REPORT (LER)CONTINUATION SHEET1. FACILITY NAME 2. DOCKET 6. LER NUMBER 3. PAGESEQUENTIAL REVYEAR NUMBER NO.Clinton Power Station, Unit 1 05000461 4 OF2013 -004 -00NARRATIVE F. PREVIOUS OCCURRENCES A review for previous occurrences did not identify similar events at Clinton Power Station.G. COMPONENT FAILURE DATAComponent
==
Description:==
Modulating Air Damper Hydramotor/Actuator Manufacturer:
ITT General ControlsModel: NH91NRC FORM 366A (10-2010)