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Category:Letter
MONTHYEARML24211A2302024-09-11011 September 2024 – Request for Partial Site Release for Facility Operating License No. NPF-62 RS-24-087, Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Clinton Power Station2024-09-0909 September 2024 Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Clinton Power Station IR 05000461/20240112024-09-0909 September 2024 Commercial Grade Dedication Inspection Report 05000461/2024011 IR 05000461/20240052024-08-29029 August 2024 Updated Inspection Plan and Assessment Follow-Up Letter for Clinton Power Station (Report 05000461/2024005) ML24222A3952024-08-23023 August 2024 Regulatory Audit Report to Support the Review of the Amendments to Revise Reactor Water Cleanup Valve Isolation Timing IR 05000461/20240022024-08-0909 August 2024 Integrated Inspection Report 05000461/2024002 ML24222A6772024-08-0909 August 2024 Response to Request for Additional Information for Application to Revise Technical Specifications to Adopt TSTF-591-A, Revise Risk Informed Completion Time (RICT) Program Revision 0 and Revise 10 CFR 50.69 License Condition ML24220A2772024-08-0707 August 2024 Request for Information for the NRC Quadrennial Comprehensive Engineering Team Inspection: Inspection Report 05000461/2025010 ML24212A2212024-08-0202 August 2024 License Renewal Regulatory Audit Regarding the Environmental Review of the License Renewal Application (EPID Number: L-2024-LNE-0000) (Docket Number: 50-461) ML24157A3242024-07-11011 July 2024 Issuance of Amendment No. 254 Revision of Reactor Water Cleanup Isolation Valve Timing ML24158A0772024-07-0303 July 2024 Notice of Consideration of Approval of Partial Site Release, Public Meeting, and Request for Comments (EPID L-2023-LLA-0088) - Letter ML24163A3252024-06-28028 June 2024 Aging Management Regulatory Audit Plan ML24163A3242024-06-28028 June 2024 LRA - Portal Letter ML24179A3112024-06-27027 June 2024 05000461; Notification of an NRC Biennial Licensed Operator Requalification Program Inspection and Request for Information ML24176A0272024-06-25025 June 2024 Confirmation of Initial License Examination, July 2025 RS-24-061, Constellation Energy Generation, LLC, Response to NRC Regulatory Issue Summary 2024-01, Preparation and Scheduling of Operator Licensing Examinations2024-06-14014 June 2024 Constellation Energy Generation, LLC, Response to NRC Regulatory Issue Summary 2024-01, Preparation and Scheduling of Operator Licensing Examinations ML24079A0762024-05-23023 May 2024 Issuance of Amendments to Adopt TSTF 264 ML24142A3352024-05-21021 May 2024 Quad Cities—Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes IR 05000461/20240122024-05-20020 May 2024 Biennial Problem Identification and Resolution Inspection Report Report 05000461/2024012 RS-24-055, 2023 Corporate Regulatory Commitment Change Summary Report2024-05-17017 May 2024 2023 Corporate Regulatory Commitment Change Summary Report RS-24-050, Additional Information Supporting Request for License Amendment to Revise Technical Specifications Related to Reactor Water Cleanup Isolation Instrumentation2024-05-0909 May 2024 Additional Information Supporting Request for License Amendment to Revise Technical Specifications Related to Reactor Water Cleanup Isolation Instrumentation IR 05000461/20240012024-05-0707 May 2024 Integrated Inspection Report 05000461/2024001 ML24103A1032024-05-0101 May 2024 SHPO Consultation Letter for Clinton License Renewal ML24120A3462024-04-30030 April 2024 Ltr. to Douglas Lankford, Chief, Miami Tribe of Oklahoma; Re., CPS Section 106 Consultation ML24120A3452024-04-30030 April 2024 Ltr. to Lester Randell, Chairman, Kickapoo Tribe of Indians of the Kickapoo Reservation in Kansas; Re., CPS Section 106 Consultation ML24103A0992024-04-30030 April 2024 Achp Scoping Letter for Clinton License Renewal ML24120A3432024-04-30030 April 2024 Ltr. to Darwin Kaskaske, Chairman, Kickapoo Tribe of Oklahoma; Re., CPS Section 106 Consultation ML24120A3442024-04-30030 April 2024 Ltr. to Gena Kakkak, Chairman, Menominee Indian Tribe of Wisconsin; Re., CPS Section 106 Consultation ML24103A1152024-04-30030 April 2024 Ltr. to Geoffrey Standing Bear, Principal Chief, the Osage Nation; Re., CPS Section 106 Consultation RS-24-041, Alternative Request to Utilize Code Case OMN-32, Alternative Requirements for Range and Accuracy of Pressure, Flow, and Differential Pressure Instruments Used in Pump Tests2024-04-30030 April 2024 Alternative Request to Utilize Code Case OMN-32, Alternative Requirements for Range and Accuracy of Pressure, Flow, and Differential Pressure Instruments Used in Pump Tests ML24107B0312024-04-29029 April 2024 Notice of Intent to Prepare an Environmental Impact Statement and Conduct Scoping Process ML24103A2042024-04-12012 April 2024 Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-591-A, Revise Risk Informed Completion Time (RICT) Program Revision 0 and Revise 10 CFR 50.69 License Condition ML24089A2222024-04-11011 April 2024 LRA - Acceptance and Opportunity for Hearing - Letter ML24092A3452024-04-0101 April 2024 Updated Safety Analysis Report (Usar), Revision 23 RS-24-002, Constellation Energy Generation, LLC - Annual Property Insurance Status Report2024-04-0101 April 2024 Constellation Energy Generation, LLC - Annual Property Insurance Status Report ML24092A3552024-04-0101 April 2024 Request for Information for NRC License Renewal Inspection: Inspection Report 05000461/2024010 RS-24-023, Report on Status of Decommissioning Funding.2024-03-22022 March 2024 Report on Status of Decommissioning Funding. ML24045A1422024-02-29029 February 2024 License Renewal Application Receipt and Availability - Letter IR 05000461/20230062024-02-28028 February 2024 Annual Assessment Letter for Clinton Power Station (Report 05000461/2023006) ML24054A7112024-02-23023 February 2024 Request for Information for NRC Commercial Grade Dedication Inspection: Inspection Report 05000461/2024011 ML24045A0242024-02-14014 February 2024 Application for Renewed Operating License RS-24-005, Additional Information Supporting Request for Partial Site Release2024-02-0808 February 2024 Additional Information Supporting Request for Partial Site Release ML23338A1102024-02-0606 February 2024 Issuance of Amendment No. 252 Revision of Technical Specification 3.8.3, Diesel Fuel Oil, and Starting Air IR 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 2024-09-09
[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
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Description:==
Modulating Air Damper Hydramotor/Actuator Manufacturer:
ITT General ControlsModel: NH91NRC FORM 366A (10-2010)