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Line 51: |
Line 51: |
| with a resulting start time of 9.69 seconds. DG1A was subsequently l | | with a resulting start time of 9.69 seconds. DG1A was subsequently l |
| declared OPERABLE at approximately 2330 on November 21, 1989. | | declared OPERABLE at approximately 2330 on November 21, 1989. |
| l Cause of Event A review of the start times for all three diesel generators was conducted. The Division 1 diesel genertor start times are noticeably more erratic than the start times of the other divisional diesel generators. While the solution to this event appears to be the readjustment of the diesel generator governors, other potential I concributing causes need to be evaluated and resolved. An Action Plan for resolution of the DG1A slow start times has been developed and is | | l Cause of Event A review of the start times for all three diesel generators was conducted. The Division 1 diesel genertor start times are noticeably more erratic than the start times of the other divisional diesel generators. While the solution to this event appears to be the readjustment of the diesel generator governors, other potential I concributing causes need to be evaluated and resolved. An Action Plan for resolution of the DG1A slow start times has been developed and is currently being implemented. The objectives of this Action Plan are to I identify the root cause and resolve those factors which may impact the , |
| ;
| |
| currently being implemented. The objectives of this Action Plan are to I identify the root cause and resolve those factors which may impact the , | |
| l ability of DGlA to routinely meet its starting requirements. The design l- and operating data currently available and observations made during these troubleshooting tests suggest a number of potential contributors to the problem. Under this Action Plan, Illinois Power will investigate these potential contributors to develop a basis for corrective actions. | | l ability of DGlA to routinely meet its starting requirements. The design l- and operating data currently available and observations made during these troubleshooting tests suggest a number of potential contributors to the problem. Under this Action Plan, Illinois Power will investigate these potential contributors to develop a basis for corrective actions. |
| Other factors that may be identified will be addressed appropriately. | | Other factors that may be identified will be addressed appropriately. |
|
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Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO
MONTHYEARML20029C6191994-04-14014 April 1994 Special Rept:On 940328,meteorological Tower Instrumentation Not Returned to Svc within Allowed Out of Svc Time.Caused by Difficulty in Calibr of Input Card.Meteorological Monitoring Instrumentation Declared Operable on 940408 ML20046A0321993-07-19019 July 1993 Special Rept:On 930704,TS Time Limit Expired for SGTS Exhaust Stack High Range Radioactivity Monitor Declared Inoperable on 930701 Due to Low Sample Flow Reading. Suspected Degraded Pump Replaced.Followup Will Be Provided ML20029B1901991-02-27027 February 1991 Rev to RO Dtd 910205 Re Valid Failure of Div II Diesel Generator During Surveillance Testing on 910106.Caused by Failure of A-3 Relay Tachometer Due to Broken Wire.Caution Added to Vendor Manual Re Bench Testing Relay ML20043D1631990-05-30030 May 1990 Supplemental Special Rept on Test Failures of Div I Diesel Generator at Plant on 891220 & 900111.Problem Caused by Misapplication of Woodward EGB13P Model 9903-266 Governor. Mods Not Warranted.Diesel Generator Being Tested Weekly ML20043B3021990-05-21021 May 1990 Special Rept:On 900502,during Performance of Semiannual Channel Calibr,Personnel Identified That 60-meter Wind Direction Instrumentation Not in Calibr.Instrumentation Declared Operable on 900510 After Procedure Completed ML20043A9821990-05-15015 May 1990 Ro:On 900508,discovered That Replacement Bellows Had Tie Rods Installed to Limit Bellows Expansion.Div I & II Diesel Generators Declared Inoperable & Controlled Plant Shutdown Initiated.Unusual Event Terminated on 900509 ML20012F0591990-03-29029 March 1990 Special Rept:On 891120-1230,valid Test Failures of Div I Diesel Generator.Current Valid Failure Count for Diesel Generator Is Three.Diesel Generator Continues to Be Tested on Weekly Basis Per Tech Spec Table 4.8.1.1.2.1 ML20006F6351990-02-20020 February 1990 Ro:On 900212,Tech Specs 3.6.1.8 & 3.6.1.1 Entered Due to Failed Local Leak Rate Test on Primary Containment Penetration MC-102.Plant Shutdown Commenced & Notification of Unsual Event Declared.Plant Placed in Shutdown Condition ML20006D1541990-01-29029 January 1990 Special Rept:On 891230,during Test to Restore Diesel Generator 1A to Operable Status Following Failure on 891227, Generator Cranked But Did Not Start.Caused by Failure of Contacts on K19 Control set-up Relay.Relay Replaced ML20005G3371990-01-11011 January 1990 Special Rept:On 891211,failure of Diesel Generator DG1A to Start Noted.Caused by Failure of K19 Starting Relay.Diesel Generator Governor & Defective Speed Sensing Relay Replaced ML20005F8111990-01-0404 January 1990 Special Rept:On 891219,differential Air Temp Instrumentation Inoperable for More than 7 Days.Caused by Problem in Temp Probe on Meteorological Tower.Tower Differential Temp Instrumentation Declared Operable on 891229 ML20005E0811989-12-20020 December 1989 Special Rept:On 891120,Div 1 Diesel Generator 1A Failed During Surveillance Testing.Caused by Erratic Start Times. Diesel Generator Governors Readjusted ML19332E6121989-11-29029 November 1989 Special Rept:On 891030,test Failure of Div II Diesel Generator Occurred.Caused by Cam/Spring Holding Fallen Screw in Console Section of Panel.Holding Screw Reinstalled in Switch.Control Switch Will Be Inspected in Upcoming Outage 1994-04-14
[Table view] Category:LER)
MONTHYEARML20029C6191994-04-14014 April 1994 Special Rept:On 940328,meteorological Tower Instrumentation Not Returned to Svc within Allowed Out of Svc Time.Caused by Difficulty in Calibr of Input Card.Meteorological Monitoring Instrumentation Declared Operable on 940408 ML20046A0321993-07-19019 July 1993 Special Rept:On 930704,TS Time Limit Expired for SGTS Exhaust Stack High Range Radioactivity Monitor Declared Inoperable on 930701 Due to Low Sample Flow Reading. Suspected Degraded Pump Replaced.Followup Will Be Provided ML20029B1901991-02-27027 February 1991 Rev to RO Dtd 910205 Re Valid Failure of Div II Diesel Generator During Surveillance Testing on 910106.Caused by Failure of A-3 Relay Tachometer Due to Broken Wire.Caution Added to Vendor Manual Re Bench Testing Relay ML20043D1631990-05-30030 May 1990 Supplemental Special Rept on Test Failures of Div I Diesel Generator at Plant on 891220 & 900111.Problem Caused by Misapplication of Woodward EGB13P Model 9903-266 Governor. Mods Not Warranted.Diesel Generator Being Tested Weekly ML20043B3021990-05-21021 May 1990 Special Rept:On 900502,during Performance of Semiannual Channel Calibr,Personnel Identified That 60-meter Wind Direction Instrumentation Not in Calibr.Instrumentation Declared Operable on 900510 After Procedure Completed ML20043A9821990-05-15015 May 1990 Ro:On 900508,discovered That Replacement Bellows Had Tie Rods Installed to Limit Bellows Expansion.Div I & II Diesel Generators Declared Inoperable & Controlled Plant Shutdown Initiated.Unusual Event Terminated on 900509 ML20012F0591990-03-29029 March 1990 Special Rept:On 891120-1230,valid Test Failures of Div I Diesel Generator.Current Valid Failure Count for Diesel Generator Is Three.Diesel Generator Continues to Be Tested on Weekly Basis Per Tech Spec Table 4.8.1.1.2.1 ML20006F6351990-02-20020 February 1990 Ro:On 900212,Tech Specs 3.6.1.8 & 3.6.1.1 Entered Due to Failed Local Leak Rate Test on Primary Containment Penetration MC-102.Plant Shutdown Commenced & Notification of Unsual Event Declared.Plant Placed in Shutdown Condition ML20006D1541990-01-29029 January 1990 Special Rept:On 891230,during Test to Restore Diesel Generator 1A to Operable Status Following Failure on 891227, Generator Cranked But Did Not Start.Caused by Failure of Contacts on K19 Control set-up Relay.Relay Replaced ML20005G3371990-01-11011 January 1990 Special Rept:On 891211,failure of Diesel Generator DG1A to Start Noted.Caused by Failure of K19 Starting Relay.Diesel Generator Governor & Defective Speed Sensing Relay Replaced ML20005F8111990-01-0404 January 1990 Special Rept:On 891219,differential Air Temp Instrumentation Inoperable for More than 7 Days.Caused by Problem in Temp Probe on Meteorological Tower.Tower Differential Temp Instrumentation Declared Operable on 891229 ML20005E0811989-12-20020 December 1989 Special Rept:On 891120,Div 1 Diesel Generator 1A Failed During Surveillance Testing.Caused by Erratic Start Times. Diesel Generator Governors Readjusted ML19332E6121989-11-29029 November 1989 Special Rept:On 891030,test Failure of Div II Diesel Generator Occurred.Caused by Cam/Spring Holding Fallen Screw in Console Section of Panel.Holding Screw Reinstalled in Switch.Control Switch Will Be Inspected in Upcoming Outage 1994-04-14
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARU-603277, Monthly Operating Rept for Sept 1999 for Clinton Power Station,Unit 1.With1999-09-30030 September 1999 Monthly Operating Rept for Sept 1999 for Clinton Power Station,Unit 1.With ML20217A1691999-09-22022 September 1999 Part 21 Rept Re Engine Sys,Inc Controllers,Manufactured Between Dec 1997 & May 1999,that May Have Questionable Soldering Workmanship.Caused by Inadequate Personnel Training.Sent Rept to All Nuclear Customers U-603267, Monthly Operating Rept for Aug 1999 for Clinton Power Station,Unit 1.With1999-08-31031 August 1999 Monthly Operating Rept for Aug 1999 for Clinton Power Station,Unit 1.With U-603245, Monthly Operating Rept for Jul 1999 for CPS Unit 1.With1999-07-31031 July 1999 Monthly Operating Rept for Jul 1999 for CPS Unit 1.With ML20211C9621999-07-26026 July 1999 ISI Summary Rept U-603232, Special Rept:On 990531 Lpms Was Declared Inoperable Due to Receipt of High Vibration & Loose Parts Alarm Which Did Not Clear.Lpms Was Restored to Operable Status on 990707 After Alignment & Tension on Recorder Tape Drive Was Adjusted1999-07-0909 July 1999 Special Rept:On 990531 Lpms Was Declared Inoperable Due to Receipt of High Vibration & Loose Parts Alarm Which Did Not Clear.Lpms Was Restored to Operable Status on 990707 After Alignment & Tension on Recorder Tape Drive Was Adjusted U-603233, Monthly Operating Rept for June 1999 for Clinton Power Station,Unit 1.With1999-06-30030 June 1999 Monthly Operating Rept for June 1999 for Clinton Power Station,Unit 1.With U-603222, Monthly Operating Rept for May 1999 for Clinton Power Station.With1999-05-31031 May 1999 Monthly Operating Rept for May 1999 for Clinton Power Station.With ML20210K8391999-05-11011 May 1999 British Energy Annual Rept & Accounts 1998-99 ML20206H1231999-05-0505 May 1999 Illinois Power Co CPS Main CR Simulator Certification Rept U-603210, Monthly Operating Rept for Apr 1999 for Cps,Unit 1.With1999-04-30030 April 1999 Monthly Operating Rept for Apr 1999 for Cps,Unit 1.With U-603204, Final Part 21 Rept 21-99-003 Re Deficiency in Commercial Grade Dedication Process Used by Circuit Breaker Refurbishment Supplier Trentec for Westinghouse Breaker 1AP05EH.Issue Determined Not Reportable Per 10CFR211999-04-30030 April 1999 Final Part 21 Rept 21-99-003 Re Deficiency in Commercial Grade Dedication Process Used by Circuit Breaker Refurbishment Supplier Trentec for Westinghouse Breaker 1AP05EH.Issue Determined Not Reportable Per 10CFR21 U-603192, Monthly Operating Rept for Mar 1999 for Clinton Power Station,Unit 1.With1999-03-31031 March 1999 Monthly Operating Rept for Mar 1999 for Clinton Power Station,Unit 1.With U-603182, Part 21 Rept Re Deficiency in Commercial Grade Dedication Process Used by Circuit Breaker Refurbishment Supplier, Trentec.Condition Rept 1-99-01-136 Was Initiated to Track Investigation & Resolution of Issue1999-03-12012 March 1999 Part 21 Rept Re Deficiency in Commercial Grade Dedication Process Used by Circuit Breaker Refurbishment Supplier, Trentec.Condition Rept 1-99-01-136 Was Initiated to Track Investigation & Resolution of Issue U-603176, Monthly Operating Rept for Feb 1999 for Clinton Power Station,Unit 1.With1999-02-28028 February 1999 Monthly Operating Rept for Feb 1999 for Clinton Power Station,Unit 1.With ML20207F2031999-02-10010 February 1999 Rev 1 to CPS COLR for Reload 6 Cycle 7 ML20202J0181999-02-0303 February 1999 SER Accepting Changes in Quality Assurance Program,Which Continues to Meet Requirements of App B to 10CFR50 U-603144, Monthly Operating Rept for Dec 1998 for Clinton Power Station,Unit 1.With1998-12-31031 December 1998 Monthly Operating Rept for Dec 1998 for Clinton Power Station,Unit 1.With U-603223, Illinova Corp 1998 Annual Rept. with1998-12-31031 December 1998 Illinova Corp 1998 Annual Rept. with U-603115, Part 21 Interim Rept 21-98-021 Re Deficiencies in Matl Dedication Process Used by Goulds Pumps in Supplying SR Parts to Npps.Issue Is Not Reportable Under 10CFR21. Dedication Process Did Not Affect Ability of Components1998-12-0404 December 1998 Part 21 Interim Rept 21-98-021 Re Deficiencies in Matl Dedication Process Used by Goulds Pumps in Supplying SR Parts to Npps.Issue Is Not Reportable Under 10CFR21. Dedication Process Did Not Affect Ability of Components U-603124, Monthly Operating Rept for Nov 1998 for Clinton Power Station,Unit 1.With1998-11-30030 November 1998 Monthly Operating Rept for Nov 1998 for Clinton Power Station,Unit 1.With U-603114, Part 21 Rept 21-98-049 Re W Dhp Circuit Breaker Refurbished by Nuclear Logistics,Inc Which Failed to Operate.Caused by Trip Latch out-of-adjustment & Incorrectly Sized Ratchet Lever Assembly Bushing.Breakers Were Returned to Vendor1998-11-25025 November 1998 Part 21 Rept 21-98-049 Re W Dhp Circuit Breaker Refurbished by Nuclear Logistics,Inc Which Failed to Operate.Caused by Trip Latch out-of-adjustment & Incorrectly Sized Ratchet Lever Assembly Bushing.Breakers Were Returned to Vendor U-603103, Monthly Operating Rept for Oct 1998 for Clinton Power Station,Unit 1.With1998-10-31031 October 1998 Monthly Operating Rept for Oct 1998 for Clinton Power Station,Unit 1.With U-603101, Special Rept:On 980918,discovered That Triaxial Seismic Accelerometers Had Not Been Properly Calibrated.Caused by Inadequate Calibration Procedure.Calibration to Be Performed off-site1998-10-28028 October 1998 Special Rept:On 980918,discovered That Triaxial Seismic Accelerometers Had Not Been Properly Calibrated.Caused by Inadequate Calibration Procedure.Calibration to Be Performed off-site ML20154F8701998-10-0606 October 1998 Safety Evaluation Authorizing Proposed Alternative to Requirements of OMa-1988,Part 10,Section 4.2.2.3 for 21 Category a Reactor Coolant Sys Pressure Isolation Valves U-603091, Monthly Operating Rept for Sept 1998 for Clinton Power Station,Unit 1.With1998-09-30030 September 1998 Monthly Operating Rept for Sept 1998 for Clinton Power Station,Unit 1.With ML20153F9871998-09-17017 September 1998 Safety Evaluation Accepting 980225 Proposed Rev 26 to Illinois Power Nuclear Program Qam ML20151U1391998-08-31031 August 1998 Monthly Operating Rept for Aug 1998 for Clinton Power Station,Unit 1 ML20237E3991998-08-27027 August 1998 SER Accepting Licensee Response to NRC Bulletin 95-002, Unexpected Clogging of Residual Heat Removal Pump Strainer While Operating in Suppression Pool Cooling Mode, for Clinton Power Station ML20237A1521998-08-0707 August 1998 SER Re Mgt Services Agreement at Clinton Power Station. Approval Under 10CFR50.80 Not Required ML20151Y6591998-07-31031 July 1998 Monthly Operating Rept for July 1998 for Clinton Power Station,Unit 1 U-603033, Part 21 Rept 21-98-039 Re Shrinkage of Medium & High Density Silicone Seals Designed & Installed by Bisco Using Dow Corning Sylgard 170 Matl.Caused by Coefficient of Thermal Expansion.Will Inspect & Rework/Repair Suspected Seals1998-07-20020 July 1998 Part 21 Rept 21-98-039 Re Shrinkage of Medium & High Density Silicone Seals Designed & Installed by Bisco Using Dow Corning Sylgard 170 Matl.Caused by Coefficient of Thermal Expansion.Will Inspect & Rework/Repair Suspected Seals U-603041, Monthly Operating Rept for June 1998 for Clinton Power Station,Unit 11998-06-30030 June 1998 Monthly Operating Rept for June 1998 for Clinton Power Station,Unit 1 ML20151U1501998-06-30030 June 1998 Revised Monthly Operating Rept for June 1998 for Clinton Power Station,Unit 1 U-603023, Monthly Operating Rept for May 1998 for Clinton Power Station,Unit 11998-05-31031 May 1998 Monthly Operating Rept for May 1998 for Clinton Power Station,Unit 1 U-603014, Special Rept:On 980512,lightning Struck Primary Meteorological Monitoring Instrumentation Tower Damaging 60- Meter Wind Speed & Associated Transmuter Circuit Card. Surveillance Testing Performed1998-05-28028 May 1998 Special Rept:On 980512,lightning Struck Primary Meteorological Monitoring Instrumentation Tower Damaging 60- Meter Wind Speed & Associated Transmuter Circuit Card. Surveillance Testing Performed ML20236E7991998-05-26026 May 1998 Final Part 21 Rept Re W Dhp Circuit Breaker Auxillary Switch Operating Assembly Anomalies.Caused by Loss of Breaker Safety Function.Dhp Circuit Will Be Inspected ML20248F3531998-05-21021 May 1998 Part 21 Rept Re Electronic Equipment Repaired or Reworked by Integrated Resources,Inc from Approx 930101-980501.Caused by 1 Capacitor in Each Unit Being Installed W/Reverse Polarity. Policy of Second Checking All Capacitors Is Being Adopted U-603004, Part 21 Rept Re 980107 Determination That Itt Barton Model 580A Series Differential Pressure Indicating Switches Operating Forces Too Low.Manufacturing Sys Allowed Switches to Be Mixed.Evaluation Concludes Issue Not Reportable1998-05-15015 May 1998 Part 21 Rept Re 980107 Determination That Itt Barton Model 580A Series Differential Pressure Indicating Switches Operating Forces Too Low.Manufacturing Sys Allowed Switches to Be Mixed.Evaluation Concludes Issue Not Reportable ML20216A9601998-05-0808 May 1998 Part 21 Rept Re Failure of 12 Volt DC Inverter Power Supply. Caused by Inadequately Sized Output Transistor Pair Combined W/Degraded Capacitors.Licensee Plans to Replace All Output Transistors & Degraded Capacitors U-602995, Part 21 Interim Rept 21-98-021 Re Deficiencies in Matl Dedication Process Used by Goulds Pumps During Use of Portable Metal Analyzer.Util Identified Discrepancies Which Are Acceptable W/Some Exception of Some Replacement Parts1998-05-0505 May 1998 Part 21 Interim Rept 21-98-021 Re Deficiencies in Matl Dedication Process Used by Goulds Pumps During Use of Portable Metal Analyzer.Util Identified Discrepancies Which Are Acceptable W/Some Exception of Some Replacement Parts U-603006, Monthly Operating Rept for Apr 1998 for Clinton Power Station,Unit 11998-04-30030 April 1998 Monthly Operating Rept for Apr 1998 for Clinton Power Station,Unit 1 U-602994, Part 21 Rept Re Final Rept 21-98-008,on 980113,reliance Electric Motors Supplied by Rockwell International for Hydrogen Recombiner Cooling Fans Do Not Have nameplate- Specified High Temperature Bearings.Fan Motors Acceptable1998-04-29029 April 1998 Part 21 Rept Re Final Rept 21-98-008,on 980113,reliance Electric Motors Supplied by Rockwell International for Hydrogen Recombiner Cooling Fans Do Not Have nameplate- Specified High Temperature Bearings.Fan Motors Acceptable ML20216B1351998-04-21021 April 1998 Rev 0 to Illinois Power Co Clinton Power Station SVC Design Rept U-602979, Final Part 21 Rept 21-97-059 Re Discrepancies Found During Receipt Insp of Three Refurbished safety-related W Dhp Circuit Breakers.Util Completed Evaluation,Per 10CFR21 & Concludes That Condition Is Not Reportable1998-04-0707 April 1998 Final Part 21 Rept 21-97-059 Re Discrepancies Found During Receipt Insp of Three Refurbished safety-related W Dhp Circuit Breakers.Util Completed Evaluation,Per 10CFR21 & Concludes That Condition Is Not Reportable U-602976, Monthly Operating Rept for Mar 1998 for Clinton Power Station1998-03-31031 March 1998 Monthly Operating Rept for Mar 1998 for Clinton Power Station ML20217H5771998-03-27027 March 1998 Safety Evaluation Concluding That No Significant Safety Hazards Introduced at CPS for Net 32% Ampacity Derating Factor for 1 H & 3 H Conduit Fire Barrier Sys & 1 H Cable Tray Fire Barrier Sys.Requests Response Addressing Issue U-602968, Interim Part 21 Rept 21-97-055 Re Westinghouse Dhp Circuit Breaker Auxiliary Switch Operating Assembly Anomalies. Initially Reported on 980116.Util Currently Evaluating Suppliers Response to Questions Re Issue1998-03-24024 March 1998 Interim Part 21 Rept 21-97-055 Re Westinghouse Dhp Circuit Breaker Auxiliary Switch Operating Assembly Anomalies. Initially Reported on 980116.Util Currently Evaluating Suppliers Response to Questions Re Issue U-602960, Part 21 & Deficiency Rept Re Commerical Grade Dedication Program of Sentry Equipment Corp.Initially Reported on 980217.IP Performed an Addl Assessment at Sentry Facility on 980226.Next Rept Will Be Submitted by 9804111998-03-12012 March 1998 Part 21 & Deficiency Rept Re Commerical Grade Dedication Program of Sentry Equipment Corp.Initially Reported on 980217.IP Performed an Addl Assessment at Sentry Facility on 980226.Next Rept Will Be Submitted by 980411 U-602954, Interim Part 21 rept,21-98-008 Re Identification That Bearings Installed in Hydrogen Recombiner B Cooling Fan Motor 0HG04CB Were Not Same as Bearings Specified on Motor Nameplate.Will Complete Evaluation of Issue by 9805131998-03-0909 March 1998 Interim Part 21 rept,21-98-008 Re Identification That Bearings Installed in Hydrogen Recombiner B Cooling Fan Motor 0HG04CB Were Not Same as Bearings Specified on Motor Nameplate.Will Complete Evaluation of Issue by 980513 1999-09-30
[Table view] |
Text
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-itLINDIS POWER COMPANY CLINToN POntR STATION. P.o. BOX 678. CLINTON. ILLINOIS 01727 M10n11Y RMIR December 20, 1989 %d
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Docket No. 50-461 Mr. A. B. Da'ris
-Regional Administrator
' Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 e
Subject:
frectal Report: Test Failure of Division I Diesel Generator at Clinton Power Station (CPS)
Dear Mr. Davis:
CPS Technical Specification 4.8.1.1.3 requires all diesel generator failures, valid or non valfd, to be reported to the NRC pursuant,to Specification 6.9.2, SPECIAL REPORTS. Due to a failure of the Division I Diesel Generator'(DG1A) during surveillance testing on November 20, 1989,ethis SPECIAL REPORT is being submitted in accordance with the CPS Technical Specifications to provide the information required by Regulatory Gufde 1.108, Revision 1 " Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants," Regulatory Position C.3.b.
Descriotion of Event At 1256 hours0.0145 days <br />0.349 hours <br />0.00208 weeks <br />4.77908e-4 months <br /> on November 20, 1989, during the performance of CPS Procedure 9080.01, " Diesel Generator 1A (IB) Operability - Manual," DG1A failed to reach rated speed in less than or equal to 12.0 seconds as required by Technical Specification 4.8.1.1.2.a.4. The recorded time to reach rated speed was 12.77 seccnds. DG1A was declared inoperable and 'y the appropriate Technical Specification ACTION was entered. ,
At approximately 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />, Nuclear Station Engineering and a vendor, Woodward Governor, were contacted. After consultation with g
Woodward representatives and a careful review of the data recorded I during the start, the decision was :nade to compare the speed controller settings of DG1A with those of the Division II Diesel (DG1B). The as-found speed controller settings of DG1A were noticeably different than those of DG1B. With DG1A still operating subsequent to the slow start, fjjlOgOCK223 891220 s 05000461 PDC h ,1 t
i adjustments to the DGlA speed controller were made under Engineering guidance to more closely match the DGlA speed controller settings with l those of the Division II Diesel. Following these adjustments, DG1A !
would not stabilize under no load conditions. Woodward Governor was i
, then contacted to provide a service representative on site. Continued adjustments of the DGlA speed controller under Engineering guidance achieved better stability. DGlA was then shut down and allowed to cool j to ambient temperature.
l At 2258 hours0.0261 days <br />0.627 hours <br />0.00373 weeks <br />8.59169e-4 months <br />, plant personnel initiated another maintenance start of DGlA. Rated speed was achieved in 9.54 seconds. DGlA was then shut down to await arrival of the Woodward Governor service representative.
At approximately 0900 hours0.0104 days <br />0.25 hours <br />0.00149 weeks <br />3.4245e-4 months <br /> on November 21, 1989, the Woodward Governor service representative arrived on site and was briefed on the current status of the investigation. At approximately 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, Maintenance, Engineering and the service representative met with Operations to discuss further actions to be performed.
At 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br />, a maintenance start of DGlA was performed to allow the service representative to monitor the starting characteristics. The resulting start time for this run was 9.84 seconds. Maintenance personnel performed adjustments as directed by the service representative. The engine was then monitored in a no load condition, as well as at 20% load. DG1A was then shut down and allowed to cool to ;
ambient temperature.
At 1744 hours0.0202 days <br />0.484 hours <br />0.00288 weeks <br />6.63592e-4 months <br />, a post maintenance testing start of DG1A was performed with a resulting start time of 9.69 seconds. At 1746 hours0.0202 days <br />0.485 hours <br />0.00289 weeks <br />6.64353e-4 months <br />, DG1A was shut down and allowed to cool.
At 2104 hours0.0244 days <br />0.584 hours <br />0.00348 weeks <br />8.00572e-4 months <br />, the Surveillance run was successfully completed l
with a resulting start time of 9.69 seconds. DG1A was subsequently l
declared OPERABLE at approximately 2330 on November 21, 1989.
l Cause of Event A review of the start times for all three diesel generators was conducted. The Division 1 diesel genertor start times are noticeably more erratic than the start times of the other divisional diesel generators. While the solution to this event appears to be the readjustment of the diesel generator governors, other potential I concributing causes need to be evaluated and resolved. An Action Plan for resolution of the DG1A slow start times has been developed and is currently being implemented. The objectives of this Action Plan are to I identify the root cause and resolve those factors which may impact the ,
l ability of DGlA to routinely meet its starting requirements. The design l- and operating data currently available and observations made during these troubleshooting tests suggest a number of potential contributors to the problem. Under this Action Plan, Illinois Power will investigate these potential contributors to develop a basis for corrective actions.
Other factors that may be identified will be addressed appropriately.
l (2)
i 4.
Corrective Action As identified above, speed controller adjustments under the direction of the Woodward Governor service representative provided adequate corrective action to restore DG1A to OPERABLE status. The Action Plan teing developed will provide long-term generic corrective action. The objective of the action plan is to install instrumentation on the diesel generator fuel oil and air start systems and gather ;
technical data. This will require scheduling the data gathering and inspections around the required surveillances and scheduling appropriate ,
diesel generator outage times. l Additional Information 1 i
This event represents the second valid failure in the last 20 valid tests for DG1A (and the fifth valid failure in the 60 valid tests !
that have been performed for DG1A since receipt of the operating )
license). Therefore, the surveillance frequency for DG1A has been ;
increased to once per 7 days in accordance with Technical Specification 1 Table 4.8.1.1.2 1. )
On December 11, 19E9, DG1A experienced an additional slow start.
The SPECIAL REPORT prepared in response to that event will be submitted on or before January 10, 1990, and will include additional information regarding the available results obtained from the DGIA Action Plan discussed in this letter as they apply to the root cause determination of the November 20, and December 11, 1989 failures. The Action Plan will be completed and a final report will be submitted describing the root cause and corrective actions taken to correct the DG1A slow starting condition on or before March 30, 1990. In the meantime, the diesel will be tested at the frequency in accordance with the Technical Specifications.
Sincerely yours, :
A D. L. Holtzscher Acting Manager -
Licensing and Safety DAS/ktm cc: NRC Clinton Licensing Project Manager NRC Resident Office NRC Document Control Desk Illinois Department of Nuclear Safety (3)