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Category:LICENSEE EVENT REPORT (SEE ALSO AO RO)
MONTHYEAR05000416/LER-1993-011, Corrected LER 93-011-00:on 931007,loss of Shutdown Cooling & ESF Actuation Occurred.Caused by Operator Error.Event Discussed W/Operations Personnel & Info Labels Placed on Inverter Panels at Power Supply Switch1993-11-0808 November 1993 Corrected LER 93-011-00:on 931007,loss of Shutdown Cooling & ESF Actuation Occurred.Caused by Operator Error.Event Discussed W/Operations Personnel & Info Labels Placed on Inverter Panels at Power Supply Switch 05000416/LER-1993-0071993-08-26026 August 1993 LER 93-007-00:on 930723,violation of OL Condition 2.C.(38) Occurred Due to Access Points Not Clearly Marked to Identify Envelope Boundary.Marked Access panels.W/930826 Ltr 05000416/LER-1993-0061993-08-20020 August 1993 LER 93-006-00:on 930720 & 21,annunciator,specifying High Temp in RHR Sys Equipment Room Received in Cr,Causing RCIC Sys Isolation.Caused by Failure of Equipment Room Differential Temp Switch.Switch replaced.W/930820 Ltr 05000416/LER-1993-0031993-08-12012 August 1993 LER 93-003-01:on 930324,SSW C Sys Pump Motor Failed Due to Movement of Motor Stator End Windings During Motor star-ups.SSW C Pump Replaced & Failed Motor Refurbished by GE & Being receipt-inspected.W/930812 Ltr 05000416/LER-1990-0081990-06-20020 June 1990 LER 90-008-00:on 900521,discovered That Fire Rated Door Required by Tech Spec 3/4.7.7 Not Designated as Tech Spec Door in Ssurveillance Procedures.Caused by Incorrect Interpretation of Tech Spec requirements.W/900620 Ltr 05000416/LER-1987-006, Corrected LER 87-006-00:on 870501,isolation Valve in Steam Supply Piping to RCIC Sys Turbine Inadvertently Isolated. Caused by Personnel Error.Personnel Counseled1987-05-29029 May 1987 Corrected LER 87-006-00:on 870501,isolation Valve in Steam Supply Piping to RCIC Sys Turbine Inadvertently Isolated. Caused by Personnel Error.Personnel Counseled 05000416/LER-1984-050, Corrected LER 84-050-03:on 841102,condition on 841015 Re Safe shutdown-related Cables Found W/Omitted Fire Rated Barriers Determined Outside Design Basis.Design Change Documents Initiated1985-08-15015 August 1985 Corrected LER 84-050-03:on 841102,condition on 841015 Re Safe shutdown-related Cables Found W/Omitted Fire Rated Barriers Determined Outside Design Basis.Design Change Documents Initiated 05000416/LER-1984-020, Revised LER 84-020-01:on 840423,24 & 0514,during Startup, Five Reactor Water Cleanup Sys Isolations Occurred Due to Feedwater Flow Oscillations1984-06-0606 June 1984 Revised LER 84-020-01:on 840423,24 & 0514,during Startup, Five Reactor Water Cleanup Sys Isolations Occurred Due to Feedwater Flow Oscillations 05000416/LER-1984-002, Final LER 84-002-02:on 840107,09,11,14,19 & 20 & 0223 & 24, Reactor Protective Sys Bus Breaker Trips Resulted in Loss of Shutdown Cooling.Trip on 840119 Caused by Circuit Board Failure.Remainder Caused by Voltage Transients1984-05-30030 May 1984 Final LER 84-002-02:on 840107,09,11,14,19 & 20 & 0223 & 24, Reactor Protective Sys Bus Breaker Trips Resulted in Loss of Shutdown Cooling.Trip on 840119 Caused by Circuit Board Failure.Remainder Caused by Voltage Transients 05000416/LER-1984-018, Corrected LER 84-018-00:on 840414,shutdown Cooling Sys Isolation Occurred When Technician Lifted Wrong Lead During Performance of Monthly Surveillance.Technician Reprimanded, Lead Terminated & Shutdown Cooling Restored1984-05-10010 May 1984 Corrected LER 84-018-00:on 840414,shutdown Cooling Sys Isolation Occurred When Technician Lifted Wrong Lead During Performance of Monthly Surveillance.Technician Reprimanded, Lead Terminated & Shutdown Cooling Restored 05000416/LER-1983-136, Updated LER 83-136/03X-4:on 830830,Div 1 Diesel Generator Shut Down Due to Failure of Exhaust Gaskets on RB1 & LB5 Cylinders & Two Broken Welds on Intercoolers.Caused by Loose Manifold Bolts & Turbocharger misalignment.W/8403301984-03-30030 March 1984 Updated LER 83-136/03X-4:on 830830,Div 1 Diesel Generator Shut Down Due to Failure of Exhaust Gaskets on RB1 & LB5 Cylinders & Two Broken Welds on Intercoolers.Caused by Loose Manifold Bolts & Turbocharger misalignment.W/840330 Ltr 05000416/LER-1984-005, Updated LER 84-005-01:on 840119,drywell Purge Compressor Logic a Relay Compressor Inadvertently Started.Caused by Defective Procedure.Memo Written to All Technical Section Engineers Re Adequate Engineering Review1984-03-30030 March 1984 Updated LER 84-005-01:on 840119,drywell Purge Compressor Logic a Relay Compressor Inadvertently Started.Caused by Defective Procedure.Memo Written to All Technical Section Engineers Re Adequate Engineering Review 05000416/LER-1983-078, Updated LER 83-078/03X-2:on 830701,control Room Operator Unable to Maintain Air Receiver Pressure for Diesel Generator 11.Caused by Setpoint Drift & Damaged Valve Seals. Sensing Point to Air Receiving Tanks relocated.W/840330 L1984-03-30030 March 1984 Updated LER 83-078/03X-2:on 830701,control Room Operator Unable to Maintain Air Receiver Pressure for Diesel Generator 11.Caused by Setpoint Drift & Damaged Valve Seals. Sensing Point to Air Receiving Tanks relocated.W/840330 Ltr 05000416/LER-1983-107, Updated LER 83-107/03X-2:on 830726,during Test,Mounting Bolts for Div 1 Diesel Generator Turbocharger Found Loose or Broken & Associated Parts & Welds Cracked.Caused by Misaligned Turbocharger.Longer Bolts installed.W/840327 Lt1984-03-27027 March 1984 Updated LER 83-107/03X-2:on 830726,during Test,Mounting Bolts for Div 1 Diesel Generator Turbocharger Found Loose or Broken & Associated Parts & Welds Cracked.Caused by Misaligned Turbocharger.Longer Bolts installed.W/840327 Ltr 05000416/LER-1983-187, Updated LER 83-187/03X-1:on 831122,maint Technicians Filling Ref Leg Caused Spike on Reactor Vessel Level Transmitters, Resulting in Div 1 Automatic Actuations.Caused by Personnel error.W/840326 Ltr1984-03-26026 March 1984 Updated LER 83-187/03X-1:on 831122,maint Technicians Filling Ref Leg Caused Spike on Reactor Vessel Level Transmitters, Resulting in Div 1 Automatic Actuations.Caused by Personnel error.W/840326 Ltr 05000416/LER-1982-080, Update LER 82-080/01X-4:on 821004,capscrew on Div 2 Standby Diesel Generator Securing Rear Crankcase Cover to Engine Block Cracked.Caused by Fatigue Due to Engine Operation. Capscrews Replaced1984-03-21021 March 1984 Update LER 82-080/01X-4:on 821004,capscrew on Div 2 Standby Diesel Generator Securing Rear Crankcase Cover to Engine Block Cracked.Caused by Fatigue Due to Engine Operation. Capscrews Replaced 05000416/LER-1983-169, Corrected LER 83-169/03X-1:on 831023,nitrogen Pressure Control Rod Scram Accumulators 40-53 & 24-29 Fell Below Tech Specs.Caused by Normal Leakage.Accumulators Recharged.W/ 840321 Ltr1984-03-21021 March 1984 Corrected LER 83-169/03X-1:on 831023,nitrogen Pressure Control Rod Scram Accumulators 40-53 & 24-29 Fell Below Tech Specs.Caused by Normal Leakage.Accumulators Recharged.W/ 840321 Ltr 05000416/LER-1983-190, Updated LER 83-190/03X-1:on 831214,Div 2 Isolation Occurred, Causing Loss of Shutdown Cooling When Pump Suction Valve F009 Isolated.Caused by Temporary Outage Restoration Procedure Error.Procedure retired.W/840321 Ltr1984-03-21021 March 1984 Updated LER 83-190/03X-1:on 831214,Div 2 Isolation Occurred, Causing Loss of Shutdown Cooling When Pump Suction Valve F009 Isolated.Caused by Temporary Outage Restoration Procedure Error.Procedure retired.W/840321 Ltr 05000416/LER-1983-188, Updated LER 83-188/03X-1:on 831201,reactor Protection Sys Bus B & Shutdown Cooling Lost When Power Supply Breaker Tripped.Caused by Isolation Valve on Suction of Pump Closing.Time Delay Setting Increased to 3.5 s.W/840321 Ltr1984-03-21021 March 1984 Updated LER 83-188/03X-1:on 831201,reactor Protection Sys Bus B & Shutdown Cooling Lost When Power Supply Breaker Tripped.Caused by Isolation Valve on Suction of Pump Closing.Time Delay Setting Increased to 3.5 s.W/840321 Ltr 05000416/LER-1983-122, Updated LER 83-122/01X-1:on 830908,valve P64F467 Which Supplies Operating Pressure to CO2 Fire Protection Master Selector Valve Found Closed.Cause Unknown.Valve Now Locked open.W/840321 Ltr1984-03-21021 March 1984 Updated LER 83-122/01X-1:on 830908,valve P64F467 Which Supplies Operating Pressure to CO2 Fire Protection Master Selector Valve Found Closed.Cause Unknown.Valve Now Locked open.W/840321 Ltr 05000416/LER-1983-171, Updated LER 83-171/03X-1:on 831028,fuel Oil Leak & Broken Connector Pushrod Discovered.Caused by Crack in Oil Tubing & Difficulty in Welding Pushrod.Tubing & Pushrod Replaced. W/840316 Ltr1984-03-16016 March 1984 Updated LER 83-171/03X-1:on 831028,fuel Oil Leak & Broken Connector Pushrod Discovered.Caused by Crack in Oil Tubing & Difficulty in Welding Pushrod.Tubing & Pushrod Replaced. W/840316 Ltr 05000416/LER-1983-189, Updated LER 83-189/03X-1:on 831207 & 840201,breaker 152-1704 to Div 3 ESF Bus Tripped.Caused by Broken Current Limiter Resistor Socket for Breaker Position Indicating Light. Agastat Relay 7012 Replaced1984-03-12012 March 1984 Updated LER 83-189/03X-1:on 831207 & 840201,breaker 152-1704 to Div 3 ESF Bus Tripped.Caused by Broken Current Limiter Resistor Socket for Breaker Position Indicating Light. Agastat Relay 7012 Replaced 05000416/LER-1983-126, Updated LER 83-126/01X-1:on 830904,Div 1 Diesel Generator Fuel Line Ruptured,Causing Fire Near Left Bank Turbocharger. Caused by Fatigue Crack Propagation.Fuel Line Support Added to Div 1 & 2 Diesel generators.W/840308 Ltr1984-03-0808 March 1984 Updated LER 83-126/01X-1:on 830904,Div 1 Diesel Generator Fuel Line Ruptured,Causing Fire Near Left Bank Turbocharger. Caused by Fatigue Crack Propagation.Fuel Line Support Added to Div 1 & 2 Diesel generators.W/840308 Ltr 05000416/LER-1983-179, Updated LER 83-179/03X-1:on 831105,Div II Diesel Generator Shut Down Upon Discovery of Fuel Oil Return Line Leak.After Repair During Restart,Generator Tripped Due to Isolation of Fuel Supply Valve F016B.W/840308 Ltr1984-03-0808 March 1984 Updated LER 83-179/03X-1:on 831105,Div II Diesel Generator Shut Down Upon Discovery of Fuel Oil Return Line Leak.After Repair During Restart,Generator Tripped Due to Isolation of Fuel Supply Valve F016B.W/840308 Ltr 05000416/LER-1983-185, Updated LER 83-185/03X-1:on 831201,while in Cold Shutdown, Breaker 552-2105 Tripped,Causing Loss of Power to Div 1 ESF Bus & All Balance of Plant Loads.Caused by Two Shorted Wires in Breaker Hand Switch.Wires altered.W/840302 L1984-03-0202 March 1984 Updated LER 83-185/03X-1:on 831201,while in Cold Shutdown, Breaker 552-2105 Tripped,Causing Loss of Power to Div 1 ESF Bus & All Balance of Plant Loads.Caused by Two Shorted Wires in Breaker Hand Switch.Wires altered.W/840302 Ltr 05000416/LER-1983-156, Updated LER 83-156/03X-1:on 831003,capscrew Securing Starting Air Manifold to Support Plate on Left Bank Cylinder 8 Found Broken Inside Plate.Cause Undetermined.Capscrew replaced.W/840302 Ltr1984-03-0202 March 1984 Updated LER 83-156/03X-1:on 831003,capscrew Securing Starting Air Manifold to Support Plate on Left Bank Cylinder 8 Found Broken Inside Plate.Cause Undetermined.Capscrew replaced.W/840302 Ltr 05000416/LER-1983-181, Updated LER 83-181/03X-1:on 831110,channel C as-found Setpoints for Undervoltage Trip Were 116.2-volt Ac.Cause Unknown.Voltage Adjusted within Desired range.W/840221 Ltr1984-02-21021 February 1984 Updated LER 83-181/03X-1:on 831110,channel C as-found Setpoints for Undervoltage Trip Were 116.2-volt Ac.Cause Unknown.Voltage Adjusted within Desired range.W/840221 Ltr 05000416/LER-1983-180, Updated LER 83-180/03X-1:on 831107,drywell Floor Drain Sump Level & Flow Monitoring Leak Detection Sys Discovered Inoperable.Cause Undetermined.Sys Monitored for 2 Wks W/O Repeating problem.W/840217 Ltr1984-02-17017 February 1984 Updated LER 83-180/03X-1:on 831107,drywell Floor Drain Sump Level & Flow Monitoring Leak Detection Sys Discovered Inoperable.Cause Undetermined.Sys Monitored for 2 Wks W/O Repeating problem.W/840217 Ltr 05000416/LER-1983-109, Updated LER 83-109/03X-2:on 830727,spurious RHR Room High Area Temp or Delta Temp Signal Caused Inboard Shutdown Cooling Valve F009 Closure.Caused by Loose Plug Connection on Riley Temp switch.W/840214 Ltr1984-02-14014 February 1984 Updated LER 83-109/03X-2:on 830727,spurious RHR Room High Area Temp or Delta Temp Signal Caused Inboard Shutdown Cooling Valve F009 Closure.Caused by Loose Plug Connection on Riley Temp switch.W/840214 Ltr 05000416/LER-1983-177, Updated LER 83-177/03X-1:on 831029,1102 & 06,water Collected in Offgas Pretreatment Monitor,Resulting in Improper Flow Through Monitor.Caused by Accumulation of Condensation.Heat Tracing Installed on piping.W/840213 Ltr1984-02-13013 February 1984 Updated LER 83-177/03X-1:on 831029,1102 & 06,water Collected in Offgas Pretreatment Monitor,Resulting in Improper Flow Through Monitor.Caused by Accumulation of Condensation.Heat Tracing Installed on piping.W/840213 Ltr 05000416/LER-1983-128, Updated LER 83-128/01X-1:on 830912 During Routine Maint,Two fire-rated Penetrations Found Unsealed.Caused by Procedural Inadequacy.Penetrations Resealed1983-12-0606 December 1983 Updated LER 83-128/01X-1:on 830912 During Routine Maint,Two fire-rated Penetrations Found Unsealed.Caused by Procedural Inadequacy.Penetrations Resealed 05000416/LER-1983-115, Updated LER 83-115/03X-1:on 830803 & 04,RHR Pump a Failed to Start.Div I Busses Incorrectly Shown Tripped,Annunciator Panels Came On,Optical Isolator Failed & Breakers Tripped. Caused by Incorrectly Terminated Cable1983-11-0303 November 1983 Updated LER 83-115/03X-1:on 830803 & 04,RHR Pump a Failed to Start.Div I Busses Incorrectly Shown Tripped,Annunciator Panels Came On,Optical Isolator Failed & Breakers Tripped. Caused by Incorrectly Terminated Cable 05000416/LER-1983-011, Updated LER 83-011/99X-2:on 830103-24,fire-rated Barriers in Control & Auxiliary Bldgs Opened to Perform Planned Maint.Fire Watches Established.All Fire Barriers Restored1983-09-0808 September 1983 Updated LER 83-011/99X-2:on 830103-24,fire-rated Barriers in Control & Auxiliary Bldgs Opened to Perform Planned Maint.Fire Watches Established.All Fire Barriers Restored 05000416/LER-1983-021, Updated LER 83-021/01T-1:on 830519,determined That Standby Gas Treatment Sys Flow Monitoring Instrumentation Reading in Error.Caused by Incorrect Calibr Range Based on Postulated Instead of Std Conditions.Instruments Recalibr1983-07-18018 July 1983 Updated LER 83-021/01T-1:on 830519,determined That Standby Gas Treatment Sys Flow Monitoring Instrumentation Reading in Error.Caused by Incorrect Calibr Range Based on Postulated Instead of Std Conditions.Instruments Recalibr 05000416/LER-1982-172, Update 2 to LER 82-172/99X-2:on 821210,penetration AE154C in Auxiliary Bldg Opened.Caused by Planned Maint Activity. Hourly Fire Watch Established.Penetration to Be Resealed by 8309101983-07-12012 July 1983 Update 2 to LER 82-172/99X-2:on 821210,penetration AE154C in Auxiliary Bldg Opened.Caused by Planned Maint Activity. Hourly Fire Watch Established.Penetration to Be Resealed by 830910 05000416/LER-1982-180, Final LER 82-180/03L-0:on 821227,isolation Valve for Hose Station in Control Room Replaced Due to Leaking Which Pressurized Hose.Addl Hose Run to Supply Backup Fire Protection.Leaking Valve Replaced.Sys Returned to Svc1983-01-25025 January 1983 Final LER 82-180/03L-0:on 821227,isolation Valve for Hose Station in Control Room Replaced Due to Leaking Which Pressurized Hose.Addl Hose Run to Supply Backup Fire Protection.Leaking Valve Replaced.Sys Returned to Svc 05000416/LER-1982-132, /01T-0:on 830110 Discovered That Control Room Floor Penetration Open Since 821213.Caused by Performance of Planned Maint Work.Incident Noticed While Implementing Corrective Actions to LER 82-132/01T-01983-01-24024 January 1983 /01T-0:on 830110 Discovered That Control Room Floor Penetration Open Since 821213.Caused by Performance of Planned Maint Work.Incident Noticed While Implementing Corrective Actions to LER 82-132/01T-0 05000416/LER-1982-138, Interim LER 82-138/99X-0:on 821112,during Shutdown,Several Duct Covers Could Not Be Installed Due to Cables Extending Through Ducts.Caused by Faulty Design Document.Engineering Evaluation Underway1982-12-16016 December 1982 Interim LER 82-138/99X-0:on 821112,during Shutdown,Several Duct Covers Could Not Be Installed Due to Cables Extending Through Ducts.Caused by Faulty Design Document.Engineering Evaluation Underway 05000416/LER-1982-031, Interim LER 82-031/99X-1:on 820722,HVAC Penetration Seal CV-19G Found Not Installed During Insp.Caused by Const Oversight.Maint Work Order Released to Install Seal & Hourly Fire Watch Established Until Task Completed1982-12-15015 December 1982 Interim LER 82-031/99X-1:on 820722,HVAC Penetration Seal CV-19G Found Not Installed During Insp.Caused by Const Oversight.Maint Work Order Released to Install Seal & Hourly Fire Watch Established Until Task Completed 1993-08-26
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20217F9921999-09-30030 September 1999 Monthly Operating Rept for Sept 1999 for Grand Gulf Nuclear Station,Unit 1.With ML20212F5641999-09-23023 September 1999 SER Concluding That All of ampacity-related Concerns Have Been Resolved & Licensee Provided Adequate Technical Basis to Assure That All of Thermo-Lag Fire Barrier Encl Cables Operating within Acceptable Ampacity Limits ML20211Q3171999-09-0909 September 1999 Safety Evaluation Accepting BWROG Rept, Prediction of Onset of Fission Gas Release from Fuel in Generic BWR, Dtd July 1996 ML20216E4881999-08-31031 August 1999 Monthly Operating Rept for Aug 1999 for Grand Gulf Nuclear Station.With ML20211A6921999-07-31031 July 1999 Monthly Operating Rept for July 1999 for Grand Gulf Nuclear Station,Unit 1.With ML20209J1961999-07-12012 July 1999 Special Rept 99-001:on 990528,smoke Detectors Failed to Alarm During Performance of Routine Channel Functional Testing.Applicable TRM Interim Compensatory Measure of Establishing Roving Hourly Fire Patrol Was Implemented ML20196K4981999-07-0101 July 1999 Safety Evaluation Authorizing PRR-E12-01,PRR-E21-01, PRR-P75-01,PRR-P81-01,VRR-B21-01,VRR-B21-02,VRR-E38-01 & VRR-E51-01.Concludes That Alternatives Proposed by EOI Acceptable ML20209G0691999-06-30030 June 1999 Monthly Operating Rept for June 1999 for Grand Gulf Nuclear Station,Unit 1.With ML20196A1161999-05-31031 May 1999 Monthly Operating Rept for May 1999 for Grand Gulf Nuclear Station.With ML20206Q4831999-04-30030 April 1999 Monthly Operating Rept for Apr 1999 for Grand Gulf Nuclear Station Unit 1.With ML20206J1201999-04-30030 April 1999 Redacted ME-98-001-00, Pressure Locking & Thermal Binding Test Program on Two Gate Valves with Limitorque Actuators ML18016A9011999-04-12012 April 1999 Part 21 Rept Re Defect in Component of DSRV-16-4,Enterprise DG Sys.Caused by Potential Problem with Connecting Rod Assemblies Built Since 1986,that Have Been Converted to Use Prestressed Fasteners.Affected Rods Should Be Inspected ML20205P8771999-03-31031 March 1999 Monthly Operating Rept for Mar 1999 for Grand Gulf Nuclear Station,Unit 1.With ML20207M9231999-03-12012 March 1999 Amended Part 21 Rept Re Cooper-Bessemer Ksv EDG Power Piston Failure.Total of 198 or More Pistons Have Been Measured at Seven Different Sites.All Potentially Defective Pistons Have Been Removed from Svc Based on Encl Results ML20207K5141999-02-28028 February 1999 Monthly Operating Rept for Feb 1999 for Grand Gulf Nuclear Station,Unit 1.With ML20206T7991999-01-31031 January 1999 Iodine Revolatizitation in Grand Gulf Loca ML20207A8301998-12-31031 December 1998 1998 Annual Operating Rept for Ggns,Unit 1 ML20206R9501998-12-31031 December 1998 Monthly Operating Rept for Dec 1998 for Grand Gulf Nuclear Station,Unit 1.With ML20206D7721998-12-31031 December 1998 South Mississippi Electric Power Association 1998 Annual Rept ML20198E2481998-11-30030 November 1998 Monthly Operating Rept for Nov 1998 for Grand Gulf Nuclear Station,Unit 1.With ML20195F4121998-11-13013 November 1998 Rev 16 to GGNS-TOP-1A, Operational QA Manual (Oqam) ML20195C4841998-11-0606 November 1998 SER Accepting QA Program Change to Consolidate Four Existing QA Programs for Arkansas Nuclear One,Grand Gulf Nuclear Station,River Bend Station & Waterford 3 Steam Electric Station Into Single QA Program ML20195C2791998-11-0505 November 1998 BWR Feedwater Nozzle Inservice Insp Summary Rept for GGNS, NUREG-0619-00006 ML20195F4801998-10-31031 October 1998 Monthly Operating Rept for Oct 1998 for Grand Gulf Nuclear Station,Unit 1.With ML20155C1351998-10-26026 October 1998 Rev B to Entergy QA Program Manual ML20154K2391998-09-30030 September 1998 Monthly Operating Rept for Sept 1998 for Grand Gulf Nuclear Station Unit 1.With ML20155F1961998-09-0101 September 1998 Engineering Rept for Evaluation of BWR CR Drive Mounting Flange Cap Screw ML20153B2161998-08-31031 August 1998 Monthly Operating Rept for Aug 1998 for Grand Gulf Nuclear Station,Unit 1.With ML20237B6661998-07-31031 July 1998 Monthly Operating Rept for Jul 1998 for Grand Gulf Nuclear Station,Unit 1 ML20236R0231998-06-30030 June 1998 Monthly Operating Rept for June 1998 for Grand Gulf Nuclear Station,Unit 1 ML20155J0811998-05-31031 May 1998 10CFR50.59 SE for Period Jan 1997 - May 1998 ML20249B1251998-05-31031 May 1998 Monthly Operating Rept for May 1998 for Grand Gulf Nuclear Station,Unit 1 ML20248B6261998-05-11011 May 1998 Rev 6 to Grand Gulf Nuclear Station COLR Safety-Related ML20217Q6701998-05-0606 May 1998 SER Approving Proposed Postponement of Beginning Augmented Exam Requirements of 10CFR50.55a(g)(6)(ii)(A)(2) at Grand Gulf for Circumferential Shell Welds for Two Operating Cycles ML20206J1271998-04-30030 April 1998 Pressure Locking Thrust Evaluation Methodology for Flexible Wedge Gate Valves ML20247F3591998-04-30030 April 1998 Monthly Operating Rept for Apr 1998 for Grand Gulf Nuclear Plant,Unit 1 ML20217M8951998-04-30030 April 1998 QA Program Manual ML20217P8281998-04-0707 April 1998 Safety Evaluation Accepting Relief Authorization for Alternative to Requirements of ASME Section Xi,Subarticle IWA-5250 Bolting Exam for Plants,Per 10CFR50.55a(a)(3)(i) ML20217P0381998-04-0606 April 1998 Safety Evaluation Supporting Amend 135 to License NPF-29 ML20217A0291998-03-31031 March 1998 Monthly Operating Rept for Mar 1998 for Grand Gulf Nuclear Sation,Unit 1 ML20216J4211998-03-18018 March 1998 SER Approving Alternative to Insp of Reactor Pressure Vessel Circumferential Welds for Grand Gulf Nuclear Station ML20216J2021998-02-28028 February 1998 Monthly Operating Rept for Feb 1998 for Grand Gulf Nuclear Station,Unit 1 ML20203A2891998-01-31031 January 1998 Monthly Operating Rept for Jan 1998 for Grand Gulf Nuclear Station ML20247B4111997-12-31031 December 1997 1997 Annual Financial Rept for South Mississippi Electric Power Association ML20203H9741997-12-31031 December 1997 1997 Annual Operating Rept, for Ggns,Unit 1 ML20198P1121997-12-31031 December 1997 Monthly Operating Rept for Dec 1997 for Grand Gulf Nuclear Station,Unit 1 ML20203B5581997-12-0404 December 1997 Special Rept 97-003:on 971111,valid Failure of Div 2 EDG Occurred,Due to Jacket Water Leak.Failure Reported,Per Plant Technical Requirements Manual Section 7.7.2.2 ML20203K4031997-11-30030 November 1997 Monthly Operating Rept for Nov 1997 for Grand Gulf Nuclear Station,Unit 1 ML20199H3711997-11-19019 November 1997 SER Accepting Approving Request Relief from Requirements of Section XI, Rule for Inservice Insp of NPP Components, of ASME for Current or New 10-year Inservice Insp Interval IAW 50.55(a)(3)(i) of 10CFR50 ML20199F3431997-11-18018 November 1997 SER Accepting Rev 15 of Operational Quality Assurance Manual for Grand Gulf Nuclear Station,Unit 1 1999-09-09
[Table view] |
LER-2083-107, Updated LER 83-107/03X-2:on 830726,during Test,Mounting Bolts for Div 1 Diesel Generator Turbocharger Found Loose or Broken & Associated Parts & Welds Cracked.Caused by Misaligned Turbocharger.Longer Bolts installed.W/840327 Ltr |
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Update Report - Previous Report Date 10/24/83 N""NFV
. . ME EWERIT MNRT Attachment to AECM-84/0169 Page 1 of 3 i
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EWGNT DASCRIPTtoII afeD PROSa8LE CONSEQUENCES h E lan 7/2&/B3. durino a test. the mountino bolts for a Div. I D/G turbo- l ra s s tcharger were found to be either loose or broken. During.this and j E l subsequent tests and inspections, associated parts and welds were !
Q idiscovered cracked or broken. The requirewents of T.S. 3.8.1.2 were met.l u o IThe event had no effect on the health and safety of the public nor was l 8 lthere a threat to plant safety.__This is reported pursuant tc T.S. _ l
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cama esecmaTKwano CORRECTIVE ACTIONS go] (The f ailures of the bolts are attributed to turbocharger misalignment. I g] lThe cracked components were due to turbocharger vibration af ter the i
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, [ remount 1; realign the turbocharger.During subsequent tests, bolts on thej g @B turbocharger failed again .2ae to the alignment problem (SR 84-007). 1
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NAME OF PMEFARER R. W. Eyrd PHOME:
Attachment to I AECM-84/0169 Page 2 of 3 Supplementary Information to LER 83-107/03 X-2 Misnissippi Power & Light Company Grand Gulf Nuclear Station - Unit 1 Docket No. 50-416 Technical Specification Involved: 4.8.1.1.3 Reported Under Technical Specification: 6.9.1.13.b Event Narrative On July 26, 1983, during a routine visual inspection 92 minutes into a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> surveillance test run of the Division I Diesel Generator, the bolts that hold the lef t bank turbocharger to its support or mounting plate were discovered to be either loose or broken. Four 5/18-11x2" SAE grade 5 capscrew bolts are used to mount the turbocharger. Two of the four bolts for the LB turbocharger >
were broken and the others were loose. One of the bolts had sheared off and the broken part remained in the LB turbocharger housing. All of the bolts, except the one sheared off, were replaced and torqued to 60 ft-lbs. No other damage was apparent.
As a precaution, the Division Il Diesel Generator turbocharger bolts were inspected. Two bolts were found loose, one on each turbocharger; in addition, two bolts on the LB turbocharger were not of the type specified by the manufacturer. The incorrect bolts were replaced and all the bolts werc _ ..
torqued to 60 ft-lbs.
On July 27, 1983, the Division I Diesel Generator was 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> into a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> surveillance test run when mounting bolts on the turbocharger were again inspected and found to be either loose or broken. The Diesel Generator was .
manually shutdown for repairs. Subsequent inspections and tests, including ~
short maintenance runs, over the next 3 weeks revealed the following:
- 1. cracked welds in the RB and LB intercooler adapters which are between the intercoolers and turbochargers,
- 2. a base metal crack (1" long) in the LB intercooler,
- 3. a through wall crack in the weld between the RB turbocharger and the cooling water discharge piping,
- 4. A through wall crack in the veld between the LB turbocharger and the cooling water discharge piping, and
- 5. two broken mounting bolts in the LB turbocharger.
The cracked welds were weld repaired. The LB turbocharger was replaced and the mounting bolts were changed from 5/8"-11x2" SAE grade 5 capscrew bolts to 1 5/8"-11x2h" SAE grade 3 capscrew bolts. Flat washers were added under the existing lock washers. The turbocharger vas realigned to eliminate an air gap between it and the mounting base.
.l
- s"
-The micalignneat is believed to be the root cause of the bolt failures. The bolt failures allowed relative movement between the turbocharger and its e
mounting base plate; the resulting vibration caused fatigue cracking in the attached piping and intercooler adapters. All; applicable corrective actions have also been performed on the' Division II Diesel Generator.
A spot check radiography of 10 butt welds at random locations on the jacket water lube oil, and starting air systems was performed on the Division I Diesel Generator. One weld which did not meet acceptance criteria, was weld repaired.
t On August 21, 1983, the Division I Diesel Genecator completed a successful 40 hour4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> maintenance run with no problems. It was restarted 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> later to begin a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> surveillance test. Approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> later, a second
'thru wall crack developed in the weld between the LB turbocharger and the cooling water discharge piping. This was weld repaired and is attributable to the conditions generated by the original turbocharger bolt problem._ The torque.was. checked on all of the turbocharger mounting bolts after 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> of operation'since che bolt change and there was no decrease in five bolts and no appreciable change in the other three.
On August 30, 1983 (Reference LER 83-136/03 X-2), a base metal crack vas discovered in the LB turbocharger intercooler adapter 98 minutes into : 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. surveillance test. The crack was weld repaired. This event was also <
attributed to the conditions generated by the original bolt problem.
A design change vari initiated to replace all of the coolant piping associated with'the turbochargers. This waL. performed during the diesel repairs as a result _of the fuel oil fire of September 4, 1983 (Reference LER 83-126/01 T-0). In addition, all equipment alignments associated wita the turbocharger were checked and corrected as necessary.
During subsequent . tests on January 31 ~and February 10, 1984, bolts again failed on the Division I Diesel Generator LB turbocharget (reported in Special Report 84-007/0). The failures ~ on January 31 and 1%bruary 10 were again attributed to misalignment of the turbocharger. A Maintenance Work Order (MWO) utilizing Special Instructions. designed to preclude misalignment was
'impicmented ,The alignment is now corrected.
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P MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. BOX 1640 J ACKSON MISSISSlPPI 39205 84 mR 2 March A!0 :27,0 0
1984 NUCLEAR PRODUCTION DEPARTMENT U.S. Nuclear Regulatory Commission Region 11 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator
Dear Mr. O'Reilly:
SUBJECT:
Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-13 File: 0260/L-835.0 Update Report - Mounting Bolts on Division I Diesel Generator Turbocharger Found Loose or Broken LER 83-107/03 X-2 AECM-84/0169 This letter submits an update to previous reports submitted on August 26, 1983 and October 24, 1983. The event for which the report was submitted occurred on July 26, 1983, when during a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test run some of the mounting bolts for a Division I Diesel Generator turbocharger were found to be either loose or broken. During subsequent tests and inspections, cracked welds wue found on the intereccler adapter between the intercooler and turbocharger bnd in the cooling water outlet piping. The diesel generator had been loaded to greater than 50% for longer than I hour, therefore, this was considered a valid successful test pursuant to Regulatory Position C.2.e.(3) of Regulatory Guide 1.108. This was reported pursuant to Technical Specification 6.9.1.13.b.
Our investigation into the cause of the event and corrective action to prevent recurrence is complete. This is a final report. Attached is LEP 83-107/03 X-2 with Supplementary Information.
Yours truly, L. F. Dale Manager of Nuclear Services EBS/SHE:rg Attachment ec: See next page CIAl capf';
1E cc Member Middle South Utilities System yy
o .
.AECM-84/0169-
' ap 2 gj MISSISSIPPI POWER O Ll2HT COMPANY s ?' "' -,
cc: 'Mr. J. B.-Richard'(w/a)-
Mr. R. B. McGehee (w/o)-
Mr. T. B. Conner (w/o)
Mr..G. B. Taylor (w/o)
^;
Mr. Richard C. DeYoung, Director (w/a)
_ T" Office of Inspection & Enforcement '
U. S. Nuclear Regulatory Commission .
' Washington .D. C. 20555 r:
Document. Control Desk (w/a)
U. S. Nuclear Regulatory Commission I
Washington, D. C. 20555 f a
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05000416/LER-1983-001, Forwards LER 83-001/01T-0 | Forwards LER 83-001/01T-0 | | 05000416/LER-1983-002, Forwards LER 83-002/01T-0 | Forwards LER 83-002/01T-0 | | 05000416/LER-1983-003, Forwards LER 83-003/01T-0 | Forwards LER 83-003/01T-0 | | 05000416/LER-1983-004, Forwards LER 83-004/01T-0 | Forwards LER 83-004/01T-0 | | 05000416/LER-1983-005, Forwards LER 83-005/03L-0 | Forwards LER 83-005/03L-0 | | 05000416/LER-1983-006, Forwards LER 83-006/03L-0 | Forwards LER 83-006/03L-0 | | 05000416/LER-1983-007, Forwards LER 83-007/03L-0 | Forwards LER 83-007/03L-0 | | 05000416/LER-1983-008, Forwards LER 83-008/99X-0 | Forwards LER 83-008/99X-0 | | 05000416/LER-1983-009, Forwards LER 83-009/03L-0 | Forwards LER 83-009/03L-0 | | 05000416/LER-1983-010, Forwards LER 83-010/99X-0 | Forwards LER 83-010/99X-0 | | 05000416/LER-1983-011, Updated LER 83-011/99X-2:on 830103-24,fire-rated Barriers in Control & Auxiliary Bldgs Opened to Perform Planned Maint.Fire Watches Established.All Fire Barriers Restored | Updated LER 83-011/99X-2:on 830103-24,fire-rated Barriers in Control & Auxiliary Bldgs Opened to Perform Planned Maint.Fire Watches Established.All Fire Barriers Restored | | 05000416/LER-1983-012, Forwards LER 83-012/03L-0 | Forwards LER 83-012/03L-0 | | 05000416/LER-1983-013, Forwards LER 83-013/99X-0 | Forwards LER 83-013/99X-0 | | 05000416/LER-1983-014, Forwards LER 83-014/03L-0 | Forwards LER 83-014/03L-0 | | 05000416/LER-1983-015, Forwards LER 83-015/03L-0 | Forwards LER 83-015/03L-0 | | 05000416/LER-1983-016, Forwards LER 83-016/03L-0 | Forwards LER 83-016/03L-0 | | 05000416/LER-1983-017, Forwards LER 83-017/03L-0 | Forwards LER 83-017/03L-0 | | 05000416/LER-1983-018, Forwards LER 83-018/99X-0 | Forwards LER 83-018/99X-0 | | 05000416/LER-1983-020, Forwards LER 83-020/03L-0 | Forwards LER 83-020/03L-0 | | 05000416/LER-1983-021, Updated LER 83-021/01T-1:on 830519,determined That Standby Gas Treatment Sys Flow Monitoring Instrumentation Reading in Error.Caused by Incorrect Calibr Range Based on Postulated Instead of Std Conditions.Instruments Recalibr | Updated LER 83-021/01T-1:on 830519,determined That Standby Gas Treatment Sys Flow Monitoring Instrumentation Reading in Error.Caused by Incorrect Calibr Range Based on Postulated Instead of Std Conditions.Instruments Recalibr | | 05000416/LER-1983-022, Forwards LER 83-022/03L-0 | Forwards LER 83-022/03L-0 | | 05000416/LER-1983-023, Forwards LER 83-023/03L-0 | Forwards LER 83-023/03L-0 | | 05000416/LER-1983-024, Forwards LER 83-024/03L-0 | Forwards LER 83-024/03L-0 | | 05000416/LER-1983-025, Forwards LER 83-025/03L-0 | Forwards LER 83-025/03L-0 | | 05000416/LER-1983-026, Forwards LER 83-026/03L-0 | Forwards LER 83-026/03L-0 | | 05000416/LER-1983-027, Forwards LER 83-027/99X-0 | Forwards LER 83-027/99X-0 | | 05000416/LER-1983-028, Forwards LER 83-028/03L-0 | Forwards LER 83-028/03L-0 | | 05000416/LER-1983-029, Forwards LER 83-029/03L-0 | Forwards LER 83-029/03L-0 | | 05000416/LER-1983-030, Forwards LER 83-030/99X-0 | Forwards LER 83-030/99X-0 | | 05000416/LER-1983-031, Forwards LER 83-031/99X-0 | Forwards LER 83-031/99X-0 | | 05000416/LER-1983-032, Forwards LER 83-032/03L-0 | Forwards LER 83-032/03L-0 | | 05000416/LER-1983-033, Forwards LER 83-033/99X-0 | Forwards LER 83-033/99X-0 | | 05000416/LER-1983-034, Forwards LER 83-034/03L-0 | Forwards LER 83-034/03L-0 | | 05000416/LER-1983-035, Forwards LER 83-035/01T-0 | Forwards LER 83-035/01T-0 | | 05000416/LER-1983-036, Forwards LER 83-036/03L-0 | Forwards LER 83-036/03L-0 | | 05000416/LER-1983-037, Forwards LER 83-037/03L-0 | Forwards LER 83-037/03L-0 | | 05000416/LER-1983-038, Forwards LER 83-038/03L-0 | Forwards LER 83-038/03L-0 | | 05000416/LER-1983-039, Forwards LER 83-039/99X-0 | Forwards LER 83-039/99X-0 | | 05000416/LER-1983-040, Forwards LER 83-040/03L-0 | Forwards LER 83-040/03L-0 | | 05000416/LER-1983-041, Forwards LER 83-041/03L-0 | Forwards LER 83-041/03L-0 | | 05000416/LER-1983-042, Forwards LER 83-042/99X-0 | Forwards LER 83-042/99X-0 | | 05000416/LER-1983-043, Forwards LER 83-043/03L-0 | Forwards LER 83-043/03L-0 | | 05000416/LER-1983-044, Forwards LER 83-044/99X-0 | Forwards LER 83-044/99X-0 | | 05000416/LER-1983-045, Forwards LER 83-045/99X-0 | Forwards LER 83-045/99X-0 | | 05000416/LER-1983-047, Forwards LER 83-047/03L-0 | Forwards LER 83-047/03L-0 | | 05000416/LER-1983-050, Forwards LER 83-050/03L-0 | Forwards LER 83-050/03L-0 | | 05000416/LER-1983-051, Forwards LER 83-051/03L-0 | Forwards LER 83-051/03L-0 | | 05000416/LER-1983-053, Forwards LER 83-053/99X-0 | Forwards LER 83-053/99X-0 | | 05000416/LER-1983-054, Forwards LER 83-054/03L-0 | Forwards LER 83-054/03L-0 | | 05000416/LER-1983-055, Forwards LER 83-055/03L-0 | Forwards LER 83-055/03L-0 | |
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