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Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARNOC-AE-000304, Special Rept Re Evaluation of Units 1 & 2 Containment Tendon Conditions.Grease Voids Were in Excess of 5% in Two Tendons. Voids of 20% or Less Are Considered Reasonable.Containment Integrity Assured1998-09-24024 September 1998 Special Rept Re Evaluation of Units 1 & 2 Containment Tendon Conditions.Grease Voids Were in Excess of 5% in Two Tendons. Voids of 20% or Less Are Considered Reasonable.Containment Integrity Assured NOC-AE-000250, Special Rept:Discovered That Tendon Filler Grease Voids in Excess of SR Max of 5% of Net Duct Vol Existed.Caused by Shrinkage of Grease & Spaces Existing Between Wires in Tendon Wires.Installed Grease Throughout Tendon Ducts1998-08-12012 August 1998 Special Rept:Discovered That Tendon Filler Grease Voids in Excess of SR Max of 5% of Net Duct Vol Existed.Caused by Shrinkage of Grease & Spaces Existing Between Wires in Tendon Wires.Installed Grease Throughout Tendon Ducts NOC-AE-000222, Special Rept:On 980614,nonvalid Failure of Standby Diesel Generator Occurred.Caused by Inadequate Procedure.Failed Potential Transformer Was replaced,B-train 4.16 Kv ESF Switchgear Was Reenergized & Procedure Was Revised1998-07-0909 July 1998 Special Rept:On 980614,nonvalid Failure of Standby Diesel Generator Occurred.Caused by Inadequate Procedure.Failed Potential Transformer Was replaced,B-train 4.16 Kv ESF Switchgear Was Reenergized & Procedure Was Revised NOC-AE-000143, Special Rept:On 980413,declared Primary Meteorological Tower Instrumentation Inoperable Due to Performance of semi-annual Sys Calibr Required by TS 3.3.3.4.Successfully Calibr & Returned Primary Meterological Tower Instruments to Svc1998-04-29029 April 1998 Special Rept:On 980413,declared Primary Meteorological Tower Instrumentation Inoperable Due to Performance of semi-annual Sys Calibr Required by TS 3.3.3.4.Successfully Calibr & Returned Primary Meterological Tower Instruments to Svc NOC-AE-000119, Special Rept:On 980307 & 10,non-valid Failures of Standby Generator 13 Occurred.Caused by out-of-calibration Reverse Power Relay Inadequate Work Procedures Used to Calibrate Relay.Procedures Revised1998-04-0606 April 1998 Special Rept:On 980307 & 10,non-valid Failures of Standby Generator 13 Occurred.Caused by out-of-calibration Reverse Power Relay Inadequate Work Procedures Used to Calibrate Relay.Procedures Revised NOC-AE-000036, Special Rept:On 971111,valid Failure of Sdg 21 Occurred. Caused by Failed Governor Speed Setting Potentiometer.Sdg 21 Governor Speed Setting Potentiometer Replaced1997-12-11011 December 1997 Special Rept:On 971111,valid Failure of Sdg 21 Occurred. Caused by Failed Governor Speed Setting Potentiometer.Sdg 21 Governor Speed Setting Potentiometer Replaced ST-HL-AE-5738, Special Rept:On 970821,declared Standby DG 21 Inoperable to Allow Repairs.Fuel Rack Sys Set of Rotating Shafts & Lever Arms Connecting Engine Governor to Individual Cylinder Fuel Injection Pumps.Binding Ball Joint Replaced1997-09-0909 September 1997 Special Rept:On 970821,declared Standby DG 21 Inoperable to Allow Repairs.Fuel Rack Sys Set of Rotating Shafts & Lever Arms Connecting Engine Governor to Individual Cylinder Fuel Injection Pumps.Binding Ball Joint Replaced ST-HL-AE-5620, Special Rept:On 970312,declared Standby Diesel Generator 13 Inoperable.Caused by Inoperative Reset Coil on K1 Relay. Reinstalled Original K1 Relay in Standby Diesel Generator 13 & Tested Satisfactorily & Sent Failed K1 Relay to Vendor1997-04-0909 April 1997 Special Rept:On 970312,declared Standby Diesel Generator 13 Inoperable.Caused by Inoperative Reset Coil on K1 Relay. Reinstalled Original K1 Relay in Standby Diesel Generator 13 & Tested Satisfactorily & Sent Failed K1 Relay to Vendor ST-HL-AE-5538, Special Rept on 961204,nonvalid Failure of Sdg 11 Occurred. Caused by Lack of Knowledge of Indications Available to Verify Sdg Output Breaker Completely Rack In.Training Bulletin Was Issued to Operations Personnel1996-12-31031 December 1996 Special Rept on 961204,nonvalid Failure of Sdg 11 Occurred. Caused by Lack of Knowledge of Indications Available to Verify Sdg Output Breaker Completely Rack In.Training Bulletin Was Issued to Operations Personnel ST-HL-AE-5432, Special Rept:On 951204,one of Channels in Upper Rv Collection Region Was Declared Inoperable Due to Loss of Sensor Signal.Repair of Two Channels Will Be Performed During Next Unit 2 Refueling1996-07-22022 July 1996 Special Rept:On 951204,one of Channels in Upper Rv Collection Region Was Declared Inoperable Due to Loss of Sensor Signal.Repair of Two Channels Will Be Performed During Next Unit 2 Refueling ST-HL-AE-5393, Special Rept:On 960130,standby DG 11 Valid Failure Caused by Failed op-amp IC Chip on Preposition Board.Voltage Regulator & Preposition Board Replaced1996-06-0606 June 1996 Special Rept:On 960130,standby DG 11 Valid Failure Caused by Failed op-amp IC Chip on Preposition Board.Voltage Regulator & Preposition Board Replaced ST-HL-AE-5310, Special Rept:On 960130,voltage for Sdg Increased to 4600 Vac Exceeding Expected Emergency Mode Setting of 4160 Vac. Caused by Faulty Instantaneous Preposition Board.Sent Failed Voltage Regulator & Preposition Board Offsite for Analysis1996-02-29029 February 1996 Special Rept:On 960130,voltage for Sdg Increased to 4600 Vac Exceeding Expected Emergency Mode Setting of 4160 Vac. Caused by Faulty Instantaneous Preposition Board.Sent Failed Voltage Regulator & Preposition Board Offsite for Analysis ST-HL-AE-5227, Special Rept:On 951022,completed ISI of Unit 2 Sg.Tube Plugs Visually Inspected for Evidence of Leakage.Welded Plugs Installed at Locations1995-11-0202 November 1995 Special Rept:On 951022,completed ISI of Unit 2 Sg.Tube Plugs Visually Inspected for Evidence of Leakage.Welded Plugs Installed at Locations ST-HL-AE-5182, Special Rept:On 950823,valid Failure of Sdg 12 Occurred Due to Misalignment of Reset Coil Contacts Resulting in Intermittent Failure of K1 relay.K1 Relay in Sdg 12 Replaced1995-09-21021 September 1995 Special Rept:On 950823,valid Failure of Sdg 12 Occurred Due to Misalignment of Reset Coil Contacts Resulting in Intermittent Failure of K1 relay.K1 Relay in Sdg 12 Replaced ST-HL-AE-5064, Special Rept:On 950401,thirty-two SG Tubes Containing Circumferential Indications & 14 SG Tubes Containing Axial Indications Plugged1995-04-13013 April 1995 Special Rept:On 950401,thirty-two SG Tubes Containing Circumferential Indications & 14 SG Tubes Containing Axial Indications Plugged ST-HL-AE-4735, Suppl to 930108 Special Rept Re 8R Cylinder Exhaust Temp Exceeding Max Allowable Operating Exhaust Temp of 980 F, During Performance of Sdg 11 Operability Test on 921209. Original Classification as Valid Failure Changed to No Test1994-03-10010 March 1994 Suppl to 930108 Special Rept Re 8R Cylinder Exhaust Temp Exceeding Max Allowable Operating Exhaust Temp of 980 F, During Performance of Sdg 11 Operability Test on 921209. Original Classification as Valid Failure Changed to No Test ST-HL-AE-4713, Special Rept on:940203,standby Diesel Generator 11 Failed to Obtain Normal Voltage & Frequency.Caused by Relay Contact Failure.Investigation of Event Still Ongoing.Results of Investigation Will Be Documented in Special Rept1994-03-0707 March 1994 Special Rept on:940203,standby Diesel Generator 11 Failed to Obtain Normal Voltage & Frequency.Caused by Relay Contact Failure.Investigation of Event Still Ongoing.Results of Investigation Will Be Documented in Special Rept ST-HL-AE-4699, Special Rept:On 940113,SDG 12 Output Breaker Tripped.Caused by Voltage Regulator (Vr) Failure.Final Test Rept from Vr Vendor Will Be Evaluated to Determine If Addl Actions Required to Increase Reliability of Vr Module1994-02-11011 February 1994 Special Rept:On 940113,SDG 12 Output Breaker Tripped.Caused by Voltage Regulator (Vr) Failure.Final Test Rept from Vr Vendor Will Be Evaluated to Determine If Addl Actions Required to Increase Reliability of Vr Module ST-HL-AE-4604, Special Rept:On 930919,valid Failure of Sdg 11 Occurred Due to Failure of Operational Amplifier on pre-position Board. Troublshooting Conducted,Resulting in Replacement pre-position Board1993-10-25025 October 1993 Special Rept:On 930919,valid Failure of Sdg 11 Occurred Due to Failure of Operational Amplifier on pre-position Board. Troublshooting Conducted,Resulting in Replacement pre-position Board ST-HL-AE-4602, Special Rept:On 931007,insp Resulted in Plugging of fifty- One Tubes Between Four Steam Generators.Reasons for Tube Plugging Summarized as Listed1993-10-15015 October 1993 Special Rept:On 931007,insp Resulted in Plugging of fifty- One Tubes Between Four Steam Generators.Reasons for Tube Plugging Summarized as Listed ST-HL-AE-4576, Special Rept:On 930904,completed ISI of Unit 2 Sg.Tube in SG a Had Imperfection Depth Exceeding TS Limit of 40% of Nominal Tube Wall Thickness Due to Avb Wear.Tube Stabilized & Plugged1993-09-16016 September 1993 Special Rept:On 930904,completed ISI of Unit 2 Sg.Tube in SG a Had Imperfection Depth Exceeding TS Limit of 40% of Nominal Tube Wall Thickness Due to Avb Wear.Tube Stabilized & Plugged ST-HL-AE-4300, Special Rept:On 921209,SDG 11 Was Unloaded & Declared Inoperable Due to High Exhaust Temperature.Insp & Lubrication of Remaining Sdgs in Both Units Has Been Performed to Identify Similar Freedom of Movement Problems1993-01-0808 January 1993 Special Rept:On 921209,SDG 11 Was Unloaded & Declared Inoperable Due to High Exhaust Temperature.Insp & Lubrication of Remaining Sdgs in Both Units Has Been Performed to Identify Similar Freedom of Movement Problems ST-HL-AE-4299, Special Rept:On 921128,Seismic Monitoring Sys Declared Inoperable & Placed in Out of Svc Log When Listed Hardware Problems Identified.Caused by Failure to Properly Manage TS Required Equipment Priorities.Sys Returned to Operability1993-01-0707 January 1993 Special Rept:On 921128,Seismic Monitoring Sys Declared Inoperable & Placed in Out of Svc Log When Listed Hardware Problems Identified.Caused by Failure to Properly Manage TS Required Equipment Priorities.Sys Returned to Operability ST-HL-AE-4270, Special Rept:On 921022,nonvalid Failure of Standby DG 12 Occurred During Standby DG Operability Surveillance Test. Caused by Tripped Generator Breaker Lockout Relay at Local Control Panel.Surveillance Procedures to Be Revised1992-11-20020 November 1992 Special Rept:On 921022,nonvalid Failure of Standby DG 12 Occurred During Standby DG Operability Surveillance Test. Caused by Tripped Generator Breaker Lockout Relay at Local Control Panel.Surveillance Procedures to Be Revised ST-HL-AE-4258, Special Rept:On 921007,SDG Tripped on Turbocharger Thrust Bearing Failure.Caused by Improper Installation of New Eutectic or Degradation of Turbocharger.Turbocharger Replaced.Vendor Manual,Drawings & Procedures Revised1992-11-13013 November 1992 Special Rept:On 921007,SDG Tripped on Turbocharger Thrust Bearing Failure.Caused by Improper Installation of New Eutectic or Degradation of Turbocharger.Turbocharger Replaced.Vendor Manual,Drawings & Procedures Revised ST-HL-AE-4262, Special Rept:On 921014,Standby Diesel Generater 12 Shed Load to 0 Kw Due to Failure of Swing Disk Check Valve in Fuel Supply Line.Damaged Check Valve Replaced & Internals Removed.Remaining Check Valves Inspected1992-11-12012 November 1992 Special Rept:On 921014,Standby Diesel Generater 12 Shed Load to 0 Kw Due to Failure of Swing Disk Check Valve in Fuel Supply Line.Damaged Check Valve Replaced & Internals Removed.Remaining Check Valves Inspected ST-HL-AE-4172, Special Rept:On 920708,SDG 13 Tripped on Low Turbocharger Lube Oil & Inlet Pressure.Caused by Presence of Water in Valve Cover Which Led to Corrosion.Design Changes to Provide Drainage to Valves Will Be Evaluated1992-08-0707 August 1992 Special Rept:On 920708,SDG 13 Tripped on Low Turbocharger Lube Oil & Inlet Pressure.Caused by Presence of Water in Valve Cover Which Led to Corrosion.Design Changes to Provide Drainage to Valves Will Be Evaluated ST-HL-AE-4166, Special Rept:On 920630,CR Annunciator Lamp 22M01 Window F-1, Isolation Valve Cubicle Temp High Alarmed.Caused by Train D Cubicle Temp.Investigation Into Root Cause Ongoing1992-07-29029 July 1992 Special Rept:On 920630,CR Annunciator Lamp 22M01 Window F-1, Isolation Valve Cubicle Temp High Alarmed.Caused by Train D Cubicle Temp.Investigation Into Root Cause Ongoing ST-HL-AE-4165, Suppl to 920430 Special Rept:On 920408,nonvalid Failure of Sdg 21 Occurred When Sdg Tripped When Released from Emergency Mode.Cause Not Determined.Power Supply Mfg by Beta Products.No Corrective Actions Warranted1992-07-29029 July 1992 Suppl to 920430 Special Rept:On 920408,nonvalid Failure of Sdg 21 Occurred When Sdg Tripped When Released from Emergency Mode.Cause Not Determined.Power Supply Mfg by Beta Products.No Corrective Actions Warranted ST-HL-AE-4142, Special Rept:On 920610,SDG 22 Tripped When Released from Emergency Mode.Caused by Regulator Valve Not Providing Sufficient Air Pressure.Troubleshooting & Repair on Annunciator Alarm Panel Performed1992-07-0909 July 1992 Special Rept:On 920610,SDG 22 Tripped When Released from Emergency Mode.Caused by Regulator Valve Not Providing Sufficient Air Pressure.Troubleshooting & Repair on Annunciator Alarm Panel Performed ST-HL-AE-4137, Supplement to Special Rept Re Sdg Valid Failure on 901126. Caused by Less than Adequate Design of Delivery Valve Holder Which Is Prone to cracking.Cooper-Bessemer Owners Group Recommendations for Resolving Problem to Be Implemented1992-07-0606 July 1992 Supplement to Special Rept Re Sdg Valid Failure on 901126. Caused by Less than Adequate Design of Delivery Valve Holder Which Is Prone to cracking.Cooper-Bessemer Owners Group Recommendations for Resolving Problem to Be Implemented ST-HL-AE-4094, Special Rept:On 920408,SDG 21 Tripped When Released from Emergency Mode.Cause Has Not Been Determined.Further Analysis & Investigation Performed on Sdg 21.Supplemental Rept Will Be Submitted by 9207301992-05-0808 May 1992 Special Rept:On 920408,SDG 21 Tripped When Released from Emergency Mode.Cause Has Not Been Determined.Further Analysis & Investigation Performed on Sdg 21.Supplemental Rept Will Be Submitted by 920730 ST-HL-AE-4087, Special Rept:On 920409,channels a & C of Reactor Vessel Water Level Indication Sys (Rvwlis) Inoperable.Caused by Type of Copper Wiring Used in Circuit.Rvwlis Probes for Channels a & C Replaced1992-05-0808 May 1992 Special Rept:On 920409,channels a & C of Reactor Vessel Water Level Indication Sys (Rvwlis) Inoperable.Caused by Type of Copper Wiring Used in Circuit.Rvwlis Probes for Channels a & C Replaced ST-HL-AE-4065, Special Rept:On 911206,emergency Mode Sdg 23 Tripped W/No Test Mode Trips Indicated.Caused by Foreign Matl Under Seat of Check Valves Allowing Decrease in Air Pressure. Troubleshooting for Sdg 23 & 24 Has Been Completed1992-04-30030 April 1992 Special Rept:On 911206,emergency Mode Sdg 23 Tripped W/No Test Mode Trips Indicated.Caused by Foreign Matl Under Seat of Check Valves Allowing Decrease in Air Pressure. Troubleshooting for Sdg 23 & 24 Has Been Completed ST-HL-AE-4064, Special Rept:Discovered That Tendon Filler Grease Voids Exceeded Surveillance Requirement 4.6.1.6.1.d.2 Max of 5% Net Duct Vol.Caused by Spaces in Tendon Bubble.Adequate Grease Protection Exists for Tendons1992-04-22022 April 1992 Special Rept:Discovered That Tendon Filler Grease Voids Exceeded Surveillance Requirement 4.6.1.6.1.d.2 Max of 5% Net Duct Vol.Caused by Spaces in Tendon Bubble.Adequate Grease Protection Exists for Tendons ST-HL-AE-4037, Special Rept Re Evaluation of Unit 2 Third Yr Containment Tendon Surveillance.Refilling of Grease Accomplished Simultaneously W/Discoveries of Voids as Result of Insp Process Used1992-03-30030 March 1992 Special Rept Re Evaluation of Unit 2 Third Yr Containment Tendon Surveillance.Refilling of Grease Accomplished Simultaneously W/Discoveries of Voids as Result of Insp Process Used ST-HL-AE-3985, Special Rept:On 911224,control Valve Failed Open Causing Reduction of Reactor Coolant Sys Pressure.Cause Can Not Be Determined.Verified No Loose Connections,High Resistant Contacts or Voltage Fluctuations Present1992-01-23023 January 1992 Special Rept:On 911224,control Valve Failed Open Causing Reduction of Reactor Coolant Sys Pressure.Cause Can Not Be Determined.Verified No Loose Connections,High Resistant Contacts or Voltage Fluctuations Present ST-HL-AE-3960, Special Rept:On 911212,standby Diesel Generator 11 Nonvalid Failure Occurred Due to High Resistance of Relay Contacts within Instantaneous Preposition Board.Instantaneos Preposition Board Replaced & Similar Relays to Be Inspected1992-01-10010 January 1992 Special Rept:On 911212,standby Diesel Generator 11 Nonvalid Failure Occurred Due to High Resistance of Relay Contacts within Instantaneous Preposition Board.Instantaneos Preposition Board Replaced & Similar Relays to Be Inspected ST-HL-AE-3955, Special Rept:On 911206 & 07,standby DGs 23 & 21 Tripped W/ No Test Mode Trips Indicated When Released from Emergency Mode.Cause Not Known.Work Packages Developed to Troubleshoot Standby DGs & to Determine Causes of Trips1992-01-0303 January 1992 Special Rept:On 911206 & 07,standby DGs 23 & 21 Tripped W/ No Test Mode Trips Indicated When Released from Emergency Mode.Cause Not Known.Work Packages Developed to Troubleshoot Standby DGs & to Determine Causes of Trips ST-HL-AE-3929, Supplement to Special Rept:On 910710,spraying Lube Oil Leak Discovered at Cylinder 7R & Engine Manually Secured.Caused by Break in Exhaust rocker-to-inlet Rocker Crossover Lube Oil Line.Design of Lube Oil Line Changed1991-12-19019 December 1991 Supplement to Special Rept:On 910710,spraying Lube Oil Leak Discovered at Cylinder 7R & Engine Manually Secured.Caused by Break in Exhaust rocker-to-inlet Rocker Crossover Lube Oil Line.Design of Lube Oil Line Changed ST-HL-AE-3951, Special Rept:On 911025,SDG 21 Found to Have Fuel Oil Leak at Injection Pump.Caused by Delivery Valve Holder Design Prone to Cracking.Testing Frequency for Sdg 21 Remains at Once Per 31 Days1991-12-18018 December 1991 Special Rept:On 911025,SDG 21 Found to Have Fuel Oil Leak at Injection Pump.Caused by Delivery Valve Holder Design Prone to Cracking.Testing Frequency for Sdg 21 Remains at Once Per 31 Days ST-HL-AE-3937, Special Rept:On 911030,fuel Oil Leak Occurred at Cylinder 5R on High Pressure Fuel Oil Supply Line Connection to Fuel Oil Injector.Evaluation Underway to Determine Cause. Injector & Fuel Oil Line Replaced1991-11-27027 November 1991 Special Rept:On 911030,fuel Oil Leak Occurred at Cylinder 5R on High Pressure Fuel Oil Supply Line Connection to Fuel Oil Injector.Evaluation Underway to Determine Cause. Injector & Fuel Oil Line Replaced ST-HL-AE-3928, Special Rept:On 911025,fuel Oil Leak Found at Injection Pump 9L of Standby Diesel Generator 21.Caused by Crack on Threaded Portion of Delivery Valve Holder.Holder Will Be Replaced W/New Cooper-Bessemer Holder by Next Outage1991-11-25025 November 1991 Special Rept:On 911025,fuel Oil Leak Found at Injection Pump 9L of Standby Diesel Generator 21.Caused by Crack on Threaded Portion of Delivery Valve Holder.Holder Will Be Replaced W/New Cooper-Bessemer Holder by Next Outage ST-HL-AE-3910, Special Rept:On 911006,standby Diesel Generator 21 Tripped & Coasted to Stop.Caused by Malfunction in Amerace Relays in 62CL Circuit Due to End Life.Relays Replaced1991-11-0505 November 1991 Special Rept:On 911006,standby Diesel Generator 21 Tripped & Coasted to Stop.Caused by Malfunction in Amerace Relays in 62CL Circuit Due to End Life.Relays Replaced ML20085D7161991-10-11011 October 1991 Special Rept:On 910913,standby Diesel Generator 23 Would Not Close on Demand from Control Room.Caused by Failure to Fully Rack in Diesel Output Breaker & Inadequate Work Practices. Nonlicensed Operator Counseled & New Policy Will Be Written ST-HL-AE-3889, Special Rept:On 910904,SDG 22 Failed.Caused by Intermittent Malfunctioning of Instantaneous Preposition Board. Instantaneous Preposition Board Replaced & Applicable Relays in Emergency Mode Tested for Proper Resistance1991-10-0404 October 1991 Special Rept:On 910904,SDG 22 Failed.Caused by Intermittent Malfunctioning of Instantaneous Preposition Board. Instantaneous Preposition Board Replaced & Applicable Relays in Emergency Mode Tested for Proper Resistance ST-HL-AE-3900, Special Rept:On 910913,output Breaker CS06 for Standby DG 23 Would Not Close on Demand from Control Room.Nonlicensed Operator Dispatched to Investigate Cause of Event.Caused by Inadequate Work Practices.Personnel Counseled1991-09-13013 September 1991 Special Rept:On 910913,output Breaker CS06 for Standby DG 23 Would Not Close on Demand from Control Room.Nonlicensed Operator Dispatched to Investigate Cause of Event.Caused by Inadequate Work Practices.Personnel Counseled ST-HL-AE-3834, Special Rept:On 910710,spraying Lube Oil Leak Identified at Cylinder 7R & Standby Diesel Generator Declared Inoperable. Caused by Break in Exhaust Rocker to Inlet Rocker Crossover Lube Oil Line.Wall Thickness Tubing Replaced1991-08-0909 August 1991 Special Rept:On 910710,spraying Lube Oil Leak Identified at Cylinder 7R & Standby Diesel Generator Declared Inoperable. Caused by Break in Exhaust Rocker to Inlet Rocker Crossover Lube Oil Line.Wall Thickness Tubing Replaced ST-HL-AE-3837, Suppl to Special Rept Re Inoperable Primary Meteorological Tower Instrument.Primary Meteorological Tower Restored to Operable Status on 910627 & Operator Log Procedures for Towers Enhanced1991-07-31031 July 1991 Suppl to Special Rept Re Inoperable Primary Meteorological Tower Instrument.Primary Meteorological Tower Restored to Operable Status on 910627 & Operator Log Procedures for Towers Enhanced ST-HL-AE-3814, Special Rept:On 910616,primary Meteorological Tower Wind Direction Sensor at 60 Meter Elevation Declared Inoperable Due to Indication Problems Resulting in Entry Into Tech Spec 3.3.3.4 Action Statement1991-07-0303 July 1991 Special Rept:On 910616,primary Meteorological Tower Wind Direction Sensor at 60 Meter Elevation Declared Inoperable Due to Indication Problems Resulting in Entry Into Tech Spec 3.3.3.4 Action Statement 1998-09-24
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20217K9441999-10-15015 October 1999 SER Accepting Util Alternative Proposed Relief Request RR-ENG-2-4 for Second 10-year ISI Interval at Stp,Units 1 & 2 Pursuant to 10CFR50.55a(a)(3)(i) ML20217K9151999-10-15015 October 1999 SER Authorizing Util Relief Request RR-ENG-2-3 for Second 10-year ISI Interval of Stp,Units 1 & 2 Pursuant to 10CFR50.55a(a)(3)(i) NOC-AE-000676, Monthly Operating Repts for Sept 1999 for South Texas Project,Units 1 & 2.With1999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for South Texas Project,Units 1 & 2.With ML20217D0531999-09-30030 September 1999 Rev 1 to STP Electric Generating Station Unit 2 Cycle 7 Colr ML20217D0481999-09-30030 September 1999 Rev 1 to STP Electric Generating Station Unit 1 Cycle 9 Colr ML20211P8411999-09-0909 September 1999 Safety Evaluation Supporting Alternative Proposed by Licensee to Surface Exam to Perform Boroscopic VT-1 Visual Exam of Pump Casing Welds within Pump Pits for Welds Covered by Relief Request RR-ENG-24 ML20211P7811999-09-0909 September 1999 SER Approving Second 10-year Interval Inservice Insp Program Plan Relief Request RR-ENG-2-8 (to Use Code Case N-491-2) for South Texas Project,Units 1 & 2 ML20211Q6731999-09-0909 September 1999 Safety Evaluation Accepting First 10-yr Interval ISI Program Plan Request for Relief from ASME Code Case N-498 NOC-AE-000643, Monthly Operating Repts for Aug 1999 for South Texas Project,Units 1 & 2.With1999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for South Texas Project,Units 1 & 2.With ML20212E5191999-08-31031 August 1999 Rev 3 to SG-99-04-005, STP 1RE08 Outage Condition Monitoring Rept & Final Operational Assessment ML20211F4531999-08-24024 August 1999 Safety Evaluation Supporting Licensee Proposed Alternative to Defer Partial First Period Exams of flange-to-shell Weld to Third Period & Perform Required Ultrasonic Exams,Both Manual & Automated,During Third Period ML20211F5111999-08-23023 August 1999 Safety Evaluation Supporting Licensee Proposed Alternative Contained in Request for Relief RR-ENG-30 ML20210C9411999-07-31031 July 1999 Rev 1 to SG-99-07-002, South Tx,Unit 1 Cycle 9 Voltage- Based Repair Criteria 90-Day Rept, Jul 1999 ML20210R3631999-07-31031 July 1999 Monthly Operating Repts for July 1999 for South Tx Project, Units 1 & 2.With ML20210D9161999-07-23023 July 1999 Safety Evaluation Accepting Inservice Testing Relief Request RR-56 Re Component Cooling Water & Safety Injection Sys Containment Isolation Check Valve Closure Test Frequency ML20210D4821999-07-21021 July 1999 1RE08 ISI Summary Rept for Steam Generator Tubing of South Texas Project Electric Generating Station Unit 1 ML20210D4491999-07-21021 July 1999 Revised Chapters to Operations QA Plan, Including Rev 9 to Chapter 1.0, Organization & Rev 6 to Chapter 16.0, Independent Technical Review NOC-AE-000583, LER 99-S03-00:on 990619,failure to Revitalize Sdg Number 11 Was Noted.Caused by Failure to Communicate Status of Sdg. Subject Sdg Revitalized on 990619 & Licensee Will Develop Security Force Instruction Re Sdgs.With1999-07-15015 July 1999 LER 99-S03-00:on 990619,failure to Revitalize Sdg Number 11 Was Noted.Caused by Failure to Communicate Status of Sdg. Subject Sdg Revitalized on 990619 & Licensee Will Develop Security Force Instruction Re Sdgs.With ML20207H6361999-07-0808 July 1999 Safety Evaluation Approving 2nd 10 Yr Interval ISI Program Plan Request to Use ASME Section XI Code Case N-546 for Licenses NPF-76 & NPF-80,respectively ML20216D7481999-07-0707 July 1999 1RE08 ISI Summary Rept for Welds & Component Supports of STP Electric Generating Station,Unit 1 NOC-AE-000593, Monthly Operating Repts for June 1999 for Stp,Units 1 & 2. with1999-06-30030 June 1999 Monthly Operating Repts for June 1999 for Stp,Units 1 & 2. with NOC-AE-000570, LER 99-S01-00:on 990527,discovered That Unescorted Access Had Been Inappropriately Granted.Caused by Failure to Follow Procedure.Util Verified That Individual Did Not Have Current Unescorted Access at STP or Any Other Util.With1999-06-28028 June 1999 LER 99-S01-00:on 990527,discovered That Unescorted Access Had Been Inappropriately Granted.Caused by Failure to Follow Procedure.Util Verified That Individual Did Not Have Current Unescorted Access at STP or Any Other Util.With ML20196G5821999-06-23023 June 1999 LER 99-S02-00:on 990601,failure to Maintain Positive Control of Vital Area Security Key Was Noted.Caused by Lack of Attention to Detail.Discussed Event with Operator Involved IAW Constructive Discipline Program ML20195J6871999-06-17017 June 1999 Safety Evaluation Supporting Proposed Alternative Contained in RR-ENG-2-5.Proposed Alternative Authorized Per 10CFR50.55a(a)(3)(i) for 2nd ISI Interval ML20196A2391999-06-15015 June 1999 Change QA-042 to Rev 13 of Operations QAP, Reflecting Current Organizational Alignment for South Texas Project & Culminating Organizational Realigment That Has Been Taking Place During Past Several Months NOC-AE-000563, Monthly Operating Repts for May 1999 for Stp,Units 1 & 2. with1999-05-31031 May 1999 Monthly Operating Repts for May 1999 for Stp,Units 1 & 2. with ML20206U5411999-05-18018 May 1999 Non-proprietary Errata Pages for Rev 2,Addendum 1 to WCAP-13699, Laser Welded Sleeves for 3/4 Inch Diamete Tube Feedring Type & W Preheater SGs Generic Sleeving Rept ML20206A7721999-04-30030 April 1999 STP Electric Generating Station Unit 1 Cycle 9 Colr NOC-AE-000543, Monthly Operating Repts for Apr 1999 for Stp,Units 1 & 2. with1999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for Stp,Units 1 & 2. with ML20205H0321999-03-31031 March 1999 Change QA-040 to Rev 13 of Operations QA Plan NOC-AE-000507, Monthly Operating Repts for Mar 1999 for Stp,Units 1 & 2. with1999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for Stp,Units 1 & 2. with ML20205A3781999-03-22022 March 1999 STP Electric Generating Station Simulator Certification Four Yr Rept for Units 1 & 2 ML20204B2711999-03-15015 March 1999 Safety Evaluation Authorizing 990201 Request to Authorize Alternative to Regulations Per 10CFR50.55a(a)(3)(i) That Would Revise Start of Second 120-month IST Interval to No Later than 011201 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 NOC-AE-000468, Monthly Operating Repts for Feb 1999 for South Texas Project Electric Generating Station.With1999-02-28028 February 1999 Monthly Operating Repts for Feb 1999 for South Texas Project Electric Generating Station.With ML20207D1101999-02-24024 February 1999 Change QA-039 to Rev 13 of Operations QA Plan, for STP ML20203H8361999-02-17017 February 1999 Safety Evaluation Supporting Request for Relief from ASME Code Requirements for Class 3 Piping for Plant ML20202H9621999-02-0303 February 1999 SER Accepting Change to EALs Used in Classification of Emergency Conditions ML20202E8471999-01-31031 January 1999 2RE06 ISI Summary Rept for SG Tubing of STP Electric Generating Station,Unit 2 ML20216G2011999-01-31031 January 1999 City Public Svc of San Antonio Annual Rept 1998-1999 ML20199G5961999-01-31031 January 1999 Cycle 7 Voltage-Based Repair Criteria Rept for Jan 1999 ML20199K7711999-01-21021 January 1999 Safety Evaluation Accepting ISI Program Request for Relief for ASME Cose Repair Requirements for Code Class 3 Piping ML20199G8161999-01-19019 January 1999 SER Accepting Util 970707 Response to NRC 970509 RAI Re GL 92-08, Thermo-Lag 330-1 Fire Barriers. NRC Finds No Significant Safety Hazards Based on Application of Util Ampacity Derating Methodology ML20199H4981999-01-11011 January 1999 2RE06 ISI Summary Rept for Welds & Component Supports of Stp,Unit 2 ML20206Q3751999-01-0404 January 1999 2RE06 ISI Summary Rept for Sys Pressure Tests (Class 1 & 2) ML20206Q3721999-01-0404 January 1999 2RE06 ISI Summary Rept for Repairs & Replacements ML20216G2171998-12-31031 December 1998 Houston Industries 1998 Annual Rept. App a 1998 Financial Statements & Us Securities & Exchange Commission Form 10-K Encl NOC-AE-000403, Monthly Operating Repts for Dec 1998 for South Texas Project Unit 1 & 2.With1998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for South Texas Project Unit 1 & 2.With ML20216G1521998-12-31031 December 1998 Central & South West Corp 1998 Summary Annual Rept & Securities & Exchange Commission Form 10-K ML20198M3431998-12-28028 December 1998 SER Accepting Util Request for Relief from ASME Code Repair Requirements for ASME Code Class 3 Piping for South Texas Project,Unit 2 1999-09-09
[Table view] |
Text
_____ -
' The Light cllou.oton mp a ny ?""'""" I"l"' IA""I' U"'"*""8 M*d""
1.lghting & l'ower I " ' I'" ' * ""d ' "" h ' 'I " " # #
March 30, 1992 ST-llL- AE- 4 03 7 Filo No.: G02 10CFR50.36 U- S. Nuclear Regulatory Commiusion Attention: Docuw nt Contr** nosk We.shington, DC 20S55 South Texas Proje Electric Conorating Station Unit 2 Docket No. STH S0-499 Special Report Regarding An Evaluation of The Unit 2 Thirst Year containment _TenAOD Survoillanco Pursuant to the South Texas Project Electric Conorating Station Technical Specifications 3.6.1.6, llouston Lighting & Power submits the attached Special Report regarding an ovaluation of the Unit 2 third year containment tendon surveillance.
If you should have any questions on this matter, plesso contact Mr. C. A. Ayala at (512) 972-8628 or me at (512) 972-7205.
r k .k %
William J. Junt-Manager Nuclear Licensing JMP/atnp
Attachment:
Special Report Regarding An Evaluation Of the Unit 2 Third Year Containment Tendon Surveillance osoosa /pk o,
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WNW# A Subsidiary of liouton Induqtin incorporated 9204030147 920330 PDR ADCCK 05000499 S PDR
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11ouston lighting k Power Company
, , South Texas Projett Elettric Generating Station liL-AE-4 g;
Paga 2 Cet Regional Administrator, Region IV Rufus S. Scott Nuclear Regulatory Commission Associate General Counsel.
611 Ryan-Plaza Drive, Suite 400 Houston Lighting & Power Company Arlington, TX 76011 P. 0. . Box 61867 Ifouston, TX 77208 George Dick, Project Manager
~
U.S. Nuclear Regulatory Commission INPO j Washington, DC 20555 Records Contor 1100 Circle 75 Parkway ;
J. I.'Tapia Atlanta, GA 30339-3064 .
- Senior Resident Innpector '
c/o U. S.-Nuclear Regulatory Dr.- Joseph M. }{ondrie i
' Commission 50 Bellport Lane !
lP . O . . Box 910 Bellport, NY- 11713 t Bay City, TX 77414 D.RK. Lacker J..R. Newman, Esquire Bureau of Radiation Control Novman C.Holtzinger, P.C. Texas Department of }{calth 1615 L Street,-N.W. 1100 West 49th Street Washington, DC 20036 Austin, TX 78756-3189 .
- D. E._ Ward /T. M. Puckett ,
Contral Power.and Light Company ;
P. - O . Box 2121 Corpus Christi,-TX 78403 J. C. Lanier/M. B. Leo City of Austin Electric Utility Department P.O. Box 1088-Austin, TX 78767 i K. J. Fiedler/M. T. Hardt City Public Servico Board ,
P. O. Box 1771 San Antonio,-TX 78296 Revised 10/11/91 -
L4/NRC/.
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- _ . _ - - - - - - _ - . - - - . . ~ . . . -- - - - - - - - - . - . - - . .
i Attachment ST-IIL-AE-4 03 7 -
pago 1 of 4 South Texas project Electric Gonorating Station ;
Unit 2 ;
Docket No. STN 50-499 !
'pocial Report Regarding An Evaluation of 11ut 1 2, Third Year containment Tendon _ Surveillance Technical Spocification 4.6.1.6 requires that the structural integrity of the containment tendons bo demonstrated at the end of '
1, 3, and 5 Years following the initial containment structural integrity test and at 5 year intervals thoroaf ter. Daring the performanco of the year throo surveillanco it was discovered that i tendon fillor grease voids in excosa of the Surveillanco >
Haquiroment 4.6.1.6.1d.2 maximum of 5 porcent of not duct volumo l existed. Compliance with the associated action statomont required !
rostoration of containment structural intogrity, which was not >
compromised by the voids, performance of an engineering ovaluation and submittal of this Special Report.- lloto that refilling of greano was accomplished simultaneously with the discoverlos of voids as a result of the inspection process used.
Ton Reactor Containment Building tendons woro inspected.
Eight had grease. voids excooding the 5 percent of not duct volume as described above. The two satisfactory tendons wore the control tendons.
which areControl inspected tendons during (211075 and each2V110)illanco.are surve designated The tendons tendon identification numbers and groaso void volumes which excooded the 5 porcent of not duct volumo were as follows: '
Void Volume Tendon f inercent of duct volume) ;
1H007 5.7%
1H078 11.0%
3H002 6.7% 3 3H008 7.4%
3111 1 0 6.9%
2V113 6.0%
2V119 9.0%
2V227 8.2%
l
$ RIP \92 072,001
- , - - _ . _ _ _ _ ._ _-_. ., , _ . _ , _ _ . _ . _ . _ _ . _ , . . . _ _ - . - -. . . . ~ . . _ _ _ _ _ . _ . . . _ . , - .
Attachment ST-HL-A'E-4 03 7 $
Page 2 of 4
-g South Texas Project Electric Generating Station Unit 2 Docket No. STN 50-499 g Gpecial Report Regarding An Evaluation of s . The Unit 2 Third Year Containment Tendon Surveillance l
The main purpose for the sheathing fille material grease is
,. ovide long term corrosion protection for rue tendon wires and t'
.. arage components. Initial installation of che sheathing filler _
39 acial involved pumping the beated grease into the tendon v~'
. ching (duct) f rom one end of the horizontal tendon and continue aping until the hot grease (temperature > congealing point) is ected from the opposite end of the horizonta) tendon with a c m inuous stream of hot grease flow, free of air bubbles and i algn substances. AC,ditionally, for horizontal tendons rouced akie discontinuities such as a penetration, the sheathing was vented to release entrapped air during grease injection. Filling the vertical tendons is basically the same, except pumping is performed frw both ends of the tendon until the hot grease is ejected f rom tue high point vent located at the ape >_ of the dome. G This installation procedure assured that the tendon had been tnoroughly coated with grease over its entire length including filling the grease caps, thus encasing the tendon-end anchorages.
In addition, the tendon wires were coated with a temporary corrosion preventative Visconorust, 1601-Amber after fabrication for stcrag" sW handling of the tendon coil. Furthermore, the cedon wires wro hand-coated with Visconorust 2090 P-4 (grease) durcing installation where :he temporary corrosion preventative -
caterial had toen scraped off and to lubricate the tendon for insertion into the duct. This insured that all of the tendon wires were coated with corrosion inhibitor at the time of inscallation and maintained corrosion-free through their entire service life.
Greuse voids are expected in the tendon ducts. The percent voids can be in excess of the 5% limit for several reasons which are explained below:
- 1) Shrinkage of grease occurs since the grease was initially 1 injected at a temperature between 150 and 250 degrees.
The grease (Visconorust 2090 P-4) has a coefficient of expansion which yields an expansion of about 1% per 20*F.
Initial installation temperatures are typically greater than 18 0'F . Depending on the ambient temperature, shrinkage can be in excess of 4%.
$ REP \92-072,001
-Attachment ST-Hb-AE-4037 Page 3 of 4 South Texas Project Electric Generating Station Unit 2 Docket No. STN 50-499 Special Report Regarding An Evaluation of The Unit 2 Third Yegr Containment Tendon Surveillance
- 2) Spaces exist between the wires in the tendon bundle. The tendon is made up of 186 tightly wound wires. This condition makes it very difficult to fill all spaces betwesn the wires during initial installation because the tendon is at ambient temperature. As the hot grease surrounded the tendon, it is possible that it worked its way into the middle spaces of the tendon bundle. These spaces make up a minimum of 3% of the net duct volume for a given tendon. In addition, this migration of grease may occur in areas where the tendon is in contact -
with the sheathing, which is not considered in the previous 3%.
- 3) The initial installation process took care to eliminate duct voids as much as possible; however, it does introduce air into the duct during the pumping of the greasa. The process of pumping grease into the duct entrains air inside the greese. This entrained air _can surface from suspension between the time the duct is filled and the surveill.ance is performed. Additionally, air becomes entrapped while the grease is pumped from one end of the sheathing to the other end, which can be as long as 600 feet. This introduction of entrained and entrapped air can account for a significant percentage
-of the additional- grease p' imped into the tendon duct during the surveillance.
Therefore, voids in the range of 5.7% to 11.0% discovered during this surveillance are reasonable. There was no evidence of grease leakage as determined by performing a visual inspection of the accessible containment surfaces and by holding the pressure for one hour after replacing the greasa. A visual examination of exposed - anchorage components wac performed at both ends of the 4
tendons.and there was no evidence of degradation.
l-4 SREP\92 072.001
Attachment ST-HL-AE-4037 Page ? of 4 South Texas Project Electric Generating Jtation Unit 2 Pocket No. STN 50-499 Special Report Regarding An Evaluation of
,The Unit 2 Third Year Containment Tendon Surveillance As previously stated, the tendon wires and anchorage system weAe coated with storage or fillor grease prior to installation and the ducts were completely filled with filler material from one end of the tendon to the other at initial installation. Special consideration was given to the formulation of the filler grease as the original specification required it to have a liquid vapor phase it.t.ibitor for the prevention of corrosion within the voids. The filler material was also required to contain additives to enhance 3 the corrosion-inhibiting and wetting properties, as well as to form a chemical bond with the tendon steel. Therefore, the corrosion protection for the tendons not included in this surveillance is naintained.
Previous surveillances at other plants which have similar installation of tendons have shown that the existence of grease voids in the ducts have not had adverse affects on the tendons.
Additionally, the v.mufacturer of the grease has suggested against eliminating
- olds Tom the tendon duct due to the coefficient of expansion of the grease discussed in item 1 above, when the grease is installed while containment ambient temperature is below the upper operating range. The duct needs some void area to allow the grease to expand in order not to be detrimental to the to.ndon cheathing.
In conclusion, grease was initially installed throughout the entire length ci the tendon ducts and grease coverage was assured.
The grease will adhere-to the tendon and protect the wires from corrosion. There is a vapor phase inhibitor in the Visconorust 2090 P-4 for the prevention of corrosion within voids as well as additives to enhance corrosion-inhibiting properties of the grease.
The tendons which had voids have been filled and there is no evidence of grease leakage from the sheathing. The remaining tendons in the containment structure are adequate in their existing condition since minimum grease coverage still exista do y: ovide corrosion protection for the post-tensioning system. Adequate grease coverage exists for the tendons to maintain corrosion e protection and no grease leakage is evident, therefore, containment
& integrity is assured.
ISREP\92072.00 _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ -
I