ML20097F838
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| ML20097F838 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/08/1992 |
| From: | Rosenblum R SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9206160075 | |
| Download: ML20097F838 (1) | |
Similar Documents at San Onofre | |
|---|---|
Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARML20212A1471999-09-13013 September 1999
[Table view]Special Rept:On 990904,condenser Monitor Was Declared Inoperable.Difficulties Encountered During Component Replacement Precluded SCE from Restoring Monitor to Service within 72 H.Alternate Method of Monitoring Was Established ML20205G2611999-04-0101 April 1999 Special Rept:On 990328,3RT-7865 Was Removed from Service. Monitor Is Scheduled to Be Returned to Service Prior to Mode 4 Entry (Early May 1999) Which Will Exceed 72 H Allowed by LCS 3.3.102.Alternate Method of Monitoring Will Be Used ML20202F7041999-01-21021 January 1999 Special Rept:On 990106,SCE Began to Modify 2RT-7865.2RT-7865 to Allow Monitor to Provide Input to New Radiation Monitoring Data Acquisition Sys.Monitor Found to Exceeds 72 H Allowed Bt LCS 3.3.102.Alternate Monitoring Established ML20198A6731998-12-11011 December 1998 Special Rept:On 981124,meteorological Sys Wind Direction Sensor Was Observed to Be Inoperable.Caused by Loss of Communication from Tower to Cr.Sensor Was Replaced & Sys Was Declared Operable on 981204 ML20199J1321997-11-20020 November 1997 Special Rept:On 971014,return to Operability Delayed After Planned Upgrade of Recording Devices from Analog Tape Decks to Solid State Digital Devices Completed.Caused by Problems W/Test Circuitry.Restored to Operable Status ML20217F4041997-10-0303 October 1997 Ro:On 970731,discovered That Intrusion Detection Sys segment,guardwire-645,did Not Have self-contained Backup Battery.Caused by Inadequate Field Change Notice.Will Install Battery for GW-645 by 971031 ML20216D2001997-09-0202 September 1997 Special Rept:On 970210,lock Change Out Occurred.Caused by Personnel Error.Immediately Replaced Locks W/Type Described in Scp,Supervisor Counseled on Event & Need to Verify Physical Security Plan & Commitments ML20217M4541997-08-15015 August 1997 Ro:On 970731,intrusion Detection Sys Segment Indicated Power Failure Alarm.Caused by Subject Segment Failing to Have Self Contained Battery Backup.Will Install Battery Backup to Power Supply for Segment ML20135D2181997-02-24024 February 1997 Special Rept:On 970214,util Recognized Range for Seismic Monitor PSR-1200 Did Not Reflect Functional Range of Monitor.Source of Error Unknown.Util Evaluating Rev to Table 3.3.104-1 to Ref Correct Range ML20134K4191996-11-0707 November 1996 Special Rept:On 961001,declared Vent Stack Wide Range Noble Gas Monitor 3RT-7865 Inoperable.Caused by Faulty Detector. Repaired Detector ML20116B3351996-07-23023 July 1996 Special Rept:On 960627,SG Base Support Strong Motion Accelerometer 2XT8020B Was Determined to Be Inoperable. Cause Will Not Be Known Until Local Insp Completed ML20093B2071995-10-0202 October 1995 Special Rept:On 950917,noted Plant Vent Monitors Been Out of Svc for Longer than Allowed.Operators Annotate Log Books Each Time Equipment Operability Status Changes.Rept Delayed in Order to Provide Complete Response ML20078B9631995-01-23023 January 1995 Special Rept:On 950104,all Functions of Primary Meteorological Instrument Tower (Met Tower) Failed. Caused by Short Circuit in non-weather Resistant Circuit Card.Operability of Met Tower Restored on 950120 ML20078K1971994-11-0808 November 1994 Special Rept:On 941029,util Removed Primary & Secondary Meteorological Towers from Svc for Planned Equipment Upgrades to Improve Sys Reliability ML20072A5251994-08-0505 August 1994 Special Rept:On 940804,identified That on 940803,an out-of- Service HPSI Pump Had Been Operated for Approximately Two Hours Without Cooling Water Flow to Motor.Findings & C/As Will Be Discussed at 940818 SALP Meeting ML20069M9661994-06-17017 June 1994 Ro:On 940607,cabinet Containing Wiring for Security Computer Sys Not Fastened Closed.Cabinet Fastened Closed W/ one-way Screws & Determined to Be in Conformance W/Security Plan ML20063B9791994-01-25025 January 1994 Special Rept:On 931216,strong Motion Accelerometers (SMA) 2XT-8020B & 2XT-8020E Determined to Be Inoperable During Monthly Surveillance Testing.Sma 2XT-8020B Will Be Inspected & Repaired During Next Outage of Sufficient Duration ML20127A6151992-12-24024 December 1992 Special Rept:On 921211,meteorological Monitoring Delta Temp Instrument Declared Inoperable When Difference Between Primary & Secondary Sensors Noted to Be Excessive.Corrective Actions Did Not Resolve Problem.Sensors Replaced ML20117A5811992-11-24024 November 1992 Special Rept:On 921021,determined That SG Was Inoperable for More than 30 Days Following Performance of Monthly Surveillance Test.Caused by Failure in Field Sensor.Repair Will Be Made During Next Outage of Sufficient Duration ML20106A0191992-09-11011 September 1992 Followup Ro:Determined That Exhaust Dampers in EOF Ventilation Sys Not Installed as Required During Testing Per NRC Info Notice 92-032.Caused by Air Inleakage Above Acceptable Levels.Physical Mods Will Be Completed by 921215 ML20141M4611992-08-27027 August 1992 Special Rept:On 920810,condenser Evacuation Sys wide-range Noble Gas Monitor 2RT-7870 Declared Inoperable After Failing self-controlled Check Source Test for More than 72 H.Caused by Faulty Operating Mechanism.Detector Replaced on 920825 ML20097F8381992-06-0808 June 1992 Special Rept:On 920507,steam Generator Base Support Strong Motion Accelerometer Did Not Respond to Calibr Signal or Natural Frequency Signal & Declared Inoperable.Cause Not Determined.Troubleshooting to Be Performed During Shutdown ML20091M9921992-01-23023 January 1992 Special Rept:On 920108,Meteorological Tower Declared Inoperable When Sensors Could Not Be Calibrated to Required Specifications.Sensors Repaired & Replaced & Returned to Svc on 920115 ML20079H3311991-10-0808 October 1991 Special Rept:On 911001,Train B Emergency Diesel Generator Declared Inoperable to Perform Quarterly Preventive Maint & to Verify Torque on Cam Shaft.Caused by Fractured/Cracked Cam Shaft.Fire Watch Established within 1 H ML20081G1471991-06-0303 June 1991 Special Rept Re Condenser Evacuation Sys Noble Gas Monitor Inoperable for Longer than 72 H During Modes 1,2,3 & 4. Preventive & Corrective Maint Being Performed on Monitor. Monitor Will Be Returned to Svc by 910614 ML20055J3871990-07-30030 July 1990 Special Rept:On 900620,reactor Coolant Pump Strong Motion Accelerator Inoperable Following Performance of Routine Monthly Surveillance Test.Cause Undetermined.Troubleshooting & Repair Efforts Performed ML20055F7651990-07-16016 July 1990 Special Rept:On 900706,w/Unit 3 in Mode 5,three Out of Four Reactor Coolant Pump Spray/Sprinkler Deluge Valves Failed to Initiate Control Room & Emergency Svc Ofc Alarms During Surveillance Trip Testing.Limit Switches Cleaned ML20246D7881989-08-0909 August 1989 Followup Special Rept Re Inoperable Fire Doors Found During Jul 1989 Surveillance & Consists of Nine Latching Mechanism Failures & Two Closure Mechanism Failures.Fire Watches Established.No Doors Found Blocked Open in Jul ML20247E0611989-07-19019 July 1989 Special Rept:On 890707,meteorological Monitoring Instrumentation Channels out-of-svc for More than 7 Days to Perform Semiannual Monitoring Instrumentation Channel Calibr Surveillance.Tower Will Be Back in Svc by 890721 ML20245K6951989-06-22022 June 1989 Special Rept:On 890521,north Turbine Bldg Chemical Treatment Area Fire Spray Sys/Sprinkler Sys Removed from Svc & Inoperable for More than 14 Days.Containment Fire Spray Sys Also Inoperable Since 890528 ML20246N1611989-05-0808 May 1989 Special Rept:On 890407,discovered That Channel a Indication for Reactor Vessel Level Monitoring Sys Level 6 Not Operating Properly.Caused by Malfunctioning Reactor Vessel Probe.Probe Will Be Replaced w/in-kind Spares ML20153G2431988-08-19019 August 1988 Special Rept:On 880818,requirements Re Fire Protection Plan Not Fully Implemented by End of Cycle IV Refueling Outage Per Previous Licensing Commitment.Deficient Fuses Identified & Replacement Fuses Immediately Installed ML20237H0141987-08-19019 August 1987 Special Rept:On 870707,fire Detection Instrumentation for Fire Zone 8 Removed from Svc.While Performing Maint,Spurious Alarms Received.Caused by Failed Circuit Boards.Boards Replaced.Zone 8 Returned to Svc on 870807 ML20245B7161987-06-22022 June 1987 Special Rept:On 870511 & 18,containment Fire Spray Sys Removed from Svc to Perform Insp,Design Change Mods & Miscellaneous Maint.Fire Watch Established.Sys Scheduled to Be Returned to Svc Prior to Startup from mid-cycle Outage ML20205G8001987-03-16016 March 1987 Followup Rept Re Tech Spec fire-rated Assemblies (Fire Doors) Found Inoperable During Routine Surveillances in Feb 1987.Fire Door Failures Included 12 Latching & 7 Closure Mechanism Failures.Mar Rept Will Be Submitted on 870415 ML20211P0951987-02-12012 February 1987 Followup Ro:In Jan 1987,during Surveillances,Fire Doors Found Inoperable.Caused by Latching Mechanism & Closure Mechanism Failures.Fire Watches Established & Failures Corrected.Feb 1987 Followup Rept Will Be Issued by 870316 ML20210L4481987-02-0202 February 1987 Special Rept:On 860928,uninterruptible Power Supply Inverter Static Bypass Switch Failed to Illuminate.Caused by Corroded Circuit Boards.Inverter Not Required for Safe Shutdown for Any Postulated Fire.Licensing Documents Will Be Revised ML20210S8051987-01-12012 January 1987 Followup RO Re fire-rated Assemblies (Fire Doors) Found Inoperable During Routine Surveillances in Dec 1986. Inoperable Fire Doors Include Five Latching Mechanism & Three Closure Mechanism Failures.Next Rept by 870216 ML20214P9621986-11-12012 November 1986 Special Rept:On 861027,condenser Evacuation Sys wide-range Noble Gas Monitor Out of Svc for More than 72 H.Caused by Failure of low/mid-range Grab Sample Timer.Timing Unit Module Replaced & Sys Returned to Svc ML20214P7851986-11-10010 November 1986 Followup Rept Re fire-rated Assemblies (Specifically Fire Doors) Found Inoperable During Routine Surveillances from 860824-1031.Mechanism Failures Corrected on as-found Basis ML20213G7071986-11-0606 November 1986 Special Rept:On 861020,condenser Evacuation Sys wide-range Noble Gas Monitor RI-7870 mid/high-range Channel Indication Found to Be Oscillating & Monitor Removed from Svc.Caused by Failed Preamplifier Circuit Board Due to Aging ML20215N0791986-10-10010 October 1986 Followup Rept Re fire-rated Assemblies (Specifically Fire Doors) Found Inoperable During Routine Surveillances in Sept 1986.Door Mechanism Being Corrected on as-found Basis ML20203N2831986-09-12012 September 1986 Followup Ro:Listed fire-rated Assemblies & Fire Doors Found Inoperable During Routine Surveillance in Aug 1986. Inoperable Fire Doors Included 10 Latching Mechanism & Two Closure Mechanism Failures.Compensatory Watches Initiated ML20212P7781986-08-15015 August 1986 Followup Ro:Listed fire-rated Assemblies Found Inoperable During Routine Surveillances in Jul 1986.Compensatory Fire Watches Established & Door Mechanism Failures Being Corrected ML20207J5921986-07-14014 July 1986 Followup Ro:Listed fire-rated Assemblies Found Inoperable During Routine Surveillances in June 1986.Compensatory Fire Watches Established ML20211N4411986-06-12012 June 1986 Followup Rept of fire-rated Assemblies Found Inoperable During Routine Surveillances in May 1986.Twelve Latching Mechanism Failures & 18 Closure Mechanism Failures Found. Followup Rept for June 1986 Expected by 860715 ML20205Q1281986-05-15015 May 1986 Followup Rept of fire-rated Assemblies Found Inoperable During Routine Surveillances in Apr 1986.Fire Watches Established as Listed Deficiencies Identified.Followup Rept on Inoperable Fire Doors Will Be Submitted by 860616 ML20210L0311986-04-18018 April 1986 Special Rept:On 860321,during Refueling Outage,Portion of Fire Main Removed from Svc for Mod of Fire Water Sys to Include Installation of Fire Suppression Sys, Per 10CFR50.48,App R.Sys Will Be Returned to Svc by May ML20155F7181986-04-0707 April 1986 Followup Rept of fire-rated Assemblies Found Inoperable During Routine Surveillance in Mar 1986.Fire Watches Established as Listed Deficiencies Identified.Followup Rept on Inoperable Fire Doors Will Be Submitted by 860515 ML20210E3531986-03-14014 March 1986 Followup Rept Re Inoperable Fire Doors Found During Routine Surveillance in Feb 1986.Thirteen Latching Mechanism Failures & Seven Closure Mechanism Failures Identified.Door Mechanism Failures Corrected 1999-09-13 Category:TEXT-SAFETY REPORT MONTHYEARML20217E3381999-09-30030 September 1999
[Table view]Monthly Operating Repts for Sept 1999 for Songs,Units 2 & 3 ML20212A1471999-09-13013 September 1999 Special Rept:On 990904,condenser Monitor Was Declared Inoperable.Difficulties Encountered During Component Replacement Precluded SCE from Restoring Monitor to Service within 72 H.Alternate Method of Monitoring Was Established ML20211N0511999-09-0303 September 1999 SER Approving Exemption from Certain Requirements of 10CFR50.44 & 10CFR50 App A,General Design Criterion 41 to Remove Requirements from Hydrogen Control Systems from SONGS Units 2 & 3 Design Basis ML20211Q8201999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for Songs,Units 2 & 3. with ML20211H8621999-08-23023 August 1999 Safety Evaluation Accepting Licensee Requests for Relief RR-E-2-03 - RR-E-2-08 from Exam Requirements of Applicable ASME Code,Section Xi,For First Containment ISI Interval ML20210P4791999-08-11011 August 1999 COLR Cycle 10 Songs,Unit 3 ML20210P4731999-08-11011 August 1999 COLR Cycle 10 Songs,Unit 2 ML20210Q6521999-07-31031 July 1999 Monthly Operating Repts for July 1999 for Songs,Units 2 & 3 ML20210L2771999-07-30030 July 1999 SONGS Unit 3 ISI Summary Rept 2nd Interval,2nd Period Cycle 10 Refueling Outage U3C10 Site Technical Services ML20209C9281999-06-30030 June 1999 Monthly Operating Repts for June 1999 for Songs,Units 2 & 3. with ML20195D3061999-06-0202 June 1999 Safety Evaluation of TR SCE-9801-P, Reload Analysis Methodology for San Onofre Nuclear Generating Station,Units 2 & 3. Rept Acceptable ML20195H5491999-05-31031 May 1999 Monthly Operating Rept for May 1999 for Songs,Units 2 & 3 ML20196L3221999-05-11011 May 1999 SONGS Unit 2 ISI Summary Rept 2nd Interval,2nd Period Cycle-10 Refueling Outage ML20206H2611999-05-0505 May 1999 Part 21 Rept Re Defect Found in Potter & Brumfield Relays. Sixteen Relays Supplied in Lot 913501 by Vendor as Commercial Grade Items.Caused by Insufficient Contact Pad Welding.Relays Replaced with New Relays ML20206S7281999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for Songs,Units 2 & 3 ML20205Q6221999-04-19019 April 1999 Safety Evaluation Authorizing Proposed Alternative to Use Wire Penetrameters for ISI Radiography in Place of ASME Code Requirement ML20205R0371999-04-16016 April 1999 SER Approving Proposed Deviation from Approved Fire Protection Program Incorporating Technical Requirements of 10CFR50,App R,Section III.0 That Applies to RCP Oil Fill Piping ML20205G2611999-04-0101 April 1999 Special Rept:On 990328,3RT-7865 Was Removed from Service. Monitor Is Scheduled to Be Returned to Service Prior to Mode 4 Entry (Early May 1999) Which Will Exceed 72 H Allowed by LCS 3.3.102.Alternate Method of Monitoring Will Be Used ML20205Q0981999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for Songs,Units 2 & 3 ML20204F8101999-02-28028 February 1999 Monthly Operating Repts for Songs,Units 2 & 3.With ML20203J1981999-02-12012 February 1999 Safety Evaluation Supporting Amends 149 & 141 to Licenses NPF-10 & NPF-15,respectively ML20202F7041999-01-21021 January 1999 Special Rept:On 990106,SCE Began to Modify 2RT-7865.2RT-7865 to Allow Monitor to Provide Input to New Radiation Monitoring Data Acquisition Sys.Monitor Found to Exceeds 72 H Allowed Bt LCS 3.3.102.Alternate Monitoring Established ML20199F0771998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for Songs,Units 2 & 3 ML20206H2101998-12-31031 December 1998 SCE 1998 Annual Rept ML20198A6731998-12-11011 December 1998 Special Rept:On 981124,meteorological Sys Wind Direction Sensor Was Observed to Be Inoperable.Caused by Loss of Communication from Tower to Cr.Sensor Was Replaced & Sys Was Declared Operable on 981204 ML20196D8901998-11-30030 November 1998 Non-proprietary Reload Analysis Methodology for Songs,Units 2 & 3 ML20198C3471998-11-30030 November 1998 Monthly Operating Repts for Nov 1998 for Songs,Units 2 & 3 ML20195H2471998-10-31031 October 1998 Monthly Operating Repts for Oct 1998 for Songs,Units 2 & 3 ML20154B7211998-10-0101 October 1998 Safety Evaluation Approving Licensee Request to Implement Alternatives Contained in Code Case N-546 for Current Interval at Songs,Units 2 & 3 Until Code Case Approved by Ref in Reg Guide 1.147 ML20154M7921998-09-30030 September 1998 Monthly Operating Repts for Sept 1998 for Songs,Units 2 & 3 ML20155F6081998-09-17017 September 1998 Non-proprietary Version of San Onofre 2 & 3 Replacement LP Rotors ML20151Z9851998-08-31031 August 1998 Monthly Operating Repts for Aug 1998 for Songs,Units 2 & 3 ML20151Q1211998-08-14014 August 1998 Rev 0 to Control of Hazard Barriers ML18066A2771998-08-13013 August 1998 Part 21 Rept Re Deficiency in CE Current Screening Methodology for Determining Limiting Fuel Assembly for Detailed PWR thermal-hydraulic Sa.Evaluations Were Performed for Affected Plants to Determine Effect of Deficiency ML20198G4491998-07-31031 July 1998 Rev 1 to WCAP-15015, Specific Application of Laser Welded Sleeves for SCE San Onofre Units 2 & 3 Sgs ML20237B8571998-07-31031 July 1998 Monthly Operating Repts for July 1998 for Songs,Units 2 & 3 ML20236N3871998-07-0909 July 1998 Part 21 Rept Re Deficiency Identified in Event 32725, Corrected by Mgp Instruments Inc.Licensee Verified,Affected Equipment Has Been Reworked & Tested at Sce.Design Mod Completed ML20236R1031998-06-30030 June 1998 Monthly Operating Repts for June 1998 for Songs,Units 2 & 3 ML20249A9431998-05-31031 May 1998 Monthly Operating Repts for May 1998 for Songs,Units 2 & 3 ML20248B8981998-05-26026 May 1998 Updated SG Run Time Analysis Cycle 9 ML20248B9221998-04-30030 April 1998 Rev 0 to AES 98033327-1-1, Updated Probabilistic Operational Assessment for SONGS Unit 2,Second Mid Cycle Operating Period,Cycle 9 ML20247L5181998-04-30030 April 1998 Monthly Operating Repts for Apr 1998 for Songs,Units 2 & 3 05000361/LER-1998-003, LOCA Evaluation of Safety Significance of Failure of Emergency Sump Valve Linestarter (LER 1998-003)1998-04-0606 April 1998 LOCA Evaluation of Safety Significance of Failure of Emergency Sump Valve Linestarter (LER 1998-003) ML20217Q6161998-04-0505 April 1998 Failure Analysis Rept 98-005,Failure Analysis of 2HV9305 Motor Starter ML20217A0141998-03-31031 March 1998 Monthly Operating Repts for Mar 1998 for Songs,Units 2 & 3 ML20217D4701998-03-0202 March 1998 Rev 1 to 90459, Failure Modes & Effects Analysis DG Cross- Tie,DCP7048.00SE ML20216J3551998-02-28028 February 1998 Monthly Operating Repts for Feb 1998 for Songs,Units 2 & 3 ML20203E7301998-02-17017 February 1998 SER Accepting 980105 Request to Use Mechanical Nozzle Seal Assembly as Alternate Repair Method,Per 10CFR50.55a(a)(3)(1) for Plant,Units 2 & 3 ML20203K9141998-02-0303 February 1998 Rev 0 to ESFAS Radiation Monitor Single Failure Analysis. W/96 Foldout Drawings ML20202F9731998-01-31031 January 1998 Monthly Operating Repts for Jan 1998 for Songs,Units 2 & 3 1999-09-30 |
Text
f:ME Southem Califamia Edison Company 23 f>AF4KrH STO& rt IRVINE, C AltPOF4NIA W710 nuru g ueu June 8. 1992 jnty,
- ft.CL L AR $4EdliLATLe84V Art mpig U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555
Subject:
Docket No. 50-361 Special Report San Onofre Nuclear Generating Station, Unit 2 This report is being submitted according to Technical Specification (TS) 3.3.3.3, Action a, of facility Operating 1.icense NPF-10, San Onofre Unit 2.
The TS requires Southern California Edison (SCE) to submit a Special Report when the seismic monitoring instrumentation becomes inoperable for more than 30 days.
On May 7, 1992, with Unit 2 in Mode 1 at 100% power, steam generator base support strong motion accelerometer (SMA) 2XT-8020B was-determined inoperable following performance of a routine monthly surveillance test. Specifically, the instrumentation did not respond to the calibration signal nor the natural frequency signal as required by. Procedure S023-11-2.1.
Investigation results to date have not been able to establish when the SMA failed. Initial troubleshooting of the seismic instrumentation components and circuitry could not fully determine the cause of the deficiency. -Further troubleshooting will require containment entry for accessing 2XT-8020B. Due to ALARA considerations during power operations, personnel are precluded from performing further investigative efforts. Troubleshooting and repair efforts for 2XT-8020B will be performed during the next Unit 2 shutdown of sufficient duration or the next Unit 2 refueling outage as allowed by Surveillance R?quirements, 4.3.3.3.2.
If you require any additional information, please let me know.
Very truly yours, h)H cc: J. B. Martin, Regional Administrator, NRC Region V M. B. Fields, NRC Project Manager, San Onofre Units 2 and 3 C. W. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2&3 dp '?$
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