ML20205G261
ML20205G261 | |
Person / Time | |
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Site: | San Onofre ![]() |
Issue date: | 04/01/1999 |
From: | Scherer A SOUTHERN CALIFORNIA EDISON CO. |
To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
References | |
NUDOCS 9904070184 | |
Download: ML20205G261 (2) | |
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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 ML20035D6541993-04-0808 April 1993 Suppl to 930311 Special Rept Re Inoperability of Secondary Channel of Delta Temp Meteorological Instrumentation.Caused by Intermittent Faulty Indication Between Signal Wire & Terminal Connector Lug.Lug Replaced ML20034H0131993-03-11011 March 1993 Special Rept:On 930222,meteorological Monitoring Delta Temp Instrument Declared Inoperable When Difference Between Primary & Secondary Channels Excessive.Cause Not Determined. in Interim,Channel Continues to Provide Accurate Data 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 ML13316A1391992-11-30030 November 1992 Special Rept:On 921111,R-1254 Exhibited mid-range Signal Noise Spiking & Declared Inoperable Due to Malfunctioning Detector Assembly.Detector Assembly Replaced & Sys Returned to Normal 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 ML20028H2781990-11-13013 November 1990 Special Rept:On 901029,condenser Evacuation Sys Noble Gas Monitor Inoperable for More than 72 H.Monitor Will Return to Svc by 901119,following Completion of Satisfactory Channel Calibr 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 ML13331A4711990-07-25025 July 1990 Ro:During June 1990,two Closure Mechanism & Three Latching Mechanism Failures Identified in Unit 1 & 20 Latching Mechanism & Nine Closure Mechanism Failures Identified in Units 2 & 3.Compensatory Fire Watches Established ML13331A4621990-07-25025 July 1990 Ro:Followup Rept for Tech Spec fire-rated Assemblies Found Inoperable During Routine Surveillances in June 1990. Compensatory Fire Watches Established.Supporting Info Encl 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 ML13316A0621990-06-25025 June 1990 Special Rept:On 900611,plant Exceeded Reporting Requirements of License Condition 3.M(4) Re Reactor Vessel Thermal Shield Monitoring.Neutron Noise Will Be Recorded & Thermal Shield Motion Evaluated Twice Per Wk,Until Supporting Sys Replaced ML13331A4491990-06-15015 June 1990 Followup Ro:On 900507,fire Door FH2-304 Found Blocked Open During Routine Fire Door Surveillance.Door Blocked During Removal of Sealing Equipment from Fuel Handling Bldg.All Personnel Involved in Reracking Project Work Reinstructed ML13316A0601990-06-0606 June 1990 Special Rept:On 900523,signal from One of Eight Detectors Monitoring Reactor Vessel Thermal Shield Exceeded 200% Criteria in 8.2 Hertz Frequency Band.Caused by Random Spike.Monitoring Frequency Increased to 5 Days Per Wk ML13316A0591990-04-23023 April 1990 Ro:Followup on Tech Spec fire-rated Assemblies Found Inoperable During Routine Surveillances in Mar 1990.Rept Identifies 21 Latching Mechanism Failures & 6 Closure Mechanism Failures for Units 2 & 3.No Failure for Unit 1 ML20042E1251990-04-0404 April 1990 Special Rept:On 900325,meteorologic Tower Declared Inoperable for More than 7 Days.Caused by Failure of Primary Delta Temp Channel ML13331A3891990-03-26026 March 1990 Ro:On 900206,19 & 22,latching & Closure Mechanism Failures Occurred at Units 2 & 3 & Common Battery Room Fire Doors Blocked Open to Maintain Battery Room Temps During Maint. Fire Watches Established.Disciplinary Action Taken ML13331A3861990-03-26026 March 1990 Ro:On 900220,four Battery Room Fire Doors Found Blocked Open During Routine Fire Door Surveillance Walkdown.Caused by Failure to Establish Compensatory Fire Watch Prior to Blocking Open Doors.Appropriate Disciplinary Action Taken ML20012D9201990-03-20020 March 1990 Special Rept:On 900312,planned Maint Outage of 1E Bs Bus Initiated to Complete 5-yr Bus Cleaning Surveillance, Rendering All Fire Dectection Sys Alarms & Sprinkler Sys Inoperable.Containment Air Temps Monitored Hourly ML13331A3631990-02-16016 February 1990 Ro:Followup Rept for Tech Spec Fire Rated Assemblies Found Inoperable During Routine Surveillances in Jan 1990.One Fire Door Found Blocked Open W/O Proper Authorization.Individual Identified & Disciplinary Action Taken ML20011E3211990-02-0101 February 1990 Special Rept:On 891227,pressurizer Base Support Strong Motion Accelerometer 2XT-8020D Declared Inoperable for More than 30 Days Due to Playback Readings Outside Test Acceptance Criteria.Repairs Planned During Next Outage ML20006A8031990-01-16016 January 1990 Followup Rept:During Dec 1989,fire Doors Found Inoperable During Routine Surveillances.Two Latching Mechanism Failures & One Closure Failure for Unit 1 & 19 Latching Mechanism Failures & 14 Closure Failures for Units 2 & 3 Noted ML20005D6971989-12-11011 December 1989 Special Rept:On 891127,wide Range Gas Monitor Removed from Svc for Performance of 18-month Channel Calibr Surveillance. Monitor Will Be Returned to Svc by 891216 Following Completion of Satisfactory Channel Calibr ML19332F1791989-11-30030 November 1989 Ro:Air Ejector Exhaust Treatment Sys Inoperable for More than 31 Days.Sys Declared Inoperable.Failure to Implement Reporting Requirement Attributed to Inadequate Guidance in Interpretation of Intent & Requirement of Tech Spec ML19325E2921989-10-18018 October 1989 Followup Ro:In Sept 1989,identified Fire Doors Found Inoperable During Routine Surveillances Consisting of 17 Latching Mechanism Failures & 8 Closure Mechanism Failures. No Doors Found to Be Blocked Open 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 1999-09-13 Category:TEXT-SAFETY REPORT MONTHYEARML20217B4471999-10-0707 October 1999
[Table view]Safety Evaluation Supporting Amends 159 & 150 to Licenses NPF-10 & NPF-15,respectively ML20217E3381999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for Songs,Units 2 & 3 05000361/LER-1999-005-01, :on 990831,loss of Physical Separation in Control Room,Occurred.Caused by Personnel Error.Creacus Train a Was Returned to Standby on 9908311999-09-23023 September 1999
ML13309A4481998-12-31031 December 1998 Riverside Public Utilities 1997-1998 Annual Rept ML20199F0771998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for Songs,Units 2 & 3 ML13309A4441998-12-31031 December 1998 Sempra Energy 1998 Annual Rept ML20206H2101998-12-31031 December 1998 SCE 1998 Annual Rept 1999-09-09 |
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- gg souisitus cAurousir A. Edward scherer d EDISON 5"Lgm xn unsas njuismow-cen, April 1,1999 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 -
4
Subject:
Docket 50-362 Special Report - Radiation Monitoring instrumentation (RMI)
)
San Onofre Nuclear Generating Station, Unit 2
Reference:
Letter from A. E. Scherer (SCE) to Document Control Desk (USNRC),
"Special Report: Licensee Controlled Specification 3.3.102,
' Radiation Monitoring Instrumentation (RMI),' San Onofre Nuclear Generating Station, Unit 3," dated January 21,1999 i
Gentlemen:
This letter provides a Special Report to the NRC in accordance with Licensee Controlled Specification (LCS) 3.3.102. This LCS requires Southern California Edison (SCE) to maintain two Plant Vent Stacks Wide Range Noble Gas Monitor channels (2RT-7865 and 3RT-7865) operable when either Unit is operating in Modes 1 through
- 3. When two Wide Range Monitor channels are not restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, a Special Report must be submitted within the next 14 days.
Unit 3 is currently in a refueling outage. During the outage, SCE plans to modify 3RT-7865 to allow this monitor to provide input to the new Radiation Monitoring Data Acquisition System. To implement this change, SCE removed 3RT-7865 from service on March 28,1999. The monitor is scheduled to returned to service prior to MODE 4 entry (currently forecast for early May,1999) which will exceed the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed be LCS 3.3.102. In the interim, an alternate method of monitoring will be used as required by the LCS. (An earlier companion change to Unit 2 monitor 2RT-7865 was discussed in the above referenced letter.)
D 5
9904070184 990401 D
PDR ADOCK 05000362
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s PoR P. O. Nx 128 San Clemente, CA 92674-0128 949- % 8-7501 Fax 949-368-7575
i 1
l Qocument Control Desk April 1,1999 l
l This letter contains no new commitments. If you require any additional information, please advise.
i l
Sincerely, 1
cc:
E. W. Merschoff, Regional Administrator, NRC Region IV J. A. Sloan, NRC Senior Resident inspector, Units 2 and 3 L. Raghaven, NRC Project Manager, San Onofre Units 2 and 3 i
institute of Nuclear Power Operations (INPO) 1 r
r l