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    "query_string": "[[Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO]] [[Site::Palo Verde]]",
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	Issue date	Title	Topic
ML17303A433	9 June 1987	Special Rept 2-SR-87-017:on 870604,reactor/turbine Trip Occurred Due to Low Level Condition in Steam Generator 2. Trip Caused Excessive Feedwater Flow Which Was Attributed to Delay in Closing Economizer Valves
ML17303A483	10 July 1987	Special Rept 2-SR-87-020:on 870619,inoperable Containment Bldg Atmosphere Pressure Monitor RU-1 Exceeded 72 H Limit. Caused by Need to Replace Channel 2 Detector.Radiation Monitoring Unit Task Force Established to Review Occurrence
ML17303A487	10 July 1987	Special Rept SR-87-003:on 870613,diesel Generator a Tripped on Sensed Overspeed Condition.Caused by Separation of 2 Piece Connecting Cable at Coupling.Separated Cable Reconnected.Investigation Into Cause of Separation Ongoing
ML17303A516	17 July 1987	Special Rept 2-SR-87-021:on 870620,noble Gas Activity Monitor RU-141 Experienced Microprocessor Lockup.Cause Unknown.Troubleshooting Conducted to Reset Central Processing Unit to Remove Monitor from Lockup
ML17303A642	23 October 1987	Special Rept 2-SR-87-002-01:on 870222,inoperability of high-range Noble Gas Activity Monitor RU-144 Exceeded 72 H Tech Spec Limit.Caused by Performance of Maint Work on Monitor.Voltage Supply Replaced & Monitor Returned to Svc
ML17303A643	23 October 1987	Supplemental Special Rept 2-SR-86-037-01:on 861107,Tech Spec Requirement Violated.Caused by Inoperability of Containment Monitor RU-1 for More than 72 H Due to Inoperable Particulate Channel.Channel Tested & Declared Operable
ML17303A644	23 October 1987	Special Rept 2-SR-87-021-01:on 870625,condenser Evacuation Sys High Range Monitor Inoperable for Greater than 72 H. Caused by Microprocessor Lockup.Central Processing Unit Replaced
ML17303A668	29 October 1987	Special Rept 2-SR-87-025:on 871002,radiation Monitoring Unit RU-142 Declared Inoperable for Greater than 72 H.Caused by Intermittent Fluctuations Occurring in Cpu Board Reset Switch.Monitors Declared Operable & Returned to Svc
ML17303A672	3 November 1987	Special Rept 2-SR-87-026:on 871007,radiation Monitor Inoperable for Greater than 72 H.Caused by Noises in Air pump.RU-1 Declared Operable After Satisfactory Installation & Testing of Replacement Air Pump
ML17303A673	5 November 1987	Special Rept 1-SR-87-023:on 870930,cathodic Protection Sys for Diesel Generator Fuel Oil Storage Tanks Inoperable for More than 30 Days.Caused by Delay in Delivery of Anode Bed Backfill Matl.Mod Completion Expected by 871215
ML17303A676	5 November 1987	Special Rept 2-SR-87-027:on 871009,high Range Noble Gas Monitor Inoperable for Greater than 72 H.Caused by Malfunctioning of RU-143 Smic Display Board.Display Board Replaced
ML17303A677	5 November 1987	Special Rept 2-SR-87-005-01:on 870110,high-range Noble Gas Activity Monitor Inoperable for Greater than 72 H.Monitor Removed from Svc to Allow Replacement of Memory Chip as Sys Upgrade.Monitor Declared Operable on 870316
ML17303A680	9 November 1987	Special Rept 3-SR-87-007:on 871013,emergency Diesel Generator a Tripped on Incomplete Sequence.Caused by Defective Power Resistor Due to Overheating & Fatigue. Design Change Initiated to Replace Power Resistors
ML17303A696	18 November 1987	Special Rept 2-SR-87-028:on 871014,post-accident Sampling Sys (PASS) Inoperable Due to Radioactive Water Leak.Caused by Leakage Through PASS Sample Isolation Valve.Pass Sample Isolation Valve & Liquid Septum Replaced
ML17303A697	18 November 1987	Special Rept 3-SR-87-005:on 871020,condenser Evacuation Sys Radioactive Gaseous Effluent Monitors Declared Inoperable Due to Erratic Readings on RU-141.Caused by Noise within Detector.Detector Replaced & Surveillance Commenced
ML17303A705	24 November 1987	Suppl 2 to Special Rept 2-SR-86-008:on 860326,condenser Evacuation Sys high-range Radiation Monitor Declared Inoperable & Exceeded Tech Spec Limit.Caused by Moisture in in Process/Sample Flow Media Causing Flow Filter Clogging
ML17303A726	7 January 1988	Special Rept 3-SR-87-009:on 871211,plant Vent High Range Gaseous Activity Monitor RU-144 Inoperable for Greater than 72 H.Caused by Isolation Board Malfunction.Board Replaced & Retested & Surveillance Tests for Monitors Completed
ML17303A731	12 January 1987	Special Rept 3-SR-87-008,on 871217,containment Vessel Structural Integrity Not Verified within Required Time Frame.Caused by Surveillance Test 73ST-32CO1 Not Completed. Containment Vessel Declared Operable on 871218
ML17303A994	5 April 1988	Special Rept 2-SR-88-001:on 880311,radioactive Gaseous Effluent Monitors RU-144 & RU-143 Rendered Inoperable for Greater than 72 H.Caused by Reworking & Replacing of Components to Correct High Voltage Failure
ML17303B003	4 April 1988	Special Rept 1-SR-88-003:on 880304,output Breaker on Diesel Generator B Did Not Close Properly During Surveillance Testing.Cause Undetermined.Evaluation Initiated to Determine Cause of Improper Breaker Operation
ML17303B019	8 April 1988	Special Rept 1-SR-88-002:on 880314,72 H Limit for Returning Containment Area Monitor to Svc Exceeded.Cause Undetermined. Containment Area Monitor RU-149 Not Returned to Operable Status Pending Evaluation of Data
ML17303B026	12 April 1988	Special Rept 1-SR-88-004:on 880407,loose Part Detection Instrumentation Declared Inoperable for More than 30 Days. Caused by Breakup of Signal Coming from Sensor.Work Control Document Prepared & Will Be Scheduled for Next Outage
ML17303B053	18 April 1988	Special Rept 3-SR-88-002:on 880328,radiation Monitoring Unit Inoperable for Greater than 72 H Due to Unsatisfactory Performance of Source Check.Caused by Excessive High Voltage from Faulty High Voltage Board.Detector Replaced
ML17303B078	22 April 1988	Special Rept 2-SR-88-003:on 880324,radioactive Gaseous Effluent Monitor Inoperable for More than 72 H.Authorized Work Document Issued to Troubleshoot & Rework/Replace Components to Correct Low Flow Alarms
ML17303B079	22 April 1988	Special Rept 2-SR-88-004:on 880324,radioactive Gaseous Effluent Monitors Inoperable for More than 72 H.Authorized Work Document Issued to Implement Plant Change Package for Monitor RU-143 & to Change Default Parameters
ML17303B133	18 May 1988	Special Rept 2-SR-88-005:on 880509,inservice Insp of Steam Generators Completed Resulting in Plugging of 34 Tubes in Steam Generator 1 & 27 Tubes in Steam Generator 2.Complete Results of Insp Will Be Provided within 12 Months
ML17304A219	15 June 1988	Special Rept 3-SR-88-001:on 880516,radiation Monitoring Unit Inoperable for Greater than 72 H.Caused by Flow Totalizer Exhibiting Offset W/No Flow Through Monitor.Flow Transducer & Totalizer Replaced.Request for Evaluation Submitted
ML17304A259	11 July 1988	Special Rept 1-SR-88-005:fire Occurred in Auxiliary Transformer Resulting in Loss of Nonclass 1E Ac Power.Fire Extinquished & Notification of Unusual Event Terminated.When Bus Energized,Second Fire Started.Plant Remained Stable
ML17304A341	10 August 1988	Special Rept 3-SR-88-003:on 880714,radioactive Gaseous Effluent Monitors Declared Inoperable for Greater than 72 H. Caused by Incorrect Diodes Installed on High Voltage Circuit Board.Voltage Board Replaced & Test Procedure Revised
ML17304A343	10 August 1988	Suppl 1 to Special Rept 2-SR-87-024:on 870918,72 H Limit for Inoperability Exceeded for high-range Noble Gas Monitor. Caused by Poor Design for Check Source Circuitry.Design Change Prepared for Implementation to Eliminate Circuit	Grab sample
ML17304A366	22 August 1988	Special Rept 3-SR-88-004:on 880725,reactor Vessel Water Level Sys Channel B Declared Inoperable.Caused by Previous Failures on 880219 & 0706 of Malfunctioning Heated Junction Thermocouples Mechanism.Channel Will Be Restored	Reactor Vessel Water Level Post Accident Monitoring
ML17304A411	24 August 1988	Special Rept 1-SR-88-006:on 880817,30-day Action Statement for Operability of Seismic Monitoring Sys Exceeded.Caused by Seimic Accelerometer Trigger Card (Setpoint) Out of Calibr. Card Recalibr.Sys Returned to Operable Status on 880818
ML17304A504	31 August 1988	Special Rept 1-SR-88-007:on 880815,radiation Monitoring Unit Inoperable for Greater than 72 H,Per Tech Specs 6.9.2 & 3.3.3.8.Channel Source Rod Arm Slide Cam Was Binding on Metal Canister.Slide Cam Reworked to Prevent Binding
ML17304A508	8 September 1988	Special Rept 3-SR-88-005:on 880818,high Range Noble Gas Monitor RU-142 Inoperable for Greater than 72 H,Per Tech Spec 3.3.3.8,Action 42(b).Approved Work Document Initiated to Troubleshoot Cause of Monitor Malfunction & Rework
ML17304A555	12 September 1988	Suppl to Special Rept 1-SR-85-010:on 850509,emergency Diesel Generators a & B Failed to Attain Required Voltage,Frequency & Speed.Caused by Inadequate Design of Heater Control Sys. Mod to Replace Temp Control Valves Implemented
ML17304A637	11 October 1988	Special Rept 2-SR-88-002:on 880912,radiation Monitor Inoperable for Greater than 72 H.Preplanned Alternate Sampling Program Initiated to Monitor Fuel Bldg Ventilation Sys When Needed
ML17304A678	26 October 1988	Special Rept 2-SR-88-007:on 881001,condenser Vacuum Pump/ Gland Seal Exhaust Low & high-range Monitors Declared Inoperable for Greater than 72 H.Caused by Defective Mylar Window on Detector.Replacement Detector Installed
ML17304A726	7 November 1988	Special Rept 2-SR-88-006:on 881014,72 H Limit for Operability Exceeded for Containment Bldg Atmosphere Process Monitor.Caused by Error in Procedure.Procedure Corrected
ML17304A734	7 November 1988	Special Rept 3-SR-88-007:on 881024,reactor Vessel Water Level Sys Declared Inoperable for More than 48 H.Caused by Malfunction in Communications Board.Board Replaced & Installed on 881028	Reactor Vessel Water Level
ML17304A776	22 November 1988	Special Rept 1-SR-88-008:on 881113,Tech Specs Violated. Caused by Loose Part Detection Channel Being Inoperable for More than 30 Days Due to Problems W/False Alarms.Sys Will Be Monitored Once Per 24 H & Investigation Initiated
ML17304A790	6 December 1988	Special Rept 23-SR-88-008:on 881108,7 Day Limit for Inoperability of Post Accident Sampling Sys Exceeded.Caused by Inadequate Flow Measuring Unit.Inlet Isolation Valve Reinstalled
ML17304A859	30 December 1988	Special Rept 3-SR-88-008:on 881205,high-range Effluent Monitor RU-142 Declared Inoperable as Result of Condenser Evacuation Sys low-range Noble Gas Effluent Monitor Inoperable Due to Erratic Flow.Caused by Water Buildup	Grab sample
ML17304A863	9 January 1989	Special Rept:On 890103,facility Suffered Complete Loss of Offsite Power Due to Lightning Striking Circuits Between ESF Svc Transformers.Troubleshooting & Rework Performed & Two Primary Side Bushings Changed on Each Transformer
ML17304A867	9 January 1989	Special Rept 2-SR-88-009:on 881206,condenser Vacuum Pump/ Gland Seal Exhaust Low & High Range Monitors Declared Inoperable Due to Intermittent Spiking on Low Range Monitor. Monitors Left Inoperable for Troubleshooting of Problem
ML17304B006	31 January 1989	Special Rept 3-SR-89-001:on 890105,plant Vent Sys Radioactive Gaseous Effluent Monitors Inoperable for More than 72 H.Caused by Monitors Needing Corrective Maint & Design Enhancements.Monitors Restored to Svc on 890108
ML17304B068	8 March 1989	Special Rept 3-SR-89-002:on 890303,electrical Grid Disturbance Occurred,Causing Fault Near Devers,Ca Switchyard & Opening of Main Generator Output Breakers.Low Pressure Reactor Trip & Main Turbine Trip Also Occurred
ML17304B072	15 March 1989	Special Rept 3-SR-89-003:on 890215,radioactive Effluent Monitor Inoperable for Greater than 72 H.Approved Work Document Initiated to Troubleshoot Cause of Inconsistent RU-141 Indication	Grab sample
ML17304B073	16 March 1989	Special Rept 1-SR-89-002:on 890215,7 Day Limit Exceeded for Inoperability of post-accident Sampling Sys Due to Valve Failing Surveillance Test.Caused by Misoperation of Bypass Valve During RCS Sampling.Sys Returned to Svc on 890308
ML17304B101	7 April 1989	Special Rept 1-SR-89-001:on 890306,Channel B Reactor Vessel Water Level Sys Inoperable for Period Greater than 7 Days. Approved Work Document Initiated to Determine Cause of Improper Operation of Sys.Channel Will Be Replaced	Reactor Vessel Water Level Post Accident Monitoring Temporary Modification
ML17304B141	25 April 1989	Special Rept 1-SR-89-003:on 890330,condenser Evacuation Sys High Range Effluent Monitor RU-142 Declared Inoperable for More than 72 H Due to Engineering Concerns Re Moisture in Gas Channel.Long Term Design Mods Implemented

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