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    "query_string": "[[Category:ABNORMAL OCCURRENCE REPORTS (SEE ALSO LER &amp; RO)]] [[Site::Oyster Creek||05000000]]",
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	Issue date	Title	Topic
ML19354C437	18 July 1974	AO 50-219/74/36:on 740710,RE03D Reactor High Pressure Sensor Failed to Trip at Point Less than or Equal to 1,060 Psig. Caused by Lack of Allowance for Setpoint Tolerances in Tech Specs.Sensor Recalibr & Returned to Svc
ML20003C379	26 April 1974	AO 50-219/74/29:on 740423,electromatic Relief Valve Pressure Switches 1A83B & 1A83D Tripped at Pressures in Excess of Max Allowable Value of 1,070 Psig.Caused by Instrument Drift. Switches Reset
ML20003C380	26 April 1974	AO 50-219/74-27:on 740417,insp Revealed Bergen-Paterson Hydraulic Shock & Sway Arrestors in Drywell Inoperable.Cause Undetermined.Units Will Be Replaced During Present Refueling Outage
ML20003C381	22 April 1974	AO 50-219/74/26:on 740412,emergency Svc Water Pump 52C Failed to Start.Caused by Thermal Overload Relay Coupled W/ Excess Current Relay.Feasibility Study Re Thermal Overload Relay Removal from Trip Circuits to Be Made
ML20003C382	19 April 1974	AO 50-219/74/24:on 740409,stack Gas Particulate Filter in Svc from 740328-31 Not Analyzed for Gross Beta,Gross Alpha & Gross Gamma as Required.Caused by Technician Error. Administrative Control to Be Tightened
ML20003C383	19 April 1974	AO 50-219/74/28:on 740419,suction Valve V-20-4 to Core Spray Pump B Stuck in Closed Position for 15 Minutes,Causing Loss of Core Spray Redundancy in Sys 2.Cause Undetermined.Valve Manually Opened & Circuit Breaker Tagged Open
ML20003C384	19 April 1974	AO 50-219/74/25:on 740409,butterfly Valve V-26-16 Found Open & Primary Containment Integrity Lost W/Reactor Critical & Water Temp Greater than 212F.Caused by Component Failure. Valve Manually Forced to Seat Properly & Shutdown Commenced
ML20003C385	18 April 1974	AO 50-219/74/27:on 740417,insp Revealed Bergen-Paterson Hydraulic Shock & Sway Arrestors in Drywell Inoperable.Cause Undetermined.Units Will Be Replaced During Present Refueling Outage
ML20003C387	10 April 1974	AO 50-219/74/25:on 740409,butterfly Valve V-26-16 Found Open & Primary Containment Integrity Lost W/Reactor Critical & Water Temp Greater than 212F.Cause of Component Failure Not Known.Valve Manually Forced to Seat Properly
ML20003C388	10 April 1974	AO 50-219/74-24:on 740409,stack Gas Particulate Filter in Svc from 740328-31 Not Analyzed for Gross Beta,Gross Alpha & Gross Gamma as Required.Cause Being Investigated
ML20003C389	25 March 1974	AO 50-219/74/23:on 740315,isolation Condenser Condensate High Flow Sensors Actuated at Setpoints Above Tech Specs Limits.Caused by Lack of Sensor Repeatability.Procedures Being Revised to Reflect Setpoint Changes
ML20003C390	22 March 1974	AO 50-219/74/21:on 740313,bypass Valve RE22D Opened,Causing Main Steam High Flow Sensor RE22D to Be Inoperable.Caused by Incorrect Valve Positioning.Instrument Technicians to Be Advised Re Critical Importance of Valve Lineup Checks
ML20003C391	22 March 1974	AO 50-219/74/22:on 740315,low Pressure Main Steam Line Pressure Switch RE23D Tripped at Pressure Less than Min Required Value of 860 Psig.Caused by Switch Repeatability & Design.Basis for Steam Line Low Pressure Setting Studied	Fuel cladding
ML20003C392	18 March 1974	AO 50-219/74/20:on 740310,MSIVs NS04A & NS04B Failed to Meet Allowable Leakage Requirements.Caused by Faulty Lower Packing Rings Around Valve Shaft.Valves Closed Until 1974 Refueling Outage
ML20003C393	13 March 1974	AO-50-219/74/21:on 740313,bypass Valve RE22D Opened,Causing Main Steam High Flow Sensor RE22D to Be Inoperable.Cause Under Investigation.Instrument Technicians to Be Advised Re Critical Importance of Valve Lineup Checks
ML20003C394	8 March 1974	AO 50-219/74/17:on 740307,power Operation Continued W/Sb Startup Transformer Unavailable for Svc for Time Period Greater than Tech Specs Limits.Caused by Failure of Cam Switch Contacts.Corrective Action to Be Determined
ML20003C395	7 March 1974	AO 50-219/74/15:on 740228,torus to Drywell Breaker Failed to Demonstrate Operability During Weekly Testing.Caused by Design Error Resulting in Excess Friction in Valve Hinge Pins.Valve Locked in Closed Position Pending Solution
ML20003C397	1 March 1974	AO 50-219/74/14:on 740222,two Torus to Drywell Breakers Failed to Demonstrate Operability During Weekly Surveillance Testing.Caused by Excess Friction in Valve Hinge Pins.Valves Freed Immediately W/Repetitive Opening & Closing Movements
ML20003C399	27 February 1974	AO 50-219/74/13:on 740218,cleanup Sys Ac Isolation Valve V-16-1 Inoperable W/Reactor Critical & Coolant Temp Above 212F.Caused by Inadvertent Opening of Valve V-16-1 Breaker. Breaker re-energized & Painting Contractor Personnel Warned
ML20003C400	25 February 1974	AO 50-219/74/12:on 740215,low Pressure Main Steam Line Pressure Switches RE23A & B Tripped at Pressures Less than Min Required Value of 860 Psig.Caused by Design Error. Investigation in Progress & Tech Specs Change May Follow	Fuel cladding
ML20003C401	25 February 1974	AO 50-219/74/11:on 740215,four Torus to Drywell Vacuum Breakers Failed to Demonstrate Operability During Weekly Surveillance Testing.Caused by Excess Friction in Valve Hinge Pines.Valves Freed W/Opening & Closing Movements
ML20003C402	14 February 1974	AO 50-219/74/10:on 740208,low Pressure Main Steam Line Pressure Switches RE23A,C & D Tripped at Pressure Less than Min Required Value of 860 Psig.Caused by Design Error & Sensor Drift.Investigation of Setpoint Drift in Progress	Fuel cladding
ML20003C403	6 February 1974	AO 50-219/74/9:on 740131,low Pressure Main Steam Line Pressure Switches RE23A & D Tripped at Pressures Less than Specified Value.Caused by Design Error & Unusual Svc Conditions.Study Re Basis for Specified Setting in Progress	Fuel cladding
ML20003C721	18 March 1974	Ao:On 740309,during Shutdown to Perform Maint on Six Torus to Drywell Vacuum Breaker Valves,Recirculation Loop Temp Recorder Indicated 160 F,Then Jumped to 250 F When Bumped. Caused by Equipment Malfunction & Operator Error
ML20003C722	18 March 1974	AO 50-219/74/18:on 740308,w/plant Shutdown,Insp of Drywell Snubbers Located Three Inoperable & Four Leaking.Caused by Loss of Hydraulic Fluid.Units Replaced W/Identical Snubbers Rebuilt W/Ethylene Propylene Seals	Design basis earthquake
ML20003C723	15 March 1974	AO 50-219/74/17:on 740307,during Routine Plant Shutdown, While Transferring Power from 1B Auxiliary Transformer to SB Startup Transformer,Closing Switch for S1B Breaker Failed. Caused by Component Failure.Switchgears Will Be Checked
ML20003C724	15 March 1974	AO 50-219/74/16:on 740307,while at Steady State Power,During Weekly Surveillance Testing on 14 Torus to Drywell Vacuum Breakers,Four Breakers Failed to Demonstrate Operability. Caused by Excess Friction in Valve Hinge Pins
ML20083Q021	27 February 1973	Ao:On 730212,low Sample Flow Identified in Stack Monitor Sys.Caused by Moisture Freezing in Sample Line at 262-ft Elevation.Line Thawed Out
ML20083Q039	17 January 1973	Ao:On 721229,electromatic Relief Valve Failed to Reset Causing Primary Sys Blowdown Following Reactor Scram.As Result,Three Different Valves Failed to Operate in Intended Manner.Manufacturers & Valve Users Will Be Consulted	Breakaway torque
ML20083R190	24 May 1972	Ao:On 711031,fuel Assembly Jc 359 Found Misoriented,As Result of Investigation of 720506 Incident Where Operator Unable to Position Sipper Head on Control Head 26-07.Visual Insp of Assembly Conducted
ML20084A090	29 October 1973	Ao:On 730915,following Investigation of Excess Letdown Line Leak,Valve 1MOV-1299 Downstream Seat Protruded from Valve Body & Crack Discovered in Upper Portion of Downstream Seat Ring.Cause Unknown.Vendor Notified of Valve Problem
ML20084B712	26 June 1972	Ao:On 720524,essential Svc Motor Generator Set Failed Resulting in Feedwater Control Sys Failure & Reactor Scram. Caused by Dirty Contacts on 2K Relay.Hfa Relay Replaced
ML20084C394	21 October 1974	AO 50-219/74-52:on 741012,main Steam Line Low Pressure Switch RE23A Found to Trip at Pressure Less than Min of 860 Psig.Caused by Switch Repeatability.Ge Supplied Info to Reduce Setpoint
ML20084C419	15 October 1974	Preliminary AO 50-219/74/52:on 741012,main Steam Low Pressure Switch RE23A Found to Trip at Pressure Less than Min of 860 Psig.Caused by Switch Repeatability.Ge Supplied Info to Enable Reduction in Setpoint
ML20084C435	24 October 1974	AO 50-219/74-53:on 741015,stack Gas Sample Sys Discovered Not Functioning Properly While Reactor Not in Isolated Condition.Caused by Excessive Air Flow to Pump Thereby Reducing Vacuum of Filter.Loose Fitting Tightened
ML20084C478	15 October 1974	Preliminary AO 50-219/74-53:on 741014,stack Gas Sample Sys Discovered Not Functioning Properly While Reactor Not in Isolated Condition.Caused by Excessive Air Flow to Pump Reducing Vacuum at Filter.Loose Fitting Replaced
ML20084C505	11 October 1974	AO 50-219/74-51:on 741007,main Steam Line Low Pressure Switches RE23B & C Found to Trip at Pressure Less than Min of 860 Psig.Caused by Switch Repeatability.Ge Supplied Info Re Reduction of Setpoint.Info Being Evaluated	Fuel cladding
ML20084C526	11 October 1974	AO 50-219/74-50:on 741004,cleanup Sys Dc Isolation Valve V-16-14 Failed to Close Electrically.Caused Undetermined. Arc Horn on Contactor 2Bc Replaced
ML20084C545	4 October 1974	AO 50-219/74-49:on 740927,main Steam Line Low Pressure Switch RE23A Found to Trip at Pressure Less than Min of 860 Psig.Caused by Switch Repeatability.Ge Supplied Info to Reduce Setpoint	Fuel cladding
ML20084C557	4 October 1974	AO 50-219/74-48:on 740925,isolation Condensers a & B Inoperable Due to High Flow as Sensed by Condensate Line Break Sensors.Caused by Tripping of Line Break Sensors Due to Effects of Rated Recirculation Flow
ML20084C580	30 September 1974	Preliminary AO 50-219/74-48:on 740927,main Steam Line Low Pressure Switch RE23A Found to Trip at Pressure Less than Min of 860 Psig.Caused by Switch Repeatability.Ge Submitted Info to Reduce Setpoint	Fuel cladding
ML20084C638	26 September 1974	Preliminary AO 50-219/74-48:on 740925,isolation Condensers a & B Isolated Due to False High Flow Indication on Condensate Line Break Sensors.Cause Under Investigaion.Surveillance Testing Performed on All Condensate Line Break Sensors
ML20084C651	23 September 1974	AO 50-219/74-47:on 740912,two Bergen-Paterson Hydraulic Shock & Sway Arrestors on South Core Spray Sys Found Inoperable.Caused by Component Failure.Two Snubbers Replaced W/Units Rebuilt W/Ethylene Propylene Seals	High Radiation Area Earthquake
ML20084C712	16 September 1974	Preliminary AO 50-219/74/47:on 740912,two Bergen-Paterson Hydraulic Shock & Sway Arrestor on South Core Spray Sys Found Inoperable.Caused by Component Failure.Two Snubbers Replaced W/Units Rebuilt W/Ep Seals	Design basis earthquake
ML20084C734	3 September 1974	AO 50-219/74-46:on 740826,one Torus to Drywell Vacuum Breaker Failed to Demonstrate Operability.Caused by Excessive Friction in Valve Hinge Pins.Burring Difficulty Discussed W/Atwood & Morrill Co,Valve Manufacturer
ML20084C751	27 August 1974	Preliminary AO 50-219/74/46:on 740826,one Torus Drywell Vacuum Breaker Failed to Demonstrate Operability.Caused by Excessive Friction in Valve Hinge Pins.Bushing Difficulty Discussed W/Atwood & Morrill Co,Valve Manufacturer
ML20084C786	26 August 1974	Preliminary AO 50-219/74/45:on 740824,commitment to Follow MAPLHGR Limits Violated.Caused by Insufficient Guidance. Reactor Power Reduced by Recirculation Flow to Point Where No MAPLHGR Limits Violated
ML20084C803	19 August 1974	AO 50-219/74-44:on 740809,main Steam Line Low Pressure Switches RE22A,B,C & D Found to Trip at Pressures Less than Min of 860 Psig.Caused by Switch Repeatability	Fuel cladding
ML20084C848	9 August 1974	Preliminary AO 50-219/74/44:on 740809,main Steam Line Low Pressure Switches RE23A,B,C & D Found to Trip at Pressure Less than Min of 860 Psig.Caused by Switch Repeatability. Setpoint Accuracy Being Investigated	Fuel cladding
ML20084C913	2 August 1974	Preliminary AO 50-219/74/43:on 740802,main Steam Line Low Pressure Switch RE23B Found to Trip at Pressure Less than Min of 860 Psig.Caused by Switch Repeatability.Set Point Accuracy & Tolerance Being Investigated by GE	Fuel cladding

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