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    "query_string": "[[Category:ABNORMAL OCCURRENCE REPORTS (SEE ALSO LER &amp; RO)]] [[Site::Dresden||Quad Cities||05000000]]",
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	Issue date	Title	Topic
ML20003C386	24 December 1973	Ao:On 731216,during Operation at Steady Load of 734 Mw,Trip Signal Received from Main Steam Line High Flow Sensor DPIS-261-2S.Caused by Personnel Failure to Open Instrument Valve After Surveillance.Valve Opened
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
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
ML20084C391	11 March 1974	Telecopy Message of Ao:On 740309,drywell Equipment Drain Sump in Board Primary Containment Isolation Valve AO-2001/5 Failed to Close During Surveillance.Caused by Faulty Valve Solenoid
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
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
ML20084C924	4 June 1974	Suppl to Ao:On 740301,unit Diesel Tripped Due to Differential Fault.Caused by Design Failure,Allowing Improper Alignment of Fuse Clips.Fuse Clip Holder Door Modified by Adding Threetwist Locks
ML20084D038	23 June 1975	AO 50-237/75-41:on 750613,electromatic Relief Valve 2-203-3C Failed to Operate During Test at Rated Pressure.Apparently Caused by Leaking Seal Rings in Valve.Valves Replaced by Rebuilt Valves & Successfully Tested
ML20084D053	20 June 1975	AO 50-237/75-40:on 750611,five Arrays Exhibited 5% Scram Times Exceeding Tech Specs Limits During 2x2 Array Test. Caused by High Regulated Pressure in Scram Valve Air Header. Regulator Reset to Correct Pressure
ML20084D119	13 April 1976	AO 50-237/75-39A:on 750612,diesel Generator Experienced Starting Failures.Possibly Caused by Two Gouged & Burred Areas on Ring Gear.Ring Gear Repaired
ML20084D141	18 June 1975	AO 50-237/75-39:on 750612,diesel Generator Failed to Start During Surveillance Run.Cause Not Known.Suitable Action to Be Taken When Cause Determined
ML20084D154	14 January 1976	AO 50-237/75-38A Supplementing AO-50-237/75-38 Re Failure of MO-2-1301-2 Valve to Operate.Apparently Caused by Excessive Cycling of Valve.Valve Stem Probably Experienced Metal Fatigue Due to Multiple Actuations
ML20084D177	25 June 1975	AO 50-237/75-58:on 750615,isolation Condensor Outboard Steam Supply Valve MO-2-1301-2 Found W/Bent Stem.Possibly Caused by Combination of Excessive Cycling of Valve 1301-2 & Maladjustment of Limit Switches for Valve Travel
ML20084D191	13 June 1975	AO 50-237/75-37:on 750604,diesel Generator Failed to Start on First Attempt.Cause Undetermined.Suitable Action Will Be Taken When Cause Determined
ML20084D211	3 July 1975	AO 50-237/75-36:on 750606,MSIV-1C 10% Closure Limit Switch Failed.Caused by de-energized 10% Closure Relay.Switch Reassembled W/Less Torque Applied to Switch Contact Assembly Screws.Switch Operated Successfully
ML20084D216	5 June 1975	AO 50-237/75-35:on 750526,explosion Occurred in B Offgas Sys.Cause Not Determined.Load Drop to Minimize Releases Into Bldg Started
ML20084D221	5 June 1975	AO 50-237/75-33:on 750526,torus Level Found to Be Low.Caused by Personnel Error.Water Pumped from Condensate Storage Into Torus Via HPCI Min Flow Line.Importance of Card Tagging Procedures Emphasized
ML20084D225	3 June 1975	AO 50-237/75-32:on 750526,electromagnetic Relief Valve 203-3B Failed to Open During post-maint Testing of Valves. Cause Unknown.Corrective Actions to Be Determined When Cause Discovered
ML20084D239	12 April 1974	Preliminary AO 50-219/74/26:on 740412,emergency Svc Water Pump 52C Failed to Start.Cause Under Investigation
ML20084D378	23 May 1975	AO 50-237/75-25:on 750116,Noshua Silver Duct Tape Dropped Into Reactor Vessel Annulus from Feedwater Sparger Work Platform.On 750516,decision Made to Start Reactor W/O Recovering Tape Rendering Tape Drop Reportable
ML20084D412	30 May 1975	AO 50-237/75-31:on 750522,containment Cooling Svc Water Valve MO-1501-3A Failed to Control Flow During Scheduled Surverillance.Cause Not Determined.Design Mods for Valves Being Evaluated
ML20084D427	30 May 1975	Ao:On 750520,electromagnetic Relief Valve 2-203-3C Failed to Open During Scheduled Surveillance.Caused by Adjustment Problem in Pilot Valve Linkage.Capscrew Out of Adjustment. All Electromagnetic Relief Valves Adjusted
ML20084D432	29 May 1975	AO 50-237/75-29:on 750519,limit Switch Indicating 10% Closure on 1C MSIV Failed During Startup.Caused by Failure to Reinstall 1C Limit Switch & to Perform Tests.Switch Reinstalled
ML20084D441	23 May 1975	AO 50-237/75-28:on 750506,containment Cooling Svc Water Valves MO-1501-3A & 3B Failed to Control Flow During Lpci/ Containment Cooling Logic Test.Caused by Bent Valve Stems. Increased Size Stem Valves on Order
ML20084D660	11 December 1970	Ao:On 701204,MSIVs 1D,2A,2B & 2C Failed to Close During Biweekly Surveillance Testing.Caused by Out of Step Recorder Indexing Mechanism.Recorder Repaired.Thin Film Found on Pilot Valves.Valves Cleaned
ML20084D881	27 May 1975	AO 50-237/75-27:on 750421,control Rod Withdrawn for Friction Testing While Both GE & Util Employees within Direct Line of Sight of Core.Caused by Disregard of Master Procedure & Failure of Testing Procedure to Include Precaution
ML20084D883	23 May 1975	AO 50-237/75-26:on 750415,diesel Generator Starting Air Motors Failed to Start Diesel Engine.Caused by Motor Pinion Gears Jamming Against Teeth of Ring Gear Preventing Proper Engagement.Vendor Suggested Mod to Regulate Pressure
ML20084D888	21 May 1975	AO 50-237/75-34:on 750513,drywell Equipment Drain Sump Pump Discharge Valve AO-2001-5 Failed to Close.Possibly Caused by Dirt on Solenoid Diaphragms.Valve Disassembled & Cleaned & Electric Conduit Insulation Repaired
ML20084E043	21 May 1975	AO 50-237/75-23:on 750511,diesel Generator Overheated After Inadvertent Fast Start & ECCS Inadvertently Initiated. Overheating Caused by Loss of Cooling Water Pump Suction. ECCS Initiation Caused by Valving Out Flow Check Valve
ML20084E046	3 July 1975	AO 50-237/75-22:on 750507,vol Bounded by Valves 2-301-98 & 2-301-99 Exceeded Max Allowable Limits During Local Leak Rate Testing.Caused by Dirty Mating Surfaces of Disc & Seat. Seating Surfaces Cleaned & Valve Returned to Svc
ML20084E048	24 April 1975	AO 50-237/75-21:on 750416,freon Leak Rate Test on Standby Gas Treatment Sys Showed Leakage Rate Past Charcoal Cells Exceeded Tech Spec Limits.Caused by Ripped Sealing Gasket on Charcoal Cell.Torn Gasket Replaced & Cell Reinstalled
ML20084E049	16 April 1975	Telecopy Ao:On 750416,iodine Removal Efficiency of 2/3A Standby Gas Treatment Sys Charcoal Filters Found to Be Less Efficient than Required.No Cause Stated
ML20084E051	15 April 1975	AO 50-237/75-20:on 750405,diesel Generator Failed to Field Flash When Started.Caused by Shorted Capacitor.Capacitor Replaced
ML20084E053	31 March 1975	AO 50-237/75-19:on 750321,secondary Containment Integrity Violated for 3 Minutes.Caused by Misunderstanding Between Security Guard & Shift Foreman.Guard Staff to Be Informed of Problems
ML20084E055	27 March 1975	AO 50-237/75-18:on 750319,diesel Generator Failed to Come Up to Voltage During Testing.Caused by Dirty Contacts on Vs Relay in Field Flashing Circuit of Diesel Generator.Contacts Cleaned & Started Successfully
ML20084E062	27 March 1975	AO 50-237/75-17:on 750317,main Steam Line Low Pressure Switches 261-30A-D Found to Have Low Trip Setpoints.Caused by Instrument Drift.Switch Setpoints Readjusted
ML20084E063	27 March 1975	AO 50-237/75-16:on 750317,diesel Generator Failed to Start. Caused by Failure of Pinion Gears to Engage Ring Gear. Problem Appears to Be in Gear Mfg
ML20084E236	12 March 1975	AO 50-237/75-14:on 750303,crack Found in Weld Between Lines 8503-8 & 1604-18.Caused by Poor Welding Technique.Weld to Be Ground Out & Pipe Reinstalled w/100% Fillet Weld
ML20084E248	10 March 1975	AO 50-237/75-13:on 750228,motor Operated Valve 2-1402-24A on Core Spray Sys Failed to Open on Signal from Control Room. Apparently Caused by Interlocking of Valves Rendering Valve Incapable of Being Manually Opened
ML20084E252	7 April 1975	Rev to AO Re Core Spray Injection Line through-wall Cracks. Proper Locations of Crack Indications in Error on Drawings. Correct Drawings Encl
ML20084E259	21 February 1975	AO 50-237/75-12:on 750209,through-wall Crack Discovered on Line 2-1403-10-A (Core Spray Injection Line to Reactor Vessel).Cause Unknown.Corrective Action Will Be Based on Cause	Time of Discovery
ML20084E363	29 June 1976	Supplemental AO 50-237/75-11A:on 750127,core Spray Injection Line through-wall Cracks Discovered.Stainless Steel Portion of Core Spray Piping from Vessel Nozzle to Second Isolation Valve Replaced w/SA-333 Grade 6 Carbon Steel
ML20084E393	3 February 1975	AO 50-237/75-10:on 750125,two Adjacent Control Blades Inadvertently Withdrawn to Position 48 During Control Rod Drive Overhaul.Caused by Temporary Procedure Change.Nuclear Engineers to Review Procedures Re Control Rod Movement	Shutdown Margin
ML20084E432	7 January 1974	AO 50-237/74-81:on 741228,relay as 284 Failed to Energize After Completion of Jumper Installation.Caused by Improper Installation of Jumper.Relay Replaced.Jumper Reinstalled Properly
ML20084E851	5 October 1970	Telecopy Ao:On 701004,gape Valve 852B Only Opened Halfway. Caused by Loose Stem Nut of Limitorque Operator.Nut Replaced
ML20084E863	14 October 1970	Telecopy Message of Ao:On 701014,gate Valve 851A Failed to Fully Close.Caused by Loose Stem Nut Locking.Lock Tightened & Stem Lubricated
ML20084J112	12 June 1973	Ao:On 730604,during Surveillance Test,Pump 1B of Standby Liquid Control Sys Did Not Obtain Required Flow Rate.Cause Undetermined.Relief Valves RV-1105A & B Reset
ML20084J116	11 January 1973	Ao:On 721222,loss of Flow to Main Chimney Sample Sys Occurred.Caused by Improper Return to Svc Following Isolation of Sample Line.Tech Spec Allows Inoperable Chimney Monitoring Sys Up to 24 H.Not Reportable as AO

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