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 Issue dateTitleTopic
ML19259D04417 August 1979Confirms Ro:On 790817,unplanned Release Occurred of Radioactive Liquid When Turbine Bldg Sump Was Pumped to Settling Pond.Health & Safety of General Public Was Not Affected.Rept Will Be Submitted within 14 Days
ML19261B97027 February 1979RO 79-013/04L-0 on 790223:water Samples Not Obtained for Jan 1979 from Test Wells 1,3 & 4,discharge Canal to North of Ponds & Waste Water Ponds.Omission Due to New Lab Director Not Being Informed of Procedure
ML19296D3211 February 1980RO-80-004/04L-0:on 800124,seawater Samples Were Collected at Six Sample Stations But Analysis Were Improperly Performed. Caused by Malfunctions of Analysis Equipment.Seawater Samples Were Recollected & Analyzed.No Reportable Activity
ML19308D07211 February 1977RO-77-10:on 770204,low Range Overpressurization Protection Circuit Not Armed During Plant Cooldown.Caused by Procedure Used Not Containing Handwritten Temporary Change Re Arming Circuits.Personnel Cautioned to Cross Check W/Master Copy
ML19308D0739 February 1977RO-77-09:on 770203,decay Heat Valves DH4-4 & DHV-41 Failed to Open Upon Remote Actuation During Plant Cooldown.Caused by Personnel Unable to Overcome Valve Drag.Pressure Relief Line Modified
ML19308D08015 July 1977RO-77-67:on 770624,dose Equivalent I-131 Exceeded Tech Specs Limit.Caused by Known Leaking Fuel Pins & Expected Spikes After Reactor Trip.Reactor Coolant Cleaned Up.Reactor Power History of Prior 48 Hrs & Specific Activity Analyses Encl
ML19308D0817 March 1977RO-77-19:on 770215,incorrect Pilot Cells Monitored for Weekly Battery Surveillance Test on 770112 & 0202 & 09. Stickers on Pilot Cells Caused Confusion & Incorrect Cell Monitoring.Surveillance Procedures ModifiedTime of Discovery
ML19308D0868 July 1977RO-77-65:on 770616,emergency Feedwater Pump Inoperable. Caused by Pump Outboard Bearing Failure.No Adverse Safety Effects.Bearing Renewed & Operability Restored
ML19308D0879 February 1977RO-77-08:on 770126 During Mode 3,boron Concentration Found Diluted,Causing Reactivity Insertion During Startup.Caused by Personnel Error in Placing Unborated Mixed Bed Demineralizer on Line.Unit Tagged When Out of Svc
ML19308D0921 July 1977RO 77-59E:on 770609-10,fish Impingement on Intake Screens Exceeded Tech Specs Limits.Caused by Coal Barge in Canal & Dredge Performing Canal Maint
ML19308D0932 March 1977RO-77-18:on 770216,Westinghouse Pressure Transmitter 59PH Failed to Demonstrate post-accident LOCA Performance Capability.Caused by Moisture Leakage in Terminal Box. Transmitters Will Be Replaced W/Rosemount Instruments
ML19308D0962 February 1977RO-77-07:on 761217,HPI Inadvertently Actuated During Trouble Shooting of Emergency Safeguards Actuation Sys.Caused by Design Drawing Showing Incorrect Channel Designation.Design Re Designation of Channel Feed Changed
ML19308D1171 March 1977RO-77-17:on 770207,while Preparing to Enter Mode 4,sodium Hydroxide Was Introduced Into Rcs,Due to Cycling BSV-36 W/ Valves DHV-41,DHV-4 & DHV-3 Open.Caused by Inadequacy in SP-342.SP RevisedBoric Acid
ML19308D13020 June 1977RO-77-53:on 770529,chemical Addition Pumps 3A & 3B Inoperable.Cause Unknown.Evaluation of Event RequestedBoric Acid
ML19308D13328 February 1977RO-77-16:on 770201 Bailey Model ES-170 Remote Temp Indicator RC-4A-TI-2 Found in Error During Surveillance Procedure. Caused by Meter Movement Failure.Meter Movement Replaced & Indicator Calibr
ML19308D13722 June 1977RO-77-54:on 770601,control Rod Drive Sys Failed to Position Regulating Rods Per Auto Demand.Caused by Loose Printed Circuit Card Connector in Rod Drive Programmer.Connector Repaired
ML19308D1467 July 1977RO-77-62:on 770630,eight Hr Time Limit for Reduction to Less than 60% Thermal Power Exceeded.Caused by Personnel Error. Personnel Instructed to Heed Time Limits More Conservatively
ML19308D17320 June 1977RO-77-52:on 770614,possible Unreviewed Safety Question Arose Re Unterminated Sodium Hydroxide Dilution of Reactor Coolant Sys.Injection of Tank Contents Into Sys Could Cause Core Criticality.Manual Isolation Valve Safeguards Imposed
ML19308D18713 June 1977RO 77-51E:on 770509,marsh Grass Metabolism Sampling Deadline Overrun.Caused by Sampling Instrumentation Component Delivery Delay
ML19308D1938 June 1977RO 77-50E:on 770505-06,fish Impingement on Intake Screens Exceeded Tech Specs Limits.Caused by Oil Barge & Strong Tides in Canal
ML19308D20114 June 1977RO-77-49E:on 770606,radwaste Gas Inadvertently Released. Caused by Blown Loop Seal of Waste Gas Decay Tank.Loop Seal re-establishedLoop seal
ML19308D2077 June 1977RO-77-48:on 770515,33-ft Wind Direction Meteorological Monitoring Instrumentation Channel Found Inoperable.Caused by Sensor Failure.Sensor Renewed
ML19308D21525 February 1977RO-77-15:on 770131,during Initial Filling of Feedwater Heaters & Lines,Daily Surveillance Showed Condensate Storage Tank Contained Less than Tech Spec Requirement. Caused by Unusual Drawdown Rate During Initial Fill
ML19308D22118 February 1977RO-77-14:on 770131,facility Station Battery Failed to Meet Acceptance Criteria During Surveillance Procedure.Caused by Personnel Error.Battery Charged & Retested Satisfactorily
ML19308D23218 February 1977RO-77-13:on 770311,wall Mounted Deluge Actuation Station Tripped by Dust Brush During Routine Cleaning Operations. Caused by Personnel Error.Program to Install Protective Covers on Stations Completed
ML19308D23929 June 1977RO-77-57:on 770607 & 09,RCS Leakage Detection Sys Inoperable.Caused by Thermal Condition Causing Carbon Vane Pump Overload & Trip.Request for Engineering Info Submitted for Solution
ML19308D24327 June 1977RO-77-56:on 770602,steam-driven Emergency Feed Pump Failed to Autostart on Main Steam Supply Lineup.Caused by Steam Line Condensation Restraining Throttle Valve.Drain Capacity from Run of Piping Upstream of Valve IncreasedOverspeed trip
ML19308D24516 February 1977RO-77-12:on 770210,during RCS Cleanup After Sodium Hydroxide Injection,Boron Concentration Diluted by 230 Parts/Million. Caused by Personnel Error in Loading Mixed Bed Vice Cation to Demineralizer.Operators Cautioned & Drums MarkedBoric Acid
Shutdown Margin
ML19308D25318 March 1977RO-77-23:on 770302,borated Water Storage Tank Level Reduced Below Tech Spec Requirement During Recovery Process from Turbine Reactor Trip.Caused by Personnel Dropping Pressure Level During RCS Cooldown.Normal Level re-established
ML19308D25422 June 1977RO-77-55:on 770602, a Emergency Diesel Generator Failed to Start for Mechanalysis Run.Cause Unknown.Nuts Tightened on a & Verified on B.Work Request Initiated to Recheck 50% of Nuts on Each Diesel Wk of 770703
ML19308D25527 December 1976RO-76-01:on 761222,Tech Spec 3.3.1.1 Table 3.3-1 Not Adhered to During Control Rod Programing Verification Test.Caused by Personnel Failure to Research All Limits & Precautions Sources.Personnel Cautioned to Use Surveillance Matrix
ML19308D2603 October 1977RO-77-01:on 770101,wall Crack Discovered in Eight Inch Schedule 40 304 Stainless Steel Bldg Spray Pipe Inside Containment Bldg.Caused by Stress Corrosion Cracking Due to Chlorides & Oxygen.Investigation ContinuingStress corrosion cracking
ML19308D2616 July 1977RO-77-61E:on 770626,unplanned Release of Radwaste Gas Occurred Contrary to ETS 5.6.2.A.Cause Being Investigated to Determine Corrective ActionLoop seal
ML19308D26319 April 1977RO-77-30E:on 770324-25,biomass of Fish & Shellfish Impinged on Intake Screens Exceeding Tech Spec Limit.Caused by Barge Traffic,Strong Southwest Winds & Divers Cleaning Submerged Portion of Intake Structure
ML19308D26611 January 1977RO-77-02:on 761220,suction Valve Found Shut During RCS Heatup in Raising Pressure to 150 Psig,As Makeup Pump 3C Was Started.Caused by Failure to Perform Visual Check Before Starting Pump.Operators Cautioned
ML19308D27111 January 1977RO-77-03:on 761229,makeup Pump Suction Valve Closed During Surveillance Test,Causing Makeup Pump 3B to Lose Suction & Seize.Caused by Spurious Valve Closure.Incident Could Not Be Repeated
ML19308D27324 January 1977RO-77-05:on 770103,boric Acid Storage Tank Level Indicator a Found Plugged During Surveillance Insp.Caused by Sensing Line Dip Tube Blocked by Crystallized Boric Acid.Blowdown Capability ModifiedBoric Acid
ML19308D27421 April 1977RO-77-29:on 770416,cooldown Rate in Excess of Tech Spec Limit Occurred During Reactor Shutdown Remote from from Control Ctr.Caused by Pressure Transmitter Out of Calibr. Transmitter Calibr & Trip Feed Pump Procedure Revised
ML19308D2771 July 1977RO-77-60E:on 770613-14,fish Impingement on Intake Screens Exceeded Tech Specs Limits.Caused by Oil Barge in Canal & Dredge Performing Canal Maint
ML19308D27824 January 1977RO-77-04:on 770101,control Switch for Decay Heat Valve 42 Placed in Open Position Permitting Flow Path from RCS to Reactor Bldg Sump During Cycling Demonstration.Caused by Personnel Error.Personnel Cautioned to Follow Procedures
ML19308D27911 April 1977RO-77-28E:on 770318-19,biomass of Fish & Shellfish Impinged on Intake Screens in Excess of Tech Spec Limit.Possibly Caused by Seasonal Event
ML19308D2807 July 1977RO-77-63:on 770615,reactor Bldg Cooling Fan AHF-6A Failed, Rendering Containment Hydrogen Purge Sys Inoperable.Caused by Loose Electrical Connection.No Adverse Safety Effects
ML19308D2817 February 1977RO-77-06:on 770130,wall Crack Discovered in eight-inch Schedule 40-304 Stainless Steel Bldg Spray Pipe Inside Containment Bldg.Caused by Stress Corrosion Cracking Due to Chlorides & Oxygen.Investigation ContinuingStress corrosion cracking
ML19308D2878 July 1977RO-77-64:on 770616,auxiliary Bldg Exhaust Fans Ahf 14A & 14C Inoperable.Caused by Sys Ductwork Vibration Causing Hole Between Fans & Discharge Damper.Laminated Patch Installed to Strengthen Ductwork
ML19308D29112 April 1977RO-77-27:on 770405,purging of Reactor Bldg Occurred W/Reactor Bldg Purge Radiation Monitor Vacuum Pump Inoperable,Contrary to Tech Spec Requirement.Caused by Conflicting Tech Spec Requirements.Tech Specs ConformedGrab sample
ML19308D30230 March 1977RO-77-05:on 770307,B Loop of Hpis Isolated Contrary to Tech Spec During Preplanned Maint on Makeup Valve.Caused by Procedural Requirement.Makeup Valve Repacked & B Loop Restored Operable within 72-h
ML19308D31229 March 1977RO-77-24:on 770307,emergency Feedwater Pump Tripped Due to Overspeed During Main Steam Start Attempt.Caused by Steam Supply Valve Opening Faster than Governor Can Respond. Auxiliary Steam Supplied & Sys Declared OperableOverspeed trip
ML19308D31915 March 1977RO-77-22:on 770308,main Steam Relief Valve MSV-35 Opened at 985 Psig While Operating at 40% Power.Caused by Relief Valve Lifting Due to Setpoint Drift.Main Steam Relief Valve Calibr to Correct Lift Setpoint
ML19308D32214 March 1977RO-77-21:on 770225,main Steam Valve MSV-36 Opened at 990 Psig Following Reactor Trip.Mainsteam Valve Lifted Due to Setpoint Drift.Main Steam Valve Calibr to Correct Lift Setpoint
ML19308D32510 March 1977RO-77-20:on 770302,cooldown Rate in Excess of Tech Spec Limit Occurred Due to Loss of Ics,Causing Reactor Trip, Turbine Trip & Atmospheric Steam Dump Valves to Open.Caused by Output Diode Failure in B Inverter.Diode Renewed