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Issue date | Title | Topic | |
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ML19259D044 | 17 August 1979 | Confirms 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 | |
ML19261B970 | 27 February 1979 | RO 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 | |
ML19296D321 | 1 February 1980 | RO-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 | |
ML19308D072 | 11 February 1977 | RO-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 | |
ML19308D073 | 9 February 1977 | RO-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 | |
ML19308D080 | 15 July 1977 | RO-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 | |
ML19308D081 | 7 March 1977 | RO-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 Modified | Time of Discovery |
ML19308D086 | 8 July 1977 | RO-77-65:on 770616,emergency Feedwater Pump Inoperable. Caused by Pump Outboard Bearing Failure.No Adverse Safety Effects.Bearing Renewed & Operability Restored | |
ML19308D087 | 9 February 1977 | RO-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 | |
ML19308D092 | 1 July 1977 | RO 77-59E:on 770609-10,fish Impingement on Intake Screens Exceeded Tech Specs Limits.Caused by Coal Barge in Canal & Dredge Performing Canal Maint | |
ML19308D093 | 2 March 1977 | RO-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 | |
ML19308D096 | 2 February 1977 | RO-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 | |
ML19308D117 | 1 March 1977 | RO-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 Revised | Boric Acid |
ML19308D130 | 20 June 1977 | RO-77-53:on 770529,chemical Addition Pumps 3A & 3B Inoperable.Cause Unknown.Evaluation of Event Requested | Boric Acid |
ML19308D133 | 28 February 1977 | RO-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 | |
ML19308D137 | 22 June 1977 | RO-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 | |
ML19308D146 | 7 July 1977 | RO-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 | |
ML19308D173 | 20 June 1977 | RO-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 | |
ML19308D187 | 13 June 1977 | RO 77-51E:on 770509,marsh Grass Metabolism Sampling Deadline Overrun.Caused by Sampling Instrumentation Component Delivery Delay | |
ML19308D193 | 8 June 1977 | RO 77-50E:on 770505-06,fish Impingement on Intake Screens Exceeded Tech Specs Limits.Caused by Oil Barge & Strong Tides in Canal | |
ML19308D201 | 14 June 1977 | RO-77-49E:on 770606,radwaste Gas Inadvertently Released. Caused by Blown Loop Seal of Waste Gas Decay Tank.Loop Seal re-established | Loop seal |
ML19308D207 | 7 June 1977 | RO-77-48:on 770515,33-ft Wind Direction Meteorological Monitoring Instrumentation Channel Found Inoperable.Caused by Sensor Failure.Sensor Renewed | |
ML19308D215 | 25 February 1977 | RO-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 | |
ML19308D221 | 18 February 1977 | RO-77-14:on 770131,facility Station Battery Failed to Meet Acceptance Criteria During Surveillance Procedure.Caused by Personnel Error.Battery Charged & Retested Satisfactorily | |
ML19308D232 | 18 February 1977 | RO-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 | |
ML19308D239 | 29 June 1977 | RO-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 | |
ML19308D243 | 27 June 1977 | RO-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 Increased | Overspeed trip |
ML19308D245 | 16 February 1977 | RO-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 Marked | Boric Acid Shutdown Margin |
ML19308D253 | 18 March 1977 | RO-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 | |
ML19308D254 | 22 June 1977 | RO-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 | |
ML19308D255 | 27 December 1976 | RO-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 | |
ML19308D260 | 3 October 1977 | RO-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 Continuing | Stress corrosion cracking |
ML19308D261 | 6 July 1977 | RO-77-61E:on 770626,unplanned Release of Radwaste Gas Occurred Contrary to ETS 5.6.2.A.Cause Being Investigated to Determine Corrective Action | Loop seal |
ML19308D263 | 19 April 1977 | RO-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 | |
ML19308D266 | 11 January 1977 | RO-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 | |
ML19308D271 | 11 January 1977 | RO-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 | |
ML19308D273 | 24 January 1977 | RO-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 Modified | Boric Acid |
ML19308D274 | 21 April 1977 | RO-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 | |
ML19308D277 | 1 July 1977 | RO-77-60E:on 770613-14,fish Impingement on Intake Screens Exceeded Tech Specs Limits.Caused by Oil Barge in Canal & Dredge Performing Canal Maint | |
ML19308D278 | 24 January 1977 | RO-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 | |
ML19308D279 | 11 April 1977 | RO-77-28E:on 770318-19,biomass of Fish & Shellfish Impinged on Intake Screens in Excess of Tech Spec Limit.Possibly Caused by Seasonal Event | |
ML19308D280 | 7 July 1977 | RO-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 | |
ML19308D281 | 7 February 1977 | RO-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 Continuing | Stress corrosion cracking |
ML19308D287 | 8 July 1977 | RO-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 | |
ML19308D291 | 12 April 1977 | RO-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 Conformed | Grab sample |
ML19308D302 | 30 March 1977 | RO-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 | |
ML19308D312 | 29 March 1977 | RO-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 Operable | Overspeed trip |
ML19308D319 | 15 March 1977 | RO-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 | |
ML19308D322 | 14 March 1977 | RO-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 | |
ML19308D325 | 10 March 1977 | RO-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 |