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| Issue date | Title | Topic | |
|---|---|---|---|
| ML19308D328 | 30 June 1977 | RO-77-58:on 770607,operability of Motor Driven Emergency Feedwater Pump Flow Path Found Not Verified within Time Limit.Caused by Error in Evaluation of Performed SP-349. Shift Supervisors Instructed Re Sp Requirements | |
| ML19308D331 | 13 July 1977 | RO-77-66:on 770620,SP-344 for Nuclear Svcs Closed Cycle Cooling Sys Operability Not Performed within Required Time Frame.Caused by Schedule Change.New Surveillance Schedule Written | |
| ML19308D336 | 19 July 1977 | RO 77-69E:on 770630-0701,fish Impingement on Intake Screens Exceeded Tech Specs Levels.Caused by Dredge Performing Canal Maint | |
| ML19308D343 | 15 July 1977 | RO-77-68:on 770624,reactor Coolant Letdown Not Sampled for Dose Equivalent I-131.Caused by Personnel Error.Time Frequency Info Posted | |
| ML19308D354 | 12 April 1977 | RO-77-26:on 770322,makeup Valve Failed to Open on Manual Hpis Initiation,Contrary to Tech Spec Requirement.Caused by Torque Switch Set Too Low for Consistent Opening of Valve. Torque Switch Reset to Higher Valve | |
| ML19308D367 | 3 June 1977 | RO-77-47:on 770513,regulating Rods,Group 7,out of Specified Limits.Caused by Gate Drive Relay Design Error.Relay Modified | |
| ML19308D379 | 3 June 1977 | RO-77-46:on 770514,hydraulic Snubber MUH-44 Found Inoperable.Caused by Missing Cotter pin.MUH-44 Renewed W/ Functionally Tested Spare Snubber & SP-201 Revealed Other Snubbers Operable | |
| ML19308D393 | 18 May 1977 | Forwards RO-77-44 | |
| ML19308D395 | 18 May 1977 | RO-77-44:on 770427,regulating Rod Insertion Limits Exceeded. Caused by Xenon Buildup & Group 7 Being Fully Inserted. Personnel Instructed to Monitor Rod Index Limits More Closely | |
| ML19308D424 | 17 May 1977 | RO-77-43:on 770427,regulatory Rods Group 7 Found Out of Specified Limits.Caused by Grounded Connector Shield in 24 Volt Programmer.Connector Repaired & Further Investigation Underway | |
| ML19308D429 | 17 May 1977 | RO-77-42:on 770425,monthly Functional Tests Not Performed within Time Frame.Caused by Undistributed Change to Master Surveillance Plan SP-443.Surveillance Schedules Double Checked & Sp Procedural Changes to Be Handled in Timely Way | |
| ML19308D433 | 17 May 1977 | RO-77-41:on 770424,primary Containment Average Air Temp Exceeded 130 F.Caused by Closure of Nuclear Svcs Closed Cycle Cooling Valve SWV-151.Personnel Cautioned Re Unauthorized Manipulation of Valves | |
| ML19308D434 | 2 August 1977 | RO 77-77:on 770907,while in Mode 1,chemical Addition Pumps 3A & 3B Found Inoperable.Pumps Believed to Be Airbound.Vent Valves Installed to Preclude Recurrence | Boric Acid |
| ML19308D435 | 9 August 1977 | RO-77-90:on 770715,decay Heat Valve DHV-4 Failed to Open from Control Room During Quarterly Valve Cycling.Cause Not Determined.Corrective Action Will Be Initiated After Engineering Evaluation | |
| ML19308D436 | 10 August 1977 | RO-77-91:on 770717,reactor Coolant Dose Equivalent I-131 Level Found Contrary to Tech Specs.Caused by Expected Spikes Following Reactor Trip & Known Leaking Fuel Pins.Reactor Coolant Cleaned Via Demineralizers | Power change |
| ML19308D437 | 11 August 1977 | RO-77-92:on 770717,steam Driven Emergency Pump EFP-2 Experienced Overspeed Trip on Autostart.Caused by Condensation in Steam Supply Preventing Fast Throttle Valve Closing.Drain Sys Modified & Steam Bypass Installed | Overspeed trip |
| ML19308D461 | 12 September 1977 | RO-77-105E:on 770901,reactor Bldg Purged Unmonitored Contrary to Ets.Caused by Failure to Ascertain Monitor Operability Prior to Purge Initiation.More Stringent Procedure Adherence Will Be Followed | |
| ML19308D466 | 12 August 1977 | RO 77-93E:on 770729,probable Unplanned Radioactive Gas Release to Auxiliary Bldg Occurred.Caused by Blown Loop Seal on Waste Evaporator.Loop Seal re-established on Each Occurrence | Loop seal |
| ML19308D470 | 9 August 1977 | RO-77-89:on 770715,valve DHV-41 Failed to Open from Control Room During Cycling Surveillance Procedure.Caused by Shift in Torque Switch Setting.Torque Switch Contacts Burnished & Switch Reset | |
| ML19308D471 | 7 November 1977 | RO-77-133E:on 770930-1007,air Inhalation Sample Station C41 Gross Beta Activity Exceeded Control Station Activity.Caused Control Station Activity.Caused by Fallout Due to 770919 Nuclear Weapons Test by Peoples Republic of China | |
| ML19308D475 | 8 November 1977 | RO-77-134E:on 770101-0930,incorrect Procedure Used for Environ Sample Analysis.Caused by Inadequate Procedures, Techniques & Equipment.Procedures Being Revised to Allow Longer Count Times | |
| ML19308D479 | 8 August 1977 | RO-77-88:on 770715,containment Isolation Valve SWV-47 Failed to Close During Quarterly Cycling Procedure SP-370.Caused by Loose Control Wire Connection to Limit Switch.Connection Tightened & Valve Restored to Operable Condition | |
| ML19308D480 | 7 December 1977 | RO-77-141E:on 770101-1031,environ Samples LLDs Exceeded ETS Requirements.Possibly Caused by Natural Activity in Sample.Analysis Procedures Being Revised Enlarging Sample Size & Counting Time | |
| ML19308D486 | 13 September 1977 | RO-77-106E:on 770830,facility Site Load Found Below 70% Level Specified in Ets.Caused by Reduced Sys Load at Night Coupled W/Necessity of Keeping Other Power Stations in Sys at Base Load | |
| ML19308D488 | 19 May 1977 | RO 77-45E:on 770428-29,fish Impingement on Intake Screens Exceeded Tech Specs Limits.Cause Unknown | |
| ML19308D489 | 8 August 1977 | RO-77-87:on 770715,containment Isolation Valve WDV-94 Failed to Operate During Quarterly Cycling Procedure SP-370. Caused by Dirty Limit Switch Contacts.Contacts Cleaned & WDV-94 Operability Restored | |
| ML19308D517 | 8 August 1977 | RO-77-85:on 770715,methyl Iodine Removal Efficiency Found Below Tech Specs Requirements During Reactor Bldg Charcoal Filter Bank Testing.Caused by Deteriorated Charcoal Due to Site Flue Gases & Air Pollutants.Charcoal Replaced 770806 | |
| ML19308D522 | 28 April 1977 | RO-77-32:on 770404,while Reducing Power for Maint,Rod 6 of Group 7 Failed to Move.Caused by Control Rod Drive Mechanism Blown Fuse Due to Control Stator Failure.Stator & Fuse Renewed | |
| ML19308D527 | 25 April 1977 | RO 77-31E:on 770330-31,fish Impingement on Intake Screens Exceeded Tech Specs Limits.Caused by Barge Traffic | |
| ML19308D528 | 28 April 1977 | RO-77-33:on 770406,absolute Position Indicator for Rod 5, Group 8 Failed.Caused by Amphenol Connector Faulty Pin Connection.Connector Repaired & Indicator Restored to Operation | |
| ML19308D550 | 27 April 1977 | RO-77-34:on 770406,Rod 3,Group 2 Dropped Into Core & Quadrant Power Tilt Steady & Transient Limits Exceeded. Caused by Central Rod Drive Mechanism Stator Failure.Stator to Be Renewed | |
| ML19308D552 | 29 July 1977 | RO-77-76:on 770707,auxiliary Bldg Exhaust Fan AHF-14D Failed to Restart After Charcoal Filter Sampling.Caused by AHF-14D Low Flow Switch Shifting Calibr.Switch Calibr & Fan Operability Restored | |
| ML19308D557 | 28 July 1977 | RO-77-75:on 770702,absolute Position Indication for All Regulating Rods Lost While Performing Operability Test on Rod 3 Group 6.Caused by Crowbarred 15 Volt Power Supply Due to Spike of Unknown Origin.Sys Restored | |
| ML19308D576 | 22 July 1977 | RO-77-71:on 770629,absolute Position Indication for Regulating Rod 3 Group 6 Declared Inoperable.Caused by Absolute Position Indicator Tube Failure.Tube Renewed, Aligned & Operability Restored | |
| ML19308E005 | 14 June 1977 | RO 77-49E:on 770606,unplanned Radwaste Gas Release Occurred During Makeup Tank Venting.Caused by Waste Gas Decay Tank Blown Loop Seal,Connected to Waste Gas Low Pressure Header. Seals re-established & Their Surveillance Increased | Loop seal |
| ML19308E118 | 19 April 1977 | RO 77-30E:on 770324-25,biomass of Fish & Shellfish Impinged on Units 1,2 & 3 Intake Screens Exceeding ETS Reporting Level.Possibly Caused by Barge Traffic,Strong Winds & Divers Cleaning Intake Structure | |
| ML19308E125 | 11 April 1977 | RO 77-28E:on 770318-19,biomass of Fish & Shellfish Impinged on Units 1,2 & 3 Intake Screens Exceeding ETS Reporting Level.Event Normal or Seasonal | |
| ML19312D517 | 21 March 1980 | Supplemental RO 80-014/04L-0:on 800221,single Measured Value of Radioactivity Concentration in Critical Pathway Environ Medium Samples Exceeded Control Station Value.Caused by Coal Slag Pile.Pile Relocation Study Underway | |
| ML19317G172 | 5 August 1977 | RO-77-82:on 770712,radiation Monitoring Instrumentation Functional Test SP-335 Time Exceeded Tech Spec Specified Limits.Surveillance Schedule Amended to Meet ASME Section XI Requirements & SP-335 Completed | |
| ML19317G183 | 5 August 1977 | Corrected RO-77-83:on 770712,level a Channel Removed from Svc Due to Disagreement Between a & B Level Channels.Caused by Level Indication Transmitter Calibr Shift.Instrument Calibr & Channel Operability Restored | |
| ML19317G186 | 5 August 1977 | RO-77-83:on 770712,level a Channel Removed from Svc Due to Disagreement Between a & B Level Channels.Caused by Level Indication Transmitter Calibr Shift.Instrument Calibr & Channel Operability Restored | |
| ML19317G189 | 5 August 1977 | RO-77-84:on 770713,discovered That Unit 3 Not Notified of 770706 Unit 1 & 2 Failure.Caused by Personnel Error.Tests Not Meeting Acceptance Criteria Constitute Inoperability. Personnel Instructed in Tech Spec Requirement Procedures | |
| ML19317G192 | 8 August 1977 | RO-77-86:on 770712,SP-511 Acceptance Criteria Not Met by Unit 1 & 2 Batteries While in Mode 1 Operation.Caused by Recording Specific Gravity Prior to Battery Stabilization After Electrolyte Addition | |
| ML19317G205 | 4 August 1977 | RO 77-81E:on 770712,discharge Point Temp Exceeded Tech Spec Limits for More than 3-h.Caused by High Intake Temp & High Power Level.Incident Revealed During 770727 Environ Data Review.Temp Increase Notification Requires Prompt Action | |
| ML19317G213 | 3 August 1977 | RO 77-80E:on 770727,unplanned Radioactive Gas Released to Auxiliary Bldg While in Mode 1 Operation.Caused by Concentrated Waste Storage Tank Blown Loop Seals.Loop Seals re-established & Storage Tank Surveillance Increased | Loop seal |
| ML19317G221 | 3 August 1977 | RO-77-79:on 770708,1 & 4 Vol % Hydrogen Balance Nitrogen Failed to Meet Tech Spec Acceptance Criteria During Gas Chromatograph Calibr.Caused by Separation Column Resolution Loss.Replacement Column Will Be Maintained | |
| ML19317G227 | 3 August 1977 | RO-77-78:on 770711,greater than 15% Per Hour Power Change Completed W/O DE-I 131 Analysis.Caused by Procedural Inadequacy.Operating Procedure Changes Initiated to Ensure Prompt Notification | Power change |
| ML19317G302 | 13 May 1977 | RO 77-40E:on 770421,fish Impingement Sampling Stopped by Clogged Collecting Devices.Caused by Large Accumulation of Ctenophores in Baskets.Effective Filtering Area of Collecting Baskets Increased | |
| ML19317G310 | 5 May 1977 | RO-77-39:on 770421,suction Valves CAV-38 & 46 from Boric Acid Storage Tanks Found Shut.Cause Unknown.Directive Issued Requiring Shift Supervisor Authorization Before Manipulating Process Valves | Boric Acid |
| ML19317G319 | 2 May 1977 | RO 77-38E:on 770413-14,fish Impingement on Intake Screens Exceeded Tech Specs Limits.Caused by Seasonal Changes |