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{
    "query_string": "[[Category:TEXT-SAFETY REPORT]] [[Site::Millstone||Seabrook||05000000||05000471]]",
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	Issue date	Title	Topic
05000000/LER-1950-237, Updated LER 50-237/01L:on 760406,unacceptable Ultrasonic Indication Found on Isolation Condenser safe-end.Caused by Cracks in safe-ends.Cracked safe-end Removed & Sent to Bmcl for Metallographic Analysis	13 July 1976	Updated LER 50-237/01L:on 760406,unacceptable Ultrasonic Indication Found on Isolation Condenser safe-end.Caused by Cracks in safe-ends.Cracked safe-end Removed & Sent to Bmcl for Metallographic Analysis
05000000/LER-1977-005, Updated LER 77-005/1T:on 770114,failure of High Pressure Svc Water/Emergency Svc Water & Emergency Cooling Water Pumps to Meet FSAR Seismic Requirements Noted.Caused by Change in Calculation Techniques	28 January 1977	Updated LER 77-005/1T:on 770114,failure of High Pressure Svc Water/Emergency Svc Water & Emergency Cooling Water Pumps to Meet FSAR Seismic Requirements Noted.Caused by Change in Calculation Techniques
05000000/LER-1986-001, Partially Deleted LER 86-001-00:on 860105,loss of Dynamic Reporting of Vital Door Activity Occurred.Cause & Corrective Action Completely Deleted	10 January 1986	Partially Deleted LER 86-001-00:on 860105,loss of Dynamic Reporting of Vital Door Activity Occurred.Cause & Corrective Action Completely Deleted
05000000/LER-1986-002, Partially Deleted LER 86-002-00:on 860117,loss of Alarm Surveillance on Doors Occurred.Caused by Erroneously Listing Officer as Being Posted on Door 398.Processing of Rev to Physical Security Plan Initiated	23 January 1986	Partially Deleted LER 86-002-00:on 860117,loss of Alarm Surveillance on Doors Occurred.Caused by Erroneously Listing Officer as Being Posted on Door 398.Processing of Rev to Physical Security Plan Initiated
05000000/LER-1986-003, Partially Deleted LER 86-003-00:on 860125,loss of Dynamic Reporting of Vital Area Door Activity Occurred.Caused by Equipment Malfunction.Corrective Action Withheld	29 January 1986	Partially Deleted LER 86-003-00:on 860125,loss of Dynamic Reporting of Vital Area Door Activity Occurred.Caused by Equipment Malfunction.Corrective Action Withheld
05000000/LER-1986-004, Partially Deleted LER 86-004-01:on 860204,loss of Dynamic Reporting of Alarm Surveillance Occurred.Cause Withheld. Computer Svcs Personnel Will Continue to Monitor Sys for Indicators of Cause	11 June 1986	Partially Deleted LER 86-004-01:on 860204,loss of Dynamic Reporting of Alarm Surveillance Occurred.Cause Withheld. Computer Svcs Personnel Will Continue to Monitor Sys for Indicators of Cause
05000000/LER-1986-007, Partially Deleted LER 86-007-01:on 860218,loss of Alarm Surveillance Occurred.Caused by Water Leaking Into Cable Due to Heavy Rain.Cable Dried,Leak Repaired & Design Corrected	6 October 1986	Partially Deleted LER 86-007-01:on 860218,loss of Alarm Surveillance Occurred.Caused by Water Leaking Into Cable Due to Heavy Rain.Cable Dried,Leak Repaired & Design Corrected
05000000/LER-1986-009, Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised	14 April 1986	Ro:On 860312,discovered That LER 2-86-04 & LER 86-009 Not Submitted to Nrc.Caused by Misplaced Repts.Repts Telecopied to Nrc.Procedure for Distribution of Repts Revised
05000000/LER-1986-011, Partially Deleted LER 86-011-00:on 860410,vital Area Intrusion Alarm Failure Occurred.Cause of Event Deleted. Alarm & Door Tested Satisfactorily	15 April 1986	Partially Deleted LER 86-011-00:on 860410,vital Area Intrusion Alarm Failure Occurred.Cause of Event Deleted. Alarm & Door Tested Satisfactorily
05000000/LER-1986-012, Partially Deleted LER 86-012-00:on 860412,breach Discovered in Protected Area Barrier.Caused by Personnel Error. Personnel Counseled	17 April 1986	Partially Deleted LER 86-012-00:on 860412,breach Discovered in Protected Area Barrier.Caused by Personnel Error. Personnel Counseled
05000000/LER-1986-013, Partially Deleted LER 86-013-00:on 860414,vital Area Door W/O Alarm Capability Discovered.Caused by Personnel Error. Personnel Removed from Shift & Vital Area Checked for Unauthorized Personnel W/None Being Found	18 April 1986	Partially Deleted LER 86-013-00:on 860414,vital Area Door W/O Alarm Capability Discovered.Caused by Personnel Error. Personnel Removed from Shift & Vital Area Checked for Unauthorized Personnel W/None Being Found
05000000/LER-1986-014, Partially Deleted LER 86-014-00:on 860421,bomb Threat Received by Security Officer in Security Assembly Room. Cause Not Applicable.Actions Taken to Minimize Station Threat & Investigation Underway	25 April 1986	Partially Deleted LER 86-014-00:on 860421,bomb Threat Received by Security Officer in Security Assembly Room. Cause Not Applicable.Actions Taken to Minimize Station Threat & Investigation Underway
05000000/LER-1986-015, Partially Deleted LER 86-015-00:on 860428,stationary Side of Door Failed to Alarm When Tested.Cause Withheld.Alarm Repaired	2 May 1986	Partially Deleted LER 86-015-00:on 860428,stationary Side of Door Failed to Alarm When Tested.Cause Withheld.Alarm Repaired
05000000/LER-1986-016, Partially Deleted LER 86-016-00:on 860501,vital Area Door Discovered W/O Alarm Capabilities.Caused by Access Control Security Officer Asleep at Post.Determination to Suspend or Discontinue Employment Being Made	6 May 1986	Partially Deleted LER 86-016-00:on 860501,vital Area Door Discovered W/O Alarm Capabilities.Caused by Access Control Security Officer Asleep at Post.Determination to Suspend or Discontinue Employment Being Made
05000000/LER-1986-020, Partially Deleted LER 86-020-00:on 860812,security Sys Experienced Loss of Power.Caused Withheld.Numerous Failures Experienced Until Machine a Designated as Prime.Procedures to Reboot Computers Revised	15 August 1986	Partially Deleted LER 86-020-00:on 860812,security Sys Experienced Loss of Power.Caused Withheld.Numerous Failures Experienced Until Machine a Designated as Prime.Procedures to Reboot Computers Revised
05000000/LER-1986-021, Partially Deleted LER 86-021-00:on 860911,vital Area Doors Failed to Alarm When Tested During Surveillance.Caused by Failure to Report Door Transactions to Host Computer.Central Procesing Unit Board Replaced	15 September 1986	Partially Deleted LER 86-021-00:on 860911,vital Area Doors Failed to Alarm When Tested During Surveillance.Caused by Failure to Report Door Transactions to Host Computer.Central Procesing Unit Board Replaced
05000000/LER-1986-022, Partially Deleted LER 86-022-02:on 861018,potential Undetected Access Into Vital Area Discovered.Caused by Use of Incorrect Procedure.Card Reader Replaced & Tested to Ensure Proper Operation	20 February 1987	Partially Deleted LER 86-022-02:on 861018,potential Undetected Access Into Vital Area Discovered.Caused by Use of Incorrect Procedure.Card Reader Replaced & Tested to Ensure Proper Operation
05000000/LER-1986-023, Partially Deleted LER 86-023-01:on 861023,unauthorized Access Into Vital Area Door Discovered.Caused by Card Reader Malfunction.Malfunctioning Card Reader Replaced.Cause Still Under Investigation	21 November 1986	Partially Deleted LER 86-023-01:on 861023,unauthorized Access Into Vital Area Door Discovered.Caused by Card Reader Malfunction.Malfunctioning Card Reader Replaced.Cause Still Under Investigation
05000000/LER-1986-024, Partially Deleted LER 86-024-00:on 861113,attempted Introduction of Unauthorized Weapon Into Protected Area Discovered.Caused by Personnel Attempt to Enter Plant W/ Concealed Gun.Personnel Denied Facility Access	18 November 1986	Partially Deleted LER 86-024-00:on 861113,attempted Introduction of Unauthorized Weapon Into Protected Area Discovered.Caused by Personnel Attempt to Enter Plant W/ Concealed Gun.Personnel Denied Facility Access
05000000/LER-1986-026, Partially Deleted LER 86-026-00:on 861124,vital Area Door Discovered W/O Alarm Capability.Caused by Personnel Error. Secutiry Officer in Question Terminated & Function of Administrative Sergeant Reviewed	1 December 1986	Partially Deleted LER 86-026-00:on 861124,vital Area Door Discovered W/O Alarm Capability.Caused by Personnel Error. Secutiry Officer in Question Terminated & Function of Administrative Sergeant Reviewed
05000000/LER-1986-030, Partially Deleted LER 86-030-00:on 861211,unauthorized Opening Into Protected Area Discovered.Caused by Area Not Properly Identified as Area for Security Concern.Signs Posted	16 December 1986	Partially Deleted LER 86-030-00:on 861211,unauthorized Opening Into Protected Area Discovered.Caused by Area Not Properly Identified as Area for Security Concern.Signs Posted
05000000/LER-1986-052, Partially Withheld LER 86-052-01:on 860926,security Data Mgt Sys Computer Terminals Became Inoperable (Ref 10CFR73.21). Caused by Overload of Alarms & Sys Instability.Sys Restored by Placing Sys Multiplexers Online	13 November 1986	Partially Withheld LER 86-052-01:on 860926,security Data Mgt Sys Computer Terminals Became Inoperable (Ref 10CFR73.21). Caused by Overload of Alarms & Sys Instability.Sys Restored by Placing Sys Multiplexers Online
05000336/LER-1983-007, Updated LER 83-007/01T-1:on 830318,nonconservative Safety Analysis Assumption Discovered in Steam Generator Tube Rupture Analysis.Radiological Consequences of Reanalysis Being Analyzed	9 December 1983	Updated LER 83-007/01T-1:on 830318,nonconservative Safety Analysis Assumption Discovered in Steam Generator Tube Rupture Analysis.Radiological Consequences of Reanalysis Being Analyzed
05000336/LER-1983-012, Updated LER 83-012/03X-1:on 830322 & 26,charging Pump C Shut Down Due to Lost Oil Pressure.Caused by Failed Integral Oil Pump Drive Coupling.Coupling Repaired	12 March 1984	Updated LER 83-012/03X-1:on 830322 & 26,charging Pump C Shut Down Due to Lost Oil Pressure.Caused by Failed Integral Oil Pump Drive Coupling.Coupling Repaired
05000336/LER-1983-020, Updated LER 83-020/01X-1:on 830613,2,557 Degraded Tubes Discovered on Steam Generator Tubing.Cause Undetermined. Tubes W/Flaws Less than + or - 40% Through Wall or Eddy Current Probe Restrications repaired.W/840213 Ltr	13 February 1984	Updated LER 83-020/01X-1:on 830613,2,557 Degraded Tubes Discovered on Steam Generator Tubing.Cause Undetermined. Tubes W/Flaws Less than + or - 40% Through Wall or Eddy Current Probe Restrications repaired.W/840213 Ltr
05000336/LER-1987-009	18 July 1990	LER 87-009-02:on 870902,unit Experienced Automatic Reactor Trip Due to Low Steam Generator Level.Caused by Valve Stem Slightly Loose from Valve Plug.Damaged Stem/Plug Assembly replaced.W/900718 Ltr
05000336/LER-1990-008	18 July 1990	LER 90-008-00:on 900620,determined That Grab Sample of Unit Stack Gas Not Taken.Caused by Lack of Communication Between Personnel.Grab Sample Obtained & analyzed.W/900718 Ltr	Grab sample
05000336/LER-1990-009	16 July 1990	LER 90-009-00:on 900617,inadvertent Partial Actuation of Train B of Enclosure Bldg Filtration Sys Occurred.Root Cause Not Determined.No Corrective Actions Recommended Until Further Testing & Troubleshooting performed.W/900716 Ltr	Boric Acid
05000336/LER-1990-010	20 July 1990	LER 90-010-00:on 900621,door Identified in Configuration Not Consistent W/Bechtel Design Drawings During High Energy Line Review.Caused by Lack of Knowledge of Requirements.Double Door reinforced.W/900720 Ltr
05000336/LER-1993-008	2 September 1993	LER 93-008-01:on 930505,declared Charging Pumps Inoperable Due to Low Control Power Voltage.Established Administrative Controls & Installed Interposing Relay within C Charging Pump Control circuit.W/930902 Ltr
05000336/LER-1993-014	13 August 1993	LER 93-014-00:on 930714,discovered Surveillances Procedures Had Not Been Performed within Specified Time Intervals Due to Insufficent Planning.Missed Surveillances Immediately performed.W/930813 Ltr	Missed surveillance
05000336/LER-1993-016	27 August 1993	LER 93-016-00:on 930729,reportability Determination Made Re Analysis for Boron Dilution Event.Caused by Inadequate Review of Results of Boron Dilution in Relation to Plant Operating Conditions.Boron Results revised.W/930827 Ltr	Shutdown Margin
05000336/LER-1993-018	3 September 1993	LER 93-018-00:on 930805,letdown Manual Isolation Valve 2-CH-442 Developed Leak Which Exceeded TS Limits.Root Cause Has Not Been Determined.Valve Replaced & All Code Required Post Intallation Tests Successfully completed.W/930903 Ltr
05000336/LER-1993-019	10 September 1993	LER 93-019-00:on 930812,reactor Trip Occurred Due to Low SG Level.Conducted Shift Briefing of Event to Operating Shift While Assuming Watch.Briefing Included Listed Requirements for Subsequent Specific start-up.W/930910 Ltr
05000336/LER-1997-003, Corrected Page One to LER 97-003-01:on 961216,discovered Discrepancy in Plant Procedure Utilized to Perform Periodic Insp of Fire Protection Sys Smoke Detectors.Caused by Failure to Properly Incorporate Ts.Ts Partially Revised	15 April 1997	Corrected Page One to LER 97-003-01:on 961216,discovered Discrepancy in Plant Procedure Utilized to Perform Periodic Insp of Fire Protection Sys Smoke Detectors.Caused by Failure to Properly Incorporate Ts.Ts Partially Revised
05000423/LER-1990-019	3 July 1990	LER 90-019-00:on 900606,automatic Reactor Trip from Negative Flux Rate Signal Occurred Due to Dropped Control Rod.Caused by Broken Connection in Stationary Coil Power Cable for Rod. Special EOP Performed & Connector replaced.W/900703 Ltr	Rod Drop Event
05000423/LER-1990-021	16 July 1990	LER 90-021-00:on 900607,integrated Leak Rate Test Supply & Exhaust Valve 3HVU*V5 Discovered Unlocked & Opened.Caused by Failure to Use Applicable Procedure for Nonroutine Evolution.Valve Closed & locked.W/900716 Ltr
05000423/LER-1990-022	16 July 1990	LER 90-022-00:on 900618,discovered That Hourly Fire Watch Patrol Had Not Been Established in Battery 4 Inverter Room. Caused by Procedural Deficiency.Hourly Fire Watch Established.Procedures revised.W/900716 Ltr	Hourly Fire Watch Early Warning Fire Detection
05000423/LER-1990-024	20 July 1990	LER 90-024-00:on 900620,control Bldg Isolations Occurred Due to Radiation Monitor Detector Degradation.Other Equipment Not Affected.Degradation Caused Radiation Levels to Exceed High Alarm Setpoint.Detector replaced.W/900720 Ltr
05000423/LER-1990-025	20 July 1990	LER 90-025-00:on 900616,hourly Vice Fire Watch Maintained During Condition That Required Continuous Fire Watch Be Established.Caused by Personnel Error.Continuous Fire Watch Established & Personnel Involved counseled.W/900720 Ltr	Continuous fire watch Fire Watch
05000423/LER-1990-026	25 July 1990	LER 90-026-00:on 900625,Train B Containment Hydrogen Monitor Failed Calibr Surveillance.Caused by Inadequate Engineering Interface Between Facilities Design Organization.Caution Tags Placed on Main Control Board indicators.W/900725 Ltr
05000423/LER-1993-004	31 August 1993	LER 93-004-01:on 930331,RT Occurred Due to electro-hydraulic Control Power Supply Failure.Replaced Faulty Power Supply. W/930831 Ltr
05000423/LER-1993-011	30 August 1993	LER 93-011-00:on 930731,MSSV Lift Setpoint Drift Occurred Due to Unknown Cause.Reduced Setpoint for Power Range Neutron Flux High Trip to 10%.W/930830 Ltr
05000423/LER-1993-012	3 September 1993	LER 93-012-00:on 930805,piece of Plywood Discovered in Train a of Sws.Caused by Inadequate Work Control During 1991 Outage to Repair Sws.Plywood Removed & Increased Attention Being Paid to Matl Exclusion in Critical sys.W/930903 Ltr
05000443/LER-1990-015	20 July 1990	LER 90-015-00:on 900620,turbine Trip W/Reactor Trip Occurred Due to Ground Fault Relay Actuation.Cause Undetermined.Relay Currently Monitored & Causes investigated.W/900720 Ltr
05000443/LER-1990-016	24 July 1990	LER 90-016-00:on 900624,ESF Actuation Occurred Resulting in Containment Ventilation Isolation.Caused by Personnel Error. More Descriptive Labels on Inverters & Power Panels & One Line Drawings to Be Placed on inverters.W/900724 Ltr
05000443/LER-1990-017	27 July 1990	LER 90-017-00:on 900630,discovered That Requirements of Tech Spec 6.11, High Radiation Area, Not Met.Caused by Personnel Error.Operator Counseled Re Consequences of Event & Need for Increased Attention to detail.W/900727 Ltr	High Radiation Area Locked High Radiation Area
05000443/LER-1993-007	27 August 1993	LER 93-007-01:on 930512,electrical Circuits Containing Circuit Protective Devices Were Not Analyzed to Function During Environ Excursions.Caused by Failure to Effectively Communicate.Design Change Will Be developed.W/930827 Ltr
05000443/LER-1993-012	26 August 1993	LER 93-012-00:on 930727,RT Due to Electrical Fault in Solid State Protection Sys Cabinet.Replaced Lamp Test Socket & Circuit Driver card.W/930826 Ltr
05000443/LER-1993-013	30 August 1993	LER 93-013-00:on 930730,determnined That SG Blowdown Sys Containment Isolation Valves Not Being Tested Adequately. Root Cause of Event Under Review.Isolation Function Tested Upon Start of EFW pump.W/930830 Ltr	Missed surveillance

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