B17621, Application for Amend to License DPR-21,reflecting Permanently Defueled Condition of Unit 1,Tech Specs Administrative Controls Section as Allowed by Guidance Contained in NRC Administrative Ltr 95-06
SVP-98-358, Summary Rept of Changes,Tests & Experiments Completed, Including SEs Covering Period on 980716-1031.With
HL-2074, Ei Hatch Nuclear Plant - Units 1 & 2 Annual Operating Rept, 1991
BECO-91-136, Application for Amend to License DPR-35,changing Tech Spec 3.5.D.2, RCIC Sys,Under Exigent Circumstances to Provide Limited Extension of 7-day LCO
NLS9100363, Application for Amend to License DPR-46,consisting of Proposed Change 96 to Tech Specs Re Verification of Equipment Operability by Exam of Appropriate Plant Records
05000293/LER-1989-019, :on 890609,RCIC Sys Made Inoperable Per Tech Specs Due to Inoperable Area Temp Switch.Caused by 890514 Surveillance Procedure Signed as Completed W/Unsatisfactory Results.Terminal Block Replaced
05000245/LER-1989-014, :on 890529,reactor Recirculation Pump Seal a Pressure Became Erratic & Containment Pressure Rapidly Increased.Caused by Seal Failure Due to Damage to Seal Internals.Investigation Into Causes Continuing
05000259/LER-1989-018-02, :on 890712,determined That Area Coolers for RHR & Core Spray Pumps Possibly Operated W/Degraded Flow Rates. Caused by Lack of Procedure/Program Re Flow Rate Measuring. Maint Requests Written
05000331/LER-1986-019, :on 860922,250-volt Dc Battery Declared Inoperable.Caused by Degradation of Positive Plates Due to Galvanic Reaction Resulting from Impurities in Plate Weld Matls.Battery Tested & 16 Cells Replaced
05000331/LER-1986-024, :on 861121,HPCI Sys Isolation Valve Closed Due to Signal from HPCI Steam Line High Flow Pressure Differential Indicating Switch PDIS2245.Caused by Moisture Shorting Out Terminals in Switch
05000321/LER-1988-012-01, :on 880826,HPCI Sys Declared Inoperable Due to Malfunctioning Sys Flow Controller.Caused by Loose Fastener on Intermediate Gear in Gearing Mechanism of Controller. Gear Placed in Gear Train
05000331/LER-1985-043, :on 851104,HPCI Sys Taken Inoperable to Work on Packing Leak on Outboard Steam Supply Isolation Valve.Valve Repaired & Sys Declared Operable.Further Valve Repair Will Be Performed in Near Future
05000271/LER-1996-006, :on 960214,potentially Inoperable RHR Svc Water Valves Noted.Caused by mfg-fabrication Deficiency.Priority Work Orders Written to Inspect & Torque Bolts on Valves.W/
05000293/LER-1992-015, On 921125,RCIC Became Inoperable & 7-day LCO Entered.Caused by Turbine Trip Throttle Valve Closing When Valve Linkage Accidently Contacted.Valve Manually Reset & Personnel Counseled & Instructed
05000293/LER-1992-010, :on 920818,RCIC Removed from Svc & Made Inoperable to Repair Area Temp Switch Terminal Block Termination Point.Caused by Repeated Torquing of Terminal Screw.Terminal Replaced & Circuitry Tested
05000298/LER-1996-005, :on 960509,partial Group 5 Containment Isolation Received Causing RCIC-MOV-MO15 to Close Due to Personnel Error.Procedures That Require Removal of Sensitive Relay Covers for Monitoring Will Be Revised
05000331/LER-1995-012, :on 951212,HPCIS Turbine Manually Tripped Following Receipt of Low Flow Alarm During Testing.Installed Temporary Instrumentation on HPCI Turbine Control Sys
05000293/LER-1992-003, :on 920325,RCIC Sys Declared Inoperable.Caused by Motor Operator Disconnected from Valve Yoke.Personnel Provided one-time Torque Checking Requirements
05000331/LER-1984-012, :on 840229,during HPCI Surveillance Testing, HPCI Turbine Stop Valve Failed to Open After Auxiliary Oil Pump Started.Hpci Declared Inoperable.Caused by Faulty Automatic Depressurization Sys Reset Switch
05000293/LER-1995-006, :on 950614,RCIC Sys Made Inoperable for Troubleshooting Problem W/Turbine Steam Supply Valve.Caused by Either Loosened wire-connector or Failed Auxiliary seal- in Relay.Relay Replaced & Wires Checked
05000293/LER-1991-025, :on 911030,RCIC Sys Turbine Tripped as Operators Started Sys for Reactor Vessel Water Level Control.Caused by Mechanical Overspeed Trip & Inverter Trip.Operator Counseled & Trip Reset
05000265/LER-1991-012-05, :on 911007,spurious Actuation of Electromagnetic Relief Valve Occurred & Pilot Valve for Relief Valve Found Stuck Open.Caused by Binding in Pilot Valve.Valve Internals Replaced
05000293/LER-1991-021, :on 911009,RCIC Declared Inoperable Due to Lack of Sufficient Battery Charger Test Data.Caused by Unavailability of Backup Battery Charger.Alarm Response Procedure for Alarm Window I4 Changed
05000331/LER-1983-038-03, /03L-0:on 830920,HPCI Turbine Vacuum Pump 1P-233 Motor Discovered Arcing.Probably Caused by Accumulated Oil on Motor Commutator.Motor Cleaned & Commutator Resurfaced
05000260/LER-1983-049-03, /03L-0:on 830725,while Performing Surveillance Instruction 4.2.B-60,core Spray Ne Room Cooler Fan Would Not Operate.Caused by Tripped Overload Relays in Full Voltage Nonreversing Magnetic Starter.Relays Replaced
05000293/LER-1991-004, :on 910319,RCIC Sys Made Inoperable Due to Area Temp Switch Terminal Stripped During Quarterly Functional Test & Calibr.Caused by Repeating Torquing of Screws. Terminal Replaced W/Spare
05000331/LER-1982-056-01, /01T-0:on 820912,HPIC Area Steam Leak Alarm Activated by Temp Differential Switch TD8-2260A,resulting from Leak Due to Temp Difference Between Ventilation Intake & Exhaust.Caused by False Signal Due to Resistor Failure
05000293/LER-1993-021, :on 930824,unplanned Automatic Actuation of RCIC Portion of PCIS Occurred Due to RCIC Turbine Steam Supply Line High Flow Signal.Personnel Will Evaluate Setpoint for RCIC Sys High Steam Flow
05000331/LER-1982-022-03, /03L-0:on 820305,HPCI Declared Inoperable When Preliminary Design Review Did Not Confirm Loose Mounting Plate on Spring Can Hanger EBB-14-H8.Caused by Degraded Condition of Red Head Concrete Expansion Bolts
05000293/LER-1993-015, :on 930630,HPCI Sys Declared Inoperable Due to Indicated Flow During Surveillance.Caused by Foreign Matl That Plugged Portion of Restricting Orifice.Restricting Orifice Removed,Cleaned & Reinstalled
05000293/LER-1993-007-01, :on 930317,automatic Closing of RCIC Sys Turbine Steam Supply Isolation Valves Occurred Due to High Steam Flow Signal.Increased Frequency of Valve Testing from Monthly to Weekly
05000293/LER-1993-013, :on 930530,RCIC Sys Declared Inoperable & 7 Day TS 3.5.D.2 LCO Entered Due to Speed Oscillations Which Occurred After Several Minutes of steady-state Operation. Caused by Actuator Failure.Actuator Replaced
05000321/LER-1981-138-03, /03L-0:on 811220,during HPCI Rated Flow Test at steady-state 97% Thermal Power,Hpci Auxiliary Oil Pump Cycled on & Off W/Erratic Movement of Stop Valve.Caused by Dirty Contacts on seal-in Relay.Contacts Cleaned
05000293/LER-1993-007, :on 930317,automatic PCIS Group 5 Actuation Occurred While Attempting to Place RCIC Sys in Standby Svc. Root Cause of Event Unknown.Suppl to LER Will Be Submitted Following Completion of Investigation
05000293/LER-1993-002, :on 930225,RCIC Sys Declared Inoperable During Surveillance Testing.Caused by Galling of Valves Stem & Bonnet Chamber.Valve Stem & Bonnet Chamber Will Be Replaced & Parts Will Be Purchased Following Design
05000321/LER-1981-102, Forwards LER 81-102/03L-0.Detailed Event Analysis Encl
05000321/LER-1981-102-03, /03L-0:on 810914,oil Leak Developed on Oil Sys. Caused by Torn Diaphragm on HPCI Robert Shaw Control Valve Resulting from Component Defect in Valve.Valve Replaced & New Diaphragm Installed
05000331/LER-1981-034-01, /01T-0:on 810915,HPCI Inboard Steam Supply Isolation Valve MOV 2238 Closed.Caused by Personnel Error Due to Incorrectly Placed Test Jumper.Valve Closure Annunciated & Immediate Action Taken to Restore Sys
05000271/LER-1994-005, :on 940330,fire Suppression Water Supply Sys Declared Inoperable.Caused by Inadequate Design of cross- Connection Portion of Svc Water Sys & Inadequate Procedures. Valve SW-8 Tagged Shut to Prevent re-opening
05000321/LER-1981-088-03, /03L-0:on 810811 & 18,oil Leaks Discovered on HPCI Oil Sys.Caused by Ruptured Diaphragm on Diaphragm Control Valve.Diaphragm Replaced
05000321/LER-1981-050-03, /03L-0:on 810612,while Performing RHR Valve Operability,Containment Spray Isolation Valve B Found Inoperative.Caused by Incorrect Installation of Motor Pinion Gear.Motor Pinion Gear Reinstalled
05000321/LER-1981-048-03, /03L-0:on 810702,HPCI Isolated on High Steam Line Flow.Caused by Switch Failure Due to Loss of Internal Damping.Switch Replaced,Recalibr & Returned to Svc.Hpci Proven Operable
05000321/LER-1981-051-03, /03L-0:810607,turbine Failed to Trip at Less than or Equal to 5,000 Rpm During Testing.Caused by Broken Turbine Trip Ball,Scored Trip Piston & Out of Calibr Diaphragm Oil Control Valve.Ball Replaced & Valve Cleaned
05000254/LER-1981-006-03, /03L-0:on 810302,flexible Air Line to Target Rock Main Steam Safety/Relief Valve Found Broken During Routine Insp of Drywell.Caused by Improper Installation of Flexible Air Line.Air Line Replaced W/Longer One
05000277/LER-1980-029-01, /01T-0:on 801113,reactor Core Isolation Cooling Sys Declared Inoperable.Caused by Turbine Trip Valve Switch Being Out of Adjustment.Switch Readjusted & Tested
05000265/LER-1980-011-03, /03L-0:on 800420,while Performing Manual Operation of Relief Valves,Valve 2-203-3C Failed to Open.Caused by Component Failure Due to Excessive Solenoid Plunger to Pilot Valve Stem Clearance
05000254/LER-1980-015-03, /03L-0:on 800511,during Manual Operation of Relief Valves,Valve 1-203-3B Failed to Open.Hpci & Other Valves Operable.Caused by Dirty Contact on Valve Operator hold-in Coil Switch.Switch Replaced & Valve Returned to Svc 80051
05000259/LER-1980-042-03, /03L-0:on 800512,w/unit at 96% Power,Core Spray Sys 1 Room Cooler Failed.Caused by Apparent Malfunction of Check Valves in Header.Check Valves Removed,Inspected & Reinstalled
05000293/LER-2004-004, Re RCIC System Declared Inoperable During Surveillance Testing Due to Flow Controller Potentiometer Oxidation
05000321/LER-1981-127-03, /03L-0:on 811126,during Test,Turbine Failed to Trip Electrically & HPCI Sys Declared Inoperable.Caused by Failed HPCI Electrical Trip Solenoid Valve Due to Continuous Activation During Previous Outage.Coil Replaced
05000321/LER-1982-012-03, /03L-0:on 820211,HPCI Auxiliary Oil Pump Failed to Perform During Procedure HNP-1-3318,HPCI, Hydraulic Oil Piping Moisture Protection. Cause Not Positively Identified.Suspected Components Replaced
05000298/LER-1996-003, :on 960320,single Train RCIC Sys Inoperable Due to Equipment Malfunction.Specific Cause of Failure Could Not Be Determined.Malfunctioning EGM Control Box Was Replaced
05000277/LER-1991-034, :on 911021,TS Violation Occurred When Mode Switch Was Placed in Startup Position W/Rcic Sys Inoperable & on 911022,RCIC Flow Controller Output Signal Identified to Be 0% Instead of 100%
05000271/LER-1994-016, :on 941130,unisolable Svc Water Piping Leaks Resulting in Inoperability of Ws Subsystems & Alternate Cooling Subsystem.Ut Insps Have Been Completed on Similar Piping in SW Sys W/O Other Problems
05000293/LER-1994-004, :on 940803,automatic Primary Containment Isolation Control Sys Actuation Occurred.Caused by Improper Alignment of Control Valve Fulcrum Alignment Pins.Vents Added to Oil Sump & Sys Oil Pressure Reduced