Mercoid
Mercoid# QUERYcdcc4c51dc347810473e7ed293c5fba1
Mercoid# QUERYb8e59f5c84dafeb47a20de33d2a0bdd7
RNP-RA/14-0036, Enclosure to RNP-RA/14-0036: RNP-I/INST-1150, Turbine Low Hydraulic Pressure Trip Setpoint and Uncertainty Calculation
L-PI-21-016, Application for License Amendment to Implement 24-Month Operating Cycle
05000293/LER-1989-014, :on 890412,inadvertent Overpressurization of RCIC Suction Piping Occurred During Surveillance Testing. Caused by Personnel Error.Personnel Trained Re Procedural Changes
05000313/LER-1989-018, :on 890501,reactor Tripped & Inadvertently Jarred Turbine Control Panel Containing Mercoid Switches for Turbine Trip Functions.Caused by Caution Label Missing from Control Panel.Warning Placard Installed
05000424/LER-1987-047, :on 870708,main Turbine Trip Initiated Automatic Reactor Trip.Caused by Spurious Actuation of Temp Switch Tsh 6807.Mercoid Snap Action Switch Installed to Replace Mercury Wet Type Switch
AECM-84-0404, Forwards Evaluation of High Energy Line Breaks & Consequential Control Sys Failures Described in IE Info Notice 79-22,in Response to Concerns in Sser 1
A04555, Rev 0 to CA04555, Hydrogen Gas CR Chemical Habitability
A04571, Rev 0 to CA04571, 4 Tons Liquid Carbon Dioxide CR Chemical Habitability
05000295/LER-1986-018-01, :on 860504,reactor Tripped Due to electro-hydraulic Control (EHC) Hydraulic Fluid Pressure Problems.Caused by Drift of Autostart Pressure to Backup EHC Pump.Pressure Switches Replaced & Recalibr
05000416/LER-1988-006, :on 880120,condenser Circulating Water Manway Cover Leaked & Sprayed Water on Hotwell Low Level Switches Causing False Low Hotwell Level Signal.Caused by Slipped Gasket.Gasket Replaced & Glued in Place
05000416/LER-1985-024, :on 850627,reactor Manually Scrammed When Condensate Pumps & Booster Pumps Tripped.Caused by Failure of hi-hi Level Switch.Switch Replaced & All Feedwater Heater Switches Calibr
05000220/LER-1975-004, :on 750212,during Plant Startup,Feedwater Pump 12 Failed to Start.Caused by Broken Linkage on Suction Pressure Switch Due to Vibration.Switch Linkage Replaced
05000220/LER-1976-006, :on 760215,loss of HPCI Component Occurred Due to Apparent Failure of Pump Suction Pressure Switch.Caused by Disconnected Linkage Arm on Mercoid.Arm Reconnected
05000397/LER-1984-026, :on 840321,ionization Detector Activated & Tripped pre-action Sys,Starting Fire Pumps.Pressure Surge Tripped Another pre-action Sys & Lifted Two Deluge Valves for Standby Gas Treatment Trains a & B
05000272/LER-1983-069-03, /03L-0:on 831226,fire Protection Header Pressure Dropped Suddenly Due to Ruptured 4-inch Alarm Valve.Caused by Frozen Water within Valve.New Valve Ordered & Will Be Installed Upon Receipt
05000259/LER-1983-001-03, /03L-0:on 830110,pressure Switch 1-PS-75-7 Found to Have Setpoint of 174 Psi.Tech Specs Require Setpoint to Be 185 + 10 Psi.Caused by Setpoint Drift.Mercoid Switch Recalibr
05000316/LER-1983-007-03, /03L-0:on 830105,during Surveillance Test,Low Pressure Alarm XPA-152 for Emergency Air Supply Found to Be Actuating at Less than 900 Psig.Cause Not Stated.Design Change Submitted to Replace Mercoid Pressure Switch
05000220/LER-1978-037-03, /03L-0 on 781027:test Revealed Trip Setpoint of 26.5 Inches Water on One Vacuum Switch in Vacuum Relief Sys from Pressure Supression Chamber to Rx Bldg.Caused by Instru Drift in a Mercoid Model CP4122 Vacuum Switch
05000265/LER-1990-009-08, :on 900915,HPCI Declared Inoperable Due to Failure of Gland Seal Hotwell Pump
05000219/LER-1981-050, Forwards LER 81-050/03L-0.Detailed Event Analysis Encl
05000220/LER-1981-014-03, /03L-0:on 810429,during Diesel Fire Pump Test, Diesel Auto Started at Lower than Required Setpoint in Fire Sys Header.Caused by Mercoid O-250 Psig Pressure Switch Failure Due to Natural End of Life.Switch Replaced
05000265/LER-1978-036-03, /03L-0 on 781016: 1 Core Spray low-low Level Initation Switch Failed to Trip at Proper Setpoint, Caused by Instru Drift
05000245/LER-1981-032, Forwards LER 81-032/03L-0.Detailed Event Analysis Submitted
05000260/LER-1981-003-03, /03L-0:on 810112,core Spray Pump Discharge Pressure Switch 2-PS-75-16 Found Outside Tech Spec Limits. Caused by Setpoint Drift.Switch Recalibr & Replaced
05000267/LER-1980-057-03, /03L-0:on 801004,PCRV Pressure Exceeded Penetration Interspace Pressure.Caused by Malfunction of Pressure Switch.Pcrv pump-up Terminated & Switch Linkage Retightened & Calibr
05000424/LER-1989-018-01, :on 891002,steam Generator 1 Train a MSIV Failed to Close,Resulting in Automatic Reactor Trip.Caused by Blown Fuse in Control Logic Power Supply.Grounding Corrected & Limit Switch & Fuse Replaced
05000259/LER-1980-046-03, /03L-0:on 800605,during Power Operation,While Performing Surveillance Test,Core Spray Pump Discharge Pressure switch,PS-75-44,exceeded Setpoint.Caused by Instrument Drift.Switch Was Inspected,Calibr & Tested
05000133/LER-1980-001-03, /03L-0:on 800210,during Routine Testing,Fire Water Sys Header Low Pressure Switch Started Fire Pumps at 44 Psig.Caused by Setpoint Drifting Due to Loosening of Setpoint Retainer.Setpoint Was Adjusted
05000133/LER-1979-003-03, /03L-0 on 790513:fire Water Sys Header Low Pressure Switch APS-18 Started Fire Pumps at 41 Psig Instead of 45 Psig.Caused by Drift & Close Differential Setting. Setpoint Adjusted Switch Will Be Replaced
05000255/LER-1987-019-02, :on 870621,diesel Generator 1-1 & 1-2 Inadvertently Actuated While Personnel Attempted to Latch Turbine Generator.Caused by Failure of Autostop Oil Pressure Switch.Sop 8 Revised to Instruct Operations
05000255/LER-1987-023, :on 870621 & 0712,diesel Generators 1-1 & 1-2 Inadvertently Actuated.Caused by Operator Error.Sop 8 Revised to Include Precautionary Statements & Operator Guidance Re Potential for Actuation
05000260/LER-1994-013, :on 941202,Unit 2 Received Full Automatic Scram from 54% Reactor Power.Caused by Mechanical Degradation of Stator Cooling Water Temp Switch.Affected Systems Restored to Operable Status & Temp Switch Replaced Before Restart
05000260/LER-1994-013-01, :on 941202,Unit 2 Scrammed from 54% Power Due to Balance of Plant Equipment Failure.Caused by Mechanical Degradation of Stator Cooling Water Temp Switch. Affected Sys Restored to Operable Status
05000220/LER-1978-006, Re During Steady State Operation, Performance of Surveillance Test IC-75 Found a Trip Setpoint of 22.5 Inches Water on One Vacuum Switch in the Vacuum Relief System from the Pressure Suppression Chamber to the
05000400/LER-1987-047, :on 870804-05,auxiliary Feedwater Actuations Occurred Due to Trips of Main Feedwater Pump 1A.Caused by Discharge Pressure Switches Out of Calibr.Discharge Pressure Switches Recalibr
05000249/LER-1977-039, /03L-0 for Dresden 3 Regarding Setpoint for Reactor Level Switch LIS 3-263-57B Found to Be Above the Technical Specification Limit
05000306/LER-2015-002, Regarding 21 Feedwater Pump Lockout, Unit 2 Reactor Trip Due to Pressure Switch Failure
05000353/LER-2011-002, Regarding Manual Actuation of the Reactor Protection System Due to Stator Cooling Water High Temperature Actuation
05000306/LER-2010-002, For Prairie Island, Unit 2, Regarding Turbine Shutdown Due to Loss of a Main Feed Water Pump That Resulted in a Reactor Scram
RS-13-065, Core Spray/Auto Depress'N System Relay Logic Panel
05000317/LER-1995-005, :on 951109,manual Reactor Trip Occurred.Caused by Failure of Digital Feedwater Control Module FIC-1111. Reviewed Design Engineering Standards & Existing FP 2000 Digital Controllers Are Being Replaced
05000305/LER-1984-007, :on 840420,alarms Indicated That Two Diesel Generators Running.Caused by Electrician Installing Conduit to Turbine Equipment Terminal Box A.Personnel Cautioned