LER-1981-020, Forwards LER 81-020/03L-0 |
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| 2631981020R00 - NRC Website |
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= MAR 011982 Northem States Power Company
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/OI August 24, 1981 EVENT DATE
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INP0 RECV'D.
--Mr J G Keppler -
Of fice of Inspection & Enforcement _
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~U S Nuclear Regulatory Commission
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_ ___799 Roosevelt Road Glen Ellyn, IL 60137] ~ --~
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h=*a MONTICELLO NUCLEAR GENERATING PLANT' "_--
Docket No. 50-263 License No. DPR-22 Leak in 1" Main Steam Drain' The Licensee Event Report for this occurrence is reproduced on -
the back of this letter. Enclosed are three copies.
l This event is reported in co=pliance with Technical Specification
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6.7.B.2.d since abnormal degradation of systems designed to
~ contain radioactive =aterial resulting from the fission process.
occurred.
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L 0 Mayer, PE
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Manager of Nuclear Support Services lcm /TMP/bd cc: Director, IE, USNRC (30)
Director, MIPC, USNRC (3)
NRC Resident Inspector
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Attn: J W Ferman j
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B210150174 810824 l
PDR ADOCK 05000263 I
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| 05000263/LER-1981-001, Forwards Updated LER 81-001/03X-1 | Forwards Updated LER 81-001/03X-1 | | | 05000263/LER-1981-001-03, While Performing Surveillance Test Mo 2035,HPCI Outboard Steam Supply Isolation Valve Failed to Close.Caused by Opened Limitorque SMB-O,240-volt Dc & Torque Switches.Switches Replaced | While Performing Surveillance Test Mo 2035,HPCI Outboard Steam Supply Isolation Valve Failed to Close.Caused by Opened Limitorque SMB-O,240-volt Dc & Torque Switches.Switches Replaced | | | 05000263/LER-1981-016, Forwards LER 81-016/01T-0 | Forwards LER 81-016/01T-0 | | | 05000263/LER-1981-017, Forwards Updated LER 81-017/03L-1 | Forwards Updated LER 81-017/03L-1 | | | 05000263/LER-1981-017-03, While Removing Insulation,Cracks Discovered on 4-inch & 1-inch Reactor Water Cleanup HX Piping,Where Connected to Hx.Caused by Poor fit-up & Welding.Slag Line Removed & Weld Repaired | While Removing Insulation,Cracks Discovered on 4-inch & 1-inch Reactor Water Cleanup HX Piping,Where Connected to Hx.Caused by Poor fit-up & Welding.Slag Line Removed & Weld Repaired | | | 05000263/LER-1981-018-03, /03L-0:on 810620,reactor Water Cleanup Sys Was Returned to Svc Following Maint W/Discharge Isolation Valve MO2399 Open & Inoperable.Caused by Torque Switch Failure. Motor & Torque Switch Replaced & Sys Returned to Svc | /03L-0:on 810620,reactor Water Cleanup Sys Was Returned to Svc Following Maint W/Discharge Isolation Valve MO2399 Open & Inoperable.Caused by Torque Switch Failure. Motor & Torque Switch Replaced & Sys Returned to Svc | | | 05000263/LER-1981-018, Forwards LER 81-018/03L-0 | Forwards LER 81-018/03L-0 | | | 05000263/LER-1981-019-03, /03L-0:on 811022,flow Through B Train Standby Gas Treatment Noted Less than Tech Spec.Caused by Dirt in Tubing from Flow Sensor at Offgas Stack Resulting in Closed Inlet Dampers on Stack Dilution Fans.Tubing Blown Out | /03L-0:on 811022,flow Through B Train Standby Gas Treatment Noted Less than Tech Spec.Caused by Dirt in Tubing from Flow Sensor at Offgas Stack Resulting in Closed Inlet Dampers on Stack Dilution Fans.Tubing Blown Out | | | 05000263/LER-1981-019, Forwards LER 81-019/03L-0 | Forwards LER 81-019/03L-0 | | | 05000263/LER-1981-020-03, /03L-0:on 810724,main Steam Leak Revealed in Drain Line to Condenser.Caused by Piping Leaking Immediately Downstream of 45 Degree Elbow Due to Erosion & Impingement Resulting from Steam & Water Flow from Restricting Orifice | /03L-0:on 810724,main Steam Leak Revealed in Drain Line to Condenser.Caused by Piping Leaking Immediately Downstream of 45 Degree Elbow Due to Erosion & Impingement Resulting from Steam & Water Flow from Restricting Orifice | | | 05000263/LER-1981-020, Forwards LER 81-020/03L-0 | Forwards LER 81-020/03L-0 | | | 05000263/LER-1981-021-01, /01T-0:on 811024,during Cold Shutdown Primary Containment Isolation Sys Logic Relay Coil Failed & Relay Did Not Immediately Trip.Caused by Natural end-of-life. Replaced Relay | /01T-0:on 811024,during Cold Shutdown Primary Containment Isolation Sys Logic Relay Coil Failed & Relay Did Not Immediately Trip.Caused by Natural end-of-life. Replaced Relay | | | 05000263/LER-1981-021, /03L-0:on 811110,during Cold shutdown,4 Channel a Main Steam Line High Flow Switches Found Inoperable.Caused by Heating of Switching Element Due to Relay Coil Failure, Initially Reported in LER 81-021.Elements Replaced | /03L-0:on 811110,during Cold shutdown,4 Channel a Main Steam Line High Flow Switches Found Inoperable.Caused by Heating of Switching Element Due to Relay Coil Failure, Initially Reported in LER 81-021.Elements Replaced | | | 05000263/LER-1981-022-01, /01T-0:on 811030,during Inservice Insp on Core Spray Loop B Safe End to Reducer Weld,Detected Several non- through-wall Crack Indications in HAZ on Reducer.Probably Caused by Igscc.Replaced Reducer & Valve | /01T-0:on 811030,during Inservice Insp on Core Spray Loop B Safe End to Reducer Weld,Detected Several non- through-wall Crack Indications in HAZ on Reducer.Probably Caused by Igscc.Replaced Reducer & Valve | | | 05000263/LER-1981-022, Forwards LER 81-022/01T-0 | Forwards LER 81-022/01T-0 | | | 05000263/LER-1981-023, Forwards LER 81-023/03L-0 | Forwards LER 81-023/03L-0 | | | 05000263/LER-1981-024-01, /01T-0:on 811112,during Maint Shutdown & PM on Hpci,Discovered Abnormal Wear in Woodwear Governor Bracket. Caused by Failed Components Due to Thrust Washer Failure Causing Bushings to Seize to Shaft & Distort Casing | /01T-0:on 811112,during Maint Shutdown & PM on Hpci,Discovered Abnormal Wear in Woodwear Governor Bracket. Caused by Failed Components Due to Thrust Washer Failure Causing Bushings to Seize to Shaft & Distort Casing | | | 05000263/LER-1981-024, Forwards LER 81-024/01T-0 | Forwards LER 81-024/01T-0 | |
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