LER-1981-018, Forwards LER 81-018/03L-0 |
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| 2631981018R00 - NRC Website |
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Northern States Power Company 414 NicoHet Man Minneapoks. Minnesota 55401 Tebphone (612) 330 5500 Designated Original -
Certified by Epv. Ofc/ Asst Division DRPI July 20, 1981 Mr J G Keppler Of fice of Inspection & Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Operation of Reactor Water Cleanup System With Inoperable Isolation Valve
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The Licensee Event Report for tt is occurrence is reproduced on the back of this letter.
Enclosed are three copies.
This event is reported in compliance with Technical Specification 6.7.B.2.c.
Inadequate proc Jural controls resulted in failure to recognize the Technical Specification requirements applica le b
to this particular inoperable valve.
uJ WN L 0 Mayer, PE Manager of Nuclear Support Services
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J W Ferman x
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- - over-St; 8107280174 810720 PDR ADOCK 05000263
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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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