Similar Documents at Zion |
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LER-1979-090, Forwards LER 79-090/01T-0 |
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| 2951979090R00 - NRC Website |
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A Commonwealth Edison Zion Generating Station Shiloh Blvd. & Lake Michigan Zion,lilinois 60099 Telephone 312/746-2084 November 20, 1979 Mr. Harold R.
Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Reference:
Zion Generating Station Docket No. 50-295/DPR-39 Technical Specification, Section 6.6.2
Dear Mr. Denton:
Enclosed please find Reportable Occurrence Report No.
50-295/79-90 for Zion Generating Station.
This occurrence was repori.ed to Region III, Directorate of Regulatory Oper-ations by telephone on 11/20/79 and by telegram /mailgram on 11/20/79.
This report is submitted to you in accordance with the requirements of the Technical Specifications, Section 6.6.2.a.8 which states that errors discovered in the transient or acci-dent analyses or in the methods used for such analyses as described in the safety analysis report or in the bases for the technical specifications that have or could have permitted reactor operation in a manner less conservative than assumed in the analyses require a 14 day written report.
Very truly yours,
~
. / t. w e-L ( -
N.'E.Wandke Superintendent Zion Station NEW/PCL/sh
Enclosure:
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| 05000304/LER-1979-001-01, Has Been Voided | Has Been Voided | | | 05000295/LER-1979-001, Has Been Voided | Has Been Voided | | | 05000304/LER-1979-002, Forwards LER 79-002/03L-0 | Forwards LER 79-002/03L-0 | | | 05000295/LER-1979-002, Forwards LER 79-002/03L-0 | Forwards LER 79-002/03L-0 | | | 05000304/LER-1979-002-03, /03L-0 on 790107:during Surveillance,Bus 238 Transformer Feed Failed to Auto Reclose When re-energized. Caused by Dirty Relay Contacts | /03L-0 on 790107:during Surveillance,Bus 238 Transformer Feed Failed to Auto Reclose When re-energized. Caused by Dirty Relay Contacts | | | 05000295/LER-1979-002-03, /03L-0 on 790108:blower of 1RE-0011,containment Vent Particulate Monitor,Tripped.Caused by Fuse Failure in Control Room Monitor | /03L-0 on 790108:blower of 1RE-0011,containment Vent Particulate Monitor,Tripped.Caused by Fuse Failure in Control Room Monitor | | | 05000295/LER-1979-003, Forwards LER 79-003/01T-0 | Forwards LER 79-003/01T-0 | | | 05000295/LER-1979-003-01, /01T-0 on 790109:Westinghouse Results of Feb 1978 ECCS Model Analysis Determined That Fq Limit Should Be 1.86 Rather than the Current Limit of 2.02.Plant Operations Modified to Adhere to New Limit | /01T-0 on 790109:Westinghouse Results of Feb 1978 ECCS Model Analysis Determined That Fq Limit Should Be 1.86 Rather than the Current Limit of 2.02.Plant Operations Modified to Adhere to New Limit | | | 05000304/LER-1979-003, Has Been Voided | Has Been Voided | | | 05000295/LER-1979-004, Forwards LER 79-004/03X-l | Forwards LER 79-004/03X-l | | | 05000295/LER-1979-004-03, /03X-1 on 790112:inverter 114 Tripped & Could Not Be Reset;Hot Shutdown Not Reached within 4-h.Caused by Loose Contact in DC Breaker & Personnel Error in Late Start of Shutdown.Breaker Will Be Fixed,Personnel Reinstructed | /03X-1 on 790112:inverter 114 Tripped & Could Not Be Reset;Hot Shutdown Not Reached within 4-h.Caused by Loose Contact in DC Breaker & Personnel Error in Late Start of Shutdown.Breaker Will Be Fixed,Personnel Reinstructed | | | 05000304/LER-1979-004-03, /03L-0 on 790109:during Normal Operation,Unit 2 Component Cooling Monitor 2RE0017 Failed Low,Intermittently Alarming in Control Room.Caused by Faulty Low Voltage Supply (Aul Instruments Model PSD-15) | /03L-0 on 790109:during Normal Operation,Unit 2 Component Cooling Monitor 2RE0017 Failed Low,Intermittently Alarming in Control Room.Caused by Faulty Low Voltage Supply (Aul Instruments Model PSD-15) | | | 05000304/LER-1979-004, Forwards LER 79-004/03L-0 | Forwards LER 79-004/03L-0 | | | 05000295/LER-1979-005-03, /03L-0 on 790115:penetration Sys Zone 2 Pressure Fell Below 41 Psig & Zone Flow Pegged High.Caused by Leak in Outer Purge Valves Pratt 42 Inch Butterfly Valves & Model RIA8 Ps Offset Disc During Cold Weather | /03L-0 on 790115:penetration Sys Zone 2 Pressure Fell Below 41 Psig & Zone Flow Pegged High.Caused by Leak in Outer Purge Valves Pratt 42 Inch Butterfly Valves & Model RIA8 Ps Offset Disc During Cold Weather | | | 05000295/LER-1979-005, Forwards LER 79-005/03L-0 | Forwards LER 79-005/03L-0 | | | 05000304/LER-1979-005, Has Been Voided | Has Been Voided | | | 05000295/LER-1979-006-01, /01T-0 on 790202:addition of Too Much Boron Caused Temp Average to Drop Below 540 F.Caused by Inadequate Procedures Specifying When High Steam Flow Safety Injection Can Be Blocked.Procedures Clarified | /01T-0 on 790202:addition of Too Much Boron Caused Temp Average to Drop Below 540 F.Caused by Inadequate Procedures Specifying When High Steam Flow Safety Injection Can Be Blocked.Procedures Clarified | | | 05000295/LER-1979-006, Forwards LER 79-006/01T-0 | Forwards LER 79-006/01T-0 | | | 05000304/LER-1979-006-01, Has Been Voided | Has Been Voided | | | 05000295/LER-1979-007-03, /03L-0 on 790204:OA Lake Discharge Tank Failed to Close Automatically When Activity Reached Setpoint.Caused by Faulty Electrical Relay.Contacts Cleaned & Relay Card Securely Reconnected.Monitor Functionally Tested & Verified | /03L-0 on 790204:OA Lake Discharge Tank Failed to Close Automatically When Activity Reached Setpoint.Caused by Faulty Electrical Relay.Contacts Cleaned & Relay Card Securely Reconnected.Monitor Functionally Tested & Verified | | | 05000295/LER-1979-007, Forwards LER 79-007/03L-0 | Forwards LER 79-007/03L-0 | | | 05000304/LER-1979-007-01, Has Been Voided | Has Been Voided | | | 05000304/LER-1979-008-03, /03L-0 on 790209:when Closing MSIV 2D for Steam Generator Cleanup,Valve Began to Close,Then Reopened.Caused by Failure of Both DC Solenoid Valves to Shift When Energized.After Exercise,One Valve Replaced | /03L-0 on 790209:when Closing MSIV 2D for Steam Generator Cleanup,Valve Began to Close,Then Reopened.Caused by Failure of Both DC Solenoid Valves to Shift When Energized.After Exercise,One Valve Replaced | | | 05000304/LER-1979-008, Forwards LER 79-008/03L-0 | Forwards LER 79-008/03L-0 | | | 05000295/LER-1979-008, Forwards LER 79-008/03L-0 | Forwards LER 79-008/03L-0 | | | 05000295/LER-1979-008-03, /03L-0 on 790206:gas Decay Tank Radiation Monitor ORT-PRO2B Alarmed High.High Alarm Would Not Reset.Caused by Failed Transistor on Circuit Board AA70.Transistor Replaced | /03L-0 on 790206:gas Decay Tank Radiation Monitor ORT-PRO2B Alarmed High.High Alarm Would Not Reset.Caused by Failed Transistor on Circuit Board AA70.Transistor Replaced | | | 05000295/LER-1979-009-03, /03L-0 on 780930:quarterly Average Gaseous Release Rate Was Twice Annual Objective But Less than Tech Spec Max. Caused by Reactor Headvent During Refueling & Conservative Quantification Methods | /03L-0 on 780930:quarterly Average Gaseous Release Rate Was Twice Annual Objective But Less than Tech Spec Max. Caused by Reactor Headvent During Refueling & Conservative Quantification Methods | | | 05000295/LER-1979-009, Forwards LER 79-009/03L-0 | Forwards LER 79-009/03L-0 | | | 05000304/LER-1979-009, Forwards LER 79-009/03L-0 | Forwards LER 79-009/03L-0 | | | 05000304/LER-1979-009-03, /03L-0 on 790210:MSIV Partially Opened.Hydraulic Pump Was Reenergized,Causing MSIV to Reclose.Cause Was Combination of Drain Valve Not Opening After MSIV Closure & Open Accumulator Leaking Gas | /03L-0 on 790210:MSIV Partially Opened.Hydraulic Pump Was Reenergized,Causing MSIV to Reclose.Cause Was Combination of Drain Valve Not Opening After MSIV Closure & Open Accumulator Leaking Gas | | | 05000295/LER-1979-010, Has Been Voided | Has Been Voided | | | 05000304/LER-1979-010-03, /03L-0 on 790214:Channel 2LT-460 Greater than 6% from Channel 2LT-461.Caused by Transmitter Had Zero & Span Shifted.Zero Adjustment Made,Transmitter Conservative for High & Low Level Trips | /03L-0 on 790214:Channel 2LT-460 Greater than 6% from Channel 2LT-461.Caused by Transmitter Had Zero & Span Shifted.Zero Adjustment Made,Transmitter Conservative for High & Low Level Trips | | | 05000304/LER-1979-010, Forwards LER 79-010/03L-0 | Forwards LER 79-010/03L-0 | | | 05000304/LER-1979-011, Has Been Voided | Has Been Voided | | | 05000295/LER-1979-012-01, Has Been Voided | Has Been Voided | | | 05000295/LER-1979-012-99, /99X-0 on 790327:safety Injection Initiated Due to Hi Steam Flow Signal Coincident W/Low Steam Pressure Bistables Tripped for Surveillance Testing.Caused by Setpoint Dropping to 40% During Inadvertent Reactor Trip | /99X-0 on 790327:safety Injection Initiated Due to Hi Steam Flow Signal Coincident W/Low Steam Pressure Bistables Tripped for Surveillance Testing.Caused by Setpoint Dropping to 40% During Inadvertent Reactor Trip | | | 05000295/LER-1979-012, Forwards LER 79-012/99X-0 | Forwards LER 79-012/99X-0 | | | 05000295/LER-1979-014, Has Been Voided | Has Been Voided | | | 05000304/LER-1979-014-01, Cancelled | Cancelled | | | 05000304/LER-1979-016, Cancelled | Cancelled | | | 05000295/LER-1979-017-04, /04T-0 on 790314:boron Usage Exceeded Tech Spec Limits Between 790310 & 14.Caused by Drummed Radioactive Waste Consisting of Borated Water.Usage Has No Bearing on Water Quality Program | /04T-0 on 790314:boron Usage Exceeded Tech Spec Limits Between 790310 & 14.Caused by Drummed Radioactive Waste Consisting of Borated Water.Usage Has No Bearing on Water Quality Program | | | 05000295/LER-1979-017, Forwards LER 79-017/04T-0 | Forwards LER 79-017/04T-0 | | | 05000304/LER-1979-018-01, Cancelled | Cancelled | | | 05000295/LER-1979-019-99, /99X-0 on 790316:inadvertent Safety Injection Occurred from False Steam Pressure Differential Signal in Loop B,Initiated by Waterhammer in 1C Feedwater Line.Caused by False Signal.Asco Solenoid Valve Replaced | /99X-0 on 790316:inadvertent Safety Injection Occurred from False Steam Pressure Differential Signal in Loop B,Initiated by Waterhammer in 1C Feedwater Line.Caused by False Signal.Asco Solenoid Valve Replaced | | | 05000295/LER-1979-019, Forwards LER 79-019/99X-0 | Forwards LER 79-019/99X-0 | | | 05000304/LER-1979-020-01, Cancelled | Cancelled | | | 05000295/LER-1979-021, Cancelled | Cancelled | | | 05000304/LER-1979-022-01, Cancelled | Cancelled | | | 05000295/LER-1979-022, Cancelled | Cancelled | | | 05000295/LER-1979-023, Cancelled | Cancelled | |
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