PNO-III-86-063, on 860702,unidentified Leakage from RCS Discovered.Caused by Leak in Resistance Temp Detector Manifold for Reactor Cooling Loop D.Reactor Cooled to Cold Shutdown.Detector Being Repaired
ML20202D541 | |
Person / Time | |
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Site: | Byron ![]() |
Issue date: | 07/07/1986 |
From: | Forney W, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
To: | |
References | |
PNO-III-86-063, PNO-III-86-63, NUDOCS 8607140156 | |
Download: ML20202D541 (1) | |
Similar Documents at Byron | |
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Category:PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO
MONTHYEARPNO-III-99-041, on 990902,employees at Station Reported Feeling Ground Motion Associated with Earthquake.Plant Staff Checked Plant Sys & Equipment & No Evidence of Damage Was Found1999-09-0303 September 1999
[Table view]PNO-III-99-041:on 990902,employees at Station Reported Feeling Ground Motion Associated with Earthquake.Plant Staff Checked Plant Sys & Equipment & No Evidence of Damage Was Found PNO-III-97-085, on 971009,licensee Identified Gas While Venting Unit 1 Safety Injection Sys Discharge Piping During Monthly Venting Surveillance Test.On 971010,unit 2 Reactor Tripped as Result of Degraded Voltage on Power Supply1997-10-14014 October 1997 PNO-III-97-085:on 971009,licensee Identified Gas While Venting Unit 1 Safety Injection Sys Discharge Piping During Monthly Venting Surveillance Test.On 971010,unit 2 Reactor Tripped as Result of Degraded Voltage on Power Supply PNO-III-89-075, on 891122,startup Process of Reactor Was Terminated When Nuclear Instrumentation Showed That Reactor Was Approaching Criticality Sooner than Anticipated1989-11-21021 November 1989 PNO-III-89-075:on 891122,startup Process of Reactor Was Terminated When Nuclear Instrumentation Showed That Reactor Was Approaching Criticality Sooner than Anticipated PNO-III-89-035, on 890516,unit Shut Down to Repair Hydrogen Leak in Main Generator Stator Water Cooling Sys.Unit Will Be Shut Down for 9 Days for Repairs & Other Maint Activities1989-05-17017 May 1989 PNO-III-89-035:on 890516,unit Shut Down to Repair Hydrogen Leak in Main Generator Stator Water Cooling Sys.Unit Will Be Shut Down for 9 Days for Repairs & Other Maint Activities PNO-III-88-034, on 880406,up to 68 Workers Received Minor Exposures to Airborne Radioactivity,Principally I-131,during Steam Generator Tube Plugging Activities.Cause Under Investigation.Respirators Required to Enter Containment1988-04-0707 April 1988 PNO-III-88-034:on 880406,up to 68 Workers Received Minor Exposures to Airborne Radioactivity,Principally I-131,during Steam Generator Tube Plugging Activities.Cause Under Investigation.Respirators Required to Enter Containment PNO-III-88-029, on 880402,shutdown Begun to Repair Steam Generator Tube Leak.Leakage Rate from RCS Into Secondary Sys Calculated to Be 330 Gallons Per Day.Other Maint & Testing Work Planned in Addition to Investigation & Repair1988-04-0404 April 1988 PNO-III-88-029:on 880402,shutdown Begun to Repair Steam Generator Tube Leak.Leakage Rate from RCS Into Secondary Sys Calculated to Be 330 Gallons Per Day.Other Maint & Testing Work Planned in Addition to Investigation & Repair PNO-III-88-010A, on 880310,licensee Notified Region III That Investigation Into Firewatch Record Discrepancies Completed & Concluded That 51 Watchman Failed to Perform Duties,Per Procedures.Licensee Awarded Contracts to Another Contractor1988-03-11011 March 1988 PNO-III-88-010A:on 880310,licensee Notified Region III That Investigation Into Firewatch Record Discrepancies Completed & Concluded That 51 Watchman Failed to Perform Duties,Per Procedures.Licensee Awarded Contracts to Another Contractor PNO-III-88-010, on 880210,as Result of Ongoing Investigation, 12 Contractor Fire Surveillance Personnel Terminated & 34 Addl Individuals Suspended.Caused by Discrepancies in Electronic Door Entry Records & Workers Records1988-02-11011 February 1988 PNO-III-88-010:on 880210,as Result of Ongoing Investigation, 12 Contractor Fire Surveillance Personnel Terminated & 34 Addl Individuals Suspended.Caused by Discrepancies in Electronic Door Entry Records & Workers Records PNO-III-87-128, on 871002,facility Tripped from 7% Power Due to High Water Level in One of Four Steam Generators,Creating Loss of Offsite Power.Caused by Personnel Error.Licensee Inspecting Damage to Auxiliary Transformer Disconnect Links1987-10-0202 October 1987 PNO-III-87-128:on 871002,facility Tripped from 7% Power Due to High Water Level in One of Four Steam Generators,Creating Loss of Offsite Power.Caused by Personnel Error.Licensee Inspecting Damage to Auxiliary Transformer Disconnect Links PNO-III-87-081, on 870610,earthquake Measuring 5.0 on Richter Scale Occurred Near Lawrenceville,Il.Unusual Events Declared by Six Power Stations But No Damage Observed.Ground Motion Felt at Five Other Plants1987-06-11011 June 1987 PNO-III-87-081:on 870610,earthquake Measuring 5.0 on Richter Scale Occurred Near Lawrenceville,Il.Unusual Events Declared by Six Power Stations But No Damage Observed.Ground Motion Felt at Five Other Plants PNO-III-87-066A, on 870509,piping Elbows & Hangers Damaged by Alleged Water Hammer.Piping Elbows on Each End of 200-ft Run of Main Steam Line Piping Dropped 7 Inches.Indication Found on pipe-to-elbow Weld Downstream of MSIV B.Cause Unknown1987-05-14014 May 1987 PNO-III-87-066A:on 870509,piping Elbows & Hangers Damaged by Alleged Water Hammer.Piping Elbows on Each End of 200-ft Run of Main Steam Line Piping Dropped 7 Inches.Indication Found on pipe-to-elbow Weld Downstream of MSIV B.Cause Unknown PNO-III-87-066, on 870509,during Process of Heating Up Unit Following Refueling Outage,Water Hammer Damaged Main Steam Line 1B Outside Containment.Cause Unknown.Msivs & Bypass Valves Taken Out of Svc & Repairs Started1987-05-11011 May 1987 PNO-III-87-066:on 870509,during Process of Heating Up Unit Following Refueling Outage,Water Hammer Damaged Main Steam Line 1B Outside Containment.Cause Unknown.Msivs & Bypass Valves Taken Out of Svc & Repairs Started PNO-III-87-017, on 870130,facility Received Full Power Ol. Licensee Expects to Go Beyond 5% Power in Early Feb.State of Il Notified1987-01-30030 January 1987 PNO-III-87-017:on 870130,facility Received Full Power Ol. Licensee Expects to Go Beyond 5% Power in Early Feb.State of Il Notified PNO-III-87-007, on 870107,diesel Generator 1A Declared Inoperable.Caused by Potentially Defective Piston Connecting Rod.Spare Rod Taken from Braidwood & Installation & Testing Completion Expected by 8701101987-01-0909 January 1987 PNO-III-87-007:on 870107,diesel Generator 1A Declared Inoperable.Caused by Potentially Defective Piston Connecting Rod.Spare Rod Taken from Braidwood & Installation & Testing Completion Expected by 870110 PNO-III-87-006, on 870109,unit Achieved Initial Criticality. Actual Point of Criticality Consistent W/Point Predicted. Licensee Schedule Calls for Completion of Low Power Testing on 8701211987-01-0909 January 1987 PNO-III-87-006:on 870109,unit Achieved Initial Criticality. Actual Point of Criticality Consistent W/Point Predicted. Licensee Schedule Calls for Completion of Low Power Testing on 870121 PNO-III-86-151, on 861218,during Mode 3,loss of Water & Drop in Pressure Noticed in Accumulator 2D.Caused by Crack in 1-inch Line Used in Filling Accumulator.Cause of Crack Still Unknown.Unit Currently in Mode 4 Pending Repairs1986-12-18018 December 1986 PNO-III-86-151:on 861218,during Mode 3,loss of Water & Drop in Pressure Noticed in Accumulator 2D.Caused by Crack in 1-inch Line Used in Filling Accumulator.Cause of Crack Still Unknown.Unit Currently in Mode 4 Pending Repairs PNO-III-86-138, on 861120,both Component Cooling Water Pumps Tripped,Rendering Sys Inoperable for 12 Minutes.Caused by Pressure Surge Resulting in Lifting of Relief Valve on Excess Letdown HX Line.Line Will Be Removed & Examined1986-11-20020 November 1986 PNO-III-86-138:on 861120,both Component Cooling Water Pumps Tripped,Rendering Sys Inoperable for 12 Minutes.Caused by Pressure Surge Resulting in Lifting of Relief Valve on Excess Letdown HX Line.Line Will Be Removed & Examined PNO-III-86-066, on 860708,three Employees Terminated After Drug Test Revealed Traces of Thc.Employees Listed by Alleger in Late June 1986.Action on Three Individuals Suspended on 860703 Pending1986-07-0808 July 1986 PNO-III-86-066:on 860708,three Employees Terminated After Drug Test Revealed Traces of Thc.Employees Listed by Alleger in Late June 1986.Action on Three Individuals Suspended on 860703 Pending PNO-III-86-063, on 860702,unidentified Leakage from RCS Discovered.Caused by Leak in Resistance Temp Detector Manifold for Reactor Cooling Loop D.Reactor Cooled to Cold Shutdown.Detector Being Repaired1986-07-0707 July 1986 PNO-III-86-063:on 860702,unidentified Leakage from RCS Discovered.Caused by Leak in Resistance Temp Detector Manifold for Reactor Cooling Loop D.Reactor Cooled to Cold Shutdown.Detector Being Repaired PNO-III-86-014, on 860212 & 17,emergency Diesel Generator 2A Failed.Caused by Broken Rocker Arms on Left Cylinders 5 & 7, Respectively.Station Will Be Shut Down for 16 Days While Licensee Investigates Problem1986-02-19019 February 1986 PNO-III-86-014:on 860212 & 17,emergency Diesel Generator 2A Failed.Caused by Broken Rocker Arms on Left Cylinders 5 & 7, Respectively.Station Will Be Shut Down for 16 Days While Licensee Investigates Problem PNO-III-85-073, on 850820,contaminated Resins Used in Condensate Polishing Sys Sent Offsite for Regeneration. Resins Being Returned to Site.No Detectable Radiation Found at Vendor Facility1985-08-21021 August 1985 PNO-III-85-073:on 850820,contaminated Resins Used in Condensate Polishing Sys Sent Offsite for Regeneration. Resins Being Returned to Site.No Detectable Radiation Found at Vendor Facility PNO-III-85-072, on 850815,low Level Contamination Discovered in Filter of truck-mounted Demineralizer Resin Tank Used to Flush Piping.Radioactivity Apparently Concentrated by Flushing Resins.Sludge Returned to Plant for Disposal1985-08-19019 August 1985 PNO-III-85-072:on 850815,low Level Contamination Discovered in Filter of truck-mounted Demineralizer Resin Tank Used to Flush Piping.Radioactivity Apparently Concentrated by Flushing Resins.Sludge Returned to Plant for Disposal PNO-III-85-061, on 850713,reactor Trip Occurred Along W/Loss of Some Instrumentation.Caused by Lightning Strike Near Facility.Methodology Used to Ground Lightning Reviewed.Sys Being Modified to Preclude Recurrence1985-07-19019 July 1985 PNO-III-85-061:on 850713,reactor Trip Occurred Along W/Loss of Some Instrumentation.Caused by Lightning Strike Near Facility.Methodology Used to Ground Lightning Reviewed.Sys Being Modified to Preclude Recurrence PNO-III-85-046, on 850604,while Taking Sample from Vol Control Tank,Valve Packing Failed,Resulting in Release of Approx 700 Mci Xenon & Krypton Gas.Workers Evacuated,Gas Removed by Ventilation Sys & Valve Repaired1985-06-0707 June 1985 PNO-III-85-046:on 850604,while Taking Sample from Vol Control Tank,Valve Packing Failed,Resulting in Release of Approx 700 Mci Xenon & Krypton Gas.Workers Evacuated,Gas Removed by Ventilation Sys & Valve Repaired ML20248F0991978-06-0202 June 1978 PNO-78-118:on 780601,two Iron Workers at Plant Were Injured, When 2 of 26 Support Struts,Forming Base of Cooling Tower Under Const,Collasped & Workers Fell About 75 Ft.Press Release Re Accident Was Issued on 780601 ML20236U3921975-07-30030 July 1975 PN-75-059:licensee Reported That Four Movement Areas in Three Different Locations at Byron Construction Site Have Just Been Discovered.Licensee Requesting Illinois State Geological Survey to Assist in Evaluating Movements 1999-09-03 Category:TEXT-INSPECTION & AUDIT & I&E CIRCULARS MONTHYEARIR 05000454/19990121999-10-0808 October 1999
[Table view]Insp Repts 50-454/99-12 & 50-455/99-12 on 990803-0916.One NCV Occurred.Major Areas Inspected:Operations,Engineering, Maint/Surveillance & Plant Support IR 05000454/19990161999-10-0101 October 1999 Insp Repts 50-454/99-16 & 50-455/99-16 on 990907-10.No Violations Noted.Major Areas Inspected:Radiation Protection & Chemistry Program Included Water Chemistry Control Program & Chemistry Instrument Quality Control Program IR 05000454/19990151999-09-30030 September 1999 Revised Pages Eight Through Eleven to Insp Repts 50-454/99-15 & 50-455/99-15,correcting Inaccuracies with Docket Numbers & Tracking Numbers IR 05000454/19990141999-09-17017 September 1999 Insp Repts 50-454/99-14 & 50-455/99-14 on 990823-27.No Violations Noted.Major Areas Inspected:Physical Security Program ML20211P2001999-09-0808 September 1999 Insp Repts 50-454/99-15 & 50-455/99-15 on 990824-26.No Violations Noted.Major Areas Inspected:Evaluation of Licensee Performance During Exercise of EP PNO-III-99-041, on 990902,employees at Station Reported Feeling Ground Motion Associated with Earthquake.Plant Staff Checked Plant Sys & Equipment & No Evidence of Damage Was Found1999-09-0303 September 1999 PNO-III-99-041:on 990902,employees at Station Reported Feeling Ground Motion Associated with Earthquake.Plant Staff Checked Plant Sys & Equipment & No Evidence of Damage Was Found IR 05000454/19990101999-08-25025 August 1999 Insp Repts 50-454/99-10 & 50-455/99-10 on 990622-0802.No Violations Noted.Major Areas Inspected:Licensee Operations, Maint,Engineering & Plant Support IR 05000254/19990101999-08-20020 August 1999 Insp Repts 50-254/99-10,50-265/99-10,50-454/99-09, 50-455/99-09,50-456/99-10 & 50-457/99-10 on 990628-0721. Major Areas Inspected:Licensee C/A Approach & Implementation of Configuration Control Processes at Each Site IR 05000454/19990081999-07-16016 July 1999 Insp Repts 50-454/99-08 & 50-455/99-08 on 990511-0621.No Violations Noted.Major Areas Inspected:Licensee Operations, Maint,Engineering & Plant Support IR 05000454/19990041999-06-0404 June 1999 Insp Repts 50-454/99-04 & 50-455/99-04 on 990330-0510.No Violations Noted.Major Areas Inspected:Operations,Maint & Surveillance & Plant Support IR 05000454/19990071999-05-28028 May 1999 Insp Repts 50-454/99-07 & 50-455/99-07 on 990517-20.No Violations Noted.Major Areas Inspected:Fire Protection Program,Aspect of Plant Support IR 05000454/19990051999-05-20020 May 1999 Insp Rept 50-454/99-05 on 990401-22.No Violations Noted. Major Areas Inspected:Adequacy of Licensee Programs, Procedures,Equipment & Supporting Documentation for ISI Program IR 05000454/19990061999-05-19019 May 1999 Insp Repts 50-454/99-06 & 50-455/99-06 on 990419-23.No Violations Noted.Major Areas Inspected:Liquid & Gaseous Effluent Program,Radiological Environ Monitoring Program, Auditing Program & Outage Activities IR 05000454/19990031999-04-14014 April 1999 Insp Repts 50-454/99-03 & 50-455/99-03 on 990217-0329. Violations Noted.Major Areas Inspected:Licensee Operations, Maint,Engineering & Plant Support IR 05000454/19990021999-03-10010 March 1999 Insp Repts 50-454/99-02 & 50-455/99-02 on 990105-0216.No Violations Noted.Major Areas Inspected:Licensee Operations, Maint,Engineering & Plant Support IR 05000454/19990011999-02-11011 February 1999 Insp Repts 50-454/99-01 & 50-455/99-01 on 990119-22.No Violations Noted.Major Areas Inspected:Adequacy of Licensee Programs,Procedures,Equipment & Supporting Documentation for Maint of Medium Voltage & Low Voltage Circuit Breakers ML20199H8811999-01-19019 January 1999 Notice of Violation from Insp on 981124-990104.Violation Noted:From 871029 to 981123,test Controls for Stroke Time Testing of AFW Pump Discharge Valves Were Not Properly Established IR 05000454/19980251999-01-19019 January 1999 Insp Repts 50-454/98-25 & 50-455/98-25 on 981124-990104.No Violations Noted.Major Areas Inspected:Licensee Operations, Maint,Engineering & Plant Support IR 05000454/19980241998-12-30030 December 1998 Insp Repts 50-454/98-24 & 50-455/98-24 on 981130-1204.No Violations Noted.Major Areas Inspected:Ro & SRO Requalification Programs,Review of Training Administrative Procedures & Written & Operating Exam Matl IR 05000454/19980201998-12-18018 December 1998 Insp Repts 50-454/98-20 & 50-455/98-20 on 981006-1123.No Violations Noted.Major Areas Inspected:Operations,Maint, Engineering & Plant Support IR 05000454/19980231998-12-17017 December 1998 Insp Repts 50-454/98-23 & 50-455/98-23 on 981116-17.No Violations Noted.Major Areas Inspected:Verification of Adequacy of Training to Plant Operators in Dealing with Fluctuations in Electric Grid Stability IR 05000454/19980221998-12-10010 December 1998 Partially Withheld Insp Repts 50-454/98-22 & 50-455/98-22 on 981116-20 (Ref 10CFR73.21).No Violations Noted.Major Areas Inspected:Selected Aspects of Physical Security Program & Testing of Licensee Access Control Equipment IR 05000454/19980211998-11-0505 November 1998 Insp Repts 50-454/98-21 & 50-455/98-21 on 981013-16.No Violations Noted.Major Areas Inspected:Alara Planning & Radiation Work Permit Programs & Whole Body Counting & Screening Programs IR 05000454/19983011998-11-0303 November 1998 NRC Operator Licensing Exam Repts 50-454/98-301(OL) & 50-455/98-301(OL) for Tests Administered on 980914-22.Out of Five License Applicants,One SRO Passed All Portions of Exam. Two RO & Two SRO Applicants Failed Portions of Exam IR 05000454/19980191998-10-29029 October 1998 Insp Repts 50-454/98-19 & 50-455/98-19 on 980825-1005.No Violations Noted.Major Areas Inspected:Licensee Operations, Maint,Engineering & Plant Support IR 05000454/19980171998-09-18018 September 1998 Insp Repts 50-454/98-17 & 50-455/98-17 on 980714-0824.No Violations Noted.Major Areas Inspected:Licensee Operations, Maint & Engineering ML20153D7701998-09-18018 September 1998 Notice of Violation from Insp on 980714-0824.Violation Noted:During 980616-18,AP 1100-3,Rev 11,inappropriate to Circumstances,In That Procedural Guidance Led to Belief That Main CR Ventilation Envelope Altered When CR Doors Opened ML20236W2081998-07-31031 July 1998 Notice of Violation from Insp on 980531-0713.Violation Noted:As of 980713,SF Storage Pool Design Would Not Have Prevented Inadvertent Draining Below 423 Feet 2 Inches IR 05000454/19980161998-07-31031 July 1998 Insp Repts 50-454/98-16 & 50-455/98-16 on 980713-17.No Violations Noted.Major Areas Inspected:Security Equipment Maint,Procedure & Records Review,Personnel Performance, Self Assessment & Previously Identified Issues IR 05000454/19980141998-07-31031 July 1998 Insp Repts 50-454/98-14 & 50-455/98-14 on 980531-0713. Violations Noted.Major Areas Inspected:Operations, Maint/Surveillance,Engineering & Plant Support IR 05000454/19980151998-07-22022 July 1998 Insp Repts 50-454/98-15 & 50-455/98-15 on 980706-09.No Violations Noted.Major Areas inspected:follow-up of April 1997 Maintenance Rule Baseline Insp That Reviewed Licensee Implementation of 10CFR50.65 ML20236H0291998-06-29029 June 1998 Notice of Violation from Insp on 980407-0530.Violation Noted:On 980502,OOS 970012670 Not Sufficient to Isolate Equipment Being Worked on ML20236H0321998-06-29029 June 1998 Insp Repts 50-454/98-11 & 50-455/98-11 on 980407-0530. Violations Noted.Major Areas Inspected:Operations, Maintenance,Engineering & Plant Support ML20248C0441998-05-28028 May 1998 Notice of Violation from Insp on 980403-27 & 0506.Violations Noted:Radiologically Posted Area Established for sodium-24 Used in Moisture Carryover Test Was Not Posted W/Sign Bearing Radiation Symbol & Listed Words IR 05000454/19980101998-05-28028 May 1998 Insp Repts 50-454/98-10 & 50-455/98-10 on 980403-27 & 0506. Violations Noted.Major Areas Inspected:Review of Radiation Protection Program IR 05000454/19980131998-05-26026 May 1998 Insp Repts 50-454/98-13 & 50-455/98-13 on 980415-0508. Violations Noted.Major Areas Inspected:Plant Support ML20248B0931998-05-26026 May 1998 Notice of Violation from Insp on 980415-0508.Violation Noted:Ffd Program Was Not Appropriately Implemented ML20248C7271998-05-21021 May 1998 Errata to Notice of Violation from Insp on 980113-0223 W/Combined Violations ML20217Q9671998-05-0505 May 1998 Notice of Violation from Insp on 980224-0406.Violations Noted:Unit 1 Changed Operational Mode from Mode 5 to Mode 4 When Conditions for LCO of TS 3.4.6.1.b Were Not Met & Associated Action Required Shutdown within Specified Time ML20217R0141998-05-0505 May 1998 Insp Repts 50-454/98-09 & 50-455/98-09 on 980223-0406. Violations Noted.Major Areas Inspected:Operation, Maint Surveillance & Plant Support ML20217E8421998-03-27027 March 1998 Notice of Violation from Insp on 980120-0210.Violation Noted:On 960607,team Identified That Field Change Request (Fcr) 960062 Was Not Subjected to Design Control Measures Commensurate W/Measures Applied to Original Design ML20217E8671998-03-27027 March 1998 Insp Repts 50-454/98-04 & 50-455/98-04 on 980120-0210. Violations Noted.Major Areas Inspected:Engineering,Technical Support & Self Assessment Activities ML20217E5501998-03-26026 March 1998 Insp Rept 50-454/97-21 on 970919-980228.Violations Noted. Major Areas Inspected:Observations of Operations Training, Preparation for SG Replacement,Maint/Construction Activities & Review of Engineering & Quality Assurance ML20217E5261998-03-26026 March 1998 Notice of Violation from Insp on 970919-980226.Violations Noted:Licensee Contracted Level II Liquid Penetrant Exam Examiner Incorrectly Performed Liquid Penetrant Exam of SG IR 05000454/19980081998-03-20020 March 1998 Insp Repts 50-454/98-08 & 50-455/98-08 on 980302-06. Violations Noted.Major Areas Inspected:Transportation & Solid Radioactive Waste Programs ML20217D1031998-03-20020 March 1998 Notice of Violation from Insp on 980302-06.Violation Noted: on 980306,chemistry Technician Failed to Close Valve V8 Before Withdrawing 2 Gas Samples from Panel for Hydrogen & Isotopic Analyses ML20248L8161998-03-16016 March 1998 Notice of Violation from Insp on 980113-0223.Violations Noted:On 980117,plant Administrative Procedure 330-1,section c.b.c.4,not Implemented & on 970910,licensee Operated Gwps Differently from Ufsar,Section 11.3.2.1 IR 05000454/19980051998-03-16016 March 1998 Insp Repts 50-454/98-05 & 50-455/98-05 on 980113-0223. Violations Noted.Major Areas Inspected:Operations,Maint, Engineering & Plant Support IR 05000454/19980071998-03-13013 March 1998 Insp Repts 50-454/98-07 & 50-455/98-07 on 980217-25.No Violations Noted.Major Areas Inspected:Various Aspects of Physical Security Program IR 05000454/19980061998-02-17017 February 1998 Insp Repts 50-454/98-06 & 50-455/98-06 on 980120-23 & 26. Noncited Violation Identified.Major Areas Inspected:Review of Radiation Protection Program 1999-09-08 |
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-86-63 Date July 7, 1986 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verifi-cation or evaluation, and is basically all that is known by the Region III staff on this date.
Facility: Commonwealth Edison Company Licensee Emergency Classification:
Byron Unit 1 X Notification of an Unusual Event Byron, IL 61010 Alert Site Area Emergency Docket No. 50-454 General Emergency Not Applicable -
Subject:
REACTOR SHUTDOWN TO REPAIR PRIMARY SYSTEM LEAK At 7:50 p.m. (CDT) on July 2, 1986, the licensee began to shut the unit down as a result of unidentified leakage from the reactor cooling system. (The leakage was measured to be 1.007 gallons per minute; the Technical Specification limit, r: quiring shutdown, is 1 gallon per minute.) The licensee declared an Unusual Ev:nt under its emergency plan. The licensee cooled the reactor to Cold Shutdown conditions and terminated the Unusual Event at 3:00 a.m. (CDT), July 4,1986.
Th2 source of the leakage was determined to be the resistance temperature detector manifold for the "D" reactor cooling loop. The licensee estimates that repa;n will take 14 days, and will perform other maintenance activities during the outage.
The resident inspectors will monitor the licensee's activities.
The State of Illinois will be informed.
R;gion III (Chicago) was notified of this shutdown at 10:20 p.m. (CDT) on July 2, 1986, by the Headquarters Duty Officer. Details on the length of the outage were obtained at 9:00 a.m. (CDT), on July 7, 1986. This information is current as of that time.
(D. RFtd A CONTACT: W. forney R. Warnick FTS 388-5590 FTS 388-5575 DISTRIBUTION:
H. St. ED0 NRR E/W Willste Mail: ADM:DMB Chairman Palladino PA IE NMSS DOT:Trans only Conin. Zech ELD OIA RES Comm. Bernthal AE00 Comm. Roberts Comm. Asselstine SPd//p Regional Offices ACRS SECY INP0 J7 9 NSAC 27 2/
CA RIII Resident Office PDR Licensee: .213 8 (Corp. Office - Reactor Lic. Only)
Region III Ih O I 8607140156 860707 Rev. November 1985 l
Date