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
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| ML20212B643 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 12/18/1986 |
| From: | Forney W, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| References | |
| PNO-III-86-151, NUDOCS 8612290285 | |
| Download: ML20212B643 (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 |
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PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL'0CCURRENCE--PNO-III-86-151- Date 12/18/86 M fL e .
This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region III staff on this date.
Facility: Comonwealth Edison. Company Licensee Emergency Classification:
Byron, Unit 2 Notification of an Unusual Event Byron, IL 61010 Alert Site Area Emergency Docket No.: 50-455 General Emergency XX_Not Applicable h Subj:ct: PIPE CRACK At4:18a.'m.(CST) December 18, 1986, with the plant in Mode 3 (hot standby), the licensee n;tictd a loss of water and drop in pressure in the 2D accumulator (the unit has four accumulator holding tanks which contain about 900 gallons of water each. In the event of a loss of coolant accident, the water would be injected into the primary system.)
l '
Lic;nsee personnel entered / containment and discovered a crack in a 1 inch line used in filling the accumulator. ' Although the leak rate was less than 10 gallons per minute, Technical Specifications require the accumulators to be operable when the plant is in Mode 3 and licensee began a gradual cooldown.
The unit is c'urrently in Mode 4 (hot shutdown). The cause and extent of the crack is still unknown. It also is unknown how long the unit will remain in Mode 4 while the licensee makes the necessary repairs.
Region III (Chicago) is monitoring the licensee's course of action.
Th] State of Illinois will be notified.
R;gion III was first informed of this event at 5:10 a.m (CST), December 18, 1986. This infcrmation is current as of 11:30 a.m., December 18, 1986.
CONTACT: W F R.W b k FTS 388-5590 FTS 388-5575 DISTRIBUTION:
H. St. ED0 NRR E/W Willste Mail: ADM:DMB Chairman Zech PA IE NMSS D0T:Trans only Comm. Roberts ELD OIA RES Comm. Asselstine AE0D NRC Ops Ctr c%O/
Comm. Bernthal Comm. Carr SP /f//3 Regional Offices ACRS SECY INP0 /. W NSAC /S/p CA RIII Resident Office PDR Licensee: FO[p (Corp. Office - Reactor Lic. Only)
Region III B612290285 PDR I&E 861218 PNO-III-86-151 PDR I\
NE 3Y