05000338/LER-1985-026, Cancelled LER 85-026/00
From kanterella
| ML20155D475 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/09/1986 |
| From: | Harrell E, Mcknight J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF ADMINISTRATION (ADM) |
| References | |
| LER-85-026, LER-85-26, N-85-048, N-85-48, NUDOCS 8604170340 | |
| Download: ML20155D475 (2) | |
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Category:LICENSEE EVENT REPORT (SEE ALSO AO RO)
MONTHYEAR05000339/LER-1993-0051993-10-0404 October 1993
[Table view]LER 93-005-00:on 930909,EDG Load Sequencing Timers Found Outside Setpoint Tolerence Due to Setpoint Drift.Program Established to Replace Agastat 2400/7000 Series Timer Relays w/Allen-Bradley RTC Solid State timers.W/931004 Ltr 05000339/LER-1993-0021993-08-12012 August 1993 LER 93-002-01:on 930416,automatic Trip Occurred Due to Malfunction in Main Generator Voltage Regulator Circuitry. Performed Insp of turbine/generator.W/930812 Ltr 05000338/LER-1990-0081990-06-18018 June 1990 LER 90-008-00:on 900524,discovered Design Error Where Svc Water Sys Pressures Exceeded Design Values for Anchor Piping Support on Supply Lines for Spray Hxs.Justification for Continued Operation Developed & Mods performed.W/900618 Ltr 05000338/LER-1985-026, Cancelled LER 85-026/001986-04-0909 April 1986 Cancelled LER 85-026/00 05000338/LER-1983-077, Errata to LER 83-077/03L-0,forwarding Page 2,inadvertently Omitted from Original Distribution1983-11-17017 November 1983 Errata to LER 83-077/03L-0,forwarding Page 2,inadvertently Omitted from Original Distribution 05000338/LER-1981-090, Updated LER 81-090/99X-1:on 811214,annunciators for 20.2-hertz & 25.4-hertz Vertical Axis Channels of Containment Mat Response Spectrum Recorder Illuminated & Could Not Be Reset.Cause Unknown.Unit to Be Replaced1982-06-0404 June 1982 Updated LER 81-090/99X-1:on 811214,annunciators for 20.2-hertz & 25.4-hertz Vertical Axis Channels of Containment Mat Response Spectrum Recorder Illuminated & Could Not Be Reset.Cause Unknown.Unit to Be Replaced 05000339/LER-1982-017, Updated LER 82-017/03X-1:on 820413,number of Containment Isolation Valves Had Unacceptable Leak Rate.Caused by Misaligned Limit Switches on Svc Water Valves & Seating Surface Degradation or Fouling on Other Valves1982-06-0202 June 1982 Updated LER 82-017/03X-1:on 820413,number of Containment Isolation Valves Had Unacceptable Leak Rate.Caused by Misaligned Limit Switches on Svc Water Valves & Seating Surface Degradation or Fouling on Other Valves 05000338/LER-1982-017, Updated LER 82-017/03X-1:on 820408,during Full Power, Charcoal Sample Lab Analysis from Process Vent Filter Failed to Meet Testing Criteria.Caused by Natural Depletion of Charcoal.Redundant Filter Installed & Charcoal Replaced1982-05-19019 May 1982 Updated LER 82-017/03X-1:on 820408,during Full Power, Charcoal Sample Lab Analysis from Process Vent Filter Failed to Meet Testing Criteria.Caused by Natural Depletion of Charcoal.Redundant Filter Installed & Charcoal Replaced ML20064H8611978-12-18018 December 1978 /03L-0 on 781204:during Pwr Reduction,Axial Flux Difference Deviated Greater than 5%;during Return to Full Pwr Afd Deviated Greater than -5%.Caused by Load Reduction Caused by Unit Being on Load Following ML20064H4671978-12-13013 December 1978 /01T-0 on 781130:noted That Emergency Diesel Generator Battery Racks Were Improperly Installed.Caused by Failure to Perform Requested Mods ML20064G4441978-12-0707 December 1978 /03L-0 on 781115:Detectors a & B of Incore Movable Detector Sys Stuck in Inserted Position Due to Fouled Incore Movable Detector Guide Thimbles ML20064G4541978-12-0505 December 1978 /03L-0 on 781111:during Pwr Reduction,Axial Flux Difference Deviated Greater than Tech Spec Limits.Deviation Caused by Rapid Load Reduction Caused by Failure of Turbine Governor Valve 4 to Open During Test ML20064G4341978-12-0505 December 1978 /03X-1 on 781012:during Mode 1 Opers,At 100% Pwr, Feedwater Flow Transmitter FT-1496 on Feedwater Loop C Failed Low.Caused by Blown Fuse.Fuse Subsequently Replaced ML20064G1651978-12-0101 December 1978 /03L-0 on 781110:during Critical Steady State Oper Alarms Showed High Steam Line Differential Pressure on Line B.Proper Bistables Tripped,Placing Plant in Safe Condition. Caused by Faulty Instru Loop Pwr Supply Card in Circuitry ML20064G1761978-12-0101 December 1978 /03X-1 on 780728:particulate Filter & Charcoal Filter Were Clogged.Caused by Driving Mechanism of RM-RMS-159 Filter Being Jammed ML20064F8801978-11-29029 November 1978 /01T-0 on 781116:Svc Water & Component Cooling Piping & Pipe Supports Not Analyzed for Thermal & Seismic Stresses.Design Personnel Utilized Wrong Svc Water Temps for Stress Analysis.Present Analysis Shows Adequate Support ML20064F7331978-11-27027 November 1978 /03L-0 on 781102:during Pwr Escalation,Upper Flux Deviation Alarm Was Received & Traced to a High Quadrant Pwr Tilt Ratio.Believed Cause Was Nonlinear Detector Resonse at Lower Pwr ML20064F7221978-11-27027 November 1978 /03L-0 on 781101:axial Flux Difference Deviated Greater than -5% from Target for One Minute.Caused by Pwr Reduction Necessitated by Problem with Cooling Fans on Main Station Transformer C ML20064F7261978-11-27027 November 1978 /03L-0 on 781107:during 1-pt-134 Periodic Test, MOV-QS102A Would Not Return to Normal Closed Position Because of Dirty Contacts on Valve'S Torgue Switch.Contacts Were Cleaned ML20064F7401978-11-27027 November 1978 /03L-0 on 781101:main Steam Trip Valve 1-TV-MS-111A Was Detected Leaking Due to a Deteriorated Internal Gasket.Valve Was Isolated & Gasket Replaced ML20064F2161978-11-21021 November 1978 /01T-0 on 781121:inspec of Station Battery Racks Revealed That Racks Had Been Improperly Assembled & Installed During Constr.Deficiencies Will Be Corrected ML20064F2041978-11-21021 November 1978 /01T-0 on 781113:during Steady State Oper,It Was Discovered That Only One Seal or Barrier Exists for Spare Pipe Penetrations in Conflict W/Fsar Due to Oversight of Design Personnel.Engineering Is Analyzing It for Solution ML20064F2531978-11-17017 November 1978 /03l-0 on 780927:after maint,TV-BD100A,B,D & F Were Tested But Not Timed Prior to Return to Svc,Due to Personnel Error.Personnel Have Reviewed the Requirements ML20064F2351978-11-17017 November 1978 /01X-0 on 781108:a Field Mod Was Made to Vessel Lower Head Insulation & the Mod Was Not Seismically Analyzed IAW FSAR Due to Personnel Error.Subsequently Analyzed by Stone & Webster & by Westinghouse ML20064E6781978-11-14014 November 1978 /03L-0 on 781025:During Routine Startup Oper,Axial Flux Difference Deviated Greater than 5% from target.48 Penalty Min Accumulated.Caused by Xenon Transient Occurrence.Corrective Action:Boration by Reactor Operator ML20064E4421978-11-13013 November 1978 /03X-1 on 780915:during Periodic Test,A Bistable (FC-1485 in Protec Channel Iv)Associated W/Hi Steamline Flow S.I.Actuation Failed to Trip,Due to Defective Bistable Card ML20064E4381978-11-13013 November 1978 /99X-1 on 780413:with All Rods Out at Beginning of Core Life,Hot Zero Pwr Moderator Temp Coefficient Revealed It Was More Positive than 0 Delta K/K/F in Tech Spec,Due to Positive Mtc for the all-rods-out Configuration ML20064F2411978-10-24024 October 1978 /03l-0 on 781024:following a Reactor Trip,The Containment Bulk Avg Temp Exceeded 105 Degrees F Tech Spec Limit Due to Steam Loss to Chilled Water Sys Vacuum Refrigeration Unit ML20064B9731978-10-10010 October 1978 /99X-1 on 780712:the Area Temp Monitoring Log Erroneously Recorded Excessive Temps in Battery Rooms.Cause Is Unknown ML20064B9831978-10-10010 October 1978 /03L-0 on 780905:a Bistable (FC-1485 in Protec Channel IV) Failed to Trip During a Periodic Test.Defective Bistable Card Was the Cause & Replaced ML20147B0601978-09-22022 September 1978 /03L-0 on 780830:Testing of Quench Spray Pump 1-QS-P-1B Showed Pressure Drop of Over 10psi on the Suction Line During Oper,Caused by Wooden Dam in Piping. (Encl to 7810030071) 1993-08-12 Category:TEXT-SAFETY REPORT MONTHYEARML20217N9281999-10-20020 October 1999
[Table view]Special Rept:On 991003,PZR PORV Actuation Mitigated RCS low- Temp Overpressure Transient.Caused by a RCP Facilitating Sweeping of Entrained Air Out of RCS Loops.Operating Procedure 2-OP-5.1 Will Be Revised ML20217H3631999-10-14014 October 1999 Rev 0 to COLR for North Anna 2 Cycle 14 Pattern Su ML18152A2811999-10-12012 October 1999 Technical Basis for Elimination of Nozzle Inner Radius Insps (for Nozzles Other than Reactor Vessel),Technical Basis for ASME Section XI Code Case N-619. 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| 3382085026R00 - NRC Website | |
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