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LER 98-023-00:on 981008,discovered that Air Filtration Unit (AFU) airflow & AFU differential pressure exceeded TS limits.Caused by inaccuracy of CREVS AFU airflow instrument. Licensee adjusted AFU airflow rate to meet TS requirements.

LER 98-023-00:on 981008,discovered that Air Filtration Unit (AFU) airflow & AFU differential pressure exceeded TS limits.Caused by inaccuracy of CREVS AFU airflow instrument. Licensee adjusted AFU airflow rate to meet TS requirements.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/11/06.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-022-00:on 980930,reactor low water level scram occurred when equipment OOS disabled FW level control.Caused by inadequate review of controlled drawings.Heightened risk assessment for OOS activities.

LER 98-022-00:on 980930,reactor low water level scram occurred when equipment OOS disabled FW level control.Caused by inadequate review of controlled drawings.Heightened risk assessment for OOS activities.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/10/29.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-025-00:on 981102,HPCIS PCI check valve failed.Caused by corrosion in valve body.Revised check valve insp procedures to add corrosion repair criteria.

LER 98-025-00:on 981102,HPCIS PCI check valve failed.Caused by corrosion in valve body.Revised check valve insp procedures to add corrosion repair criteria.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/12/01.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-020-00:on 980813,HPCIS was inoperable due to HP pump thrust bearing oil leak.Caused by improper setting of thrust bearing.Reviewed maint & training procedure to determine if changes are needed.

LER 98-020-00:on 980813,HPCIS was inoperable due to HP pump thrust bearing oil leak.Caused by improper setting of thrust bearing.Reviewed maint & training procedure to determine if changes are needed.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/09/11.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-003-00:on 980628,main generator trip & subsequent reactor scram occurred due to loose electrical connection in current transformer.Caused by vibrations.Stabilized Unit 2 by placing unit in hot shutdown.

LER 98-003-00:on 980628,main generator trip & subsequent reactor scram occurred due to loose electrical connection in current transformer.Caused by vibrations.Stabilized Unit 2 by placing unit in hot shutdown.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/07/27.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 99-001-00:on 990217,unplanned ESFA on Unit 2 when "A" channel of RPS bus de-energized was noted.Caused by failure of voltage regulator transformer (VRT) that was not included in PM program.Replaced control transformer & circuit board.

LER 99-001-00:on 990217,unplanned ESFA on Unit 2 when "A" channel of RPS bus de-energized was noted.Caused by failure of voltage regulator transformer (VRT) that was not included in PM program.Replaced control transformer & circuit board.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1999/03/15.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-015-00:on 980326,declared CREVS inoperable.Caused by excessive wear to valve internals,which was not detected prior to event due to lack of preventative maint for valve. Valve repaired.

LER 98-015-00:on 980326,declared CREVS inoperable.Caused by excessive wear to valve internals,which was not detected prior to event due to lack of preventative maint for valve. Valve repaired.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/04/24.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-018-00:on 980627,full reactor SCRAM occurred while performing TS required weekly APRM surveillance.Caused by spurious trip from RPS channel B SCRAM discharge instrument volume level instrumentation.Replaced level transmitter.

LER 98-018-00:on 980627,full reactor SCRAM occurred while performing TS required weekly APRM surveillance.Caused by spurious trip from RPS channel B SCRAM discharge instrument volume level instrumentation.Replaced level transmitter.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/07/27.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-001-01:on 980105,EDG failed to start when received inadvertent start signal.Caused by degraded fuse clip in EDG control power circuit.Corrective actions have included training,counseling,component testing & evaluation.

LER 98-001-01:on 980105,EDG failed to start when received inadvertent start signal.Caused by degraded fuse clip in EDG control power circuit.Corrective actions have included training,counseling,component testing & evaluation.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/10/27.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-006-00:on 980918,Unit 2 entered 12 h LCO to hot shutdown,due to HPCI & RCIC being declared inoperable.Caused by inadequate procedure rev.Revised procedure QCIS 0200-06.

LER 98-006-00:on 980918,Unit 2 entered 12 h LCO to hot shutdown,due to HPCI & RCIC being declared inoperable.Caused by inadequate procedure rev.Revised procedure QCIS 0200-06.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/10/15.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-012-01:on 980227,reactor bottom head drain line developed leak.Caused by inadequate work practice during original construction.Replaced leaking section of drain line under design change package(DCP 9800100).

LER 98-012-01:on 980227,reactor bottom head drain line developed leak.Caused by inadequate work practice during original construction.Replaced leaking section of drain line under design change package(DCP 9800100).
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/05/29.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-003-00:on 971210,TS LCO was exceeded when SBGT subsystem was inoperable because EDGs was inoperable.Caused by inadequate procedure development & review.Correctly positioned valve & revised procedure.

LER 98-003-00:on 971210,TS LCO was exceeded when SBGT subsystem was inoperable because EDGs was inoperable.Caused by inadequate procedure development & review.Correctly positioned valve & revised procedure.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/02/03.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-014-00:on 980306,required ASME section XI code examination for feedwater nozzles were not conducted during second ten year interval.Caused by weakness in processes existing at time for completion.Searches were completed.

LER 98-014-00:on 980306,required ASME section XI code examination for feedwater nozzles were not conducted during second ten year interval.Caused by weakness in processes existing at time for completion.Searches were completed.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/04/05.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-011-00:on 980716,unqualified circuit card was installed in SD instrument vol level transmitter,rendering it inoperable.Caused by personnel error.Reviewed event with Instrument Maint,Sys Engineering & Procurement Engineering.

LER 98-011-00:on 980716,unqualified circuit card was installed in SD instrument vol level transmitter,rendering it inoperable.Caused by personnel error.Reviewed event with Instrument Maint,Sys Engineering & Procurement Engineering.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/08/12.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-024-00:on 981022,noted that TS LCO was not met when PCIV was made inoperable by maint.Caused by improper authorization to start work.Operations completed required testing for 1-1601-21 PCIV on 981022.

LER 98-024-00:on 981022,noted that TS LCO was not met when PCIV was made inoperable by maint.Caused by improper authorization to start work.Operations completed required testing for 1-1601-21 PCIV on 981022.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/11/18.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 97-026-00:on 970328,noted that TS required instrument channel checks were not documented prior to entering applicable mode.Caused by inadequate procedure development. Revised procedures & counseled personnel involved.

LER 97-026-00:on 970328,noted that TS required instrument channel checks were not documented prior to entering applicable mode.Caused by inadequate procedure development. Revised procedures & counseled personnel involved.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1997/12/19.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-021-00:on 980918,weekly position verification of RB to suppression chamber CV vacuum breakers was misinterpreted & not perfromed.Caused by inadequate development of specification.Implemented procedure changes.

LER 98-021-00:on 980918,weekly position verification of RB to suppression chamber CV vacuum breakers was misinterpreted & not perfromed.Caused by inadequate development of specification.Implemented procedure changes.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/10/15.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-019-00:on 980917,high RP permissive switch to RHR shutdown cooling sys would not close & would not calibrate. Caused by switch aging.Failed switch was electrically disarmed per TS 3.2.A,Action 2.

LER 98-019-00:on 980917,high RP permissive switch to RHR shutdown cooling sys would not close & would not calibrate. Caused by switch aging.Failed switch was electrically disarmed per TS 3.2.A,Action 2.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/10/14.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-001-00:on 971122,TS surveillance for SRM was not performed within required interval for Units 1 & 2 due to inadequate identification of TS requirement in surveillance. Surveillance was performed for Units 1 & 2 on 980222.

LER 98-001-00:on 971122,TS surveillance for SRM was not performed within required interval for Units 1 & 2 due to inadequate identification of TS requirement in surveillance. Surveillance was performed for Units 1 & 2 on 980222.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/03/17.
Other Libraries in Japan
  • Author HeadingPETERSON, C.

LER 98-006-00:on 980128,RB post LOCA temperatures are higher than values used for environ qualification of electrical equipment due to unvalidated engineering judgment.Cause undetermined.Preliminary calculations completed.

LER 98-006-00:on 980128,RB post LOCA temperatures are higher than values used for environ qualification of electrical equipment due to unvalidated engineering judgment.Cause undetermined.Preliminary calculations completed.
Paper図書
PETERSON, C.COMMONWEALTH EDISON CO.1998/02/24.
Other Libraries in Japan
  • Author HeadingPETERSON, C.
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