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| {{#Wiki_filter:P R.ICOR.I EY'ACCLLERATED RIDS PROC!'.SSI REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)ACCESSION NBR:9412210168 DOC.DATE: 94/12/13 NOTARIZED: | | {{#Wiki_filter:P R.ICOR.I RIDS PROC!'.SSI EY'ACCLLERATED REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS) |
| NO FACIL:50-251 Turkey Point Plant, Unit 4, Florida Power and Light C AUTH.NAME AUTHOR AFFILIATION KNORR,J.E. | | ACCESSION NBR:9412210168 DOC.DATE: 94/12/13 NOTARIZED: NO DOCKET FACIL:50-251 Turkey Point Plant, Unit 4, Florida Power and Light C 05000251 AUTH. NAME AUTHOR AFFILIATION KNORR,J.E. Florida Power & Light Co. |
| Florida Power&Light Co.PLUNKETT,T.F. | | PLUNKETT,T.F. Florida Power & Light Co. |
| Florida Power&Light Co.RECIP.NAME RECIPIENT AFFILIATION DOCKET 05000251 | | RECIP.NAME RECIPIENT AFFILIATION |
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| ==SUBJECT:== | | ==SUBJECT:== |
| LER 94-006-00:on | | LER 94-006-00:on '941130,Unit -4 tripped automatically. Caused by failure of flexible link connection between main generator B phase bus & associated isolated phase bus bar. |
| '941130,Unit | | All bolts on flexible link checked.W/941213 ltr. |
| -4 tripped automatically. | | DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR ENCL ) SIZE: |
| Caused by failure of flexible link connection between main generator B phase bus&associated isolated phase bus bar.All bolts on flexible link checked.W/941213 ltr.DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR ENCL)SIZE: TITLE: 50.73/50.9 Licensee Event Report (LER), Inciden&Rpt, etc.NOTES RECIPIENT ID CODE/NAME PD2-2 PD INTERNAL: AEOJ~3-S-D JRA'B MI-LE=GENT 02 NRR/DE/EELB NRR/DI S P/PI PB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DSSA/SPLB RES/DSIR/EIB EXTERNAL: L ST LOBBY WARD NOAC MURPHY,G.A NRC PDR COPIES LTTR ENCL 1 1 2 2 1 1 1 1 1 1 1 1 1 1'1 1 1 1 1 1 1 1 1 1 RECIPIENT ID CODE/NAME CROTEAU,R AEOD/S PD/RRAB NRR/DE/ECGB NRR/DE/EMEB NRR/DOPS/OECB NRR/DRCH/HICB NRR/DRSS/PRPB | | TITLE: 50.73/50.9 Licensee Event Report (LER), Inciden&Rpt, etc. |
| 'RR/DSSA/SRXB RGN2 FILE 01 LITCO BRYCE,J H NOAC POOREiW NUDOCS FULL TXT COPIES LTTR ENCL 1 1 1 1 1 1 1 2 1 1 2 2 1 1 1 1 YOTE TO ALL"Rl DS" RECIPIENTS: | | NOTES RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 PD 1 1 CROTEAU,R 1 1 INTERNAL: AEOJ~3-S -D JRA'B 2 2 AEOD/S PD/RRAB 1 MI-LE=GENT 02 1 1 NRR/DE/ECGB 1 NRR/DE/EELB 1 1 NRR/DE/EMEB 1 NRR/DI S P/PI PB 1 1 NRR/DOPS/OECB 1 NRR/DRCH/HHFB 1 1 NRR/DRCH/HICB 1 NRR/DRCH/HOLB 1 1 NRR/DRSS/PRPB 2 NRR/DSSA/SPLB '1 1 'RR/DSSA/SRXB 1 RES/DSIR/EIB 1 1 RGN2 FILE 01 1 EXTERNAL: L ST LOBBY WARD 1 1 LITCO BRYCE,J H 2 2 NOAC MURPHY,G.A 1 1 NOAC POOREiW 1 1 NRC PDR 1 1 NUDOCS FULL TXT 1 1 DOCUMENT'I'S YOTE TO ALL"Rl DS" RECIPIENTS: |
| PLEASE HELP US TO REDUCE EVKSTE!CON'TAP'I"I'I IE DOCI.'ifEiT CONTROL DESh.ROOM PI-37 I EAT.'504-~OS3 | | PLEASE HELP US TO REDUCE EVKSTE! CON'TAP'I"I'IIE DOCI.'ifEiTCONTROL DESh. ROOM PI -37 I EAT.'504-~OS3 ) TO I'.LIXflNATE 5'Ol R X'AhfL I ROif DISTRI8 O'I'IOi LIS'I'S I'OR YOI: DOi "I'EI'.D! |
| )TO I'.LI Xfl NATE 5'Ol R X'Ahf L I ROif DISTRI8 O'I'IOi LIS'I'S I'OR DOCUMENT'I'S YOI: DOi"I'EI'.D!FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 27 ENCL 27 Cl I L-94-311 10 CFR 50'3 U.S.Nuclear Regulatory Commission Attn: Document Control Desk Washington,'D.C.20555 Gentlemen: | | FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 27 ENCL 27 |
| Re: Turkey Point Unit 4 Docket No.50-251 Reportable Event: 94-006-00 Automatic Reactor Trip Due to Main Generator Ground The attached=-Licensee Event Report, 251/94-006-00, is being provided in accordance with 10 CFR 50.73(a)(2)(iv).Xf there are any questions, please contact us.Very truly yours,/7~'I T.F.Plunkett Vice President Turkey Point Plant jek enclosure cc Stewart D.Ebneter, Regional Administrator, Region II, USNRC Thomas P.Johnson, Senior Resident Inspector, USNRC, Turkey Point Plant 943.223.03.68 5'43.21 i PDR ADOCVi 050r'r0>53 8 PDR an FPL Group company Il FACILZTY NAME (I)LICENSEE EVENT REPORT (LER)'I DOCKET NUMBER (2)PAGE (3)TITLE (4)TURKEY POINT UNIT 4 05000251 1 oF 3 AUTOMATIC REACTOR TRIP DUE TO MAIN GENERATOR GROUND EVENT DATE (5)LER Nl&DER(6)RPT DATE (?)OTHER PACILITIES INV.(8)MON DAY SEQ S RS'ON DAY PACILITY NAMES DOCKET S (S)30 94'4 006 00 12 13 94 OPERATING MODE (9)1 10 CFR 50.73 a 2 iv POWER LEVEL (10)100%LICENSEE CONTACT FOR THIS LER (12)J.-E.Knorr, Regulation and Compliance Engineer TELEPHONE N(B(BER 305-246-6757 COMPLETE ONE LINE FOR EACH COMPONENT PAZLURE DESCRIBED IN THIS REPORT (13)CAUSE SYSTEM COMPONENT NPRDS?CAUSE SYSTEM COMPONENT NPRDS'?SUPPLEMENTAL REPORT EXPECTED (14)NO gl YES'C3 (if yee, coaylete EXPECTED SUBMISSION DATE)EXPECTED SUBM I 5 5 ION DATE (15)MONTH DAY ABSTRACT (16)On November 30,.1994, Unit 4 tripped automatically because of the failure of a flexible link connection between the main generator B phase bus and its associated isolated phase bus bar.The flexible link came loose and grounded against the isolated phase bus duct work causing a generator lockout, turbine trip and automatic reactor trip.At the time of the trip Unit 4 was in Mode 1 operating at approximately 100%power.All systems responded as expected to the automatic reactor trip.
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| LICENSEEVENT REPORT (LER)TEEONTINUATION FACILITY NAME TURKEY POINT UNIT.4 DOCKET NOMBER 05000251 LER NUMBER PAGE NO.94-006-00 02 OF 04 I.DESCRIPTION OF THE EVENT On November 30, 1994, at 1542, Unit 4 tripped automatically because of the failure of a flexible link connection between the main generator B phase bus and its associated isolated phase bus bar.Unit 4 was in Mode 1 operating at approximately 100%power steady state operation.
| | Cl I L-94-311 10 CFR 50 '3 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, 'D. C. 20555 Gentlemen: |
| When the connection failed, the flexible link fell against the adjacent isolated phase bus duct thereby grounding that phase, causing a main generator ground, generator lockout, turbine trip and an automatic reactor trip.All safety systems responded as expected to the reactor trip.Reactor trip recovery actions were completed in accordance with.procedure 4-EOP-E-O, Reactor Trip or Safety Injection. | | Re: Turkey Point Unit 4 Docket No. 50-251 Reportable Event: 94-006-00 Automatic Reactor Trip Due to Main Generator Ground The attached =- |
| The ground current was limited due to the design value for the ground circuit for the main generator. | | Licensee Event Report, 251/94-006-00, is being provided in accordance with 10 CFR 50.73(a) (2) (iv) . |
| Therefore, no damage occurred to the bus work or the isolated phase bus.The NRCOC was notified at 1648 on November 30, 1994.This event is being reported in accordance with 10 CFR 50.73(a)(iv), as an automatic actuation of the reactor protection system.II.CAUSE OF THE EVENT The cause of the failure of the flexible link connection was a personnel error resulting in an inadequate torque of the bolted connection. | | Xf there are any questions, please contact us. |
| The required torque for the connection was 40 foot-pounds. | | Very truly yours, |
| These connections were disconnected, cleaned and reinstalled as part of the maintenance scheduled for this equipment during the recent refueling outage.After the trip, one flexible link was found fallen away from the bus and touching the isolated phase bus ductwork.Five bolts on the north face of the B phase of the generator bus were found loose.Procedure O-PME-090.1 Power Generator Grounding For'Safety and Testing Preparation, was used as work control for the flexible link removal and reinstallation'his work control was not adequate to ensure all flexible link connections were retorqued to 40 foot pounds.A contributor to the event was more than one worker completing torquing of the bolts on the B phase flexible links without verification of each link during.the process.The A and C phases were each completed by one worker.III.ANALYSIS OF THE EVENT S stem Descri tion The main generator output voltage at Turkey Point Unit 4 is a nominal 22 kV.The grounding circuit of the main generator and isolated phase bus is designed to limit current during a ground fault.A primary main generator ground neutral relay monitors the generator ground neutral which is connected through a transformer and resistor between ground and the neutral of the wye connected generator. | | /7~'I T. F. Plunkett Vice President Turkey Point Plant jek enclosure cc Stewart USNRC D. Ebneter, Regional Administrator, Region II, Thomas P. Johnson, Senior Resident Inspector, USNRC, Turkey Point Plant 943.223.03.68 5'43.21 i PDR ADOCVi 050r'r0>53 8 PDR an FPL Group company |
| A secondary generator ground relay'onitors voltage phase imbalance on the generator output to indicate a ground by sensing the change in the phase voltages when a ground is present on any of the phases of the generator. | | |
| Both relays actuated as expected for an actual generator ground.These relays initiate a generator lockout.As discussed above, this relay operation ultimately results in an automatic reactor trip. | | Il LICENSEE EVENT REPORT (LER) |
| | 'I FACILZTY NAME (I ) DOCKET NUMBER (2) PAGE (3) |
| | TURKEY POINT UNIT 4 05000251 oF 1 3 TITLE (4) |
| | AUTOMATIC REACTOR TRIP DUE TO MAIN GENERATOR GROUND EVENT DATE (5) LER Nl&DER(6) RPT DATE (?) OTHER PACILITIES INV. (8) |
| | MON DAY SEQ S RS 'ON DAY PACILITY NAMES DOCKET S (S) 30 94 '4 006 00 12 13 94 OPERATING MODE (9) 1 POWER LEVEL (10) 100% |
| | 10 CFR 50.73 a 2 iv LICENSEE CONTACT FOR THIS LER (12) |
| | TELEPHONE N(B(BER J. -E. Knorr, Regulation and Compliance Engineer 305-246-6757 COMPLETE ONE LINE FOR EACH COMPONENT PAZLURE DESCRIBED IN THIS REPORT (13) |
| | CAUSE SYSTEM COMPONENT NPRDS? CAUSE SYSTEM NPRDS'? |
| | COMPONENT SUPPLEMENTAL REPORT EXPECTED (14) NO gl YES 'C3 EXPECTED SUBM I5 5 ION MONTH DAY DATE (15) |
| | (if yee, coaylete EXPECTED SUBMISSION DATE) |
| | ABSTRACT (16) |
| | On November 30,. 1994, Unit 4 tripped automatically because of the failure of a flexible link connection between the main generator B phase bus and its associated isolated phase bus bar. The flexible link came loose and grounded against the isolated phase bus duct work causing a generator lockout, turbine trip and automatic reactor trip. At the time of the Unit 4 was in Mode 1 operating at approximately 100% power. All systemstrip responded as expected to the automatic reactor trip. |
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| | LICENSEEVENT REPORT (LER) TEEONTINUATION FACILITY NAME DOCKET NOMBER LER NUMBER PAGE NO. |
| | TURKEY POINT UNIT. 4 05000251 94-006-00 02 OF 04 I. DESCRIPTION OF THE EVENT On November 30, 1994, at 1542, Unit 4 tripped automatically because of the failure of a flexible link connection between the main generator B phase bus and its associated isolated phase bus bar. Unit 4 was in Mode 1 operating at approximately 100% power steady state operation. When the connection failed, the flexible link fell against the adjacent isolated phase bus duct thereby grounding that phase, causing a main generator ground, generator lockout, turbine trip and an automatic reactor trip. All safety systems responded as expected to the reactor trip. Reactor trip recovery actions were completed in accordance with. procedure 4-EOP-E-O, Reactor Trip or Safety Injection. |
| | The ground current was limited due to the design value for the ground circuit for the main generator. Therefore, no damage occurred to the bus work or the isolated phase bus. |
| | The NRCOC was notified at 1648 on November 30, 1994. This event is being reported in accordance with 10 CFR 50.73(a)(iv), as an automatic actuation of the reactor protection system. |
| | II. CAUSE OF THE EVENT The cause of the failure of the flexible link connection was a personnel error resulting in an inadequate torque of the bolted connection. The required torque for the connection was 40 foot-pounds. These connections were disconnected, cleaned and reinstalled as part of the maintenance scheduled for this equipment during the recent refueling outage. After the trip, one flexible link was found fallen away from the bus and touching the isolated phase bus ductwork. Five bolts on the north face of the B phase of the generator bus were found loose. |
| | Procedure O-PME-090.1 Power Generator Grounding For 'Safety and Testing Preparation, was used as work control for the flexible link removal and reinstallation'his work control was not adequate to ensure all flexible link connections were retorqued to 40 foot pounds. A contributor to the event was more than one worker completing torquing of the bolts on the B phase flexible links without verification of each link during .the process. |
| | The A and C phases were each completed by one worker. |
| | III. ANALYSIS OF THE EVENT S stem Descri tion The main generator output voltage at Turkey Point Unit 4 is a nominal 22 kV. The grounding circuit of the main generator and isolated phase bus is designed to limit current during a ground fault. A primary main generator ground neutral relay monitors the generator ground neutral which is connected through a transformer and resistor between ground and the neutral of the wye connected generator. A secondary generator ground voltage phase imbalance on the generator output to indicate a relay'onitors ground by sensing the change in the phase voltages when a ground is present on any of the phases of the generator. Both relays actuated as expected for an actual generator ground. These relays initiate a generator lockout. As discussed above, this relay operation ultimately results in an automatic reactor trip. |
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| | LICENSE~NT REPORT (LER). TEX9QNTINUATION FACILITY NAME DOCKET NUMBER LER NUMBER PAGE No. |
| | TURKEY POINT UNIT 4 05000251 94-006-00 03 OF 04 Each output phase of the main generator is connected to its associated isolated phase bus by a series of 20 pairs of flexible links. Each pair of links is installed back to back and requires two bolts at each end to connect it,to the main generator bus at one end and the isolated phase bus on the other. Each bolt must be-torqued to 40 foot-pounds. A total of 240 bolts are required to complete the installation of all flexible links between the each of three phases of the main generator buses and their associated isolated phase bus. |
| | ISO-PHASE DUCT AREA I SO-PHASE L INKS (olde vIew) |
| | I SO-PHASE OVCT (bock side of ores) |
| | LINK T CAME LOOSE 80LTS LINKS 8OLTS I SO-PHASE BVS SPACER IQT SHAN |
| | ~ I SO-PHASE BVS L INKS (front sIde of work cree) |
| | Safet Anal sis analysis for a transient of this type assumes a total loss of load The UFSAR without a. direct or immediate reactor trip. 'n this event, a reactor -trip occurred upon receipt of the turbine trip. The UFSAR conclusion was that this event poses no hazard to the integrity of the reactor coolant system and steam system. |
| | No other engineered safety systems or reactor protection systems actuated or were required to actuate during or after the trip. Therefore, the health and safety of the public were not affected. |
| | IV.. CORRECTIVE ACTIONS All 240 connecting bolts on the main generator flexible links were checked for proper torque. |
| | : 2. The main generator was megger tested with satisfactory results. |
| | : 3. The procedure used to install the mai:n generator flexible links will be reviewed to determine necessary work process improvements. These improvements, if necessary, will be completed piior to the next outage requiring work on these links. |
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| | Ct' |
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| | LZCENS1EVENT REPORT (LER) TEXONTZNUATZON FACILITY NAME DOCKET NUMBER LER NOMBER PAGE NO. |
| | TURKEY POINT UNIT 4 0500025l 94-006-00 04 OF 04 V. ADDZT ZONAL INFORMATION 4 |
| | EIIS Codes are shown in the format [EIIS SYSTEM: IEEE component function identifier, second component function identifier (if appropriate)]. |
| | No other LERs were issued during the past two y'ears for a personnel error caused reactor trip. |
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| LICENSE~NT REPORT (LER).TEX9QNTINUATION FACILITY NAME TURKEY POINT UNIT 4 DOCKET NUMBER 05000251 LER NUMBER PAGE No.94-006-00 03 OF 04 Each output phase of the main generator is connected to its associated isolated phase bus by a series of 20 pairs of flexible links.Each pair of links is installed back to back and requires two bolts at each end to connect it,to the main generator bus at one end and the isolated phase bus on the other.Each bolt must be-torqued to 40 foot-pounds.
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| A total of 240 bolts are required to complete the installation of all flexible links between the each of three phases of the main generator buses and their associated isolated phase bus.ISO-PHASE DUCT AREA I SO-PHASE OVCT (bock side of ores)LINK T CAME LOOSE I SO-PHASE L INKS (olde vIew)80LTS LINKS 8OLTS I SO-PHASE BVS L INKS (front sIde of work cree)SPACER~I SO-PHASE BVS IQT SHAN Safet Anal sis The UFSAR analysis for a transient of this type assumes a total loss of load without a.direct or immediate reactor trip.'n this event, a reactor-trip occurred upon receipt of the turbine trip.The UFSAR conclusion was that this event poses no hazard to the integrity of the reactor coolant system and steam system.No other engineered safety systems or reactor protection systems actuated or were required to actuate during or after the trip.Therefore, the health and safety of the public were not affected.IV..CORRECTIVE ACTIONS All 240 connecting bolts on the main generator flexible links were checked for proper torque.2.The main generator was megger tested with satisfactory results.3.The procedure used to install the mai:n generator flexible links will be reviewed to determine necessary work process improvements.
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| These improvements, if necessary, will be completed piior to the next outage requiring work on these links.
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| 4l~, Ct' LZCENS1EVENT REPORT (LER)TEXONTZNUATZON FACILITY NAME TURKEY POINT UNIT 4 DOCKET NUMBER LER NOMBER PAGE NO.0500025l 94-006-00 04 OF 04 V.ADD ZT ZONAL INFORMATION 4 EIIS Codes are shown in the format[EIIS SYSTEM: IEEE component function identifier, second component function identifier (if appropriate)].
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| No other LERs were issued during the past two y'ears for a personnel error caused reactor trip.
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| 0}} | | 0}} |
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Category:LICENSEE EVENT REPORT (SEE ALSO AO
MONTHYEARML17355A3891999-07-20020 July 1999
LER 99-001-00:on 990623,manual Rt from 100% Power Following Multiple Control Rod Drops Was Noted.Caused by Manual Action Taken by Reactor Control Operator.Inspected & Repaired Stationary Gripper Regulating Cards.With 990720 Ltr
ML17354B1921998-11-18018 November 1998
LER 98-007-00:on 981020,containment Purge Supply,Valve Opened Wider than TS Limit.Caused by Improper Setting of Mechanical Stops.Incorporated Improved Standard Method of Measuring Angular Valve Position Into Sp.With 981118 Ltr
ML17354B1361998-10-16016 October 1998
LER 98-004-00:on 980921,automatic Reactor Trip Occurred. Caused by Inadequate re-correlation of Intermediate Range Neutron Flux Instrumentation Reactor Trip Bistable. Enhanced Applicable Plant Procedures.With 981016 Ltr
ML17354B0341998-07-15015 July 1998
LER 98-003-00:on 980619,discovered That Auxiliary Feedwater Sys Was Inoperable Due to Inadequate Inservice Testing of Valves.Caused by Misunderstanding of Testing Criteria.Util Revised Procedures & Verified Operability of Valves
ML17354A9841998-06-18018 June 1998
LER 97-007-01:on 970730,automatic Reactor Trip Occurred Due to Closure of B Msiv.Caused by Failed BFD22S Relay.Six Relays on 3A,3B & 3C MSIVs Were Replaced & Implemented Plant Change to Disable Electronic Trip Function on 3 AFW Pumps
ML17354A9741998-06-0909 June 1998
LER 98-002-00:on 980513,discovered Potential LOCA-initiated Electrical Fault Which Places ECCS Outside Design Basis. Caused by Inadequate Review of Effect on non-safety Circuit failures.Re-powered PC-*-600A Relays
ML17354A8511998-03-24024 March 1998
LER 97-009-01:on 971114,discovered That CR Console Switch for 3B Sgfp Was Not in Start Position.Caused by Inadequate Procedural Guidance.Revised Procedures 3/4-OP-074,informed Personnel of Event & Performed Walkdown of CR
ML17354A8441998-03-18018 March 1998
LER 98-001-00:on 980216,manual Reactor Trip Occurred Due to Loss of Turbine Control Oil Pressure W/Steam Leak in Auxiliary Feedwater Steam Supply Piping.Auxiliary Governor Maint Instructions Will Be revised.W/980318 Ltr
ML17354A7361997-12-12012 December 1997
LER 97-009-01:on 971114,identified That CR Console Switch for 3B SG Feedwater Pump Was Not in Start Position.Caused by Inadequate Procedural Guidance.Procedures 3/4-OP-074,SGFP Were revised.W/971212 Ltr
ML17354A6801997-10-0808 October 1997
LER 97-008-00:on 970909,containment Sump Debris Screens Outside Design Basis Due to Stress Damage Was Discovered. Caused by Inadequate Procedural Guidance & Personnel Error. Discrepancies Found on Screens corrected.W/971008 Ltr
ML17354A6121997-08-29029 August 1997
LER 97-007-00:on 970730,automatic Reactor Trip Occurred. Caused by Closure of B Main Steam Isolation Valve.Failed W Relay & Equivalent Relays Were replaced.W/970829 Ltr
ML17354A6081997-08-18018 August 1997
LER 97-006-00:on 970722,manual Reactor Trip Occurred Due to Failed Rod Control Power Supplies.Replaced Twelve Power Supplies in Rod Control Logic & Power cabinets.W/970818 Ltr
ML17354A5801997-07-14014 July 1997
LER 97-005-00:on 970618,RCP Oil Collection Sys Was Found Outside Design Basis.Caused Because Design Did Not Consider Component Parts to Be Potential Leakage Sources.Entire RCP Oil Collection Sys Was reviewed.W/970714 Ltr
ML17354A5141997-05-22022 May 1997
LER 97-002-00:on 970423,automatic Reactor Tripped.Caused by Actuation of Turbine Overspeed Protection Circuit. Administrative Procedures Governing Inadequate Work Controls Will Be Revised to Capture Lessons learned.W/970522 Ltr
ML17354A5061997-05-0909 May 1997
LER 97-003-00:on 970410,mode Changed W/O Meeting Requirements of TS 3.0.4 Due to Inadequate Procedural Guidance.Night Order Was Issued to Inform Personnel That S/G Blowdown Keylock Switches Were Left in drain.W/970509 Ltr
ML17354A5051997-05-0909 May 1997
LER 97-004-00:on 970411,auxiliary Feedwater Automatic Start Upon Trip of All Main Feedwater Pumps,Occurred.Caused by Mispositioned Valve Closing.Valves Listed as Inappropriately Positioned Were repositioned.W/970509 Ltr
ML17354A4781997-04-25025 April 1997
LER 97-001-00:on 970327,ECCS Recirculation Loop Leakage Was Found to Be in Condition Outside Design Basis Due to Gasket Movement During Installation During Spring 1966 Reassembly. Gasket Replaced & Pump tested.W/970425 Ltr
ML17354A4581997-03-28028 March 1997
LER 97-002-00:on 970303,manual Reactor Trip Following Rod Control Urgent Failure Alarm Occurred.Caused by Phase Failure Detection on Stationary a Circuits of 2BD Rod Control Cabinet.Air Conditioning replaced.W/970328 Ltr
ML17354A4511997-03-26026 March 1997
LER 97-001-00:on 970118,missed Surveillance on CR Position Verification Occurred Due to Inoperable Rod Deviation Monitor.Faulty Circuit Common Connection Was Corrected & Rdm Operability Was restored.W/970326 Ltr
ML17354A4061997-02-0303 February 1997
LER 96-004-03:on 970107,identified Three Instances of Inadequate Surveillance Testing.Caused by Inadequate Surveillance Procedures.Surveillance Procedures Revised
ML17354A3771996-12-27027 December 1996
LER 96-012-00:on 961204,determined Containment Average Temp Being Determined Based on Only Two Temp Elements Instead of Three as Required by Tss.Caused by Log Only Requiring One Entry.Log revised.W/961227 Ltr
ML17354A3261996-11-0606 November 1996
LER 96-011-00:on 961009,potential for Overpressurizing Post Accident Containment Vent Filter Housings Occurred.Caused by Improper Change Mgt.Monitoring Sys Operating Procedures revised.W/961106 Ltr
ML17354A3071996-10-22022 October 1996
LER 96-010-00:on 960924,manual Reactor Shutdown Occurred. Caused by Failed Rod Control Sys Regulation Card in 2AC Power cabinet.2AC Power Cabinet DC Power Supplies,Cabling & Connectors checked.W/961022 Ltr
ML17353A8711996-08-27027 August 1996
LER 96-009-00:on 960729,failed to Reflect Heavy Load Design Info in Procedural Controls.Caused by Failure to Incorporate 1982 Procedure Changes.Suspended Lifting of Heavy Loads & Took Turbine Bldg Crane OOS.W/960827 Ltr
ML17353A7411996-06-18018 June 1996
LER 96-008-00:on 960521,surveillance Method for Testing Emergency Diesel Generators (EDG) Determined Inadequate. Caused by Personnel Error.All Four EDGs Rapid Start Tested & EDG Surveillance Procedures modified.W/960618 Ltr
ML17353A7401996-06-18018 June 1996
LER 96-004-02:on 960524,identified Inadequate Surveillance Testing.Caused by Inadequate Surveillance Procedures.Entered Tech Spec Statements,Tested Required Instruments Functions & Revised Plant procedure.W/960618 Ltr
ML17353A6901996-05-13013 May 1996
LER 96-004-01:on 960220,identified Potential Tech Spec non-compliance Associated W/Surveillance Testing of AFW Actuation Circuitry on Sg.Caused by Inadequate Surveillance Procedures.Procedures revised.W/960513 Ltr
ML17353A6741996-05-0606 May 1996
LER 96-001-00:on 960409,manual Rt Occurred Due to Turbine Governer Control Oil Perturbation.Disassembled & Inspected Governor Valve for Cleanliness & Corrosion products.W/960506 Ltr
ML17353A6651996-04-29029 April 1996
LER 96-007-00:on 960329,inadvertent ESF Actuation Occurred During Refueling Outage Due to Cognitive Personnel Error. Personnel Involved Counseled & Integrated Safeguards Test Procedures Being revised.W/960429 Ltr
ML17353A6601996-04-25025 April 1996
LER 96-006-00:on 960327,manual Rt Occurred Due to 3C Transformer Lockout & Loss of 3B SG Mfp.Replaced SAM Timer Relay in 3AC16.W/960425 Ltr
ML17353A6491996-04-23023 April 1996
LER 96-005-00:on 960326,certain Safety Injection Accumulator Filled Evolutions Resulted in cross-tied Configuration.C/A: Night Order Written & Operations Procedure 3/4-OP-064 revised.W/960423 Ltr
ML17353A6051996-03-18018 March 1996
LER 96-003-00:on 960222,two Arpi Inoperable & TS 3.0.3 Entered.Proposed License Amend Submitted to Revise Allowed Misalignment from +/-12 Steps to =/-18 Steps Between Arpi & Dpi at Less than 90% power.W/960318 Ltr
ML17353A6041996-03-18018 March 1996
LER 96-004-00:on 960220,surveillance Testing of AFW Actuation Circuitry Was Inadequate.Caused by Inadequate Surveillance Procedures.Tested Untested Portions of Actuation Logic for AFW Automatic Start signal.W/960318 Ltr
ML17353A5861996-03-0606 March 1996
LER 96-002-00:on 960209,automatic Turbine Trip/Rt Occurred Due to High SG Level.Caused by Personnel Error.Replaced Both Hinge Pins on B Sgfp Discharge Check valve.W/960306 Ltr
ML17353A5761996-03-0101 March 1996
LER 96-001-00:on 960131,intake CWS Flow Rates Found W/ Potential to Be Less than Required by Design Basis.Caused by Influx of Aquatic Grass & Algae Onto Basket Strainers of Icw Flow Path.Mechanically Cleaned strainers.W/960301 Ltr
ML17353A4451995-11-0909 November 1995
LER 95-007-00:on 951017,manual Rt Occurred Following Drop of Four Control Rods.Caused by Water Intrusion Into Rod Control Power Cabinet 2BD.Inspected Control Power Cabinet 2BD for Other Water damage.W/951109 Ltr
ML17353A4241995-10-12012 October 1995
LER 95-006-00:on 950913,analysis Showed That CCW Exchangers Susceptible to Damage Due to flow-induced Vibration.Ccw Sys Has Been Flow Balanced to Closer tolerances.W/951012 Ltr
ML17353A3601995-09-13013 September 1995
LER 95-005-00:on 950818,containment Pressure Testing Procedure Resulted in Inhibiting Both Trains of Containment Pressure from Initiated Esf.Revised Procedure to Require Testing of Each Train separately.W/950913 Ltr
ML17353A2951995-07-17017 July 1995
LER 94-005-02:on 941103,both Units Outside Design Basis Due to Design Defect in Safeguards Bus Sequencer Test Logic. Resumed Monthly Manual Testing of Sequencer
ML17352B1581995-05-0505 May 1995
LER 95-004-00:on 950407,unit Being Shutdown to Investigate Recurring non-urgent Failure Alarms from Redundant Rod Control Power Supplies.Reactor Manually Tripped.All Four PS-3 Power Supplies replaced.W/950505 Ltr
ML17352B1181995-04-0707 April 1995
LER 95-003-00:on 950309,intake Cooling Water Flow Rate Through CCW Heat Exchangers Fell Below Assumed Design Basis. Caused by an Influx of Aquatic Grass & Algae Onto Basket Strainers.Strainers cleaned.W/950407 Ltr
ML17352B0701995-03-13013 March 1995
LER 95-002-00:on 950215,inadequate Definition of Loops Filled Resulted in Units in Condition Prohibited by Ts. Issued TS Position Statement to Define Term Loops Filled as Used in TS 6.4.1.1.4.W/950313 Ltr
ML17352B0321995-02-0909 February 1995
LER 94-005-01:on 941103,design Defect Found in Safeguards Bus Sequencer Test Logic,Placing Facility Outside Design Basis.Design Mods to Eliminate Software Logic Problems Will Be Implemented During Next Refueling outages.W/950209 Ltr
ML17352B0101995-01-20020 January 1995
LER 94-006-00:on 941226,C Main Feedwater Control Valve Failed Closed,Causing Reactor & Turbine Trips.Caused by Loose Screw Terminal Connection.I/P Transducers Replaced W/ New Model W/Different Design Wire connection.W/950120 Ltr
ML17352A9511994-12-13013 December 1994
LER 94-006-00:on 941130,Unit 4 Tripped Automatically.Caused by Failure of Flexible Link Connection Between Main Generator B Phase Bus & Associated Isolated Phase Bus Bar. All Bolts on Flexible Link checked.W/941213 Ltr
ML17352A8871994-11-10010 November 1994
LER 94-005-00:on 941103,design Defect in Safeguards Bus Sequencer Test Logic Places Both Units Outside Design Basis. Caused by 3A Sequencer Failed to Respond as Expected to Opposite Unit SI signal.W/941110 Ltr
ML17352A8851994-11-10010 November 1994
LER 94-004-00:on 941103,Unit 3 Outside Design Basis Due to Two of Three Required Safety Injection Pumps Inoperable. Control Switches for 3A & 3B Safety Injection Pumps Immediately Returned to automatic.W/941110 Ltr
ML17352A8421994-10-21021 October 1994
LER 94-004-00:on 940923,Unit 4 Tripped Automatically from Rated Power.Caused by Faulty Regulator Transistor.Faulty Backup Power Supply Replaced & Maint History for Power Supplies reviewed.W/941021 Ltr
ML17352A8431994-10-20020 October 1994
LER 94-005-00:on 940924,Unit 4 Manually Tripped.Caused by Manual Actuation.Light Bulb & Socket replaced.W/941020 Ltr
ML17352B1671994-08-16016 August 1994
LER 94-003-00:on 940720 & 21,util Discovered That Several Required Valve Stroke Time Surveillances Had Not Been Performed.Caused by Personnel Error.Personnel Reassigned & Procedures and Surveillance Tracking Software Enhanced
1999-07-20
[Table view]
Category:RO)
MONTHYEARML17355A3891999-07-20020 July 1999
LER 99-001-00:on 990623,manual Rt from 100% Power Following Multiple Control Rod Drops Was Noted.Caused by Manual Action Taken by Reactor Control Operator.Inspected & Repaired Stationary Gripper Regulating Cards.With 990720 Ltr
ML17354B1921998-11-18018 November 1998
LER 98-007-00:on 981020,containment Purge Supply,Valve Opened Wider than TS Limit.Caused by Improper Setting of Mechanical Stops.Incorporated Improved Standard Method of Measuring Angular Valve Position Into Sp.With 981118 Ltr
ML17354B1361998-10-16016 October 1998
LER 98-004-00:on 980921,automatic Reactor Trip Occurred. Caused by Inadequate re-correlation of Intermediate Range Neutron Flux Instrumentation Reactor Trip Bistable. Enhanced Applicable Plant Procedures.With 981016 Ltr
ML17354B0341998-07-15015 July 1998
LER 98-003-00:on 980619,discovered That Auxiliary Feedwater Sys Was Inoperable Due to Inadequate Inservice Testing of Valves.Caused by Misunderstanding of Testing Criteria.Util Revised Procedures & Verified Operability of Valves
ML17354A9841998-06-18018 June 1998
LER 97-007-01:on 970730,automatic Reactor Trip Occurred Due to Closure of B Msiv.Caused by Failed BFD22S Relay.Six Relays on 3A,3B & 3C MSIVs Were Replaced & Implemented Plant Change to Disable Electronic Trip Function on 3 AFW Pumps
ML17354A9741998-06-0909 June 1998
LER 98-002-00:on 980513,discovered Potential LOCA-initiated Electrical Fault Which Places ECCS Outside Design Basis. Caused by Inadequate Review of Effect on non-safety Circuit failures.Re-powered PC-*-600A Relays
ML17354A8511998-03-24024 March 1998
LER 97-009-01:on 971114,discovered That CR Console Switch for 3B Sgfp Was Not in Start Position.Caused by Inadequate Procedural Guidance.Revised Procedures 3/4-OP-074,informed Personnel of Event & Performed Walkdown of CR
ML17354A8441998-03-18018 March 1998
LER 98-001-00:on 980216,manual Reactor Trip Occurred Due to Loss of Turbine Control Oil Pressure W/Steam Leak in Auxiliary Feedwater Steam Supply Piping.Auxiliary Governor Maint Instructions Will Be revised.W/980318 Ltr
ML17354A7361997-12-12012 December 1997
LER 97-009-01:on 971114,identified That CR Console Switch for 3B SG Feedwater Pump Was Not in Start Position.Caused by Inadequate Procedural Guidance.Procedures 3/4-OP-074,SGFP Were revised.W/971212 Ltr
ML17354A6801997-10-0808 October 1997
LER 97-008-00:on 970909,containment Sump Debris Screens Outside Design Basis Due to Stress Damage Was Discovered. Caused by Inadequate Procedural Guidance & Personnel Error. Discrepancies Found on Screens corrected.W/971008 Ltr
ML17354A6121997-08-29029 August 1997
LER 97-007-00:on 970730,automatic Reactor Trip Occurred. Caused by Closure of B Main Steam Isolation Valve.Failed W Relay & Equivalent Relays Were replaced.W/970829 Ltr
ML17354A6081997-08-18018 August 1997
LER 97-006-00:on 970722,manual Reactor Trip Occurred Due to Failed Rod Control Power Supplies.Replaced Twelve Power Supplies in Rod Control Logic & Power cabinets.W/970818 Ltr
ML17354A5801997-07-14014 July 1997
LER 97-005-00:on 970618,RCP Oil Collection Sys Was Found Outside Design Basis.Caused Because Design Did Not Consider Component Parts to Be Potential Leakage Sources.Entire RCP Oil Collection Sys Was reviewed.W/970714 Ltr
ML17354A5141997-05-22022 May 1997
LER 97-002-00:on 970423,automatic Reactor Tripped.Caused by Actuation of Turbine Overspeed Protection Circuit. Administrative Procedures Governing Inadequate Work Controls Will Be Revised to Capture Lessons learned.W/970522 Ltr
ML17354A5061997-05-0909 May 1997
LER 97-003-00:on 970410,mode Changed W/O Meeting Requirements of TS 3.0.4 Due to Inadequate Procedural Guidance.Night Order Was Issued to Inform Personnel That S/G Blowdown Keylock Switches Were Left in drain.W/970509 Ltr
ML17354A5051997-05-0909 May 1997
LER 97-004-00:on 970411,auxiliary Feedwater Automatic Start Upon Trip of All Main Feedwater Pumps,Occurred.Caused by Mispositioned Valve Closing.Valves Listed as Inappropriately Positioned Were repositioned.W/970509 Ltr
ML17354A4781997-04-25025 April 1997
LER 97-001-00:on 970327,ECCS Recirculation Loop Leakage Was Found to Be in Condition Outside Design Basis Due to Gasket Movement During Installation During Spring 1966 Reassembly. Gasket Replaced & Pump tested.W/970425 Ltr
ML17354A4581997-03-28028 March 1997
LER 97-002-00:on 970303,manual Reactor Trip Following Rod Control Urgent Failure Alarm Occurred.Caused by Phase Failure Detection on Stationary a Circuits of 2BD Rod Control Cabinet.Air Conditioning replaced.W/970328 Ltr
ML17354A4511997-03-26026 March 1997
LER 97-001-00:on 970118,missed Surveillance on CR Position Verification Occurred Due to Inoperable Rod Deviation Monitor.Faulty Circuit Common Connection Was Corrected & Rdm Operability Was restored.W/970326 Ltr
ML17354A4061997-02-0303 February 1997
LER 96-004-03:on 970107,identified Three Instances of Inadequate Surveillance Testing.Caused by Inadequate Surveillance Procedures.Surveillance Procedures Revised
ML17354A3771996-12-27027 December 1996
LER 96-012-00:on 961204,determined Containment Average Temp Being Determined Based on Only Two Temp Elements Instead of Three as Required by Tss.Caused by Log Only Requiring One Entry.Log revised.W/961227 Ltr
ML17354A3261996-11-0606 November 1996
LER 96-011-00:on 961009,potential for Overpressurizing Post Accident Containment Vent Filter Housings Occurred.Caused by Improper Change Mgt.Monitoring Sys Operating Procedures revised.W/961106 Ltr
ML17354A3071996-10-22022 October 1996
LER 96-010-00:on 960924,manual Reactor Shutdown Occurred. Caused by Failed Rod Control Sys Regulation Card in 2AC Power cabinet.2AC Power Cabinet DC Power Supplies,Cabling & Connectors checked.W/961022 Ltr
ML17353A8711996-08-27027 August 1996
LER 96-009-00:on 960729,failed to Reflect Heavy Load Design Info in Procedural Controls.Caused by Failure to Incorporate 1982 Procedure Changes.Suspended Lifting of Heavy Loads & Took Turbine Bldg Crane OOS.W/960827 Ltr
ML17353A7411996-06-18018 June 1996
LER 96-008-00:on 960521,surveillance Method for Testing Emergency Diesel Generators (EDG) Determined Inadequate. Caused by Personnel Error.All Four EDGs Rapid Start Tested & EDG Surveillance Procedures modified.W/960618 Ltr
ML17353A7401996-06-18018 June 1996
LER 96-004-02:on 960524,identified Inadequate Surveillance Testing.Caused by Inadequate Surveillance Procedures.Entered Tech Spec Statements,Tested Required Instruments Functions & Revised Plant procedure.W/960618 Ltr
ML17353A6901996-05-13013 May 1996
LER 96-004-01:on 960220,identified Potential Tech Spec non-compliance Associated W/Surveillance Testing of AFW Actuation Circuitry on Sg.Caused by Inadequate Surveillance Procedures.Procedures revised.W/960513 Ltr
ML17353A6741996-05-0606 May 1996
LER 96-001-00:on 960409,manual Rt Occurred Due to Turbine Governer Control Oil Perturbation.Disassembled & Inspected Governor Valve for Cleanliness & Corrosion products.W/960506 Ltr
ML17353A6651996-04-29029 April 1996
LER 96-007-00:on 960329,inadvertent ESF Actuation Occurred During Refueling Outage Due to Cognitive Personnel Error. Personnel Involved Counseled & Integrated Safeguards Test Procedures Being revised.W/960429 Ltr
ML17353A6601996-04-25025 April 1996
LER 96-006-00:on 960327,manual Rt Occurred Due to 3C Transformer Lockout & Loss of 3B SG Mfp.Replaced SAM Timer Relay in 3AC16.W/960425 Ltr
ML17353A6491996-04-23023 April 1996
LER 96-005-00:on 960326,certain Safety Injection Accumulator Filled Evolutions Resulted in cross-tied Configuration.C/A: Night Order Written & Operations Procedure 3/4-OP-064 revised.W/960423 Ltr
ML17353A6051996-03-18018 March 1996
LER 96-003-00:on 960222,two Arpi Inoperable & TS 3.0.3 Entered.Proposed License Amend Submitted to Revise Allowed Misalignment from +/-12 Steps to =/-18 Steps Between Arpi & Dpi at Less than 90% power.W/960318 Ltr
ML17353A6041996-03-18018 March 1996
LER 96-004-00:on 960220,surveillance Testing of AFW Actuation Circuitry Was Inadequate.Caused by Inadequate Surveillance Procedures.Tested Untested Portions of Actuation Logic for AFW Automatic Start signal.W/960318 Ltr
ML17353A5861996-03-0606 March 1996
LER 96-002-00:on 960209,automatic Turbine Trip/Rt Occurred Due to High SG Level.Caused by Personnel Error.Replaced Both Hinge Pins on B Sgfp Discharge Check valve.W/960306 Ltr
ML17353A5761996-03-0101 March 1996
LER 96-001-00:on 960131,intake CWS Flow Rates Found W/ Potential to Be Less than Required by Design Basis.Caused by Influx of Aquatic Grass & Algae Onto Basket Strainers of Icw Flow Path.Mechanically Cleaned strainers.W/960301 Ltr
ML17353A4451995-11-0909 November 1995
LER 95-007-00:on 951017,manual Rt Occurred Following Drop of Four Control Rods.Caused by Water Intrusion Into Rod Control Power Cabinet 2BD.Inspected Control Power Cabinet 2BD for Other Water damage.W/951109 Ltr
ML17353A4241995-10-12012 October 1995
LER 95-006-00:on 950913,analysis Showed That CCW Exchangers Susceptible to Damage Due to flow-induced Vibration.Ccw Sys Has Been Flow Balanced to Closer tolerances.W/951012 Ltr
ML17353A3601995-09-13013 September 1995
LER 95-005-00:on 950818,containment Pressure Testing Procedure Resulted in Inhibiting Both Trains of Containment Pressure from Initiated Esf.Revised Procedure to Require Testing of Each Train separately.W/950913 Ltr
ML17353A2951995-07-17017 July 1995
LER 94-005-02:on 941103,both Units Outside Design Basis Due to Design Defect in Safeguards Bus Sequencer Test Logic. Resumed Monthly Manual Testing of Sequencer
ML17352B1581995-05-0505 May 1995
LER 95-004-00:on 950407,unit Being Shutdown to Investigate Recurring non-urgent Failure Alarms from Redundant Rod Control Power Supplies.Reactor Manually Tripped.All Four PS-3 Power Supplies replaced.W/950505 Ltr
ML17352B1181995-04-0707 April 1995
LER 95-003-00:on 950309,intake Cooling Water Flow Rate Through CCW Heat Exchangers Fell Below Assumed Design Basis. Caused by an Influx of Aquatic Grass & Algae Onto Basket Strainers.Strainers cleaned.W/950407 Ltr
ML17352B0701995-03-13013 March 1995
LER 95-002-00:on 950215,inadequate Definition of Loops Filled Resulted in Units in Condition Prohibited by Ts. Issued TS Position Statement to Define Term Loops Filled as Used in TS 6.4.1.1.4.W/950313 Ltr
ML17352B0321995-02-0909 February 1995
LER 94-005-01:on 941103,design Defect Found in Safeguards Bus Sequencer Test Logic,Placing Facility Outside Design Basis.Design Mods to Eliminate Software Logic Problems Will Be Implemented During Next Refueling outages.W/950209 Ltr
ML17352B0101995-01-20020 January 1995
LER 94-006-00:on 941226,C Main Feedwater Control Valve Failed Closed,Causing Reactor & Turbine Trips.Caused by Loose Screw Terminal Connection.I/P Transducers Replaced W/ New Model W/Different Design Wire connection.W/950120 Ltr
ML17352A9511994-12-13013 December 1994
LER 94-006-00:on 941130,Unit 4 Tripped Automatically.Caused by Failure of Flexible Link Connection Between Main Generator B Phase Bus & Associated Isolated Phase Bus Bar. All Bolts on Flexible Link checked.W/941213 Ltr
ML17352A8871994-11-10010 November 1994
LER 94-005-00:on 941103,design Defect in Safeguards Bus Sequencer Test Logic Places Both Units Outside Design Basis. Caused by 3A Sequencer Failed to Respond as Expected to Opposite Unit SI signal.W/941110 Ltr
ML17352A8851994-11-10010 November 1994
LER 94-004-00:on 941103,Unit 3 Outside Design Basis Due to Two of Three Required Safety Injection Pumps Inoperable. Control Switches for 3A & 3B Safety Injection Pumps Immediately Returned to automatic.W/941110 Ltr
ML17352A8421994-10-21021 October 1994
LER 94-004-00:on 940923,Unit 4 Tripped Automatically from Rated Power.Caused by Faulty Regulator Transistor.Faulty Backup Power Supply Replaced & Maint History for Power Supplies reviewed.W/941021 Ltr
ML17352A8431994-10-20020 October 1994
LER 94-005-00:on 940924,Unit 4 Manually Tripped.Caused by Manual Actuation.Light Bulb & Socket replaced.W/941020 Ltr
ML17352B1671994-08-16016 August 1994
LER 94-003-00:on 940720 & 21,util Discovered That Several Required Valve Stroke Time Surveillances Had Not Been Performed.Caused by Personnel Error.Personnel Reassigned & Procedures and Surveillance Tracking Software Enhanced
1999-07-20
[Table view]
Category:TEXT-SAFETY REPORT
MONTHYEARML20217L9371999-10-20020 October 1999
Safety Evaluation Supporting Licensee Proposed Alternative from Certain Requirements of ASME Code,Section XI for First 10-Yr Interval Request for Relief for Containment Inservice Insp Program
ML17355A4471999-09-30030 September 1999
Monthly Operating Repts for Sept 1999 for Turkey Point,Units 3 & 4.With 991008 Ltr
ML17355A4121999-08-31031 August 1999
Monthly Operating Repts for Aug 1999 for Turkey Point,Units 3 & 4.With 990909 Ltr
ML17355A3981999-07-31031 July 1999
Monthly Operating Repts for July 1999 for Turkey Point,Units 3 & 4.With 990809 Ltr
ML17355A3891999-07-20020 July 1999
LER 99-001-00:on 990623,manual Rt from 100% Power Following Multiple Control Rod Drops Was Noted.Caused by Manual Action Taken by Reactor Control Operator.Inspected & Repaired Stationary Gripper Regulating Cards.With 990720 Ltr
ML17355A3841999-06-30030 June 1999
Monthly Operating Repts for June 1999 for Turkey Point,Units 3 & 4.With 990713 Ltr
ML17355A3681999-06-30030 June 1999
Revised Update to Topical QA Rept, Dtd June 1999
ML17355A3611999-06-30030 June 1999
Refueling Outage ISI Rept.
ML17355A3511999-05-31031 May 1999
Monthly Operating Repts for May 1999 for Turkey Point,Units 3 & 4.With 990609 Ltr
ML17355A3331999-04-30030 April 1999
Monthly Operating Repts for Apr 1999 for Turkey Point,Units 3 & 4.With 990511 Ltr
ML20217B9871999-04-0808 April 1999
Changes,Tests & Experiments Made as Allowed by 10CFR50.59 for Period Covering 971014-990408
ML17355A2881999-04-0505 April 1999
COLR for Turkey Point Unit 4 Cycle 18.
ML17355A2911999-03-31031 March 1999
Monthly Operating Repts for Mar 1999 for Turkey Point,Units 3 & 4.With 990414 Ltr
ML17355A2551999-02-28028 February 1999
Monthly Operating Repts for Feb 1999 for Turkey Point Nuclear Power Plant,Units 3 & 4.With 990315 Ltr
ML17355A2261999-01-31031 January 1999
Monthly Operating Repts for Jan 1999 for Turkey Point,Units 3 & 4.With 990211 Ltr
ML17355A2201999-01-20020 January 1999
Refueling Outage ISI Rept.
ML17355A1911998-12-31031 December 1998
Monthly Operating Repts for Dec 1998 for Turkey Point,Units 3 & 4.With 990112 Ltr
ML18008A0461998-11-30030 November 1998
Monthly Operating Repts for Nov 1998 for Turkey Point,Units 3 & 4.With 981209 Ltr
ML17354B1921998-11-18018 November 1998
LER 98-007-00:on 981020,containment Purge Supply,Valve Opened Wider than TS Limit.Caused by Improper Setting of Mechanical Stops.Incorporated Improved Standard Method of Measuring Angular Valve Position Into Sp.With 981118 Ltr
ML17354B1891998-11-0909 November 1998
Simulatory Certification Update 2.
ML17354B1901998-10-31031 October 1998
Monthly Operating Repts for Oct 1998 for Turkey Point,Units 3 & 4.With 981112 Ltr
ML17354B1591998-10-23023 October 1998
COLR for Turkey Point Unit 3 Cycle 17.
ML17354B1361998-10-16016 October 1998
LER 98-004-00:on 980921,automatic Reactor Trip Occurred. Caused by Inadequate re-correlation of Intermediate Range Neutron Flux Instrumentation Reactor Trip Bistable. Enhanced Applicable Plant Procedures.With 981016 Ltr
ML17354B1311998-09-30030 September 1998
Monthly Operating Repts for Sept 1998 for Turkey Point Unit 3 & 4.With 981012 Ltr
ML17354B0971998-09-0909 September 1998
Part 21 Rept Re Possible Machining Defect in Certain One Inch Stainless Steel Swagelok Front Ferrules,Part Number SS-1613-1.Caused by Tubing Slipping Out of Fitting at Three Times Working Pressure of Tubing.Notified Affected Utils
ML17354B0981998-08-31031 August 1998
Monthly Operating Repts for Aug 1998 for Turkey Points,Units 3 & 4.With 980915 Ltr
ML17354B0771998-07-31031 July 1998
Monthly Operating Repts for July 1998 for Turkey Point,Units 3 & 4.W/980810 Ltr
ML17354B0341998-07-15015 July 1998
LER 98-003-00:on 980619,discovered That Auxiliary Feedwater Sys Was Inoperable Due to Inadequate Inservice Testing of Valves.Caused by Misunderstanding of Testing Criteria.Util Revised Procedures & Verified Operability of Valves
ML17354B0241998-06-30030 June 1998
Monthly Operating Repts for June 1998 for Turkey Point,Units 3 & 4.W/980709 Ltr
ML17354B0171998-06-29029 June 1998
Rev 1 to PTN-FPER-97-013, Evaluation of Turbine Lube Oil Fire.
ML17354A9841998-06-18018 June 1998
LER 97-007-01:on 970730,automatic Reactor Trip Occurred Due to Closure of B Msiv.Caused by Failed BFD22S Relay.Six Relays on 3A,3B & 3C MSIVs Were Replaced & Implemented Plant Change to Disable Electronic Trip Function on 3 AFW Pumps
ML17354A9741998-06-0909 June 1998
LER 98-002-00:on 980513,discovered Potential LOCA-initiated Electrical Fault Which Places ECCS Outside Design Basis. Caused by Inadequate Review of Effect on non-safety Circuit failures.Re-powered PC-*-600A Relays
ML20248F7441998-05-31031 May 1998
Reactor Vessel Working Group,Response to RAI Regarding Reactor Pressure Vessel Integrity
ML17354A9711998-05-31031 May 1998
Monthly Operating Repts for Turkey Point,Units 3 & 4. W/980611 Ltr
ML17354A9231998-04-30030 April 1998
Monthly Operating Repts for Apr 1998 for Turkey Point,Units 3 & 4.W/980511 Ltr
ML17354A8821998-03-31031 March 1998
Monthly Operating Repts for Mar 1998 for Turkey Point,Units 3 & 4.W/980409 Ltr
ML17354A8511998-03-24024 March 1998
LER 97-009-01:on 971114,discovered That CR Console Switch for 3B Sgfp Was Not in Start Position.Caused by Inadequate Procedural Guidance.Revised Procedures 3/4-OP-074,informed Personnel of Event & Performed Walkdown of CR
ML17354B0001998-03-18018 March 1998
Florida Power & Light Topical Quality Asurance Rept, Dtd June 1998
ML17354A8441998-03-18018 March 1998
LER 98-001-00:on 980216,manual Reactor Trip Occurred Due to Loss of Turbine Control Oil Pressure W/Steam Leak in Auxiliary Feedwater Steam Supply Piping.Auxiliary Governor Maint Instructions Will Be revised.W/980318 Ltr
ML17354A8311998-02-28028 February 1998
Monthly Operating Repts for Feb 1998 for Turkey Point,Units 3 & 4.W/980311 Ltr
ML17354A7871998-01-31031 January 1998
Monthly Operating Repts for Jan 1998 for Turkey Point,Units 3 & 4.W/980209 Ltr
ML17354A7581997-12-31031 December 1997
Monthly Operating Repts for Dec 1997 for Turkey Point,Unit 3 & 4.W/980112 Ltr
ML17354A7361997-12-12012 December 1997
LER 97-009-01:on 971114,identified That CR Console Switch for 3B SG Feedwater Pump Was Not in Start Position.Caused by Inadequate Procedural Guidance.Procedures 3/4-OP-074,SGFP Were revised.W/971212 Ltr
ML17354A7381997-11-30030 November 1997
Monthly Operating Repts for Nov 1997 for Turkey Point,Units 3 & 4.W/971215 Ltr
ML17354A7211997-10-31031 October 1997
Monthly Operating Repts for Oct 1997 for Turkey Point,Units 3 & 4.W/971114 Ltr
ML17354A7491997-10-13013 October 1997
SG Insp Rept.
ML17354A8851997-10-13013 October 1997
FPL Units 3 & 4 Changes,Tests & Experiments Made as Allowed by 10CFR50.59 for Period Covering 960408-971013.
ML17354A6801997-10-0808 October 1997
LER 97-008-00:on 970909,containment Sump Debris Screens Outside Design Basis Due to Stress Damage Was Discovered. Caused by Inadequate Procedural Guidance & Personnel Error. Discrepancies Found on Screens corrected.W/971008 Ltr
ML17354A6791997-10-0606 October 1997
COLR Unit 4 Cycle 17, for Turkey Point
ML17354A6811997-09-30030 September 1997
Monthly Operating Repts for Sept 1997 for Turkey Point,Units 3 & 4.W/971009 Ltr
1999-09-30
[Table view] |
Text
P R.ICOR.I RIDS PROC!'.SSI EY'ACCLLERATED REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9412210168 DOC.DATE: 94/12/13 NOTARIZED: NO DOCKET FACIL:50-251 Turkey Point Plant, Unit 4, Florida Power and Light C 05000251 AUTH. NAME AUTHOR AFFILIATION KNORR,J.E. Florida Power & Light Co.
PLUNKETT,T.F. Florida Power & Light Co.
RECIP.NAME RECIPIENT AFFILIATION
SUBJECT:
LER 94-006-00:on '941130,Unit -4 tripped automatically. Caused by failure of flexible link connection between main generator B phase bus & associated isolated phase bus bar.
All bolts on flexible link checked.W/941213 ltr.
DISTRIBUTION CODE: IE22T COPIES RECEIVED:LTR ENCL ) SIZE:
TITLE: 50.73/50.9 Licensee Event Report (LER), Inciden&Rpt, etc.
NOTES RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-2 PD 1 1 CROTEAU,R 1 1 INTERNAL: AEOJ~3-S -D JRA'B 2 2 AEOD/S PD/RRAB 1 MI-LE=GENT 02 1 1 NRR/DE/ECGB 1 NRR/DE/EELB 1 1 NRR/DE/EMEB 1 NRR/DI S P/PI PB 1 1 NRR/DOPS/OECB 1 NRR/DRCH/HHFB 1 1 NRR/DRCH/HICB 1 NRR/DRCH/HOLB 1 1 NRR/DRSS/PRPB 2 NRR/DSSA/SPLB '1 1 'RR/DSSA/SRXB 1 RES/DSIR/EIB 1 1 RGN2 FILE 01 1 EXTERNAL: L ST LOBBY WARD 1 1 LITCO BRYCE,J H 2 2 NOAC MURPHY,G.A 1 1 NOAC POOREiW 1 1 NRC PDR 1 1 NUDOCS FULL TXT 1 1 DOCUMENT'I'S YOTE TO ALL"Rl DS" RECIPIENTS:
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Cl I L-94-311 10 CFR 50 '3 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, 'D. C. 20555 Gentlemen:
Re: Turkey Point Unit 4 Docket No. 50-251 Reportable Event: 94-006-00 Automatic Reactor Trip Due to Main Generator Ground The attached =-
Licensee Event Report, 251/94-006-00, is being provided in accordance with 10 CFR 50.73(a) (2) (iv) .
Xf there are any questions, please contact us.
Very truly yours,
/7~'I T. F. Plunkett Vice President Turkey Point Plant jek enclosure cc Stewart USNRC D. Ebneter, Regional Administrator, Region II, Thomas P. Johnson, Senior Resident Inspector, USNRC, Turkey Point Plant 943.223.03.68 5'43.21 i PDR ADOCVi 050r'r0>53 8 PDR an FPL Group company
Il LICENSEE EVENT REPORT (LER)
'I FACILZTY NAME (I ) DOCKET NUMBER (2) PAGE (3)
TURKEY POINT UNIT 4 05000251 oF 1 3 TITLE (4)
AUTOMATIC REACTOR TRIP DUE TO MAIN GENERATOR GROUND EVENT DATE (5) LER Nl&DER(6) RPT DATE (?) OTHER PACILITIES INV. (8)
MON DAY SEQ S RS 'ON DAY PACILITY NAMES DOCKET S (S) 30 94 '4 006 00 12 13 94 OPERATING MODE (9) 1 POWER LEVEL (10) 100%
10 CFR 50.73 a 2 iv LICENSEE CONTACT FOR THIS LER (12)
TELEPHONE N(B(BER J. -E. Knorr, Regulation and Compliance Engineer 305-246-6757 COMPLETE ONE LINE FOR EACH COMPONENT PAZLURE DESCRIBED IN THIS REPORT (13)
CAUSE SYSTEM COMPONENT NPRDS? CAUSE SYSTEM NPRDS'?
COMPONENT SUPPLEMENTAL REPORT EXPECTED (14) NO gl YES 'C3 EXPECTED SUBM I5 5 ION MONTH DAY DATE (15)
(if yee, coaylete EXPECTED SUBMISSION DATE)
ABSTRACT (16)
On November 30,. 1994, Unit 4 tripped automatically because of the failure of a flexible link connection between the main generator B phase bus and its associated isolated phase bus bar. The flexible link came loose and grounded against the isolated phase bus duct work causing a generator lockout, turbine trip and automatic reactor trip. At the time of the Unit 4 was in Mode 1 operating at approximately 100% power. All systemstrip responded as expected to the automatic reactor trip.
LICENSEEVENT REPORT (LER) TEEONTINUATION FACILITY NAME DOCKET NOMBER LER NUMBER PAGE NO.
TURKEY POINT UNIT. 4 05000251 94-006-00 02 OF 04 I. DESCRIPTION OF THE EVENT On November 30, 1994, at 1542, Unit 4 tripped automatically because of the failure of a flexible link connection between the main generator B phase bus and its associated isolated phase bus bar. Unit 4 was in Mode 1 operating at approximately 100% power steady state operation. When the connection failed, the flexible link fell against the adjacent isolated phase bus duct thereby grounding that phase, causing a main generator ground, generator lockout, turbine trip and an automatic reactor trip. All safety systems responded as expected to the reactor trip. Reactor trip recovery actions were completed in accordance with. procedure 4-EOP-E-O, Reactor Trip or Safety Injection.
The ground current was limited due to the design value for the ground circuit for the main generator. Therefore, no damage occurred to the bus work or the isolated phase bus.
The NRCOC was notified at 1648 on November 30, 1994. This event is being reported in accordance with 10 CFR 50.73(a)(iv), as an automatic actuation of the reactor protection system.
II. CAUSE OF THE EVENT The cause of the failure of the flexible link connection was a personnel error resulting in an inadequate torque of the bolted connection. The required torque for the connection was 40 foot-pounds. These connections were disconnected, cleaned and reinstalled as part of the maintenance scheduled for this equipment during the recent refueling outage. After the trip, one flexible link was found fallen away from the bus and touching the isolated phase bus ductwork. Five bolts on the north face of the B phase of the generator bus were found loose.
Procedure O-PME-090.1 Power Generator Grounding For 'Safety and Testing Preparation, was used as work control for the flexible link removal and reinstallation'his work control was not adequate to ensure all flexible link connections were retorqued to 40 foot pounds. A contributor to the event was more than one worker completing torquing of the bolts on the B phase flexible links without verification of each link during .the process.
The A and C phases were each completed by one worker.
III. ANALYSIS OF THE EVENT S stem Descri tion The main generator output voltage at Turkey Point Unit 4 is a nominal 22 kV. The grounding circuit of the main generator and isolated phase bus is designed to limit current during a ground fault. A primary main generator ground neutral relay monitors the generator ground neutral which is connected through a transformer and resistor between ground and the neutral of the wye connected generator. A secondary generator ground voltage phase imbalance on the generator output to indicate a relay'onitors ground by sensing the change in the phase voltages when a ground is present on any of the phases of the generator. Both relays actuated as expected for an actual generator ground. These relays initiate a generator lockout. As discussed above, this relay operation ultimately results in an automatic reactor trip.
LICENSE~NT REPORT (LER). TEX9QNTINUATION FACILITY NAME DOCKET NUMBER LER NUMBER PAGE No.
TURKEY POINT UNIT 4 05000251 94-006-00 03 OF 04 Each output phase of the main generator is connected to its associated isolated phase bus by a series of 20 pairs of flexible links. Each pair of links is installed back to back and requires two bolts at each end to connect it,to the main generator bus at one end and the isolated phase bus on the other. Each bolt must be-torqued to 40 foot-pounds. A total of 240 bolts are required to complete the installation of all flexible links between the each of three phases of the main generator buses and their associated isolated phase bus.
ISO-PHASE DUCT AREA I SO-PHASE L INKS (olde vIew)
I SO-PHASE OVCT (bock side of ores)
LINK T CAME LOOSE 80LTS LINKS 8OLTS I SO-PHASE BVS SPACER IQT SHAN
~ I SO-PHASE BVS L INKS (front sIde of work cree)
Safet Anal sis analysis for a transient of this type assumes a total loss of load The UFSAR without a. direct or immediate reactor trip. 'n this event, a reactor -trip occurred upon receipt of the turbine trip. The UFSAR conclusion was that this event poses no hazard to the integrity of the reactor coolant system and steam system.
No other engineered safety systems or reactor protection systems actuated or were required to actuate during or after the trip. Therefore, the health and safety of the public were not affected.
IV.. CORRECTIVE ACTIONS All 240 connecting bolts on the main generator flexible links were checked for proper torque.
- 2. The main generator was megger tested with satisfactory results.
- 3. The procedure used to install the mai:n generator flexible links will be reviewed to determine necessary work process improvements. These improvements, if necessary, will be completed piior to the next outage requiring work on these links.
4l ~,
Ct'
LZCENS1EVENT REPORT (LER) TEXONTZNUATZON FACILITY NAME DOCKET NUMBER LER NOMBER PAGE NO.
TURKEY POINT UNIT 4 0500025l 94-006-00 04 OF 04 V. ADDZT ZONAL INFORMATION 4
EIIS Codes are shown in the format [EIIS SYSTEM: IEEE component function identifier, second component function identifier (if appropriate)].
No other LERs were issued during the past two y'ears for a personnel error caused reactor trip.
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