|
---|
Category:LICENSEE EVENT REPORT (SEE ALSO AO
MONTHYEARML20024J2481994-10-0707 October 1994 LER 94-012-00:on 940907,discovered Failure to Perform TS Surveillance Requirements.Caused by Misunderstanding & Inadequate Technical Reviews.Ts Bases for 3/4.8.1 Will Be revised.W/941007 Ltr ML20029E5581994-05-13013 May 1994 LER 94-005-00:on 940415,dicovered That Several Valves Were Not Being Tested Per Requirements of ASME Section Xi.Caused by Inappropriate Action.Corrective Action:Pump & Valve Team Has Been Formed to Perform in Depth reviews.W/940513 Ltr ML20029D9941994-05-11011 May 1994 LER 94-006-00:on 940415,determined That on 921103, Unidentified RCS Leak Rate of Greater than 1 Gpm Occurred. Caused by Error in RCS Mass Balance Equation.Approved Temporary Change to Procedure OP-903-024.W/940511 Ltr ML20045H4731993-07-15015 July 1993 LER 93-002-00:on 930615,reactor Tripped Due to High SG Level Caused by Failure of Feedwater Control Sys.Caused by Failure of Square Root Extractor in Feedwater Flow Circuit.Failed Components Replaced & Alarm Setpoints reviewed.W/930715 Ltr ML20029B6381991-03-0808 March 1991 LER 89-007-01:on 890331,inadequate Design of Air Accumulators Due to Inadequate Review of Design Requirements Implemented as Part of post-TMI Action Plan.Design Change 3195 Phase I implemented.W/910308 Ltr ML20029A8471991-02-28028 February 1991 LER 90-019-01:on 901212,both Trains of Control Room Heating Ventilation & Air Conditioning Sys Inoperable Due to Breach in Control Room Envelope.Caused by Air Flow Past Retaining Angle.Leakage Paths repaired.W/910228 Ltr ML20028G9631990-10-0202 October 1990 LER 90-013-00:on 900903,unsampled Gas Released from Gaseous Waste Mgt Sys.Caused by Internal Leakage Past Discharge Isolation Valves.Administrative Controls in Place to Ensure That Gas Decay Tanks Sampled Prior to release.W/901002 Ltr ML20028G9211990-09-24024 September 1990 LER 90-012-00:on 900825,reactor Tripped Due to Lightning Strike.Station Mod Request Issued to Provide Uninterruptable Power Source for Steam Bypass Control sys.W/900924 Ltr ML20044A6661990-06-27027 June 1990 LER 90-006-00:on 841218.determined That Shutdown Cooling Sys Relief Valve Setpoint Not Set,Per Tech Spec Requirement. Caused by Procedural Inadequacy.Procedure MM-007-006 revised.W/900627 Ltr ML20043G1961990-06-15015 June 1990 LER 90-001-01:on 900223,discovered Controlled Ventilation Area Sys Airlock Doors D-170 & D-171 Open.Caused by Inadequate Administrative Controls.Procedural Instructions Developed to Govern Control of Air Lock doors.W/900615 Ltr ML20043G2041990-06-14014 June 1990 LER 89-006-01:on 870105,safety Class Break Requirements Not Met.Caused by Programmatic Breakdown in Administrative Controls.Valves Closed & Design Drawings & Procedures revised.W/900614 Ltr ML20043B1121990-05-21021 May 1990 LER 90-005-00:on 900420,condenser Vacuum Pump Discharge Wide Range Gas Monitor Setpoint Discovered to Be Incorrect.Caused by Inadequate Change Procedure for Data Base Manual. Administrative Procedures revised.W/900521 Ltr ML20042F7501990-05-0707 May 1990 LER 90-004-00:on 900408,partial Actuation of Emergency Feedwater Sys Occurred During Scheduled Test of Plant Protection Sys.Caused by Test Circuit Malfunction.Relay Hold Pushbutton Assembly replaced.W/900507 Ltr ML20012D6671990-03-23023 March 1990 LER 90-001-00:on 900223,discovered Controlled Ventilation Area Sys Airlock Doors D-170 & D-171 Open.Caused by Inadequate Administrative Controls.Procedural Instructions Will Be developed.W/900323 Ltr ML19354E0181990-01-22022 January 1990 LER 89-024-00:on 891223,manual Trip of Plant Initiated in Response to Decreasing Level in Steam Generator.Caused Probably by Anomaly in Main Feed Regulating Valve Pneumatic Control Sys.Tent Erected Around valve.W/900122 Ltr ML19354E0171990-01-19019 January 1990 LER 89-023-00:on 890927,MSIV 2MS-124B,determined to Have Broken Stem.Caused by MSIV Hydraulic Control Unit Thermal Valve Leakage.Replacement MSIV Stems W/Increased Blend Radius Designed to Decrease Stress installed.W/900119 Ltr ML20005E0971989-12-29029 December 1989 LER 89-017-01:on 890819,automatic Reactor Trip Initiated by Plant Protection Sys Response to Variations in Core Axial Shape Index.Caused by Failure of Pulldown & Lower Gripper Coil Current Sensors.Equipment replaced.W/891229 Ltr ML20011D2541989-12-20020 December 1989 LER 89-022-00:on 891128,plant Operated in Condition Prohibited by Tech Specs When Emergency Diesel Generator a Inoperable More than 24 H.Caused by Personnel Error.Ltr Issued to All Shift supervisors.W/891220 Ltr ML20011F4591989-12-18018 December 1989 LER 89-021-00:on 891116,emergency Diesel Generator a Declared Inoperable When Essential Svcs Chiller a Declared Inoperable W/O Verifying Availability of Offsite Ac Power. Caused by Personnel Error.Supervisor counseled.W/891218 Ltr ML19332C5781989-11-20020 November 1989 LER 89-020-00:on 891031,containment Fan Cooler C Motor Ran in Reverse Direction Reducing Air Flow & Cooling Capacity. Caused by Personnel Not Performing Surveillance Testing. Motor Rewired for Correct Slow Speed operation.W/891120 Ltr ML19327C1111989-11-13013 November 1989 LER 89-002-01:on 890125,discovered That Safety Classification of Instrument Air Tubing That Supplies Outlet Isolation Valves Installed as non-nuclear Safety.Caused by Use of Weld Filler Matl.Tech Spec Change Sent ML19324C4611989-11-13013 November 1989 LER 89-019-00:on 891012,4.16-kV Bus 3A2 Metering Potential Transformer Fuse Door Inadvertently Opened,Causing Feeder Breaker & Supply Breaker to Open & Load Sequencer to Reset. Caused by Personnel Error.Drawers relabeled.W/891113 Ltr ML19327B3511989-10-23023 October 1989 LER 89-018-00:on 890921,while Testing Main Steam Safety Valve,Lift Pressure Found to Be Below Tech Spec Allowable Value.Caused by Error in Judgement by Plant Supervisors. Event Will Be Discussed by superintendent.W/891023 Ltr 1994-05-13
[Table view] Category:RO)
MONTHYEARML20024J2481994-10-0707 October 1994 LER 94-012-00:on 940907,discovered Failure to Perform TS Surveillance Requirements.Caused by Misunderstanding & Inadequate Technical Reviews.Ts Bases for 3/4.8.1 Will Be revised.W/941007 Ltr ML20029E5581994-05-13013 May 1994 LER 94-005-00:on 940415,dicovered That Several Valves Were Not Being Tested Per Requirements of ASME Section Xi.Caused by Inappropriate Action.Corrective Action:Pump & Valve Team Has Been Formed to Perform in Depth reviews.W/940513 Ltr ML20029D9941994-05-11011 May 1994 LER 94-006-00:on 940415,determined That on 921103, Unidentified RCS Leak Rate of Greater than 1 Gpm Occurred. Caused by Error in RCS Mass Balance Equation.Approved Temporary Change to Procedure OP-903-024.W/940511 Ltr ML20045H4731993-07-15015 July 1993 LER 93-002-00:on 930615,reactor Tripped Due to High SG Level Caused by Failure of Feedwater Control Sys.Caused by Failure of Square Root Extractor in Feedwater Flow Circuit.Failed Components Replaced & Alarm Setpoints reviewed.W/930715 Ltr ML20029B6381991-03-0808 March 1991 LER 89-007-01:on 890331,inadequate Design of Air Accumulators Due to Inadequate Review of Design Requirements Implemented as Part of post-TMI Action Plan.Design Change 3195 Phase I implemented.W/910308 Ltr ML20029A8471991-02-28028 February 1991 LER 90-019-01:on 901212,both Trains of Control Room Heating Ventilation & Air Conditioning Sys Inoperable Due to Breach in Control Room Envelope.Caused by Air Flow Past Retaining Angle.Leakage Paths repaired.W/910228 Ltr ML20028G9631990-10-0202 October 1990 LER 90-013-00:on 900903,unsampled Gas Released from Gaseous Waste Mgt Sys.Caused by Internal Leakage Past Discharge Isolation Valves.Administrative Controls in Place to Ensure That Gas Decay Tanks Sampled Prior to release.W/901002 Ltr ML20028G9211990-09-24024 September 1990 LER 90-012-00:on 900825,reactor Tripped Due to Lightning Strike.Station Mod Request Issued to Provide Uninterruptable Power Source for Steam Bypass Control sys.W/900924 Ltr ML20044A6661990-06-27027 June 1990 LER 90-006-00:on 841218.determined That Shutdown Cooling Sys Relief Valve Setpoint Not Set,Per Tech Spec Requirement. Caused by Procedural Inadequacy.Procedure MM-007-006 revised.W/900627 Ltr ML20043G1961990-06-15015 June 1990 LER 90-001-01:on 900223,discovered Controlled Ventilation Area Sys Airlock Doors D-170 & D-171 Open.Caused by Inadequate Administrative Controls.Procedural Instructions Developed to Govern Control of Air Lock doors.W/900615 Ltr ML20043G2041990-06-14014 June 1990 LER 89-006-01:on 870105,safety Class Break Requirements Not Met.Caused by Programmatic Breakdown in Administrative Controls.Valves Closed & Design Drawings & Procedures revised.W/900614 Ltr ML20043B1121990-05-21021 May 1990 LER 90-005-00:on 900420,condenser Vacuum Pump Discharge Wide Range Gas Monitor Setpoint Discovered to Be Incorrect.Caused by Inadequate Change Procedure for Data Base Manual. Administrative Procedures revised.W/900521 Ltr ML20042F7501990-05-0707 May 1990 LER 90-004-00:on 900408,partial Actuation of Emergency Feedwater Sys Occurred During Scheduled Test of Plant Protection Sys.Caused by Test Circuit Malfunction.Relay Hold Pushbutton Assembly replaced.W/900507 Ltr ML20012D6671990-03-23023 March 1990 LER 90-001-00:on 900223,discovered Controlled Ventilation Area Sys Airlock Doors D-170 & D-171 Open.Caused by Inadequate Administrative Controls.Procedural Instructions Will Be developed.W/900323 Ltr ML19354E0181990-01-22022 January 1990 LER 89-024-00:on 891223,manual Trip of Plant Initiated in Response to Decreasing Level in Steam Generator.Caused Probably by Anomaly in Main Feed Regulating Valve Pneumatic Control Sys.Tent Erected Around valve.W/900122 Ltr ML19354E0171990-01-19019 January 1990 LER 89-023-00:on 890927,MSIV 2MS-124B,determined to Have Broken Stem.Caused by MSIV Hydraulic Control Unit Thermal Valve Leakage.Replacement MSIV Stems W/Increased Blend Radius Designed to Decrease Stress installed.W/900119 Ltr ML20005E0971989-12-29029 December 1989 LER 89-017-01:on 890819,automatic Reactor Trip Initiated by Plant Protection Sys Response to Variations in Core Axial Shape Index.Caused by Failure of Pulldown & Lower Gripper Coil Current Sensors.Equipment replaced.W/891229 Ltr ML20011D2541989-12-20020 December 1989 LER 89-022-00:on 891128,plant Operated in Condition Prohibited by Tech Specs When Emergency Diesel Generator a Inoperable More than 24 H.Caused by Personnel Error.Ltr Issued to All Shift supervisors.W/891220 Ltr ML20011F4591989-12-18018 December 1989 LER 89-021-00:on 891116,emergency Diesel Generator a Declared Inoperable When Essential Svcs Chiller a Declared Inoperable W/O Verifying Availability of Offsite Ac Power. Caused by Personnel Error.Supervisor counseled.W/891218 Ltr ML19332C5781989-11-20020 November 1989 LER 89-020-00:on 891031,containment Fan Cooler C Motor Ran in Reverse Direction Reducing Air Flow & Cooling Capacity. Caused by Personnel Not Performing Surveillance Testing. Motor Rewired for Correct Slow Speed operation.W/891120 Ltr ML19327C1111989-11-13013 November 1989 LER 89-002-01:on 890125,discovered That Safety Classification of Instrument Air Tubing That Supplies Outlet Isolation Valves Installed as non-nuclear Safety.Caused by Use of Weld Filler Matl.Tech Spec Change Sent ML19324C4611989-11-13013 November 1989 LER 89-019-00:on 891012,4.16-kV Bus 3A2 Metering Potential Transformer Fuse Door Inadvertently Opened,Causing Feeder Breaker & Supply Breaker to Open & Load Sequencer to Reset. Caused by Personnel Error.Drawers relabeled.W/891113 Ltr ML19327B3511989-10-23023 October 1989 LER 89-018-00:on 890921,while Testing Main Steam Safety Valve,Lift Pressure Found to Be Below Tech Spec Allowable Value.Caused by Error in Judgement by Plant Supervisors. Event Will Be Discussed by superintendent.W/891023 Ltr 1994-05-13
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20217F2891999-10-13013 October 1999 Drill 99-08 Emergency Preparedness Exercise on 991013 ML20217G7211999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for Waterford 3 Ses. with ML20211Q2141999-08-31031 August 1999 Monthly Operating Rept for Aug 1999 for Waterord 3 Ses.With ML20210Q6361999-07-31031 July 1999 Corrected Monthly Operating Rept for July 1999 for Waterford 3 ML20210S0581999-07-31031 July 1999 Monthly Operating Rept for July 1999 for Waterford 3.With ML20210D8951999-07-23023 July 1999 Safety Evaluation Accepting First 10-yr Interval Inservice Insp Plan Requests for Relief ISI-018 - ISI-020 ML20209H3781999-06-30030 June 1999 Monthly Operating Rept for June 1999 for Waterford 3 Ses. with ML20195J8951999-06-17017 June 1999 Safety Evaluation Granting Relief for Listed ISI Parts for Current Interval,Per 10CFR50.55a(g)(5)(iii) ML20207E8631999-06-0303 June 1999 Safety Evaluation Accepting Licensee 990114 Submittal of one-time Request for Relief from ASME B&PV Code IST Requirements for Pressure Safety Valves at Plant,Unit 3 ML20195K3391999-05-31031 May 1999 Monthly Operating Rept for May 1999 for Waterford 3 Ses.With ML20195C3041999-05-28028 May 1999 Annual Rept on Abb CE ECCS Performance Evaluation Models ML20206S7401999-04-30030 April 1999 Monthly Operating Rept for Apr 1999 for Waterford 3.With ML20205T2621999-04-22022 April 1999 LER 99-S02-00:on 990216,contract Employee Inappropriately Granted Unescorted Access to Plant Protected Area.Caused by Personnel Error.Security Personnel Performed Review of Work & Work Area That Individual Was Involved with ML20205N9671999-03-31031 March 1999 Monthly Operating Rept for Mar 1999 for Waterford 3 Ses.With ML20205E8531999-03-30030 March 1999 Corrected Pages COLR 3/4 1-4 & COLR 3/4 2-6 to Rev 1, Cycle 10, Colr ML20205A6331999-03-25025 March 1999 SER Accepting Request to Use Mechanical Nozzle Seal Assemblies as an Alternative Repair Method,Per 10CFR50.55a(a)(3)(i) for Reactor Coolant Sys Applications at Plant,Unit 3 ML20204H1401999-03-23023 March 1999 Rev 1 to Engineering Rept C-NOME-ER-0120, Design Evaluation of Various Applications at Waterford Unit 3 ML20204H1231999-03-22022 March 1999 Rev 1 to Design Rept C-PENG-DR-006, Addendum to Cenc Rept 1444 Analytical Rept for Waterford Unit 3 Piping ML20204H2451999-03-22022 March 1999 Rev 2 to C-NOME-SP-0067, Design Specification for Mechanical Nozzle Seal Assembly (Mnsa) Waterford Unit 3 ML20204F0791999-03-17017 March 1999 Rev 1 to Waterford 3 COLR for Cycle 10 ML20207M9231999-03-12012 March 1999 Amended Part 21 Rept Re Cooper-Bessemer Ksv EDG Power Piston Failure.Total of 198 or More Pistons Have Been Measured at Seven Different Sites.All Potentially Defective Pistons Have Been Removed from Svc Based on Encl Results ML20207F3491999-03-0505 March 1999 LER 99-S01-00:on 990203,contraband Was Discovered in Plant Protected Area.Bottle Was Determined to Have Been There Since Original Plant Construction.Bottle Was Removed & Security Personnel Performed Search of Area.With ML20204B5141999-02-28028 February 1999 Monthly Operating Rept for Feb 1999 for Waterford 3.With ML20203H8591999-02-17017 February 1999 Safety Evaluation Accepting Licensee Second Ten Year ISI Program & Associated Relief Requests for Plant,Unit 3 ML20199H6261999-01-21021 January 1999 Safety Evaluation Accepting Classification of Instrument Air Tubing & Components for Safety Related Valve Top Works.Staff Recommends That EOI Revise Licensing Basis to Permit Incorporation of Change ML20199C9101998-12-31031 December 1998 Monthly Operating Rept for Dec 1998 for Waterford 3.With ML20196F4911998-12-0101 December 1998 SER Accepting Request for Relief ISI2-09 for Waterford Steam Electric Station,Unit 3 & Arkansas Nuclear One,Unit 2 ML20206N4131998-11-30030 November 1998 Monthly Operating Rept for Nov 1998 for Waterford 3.With ML20195C4841998-11-0606 November 1998 SER Accepting QA Program Change to Consolidate Four Existing QA Programs for Arkansas Nuclear One,Grand Gulf Nuclear Station,River Bend Station & Waterford 3 Steam Electric Station Into Single QA Program ML20195E5161998-10-31031 October 1998 Monthly Operating Rept for Oct 1998 for Waterford 3.With ML20155C1351998-10-26026 October 1998 Rev B to Entergy QA Program Manual ML20154K0801998-09-30030 September 1998 Monthly Operating Rept for Sept 1998 for Waterford 3 Ses. with ML20151W8331998-08-31031 August 1998 Monthly Operating Rept for Aug 1998 for Waterford,Unit 3. with ML20237B6831998-08-17017 August 1998 LER 98-S01-00:on 980723,discovered That Waterford 3 Physical Security Plan,Safeguards Document Was Not Under Positive Control of Authorized Person at All Times.Caused by Human Error/Inappropriate Action.Counseled Employee Involved ML20237C5661998-08-17017 August 1998 Safety Evaluation Accepting Licensee Request for Exemption from Section Iii.O of Appendix R to 10CFR50 ML18066A2771998-08-13013 August 1998 Part 21 Rept Re Deficiency in CE Current Screening Methodology for Determining Limiting Fuel Assembly for Detailed PWR thermal-hydraulic Sa.Evaluations Were Performed for Affected Plants to Determine Effect of Deficiency ML20237B5261998-07-31031 July 1998 Monthly Operating Rept for July 1998 for Waterford 3 ML20236S9031998-07-22022 July 1998 SER Accepting Rev 19 to Quality Assurance Program for Waterford Steam Electric Station,Unit 3 ML20198H3911998-07-14014 July 1998 Non-proprietary Rev 5 to HI-961586, Thermal-Hydraulic Analysis of Waterford-3 Spent Fuel Pool ML20236N4181998-06-30030 June 1998 Monthly Operating Rept for June 1998 for Waterford,Unit 3 ML20248E7781998-06-0101 June 1998 Annual Rept on Abb CE ECCS Performance Evaluation Models ML20249A4711998-05-31031 May 1998 Monthly Operating Rept for May 1998 for Waterford 3 Ses ML20196A4051998-05-31031 May 1998 Rept of Facility Changes,Tests & Experiments,Per 10CFR50.59 for 970601-980531. with ML20198H4681998-05-20020 May 1998 Non-proprietary Rev 1 to HI-981942, Independent Review of Waterford Unit 3 Spent Fuel Pool Cfd Model ML20247A3891998-05-0101 May 1998 SG Eddy Current Examination (8th Refueling Outage) ML20247F6761998-04-30030 April 1998 Monthly Operating Rept for Apr 1998 for Waterford,Unit 3.W/ ML20217M8951998-04-30030 April 1998 QA Program Manual ML20217P8281998-04-0707 April 1998 Safety Evaluation Accepting Relief Authorization for Alternative to Requirements of ASME Section Xi,Subarticle IWA-5250 Bolting Exam for Plants,Per 10CFR50.55a(a)(3)(i) ML20216B1751998-03-31031 March 1998 Monthly Operating Rept for Mar 1998 for Waterford 3 Ses ML20217M1411998-03-0303 March 1998 Rev 2 of Waterford 3 Cycle 9 Colr 1999-09-30
[Table view] |
Text
!
i Ref: 10CFR50.73(a)(2)(iv)
P ,
l- Lo u i &s LIGHT POWER s a m a ! WATERFORD 3 SES
muts !
i W3A90-0145 A4.05 QA May 7,1990 U.S. Nuclear Regulatory Commission ATTENTION: Document Control Desk ,
I Washington, D.C. 20555
Subject:
Waterford 3 SES l Docket No. 50-382 License No. NPF-35 Reporting of Lice see Event Report l
Gentlemen Attached is Licensee Event Report Number LER-90-004-00 for Waterford .
Steam Electric Station Unit 3. This Licensee Event Report is submitted pursuant to 10CFR50.73(a)(2)(iv). -
Very truly yours,
'J.R. McGaha Plant Manager - Nuclear JRM/KTW/rk (w/ Attachment) cci Messrs. R.D. Martin J.T. Wheolock - INPO Records Center E.L. Blake W.M. Stevenson ,
D.L. Wigginton NRC Resident Inspectors Office 9005090344 900507 6DR ADOCK 05000382 l' s PDC q ZO "AN EQUAL OPPORTUNITY ER*LOYER" /
. . -, l _ . t em... m_ _
.,..,C,,...
. o enavtDoMeNo simonit LICENSEE EVENT REPORT (LER) ' " Na t $ ' "
I
- I AcaLITV esAMt (H (MsCatt NUMalm tal 8 AG E d' Waterford Steam Elcetric Station _ Unit 3 0 lb 101010131812 1 l0Fl 014 14 T L t tel Inadvertent Emergency Feedwater System Actuation Due to Test Circuit Malfunction
__ SVGNT DATI 196 L t h IWOMBE R ($1 mt PDAT DATI (F1 OTHE M $ AOttlTit $ ,NVOLYt D Its MONTH DAV YE A81 YEAH 'IU$'Mn du
" ,* ','$ MDPJf 6e DAV tlAA **"'L'Yv N*Wi$ D0l ki ' NVV8t h'8' N/A 016l0l0l0l l l
~ ~
0h 0l8 9 0 9l 0 0l0l4 0l0 0l5 0 l7 9l0 N/A 016l0g0l0l l l
,,,,,,,,,, tuis nicoat is eu MittiD ruasuANv vo tut at ovinm(Nr o, io C. s ic,.. ,, ,,,,,. ., ,, w .,, o n "UDI # 20 4o2th) ac eoStal I to 736eittual 7 7i4bl
]
po In to ammno so n im so n. urn.i n tu.i E*P 110 h re sosannia p osi.nsi so n.nsus otusa m m,,v - AA+ e so aamu.in
~
p n.unno
~~~
no n .nsn.. nAi - UI, '" " '" ' * ' '~'
to aainni.i en n . nan.n .o n.nznn. nei to a nin.i se n. nan o non.nsn..
LICINtit CONT ACT FOn Th.) Lim tint NAVE 15 LLPHONE Nuv9t R AkiACDDL T.ll. Smith, Plant Engineering Superintendent 51014 41614 l -1311 1218 COMettit DNt LINI #0h I ACH COMPONINT f Altunt DttCnistD IN TMit RIPOnf 113.
CiU$t tv57tv C p',"g "I CouPONI NT g " I,'g Caust tv5f f v C0vtONINT "")['g ,"U p',"h '
1 I I i i i 1 i i i i 1 I l I l l l l ! I l ! l l l l SUPPLIME NT AL htPORT t kPICit D Het UDN1h Dev v t A81 Sv D M 'f*5 tC N
} u <<< ,.. ,, ,, a uscrio ave.nssio= oA rts -]No o li yl4 9; 3 as s i e A C t n .-, o, . w .. . . . ,... - ,, ,.. ,y. u-, ,,,. ~n. ,...e n .>
At 0444 hours0.00514 days <br />0.123 hours <br />7.34127e-4 weeks <br />1.68942e-4 months <br /> on April 8, 1990, Waterford Steam Electric Station Unit 3 was operating at 100% power when a partial actuation of the Emergency Feedwater '
i (EFW) system occurred during a scheduled functional test of the Plant Protection System (PPS). This event is reportable an an unplanned Engineered Safety Feature (ESP) actuation. The actuation was not of sufficient duration to allow ErW flow to the Steam Generators (SG).
The root cause of this event is test circuit malfunction. Inspection of the matrix test module relay hold pushbutton contact blocks and wiring revealed a higher than normal resistance across the early opening contacts. The relay hold pushbutton assembly has been replaced and the PPS functional test has been l completed satisfactorily. Further diagnostic testing of the relay hold !
pushbutton is planned to attempt to isolate the cause of the circuit malfunction.
11ecause the circuit malfunction was associated only with the test circuitry and i the EFW System was capabic of responding in the safe direction, this event did I not threaten the health and safety of the general public or plant personnel, i
+
,e, ,, . n.
a
o
ac ee,. A v exucumtivefony coMMissio
, , LICENSEE EVENT REPORT (LER) TEXT CCNTINUATCN ue:.ovfo cus no mo-oio.
E xPIRES. S!$1/08 f #*1417 y NAMt (l) DOCKtifdVM$tM(U tlR NUMSIR (si . PA06 (31 ygan f l uvt NT ea k ef v stoN Waterford Steam -
Electric Station Unit 3 0 l5 l 0 l 0 l 0 l 3l8 l2 9 10 0l 0l 4 -
O l0 012 OF gl4 iEKT IN newe spece h reess eel arse enMaanelMC Form anWeb (1h At 0444 hours0.00514 days <br />0.123 hours <br />7.34127e-4 weeks <br />1.68942e-4 months <br /> on April 8, 1990, Waterford Steam Electric Station Unit 3 was operating at 100% power when a partial actuation of the Emergency Feedwater (EFW) (EIIS Identifier - DA) occurred during a scheduled functional test of the Plant Protection System (PPS) (EIIS Identifier - JC). This event is reportable as an unplanned engineered safety feature (ESP) actuation.
While performing step 85 of operating procedure (0p) 903-107, " Plant Protection System Channel Functional Test," which involves pressing and-holding the PPS matrix relay hold pushbutton and verifying system response, all three EFW pumps (EIIS Identifier BA-P) and Steam Generator (SG) (EIIS Identifier-SG) Blowdown System Isolation Valves (EIIS Identifier WI-ISV) actuated. The EFW to SG isolation valves did not open due to the short dura: ion of the actuation signal.
The functional test was terminated and EFW system components were returned to their normal configuration. The inadvertent actuation could not be reproduced and the functional test was later reperformed with satisfactory results.
l l The matrix relay hold pushbutton performs three functions. 1) It interrupts test power to the matrix test modules (EIIS Identifier - IMOD) not being tested. 2) It provides test power to the matrix relay bistable coils (EIIS Identifier - RIN/CL) through the use of early closure contacts
. (EIIS Identifier - CNTR) on the pushbutton. 3) It provides test power to the 1
matrix bistable relay opposing coils.
During the circuit test sequence. the relay hold pushbutton is depressed and l
I through use of the early closure contacts, applies test power to the aiding 1'
coils of the matrix trip path relays before the bistable relays are l
l deenergized. If the bistabic relays deerergize the matrix trip path relay primary coils before the matrix relay aiding coils energize, an Emergency Feedwater Actuation Signal (EFAS) (EIIS Identifier BA-JE) will result.
N3 C FQ9tU 396A 'U'I' ' "*
c-sa j
etRC Form 306A U $ NUC48 A3 ME;UL'.TOmv COMM606 l , , LICENSEE EVENT REPORT (LER) TEXT CONTINUATION Aaenoveo out no mo-oios p exeints. sinte 8 ACILtTF hAMG til . DoceLif NUMeth tv Lth NUMeth 16) PAGE 01
- 5^a
" R't.W." OJ.O Waterford Steam Electric Station Unit 3 TEXT (# sure space 4 oversif, use esMepner 44C Fsym JNA N tth 0 l6 l0 l0 l013 l 8l 2 9l 0 -
0 l0l4 -
C10 ({ 3 0F 0l4 During troubleshooting performed on May 3, 1990, the relay hold pushbutton and contact blocks for the A-C matrix test module were examined and revealed a higher than normal resistance across the early opening contacts. (Resistance measured in the range of 1.9 to 28 chms, compared to a normal resistanco of 0.2 ohms). This increased resistance may have allowed the bistable relays to deenergized before the matrix relay aiding coils fully energized, causing the EFAS.
I Based on the results of this inspection, the relay hold pushbutton and contacts were repinced and the A-C matrix was tested satisfactorily. Further diagnostic testing of the removed pushbutton is planned to attempt to isolate the cause of the circuit malfunction and evaluate to what degree the observed increase in contact resistance could have delayed the energitation of the aiding coils.
The possibility of carbon or corrosion product buildup on the contacts will also be explored. Based on the results of the diagnostic testing, the relay hold pushbutton assembly may be sent to the vendor (Combustion Engineering, Inc.) for further analysis. Appropriate long term corrective action will be taken as a result of this testing. Consideration will also be given to examination of similar pushbutton assemblies to address any generic concerns that may arise from the collective test results. If critical definitive information results from these analyses, a supplement to this report will be issued. The above mentioned testing is expected to be completed prior to December 28, 1990.
The circuit malfunction was limited to the PPS test circuitry and would not have impaired the ability of the EFW system or any other related safety systems to respond to an actual demand on the PPS if required. The functional test in progress at the time of the EFAS was later completed satisfactorily. For these reasons, the health and safety of the general public was not jeopardized during this event, ux .u.s. cm me-su-m e m
<, cu eonw n a
(
l WRC esem Sata - U s. WuCLla2 ELOULAf omY COuulSeloN
~
4
. UCENSEE EVENT REPORT (LER) TEXT CONTINUATION arenovto owo uo aino-oios l txeints swas j eaciun ausni pocniiwuusta m un aman m eaos m )
Waterford Steam
...- == =.n i I
Electric Station Unit 3 0 l5 l0 l0 l0 l 3lg l2 glo OF glg ssxs wma,eme a w u ,m oc w snuw on d ol 4 ~~
olo 0l4 Similar Events None Plant Contact T.H. Smith, Plant Engineering Superintendent, 504/464-3128.
l l
l i s
l l
t P
r l
NAC eORM 356A eU.S. CFtw 1994 520*l0,r00070 C SJ)
- . . - . , , ,. . , .. , . _ . . . . - - ,