ML20077C685
ML20077C685 | |
Person / Time | |
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Site: | Catawba ![]() |
Issue date: | 05/15/1991 |
From: | Tuckman M DUKE POWER CO. |
To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
References | |
NUDOCS 9105230060 | |
Download: ML20077C685 (2) | |
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Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARML20216E5401999-09-0707 September 1999
[Table view]Special Rept:On 990826,discovered That Meteorological Sys Upper Wind Speed Cup Set Broken,Causing Upper Wind Channel to Be Inoperable.Cup Set Replaced & Channel Restored to Operable Status on 990826 ML20210R1051999-08-0606 August 1999 Special Rept:On 990628,cathodic Protection Sys Was Declared Inoperable After Sys Did Not Pass Acceptance Criteria of Bimonthly Surveillance.Work Request 98085802 Was Initiated & Connections on Well Anode Were Cleaned or Replaced ML20206P2081998-12-31031 December 1998 Special Rept:On 981218,inoperability of Meteorological Monitoring Instrumentation Channels,Was Observed.Caused by Data Logger Overloading Circuit.Replaced & Repaired Temp Signal Processor ML20198B1341998-12-14014 December 1998 Revised Special Rept:On 980505,discovered That Certain Fire Barriers Appeared to Be Degraded.Caused by Removal of Firestop Damming Boards.Hourly Fire Watches Established in Affected Areas ML20196D4041998-11-19019 November 1998 Rev 1 to Special Rept:On 980618,determined That Method Used to Calibrate Wind Speed Instrumentation Loops of Meteorological Monitoring Instrumentation Sys Does Not Meet TS Definition for Channel Calibration.Procedure Revised ML20153B0531998-09-16016 September 1998 Special Rept:On 980817,errors in Implementation of Selected Licensee Commitment Testing Requirements on Fire Protection Sys Instruments,Was Discovered.Caused by Error in Interpretation of SLC Requirement.Will Revise Procedures ML20236M9151998-07-0707 July 1998 Special Rept:On 980611,determined That Required Firewatch Patrol Had Been Missed.Caused by Firewatch Being Performed on Wrong Unit Due to Human Error.Employee Was Verbally Counseled on Firewatches & Documentation Was Corrected ML20236G4451998-07-0101 July 1998 Special Rept:On 980618,declared Wind Speed Instrumentation Loops of Meteorological Monitoring Instrumentation Sys Inoperable.Caused by Failure to Meet TS Definition of Channel Calibr.Will Revise Selected Licensee Commitment ML20248K1431998-06-0202 June 1998 Special Rept:On 980505,discovered That Certain Fire Barriers Appeared to Be Degraded.Caused by Shrinkage of Foam & Improper Installation During Construction of Plant.Posted Fire Watches & Repaired Firestop F-AX-348-W-134 ML20247H5351998-04-12012 April 1998 Special Rept:On 980415,missed Insp of Fire Hose Caskets Was Discovered.Caused by Error in Transferring Info from One Procedure to Another.Planned Rev of Applicable Procedure to Include Gasket Insp at Appropriate Frequency ML20216B0211998-04-0606 April 1998 Special Rept:On 980325,determined That Loose Parts Monitoring Sys Being Inoperable for Greater than Thirty Days.Caused by Incorrect Testing.All Channels of Loose Parts Monitoring Sys Tested Utilizing Revised Test Method ML20217K9271998-03-26026 March 1998 Special Rept:On 971229,procedure Step for Closing Safety Injection Pump Cold Leg Injection Isolation Valve Was Inadvertently Skipped.Caused by Injection of Water Into RCS from Rwst.Simplified Procedures & Discussed Event ML20216D5641998-03-0505 March 1998 Special Rept:On 980204,discovered That Fire Detection Panel Was Apparently Not Communicating W/Several Local Fire Detectors.Caused by Faulty Computer Sys Cards.Replaced Four Computer Cards in Sys ML20202C4701998-02-0505 February 1998 Ro:On 971228:Unit 1 Loose Parts Monitoring Sys Channel 6 Was Declared Inoperable Due to Excessive Static on Channel. Caused by Loose Connection.Work Order Has Been Written to Pursue Repairs ML20138E6851997-04-24024 April 1997 Special Rept:On 970318,Unit 1 Loose Parts Monitoring Sys Channel 13 Was Declared Inoperable Due to Sporadic Electical Static.Channel Was Removed from Svc & Entered Into TS Action Item Logbook as Inoperable ML20149M7251997-01-20020 January 1997 Special Rept:On 961209,Unit 1 Loose Parts Monitoring (Lpm) Sys Channel 20 Declared Inoperable Due to No Signal Being Received from Field.Lpm Channel 20 & 22 Operable & Providing Monitoring Coverage for Primary Side of 1D S/G ML20134K4901996-11-0606 November 1996 Special Rept:On 961009,selective Licensee Commitment for Operability of Fire Protection Sprinkler Sys Not Maintained. Continuous Fire Watch Established within One H Following Identification of Incorrect Remedial Action ML20134H1331996-11-0404 November 1996 Special Rept:On 961004,Unit 1B DG Failed Due to Failure of Motor Operated Pot,Electronic & Mechanical Governor,Governor Droop Relay & Mechanical Binding of Fuel Rack Control Linkage.Dg Procedures Will Be Revised ML20113A1801996-06-17017 June 1996 Special Rept:On 960521,declared Detectors A01 for Zone 69 & A04 for Zone 60 Inoperable Because Detectors Effectively Isolated from Area in Intended Protection.Detectors Relocated,Tested & Declared Operable on 960524 ML20100H9801996-02-20020 February 1996 Special Rept:On 960111,Unit 1 Loose Parts Monitoring Channel 21 Declared Inoperable,Due to Spurious,Unexplainable Electronic Bursts.Work Request Initiated to Pursue Corrective Action ML20100H9751996-02-20020 February 1996 Special Rept:On 960111,Unit 2 Loose Parts Monitoring Sys Channel 7 Declared Inoperable,Due to pre-amp Bias Voltage Indicating Zero Volts Twice During Previous Seven Days.Work Request Written to Pursue Corrective Action ML20097F5011996-02-11011 February 1996 Special Rept:On 960102,Unit 2 Loose Parts Monitoring Sys Channel 17 Was Declared Inoperable.Two Other Channels Operable & Providing Coverage Against Loose Parts ML20096E7731996-01-12012 January 1996 Special Rept:On 951214,unit 2 DG Valid Failure Occurred. 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Corrective Maint Will Be Performed During 1EOC9 Outage ML20086C6441995-06-29029 June 1995 Special Rept:On 950523,Unit 1 Train a Fuel Handling Ventilation Filter Heaters Declared Inoperable.Evaluation Done to Determine Fault ML20085M4061995-06-20020 June 1995 Special Rept:On 950501,lower Rv Tube 4 Was Declared Inoperable ML20084N7271995-05-25025 May 1995 Special Rept:On 950425,valid Failure of DG 1A Occurred. Caused by Jacket Water Thermostatic Control Valve Sticking in Position Which Reduced Engine Cw Flow Through Heat Exchanger.Thermostatic Cv Internals Removed & Replaced ML20082L2711995-04-17017 April 1995 Special Rept:On 950308,Unit 2 Cathodic Protection Sys Was Declared Inoperable & Remained Inoperable Greater than 10 Days ML20081D4851995-03-13013 March 1995 Special Rept:On 950211,actuation of PORV 1NC32B Occurred. 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ML18016A9011999-04-12012 April 1999 Part 21 Rept Re Defect in Component of DSRV-16-4,Enterprise DG Sys.Caused by Potential Problem with Connecting Rod Assemblies Built Since 1986,that Have Been Converted to Use Prestressed Fasteners.Affected Rods Should Be Inspected ML20205N3651999-04-12012 April 1999 Safety Evaluation Accepting IPE of External Events Submittal ML20205N2381999-04-0909 April 1999 Safety Evaluation Supporting Amends 178 & 170 to Licenses NPF-35 & NPF-52,respectively ML20205N2121999-04-0808 April 1999 Safety Evaluation Supporting Amends 177 & 169 to Licenses NPF-35 & NPF-52,respectively ML20206R1931999-03-31031 March 1999 Revised Monthly Operating Repts for Apr 1999 for Catawba Nuclear Station,Units 1 & 2 ML20205P9521999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for Catawba Nuclear Station,Units 1 & 2 ML20205B3101999-03-26026 March 1999 Safety Evaluation Supporting Amends 176 & 168 to Licenses NPF-35 & NPF-52,respectively 1999-09-07 |
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DUKE POWER May 15,1991 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
Subject:
Catawba Nuclear Station, Unit 2 Docket No. 50-414 Special Report Invalid Failure of Diesel Generator 2B Pursuant to Technical Specification 4.8.1.1.3 and 6.9.2, find attached a Special Report concerning the Unit 2 Diesel Generator B (D/G 2B) invalid failure that occurred on April 15, 1991.
Very truly yours, b 3 k
M. S. Tuckman CRUDG2B5159 Attachment xc:
S. D. Ebneter Regional Administrator, Region II R. E. Martin, ONRR W. T. Orders Senior Resident Inspector hbp 2ggggg jg@yQ14
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.. t SPECIAL REPORT CATAWBA NUCLEAR STATION DIESEI, GENERATOR 2B INVALID FAILURE DURING OPERABILITY TESTING OF ENGINE An invalid failure (Start #631) of Diesel Generator (D/G) 2B occurred on April 15, 1991.
The failure occurred while closing D/G breaker 2ETB 18 when synchronizing to the eneigized bus during the monthly operability performance test, Irr/2/A/4350/02B. There have been zero valid failures in the past 20 valid starts and three valid failures in the past 100 valid starts for D/G 2B, The test surveillance interval is once per thirty-one days for both D/G's which is in compliance with Technical Specification 4.8.1.1.2 Table 4.8-1.
The opc ator was in the process of becc, ming qualified on Diesel Generators and was performing this test as part of the increased emphasis being placed on the potential for reverse power relay actuations. PT/2/A/4350/02B instructs the operator to load the D/G to greater than or equal to 5600 kW but less than or equal to 5750 kW. This is done by increasing load while adjusting voltage to maintain approximately a 0.98 lagging power factor. The D/G was loaded to greater than 5750 kW with a lagging power factor of approximately 0.60. A reverse power trip was received when the load was reduced to within the 5600 kW to 5750 kw range. The trip occurred from the combination of reducing _ load along with the lagging power factor condition. This start attempt was classified as an invalid failure per Regulatory Guide 1.108, since the trip was due to operator error. Special Reports were submitted to the NRC for similar situations on both D/G's which occurred during 1990 and in January 1991.
In an effort to reduce the potential for this type of invalid failure, new operators are required to perform the paralleling and loading operation as part of their training requirements.
The D/G was available during this period since the reverse power relay trip and associated synchronizing circuitry are bypassed on an emergency start.
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