ML20095H878
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| ML20095H878 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 12/18/1995 |
| From: | Ray D COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9512260210 | |
| Download: ML20095H878 (1) | |
Similar Documents at LaSalle | |
|---|---|
Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARML20237E2921998-08-21021 August 1998
[Table view]Special Rept:On 980811,channel 5 of Lpms Became Inoperable. Caused by Channel Failed pre-amplifier Located Inside Primary Containment at Inboard Side of Electrical Penetration E-19.Initiated Repairs of Channel ML20236P8231998-07-14014 July 1998 Special Rept:From 980614-17,various Fire Rated Assemblies Were Inoperable for Period Greater than Seven Days.Caused by Test Equipment Being Routed Through Fire Doors.Established Fire Watches & on 980619 Assemblies Were Declared Operable ML20249C4891998-06-22022 June 1998 Special Rept:On 980522,Fire Detection Zone 1-31 Was Noted out-of-service for More than 14 Days.Detection Sys Was Taken out-of-service on 980508 to Prevent False Alarms During Hot Work Activities.Sys Was Returned to Operable Status 980528 ML20217N6581998-03-30030 March 1998 Special Rept on Fire Detection,Deluge Sys & Fire Rated Assemblies During Period of 980303-25.Established Fire Watches Until Affected Equipment Is Returned to Operable Status ML20203D7241998-02-20020 February 1998 Special Rept:On 980118,Fire Detection Zones 1-18 & 2-18 Taken out-of-svc to Prevent False Alarms During Hot Work Activities on Auxiliary Electric Equipment Room Ventilation Sys.Fire Watches Will Remain in Place ML20198S1481998-01-21021 January 1998 Special Rept:On 971222-980120,fire Detection Zones 1-16, 1-16P,1-22P,1-31,2-36 & 2-37 Had Been OOS for Period Greater than 14 Days.Zones Were Taken OOS to Prevent False Alarms During Hot Work Activities.Established Fire Patrols ML20197A5781997-12-15015 December 1997 Special Rept:On 971117-1214,fire Doors 224,249,266,421 & 443 Inoperable for Period Greater That Seven Days.Doors Opened to Allow Passage of Cables to Support Rwca Mods,Cr & Auxiliary Electric Equipment Room Ventilation Sys Mods ML20199H5481997-11-21021 November 1997 Special Rept:On 971008,fires Detection Zones 1-30,1-32,2-30 & 2-32 Taken out-of-service to Prevent False Alarms During Work Activities.Affected Detection Zones Located at Elevations 673 & 694 in Units 1 & 2 Reactor Bldgs ML20217A5511997-09-12012 September 1997 Special Rept:On 970822-24,fire Detection Zones 1(2)-30, 1(2)-31,1(2)-32,1(2)-33 & 1-28 Were Taken OOS to Prevent False Alarms During Hot Work Activities in Affected Areas. Fire Detection Zones Were Restored ML20210K9011997-08-15015 August 1997 Special Rept:On 970701,declared Seismic Monitor Inoperable. Caused by Decision That Procedural Info Re Seismic Monitor Was Insufficient to Confidently Call Seismic Monitoring Equipment Operable.Revised Required Operating Procedures ML20138C6551997-04-23023 April 1997 Special Rept:On 970319,fire Doors Blocked Open Due to Routing of Temporary Power Cables to Supply Power to Essential Plant Equipment.Established Hourly Fire Watches & Restored Doors to Operable Status by Removing Cables ML20135E1171997-02-27027 February 1997 Special Rept:On 970218,new Seismic Monitor Equipment Was Installed.Dimensional Incompatibilities Was Discovered Between Existing & New Equipment.New Seismic Monitor Will Be Installed,Tested & Placed in Svc by 970306 ML20138G7051996-12-13013 December 1996 Special Rept:On 961109 & 23,detection & Fire Detection Zone 1-31 Taken OOS to Support Welding,Cutting & Grinding Activities within Zone During Unit 1 Forced Outage.Fire Watch Patrol Established IAW Action Statement a ML20138G7331996-12-13013 December 1996 Special Rept:On 961103,detection Zone 1-26 Taken OOS to Perform Work on Fire Protection Inverter 1FP05E.Established Fire Watch Patrol IAW Statement a ML20135F1451996-12-0909 December 1996 Special Rept:On 961126,declared Diesel Driven Suppression Pumps Inoperable When Engineering Identified Maint Had Not Been Performed During Shutdown.Completed 24-month Maint Insp & Changed 24-month Maint Insp to Once Per 18 Months ML20135A0501996-11-26026 November 1996 Special Rept:On 961017,seismic Monitor Declared Inoperable Due to Ready Light on RSA-50 Not Being Able to Be Reset. New Seismic Monitor Will Be Installed Per Design Change Package,Tested & Placed in Svc by 970228 ML20134M4211996-11-15015 November 1996 Special Rept:On 961011,Fire Doors 849 & 260 Were Declared Inoperable.Doors Were Opened for Period Greater than 7 Days to Support Activities Performed During Unit 2 Refueling Outage.Fire Watch Was Established IAW Action Statement ML20134H0301996-11-0404 November 1996 Special Rept:On 961009,fire Detection Zones 2-16 & 2-16P Were Declared Inoperable.Fire Watch Once Per Eight H Has Been Established & Will Remain in Effect Until Detection Sys Is Restored ML20134E6391996-10-23023 October 1996 Special Rept:On 961001,roll-up Fire Door 615 Declared Inoperable.Door Was Opened for Period Greater than Seven Days.Hourly Fire Watch Established & Will Remain in Effect Until Door Closed ML20128N3961996-10-0404 October 1996 Special Rept:On 960918,fire Door 406 Was Declared Inoperable Because Door Was Open for Period Greater than Seven Days to Support Activities Performed During Unit 2 Refueling Outage. Hourly Fire Watch Has Been Established IAW Action Statemen ML20129G5341996-09-26026 September 1996 Special Rept:On 960820,leak at Vitalic Coupling Upstream of Isolation Valve for Sprinkler Sys Protecting Cable Areas Above Laboratories Was Discovered.Caused by Inadequate Seal. New Vitalic Coupling Installed ML20115A7501996-07-0303 July 1996 Special Rept:On 960624,both Diesel Fire Pumps Declared Inoperable.Caused by Injectable Sealant Matl Entering Service Water Sys.Performed Backwashing of Service Water Strainers ML20149K7791996-02-13013 February 1996 Special Rept:On 960205,fire Rated Barrier Inoperable for More than Seven Days.Caused by Removal of Fire Seal in Electrical Floor to Install Structural Steel to Support Panel 1PA07J.Fire Watch Formed.Barrier Restored 960207 ML20097D1691996-02-0505 February 1996 Special Rept:On 960113,fire Door 406 Declared Inoperable. Door Was Opened for Period Greater than Seven Days to Support Activities Performed During Unit 1 Refueling Outage. Hourly Fire Watch Established ML20096G5581996-01-19019 January 1996 Ro:On 951220,operator Unsuccessfully Attempted to Close Acb 2433,causing 2B DG to Shutdown.Caused by Bent Arm.Arm Positioned to Correct State ML20095H8781995-12-18018 December 1995 Special Rept:On 951120,2B DG Tripped on Loss of Excitation Due to Failure of R3 Potentiometer Associated W/Dg Voltage Regulator.Potentiometer Replaced & 2B DG Operated Successfully on 951122 ML20093K3491995-10-13013 October 1995 Special Rept:On 950921,Fire Door 615 Was Inoperable for Period Greater than Seven Days.Door Was Opened 950914 to Allow Access to Reactor Recirculation Sys Panel 2H13-P634. Established Hourly Fire Watch ML20093B0881995-10-0404 October 1995 Special Rept:On 950830,1B DG Tripped Due to Reverse Power. Caused by Improper Setting on Paralleling Circuit of 1B Voltage Regulator ML20086Q5801995-07-24024 July 1995 Special Rept:On 950705,2B DG Tripped on Loss of Excitation Due to Fluctuations of Var Loading on Grid ML20086D7761995-07-0707 July 1995 Special Rept:On 950607,Unit 1B DG Started for Monthly Operability Run & Approx 10 Seconds Later,Tripped Due to Operator Error.Equipment Operator-in-Training Counseled & Surveillance Performed Satisfactorily ML20086A3481995-06-0202 June 1995 Special Rept:On 950602,fire Door 300 Was Inoperable for Period Greater than Seven Days ML20084E2451995-05-26026 May 1995 Special Rept:On 950420,LPMS Channel Ten Was Declared Inoperable Due to Low Audio Signal.Cause Unknown.Defective Channel Will Not Be Repaired Until Next Forced or Scheduled Outage ML20082N3981995-04-21021 April 1995 Special Rept:On 950324,while Defueled,Unit 2 2B DG Was Operating in Accordance W/Plant Technical Surveillance LTS- 500-211, Unit 2 Division 3 ECCS Response Time Surveillance ML20082K2311995-04-13013 April 1995 Special Rept:On 950328,minimum Number of Required Operable Detectors for Fire Detectors for Fire Detection Zone 2-34 Had Not Been Maintained Causing to Exceed 14-day Timelock Allowed by TS ML20082K2691995-04-12012 April 1995 Special Rept:On 950327,minimum Number of Required Operable Detectors for Fire Detection Zone 2-32 Had Not Been Maintained,Causing to Exceed 14-day Timeclock Allowed by TS ML20082K2761995-04-12012 April 1995 Special Rept:On 950325,minimum Number of Required Operable Detectors for Fire Detection Zone 2-31 Had Not Been Maintained,Causing to Exceed 14-day Timeclock Allowed by TS ML20082C7481995-04-0303 April 1995 Special Rept:On 950312,fire Door 393 Inoperable for Period Greater than Seven Days to Support Chemical Decontamination of RHR & Reactor Recirculation Sys During Unit 2 Refueling Outage.Hourly Fire Watch Established ML20082C8341995-04-0303 April 1995 Special Rept:On 950307,fire Door 417 Inoperable for Period Greater than Seven Days to Support Chemical Decontamination of RHR Sys During Unit 2 Refueling Outage.Hourly Fire Watch Established & Door 417 Returned to Operable Status 950322 ML20082B5901995-03-31031 March 1995 Special Rept:On 950301,Unit 0 DG Tripped Due to Reverse Power.Unit 0 DG Trip May Have Been Caused by Voltage Fluctuation on Offsite Power Grid.Lasalle Operating Surveillance LOS-DG-SA1 Being Reviewed ML20082B5921995-03-31031 March 1995 Special Rept:On 950301,min Number of Required Operable Detectors for Fire Detection Zones 1-26 & 2-26 Had Not Been Maintained.Subj Fire Detection Zones Taken Out of Svc to Prevent Spurious Alarms & Fire Watch Established ML20087G3871995-03-29029 March 1995 Special Rept:On 950227,Fire Door 615 Inoperable for Period Greater than Seven Days to Support LaSalle Unit 2 Refueling Outage Maint & Surveillance Activities.Hourly Fire Watch Established ML20081B2171995-03-10010 March 1995 Special Rept:On 950220,fire Door 406 Was Inoperable for Period of More than 7 Days.Hourly Fire Watch Established & Will Remain in Effect Until End of Refueling Outage ML20080J7091995-02-17017 February 1995 Special Rept:On 950124,min Number of Required Operable Detectors for Zone 2-25 Had Not Been Maintained.Cause Due to Alarms Taken out-of-svc While Installation of Darmatt Fire Barriers.Fire Watch Established ML20078N0821995-02-0909 February 1995 Special Rept:On 950126,units 1 & 2 License Condition for Implementation & Maintenance of FP Program Was Not Met. Caused by Programmatic Deficiency in Surveillance Scheduling Process.Repairs to Lighting & Review of Program ML20078G8891995-01-26026 January 1995 Special Rept:On 950104, O DG Tripped.Caused by Procedure Deficiency.Lube Oil Line Vented & O DG Successfully Operated,Per LOS-DG-M1, O DG Operability Test & Returned to Svc ML20080F7141995-01-19019 January 1995 Special Rept:On 941221,2B DG Was Shutdown for Investigation by Sys Engineering & Electrical Maint Personnel Due to Speed Engine Governor Reacting Opposite of Given Signal ML20064M6171994-03-0707 March 1994 Special Rept:On 931209,drywell Suppression Chamber Floor Bypass Test Performed,Per TS LTS-300-10,following Primary Containment Integrated Leak Rate Test.Drywell Bypass Test Performed Satisfactorily as Results Well within TS Limit ML20058N5341993-10-0707 October 1993 Special Rept:On 930916,Fire Detection Zones 1-26 & 2-26 Exceeded 14 Day Time Clock Because Detectors Taken Out of Svc to Prevent Spurious Alarms Caused by Work Activities. Hourly Fire Watch Established ML20057B3651993-09-10010 September 1993 Special Rept:On 930815,DG 1B Room Carbon Dioxide Sys Installed in Fire Hazard Zone 7B1 Exceeded 14 Day Timeclock Because Sys Taken Out of Svc to Support Maint Work.Fire Watch Established,Problem Corrected & Sys Returned to Svc ML20056H0191993-09-0101 September 1993 Special Rept:On 930806,Fire Detection Zone 1-26,located in Fire Area 1 Exceeded 14 Day Time Clock Because Detectors Taken Out of Svc Due to Spurious Alarming.Sys Declared Operable on 930830 1998-08-21 Category:TEXT-SAFETY REPORT MONTHYEARML20217C9121999-10-12012 October 1999
[Table view]SER Input Authorizing Licensee Proposed Request to Modify Definition of Core Alteration in Section 1.0 of TS & Update Sections 3/4.1,3.4.3 & 3/4.9 to Reflect Proposed Definition Change ML20217F9091999-09-30030 September 1999 Monthly Operating Repts for Sept 1999 for LaSalle County Stations,Units 1 & 2.With ML20217A1691999-09-22022 September 1999 Part 21 Rept Re Engine Sys,Inc Controllers,Manufactured Between Dec 1997 & May 1999,that May Have Questionable Soldering Workmanship.Caused by Inadequate Personnel Training.Sent Rept to All Nuclear Customers ML20212C4501999-08-31031 August 1999 Monthly Operating Repts for Aug 1999 for LaSalle County Station,Units 1 & 2.With ML20210R0671999-07-31031 July 1999 Monthly Operating Repts for July 1999 for LaSalle County Station,Units 1 & 2.With ML20210C1681999-07-0909 July 1999 Seventh Refueling Outage ASME Section XI Summary Rept ML20209H1501999-06-30030 June 1999 Monthly Operating Repts for June 1999 for LaSalle County Station,Units 1 & 2.With ML20195J7871999-05-31031 May 1999 Monthly Operating Repts for May 1999 for LaSalle County Station,Units 1 & 2.With ML20209E1431999-05-31031 May 1999 Cycle 8 COLR, for May 1999 ML20195B2591999-05-19019 May 1999 Rev 66a to CE-1-A,consisting of Proposed Changes to QAP for Dnps,Qcs,Znps,Lcs,Byron & Braidwood Stations ML20206N2071999-04-30030 April 1999 Monthly Operating Repts for Apr 1999 for LaSalle County Station,Units 1 & 2.With ML20205L8421999-03-31031 March 1999 Rev 2 to EMF-96-125, LaSalle Unit 2 Cycle 8 Reload Analysis ML20205L8301999-03-31031 March 1999 Administrative Technical Requirements App B (Amend 26) LaSalle Unit 2 Cycle 8 COLR & Reload Transient Analysis Results, for Mar 1999 ML20205R2721999-03-31031 March 1999 Monthly Operating Repts for Mar 1999 for LaSalle County Station,Units 1 & 2.With ML20205L8391999-03-22022 March 1999 Rev 2 to 960103, Neutronics Licensing Rept for LaSalle Unit 2,Cycle 8 ML20204C8141999-02-28028 February 1999 Monthly Operating Repts for Feb 1999 for LaSalle County Station,Units 1 & 2.With ML20199E4601998-12-31031 December 1998 Monthly Operating Repts for Dec 1998 for LaSalle County Station,Units 1 & 2.With ML20207C7371998-12-31031 December 1998 Annual Rept for LaSalle County Station for Jan 1998 Through Dec 1998 ML20205M7061998-12-31031 December 1998 Unicom Corp 1998 Summary Annual Rept. with ML20198B3801998-12-14014 December 1998 SER Accepting one-time Request for Relief from Certain Provisions of Section XI of ASME Boiler & Pressure Vessel Code,Per 10CFR50.55a for Certain Plant Safety/Relief Valves ML20206N2261998-12-0909 December 1998 LER 98-S03-00:on 981116,protected Area Was Entered Without Current Authorization for Unescorted Access Due to Programmatic Deficiency Error.Changed Badge Control Process ML20197K0981998-11-30030 November 1998 Monthly Operating Repts for Nov 1998 for LaSalle County Station,Unts 1 & 2.With ML20196B1441998-11-23023 November 1998 Safety Evaluation Accepting Licensee Response to GL 95-07, Pressure Locking & Thermal Bindings of Safety-Related Power-Operated Gate Valves ML20196A4191998-11-19019 November 1998 Safety Evaluation Accepting QA TR CE-1-A,Rev 66 Re Changes in Independent & Onsite Review Organization by Creating NSRB ML20195D3191998-10-31031 October 1998 Monthly Operating Repts for Oct 1998 for LaSalle County Station.With ML20154H6781998-09-30030 September 1998 Monthly Operating Repts for Sept 1998 for LaSalle County Nuclear Power Station,Units 1 & 2 ML20153D0191998-09-18018 September 1998 Part 21 Rept Re Defect in Gap Conductance Analyses for co- Resident BWR Fuel.Initially Reported on 980917.Corrective Analyses Performed Demonstrating That Current Operating Limits Bounding from BOC to Cycle Exposure of 8 Gwd/Mtu ML20153C7621998-09-18018 September 1998 Safety Evaluation Acceping NRC Bulletin 95-002, Unexpected Clogging of RHR Pump Strainer While Operating in Suppression Pool Cooling Mode ML20153C6771998-09-17017 September 1998 Part 21 Rept Re Defect Relative to MCPR Operating Limits as Impacted by Gap Conductance of co-resident BWR Fuel at Facilities.Operating Limit for LaSalle Unit 2 & Quad Cities Unit 2 Will Be Revised as Listed ML20151W0241998-08-31031 August 1998 Monthly Operating Repts for Aug 1998 for LaSalle County Station.With ML20237E2921998-08-21021 August 1998 Special Rept:On 980811,channel 5 of Lpms Became Inoperable. Caused by Channel Failed pre-amplifier Located Inside Primary Containment at Inboard Side of Electrical Penetration E-19.Initiated Repairs of Channel ML20237E2331998-08-21021 August 1998 Revised Pages of Section 20 of Rev 66 to CE-1-A, QA Topical Rept ML20237B4861998-07-31031 July 1998 Monthly Operating Repts for July 1998 for LaSalle County Nuclear Power Station Units 1 & 2 ML20236V7701998-07-31031 July 1998 Revised LaSalle Unit 1 Cycle 8 COLR & Reload Transient Analysis Results ML20236P8231998-07-14014 July 1998 Special Rept:From 980614-17,various Fire Rated Assemblies Were Inoperable for Period Greater than Seven Days.Caused by Test Equipment Being Routed Through Fire Doors.Established Fire Watches & on 980619 Assemblies Were Declared Operable ML20236N6751998-07-0909 July 1998 Part 21 & Deficiency Rept Re Notification of Potential Safety Hazard from Breakage of Cast Iron Suction Heads in Apkd Type Pumps.Caused by Migration of Suction Head Journal Sleeve Along Lower End of Pump Shaft.Will Inspect Pumps ML20236L8041998-07-0606 July 1998 Safety Evaluation Granting Licensee 980304 Request for Second 10-yr Interval Pump & Valve IST Program Plan,Rev 2, Including Changes to 2 ASME Boiler & Pressure Vessel Code Relief Requests Previously Submitted in Rev 1 ML20236P3611998-06-30030 June 1998 Monthly Operating Repts for June 1998 for LaSalle County Nuclear Power Station,Units 1 & 2 ML20249C4891998-06-22022 June 1998 Special Rept:On 980522,Fire Detection Zone 1-31 Was Noted out-of-service for More than 14 Days.Detection Sys Was Taken out-of-service on 980508 to Prevent False Alarms During Hot Work Activities.Sys Was Returned to Operable Status 980528 ML20248M3101998-05-31031 May 1998 Monthly Operating Repts for May 1998 for LaSalle County Nuclear Power Station,Units 1 & 2 ML20236V7771998-05-31031 May 1998 Rev 1 to 24A5180, Supplemental Reload Licensing Rept for LaSalle County Station Unit 1 Reload 7 Cycle 8 ML20217Q7041998-05-0404 May 1998 Safety Evaluation Accepting Util Request to Leave Leak Chase Channels Plugged During Performance of Containment ILRT ML20247M4491998-04-30030 April 1998 Monthly Operating Repts for Apr 1998 for LaSalle County Station ML20216F4941998-03-31031 March 1998 Monthly Operating Repts for Mar 1998 for LaSalle County Station,Units 1 & 2 ML20217N6581998-03-30030 March 1998 Special Rept on Fire Detection,Deluge Sys & Fire Rated Assemblies During Period of 980303-25.Established Fire Watches Until Affected Equipment Is Returned to Operable Status ML20216D9511998-02-28028 February 1998 Monthly Operating Repts for Feb 1998 for LaSalle County Station,Units 1 & 2 ML20247M4631998-02-28028 February 1998 Rev Monthly Operating Rept for Feb 1998 for LaSalle County Station ML20203D7241998-02-20020 February 1998 Special Rept:On 980118,Fire Detection Zones 1-18 & 2-18 Taken out-of-svc to Prevent False Alarms During Hot Work Activities on Auxiliary Electric Equipment Room Ventilation Sys.Fire Watches Will Remain in Place ML20202G9851998-01-31031 January 1998 Monthly Operating Repts for Jan 1998 for LaSalle County Station,Units 1 & 2 ML20199K1651998-01-23023 January 1998 Rev 65h to Topical Rept CE-1-A, Comm Ed QA Tr 1999-09-30 |
Text
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Commonwealth Ediwn Company .
,4 laSalle Generating Station
, 2001 North 21st Road Star +eille*, IL 61311 -9757 Tel M1F3574,761 December 18,1995 United States Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Document Control Desk This special report is submitted in accordance with LaSalle Unit 2 Operating Licenses, Technical Specification 4.8.1.1.3 and 6.6.c regarding Unit 2 Diesel Generator (E22,2E22-S001).
On November 20,1995 with LaSalle Unit 2 at 100% power,the Unit 2 B (HPCS) Diesel Generator (DG) was being operated per LaSalle Operating Procedure LOS-DG-M3, "lB(2B) Diesel Generator Operability Test" After the engine was loaded to its full load, the Nuclear Station Operator (NSO) noticed large swings in the VAR loading of the engine. Before the operator could react to stabilize the VAR loading, the 2B DG tripped on Loss of Excitation. This failure was a valid failure in accordance with Regulatory Guide 1.108 and Technical Specification 4.8.1.1.3.
The cause of the 2B DG trip due to Loss of Excitation was the failure of the R3 potentiometer associated with the DG voltage regulator. System Operating Analysis Department (SOAD) and the DG System Engineer began troubleshooting the circuitry associated with the voltage regulator and found the resistance readings of the R3 potentiometer to be very erratic. The potentiometer was replaced and the 2B DG was operated successfully on November 22,1995.
If there are any questions or comments concerning this letter, please refer them to me at (815) 357-6761, extension 2212.
Res - ly, D.J. Ray Station Manager LaSalle County Station ec: H.J. Miller, Regional Administrator, Region III K.D. Ihnen, Acting Senior Resident Inspector, LaSalle l IDNS Resident inspector INPO - Records Center D. L. Farrar, Nuclear Regulatory Services Manager, NORS l Central file c r- j g
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