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Category:CORRESPONDENCE-LETTERS
MONTHYEARML17313B0991999-10-14014 October 1999 Forwards LER 99-005-00 Reporting Findings & Corrective Actions Taken as Result of Out of Tolerance MSSV Condition in Unit 1 Which Was Discovered During pre-outage Testing ML17313B0881999-10-12012 October 1999 Forwards Response to NRC 990831 RAI Re Several Relief Requests That Accompanied Second ten-yr Interval ISI Program Submitted on 980317.Revised Relief Request 6 Is Provided in Encl 2 ML17300B3501999-09-29029 September 1999 Forwards Revised Bases Pages,Providing Addl Discussion of Options Available to Exit Required Action G of TS 3.8.1 & Revised Page for TS 3.3.7,in Response to NRC RAI Re Proposed Amend to TS 3.8.1 & 3.3.7 ML17300B3551999-09-28028 September 1999 Responds to Aministrative Ltr 99-03, Preparation & Scheduling of Operator Licensing Exams. Proposed Palo Verde Operator Licensing Exam Schedule & Estimated Number of Applicants Planning to Take Exams Encl ML17313B0851999-09-24024 September 1999 Requests Approval of Alternative to Repair Requirements of 10CFR50.55a,authorizing Alternative Use of Mechanical Nozzle Seal Assemblies,As Described in Encl,For RCS Hot Leg Instrumentation & Sampling Nozzles for Two Operating Cycles ML17313B0781999-09-20020 September 1999 Forwards Rev 22 to PVNGS Emergency Plan. Summary Description of Changes,Included ML17300B3331999-09-14014 September 1999 Forwards MOR for August 1999 & Revised MOR for Jul 1999 for Pvngs,Units 1,2 & 3 ML17300B3351999-09-0808 September 1999 Informs That Repairs to Plant EDG 2A Jacket Water Cooling sub-sys Were Completed & EDG Was Declared Operable on 990903 at Approx 21:45 Mst.Noed Was Not Necessary,Since 72 Hour Completion Time Was Met ML17313B0761999-09-0303 September 1999 Requests Enforcement Discretion to TS Section 3.8.1, AC Sources - Operating. Enforcement Discretion Would Allow,On One Time Basis,Extension of Completion Time in Required Action B.4 of TS 3.8.2 from 72 H to 108 H ML17313B0731999-08-31031 August 1999 Informs That RR Bean (License OP-50452-1) Has Been Permanently Reassigned to Position That Does Not Require License & Requests That Individuals License Be Expired Per 10CFR55.55 ML20211A9501999-08-12012 August 1999 Discusses 990720-21 Workshop Conducted in Region IV Ofc,Re Exchange of Info in Area of Use of Risk Insights in Regulatory Activities.List of Attendees,Summary of Topic & Issues,Agenda & Copies of Handouts Encl ML17313B0581999-08-0606 August 1999 Forwards Rev 1 of Changes to TS Bases Implemented Between Aug 1998 & Jul 1999.Insertion Instructions & List of Affected Pages Included ML17313B0311999-08-0303 August 1999 Submits Response to NRC AL 99-02, Operating Reactor Licensing Actions Estimates, for Fys 2000 & 2001 ML20210L1461999-08-0303 August 1999 Informs That NRC Plans to Administer Gfes of Written Operator Licensing Exam on 991006.Requests Submittal of Ltr Identifying Individuals Taking Exam,Personnel Allowed Access to Exams & Mailing Address for Exams ML17313B0431999-07-30030 July 1999 Advises of Listed Senior Mgt Changes That Have Taken Place at Plant ML17313B0441999-07-30030 July 1999 Forwards Comments on Draft NRC Repts Evaluation of AOVs at Us Light-Water Reactors (1999) & Idaho Natl Engineering & Environ Lab Rept (INEEL)EXT-98-00383,Study of AOVs in Npps. ML17313B0151999-07-20020 July 1999 Submits Request to Obtain All Data Previously Sent by PVNGS & Currently in REIRS for OLs NPF-41,NPF-51 & NPF-74.Data Is Requested in Electronic Form (Ascii Format) as It Currently Exists in REIRS Sys ML17313B0091999-07-20020 July 1999 Forwards Requested Calculations Performed to Verify That Increase in Max Radially Averaged Enrichment for Fuel Assemblies from 4.3 Weight Percent to 4.8 Weight Percent Did Not Affect Requirements for TSs 3.7.15,3.7.17 & 4.3.1 ML17313B0171999-07-16016 July 1999 Forwards LER 99-005-00,re Automatic Rt Which Occurred on 990618,following Sensor Failure in Core Protection Calculators.Corrective Actions Described in LER Are Not Necessary to Maintain Compliance with Regulations ML17300B3111999-07-15015 July 1999 Forwards PVNGS Unit 2 ISI Rept for Eighth Refueling Outage. No Commitments Made to NRC by Ltr ML17300B3141999-07-15015 July 1999 Forwards Corrected Electronic Files for Individual Monitoring Repts for 1998.Original Electronic Files Were Found to Have Two Administrative Errors,Which Has Been Corrected.Encl Withheld,Per 10CFR2.790 ML20209G6771999-07-0808 July 1999 Forwards Supplemental Info to Confirm That Decommissioning Funding Plans of Public Service Co of Nm for Interests in PVNGS Have Been Reviewed by Nm Public Regulation Commission. Final Order & Recommended Decisions in Case 2742,also Encl ML17300B2931999-07-0202 July 1999 Submits Withdrawal of Relief 5 for Second ISI Interval for Units 1,2 & 3.Proposed Alternative Is Related to Exam Requirements for Component Supports for Second ISI Interval ML17313A9951999-06-26026 June 1999 Provides Response to NRC GL 98-01,Suppl 1, Y2K Readiness of Computer Sys at Nuclear Power Plants. ML17300B2831999-06-26026 June 1999 Requests NRC Approval of Proposed Alternative IAW Provisions of 10CFR50.55a(a)(3)(i) to 10CFR50.55a(g) & Requirements of ASME Boiler & Pressure Vessel Code Section XI for Repairs & Installation.Description of Proposed Alternative,Encl ML17313A9901999-06-15015 June 1999 Forwards Response to RAI Re GL 96-05, Periodic Verification of Design-Basis Capability of Safety-Related Movs. No Commitments Being Made to NRC by Ltr ML17313A9521999-05-24024 May 1999 Notifies NRC That Ja Proctor,License SOP-50314,has Been Permanently Reassigned to Position That Does Not Require License.License Should Be Expired,Per 10CFR55.55 ML20206Q3111999-05-18018 May 1999 Final Response to FOIA Request for Documents.Forwards App a Records Being Released in Entirety ML17313A9311999-05-13013 May 1999 Notifies NRC That Rev 2 to COLR for Unit 2 Remains Applicable Following Recently Completed Unit 2 Reload ML17313A9481999-05-12012 May 1999 Informs of Change Needed in Order to Update Current Mailing List.Future Mailings for J Horne Should Be Forwarded to Listed Address ML17313A9261999-05-0707 May 1999 Forwards LER 99-004-00,per 10CFR50.73.LER Repts Findings & Corrective Actions Taken as Result of Unit 2 Out of Tolerance Pressurizer Safety Valve (Psv) Condition Which Was Discovered During Outage Testing ML20206H1931999-05-0303 May 1999 Forwards 1998 Annual Rept, for SONGS Units 2 & 3 & PVNGS Units 1,2 & 3.SCEs Form 10K Annual Rept to Securites & Exchange Commission for Fiscal Yr Ending 981231,encl ML17313A9091999-04-30030 April 1999 Forwards Proprietary Proposed Test Outlines for Initial License Exams to Be Administered at PVNGS in Aug/Sept 1999. No Commitments Are Contained in Ltr.Proprietary Info Withheld ML17313A9181999-04-30030 April 1999 Forwards Electronic File of Individual Monitoring Repts for 1998.Encl Withheld Per 10CFR2.790 ML17313A9191999-04-30030 April 1999 Forwards Special Rept 2-SR-99-001 Re SG Tube Plugging in PVNGS Unit 2,per TS Reporting Requirement 5.6.8.Complete Results of SG Tube Inservice Insp Will Be Submitted by 000422 ML17300B3751999-04-23023 April 1999 Forwards LER 99-003-00,reporting Condition Prohibited by TS 3.7.17 Where Spent Fuel Assembly Was Stored in Inappropriate Region in Spent Fuel Pool ML17313A9081999-04-23023 April 1999 Documents 990421 Telcon with E Emeigh,Which Requested Extension for Submitting Next Matl Balance Rept for Pvngs,As Required by 10CFR70.53 & 74.13.Required Info Will Be Submitted by 990531 ML20205T7421999-04-21021 April 1999 Forwards Partially Withheld Insp Repts 50-528/99-05, 50-529/99-05 & 50-530/99-05 on 990322-26.Determined That Security Program Properly Implemented.Insp Repts Details Withheld (Ref 10CFR73.21) ML17313B0271999-04-21021 April 1999 Forwards Proprietary Epec Pro Forma Cashflow Statement for 1999.Proprietary Info Withheld,Per 10CFR2.790.Affidavit Encl ML17313A9031999-04-21021 April 1999 Forwards Rev to Relief Request 12 Submitted 990420 to Second 10-yr ISI Interval.Revised Relief Request Discusses in More Detail Actions APS Will Take When There Is Identified Leakage from Bolted Connection ML17313A8971999-04-20020 April 1999 Requests Use of Alternatives to 10CFR50.55a(g) Inservice Insp Requirements.Proposed Alternatives Are Related to Visual Exam of Bolted Connections 05000529/LER-1999-002, Forwards LER 99-002-00 Re Findings & Corrective Actions Taken as Result of Plant Out of Tolerance MSSV Condition Which Was Discovered During pre-outage Testing1999-04-19019 April 1999 Forwards LER 99-002-00 Re Findings & Corrective Actions Taken as Result of Plant Out of Tolerance MSSV Condition Which Was Discovered During pre-outage Testing ML17313A8931999-04-14014 April 1999 Forwards LER 99-003,reporting Condition Prohibited by TSs That Existed When Surveillance Requirement to Verify Essential Chilled Water Sys Valve Positions Was Not Met ML20205Q0821999-04-13013 April 1999 Forwards Second ISI Interval Relief Request 10 from ASME Section XI & Applicable Addenda Re Visual Exams Performed Subsequent to Repair or Replacement of Component or Alteration of Item ML17313A8901999-04-13013 April 1999 Forwards LER 98-003-01 Re MSSV as-found Lift Pressures out- Side of TS Limits.Ler Suppl Provides Evaluation Findings from Unit 3 out-of-tolerance MSSVs Conditions Which Were Discovered During pre-outage Testing ML17313A8831999-04-0808 April 1999 Forwards 1998 Annual Radioactive Effluent Release Rept for Pvngs,Units 1,2 & 3 & Rev 13 to ODCM, for Pvngs,Units 1,2 & 3 IAW TS 5.6.3 ML20205F3491999-03-30030 March 1999 Forwards Proprietary & non-proprietary Info Re Status of Decommissioning Funding for Pvngs,Units 1,2 & 3,per 10CFR50.75(f)(1).Proprietary Info Withheld,Per Requirements of 10CFR2.790(b)(1) ML17313A8671999-03-24024 March 1999 Submits Info Re Present Levels & Sources of Property Insurance Maintained for Pvngs,Per 10CFR50.54(w)(3) ML17313A8601999-03-16016 March 1999 Forwards Revised Relief Requests PRR-05,PRR-06 & PRR-11 to Clarify That Proposed Design Flow Testing for Lpsi,Hpsi & Containment Spray Pumps Will Be Performed Using Instruments That Comply with Code Requirements,Per 990226 Telcon ML17313A8551999-03-0505 March 1999 Requests Proposed Code Alternative IAW 10CFR50.55a(e)(3),as Acceptable Alternative to Requirements of 10CFR50.55a(e)(1), for Installation of in-line safety-related Flow Measurement Instrument in ASME Class 3 Pipe 1999-09-08
[Table view] Category:INCOMING CORRESPONDENCE
MONTHYEARML17313B0991999-10-14014 October 1999 Forwards LER 99-005-00 Reporting Findings & Corrective Actions Taken as Result of Out of Tolerance MSSV Condition in Unit 1 Which Was Discovered During pre-outage Testing ML17313B0881999-10-12012 October 1999 Forwards Response to NRC 990831 RAI Re Several Relief Requests That Accompanied Second ten-yr Interval ISI Program Submitted on 980317.Revised Relief Request 6 Is Provided in Encl 2 ML17300B3501999-09-29029 September 1999 Forwards Revised Bases Pages,Providing Addl Discussion of Options Available to Exit Required Action G of TS 3.8.1 & Revised Page for TS 3.3.7,in Response to NRC RAI Re Proposed Amend to TS 3.8.1 & 3.3.7 ML17300B3551999-09-28028 September 1999 Responds to Aministrative Ltr 99-03, Preparation & Scheduling of Operator Licensing Exams. Proposed Palo Verde Operator Licensing Exam Schedule & Estimated Number of Applicants Planning to Take Exams Encl ML17313B0851999-09-24024 September 1999 Requests Approval of Alternative to Repair Requirements of 10CFR50.55a,authorizing Alternative Use of Mechanical Nozzle Seal Assemblies,As Described in Encl,For RCS Hot Leg Instrumentation & Sampling Nozzles for Two Operating Cycles ML17313B0781999-09-20020 September 1999 Forwards Rev 22 to PVNGS Emergency Plan. Summary Description of Changes,Included ML17300B3331999-09-14014 September 1999 Forwards MOR for August 1999 & Revised MOR for Jul 1999 for Pvngs,Units 1,2 & 3 ML17300B3351999-09-0808 September 1999 Informs That Repairs to Plant EDG 2A Jacket Water Cooling sub-sys Were Completed & EDG Was Declared Operable on 990903 at Approx 21:45 Mst.Noed Was Not Necessary,Since 72 Hour Completion Time Was Met ML17313B0761999-09-0303 September 1999 Requests Enforcement Discretion to TS Section 3.8.1, AC Sources - Operating. Enforcement Discretion Would Allow,On One Time Basis,Extension of Completion Time in Required Action B.4 of TS 3.8.2 from 72 H to 108 H ML17313B0731999-08-31031 August 1999 Informs That RR Bean (License OP-50452-1) Has Been Permanently Reassigned to Position That Does Not Require License & Requests That Individuals License Be Expired Per 10CFR55.55 ML17313B0581999-08-0606 August 1999 Forwards Rev 1 of Changes to TS Bases Implemented Between Aug 1998 & Jul 1999.Insertion Instructions & List of Affected Pages Included ML17313B0311999-08-0303 August 1999 Submits Response to NRC AL 99-02, Operating Reactor Licensing Actions Estimates, for Fys 2000 & 2001 ML17313B0441999-07-30030 July 1999 Forwards Comments on Draft NRC Repts Evaluation of AOVs at Us Light-Water Reactors (1999) & Idaho Natl Engineering & Environ Lab Rept (INEEL)EXT-98-00383,Study of AOVs in Npps. ML17313B0431999-07-30030 July 1999 Advises of Listed Senior Mgt Changes That Have Taken Place at Plant ML17313B0151999-07-20020 July 1999 Submits Request to Obtain All Data Previously Sent by PVNGS & Currently in REIRS for OLs NPF-41,NPF-51 & NPF-74.Data Is Requested in Electronic Form (Ascii Format) as It Currently Exists in REIRS Sys ML17313B0091999-07-20020 July 1999 Forwards Requested Calculations Performed to Verify That Increase in Max Radially Averaged Enrichment for Fuel Assemblies from 4.3 Weight Percent to 4.8 Weight Percent Did Not Affect Requirements for TSs 3.7.15,3.7.17 & 4.3.1 ML17313B0171999-07-16016 July 1999 Forwards LER 99-005-00,re Automatic Rt Which Occurred on 990618,following Sensor Failure in Core Protection Calculators.Corrective Actions Described in LER Are Not Necessary to Maintain Compliance with Regulations ML17300B3111999-07-15015 July 1999 Forwards PVNGS Unit 2 ISI Rept for Eighth Refueling Outage. No Commitments Made to NRC by Ltr ML17300B3141999-07-15015 July 1999 Forwards Corrected Electronic Files for Individual Monitoring Repts for 1998.Original Electronic Files Were Found to Have Two Administrative Errors,Which Has Been Corrected.Encl Withheld,Per 10CFR2.790 ML20209G6771999-07-0808 July 1999 Forwards Supplemental Info to Confirm That Decommissioning Funding Plans of Public Service Co of Nm for Interests in PVNGS Have Been Reviewed by Nm Public Regulation Commission. Final Order & Recommended Decisions in Case 2742,also Encl ML17300B2931999-07-0202 July 1999 Submits Withdrawal of Relief 5 for Second ISI Interval for Units 1,2 & 3.Proposed Alternative Is Related to Exam Requirements for Component Supports for Second ISI Interval ML17313A9951999-06-26026 June 1999 Provides Response to NRC GL 98-01,Suppl 1, Y2K Readiness of Computer Sys at Nuclear Power Plants. ML17300B2831999-06-26026 June 1999 Requests NRC Approval of Proposed Alternative IAW Provisions of 10CFR50.55a(a)(3)(i) to 10CFR50.55a(g) & Requirements of ASME Boiler & Pressure Vessel Code Section XI for Repairs & Installation.Description of Proposed Alternative,Encl ML17313A9901999-06-15015 June 1999 Forwards Response to RAI Re GL 96-05, Periodic Verification of Design-Basis Capability of Safety-Related Movs. No Commitments Being Made to NRC by Ltr ML17313A9521999-05-24024 May 1999 Notifies NRC That Ja Proctor,License SOP-50314,has Been Permanently Reassigned to Position That Does Not Require License.License Should Be Expired,Per 10CFR55.55 ML17313A9311999-05-13013 May 1999 Notifies NRC That Rev 2 to COLR for Unit 2 Remains Applicable Following Recently Completed Unit 2 Reload ML17313A9481999-05-12012 May 1999 Informs of Change Needed in Order to Update Current Mailing List.Future Mailings for J Horne Should Be Forwarded to Listed Address ML17313A9261999-05-0707 May 1999 Forwards LER 99-004-00,per 10CFR50.73.LER Repts Findings & Corrective Actions Taken as Result of Unit 2 Out of Tolerance Pressurizer Safety Valve (Psv) Condition Which Was Discovered During Outage Testing ML20206H1931999-05-0303 May 1999 Forwards 1998 Annual Rept, for SONGS Units 2 & 3 & PVNGS Units 1,2 & 3.SCEs Form 10K Annual Rept to Securites & Exchange Commission for Fiscal Yr Ending 981231,encl ML17313A9191999-04-30030 April 1999 Forwards Special Rept 2-SR-99-001 Re SG Tube Plugging in PVNGS Unit 2,per TS Reporting Requirement 5.6.8.Complete Results of SG Tube Inservice Insp Will Be Submitted by 000422 ML17313A9181999-04-30030 April 1999 Forwards Electronic File of Individual Monitoring Repts for 1998.Encl Withheld Per 10CFR2.790 ML17313A9091999-04-30030 April 1999 Forwards Proprietary Proposed Test Outlines for Initial License Exams to Be Administered at PVNGS in Aug/Sept 1999. No Commitments Are Contained in Ltr.Proprietary Info Withheld ML17313A9081999-04-23023 April 1999 Documents 990421 Telcon with E Emeigh,Which Requested Extension for Submitting Next Matl Balance Rept for Pvngs,As Required by 10CFR70.53 & 74.13.Required Info Will Be Submitted by 990531 ML17300B3751999-04-23023 April 1999 Forwards LER 99-003-00,reporting Condition Prohibited by TS 3.7.17 Where Spent Fuel Assembly Was Stored in Inappropriate Region in Spent Fuel Pool ML17313B0271999-04-21021 April 1999 Forwards Proprietary Epec Pro Forma Cashflow Statement for 1999.Proprietary Info Withheld,Per 10CFR2.790.Affidavit Encl ML17313A9031999-04-21021 April 1999 Forwards Rev to Relief Request 12 Submitted 990420 to Second 10-yr ISI Interval.Revised Relief Request Discusses in More Detail Actions APS Will Take When There Is Identified Leakage from Bolted Connection ML17313A8971999-04-20020 April 1999 Requests Use of Alternatives to 10CFR50.55a(g) Inservice Insp Requirements.Proposed Alternatives Are Related to Visual Exam of Bolted Connections 05000529/LER-1999-002, Forwards LER 99-002-00 Re Findings & Corrective Actions Taken as Result of Plant Out of Tolerance MSSV Condition Which Was Discovered During pre-outage Testing1999-04-19019 April 1999 Forwards LER 99-002-00 Re Findings & Corrective Actions Taken as Result of Plant Out of Tolerance MSSV Condition Which Was Discovered During pre-outage Testing ML17313A8931999-04-14014 April 1999 Forwards LER 99-003,reporting Condition Prohibited by TSs That Existed When Surveillance Requirement to Verify Essential Chilled Water Sys Valve Positions Was Not Met ML20205Q0821999-04-13013 April 1999 Forwards Second ISI Interval Relief Request 10 from ASME Section XI & Applicable Addenda Re Visual Exams Performed Subsequent to Repair or Replacement of Component or Alteration of Item ML17313A8901999-04-13013 April 1999 Forwards LER 98-003-01 Re MSSV as-found Lift Pressures out- Side of TS Limits.Ler Suppl Provides Evaluation Findings from Unit 3 out-of-tolerance MSSVs Conditions Which Were Discovered During pre-outage Testing ML17313A8831999-04-0808 April 1999 Forwards 1998 Annual Radioactive Effluent Release Rept for Pvngs,Units 1,2 & 3 & Rev 13 to ODCM, for Pvngs,Units 1,2 & 3 IAW TS 5.6.3 ML20205F3491999-03-30030 March 1999 Forwards Proprietary & non-proprietary Info Re Status of Decommissioning Funding for Pvngs,Units 1,2 & 3,per 10CFR50.75(f)(1).Proprietary Info Withheld,Per Requirements of 10CFR2.790(b)(1) ML17313A8671999-03-24024 March 1999 Submits Info Re Present Levels & Sources of Property Insurance Maintained for Pvngs,Per 10CFR50.54(w)(3) ML17313A8601999-03-16016 March 1999 Forwards Revised Relief Requests PRR-05,PRR-06 & PRR-11 to Clarify That Proposed Design Flow Testing for Lpsi,Hpsi & Containment Spray Pumps Will Be Performed Using Instruments That Comply with Code Requirements,Per 990226 Telcon ML17313A8551999-03-0505 March 1999 Requests Proposed Code Alternative IAW 10CFR50.55a(e)(3),as Acceptable Alternative to Requirements of 10CFR50.55a(e)(1), for Installation of in-line safety-related Flow Measurement Instrument in ASME Class 3 Pipe ML17313A8241999-02-23023 February 1999 Advises That Kp Jarvis,License OP-50287-1,no Longer Needs to Maintain License as Permanently Assigned to Position Requiring No License ML17313A8111999-02-18018 February 1999 Forwards PVNGS Unit 3 7th Refueling Outage, Which Provides Complete Results of SG Tube Inservice Insp Performed,Per TS 5.6.8 ML17313A8721999-02-16016 February 1999 Discusses Resolution of Generic Safety Issue 171, ESF Failures from Loss-of-Offsite Power Subsequent to Loca. Util Has Low Vulnerability to Loca/Grid Collapse/Loop Scenario ML17313A7611999-01-22022 January 1999 Forwards PVNGS Unit 3 Inservice Insp Rept Seventh Refueling Outage, Per 10CFR50.55a.Ltr Contains No New Commitments 1999-09-08
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Text
CATEGORY 1 REGULAT INFORMATION DISTRIBUTIONOISTEM (RIDE)
ACCESSION..NBR:9709240013 DOC.DATE: 97/09/16 NOTARIZED: NO DOCKET ¹ FAClf".STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529.
STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH. NAME AUTHOR AFFILIATION LEVINE,J.M. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Forwards. info re PVNGS charging pump data 6 recent initiatives to improve charging pump performance as requested at 970902 Region IV Mgt Meeting.
DISTRIBUTION CODE: AOOID COPIES RECEIVED:LTR i ENCL ( SIZE:
TITLE: OR Submittal: General Distiibution E
NOTES:STANDARDIZED PLANT 05000528 Standardized plant. 05000529 Standardized plant. 05000530 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD4-2 LA 1 1 PD4-2 PD 1 1 THOMASFK 1 1 INTERNAL: ACRS 1 1 E C T 1 1 NRR/DE/ECGB/A 1 1 NRR 1 1 NRR/DRCH/HICB 1 1 NRR/DSSA/SPLB 1 1 NRR/DSSA/SRXB 1 1 NUDOCS-ABSTRACT 1 1 OGC/HDS2 1 0 D EXTERNAL: NOAC 1 1 NRC PDR 1 1 E
NOTE TO ALL MRIDSM RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR 14 ENCL 13
~nt. Innoetlm 8eryy.
James M. Levine TEL (602)393-5300 Mail Station 7602 Palo Verde Nuclear Senior Vice President FAX (602)3934077 P.O. Box 52034 Generating Station Nuclear Phoenix, AZ 85072-2034 I
102-04013- JML/SAB/RAS September 16, 1997 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station: P1-37 Washington, DC 20555-0001
Reference:
NRC Region IV Management Meeting, September 2, 1997
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2, and 3 Docket Nos. STN 50-528/529/530 PVNGS Charging Pump Performance During the NRC Region IV Management Meeting, on September,2, 1997, Arizona Public Service Company (APS) was requested to supply information regarding PVNGS charging pump data and recent initiatives to improve charging pump performance. In response to that request, APS has attached the requested information. contains a description of PVNGS charging pump design, Maintenance Rule Performance, recent charging p'ump events and system enhancements and initiatives intended to improve system performance. Attachment 2 contains graphical data depicting charging pump performance for the last 12 months.
Should you have questions regarding this submittal, please contact Scott A. Bauer at (602) 393-5978.
Sincerely, JML/SAB/RAS/mah Attachment cc: E. W. Merschoff K. E. Perkins K. M. Thomas PVNGS Sr. Resident 9709240019 9709i6- ' IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII PDR AOOCK 05000528
~DR
ATTACHMENT1 "PVNGS Charging Pump Performance "
lj' CHARGING PUMP DESCRIPTION Each PVNGS unit is supplied with three charging pumps which supply reactor coolant system (RCS) makeup, reactor coolant pump (RCP) seal injection and Pressurizer Auxiliary Spray flow. The charging pumps are three cylinder, positive displacement, reciprocating pumps. The design flowrate per pump is 44 gpm and design discharge head is 2735 psig. Typically, one charging pump is in continuous service, one is normally in service, and the third is in standby. The letdown and charging subsystem, which is part of the Chemical and Volume Control System (CVCS) is normally operated in automatic control by the pressurizer level controller to balance the letdown and charging rates and maintain pressurizer level within a programmed band. The positive displacement charging pumps are equipped with a leakage collection system and utilize suction stabilizers and pulsation dampers to minimize pressure fluctuations.
TECHNICALSPECIFICATION REQUIREMENTS PVNGS Technical Specification 3.1.2.4 requires two pumps to be operable when the unit is operating in Modes 1 through 4. Technical Specification 3.1.2.3 requires one pump to be operable when the unit is operating in modes 5 or 6. The safety related function of the charging pumps is to provide charging flow from the volume control tank, refueling water tank or spent fuel pool to the reactor coolant system.
CHARGING PUMP MAINTENANCERULE PERFORMANCE The PVNGS Maintenance Rule (MRule) Expert Panel currently classifies the CVCS as a High Risk system.
PVNGS has established train level goals for each of the three charging pumps which provide a method to address degraded performance of a single train even though the system function is still available.
The charging pump reliability goal is to have no Repetitive MRule Functional Failures within a 36 month rolling window, which has been met. In the past 36 months there have not been any repetitive MRule functional
(
failures. The goal for charging pump unavailability is 15% per pump, which has also been met. Since the implementation of the MRule in June 1996, PVNGS has never exceeded its unavailability goal of less than 15%. The current unavailability values (based on a rolling 12 month window) considering both planned and unplanned unavailability are:
6.90% 5 20% 1.87%
'.;.'CHB,'-,P02jj$ 4 55% 2.30% 3.31%
'.'-':~CHE-';P034%
4.43% 4.48% 0.92%
ATrACHMENT1 1 of5
P,YPIGS CHARGING PUMP PERFORMANCE A comparison of MRule unavailability data between PVNGS and other nuclear plants could be interpreted to indicate that PVNGS has a greater amount of unavailability hours per pump. However, PVNGS operates two charging pumps during normal operations due to the high demand of RCP seal injection, whereas other plants typically would operate a single charging pump. Since required pump maintenance can be directly correlated with pump run time, PVNGS expects to have a greater amount of unavailability hours.
RECENT, CHARGING PUMP EVENTS During the week of May 26, 1997, Unit 1 charging pumps CHA-P01 and CHB-P01 each experienced a failure that rendered the pumps inoperable. Neither failure challenged plant safety systems and subsequent investigations revealed that the failures were not related. Charging Pump CHA-P01 failed during post-maintenance functional testing due to being operated with low lube oil pressure. The root cause evaluation revealed that a damaged pressure gage gave an erroneous reading that led maintenance and operations personnel to run the pump with low oil pressure. Charging Pump CHB-P01 failed due to a loose connecting rod cap that led to a fatigue failure of the connecting rod/crosshead connection. The root cause evaluation revealed the vendor specified torque value for the connecting rod fasteners was too low. Corrective actions have been initiated to address the root cause of each failure and recurring failures are not expected.
During the week of July 21, 1997, the suction stabilizer of Unit 3 charging pump CHE-P01 failed and was declared inoperable. Inspection of the bladder revealed wear marks indicative of high bladder pressure.
However, this was not a maintenance rule functional failure since a failed suction stabilizer does not prevent the charging pump from performing its safety functions. Operations procedures have been clarified to allow a charging pump with a failed suction stabilizer to remain operable. In this case, the pump was declared inoperable as a conservative measure by the shift operations crew.
During the week of September 1, 1997, prior to the start of the seventh refueling outage, Unit 2 charging pump CHB-P01 was reworked to replace the suction stabilizer bladder. Also during this period, Unit 2 charging pump CHE-P01 was repacked. Neither condition prevented the charging pumps from performing their intended safety function.
Over the past 7 months, two failures have occurred in Unit 1 on the same weld at the inlet of 1" drain valve CHB-V943. The failures were not declared maintenance rule functional failures due to redundancy in charging system design. Actions have been taken to determine the root cause of the failure. So far, vibration readings have been inconclusive and the latest failed weld is under investigation. Additional vibration readings have been scheduled and will be taken during various system line-ups.
ATTACHMENT 1 2 of 5
PVNGS CHARGING PUMP PERFORMANCE CHARGING PUMP IMPROVEMENTS OVer the past several years, many modifications and enhancements have been made to improve the performance of the charging pumps. These modifications and enhancements in the predictive and preventive maintenance programs led to significant performance improvements in reliability and availability. The modiTications and enhancements include:
~ Through several design improvements (increased radius between the plunger and discharge check valve bores, shot peening stress concentration areas, change of material from 304 SS to 174-PH, removal of the land from the base of the discharge check valves, reduced size and relocation of the strongback bolt holes and lower torque on the strongback bolts) the approximate service life of a charging pump block has increased from 8,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> initially to 40,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> today (or about 4.5 years of continuous running).
~ A plant modification has been completed on all nine pumps to divide the charging pump drain well into two halves. Secondary packing (seal-lube water) leakage is now routed directly to the auxiliary building sumps via the pump room floor drain. Oil leakage continues to drain to the charging pump oil drain tank (CPODT). By eliminating the need for operators to frequently drain the CPODT, far fewer repacks are required. Pumps continue to be repacked upon identiTication of primary packing (RCS make-up water) leakage.
~ Water contamination of the crankcase oil during pump operation has been eliminated by installing a stainless steel "flinger" ring on the plungers of all nine charging pumps to prevent water from migrating from the process end to the power end of the pump plunger during operation. Since the modification was installed in 1996, the problem has not recurred.
~ Improved oil seals on the bearings of the charging pump gear reducers and an oil fill cap extension pipe have reduced oil leakage, leading to improved safety and material condition of the charging pump skid.
~ A material change on the charging pump primary packing from a braided style to a chevron style has significantly reduced primary packing leakage. As a conservative measure, the charging pumps are repacked upon identification of the slightest amount of primary packing leakage, which occurs approximately twice per year.
e The low lube oil alarm setpoint was increased from 10 psig to 18 psig to protect the pump from operating with a lube oil pressure that was not sufficient to protect the pump from damage.
~ Installation of pulsation dampers on the pumps has reduced stresses on the charging pump and system components. Precharge systems for the pulsation dampers and suction stabilizers, along with administrative controls have greatly reduced failures.
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P YPIGS CHARGING PUMP PERFORMANCE
~ Installation of "vampire" fittings on the oil drain ports of the crankcase and gearbox of each charging pump allows oil sampling without taking the pump out of service.
~ A unique laser block alignment method developed by the mechanical maintenance technicians has reduced the chance that the crossheads will incur damage during operation. Alignments are performed each time a block is replaced.
Synthetic oil is now used in the gearboxes which provides a better lubricating film and will be more resistant to break down during operation. Longer gearbox service life is expected.
~ A baffle plate installed in the crosshead region of the crankcase of Unit 2 charging pump CHE-P01 eliminated a chronic oil baffle packing leak on that pump. A Plexiglas crankcase cover installed during retest allowed visual verification of the effectiveness of the baNe plate.
~ Addition of a snubber in the oil line upstream of the low lube oil pressure switch has effectively eliminated switch, relay and gage damage. Pulsations in the lube oil system had previously caused excessive wear in the components.
~ The original lube oil filters were replaced with filters equipped with a pop up flag that activates upon high pressure drop indicating when the filter needs to be changed. Filters that were once changed out prematurely as a conservative preventative measure are now changed less frequently without adverse impact to the lube oil system.
PVNGS is now performing gear reducer rebuilds. Mechanics have attended training at the vendors facilities in Minnesota.
e Several changes have been made to facilitate removing charging pump blocks when required for maintenance activities. Hanger modifications, the addition of lifting pins on embed plates and erection of a temporary rigging scaffold have reduced the amount of time a pump is out of service when a block is removed.
~ Primary packing improvements and RP decontamination efforts have significantly reduced the amount of contamination in the charging pump rooms. Work such as a pump repack that was once performed in PC's, plastics and respirators can now be performed in a lab coat and gloves which results in a significant time savings.
ATTACHMENTI 4 of 5
k P VP/GS CHARGING PUMP PERFORMANCE
~ The charging pump maintenance procedure has been enhanced to provide more of the information that the maintenance technicians need when inspecting and reworking the charging pumps. Consolidating the documentation required to perform pump work improves the efficiency and reduces the time that the pump is out of service.
~ Improved scheduling of work has reduced the amount of time the pumps are down for maintenance.
Tasks are grouped together in a scheduling "windoW's opposed to taking the pump out for each individual task.
~ Regular sampling of oil and vibration readings on the charging pump crankcase and gearboxes provide trend data that is used to determine the optimal time for removing the pumps from service to perform maintenance.
SUMMARY
Reliability and unavailability of the charging pumps is currently acceptable to MRule targets and comparable to others in the industry for this type of pump and service cycle. PVNGS charging pumps have experienced no repetitive MRule functional failures, and are well within established unavailability goals. In addition, PVNGS continues to work to improve charging pump reliability'and availability.
ATTACHMENT1 5 of 5
ATTACHMENT2 "Charging Pump Performance Graphs"
Unit 1 Charging Pump Unavailability (12 month rolling window) 16%
14%
V v'l 10'/o Note 1 05 CI$
C 8%
D C
O Q
Cl 0.
6%
4%
2'/o CO Ch 0)
C-O X
Month
~CHA ~CHB ~CHE ~Performance Criteria ~ 1 st Trigger Perf Crit Note 1: The Maintenance Rule Expert Panel modified the 1st Trigger from 50/o to 75% of the Performance Criteria
Unit 2 Charging Pump Unavailability (12 month rolling window) 16%
14%
12/o 10'/o Note 1 CO CI$
8o/o D
C O
o CJ 0.
6o/o 4%
2/o 0'/o
~ ~ ~ CH A CH 8 CH E ~Performance Month Criteria ~~1st Trigger Perf Crit Note 1: The Maintenance Rule Expert Panel modified the 1st Trigger from 60/o to 75o/o of the Performance Criteria
Unit 3 Charging Pump Unavailability (12 month rolling window) 16%
14%
10'/o Note 1 cu Sh CO er co "c6% E 0 D oo (o
Cl I
Q I
6/.
~ 2r.
0'/o CO 0)
C zO Month
~CH A ~CH B ~CH E ~Performance Criteria ~ 1st Trigger Perf Crit Note 1: The Maintenance Rule Expert Panel modified the 1st Trigger from 50'/o to 75% of the Performance Criteria