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Category:CORRESPONDENCE-LETTERS
MONTHYEARTXX-9924, Forwards Responses to Questions by NRC Re Application for Amends to Licenses NPF-87 & NPF-89,by Incorporating Changes Increasing RWST low-level Setpoint from Greater than But Equal to 40% to Greater than But Equal to 45% of Span1999-10-22022 October 1999 Forwards Responses to Questions by NRC Re Application for Amends to Licenses NPF-87 & NPF-89,by Incorporating Changes Increasing RWST low-level Setpoint from Greater than But Equal to 40% to Greater than But Equal to 45% of Span ML20217M5711999-10-20020 October 1999 Forwards Insp Repts 50-445/99-15 & 50-446/99-15 on 990822- 1002.Two Severity Level IV Violations of NRC Requirements Identified & Being Treated as non-cited Violations Consistent with App C of Enforcement Policy TXX-9923, Forwards Monthly Operating Repts for Sept 1999 for CPSES, Units 1 & 2,per Plant TS 5.6.4.No Failures of Challenges to PORVs of SV for Units Occurred1999-10-15015 October 1999 Forwards Monthly Operating Repts for Sept 1999 for CPSES, Units 1 & 2,per Plant TS 5.6.4.No Failures of Challenges to PORVs of SV for Units Occurred ML20217E7951999-10-12012 October 1999 Forwards COLR for Unit 1,Cycle 8,per TS 5.6.5 ML20212L2891999-10-0101 October 1999 Discusses Closeout of GL 97-06, Degradation of Steam Generator Internals. Purpose of GL Was to Obtain Info That Would Enable NRC to Verify That Condition of Licensee SG Internals Comply with Current Licensing Bases TXX-9922, Forwards Revised COLR, for Cycle 5 for Unit 21999-10-0101 October 1999 Forwards Revised COLR, for Cycle 5 for Unit 2 ML20216J5571999-10-0101 October 1999 Provides Final Response to GL 98-01,suppl 1, Y2K Readiness of Computer Sys at Npps ML20212G0721999-09-24024 September 1999 Forwards Rev 4 to Augmented Inservice Insp Plan for CPSES, Unit 1. Future Changes & Revs to Unit 1 Augmented Inservice Insp Plan Will Be Available on Site ML20212H0461999-09-24024 September 1999 Forwards Rev 6 to CPSES Glen Rose,Tx ASME Section XI ISI Program Plan for 1st Interval on 990820 ML20212F7481999-09-24024 September 1999 Forwards SER Authorizing Relief from Exam Requirement of 1986 Edition ASME Code,Section XI Pursuant to 10CFR50.55a(a)(3)(ii) for Relief Request A-3 & 10CFR50.55a(g)(6)(i) for Relief Requests B15,16,17 & C-4 ML20212F1041999-09-23023 September 1999 Requests That NRC Be Informed of Any Changes in Scope of Y2K System Deficiencies Listed or Util Projected Completion Schedule for Comanche Peak Steam Electric Station,Units 1 & 2 ML20212E6661999-09-21021 September 1999 Advises That Info Contained in Application & Affidavit, (CAW-99-1342) Re WCAP-15009,Rev 0, Comache Peak Unit 1 Evaluation for Tube Vibration Induced Fatigue, Will Be Withheld from Public Disclosure ML20212D9111999-09-16016 September 1999 Informs That on 990818,NRC Completed Midcycle PPR of CPSES & Did Not Identify Any Areas in Which Performance Warranted Insp Beyond Core Insp Program.Core Insp Plan at Facility Over Next 7 Months.Insp Plan Through March 2000 Encl ML20212A7601999-09-14014 September 1999 Forwards Insp Repts 50-445/99-14 & 50-446/99-14 on 990707-0821.Four Violations Occurred & Being Treated as Ncvs.Conduct of Activities Was Generally Characterized by safety-conscious Operations & Sound Radiological Controls TXX-9921, Suppls 981221 LAR 98-010 to Licenses NPF-87 & NPF-89, Clarfying Conditions of Use Re Analytical Methods Used to Determine Core Operating Limits,Per Telcon with NRC1999-09-10010 September 1999 Suppls 981221 LAR 98-010 to Licenses NPF-87 & NPF-89, Clarfying Conditions of Use Re Analytical Methods Used to Determine Core Operating Limits,Per Telcon with NRC ML20211P3761999-09-0707 September 1999 Ack Receipt of Ltr Dtd 990615,transmitting Rev 30 to Physical Security Plan,Per 10CFR50.54(p).No NRC Approval Is Required ML20211L9871999-09-0303 September 1999 Forwards Rev 31 to Technical Requirements Manual. All Changes Applicable to Plants Have Been Reviewed Under Util 10CFR50.59 Process & Found Not to Include Any USQs TXX-9915, Responds to 990701 & 0825 RAI Telcons Re Spent Fuel Pool Temp,Per LAR 98-008,which Requested Increase in Spent Fuel Storage capacity.Marked-up Page 4-1 of CPSES Fuel Storage Licensing Rept, Encl1999-09-0303 September 1999 Responds to 990701 & 0825 RAI Telcons Re Spent Fuel Pool Temp,Per LAR 98-008,which Requested Increase in Spent Fuel Storage capacity.Marked-up Page 4-1 of CPSES Fuel Storage Licensing Rept, Encl ML20211K2231999-08-31031 August 1999 Forwards Txu Electric Comments of Rvid,Version 2 ML20211J3801999-08-27027 August 1999 Forwards Corrected TS Page 3.8-26 to Amend 66 to Licenses NPF-87 & NPF-89,respectively.Footnote on TS Page 3.8-26 Incorrectly Deleted ML20211G7301999-08-26026 August 1999 Forwards Revs 29 & 30 to CPSES Technical Requirements Manual (Trm). Attachments 1 & 2 Contain Description of Changes for Revs 29 & 30 Respectively ML20211G1081999-08-26026 August 1999 Responds to NRR Staff RAI Re Util Mar 1999 Submittal for NRC Review & Approval of Changes to CPSES Emergency Classification Procedure ML20211G3441999-08-25025 August 1999 Forwards Response to NRC RAI on LAR 98-010 for Cpses,Units 1 & 2.Communication Contains No New Licensing Commitments Re Cpses,Units 1 & 2 ML20211B2861999-08-18018 August 1999 Forwards Insp Repts 50-445/99-13 & 50-446/99-13 on 990720- 23.No Violations Noted.Insp Included Implementation of Licensee Emergency Plan & Procedures During Util Biennial Emergency Preparedness Exercise ML20211C4661999-08-18018 August 1999 Discusses Proprietary Info Re Thermo-Lag.NRC Treated Bisco Test Rept 748-105 as Proprietary & Withheld It from Public Disclosure,Iaw 10CFR2.790 ML20210U3981999-08-17017 August 1999 Forwards Monthly Operating Repts for July 1999 for CPSES, Units 1 & 2,per TS 6.9.1.5.No Failures or Challenges to PORVs or SVs for Plant Occurred ML20211C0991999-08-17017 August 1999 Forwards Rev 3 to ASME Section XI ISI Program Plan,Unit 2 - 1st Interval, Replacing Rev 2 in Entirety ML20211C4571999-08-16016 August 1999 Forwards Omitted Subj Page of Contractor TER TXX-9919, Forwards Relief Request A-3,Rev 1 to Unit 1 ISI Program,Per Conversations Between NRC & Txu Electric on 9908021999-08-16016 August 1999 Forwards Relief Request A-3,Rev 1 to Unit 1 ISI Program,Per Conversations Between NRC & Txu Electric on 990802 ML20210R6561999-08-13013 August 1999 Forwards Response to NRR 990805 Telcon RAI Re License Amend Request 98-010,to Increase Power for Operation of CPSES Unit 2 to 3445 Mwth & Incorporating Addl Changes Into Units 1 & 2 TS 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 ML20210S6411999-08-12012 August 1999 Informs That Wg Guldemond,License SOP-43780,is No Longer Performing Licensed Duties.Discontinuation of License Is Requested ML20210R2221999-08-12012 August 1999 Forwards Insp Repts 50-445/99-10 & 50-446/99-10 on 990510-0628.Violations Noted & Being Treated as Ncvs, Consistent with App C of Enforcement Policy ML20210N1101999-08-0404 August 1999 Provides Supplemental Info to Util 990623 License Amend Request 99-005 Re Bypassing DG Trips.Info Replaces Info Contained in Subject Submittal in Attachment 2,Section II, Description of TS Change Request 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 ML20210J2301999-08-0202 August 1999 Forwards Amend 96 to CPSES Ufsar.Replacement of FSAR Figures with Plant Process Flow Diagrams Meets Intent & Requirements of NRC Reg Guide 1.70,Rev 2 ML20210J6071999-08-0202 August 1999 Forwards line-by-line Descriptions of Changes in Amend 96 to CPSES UFSAR Transmitted by Util Ltr TXX-99166,dtd 990802. Replacment of FSAR Figures with Plant Process Flow Diagrams Meets Intent & Requirements of NRC Reg Guide 1.70,rev 2 TXX-9916, Notifies NRC That CPSES Units 1 & 2,improved TS Implemented on 9907271999-08-0202 August 1999 Notifies NRC That CPSES Units 1 & 2,improved TS Implemented on 990727 TXX-9918, Forwards CPSES 10CFR50.59 Evaluation Summary Rept 0008,for 970802-990201 & CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-9906301999-08-0202 August 1999 Forwards CPSES 10CFR50.59 Evaluation Summary Rept 0008,for 970802-990201 & CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-990630 ML20210K2321999-07-29029 July 1999 Forwards Insp Repts 50-445/99-12 & 50-446/99-12 on 990530-0710.No Violations Noted ML20210G5861999-07-29029 July 1999 Forwards fitness-for-duty Program Performance Data for Six Month Period of Jan-June 1999 ML20210J0121999-07-27027 July 1999 Forwards Summary of Methodology for Determination of NDE Measurement Uncertainty,In Response to Recent Discussions with NRC Re LAR 98-006 Concerning Rev to SG Tube Plugging Criteria TXX-9917, Provides Info Re Augmented Inservice Insp Plan,Which Requires Periodic Insp of Rv Head & Internals Lifting Devices at CPSES1999-07-26026 July 1999 Provides Info Re Augmented Inservice Insp Plan,Which Requires Periodic Insp of Rv Head & Internals Lifting Devices at CPSES ML20210F3121999-07-26026 July 1999 Responds to GL 99-02, Laboratory Testing of Nuclear-Grade Activated Charcoal, ML20210D8231999-07-23023 July 1999 Forwards Safety Evaluation of Relief Requests Re Use of 1998 Edition of Subsections IWE & Iwl of ASME Code for Containment Insp ML20210D3211999-07-21021 July 1999 Provides List of Estimates of Licensing Actions,In Response to Administrative Ltr 99-02,dtd 990603 ML20210C2931999-07-21021 July 1999 Supplements 880323 Response to NRC Bulletin 88-02, Rapidly Propagating...Sg Tubes, Non-proprietary WCAP-15010 & Proprietary Rev 0 to WCAP-15009, CP Unit 1 Evaluation for Tube Vibration... Encl.Proprietary Rept Withheld ML20209H0111999-07-16016 July 1999 Forwards Relief Request C-4 to CPSES Unit 2 ISI Program for Approval ML20210C3331999-07-16016 July 1999 Forwards Exam Repts 50-445/99-301 & 50-446/99-301 on 990618- 24.Exam Included Evaluation of Six Applicants for Senior Operator Licenses ML20209H2551999-07-16016 July 1999 Forwards ISI Summary Rept for Fourth Refueling Outage of CPSES Unit 2 & Containment ISI Summary Rept for Fourth Refueling Outage of CPSES Unit 2,per ASME Boiler & Pressure Vessel Code,Section Xi,Paragraph IWA-6230 1999-09-07
[Table view] Category:INCOMING CORRESPONDENCE
MONTHYEARTXX-9924, Forwards Responses to Questions by NRC Re Application for Amends to Licenses NPF-87 & NPF-89,by Incorporating Changes Increasing RWST low-level Setpoint from Greater than But Equal to 40% to Greater than But Equal to 45% of Span1999-10-22022 October 1999 Forwards Responses to Questions by NRC Re Application for Amends to Licenses NPF-87 & NPF-89,by Incorporating Changes Increasing RWST low-level Setpoint from Greater than But Equal to 40% to Greater than But Equal to 45% of Span TXX-9923, Forwards Monthly Operating Repts for Sept 1999 for CPSES, Units 1 & 2,per Plant TS 5.6.4.No Failures of Challenges to PORVs of SV for Units Occurred1999-10-15015 October 1999 Forwards Monthly Operating Repts for Sept 1999 for CPSES, Units 1 & 2,per Plant TS 5.6.4.No Failures of Challenges to PORVs of SV for Units Occurred ML20217E7951999-10-12012 October 1999 Forwards COLR for Unit 1,Cycle 8,per TS 5.6.5 ML20216J5571999-10-0101 October 1999 Provides Final Response to GL 98-01,suppl 1, Y2K Readiness of Computer Sys at Npps TXX-9922, Forwards Revised COLR, for Cycle 5 for Unit 21999-10-0101 October 1999 Forwards Revised COLR, for Cycle 5 for Unit 2 ML20212G0721999-09-24024 September 1999 Forwards Rev 4 to Augmented Inservice Insp Plan for CPSES, Unit 1. Future Changes & Revs to Unit 1 Augmented Inservice Insp Plan Will Be Available on Site ML20212H0461999-09-24024 September 1999 Forwards Rev 6 to CPSES Glen Rose,Tx ASME Section XI ISI Program Plan for 1st Interval on 990820 TXX-9921, Suppls 981221 LAR 98-010 to Licenses NPF-87 & NPF-89, Clarfying Conditions of Use Re Analytical Methods Used to Determine Core Operating Limits,Per Telcon with NRC1999-09-10010 September 1999 Suppls 981221 LAR 98-010 to Licenses NPF-87 & NPF-89, Clarfying Conditions of Use Re Analytical Methods Used to Determine Core Operating Limits,Per Telcon with NRC ML20211L9871999-09-0303 September 1999 Forwards Rev 31 to Technical Requirements Manual. All Changes Applicable to Plants Have Been Reviewed Under Util 10CFR50.59 Process & Found Not to Include Any USQs TXX-9915, Responds to 990701 & 0825 RAI Telcons Re Spent Fuel Pool Temp,Per LAR 98-008,which Requested Increase in Spent Fuel Storage capacity.Marked-up Page 4-1 of CPSES Fuel Storage Licensing Rept, Encl1999-09-0303 September 1999 Responds to 990701 & 0825 RAI Telcons Re Spent Fuel Pool Temp,Per LAR 98-008,which Requested Increase in Spent Fuel Storage capacity.Marked-up Page 4-1 of CPSES Fuel Storage Licensing Rept, Encl ML20211K2231999-08-31031 August 1999 Forwards Txu Electric Comments of Rvid,Version 2 ML20211G1081999-08-26026 August 1999 Responds to NRR Staff RAI Re Util Mar 1999 Submittal for NRC Review & Approval of Changes to CPSES Emergency Classification Procedure ML20211G7301999-08-26026 August 1999 Forwards Revs 29 & 30 to CPSES Technical Requirements Manual (Trm). Attachments 1 & 2 Contain Description of Changes for Revs 29 & 30 Respectively ML20211G3441999-08-25025 August 1999 Forwards Response to NRC RAI on LAR 98-010 for Cpses,Units 1 & 2.Communication Contains No New Licensing Commitments Re Cpses,Units 1 & 2 ML20210U3981999-08-17017 August 1999 Forwards Monthly Operating Repts for July 1999 for CPSES, Units 1 & 2,per TS 6.9.1.5.No Failures or Challenges to PORVs or SVs for Plant Occurred ML20211C0991999-08-17017 August 1999 Forwards Rev 3 to ASME Section XI ISI Program Plan,Unit 2 - 1st Interval, Replacing Rev 2 in Entirety TXX-9919, Forwards Relief Request A-3,Rev 1 to Unit 1 ISI Program,Per Conversations Between NRC & Txu Electric on 9908021999-08-16016 August 1999 Forwards Relief Request A-3,Rev 1 to Unit 1 ISI Program,Per Conversations Between NRC & Txu Electric on 990802 ML20210R6561999-08-13013 August 1999 Forwards Response to NRR 990805 Telcon RAI Re License Amend Request 98-010,to Increase Power for Operation of CPSES Unit 2 to 3445 Mwth & Incorporating Addl Changes Into Units 1 & 2 TS ML20210S6411999-08-12012 August 1999 Informs That Wg Guldemond,License SOP-43780,is No Longer Performing Licensed Duties.Discontinuation of License Is Requested ML20210N1101999-08-0404 August 1999 Provides Supplemental Info to Util 990623 License Amend Request 99-005 Re Bypassing DG Trips.Info Replaces Info Contained in Subject Submittal in Attachment 2,Section II, Description of TS Change Request TXX-9918, Forwards CPSES 10CFR50.59 Evaluation Summary Rept 0008,for 970802-990201 & CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-9906301999-08-0202 August 1999 Forwards CPSES 10CFR50.59 Evaluation Summary Rept 0008,for 970802-990201 & CPSES Commitment Matl Change Evaluation Rept 0003,for 970802-990630 ML20210J2301999-08-0202 August 1999 Forwards Amend 96 to CPSES Ufsar.Replacement of FSAR Figures with Plant Process Flow Diagrams Meets Intent & Requirements of NRC Reg Guide 1.70,Rev 2 ML20210J6071999-08-0202 August 1999 Forwards line-by-line Descriptions of Changes in Amend 96 to CPSES UFSAR Transmitted by Util Ltr TXX-99166,dtd 990802. Replacment of FSAR Figures with Plant Process Flow Diagrams Meets Intent & Requirements of NRC Reg Guide 1.70,rev 2 TXX-9916, Notifies NRC That CPSES Units 1 & 2,improved TS Implemented on 9907271999-08-0202 August 1999 Notifies NRC That CPSES Units 1 & 2,improved TS Implemented on 990727 ML20210G5861999-07-29029 July 1999 Forwards fitness-for-duty Program Performance Data for Six Month Period of Jan-June 1999 ML20210J0121999-07-27027 July 1999 Forwards Summary of Methodology for Determination of NDE Measurement Uncertainty,In Response to Recent Discussions with NRC Re LAR 98-006 Concerning Rev to SG Tube Plugging Criteria TXX-9917, Provides Info Re Augmented Inservice Insp Plan,Which Requires Periodic Insp of Rv Head & Internals Lifting Devices at CPSES1999-07-26026 July 1999 Provides Info Re Augmented Inservice Insp Plan,Which Requires Periodic Insp of Rv Head & Internals Lifting Devices at CPSES ML20210F3121999-07-26026 July 1999 Responds to GL 99-02, Laboratory Testing of Nuclear-Grade Activated Charcoal, ML20210C2931999-07-21021 July 1999 Supplements 880323 Response to NRC Bulletin 88-02, Rapidly Propagating...Sg Tubes, Non-proprietary WCAP-15010 & Proprietary Rev 0 to WCAP-15009, CP Unit 1 Evaluation for Tube Vibration... Encl.Proprietary Rept Withheld ML20210D3211999-07-21021 July 1999 Provides List of Estimates of Licensing Actions,In Response to Administrative Ltr 99-02,dtd 990603 ML20209H2551999-07-16016 July 1999 Forwards ISI Summary Rept for Fourth Refueling Outage of CPSES Unit 2 & Containment ISI Summary Rept for Fourth Refueling Outage of CPSES Unit 2,per ASME Boiler & Pressure Vessel Code,Section Xi,Paragraph IWA-6230 ML20209H0111999-07-16016 July 1999 Forwards Relief Request C-4 to CPSES Unit 2 ISI Program for Approval ML20209G0721999-07-13013 July 1999 Forwards Monthly Operating Repts for June 1999 for CPSES, Units 1 & 2,per TS 6.9.1.5.No Failures or Challenges to PORVs of SV Occurred During Reporting Period ML20209F0681999-07-0909 July 1999 Informs That Effective 990514,TU Electric Formally Changed Name to Txu Electric.Change All Refs of TU Electric to Txu Electric on Correspondence Distribution Lists ML20209E0421999-07-0909 July 1999 Forwards Response to NRC Request for Addl Info on LAR 98-010.Attachment 1 Is Affidavit for Info Supporting LAR 98-010 ML20209B6021999-06-30030 June 1999 Submits Second Response to NRC GL 98-01,Suppl 1, Y2K Readiness of Computer Sys at Npps. Readiness Disclosure for Reporting Status of Facility Y2K Readiness Encl ML20195J6981999-06-15015 June 1999 Provides Addl Info Related to Open Issue,Discussed in 990610 Conference Call with D Jaffe Re ISI Program Relief Request L-1 Submitted by Util on 980220 ML20196A4921999-06-15015 June 1999 Forwards Rev 30 to Physical Security Plan.Rev Withheld,Per 10CFR73.21 ML20195J0491999-06-14014 June 1999 Submits Response to RAI Re Implementation of 1.0 Volt Repair Criteria ML20195J0651999-06-14014 June 1999 Submits Response to RAI Re GL 95-07, Pressure Locking & Thermal Binding of Safety Related Power Operated Gate Valves 05000445/LER-1999-001, Forwards LER 99-001-00, Some Electrical Contacts for RCS Pressure Relief Valves Were Not Included in Surveillance Testing Procedures. New Licensing Commitments Identified in Attachment 11999-06-0808 June 1999 Forwards LER 99-001-00, Some Electrical Contacts for RCS Pressure Relief Valves Were Not Included in Surveillance Testing Procedures. New Licensing Commitments Identified in Attachment 1 ML20195F0091999-06-0808 June 1999 Forwards Response to RAI Re Units 1 & 2 ISI Program for Relief Requests E-1 & L-1.Communication Contains No New Licensing Basis Commitments Re Cpses,Units 1 & 2 ML20207E1921999-05-28028 May 1999 Submits Updated Request for NRC Staff to Review & Approve Certain Changes to CPSES Emergency Plan Submitted in 981015 & s Prior to Changes Being Implemented at CPSES ML20207E1711999-05-28028 May 1999 Supplements 990526 LAR 99-004 as TU Electric Believes Extingency Exists in That Proposed Amend Was Result of NOED Granted to Prevent Shudown of CPSES Unit 1 ML20207D9841999-05-26026 May 1999 Requests That NRC Exercise Enforcement Discretion to Allow Cpses,Unit 1 to Remain in Mode 1,power Operation,Without Having Performed Svc Test,Per SR 4.8.2.1d on Unit 1 Battery BT1ED2 ML20195B6351999-05-25025 May 1999 Submits Response to RAI Re GL 95-07, Pressure Locking & Thermal Binding of Safety Related Power Operated Gate Valves TXX-9912, Forwards Txu Electric (Formerly TU Electric) CPSES Emergency Preparedness Exercise Scenario Manual for 990721-22,Graded Exercise1999-05-21021 May 1999 Forwards Txu Electric (Formerly TU Electric) CPSES Emergency Preparedness Exercise Scenario Manual for 990721-22,Graded Exercise ML20206U1981999-05-20020 May 1999 Forwards Form 10K Annual Rept,Per 10CFR50.71(b). Communication Contains No New Licensing Basis Commitments Re Cpses,Units 1 & 2 ML20196L1931999-05-20020 May 1999 Forwards MOR for Apr 1999 for Cpses,Units 1 & 2.During Reporting Period There Have Been No Failures or Challenges to Power Operated Relief Valves or Safety Valves TXX-9911, Forwards non-proprietary & Proprietary Responses to RAI Re LAR 98-010 by Incorporating Attached Changes Into CPSES Unit 2 OL NPF-89 & CPSES Units 1,OL NPF-87 & 2 TS to Increase Licensed Power.W & Caldon Proprietary Responses Withheld1999-05-14014 May 1999 Forwards non-proprietary & Proprietary Responses to RAI Re LAR 98-010 by Incorporating Attached Changes Into CPSES Unit 2 OL NPF-89 & CPSES Units 1,OL NPF-87 & 2 TS to Increase Licensed Power.W & Caldon Proprietary Responses Withheld 1999-09-03
[Table view] Category:LEGAL/LAW FIRM TO NRC
MONTHYEARML20055E2741990-05-0101 May 1990 FOIA Request for Investigation Rept 4-89-008 ML20042E3291990-04-10010 April 1990 Advises That Due to Clerical Error,Author Ltrs to NRC Re Insp Repts 50-445/90-05 & 50-446/90-05 Not Served.Repts Will Be Served to All Parties on Attached List ML20042E3311990-03-31031 March 1990 Advises That Open Issues Re Thermo-Lag Insulation Matl & Harassment & Intimidation of QC Inspector Not Addressed in Insp Repts 50-445/90-05 & 50-446/90-05.CASE Questions Whether Formulas to Mfg Thermo-Lag Changed ML20042E3351990-03-28028 March 1990 Requests Listed Info or Basis for Specific Action Re C Grimes 900208 Ltr to J Cahill Re Issuance of License NPF-28,specifically Why Temporary Exemption from Schedular Requirements Granted ML20042E4301990-03-26026 March 1990 Lists Questions Based on Review of Insp Repts 50-445/89-88, 50-446/89-88,50-445/88-88 & 50-446/88-88,including Contamination Problems Found Inside Namco Switches in 1989 & Aircom Fasteners ML20043B7341990-03-0202 March 1990 FOIA Request for Records Re Insp Performed by C Williams on 900207-0302 Concerning ASME Section III Compliance Review & Weld 12A ML20011F0091990-02-0808 February 1990 Certifies That Util Covered for Decontamination Liability & Excess Property Insurance,Effective on 900208 ML20012D6361990-02-0505 February 1990 Responds to Util 891221 Ltr to NRC Re thermo-lag Dispute ML20012D5951990-02-0505 February 1990 FOIA Request for Documents & Records Relevant to & Generated in Connection W/Insp Repts 50-445/90-05 & 50-446/90-05 on 900131 Re Therm-o-Lag Issues ML20005G5381990-01-10010 January 1990 Urges Resolution of Issues in Dispute & Matters of Concern to Case Prior to Fuel Load Decision.Issues Include, Auxiliary Feedwater Check Valve & Pending Enforcement Action & Station Svc Water Sys Enforcement Action ML20005G5481990-01-0909 January 1990 Forwards Analytical Evaluation of Station Svc Water Sys for Facilities by Case Consultant J Doyle Dtd 891231.Rept Submitted to Document Events Re Removal of Plastite Liner in Station Svc Water Sys in Spring 1988 ML19354D7631990-01-0909 January 1990 Forwards Rev 0 to Case Final Rept, Analytical Evaluation of Station Svc Water Sys,Comanche Peak Nuclear Power Station. Rept Contains Conclusions Applicable to Issues of Regulatory Character & Competence of Util to Manage & Operate Plant ML20005G6951990-01-0909 January 1990 Corrected Ltr Discussing K Doyle Rept, Analytical Evaluation of Station Svc Water Sys for Comanche Peak. Rept Concludes That Probable Cause of Failures of Sys Due to Inability of Util Personnel to Perform Accurate Analysis ML20005G6751989-12-12012 December 1989 FOIA Request for Documents Re Insp Repts 50-445/89-23 & 50-446/89-23 on 890405-0502 ML20006B8811989-12-0505 December 1989 Appeals Denial of FOIA Request for App B Records ML19332F4911989-12-0101 December 1989 Discusses NRC 891027 Ltr to B Brink Re Citizens for Fair Util Regulation 891016 Request for Stay.Nrc Must Be Consistent in Application of NRC Procedures Re Probing of Allegations.Improprietaries Should Be Sought from Case ML20005G5441989-11-29029 November 1989 Requests That NRC Independently Conduct Insp/Investigation of Dispute Between Case & Util Re Thermo-Lag & Thermo Science,Inc Qc/Qa Breakdown.Util 891116 Ltr to Case Re Results of Investigation of Inspector a Concerns Encl ML20011D1221989-11-20020 November 1989 Discusses Concerns Re Integrity of Regulatory Process as Affecting Plant ML19332D7371989-10-0606 October 1989 FOIA Request for Records Re Chronology of Events Beginning 1985 ML19332F3141989-09-27027 September 1989 FOIA Request for Documents Re 890908 Insp Repts 50-445/89-38 & 50-446/89-38 ML20247R0381989-09-23023 September 1989 Advises of Case Position Re Need for Regulatory Enforcement Action in Response to Mgt Process & Administrative Control Failures Evidenced by 890505 Event at Facility ML20248C2711989-09-23023 September 1989 Requests Reclassification of Violations Noted in Insp Rept 50-445/88-47 & 50-446/88-42 on 880707-0802.Informs Case Believes Further Insp & Enforcement Review Appropriate ML20245J9341989-06-30030 June 1989 Forwards Util Response to Cap Rock Electric Cooperative,Inc Request for Order Modifying Antitrust License Conditions ML20248D6571989-06-16016 June 1989 Ofc of Inverstigations Subpoena to Jj Macktal,Nrc Investigation 4-89-008.* Requests Leave of 5 Days to Respond to Request Filed for Enforcement of Subpoena & to Brief Commission on Issues Re Subpoena ML20246K3781989-05-22022 May 1989 Requests Status of NRC Determination of Pending Fee Waiver Requests for FOIAs 89-47 & 89-52 ML20245A0381989-05-12012 May 1989 Forwards Request from Cap Rock Electric Cooperative,Inc for Order Enforcing & Modifying Antitrust License Conditions & Certificate of Svc.W/O Request ML20244D8701989-04-0606 April 1989 Forwards Endorsement 27 to Nelia NF-274 ML20246K3621989-03-30030 March 1989 Responds to Responding to Appeal of Denial of Fee Waivers for 890301 FOIA Requests.Justification for Fee Waiver Provided ML20246K3401989-03-0101 March 1989 Appeals Denial of Two Requests for Fee Waivers Re FOIAs 89-47 & 89-52 on Behalf of Jj Macktal & SM Hasan.Purpose of Requests to Examine Process Utilized by EDO & NRC for Revoking Confidentiality of Allegers ML20244D8771989-01-26026 January 1989 FOIA Request for Records Re Settlement Negotiations & Agreements in Licensing Proceedings Effectuated During Jul 1988 ML20246K2061989-01-25025 January 1989 FOIA Request for Records Re Revocation of Confidentiality on 890123 by V Stello & Requests for Info by Third Parties Which Concerns SM Hasan or Jj Macktal &/Or Respective Allegations About Facility ML20205D1401988-10-14014 October 1988 Forwards State of Tx Public Utils Commission Substantive Rule 23.66 Re Wheeling for Cogenerators ML20151U5971988-08-0808 August 1988 Requests Withdrawal of Portion of 860131 Filing Re Case Request for Imposition of Fine,For Suspension of Const Activities & for Hearing on Application to Renew CP ML20150E1411988-07-12012 July 1988 Forwards Suppl Filing of Response of Applicant to Motions to Stay,To Intervene & for Sua Sponte Relief Filed by Various Parties ML20150E2061988-07-10010 July 1988 Clarifies Relevant Issues Raised in LC Clark Re Recent Filings by J Doe.W/Supporting Info & Certificate of Svc ML20150D5031988-07-0808 July 1988 Forwards Motions to Intervene & for Sua Sponte Filed on Behalf of Citizens for Fair Util Regulation & Individual Residents ML20150D5091988-07-0707 July 1988 Forwards Substitute Pleadings of Petitioner J Doe ML20150D5261988-07-0606 July 1988 Forwards Motion for Permission to Withdraw Pleadings W/O Prejudice & W/Leave to File Substitute Pleadings within 48 H ML20151Y6221988-04-29029 April 1988 Forwards Wg Counsil Transmitting Errata to Project Status Repts for Mechanical Suppl a - Sys Interaction & Mechanical Suppl B - Fire Protection. Related Correspondence ML20151T7141988-04-26026 April 1988 Forwards Applicants Answers to Board 14 Questions Re Action Plan Results Rept VII.a.9.Checklists Used for Reinsp/ Documentation Review for 81 Items of Equipment & Matl Not Included W/Answers Due to Vol Amounting More than 1,000 Pp ML20151E9771988-04-0808 April 1988 Informs That Applicants Notified Board & Parties of Availability in TU Electric Document Room of Matls Ref in NRC Sser 14.W/Certificate of Svc ML20148M0221988-03-30030 March 1988 Forwards Exhibit 18 Introduced to Record by Counsel for co-owners During Williams 880218 Deposition & Pages 190-195 & 464-465 of Transcript,Representing Entire Contents of Deposition Re Exhibit.W/Certificate of Svc ML20148K3681988-03-24024 March 1988 Forwards Excerpts from Form 10-K Filed by Util W/Security & Exchange Commission.Excerpts Contain Financial Disclosures Re Facility.Info Provided to Keep Board Apprised of Matters Re Facility ML20150D0151988-03-21021 March 1988 Forwards Transcripts of Meeting Held on 871217-18 & 880218 Between Case & Util.W/O Encl.W/Certificate of Svc ML20150D0201988-03-18018 March 1988 Informs That on 880314,CASE Filed Tenth Progress Rept W/ Board & Urged Board to Review Transcript of Public Meetings Held Between Case & Applicants in Which Walsh/Doyle Issues Discussed.W/Certificate of Svc.Related Correspondence ML20148G1411988-03-17017 March 1988 Forwards Ltr of Even Date from Util to NRC Which Transmits Copies of Errata Prepared for Project Status Rept Re Cable Tray & Cable Tray Hangers & Conduit Supports Train C 2 Inch Diameter & Less ML20150D0381988-03-14014 March 1988 Forwards Util Informing That Licensee Still Collecting Documents for Files Containing Documentation for Result Rept VII.a.9 ML20196D5001988-02-0808 February 1988 Forwards Wg Counsil Transmitting Project Status Rept for Civil/Structural, Rev 0.Related Correspondence ML20195J0621988-01-15015 January 1988 Forwards Wg Counsil to Nrc,Transmitting Project Rept for Electrical, Rev 0.Rept Also Sent to J Ellis & Cygna.Related Correspondence ML20147D5771988-01-14014 January 1988 Forwards Util Form 8-K,current Repts, & 1214,filed W/Securities & Exchange Commission.Documents Forwarded as Part of Parties Efforts to Keep Board Apprised to Matters Re Facility.Related Correspondence 1990-05-01
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r Mann SCpwantZ 'N 8 RtCManD G. 800*C NaNCvt L.sttaevetu CccevaJ.e.u c. January 31,1986 JOC a. Davis En+C w.pttgesow Peter B. Bloch, Esq. Dr. Kenneth A. McCollom Chairman Dean Atomic Safety and Licensing Board Division of Engineering, U.S. Nuclear Regulatory Commission Architecture and Technology ;
Washington, D.C. 20555 Oklahoma State University Stillwater, Oklahoma 74074 Dr. Walter H. Jordan 881 West Outer Drive Elizabeth B. Johnson Oak Ridge, Tennessee 34830 Oak Ridge National Laboratory P. O. Box X, Building 3500 Oak Ridge, Tennessee 34830 Re: Texas Utilities Electric Company, et al (Comanche Peak Steam Electric Station, Units 1 & 2); Docket Nos. 50 445 and 50-44666
Dear Administrative Judges:
Applicants have this date delivered to Mr. Vincent S. Noonan Revision 1 of
! Appendix D, entitled "CPRT Sampling Approach, Applications, and Guidelines,"
developed by the Comanche Peak Response Team.
l l
As a part of our continuing effort to keep the Board apprised of matters l
which relate to the licensing of Comanche Peak, we are enclosing four copies of i
such revision. This revision is not being offered into evidence at this time, and is j' provided for information only.
9 Respective'ly,
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Robert A. Wooldridgy l
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. Peter B. Blo h Dr Wa hington D s ar.C.Regulatoryn manLic ., Chair LIST De .nKen et 2055 en ing Bo 5 Com ard nh A Arc hitea , Division . McColl mission Oklaho ctur e of om Stillw maS and Engine c ering \
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Mr . Tho ma 036 Rop.
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t SERVICE LIST Mr. Peter B. Bloch, Esq., Chairman Atomic Safety and Licensing Board U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Dr. Kenneth A. McCollom Dean, Division of Engineering, Architecture and Technology Oklahoma State University Stillwater, Oklahoma 74074 Elizabeth B. Johnson Oak Ridge National Laboratory ,
P. O. Box X, Building 3500 Oak Ridge, Tennessee 37830 Dr. Walter H. Jordan 881 West Outer Drive .
Oak Ridge, Tennessee 37830 Mrs. Juanita Ellis President, C ASE 1426 South Polk Street Dallas, Texas 75224 Renea Hicks, Esq.
Assistant Attorney General Environmental Protection Division P. O. Box 12548, Capitol Station Austin, Texas 78711 Nicholas S. Reynolds, Esq.
William A. Horin, Esq.
Bishop, Liberman, Cook, Purcell & Reynolds 1200 Seventeenth Street, N.W.
Suite 700 Washington, D.C. 20036 Mr. Thomas G. Dignan, Jr.
Mr. R. K. Gad, III -
Ropes & Gray 225 Franklin Street Boston, Massachusetts 02110 Mr. Roy P. Lessy, Jr.
Morgan, Lewis & Bockius 1800 M Street, N.W.
Washington, D.C. 20036 Robert D. Martin Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 s
1 Lanny A. Sinkin Christie Institute 1324 North Capitol Street Washington, D.C. 20002 Chairman Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. William L. Clements Docketing & Service Branch U.S. Nuclear Regulatory Commission Washington, D.C. 20555.
Stuart A. Treby, Esq.
Office of the Executive Director U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Chairman Atomic Safety and Licensing Appeal Panel ;
U.S. Nuclear Regulatory Commission ,
Washington, D.C. 20555 Ms. Ellen Ginsberg, Esq.
U.S. Nuclear Regulatory Commission 4350 East / West Highway,4th Flonr i
Bethesda, Maryland 20814 Billie Pirner Garde Citizens Clinic Director Government Accountability Project 1555 Connecticut Avenue, N.W.
Suite 202 Washington, D.C. 20036 Nancy Williams Cygna Energy Services,Inc.
101 California Street Suite 1000 San Francisco, California 94111 David R. Pigot Orrick, Herrington & Sutcliffe 600 Montgomery Street San Francisco, California 94111 Mr. Shannon Phillips Resident Inspector Comanche Peak SES c/o U.S. Nuclear Regulatory Commission P. O. Box 38 Glen Rose, Texas 76043 Anthony Roisman, Esq.
Executive Director Trial Lawyers for Public Justice 2000 P. Street, N.W., Suite 611 WashinRton o D.C. 20036 1
Joseph Gallo, Esq.
Isham, Lincoln & Beale 1120 Connecticut Ave., N.W.
Suite 840 Washington, D.C. 20036 Z TXX-4685 File No. 10068 TEXAS UTILITIES GENERATING COMPANY O M KT WAT T4 DWEN
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Mr. Vincent S. Noonan / gyp Director, Comanche Peak Project Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20599
SUBJECT:
Comanche Peak Steam Electric Station Submittal of Appendix D of the Comanche Peak Response Team (CPRT)
Program Plan
Dear Mr. Noonan:
Transmitted herewith is Revision 1 of Appendix D "CPRT O Sampling Approach, Applications and Guidelines" of the CPRT Program Plan. Recipients are asked to insert this Appendix after the tab " Appendix D Sampling" which was included in our submittal of Revision 3 of the Program Plan on January 27, 1986.
We still intend to submit Appendix E during the week of February 3 and the testing issue-specific action plans by March 1. Should you have any questions please do not hesitate to call either John Beck or myself.
Yours very truly,
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( W9 1.0 POLICY STATEMENT The Senior Review Team (SRT) has determined that, in general, it is unnecessary to examine an entire population of items or quantity of material in order to determine whether programmatic problems exist.
By sampling a portion, inferences can be made regarding the entire ,
population. The basis for CPRT decisions on design, construction, testing and QA/QC adequacy will be supported by sound engineering evaluation techniques, which often may include principles of sampling. Sampling and resulting inferences can be used as a powerful tool in identifying progransnatic safety-significant deficiencies in programs and processes. Although the process of drawing inferences from sampling is not the sole means of reaching reasonable assurance that the plant design and construction are '
adequate, sampling may be a significant contributor to that evaluation.
It is also recognized that, for sampling to result in meaningful information about a process or program, the items in the population to be sampled must be similar (i.e., homogeneous) in the O significant traits or attributes associated with that process or program. Some populations will be homogeneous by virtue of the
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work process by which they were made (e.g., ASME pipe support welding), others will be similar by virtue of the design activity 1
that created them (e.g., containment isolation valve closure time),
and so forth. Since sampling is utilized for a variety of purposes in the CPRT program it is essential that, when sampling is used, the population to be sampled is homogeneous and the objectives of the sampling are clearly tied to those of the action plan under consideration.
There are two basic ways to sample: one is to use judgment to select from a population those items that are likely to be the most critical, the other is to randomly select items from the general population (e.g., random selection of welds in a support structure). In the first method, called " biased sampling," the validity of one's inferences depend to a considerable extent on the validity of the investigator's prejudgment. In the second method, the samples are drawn randomly; and the resulting inferences depend on little or no bias from human prejudgment. Within the scope of the CPRT, both of these approaches are used to investigate various areas of interest and are justified within the context of their t
applications. In many cases, both approaches are used in the
! investigation of a single area of interest
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Rsvision: 1 Page 2 of 12 pm -
k_,) APPENDIX D (Cont'd) 2.0 APPLICATIONS The purpose of this appendix is to:
- Delineate the various applications of sampling within the CPRT program.
- Set forth consistent guidelines for the mechanics of selecting samples wherever random sampling techniques are used in ISAPs and DSAPs (including the TRT issues, the Design Adequacy Program and Quality of Construction Program).
2.1 Quality of Construction (QOC)
The construction process produces hardware by execution of a number at relatively uniform construction activities.
Therefore, the construction process is inherently susceptible to isolated hardware discrepancies. The overall frequency of deficiencies relative to the total number of opportunities is typically low, unless a programmatic problem exists.
m k,,) To obtain a consistent sampling approach in the QOC -
Reinspection / Document Review (Issue-Specific Action Plan VII.c), described as the self-initiated investigation in Appendix B, the SRT believed that an initial sample screen should be based on a specific standard. The SRT has concluded that a 95/5 sample plan, when used in the context of homogeneous populations of attributes, would provide a reasonable screen to detect programmatic or systematic deficiencies *. Such a screen would ensure a sufficient initial sample size to evaluate the adequacy of the safety-significant attributes associated with each of the homogeneous work activities (HWAs) in the VII.c investigation.
Accordingly, an initial random sample of at least 60 items is required for each homogeneous population (see Attachment 1, Table 1) .
j 2.2 Other ISAPs l
l Many of the other ISAPs (i.e., TRT issues) utilize sampling techniques to investigate specific areas of concern. In general, the SRT requires that the sample sizes in each of these cases be consistent, at a minimum, with that required by the use of a minimum 95/5 sample screen. Any exceptions to this general principal are approved by the SRT, based on a l
l case-specific review, and are reflected in the associated ISAP.
v
- A deficiency rate as low as 5% in a population will be detected by a 95/5 sampling plan with a probability or confidence level of 0.95.
l Ravision: 1 Page 3 of 12 (n)
%s,/ APPENDIX D (Cont'd) 2.0 APPLICATIONS (Cont'd) 2.3 Design Adequacy Program (DAP)
The focus of the Design Adequacy Program (DAP) is on the verification of the end products of the engineering and design process (i.e., designs represented by drawings, evaluations, '
or design specifications). In contrast to the construction process, where relatively few HWAs apply to large numbers of individual hardware items, the engineering and design process is characterized by a large number of homogeneous design activities (HDAs) with comparatively few design outputs being covered by each one.
The important aspect of the HDAs is that they include items for which a high degree of correlation exists in the design criteria, methodology, and procedures. Accordingly, evaluation of the adequacy of each EDA can be based on evaluating a representative selection of items within each EDA. The number of selected items will be sufficient to justify inferences and extrapolations that are appropriate for
/~ all items within each HDA. Attachment 4 of Appendix A to the (s_h CPRT Program Plan presents further details on the -
/
establishment of HDAs and the criteria for selecting items for evaluation.
If, in the event the DAP uses statistically-based sampling in the verification of any HDA, the sampling will be conducted in accordance with the provisions of this appendix.
3.0 GUIDELINES FOR RANDOM SAMPLING The purpose of the attached guidelines is to:
- Assist in the development of non-parametric sample screens for Issue-Specific Action Plans (ISAPs) or Discipline Specific Action Plans (DSAPs) where random sampling is used (Attachment 1),
- Outline the use of one-sided rolerance limits for evaluating special cases of parametric attributes (Attachment 2),
- Outline the basic methods to be used in generating random samples from a population of items or attributes (Attachment 3),
O
\ ,/ - Outline the methods to be used for expanding samples (Attachment 4).
. . _ . - - . - . . - - . - . . - - . - - - . - . . . . . - - - - - - _ . - - - - - .- . . - . ~ = - ~ .
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I Revision: 1 Page 4 of 12 T
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I APPENDIX D (Cont'd) b i 3.0 GUIDELINES FOR RANDOM SAMPLING (Cont'd)
These guidelines apply to sampling screens for most ISAPs and DSAPs. If other types of sampling applications arise, they must be considered on a case-by-case basis.
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Revision: 1 Page 5 of 12 APPENDIX D (Cont'd)
ATTACHMENT 1 GUIDELINES FOR SAMPLE INSPECTION OR REVIEW OF ATTRIBUTES Table 1 of this attachment is generally used by CPRT to determine the sample sizes and corresponding detection numbers which are consistent with a 95 percent confidence level (or 0.95 probability) on the 5, 2.5, and 1 percent upper bound population percentage screens. Unless otherwise justified and specifically approved by the SRT, the number of deficiencies allowed in the sample screen will be no more than one (see Attachment 4 for discussion of sample expansion where one deficiency is identified). These sampling plans are based on the assumption of an infinite population size and are conservative when compared to sampling plans based on finite populations. .
The minimum sample size for a 95/5 screen is 60 with a detection number of zero (i.e., the critical region is one or more detected items). This means that out of a random sample of 60 items inspected, if no items are found to belong to the classification of interest (e.g. , deficient),
there is a 95 percent confidence (or 0.95 probability) that less than 5
[~') percent of the population will be in this classification. If items
\s / belonging to the classification of interest are detected in a minimum -
sample (i.e., the number detected is in the critical region), the 95 percent upper-bound confidence limit (or 0.95 probability interval) will be greater than 5 percent. It is still possible that the population percentage is less than 5 percent, but based only on the initial sample evidence, the probability that this is so is less than 0.95.
A root cause evaluation of the deficiency is performed in order to isolate a potentially deficient stratum from the population. If such a stratum is identified, sample expansion into that stratum is used to verify that indeed the deficiency is associated with the identified stratum. Sample augmentation in the remaining population (minus the potentially deficient stratum) is used to verify that the deficiency is not associated with the remaining stratum. Sample expansion is further discussed in Attachment 4 to this appendix.
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Revision: 1 Page 6 of 12 5 APPENDIX D (Cont'd)
ATTACHMENT 1 (Cont'd)
- TABLE 1 SAMPLING PLANS FOR DETECTING UPPER-BOUND POPULATION PERCENTAGES (p ) l AT 95 PERCENT CONFIDENCE LEVEL
- SAMPLE SIZE ** DETECTION CRITICAL p = 5.0% p = 2.5% p,= 1.0% NUMBER REGION 60*** 120 300 0 1 or more '
95 190 474 1 2 or more 126 252 630 2 3 or more 155 310 775 3 4 or more 183 366 915 4 5 or more 210 421 1051 5 6 or more
- Or 0.95 probability level.
- Sample sizes are determined from A. H. Bowker, and G. J. Lieberman, Engineering Statistics, 2nd Edition, Prentice-Hall, 1972, page 538.
Note that these same sample plans may also be derived from Bayes' theorem, and are therefore applicable for sample expansion, using Bayes' theorem (see A. Boissonnade "CPRT Sampling Plans-Addendum,"
Civil / Structural / Mechanical CPRT File No. 11.1-005, or Box and Tiao, Bayesian Inference in Statistical Analysis, Addison-Wesley, 1973).
- For populations of 100 or fewer items, the minimum sample size may be reduced to 45, with a detection number of zero. This is based on the hypergeometric distribution.
Reference:
Lieberman, and Owen, Tables of the Hypergeometric Probability Distribution, Standard University Press, 1961.
b
Revision: 1 Page 7 of 12 Ns/ APPENDIX D (Cont'd)
ATTACHMENT 2 SAMPLING GUIDELINES FOR ONE-SIDED TOLERANCE LIMITS l In some special cases ISAPs or DSAPs (or an evaluation of an adverse trend) may require the determination of a parametric tolerance limit of a particular attribute associated with items of a population. The ,
acceptable quality of a population of items or quantity of material is often specified by setting a lower (upper) bound value based on the criterion that a certain percentage of the population fall above (below) this value (e.g., the concrete code specifies that at least 90 percent of the 28-day cylinder strengths fall above the required design strength). A lower (upper) bound population percentage is then inferred from a sample, compared with criterion value and the population either accepted as is, or corrective action taken. When a lower (upper) bound population percentage is specified in statistical terms, it is called a tolerance limit. A one-sided tolerance limit has the property that a certain percentage of the population of values (e.g., 90 percent) may be expected to fall above or below this bound with some level of confidence
, (e.g., 95 percent confidence).
A one-sided tolerance limit is defined as X - KS (X + KS), where X is O the sample average, and S is the sample standard deviation. The tolerance factor, K, is dependent upon the sample size, the specified population percentage above (below) the limit, and the desired level of confidence (e.g., the 95 percent confidence level). Once the confidence level has been selected and the population percentage specified, the sample size is only a function of the tolerance factor K. To lower the tolerance factor, it is necessary to increase the sample size. The relationship for several population percentages is listed in Table 2.
- For ISAPs or DSAPs requiring the use of one-sided tolerance limits, l sampling plans are developed by first determining, through engineering, materials, or other types of evaluations, that the underlying population
- distribution is either normal or log-normal *. Then, as a minimum, a j sample size of 50 is obtained. The actual sample size selected,
- however, takes into account the difficulty in obtaining the sample and l
how sensitive the resulting conclusions are to the actual tolerance j limit. l There is no unique sample size to be used..for any particular tolerance l limit problem. However, it is obvious from Table 2 that it becomes increasingly difficult to lower the tolerance factor as the sample size increases. From a practical point of view, sample sizes between 50 and 100 provide reasonable tolerance factors for the sampling effort.
- A goodness-of-fit test should be used to aid in evaluating the I
f reasonableness of the assumed underlying distributions. Any tolerance limit applications for which the underlying population l distribution cannot be reasonably assumed to be normal or l
l log-normal will be handled on a case-by-case basis.
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Revision: 1 Page 8 of 12
/ APPENDIX D (Cont'd)
ATTACHMENT 2 (Cont'd)
TABLE 2 4
ONE-SIDED TOLERANCE LIMIT l FACTORS, K FOR 95 PERCENT CONFIDENCE LEVEL First* Fifth* Tenth
(ninety-ninth) (ninety-fifth) (ninetieth) l Sample Sice Percentile Percentile Percentile Percentile 5 5.75 4.21 3.41 0.90 0.56 10 3.98 2.91 2.36 15 3.52 2.91 2.36 0.45 20 3.30 2.40 1.93 0.38 25 3.16 2.29 1.84 0.34 30 3.06 2.22 1.78 0.31 35 2.99 2.17 1.73 0.28 i
40 2.94 2.13 1.70 0.26 50 2.86 2.07 1.65 0.24 -
70 2.77 1.99 1.58 0.20 100 2.68 1.93 1.53 0.17 300 2.52 1.80 1.42 0.10 l
Reference:
D. B. Owen, Handbook of Statistical Tables, Addison Wesley, 1962, page 126. Note that the first percentile means that 99 percent of the population falls above, one percent falls below.
Reference:
F. A. Webster, " Developing Sampling Plans for TRT Issues",
Civil / Structural / Mechanical CPRT, File No. 11.1-001, 3/12/85.
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ATTACHMENT 3 GUIDELINES FOR GENERATING RANDOM SAMPLES I
The procedure for generating a random sseyle begins by first defining the unit to be sampled (e.g., truckloads of concrete, conduit runs, conductor terminations, etc.), then determining the total number of i
these units or items in the population. Note that the population, so defined, may actually be a subpopulation which has certain specified engineering attributes (i.e., a stratum). Each unit in the population (or stratum) must be assigned a unique sequential number 1 through N, where N is the total number of units. A table of random digits or a random number generator is then used to develop a random sequence of units from the population. Table 3 outlines the complete procedure. .
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ATTACHMENT 3 (Cont'd)
TABLE 3 PROCEDURE FOR GENERATING A RANDOM SAMPLE FROM A POPULATION .
- 1. Determine population size, N, and number each item sequentially, 1, 2, ...N.
- 2. Start at a random position in a table of random digits or use a random seed in a random number generator and perform the following steps for each random five digit decimal fraction in sequence, '
until desired sample size is obtained.
- 3. If using a table of random digits, place a decimal point in front of each set of five digits
- and multiply by the population size.
If using a random number generator which produces five digit decimal fractions *, simply multiply by the population size.
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\s_/ 4. Retain only the ipgeger part of the above product and add 1. This - -
will define the i item to be included in the random sample.
- 5. It is usually a good idea to generate a longer list of randomly selected items in case a particular item is inaccessible in the field, or in case the same item is selected more than once.
Example: Generate a sample of 300 items from a population of size 3791.
RN1 = .04146** x 3791 = 157.17486 == 157 + 1 = 158 RN2 = .23432 x 379L = 888.30712 == 888 + 1 = 889 RN3 = .74381 x 3791 = 2,819.78371 == 2,819 + 1 = 2,820 RN300 = .59221 x 3h91 = 2,245.06810 == 2,2k5 + 1 = 2,2d6
- A five digit random decimal fraction is only useful on populations of 10,000 items or less. Additional random digits must be used in l the decimal fraction if larger populations are sampled.
Reference:
The Rand Corporation, A Million Random Digits, Free
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Press, 1955, p. 355.
Revision: 1 Page 11 of 12 i APPENDIX D (Cont'd)
ATTACHMENT 4 I
GUIDELINES ON SAMPLE EXPANSION 4
The primary reason for continuing a sampling investigation is to determine if detected deficiencies are systematic or random, and aid in '
their evaluation. It may also be used as an aid in evaluating adverse trends and their root cause(s).
If the 95 percent upper-bound confidence limit (or probability interval) calculated from the sample 13 greater than 5 percent, the population of items is said to have failed the screen and further investigation is necessary. If one deficiency is detected in the initial minimum sample
, of items (or one or more different attributes in the case of VII.c) and '
no root cause can be identified, sample expansion in the entire population, including all attributes, will continue until it is l determined that either the deficiency is a random occurrence of very low
! frequency, or a trend or programmatic deficiency is identified in the l population (i.e., a potentially deficient stratum *). If a deficiency is detected in the initial sample and a root cause that implicates only a subset of attributes is identified, a reduced set of attributes will be 1'
' considered in the sample expansion. If a sample is found to contain -
deficiencies or an adverse trend associated with items possessing a certain characteristic and not with items that do not possess this characteristic, a subset of items possessing these certain
' characteristics will be considered in the sample expansion. If '
4 deficiencies continue to be detected in the expanded sample, or two or more deficiencies of the same type are detected in the initial minimum sample, and they cannot be associated with a specific stratum, 100 percent of the population will be inspected or reviewed.
Sample expansion into a stratum will be required when it has been
! determined or hypothesized that the stratum contains and bounds the adverse trends or deficiencies of the type detected in the initial sample. Such a stratum may be identified by an adverse trend in the l
' initial sample or by a root cause evaluation originating inside or l
outside the population of items being inspected or reviewed. Sample l expansion into a stratum proceeds in one of the following ways:
- The stratum is identified completely, separated from the general population, items numbered sequentially from one to the total number and then randomly selected, or
- As used in the CPRT program, stratum will refer to either
- 1) a subset of items in the population,
-/ 2) a set of attributes of items in the population, or 3) a set of attributes for a subset of items in the population.
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i 2 APPENDIX D
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) ATTACHMENT 4 2
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- The stratum is left within the general population and random 7
t sampling is continued in the general population until the required sample size is obtained in the stratum. ,
If there is no identified root cause for the initial deficiency or adverse trend, sample expansion in the general population is required to i verify that the deficiency detected in the initial sample was a random l
occurrence of low fzequency. When sample expansion is performed only for a stratum, the sample in the general population (minus the identified stratum) will be augmented with additional items to bring the i general population sample back to the minimum 95/5 sample size.
For example, if one deficiency is found in an initial sample using the minimum 95/5 sample screen, and no stratum can be identified, then an additional 35 randomly selected items is needed (note: this is based on i Bayes' theorem). If a deficiency is found in an initial minimum 95/5 sample, and a stratum is identified and removed for separate
)O investigation, enough additional items must be randomly selected from the general population minus the identified stratum to bring the total sample back up to the minimum 95/5 sample size. In addition, the sample size in the stratum must total 95. Any items that were selected from the stratum in the initial sample are included as part of the sample expansion in the stratum. If no more deficiencies are detected, then the sample will pass the 95/5 screen and the conclusion will be made l
that the deficiencies are random and of very low frequency in the population (i.e., there was no programmatic breakdown).
l Generating an expanded sample in the general population follows the same rules for generating the initial random sample. The sampling will start
- where the initial sample ended (see Table 3 of Attachment 3). Table 1 I in Attachment I should be used as a guide for sample expansion in those
- cases where ISAP sample plans deviate from the general minimum 95/5 l sample screen.
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