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Category:MEETING MINUTES & NOTES--CORRESPONDENCE
MONTHYEARML20206S6461999-02-17017 February 1999
Summary of ACRS Reliability & Probabilistic Risk Assessment, Plant Operations & on Regulatory Policies & Practices Subcommittees 981119-20 Meeting in Rockville,Md Re Options Make 10CFR50 & 10CFR50.59 risk-informed
ML20206S4381999-01-25025 January 1999
Summary of 458th ACRS Meeting on 981203-05 in Rockville,Md Re Appropriate Action on Items Listed in Attached Agenda
ML20206S6611999-01-11011 January 1999
Summary of 981215-17 ACRS Thermal Hydraulic Phenomena Subcommittee Meeting in Rockville,Md Re T/H Code Activities/ NRC T/H Research Status
ML20206S6101998-12-23023 December 1998
Summary of ACRS Reliability & Probabilistic Risk Assessment Subcommittee 981029 Meeting in Rockville,Md Re Options to Make 10CFR50 risk-informed,NEI Whole Plant Study & Options for Developing risk-informed Approach,Revising 10CFR50.59
ML20206S8501998-11-13013 November 1998
Summary of 456th ACRS Meeting on 980930-1002 in Rockville,Md Re Appropriate Action on Items Listed in Attached Agenda
ML20206S2481998-11-12012 November 1998
Summary of 455th ACRS Meeting on 980902-04 in Rockville,Md Re Items Listed in Attached Agenda
ML20206S7621998-11-12012 November 1998
Summary of 980924 ACRS Submommittee on Reliability & PRA Open Meeting in Rockville,Md Re Proposed Options for Developing risk-informed Approach to Revising 10CFR50.59, Options for Broader Changes to 10CFR50
ML20206S4161998-09-29029 September 1998
Summary of 980826 Open ACRS Subcommittee on Reliability & PRA Meeting in Rockville,Md Re Issues in SRM on situation-specific Cases Where PRA Results & Insights Have Improved Existing Regulatory Sys
ML20206S3851998-09-0303 September 1998
Summary of 980729 Open ACRS Joint Meeting of Subcommittees on Plant Operations & Fire Protection in Atlanta,Ga Re Region II Activities & Other Items of Mutual Interest, Including Significant Operating Events & Fire Protection
ML20206S6831998-09-0101 September 1998
Summary of 453rd ACRS Meeting on 980603-05 in Rockville,Md Re Appropriate Action on Items Listed in Attached Agenda
ML20206S3761998-08-24024 August 1998
Summary of 980716 ACRS Plant License Renewal Subcommittee Meeting in Rockville,Md Re Presentations by & Holding Discussions with NRC Staff Re License Renewal,Proposed Staff Plans & Schedule for Reviewing License Renewal Applications
ML20206S3811998-08-0404 August 1998
Summary of ACRS Safety Research Program Subcommittee Meeting on 980717 in Rockville,Md Re Comments & Recommendations in 980616 ACRS Rept, Core Research Capabilities & Associated Staff Response
ML20206S3721998-07-29029 July 1998
Summary of 980707 ACRS Advanced Reactor Designs Subcommittee Meeting in Rockville,Md Re Info on AP600 Test & Analysis Program & Responses to ACRS Questions Asked During Previous Meetings
ML20206S6721998-07-0808 July 1998
Summary of ACRS Safety Research Program Subcommittee 980601 Meeting in Rockville,Md Re Discussion with NRC Concerning SECY-98-076, Core Research Capabilities
ML20206S3671998-06-30030 June 1998
Summary of 980619 Open ACRS Meeting of Subcommittee on Plant Operations in Rockville,Md Re Proposed Changes to 10CFR50.59,status of Resolution of Issues Identified in 980324 SRM Related to SECY-97-205 & Related Matters
ML20206S3501998-06-26026 June 1998
Summary of 980617-18 ACRS Advanced Reactor Designs Subcommittee Meeting in Rockville,Md Re Review of Advance FSER Chapters 4,5,7,8,11,13 & 18,level 1 AP600 Pra,Itaac & Associated ACRS Open Questions
ML20206S5991998-06-23023 June 1998
Summary of ACRS Reactor Fuels,Onsite Fuel Storage & Decommissioning Subcommittee 980423-24 Meeting in Rockville, MD Re Basis of Proposed NRC Fuel Failure Criterion for High Burnup Conditions & Adequacy of NRC Fuel Codes
ML20206S3361998-06-22022 June 1998
Summary of 980611-12 Open ACRS Thermal Hydraulic & Severe Accident Phenomena Subcommittee Meeting in Rockville,Md Re Continuance of Review of Results of W Test & Analysis Program in Support of AP600 Design Certification
ML20206S6411998-06-22022 June 1998
Summary of 980601 ACRS Matls & Metallurgy Subcommittee Meeting in Rockville,Md Re NRC Staff Concerns Related to ASME Boiler & Pressure Vessel Code,Section III Rule Revs
ML20206S2561998-06-17017 June 1998
Summary of 452nd ACRS Meeting on 980430-0502 in Rockville, MD Re Items Listed in Attached Agenda
ML20206S6301998-06-17017 June 1998
Summary of 980602 ACRS Thermal Hydraulic & Severe Accident Phenomena Subcommitteemeeting in Rockville,Md Re GE Extended Power Uprate Program for Operating BWRs & NSP lead-plant Application for Power Uprate
ML20206S5761998-06-0404 June 1998
Summary of ACRS Reliability & Probabilistic Risk Assessment Subcommittee 980416 Meeting in Rockville,Md Re Subcommittees Review of Matters Related to Elevation of CDF & Possible Rev to Commissions Safety Goal Policy Statement
ML20206S5671998-05-30030 May 1998
Summary of ACRS Advanced Reactor Designs Subcommittee 980513-15 Meeting in Rockville,Md Re Review of AP600 Standard SAR & Associated Advanced FSER Chapters 3,6,14,16 & 17
ML20206S2521998-05-14014 May 1998
Summary of 451st ACRS Meeting on 980402-04 in Rockville,Md Re Items Listed in Attached Agenda
ML20206S2801998-04-30030 April 1998
Summary of 980219-20 ACRS Open Meeting of Subcommittee on Reliability & Probabilistic Risk Assessment in Rockville,Md Re Continuance of Review of Proposed Final SRP Sections & RGs for risk-informed,performance-based Regulation
ML20206S2951998-04-15015 April 1998
Summary of 450th ACRS Meeting on 980305-07 in Rockville,Md Re Items Listed in Attached Agenda
ML20206S2871998-04-15015 April 1998
Summary of 449th ACRS Meeting on 980302-04 in Rockville,Md Re Items Listed in Attached Agenda
ML20206S6481998-03-26026 March 1998
Summary of ACRS Fire Protection Subcommittee 980122 Meeting in Rockville,Md Re Staff Actions Taken Related to Development of Revised Fire Protection Rule
ML20196L0531998-03-20020 March 1998
Summary of 980205-07 ACRS 448th Meeting in Rockville,Md Re Items Listed in Attached Agenda
ML20206S6561998-03-13013 March 1998
Summary of ACRS Plant License Renewal Subcommittee 980123 Meeting in Rockville,Md Re License Renewal Implementation Issues & Proposed Industry Guidelines
ML20206S2751998-03-0909 March 1998
Summary of 980218 ACRS Thermal Hydraulic & Severe Accident Phenomena Subcommittee Open Meeting in Rockville,Md Re Review of RES Program in Area of thermal-hydraulic Phenomena in Support of ACRS Planned Rept to Commission
ML20217A8561998-03-0505 March 1998
Summary of ACRS 448th Meeting on 980205-07 Re Several Matters & Completed Listed Rept & Ltr.Committee Authorized Larkins,Executive Director,To Transmit Memoranda Listed
ML20206S6791998-03-0505 March 1998
Summary of ACRS Plant Operations Subcommittee 980203 Meeting in Rockville,Md Re Subcommittee Review of Proposed Improvements to Senior Mgt Meeting Process
ML20206S2651998-02-23023 February 1998
Summary of 980203-04 ACRS Subcommittee on Advanced Reactor Designs Open Meeting in Rockville,Md Re Review of Chapters 1,4,5,7,8,11,13 & 18 of AP600 Ssar & AP600 Test & Analysis Program
IR 07100203/20064471998-02-0505 February 1998
Summary of 971203-06 447th ACRS Meeting in Rockville,Md Re Appropriate Action on Items Listed in Attached Agenda
ML20206S3931998-01-28028 January 1998
Summary of 980121 ACRS Subcommitee on Human Factors Meeting in Rockville,Md Re Human Performance & Reliability Plan & Integration of Human Factors Insights Into Insp Process
ML20217A8461998-01-0909 January 1998
Summary of ACRS Plant Operations Subcommittee 971202 Meeting in Rockville,Md Re SER on industry-sponsored Utility Resolution Guidance for Issue of Blockage of Suction Strainer in ECCS
ML20217A8771997-12-23023 December 1997
Summary of ACRS 446th Meeting on 971106-07 in Rockville,Md Re Appropriate Action on Items Listed on Attached Agenda.W/ Fr Notice,Meeting Schedule & Outline,List of Attendees, Future Agenda & List of Documents Provided to Committee
ML20217A9911997-12-23023 December 1997
Summary of 447th ACRS Meeting on 971203-06 Re Proposed Revs to 10CFR50.59 & Credit for Containment Overpressure to Provide Assurance of Sufficient Net Positive Suction Head for ECC & Containment Heat Removal
ML20217A8651997-12-15015 December 1997
Summary of ACRS Reliability & PRA Subcommittee 971112-13 Meeting in Rockville,Md Re Proposed Final SRP for risk- informed,performance-based Regulation
ML20217A9831997-12-0303 December 1997
Summary of 971203 ACRS Meeting in Rockville,Md Re Conduct of ACRS Business
ML20217A5901997-12-0202 December 1997
Summary of 445th ACRS Meeting in Rockville,Md on 971002-03 Re Appropriate Action on Items Listed in Attached Agenda.W/ Fr Notice,Meeting Schedule & Outline,List of Attendees, Future Agenda & List of Documents Provided to Committee
ML20217A8811997-12-0202 December 1997
Summary of ACRS Safety Research Program Subcommittee 971104- 05 Meeting in Rockville,Md Re NRC Safety Research Program & Draft Annual Rept to Congress
ML20217A8221997-12-0101 December 1997
Informs That During 446th Meeting on 971106-07,ACRS Discussed Several Matters & Completed Listed Ltr. Committee Authorized Larkins,Executive Director,To Transmit Memoranda,Listed
ML20217A8901997-11-21021 November 1997
Summary of ACRS Reliability & PRA 971021-22 Meeting in Rockville,Md Re Matter Included in Staff Requirements Memo,
ML20217A6381997-11-0606 November 1997
Summary of 444th ACRS Meeting in Rockville,Md on 970903-05 Re Appropriate Action Items Listed in Attached Agenda.W/Fr Notice,Meeting Schedule & Outline,List of Attendees & List of Documents Provided to Committee
ML20217B1921997-11-0606 November 1997
Summary of ACRS Planning & Procedures Subcommitte 971105 Meeting in Rockville,Md Re Conduct of ACRS Business
ML20217A8001997-10-21021 October 1997
Informs That During 445th Meeting on 971002-03,ACRS Discussed Several Matters & Completed Listed Rept & Ltrs. Committee Authorized Larkins,Executive Director,To Transmit Memoranda Listed
ML20217A7011997-10-20020 October 1997
Summary of 970826-27 ACRS Subcommittees on Matls & Metallurgy & on Severe Accidents Joint Meeting W/Nrc,Nei & Industry in Rockville,Md Re Review of Proposed Draft GL & Associated Draft Regulatory Guide Re SG Tube Integrity
ML20217A8141997-10-20020 October 1997
Summary of ACRS Subcommittees on Pra,Plant Operations & Fire Protection 970828-29 Meeting in Rockville,Md Re Review of Staff Requirements Memo
1999-02-17
[Table view]Some use of "" in your query was not closed by a matching "".
Category:MEETING SUMMARIES-INTERNAL (NON-TRANSCRIPT)
MONTHYEARML20206S6461999-02-17017 February 1999
Summary of ACRS Reliability & Probabilistic Risk Assessment, Plant Operations & on Regulatory Policies & Practices Subcommittees 981119-20 Meeting in Rockville,Md Re Options Make 10CFR50 & 10CFR50.59 risk-informed
ML20206S4381999-01-25025 January 1999
Summary of 458th ACRS Meeting on 981203-05 in Rockville,Md Re Appropriate Action on Items Listed in Attached Agenda
ML20206S6611999-01-11011 January 1999
Summary of 981215-17 ACRS Thermal Hydraulic Phenomena Subcommittee Meeting in Rockville,Md Re T/H Code Activities/ NRC T/H Research Status
ML20206S6101998-12-23023 December 1998
Summary of ACRS Reliability & Probabilistic Risk Assessment Subcommittee 981029 Meeting in Rockville,Md Re Options to Make 10CFR50 risk-informed,NEI Whole Plant Study & Options for Developing risk-informed Approach,Revising 10CFR50.59
ML20206S8501998-11-13013 November 1998
Summary of 456th ACRS Meeting on 980930-1002 in Rockville,Md Re Appropriate Action on Items Listed in Attached Agenda
ML20206S2481998-11-12012 November 1998
Summary of 455th ACRS Meeting on 980902-04 in Rockville,Md Re Items Listed in Attached Agenda
ML20206S7621998-11-12012 November 1998
Summary of 980924 ACRS Submommittee on Reliability & PRA Open Meeting in Rockville,Md Re Proposed Options for Developing risk-informed Approach to Revising 10CFR50.59, Options for Broader Changes to 10CFR50
ML20206S4161998-09-29029 September 1998
Summary of 980826 Open ACRS Subcommittee on Reliability & PRA Meeting in Rockville,Md Re Issues in SRM on situation-specific Cases Where PRA Results & Insights Have Improved Existing Regulatory Sys
ML20206S3851998-09-0303 September 1998
Summary of 980729 Open ACRS Joint Meeting of Subcommittees on Plant Operations & Fire Protection in Atlanta,Ga Re Region II Activities & Other Items of Mutual Interest, Including Significant Operating Events & Fire Protection
ML20206S6831998-09-0101 September 1998
Summary of 453rd ACRS Meeting on 980603-05 in Rockville,Md Re Appropriate Action on Items Listed in Attached Agenda
ML20206S3761998-08-24024 August 1998
Summary of 980716 ACRS Plant License Renewal Subcommittee Meeting in Rockville,Md Re Presentations by & Holding Discussions with NRC Staff Re License Renewal,Proposed Staff Plans & Schedule for Reviewing License Renewal Applications
ML20206S3811998-08-0404 August 1998
Summary of ACRS Safety Research Program Subcommittee Meeting on 980717 in Rockville,Md Re Comments & Recommendations in 980616 ACRS Rept, Core Research Capabilities & Associated Staff Response
ML20206S3721998-07-29029 July 1998
Summary of 980707 ACRS Advanced Reactor Designs Subcommittee Meeting in Rockville,Md Re Info on AP600 Test & Analysis Program & Responses to ACRS Questions Asked During Previous Meetings
ML20206S6721998-07-0808 July 1998
Summary of ACRS Safety Research Program Subcommittee 980601 Meeting in Rockville,Md Re Discussion with NRC Concerning SECY-98-076, Core Research Capabilities
ML20206S3671998-06-30030 June 1998
Summary of 980619 Open ACRS Meeting of Subcommittee on Plant Operations in Rockville,Md Re Proposed Changes to 10CFR50.59,status of Resolution of Issues Identified in 980324 SRM Related to SECY-97-205 & Related Matters
ML20206S3501998-06-26026 June 1998
Summary of 980617-18 ACRS Advanced Reactor Designs Subcommittee Meeting in Rockville,Md Re Review of Advance FSER Chapters 4,5,7,8,11,13 & 18,level 1 AP600 Pra,Itaac & Associated ACRS Open Questions
ML20206S5991998-06-23023 June 1998
Summary of ACRS Reactor Fuels,Onsite Fuel Storage & Decommissioning Subcommittee 980423-24 Meeting in Rockville, MD Re Basis of Proposed NRC Fuel Failure Criterion for High Burnup Conditions & Adequacy of NRC Fuel Codes
ML20206S6411998-06-22022 June 1998
Summary of 980601 ACRS Matls & Metallurgy Subcommittee Meeting in Rockville,Md Re NRC Staff Concerns Related to ASME Boiler & Pressure Vessel Code,Section III Rule Revs
ML20206S3361998-06-22022 June 1998
Summary of 980611-12 Open ACRS Thermal Hydraulic & Severe Accident Phenomena Subcommittee Meeting in Rockville,Md Re Continuance of Review of Results of W Test & Analysis Program in Support of AP600 Design Certification
ML20206S2561998-06-17017 June 1998
Summary of 452nd ACRS Meeting on 980430-0502 in Rockville, MD Re Items Listed in Attached Agenda
ML20206S6301998-06-17017 June 1998
Summary of 980602 ACRS Thermal Hydraulic & Severe Accident Phenomena Subcommitteemeeting in Rockville,Md Re GE Extended Power Uprate Program for Operating BWRs & NSP lead-plant Application for Power Uprate
ML20206S5761998-06-0404 June 1998
Summary of ACRS Reliability & Probabilistic Risk Assessment Subcommittee 980416 Meeting in Rockville,Md Re Subcommittees Review of Matters Related to Elevation of CDF & Possible Rev to Commissions Safety Goal Policy Statement
ML20206S5671998-05-30030 May 1998
Summary of ACRS Advanced Reactor Designs Subcommittee 980513-15 Meeting in Rockville,Md Re Review of AP600 Standard SAR & Associated Advanced FSER Chapters 3,6,14,16 & 17
ML20206S2521998-05-14014 May 1998
Summary of 451st ACRS Meeting on 980402-04 in Rockville,Md Re Items Listed in Attached Agenda
ML20206S2801998-04-30030 April 1998
Summary of 980219-20 ACRS Open Meeting of Subcommittee on Reliability & Probabilistic Risk Assessment in Rockville,Md Re Continuance of Review of Proposed Final SRP Sections & RGs for risk-informed,performance-based Regulation
ML20206S2871998-04-15015 April 1998
Summary of 449th ACRS Meeting on 980302-04 in Rockville,Md Re Items Listed in Attached Agenda
ML20206S2951998-04-15015 April 1998
Summary of 450th ACRS Meeting on 980305-07 in Rockville,Md Re Items Listed in Attached Agenda
ML20206S6481998-03-26026 March 1998
Summary of ACRS Fire Protection Subcommittee 980122 Meeting in Rockville,Md Re Staff Actions Taken Related to Development of Revised Fire Protection Rule
ML20196L0531998-03-20020 March 1998
Summary of 980205-07 ACRS 448th Meeting in Rockville,Md Re Items Listed in Attached Agenda
ML20206S6561998-03-13013 March 1998
Summary of ACRS Plant License Renewal Subcommittee 980123 Meeting in Rockville,Md Re License Renewal Implementation Issues & Proposed Industry Guidelines
ML20206S2751998-03-0909 March 1998
Summary of 980218 ACRS Thermal Hydraulic & Severe Accident Phenomena Subcommittee Open Meeting in Rockville,Md Re Review of RES Program in Area of thermal-hydraulic Phenomena in Support of ACRS Planned Rept to Commission
ML20217A8561998-03-0505 March 1998
Summary of ACRS 448th Meeting on 980205-07 Re Several Matters & Completed Listed Rept & Ltr.Committee Authorized Larkins,Executive Director,To Transmit Memoranda Listed
ML20206S6791998-03-0505 March 1998
Summary of ACRS Plant Operations Subcommittee 980203 Meeting in Rockville,Md Re Subcommittee Review of Proposed Improvements to Senior Mgt Meeting Process
ML20206S2651998-02-23023 February 1998
Summary of 980203-04 ACRS Subcommittee on Advanced Reactor Designs Open Meeting in Rockville,Md Re Review of Chapters 1,4,5,7,8,11,13 & 18 of AP600 Ssar & AP600 Test & Analysis Program
IR 07100203/20064471998-02-0505 February 1998
Summary of 971203-06 447th ACRS Meeting in Rockville,Md Re Appropriate Action on Items Listed in Attached Agenda
ML20206S3931998-01-28028 January 1998
Summary of 980121 ACRS Subcommitee on Human Factors Meeting in Rockville,Md Re Human Performance & Reliability Plan & Integration of Human Factors Insights Into Insp Process
ML20217A8461998-01-0909 January 1998
Summary of ACRS Plant Operations Subcommittee 971202 Meeting in Rockville,Md Re SER on industry-sponsored Utility Resolution Guidance for Issue of Blockage of Suction Strainer in ECCS
ML20217A9911997-12-23023 December 1997
Summary of 447th ACRS Meeting on 971203-06 Re Proposed Revs to 10CFR50.59 & Credit for Containment Overpressure to Provide Assurance of Sufficient Net Positive Suction Head for ECC & Containment Heat Removal
ML20217A8771997-12-23023 December 1997
Summary of ACRS 446th Meeting on 971106-07 in Rockville,Md Re Appropriate Action on Items Listed on Attached Agenda.W/ Fr Notice,Meeting Schedule & Outline,List of Attendees, Future Agenda & List of Documents Provided to Committee
ML20217A8651997-12-15015 December 1997
Summary of ACRS Reliability & PRA Subcommittee 971112-13 Meeting in Rockville,Md Re Proposed Final SRP for risk- informed,performance-based Regulation
ML20217A9831997-12-0303 December 1997
Summary of 971203 ACRS Meeting in Rockville,Md Re Conduct of ACRS Business
ML20217A5901997-12-0202 December 1997
Summary of 445th ACRS Meeting in Rockville,Md on 971002-03 Re Appropriate Action on Items Listed in Attached Agenda.W/ Fr Notice,Meeting Schedule & Outline,List of Attendees, Future Agenda & List of Documents Provided to Committee
ML20217A8811997-12-0202 December 1997
Summary of ACRS Safety Research Program Subcommittee 971104- 05 Meeting in Rockville,Md Re NRC Safety Research Program & Draft Annual Rept to Congress
ML20217A8221997-12-0101 December 1997
Informs That During 446th Meeting on 971106-07,ACRS Discussed Several Matters & Completed Listed Ltr. Committee Authorized Larkins,Executive Director,To Transmit Memoranda,Listed
ML20217A8901997-11-21021 November 1997
Summary of ACRS Reliability & PRA 971021-22 Meeting in Rockville,Md Re Matter Included in Staff Requirements Memo,
ML20217B1921997-11-0606 November 1997
Summary of ACRS Planning & Procedures Subcommitte 971105 Meeting in Rockville,Md Re Conduct of ACRS Business
ML20217A6381997-11-0606 November 1997
Summary of 444th ACRS Meeting in Rockville,Md on 970903-05 Re Appropriate Action Items Listed in Attached Agenda.W/Fr Notice,Meeting Schedule & Outline,List of Attendees & List of Documents Provided to Committee
ML20217A8001997-10-21021 October 1997
Informs That During 445th Meeting on 971002-03,ACRS Discussed Several Matters & Completed Listed Rept & Ltrs. Committee Authorized Larkins,Executive Director,To Transmit Memoranda Listed
ML20217A7011997-10-20020 October 1997
Summary of 970826-27 ACRS Subcommittees on Matls & Metallurgy & on Severe Accidents Joint Meeting W/Nrc,Nei & Industry in Rockville,Md Re Review of Proposed Draft GL & Associated Draft Regulatory Guide Re SG Tube Integrity
ML20217A8141997-10-20020 October 1997
Summary of ACRS Subcommittees on Pra,Plant Operations & Fire Protection 970828-29 Meeting in Rockville,Md Re Review of Staff Requirements Memo
1999-02-17
[Table view]Some use of "" in your query was not closed by a matching "". |
Text
__. _ _ _ _ _ . _. -_ _ _ _ _ _ _ . _ _ .._ - . - _ _ _ ._ _ .._ _ . _ _ . - _ _ _ _ . _
' CERTIFIED BY:
Date Issued: 4/22/96 gGeorge Apostolakis - 6/14/96 IN } 5 N f[."[.' y g , gg W it- d .J $ N dgh ADVISORY COMMITTEE ON REACTOR SAFEGUARDS /#M/Yd
, PROBABILISTIC RISK ASSESSMENT SUBCOMMITTEE MEETING MINUTES FEBRUARY 27-28, 1996 ROCKVILLE, MARYLAND INTRODUCTION The ACRS Subcommittee on Probabilistic Risk Assessment (PRA) met i on February 27-28, 1996, at 11545 Rockville Pike, Rockville, MD,
, in Room T-2B3. The purpose of this meeting was to discuss topics related to Risk-Based Regulatory Applications (RBRA), including 1 identification of models, analyses and regulatory issues that are i currently amenable to risk-based regulatory approach, and the use l of PRA in the regulatory decision-making process. The entire meeting was open to public attendance. Mr. Michael T. Markley
, was the cognizant ACRS staff engineer for this meeting. The
. meeting was convened at 8:30 a.m. each day and recessed at 5:00 p.m. on February 27 and adjourned at 5:30 p.m. on February 28.
ATTENDERS ACRS G. Apostolakis, Chairman R. Seale, Member ,
r I. Catton, Member D. Karydas, Invited Expert 1
M. Fontana, Member T. Theofanous, Invited Expert {
T. Kress, Member M. Markley, ACRS Staff i
- 'W. Lindblad, Member R. Sherry, ACRS Senior Fellow l i
1 Principal r'C Sceakers !
- M. Cunningham, RES l P. Baranowsky, AEOD
! A. El-Bassioni, NRR
- l. E. Butcher, NRR !
j J. Flack, NRR i M. Cheok, NRR W. Hodges, RES
] G. Holahan, NRR 4
T. Hsia, NRR 2 S. Mays, AEOD
! A. Ramey-Smith, RES
< M. Rubin, NRR I
Industrv/Public M. Azarm, BNL R. Grantom, HL&P T. Cannon, APS M. Moddares, UMD J. Fulford, NUS B. Putney, SAIC
. M. Golay, MIT N. Siu, BNL ,
D. True, ERIN O(tM-lACC$
9610070108 960422 8 O( M - G f4*EN"jf DESIC nTD OEIOINAL PDR ACRS 1 PDR
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PRA Subcommittee February 27-28, 1996 Minutes A complete list of meeting attenders is in the ACRS Office File, and will be made available upon request. The presentation slides and handouts used during the meeting are attached to the office copy of these minutes.
Chairman's Ooenino Remarks Dr. George Apostolakis, Chairman of the Subcommittee convened the meeting and reviewed the purpose of the meeting. He introduced the ACRS Invited Experts Dr. Dimitrios Karydas and Dr. Theo Theofanous; guest speakers Messrs. Herschel Specter and Mohammed Modarres; and ACRS Senior Fellow Mr. Rick Sherry who also made a presentation. He noted that the Commission had requested ACRS views on the PRA framework document, its relationship to the pilot applications, and the next steps to expand the use of PRA in the regulatory decision-making process. He also mentioned that the ACRS had received some documents from Mr. Bob Christie of Performance Technology regarding programs for performance-based regulation, what performance-based regulation might look like, and what we learn from turbine-driven pump surveillance testing.
NRC Staff Presentation Mr. Gary M. Holahan, Director, Division of Systems Safety and Analysis (DSSA), NRR, provided an overview of the PRA program, the PRA Policy Statement, framework for regulatcry activities, and efforts to accelerate the program in response to the NRC Chairman's memorandum dated November 30, 1995. He discussed the ongoing nature of the pilot applications and their role during Standard Review Plan (SRP) and regulatory guide development. He reviewed the schedule for completing the following pilot applications: motor operated valves (MOVs), inservice testing (IST), inservice inspection (ISI), Technical Specifications (TS),
graded quality assurance (GQA), and pilot inspections of the implementation of the Maintenance Rule. Significant points made during the discussion include:
e Elements of the PRA framework include identification and characterization of regulatory activities, deterministic and probabilistic considerations, and the integration of those considerations e Application groups include screening analysis for prioritization of generic issues and licensing activities; risk ranking analysis for GQA, IST, ISI, and the Maintenance Rule (i.e. establishing goals commensurate with safety); and detailed analysis for TS, backfits, and generic issue resolution
l A -
PRA Subcommittee February 27-28, 1996 Minutes e Key technical issues include:
Deterministic considerations: engineering principles based on search test and analysis (sound engineering analysis) quality of design (design bases) and operation (operating experience); defense-in-depth; appropriate codes and standards, and single failure criterion (General Design Criteria)
Probabilistic considerations: PRA quality - data, assumptions, and methods; PRA scope - internal and/or external events, at power and/or shutdown, and PRA levels 1, 2, 3; risk metrics - core damage frequency (CDF), importance measures, safety goals, containment performance, and dose; sensitivity and uncertainty analysis; and the process for reviewing quality -
industry peer review, staff review, etc.
Integration of risk insights: review bases for both deterministic and probabilistic considerations, l reconcile differences to achieve acceptable risk and !
engineering conditions, assure net change in CDF and j risk are small, and assure overall risk impact is compatible with other PRA-related guidance e The process for reviewing quality includes:
External peer review and comparison with similar PRAs for applications that depend on relative results (i.e.
risk ranking, plant modifications); expert panels are necessary in risk ranking to preclude relying on PRA results alone NRC staff review and national laboratory reviews for I applications that depend on absolute risk measures (i.e. TS modifications) e Additional factors to consider in specific applications include: effects on screening analysis results, effects on PRA assumptions used in analysis, common-cause failures j resulting from current applications, human errors of ;
commission and omission, spatial and equipment interactions !
The Subcommittee and NRC staff extensively discussed the role of performance criteria. Dr. Apostolakis expressed the view that it should be considered a key technical issue. The staff reviewed the PRA Policy Statement but indicated that the NRC did not have a performance-based policy statement. This led to lengthy discussion regarding the absence of a performance-based approach in the PRA program.
o
\ * .
PRA Subcommittee -4 -
February 27-28, 1996 l Minutes The Subcommittee also discussed the acceptability of models used I in PRAs and the level of detail. Dr. Apostolakis expressed the l belief that the NRC should make some statement regarding the acceptability or unacceptability of certain models. The staff stated that regulatory guides provide methods acceptable to the NRC in meeting regulatory requirements. Licensees can submit alternate approaches, but regulatory guides do not identify unacceptable methods. The staff expressed the desire for the pilot studies to provide information on the needed data bases and level of detail required to provide meaningful insights. Dr.
Kress expressed the view that Level 3 PRA was unavoidable in regulating to limit risk to the public. The staff stated that an l understanding of Level 3 effects was necessary; however, they '
could make an argument where Level 3 would do more harm than good if it results in the NRC departing from assuring defense in depth.
The Subcommittee also discussed issues related to numerical decision criteria: CDF, containment performance, dose, importance measures, and safety goals. The staff expressed the view that total reliance on quantitative results is not appropriate and that ntn-quantitative considerations should be taken into v1 2 The staff emphasized that they were not trying to 6- -
what good PRA is but rather to provide guidelines for gu cing risk insights into the regulatory decision-making process. Dr. Apostolakis expressed the view that numerical criteria should not be pass / fail. The Subcommittee questioned the staff's view on risk neutrality (i.e., changes that neither increase nor decrease risk). The staff and members of the audience repeatedly stated that changes could not contribute to increases in risk. Drs. Apostolakis and Kress questioned whether safety goals could be or should be extended to plant-specific conditions. The NRC suaff stated that the NRC policy on safety goals was not to apply them to individual plants because of potential abuse of the information by external organizations.
ACRS Fellow Presentation Mr. Rick Sherry, ACRS Fellow, provided a presentation on importance measures. He reviewed the background and objectives, questions associated with risk ranking, calculational methodologies and importance curves, and measures for uncertainty importance. Significant points made during the discussion include:
e Risk measures include core damage frequency (CDF), large early release frequency, offsite consequences or other appropriate measures of risk the model can determine e Credible changes in a basic model can be defined as a variation within the estimated uncertainty range of an event
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February 27-28, 1996 Minutes probability or a change in the event probability resulting from a variation in the environment of the event e Importance measures for risk ranking include risk achievement worth (RAW), risk reduction worth (RRW), Fussel-Vesely Importance, Birnbaum Importance, and Criticality Importance e Difficulties in using importance measures include truncation, multiple basic events representing component failures, and absolute or relative ranking The NRC staff acknowledged that importance measures are important when considering such things as reduced equipment testing frequency. Guest presenter Herschel Specter questioned the impact of uncertainty on risk rankings. Mr. Sherry emphasized I that this study focused on uncertainty for point measures. Dr.
Kress noted that evaluating uncertainty helps provide conservatism that helps in the decision-making process.
ACRS Invited ExDert Presentati2D Dr. Dimitrios Karydas, Invited Expert to the ACRS, presented performance-based standards for fire protection. Dr. Karydas reviewed items related to materials, regulations and codes of practice, elements of fire safety engineering, fire uncertainties, cone calorimeter and related standards, fire standards for buildings, the benefits of fire safety engineering, fire safety design and acceptance criteria, and international activities in fire standards development. Significant points made during the discussion include: -
e Models and parameters are based on flame or heat growth rate I but uncertainties are not addressed in codes l
c Cone calorimetry is not sufficient for a performance-based approach e There are no standards in the United States for performance-based standards for fire protection and there has been limited progress toward performance-based concepts e Most performance-based work is being done in international standards development e The overall approach in fire protection is in prevention (eliminating the primary hazard and initiating events) and in control over the propagation of fires The NRC staff noted that their approach focuses on results or outputs as opposed to inputs. Guest presenter, Dr. Theofanous
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r PRA Subcommittee February 27-28, 1996 l Minutes pointed out that the fire protection has benefitted greatly from actual fire experience whereas the nuclear industry has not had a l lot of accidents on which to base criteria. Mr. Holahan noted q that the NRC has taken a different performance-based approach.
He emphasized that the NRC intends to maintain their defense-in-depth philosophy-which he believes has served the agency well. I i The Subcommittee extensively discussed the issues of 4
probabilistic acceptance criteria for risk. They discussed the difference between the " maximum tolerable" risk to an individual member of the public as opposed to the " generally accepted" risk to members of the public. Key points of discussion were the general acceptance that some fires will occur and that volunteers acccot higher risks as part of certain activities. A significant point of difference was noted in the acceptance of quantitatively higher-levels of risk for fire than nuclear technology.
ACRS Invited Excert Presentation Dr. Theofanous, ACRS Invited Expert, reviewed his draft paper,"On the Proper Formulation of Safety Goals and Assessment of Safety Margins for Rare and High-Consequence Hazards." His discussion ,
was focused on technical, policy, and philosophical issues. '
Significant points made during the presentation include:
- For rare and high consequence events, the collective uncertainty becomes so large that it is counterproductive to quantify it. He suggested that modeling may mask inherent vulnerabilities e The main need for integration of deterministic and probabilistic considerations is at the goal level e He suggested that a basic consideration of defense in depth along with practical aspects of communication and synergism are needed for resolution of uncertainties. He defined his approach as Risk Oriented Accident Analysis Methodology (ROAAM) ,
The NRC staff expressed concern over the difficulty with quantifying uncertainty. The staff agreed with Dr. Theofanous' view that the uncertainties can become so large that they become an impediment to gaining meaningful risk insights. They further stated that the major impediment was poor quality analysis rather than uncertainty. The Subcommittee discussed concepts of uncertainty (epistemic and aleatory uncertainty) . Dr. Theofanous stated that uncertainty needs to be managed; otherwise, the complication of so many parameters causes the calculation to explode and lose meaning.
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February 27-28, 1996 Minutes Presentation by Hershel Soecter/Mohammad Moddares Messrs. Specter and Moddares presented their work to develop a l functional specifications for a software program for risk-based and performance-based regulation. They reviewed the process to i select software for review, the identification of risk-based tasks, matching software with risk-based tasks, identifying tasks I without software support, and developing specifications for l integrated softwarte. Significant points made during the l discussion include: ,
e The overall concept was to develop something like a risk monitor or risk meter.
e The approac.1 was to set up risk categories (high, medium, and low) ana go through analyses to distribute the results into those categories.
e The process entails establishing criteria, identifying what to monitor, setting goals, observing actual performance, trending results, and implementing corrective actions as necessary.
- The goals of the process are to be comprehensive, consistent, dynamic, and synergistic to make informed risk-based decisions.
Dr. Apostolakis questioned how management issues fit into the framework. Mr. Specter stated that the organizational issues were reflected in human reliability assessment (HRA) numbers.
Dr. Theofanous stated that he believed the model was more systems and component oriented. The NRC staff stated that many of their programs involve components and equipment not modeled in PRA.
Subcommittee Comments and Concerns At the close of the meeting, subcommittee Members provided their observations and concerns. Specific issues of concern were:
o separation of performance-based from risk-informed concepts and the apparent lack of a performance-based approach e The need to make judgements on acceptable methods for verifying risk using some criteria e Confusion over the use of terminology e Linkage between the PRA framework, pilot applications, and the need for some decision criteria or justification for the pilots
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February 27-28, 1996 Minutes Subcommittee Recommendations The PRA Subcommittee plans to draft a letter for consideration by the full ACRS regarding the PRA framework document, pilot applications, and the next steps to expand the use of PRA in the regulatory decision-making process. This item is scheduled for the 429th meeting of the Advisory Committee on Reactor Safeguards on March 7-9, 1996. The ACRS needs to respond to the Commission's Staff Requirements Memorandum (SRM), dated December 27, 1995, regarding this matter. i Followuo Actions Representatives of the NRC staff agreed to provide the Subcommittee copies of the NRC Peer Review Guide and a risk study completed at the University of Lund (Sweden).
Backaround Material Provided to Subcommittee for this Meetina e Staff requirements memorandum dated December 27, 1995
- Staff requirements memorandum dated June 16, 1995 e Letter dated January 3, 1996, from J. Taylor, EDO, to Chairman Jackson, NRC, Subj: " Improvements Associated With !
Managing the Utilization of Probabilistic Risk Assessment i (PRA) and Digital Instrumentation and Control Technology" I e Letter dated November 30, 1995, from Chairman Jackson, NRC, 1 to J. Taylor, EDO, Subj: " Follow-up Requests in !
Probabilistic Risk Assessment and Digital Instrumentation !
and Control" e SECY-95-280, " Framework for Applying Probabilistic Risk Analysis in Reactor Regulation," dated November 27, 1995 e Letter dated November 14, 1995, from W. Rasin, NEI, to J.
Milhoan, DEDRO, Subj: Draft report, " Improving the Regulatory Process Through Risk-Based and Performance-Based Regulation" e Purpose Statement / List of Issues for PRA Subcommittee on January 10-11, 1996 e Reliability Engineering and System Safety 38, 1992, "The Strengths and Limitations of PSA: Where We Stand," D. Bley, S. Kaplan, and D. Johnson
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l PRA Subcommittee February 27-28, 1996 Minutes
- i f e Reliability Engineering and System Safety 35, 1992, " Showing Compliance with Probabilistic Safety Criteria and Objectives," M. Versteeg
- e Reliability Engineering and System Safety 39, 1993, "Probabilistic Safety Assessment Development in the United 3 States 1972-1990," E. Beckjord, M. Cunningham, J. Murphy 9
e Fire Safety Science, Proceedings of the Fourth International j Symposium 1994, Abstract, " Rational Structural Fire ;
4 Engineering Design Based on Simulated Real Fire Exposure,"
- O. Peterson i
e IAEA-TECDOC-524, Report of a Technical Committee Meeting i Organized by the International Atomic Energy Agency, January 27-31, 1986, " Status, Experience and Future Prospects for
- development of Probabilistic Safety Criteria" i
e Reliability Engineering and System Safety, Draf t paper, "On the Proper Formulation of Safety Goals and Assessment of Safety Margins for Rare and High-Consequence Hazards," T.
l Theofanous e Draft paper for International Conference on Probabilistic
. Safety Assessment and Management, June 24-28, 1996, " Turbine Driven Pump Surveillances,'What Do We Learn?'" B. Christie I
i e Draft paper for International Topical Meeting on 4
Probabilistic Safety Assessment, September 29 - October 3, 1996, " Call to Action: Pilot Programs for Performance-Based l regulation," B. Christie 1
! e Draft paper for International Topical Meeting on Probabilistic Safety Assessment," September 29 - October 3,
, 1996, "What Will Performance-Based Regulation Look Like?" B.
Christie and E. Ballon f Presentation Slides The presentation slides and handouts used during this meeting are
- attached to the office copy of these minutes.
i Note: Additional details of this meeting can be obtained from 4 a transcript of this meeting available in the NRC j Public Document Room, 2120 L Street, N.W. Washingcon-j D.C. 20006, (202) 634-3274, or can be purchased from j Neal R. Gross & Co., Inc. Court reporters and Transcribers, 1323 Rhode Island Avenue, N.W.
Washington, D.C. 20005, (202) 234-4433.
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