ACNW MEETING WITH THE U.S. NUCLEAR REGULATORY COMMISSION George - - PowerPoint PPT Presentation

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ACNW MEETING WITH THE U.S. NUCLEAR REGULATORY COMMISSION George - - PowerPoint PPT Presentation

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ACNW MEETING WITH THE U.S. NUCLEAR REGULATORY COMMISSION George M. Hornberger December 18, 2002 1 RECENT ACHIEVEMENTS Reviews of Priority High-Level Waste Issues 10 CFR Part 63 Amendments and Yucca Mountain Review Plan Key

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ACNW MEETING WITH THE U.S. NUCLEAR REGULATORY COMMISSION

George M. Hornberger December 18, 2002

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RECENT ACHIEVEMENTS

Reviews of Priority High-Level Waste

  • Issues

10 CFR Part 63 Amendments and – Yucca Mountain Review Plan Key Technical Issue Resolution – Waste-Related Research – Public Outreach Meeting

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RECENT ACHIEVEMENTS

(CONT’D) International Activities

  • Quadripartite Meeting in Europe

– Swedish Waste Management – Facilities Visit

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OTHER AREAS OF INTEREST

Spent Fuel Transportation

  • Orphan Sources
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TODAY’S TOPICS

HLW Risk-Insights Initiative

  • Yucca Mountain Review Plan
  • Spent Fuel Transportation
  • Igneous Activity
  • Container Life and Source Term KTI
  • Update
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HIGH-LEVEL WASTE RISK INSIGHTS INITIATIVE

  • B. John Garrick
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WHAT ARE RISK INSIGHTS?

Commission White Paper

  • “…Refers to the Results and Findings

that Come From Risk Assessments.”

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WHAT ARE RISK INSIGHTS?

(CONT’D)

  • Risk Insights Initiative

“Information that is (1) Based on DOE’s Safety Case, (2) Linked To Part 63 Requirements, and (3) Based on Performance Assessments.”

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REASONS FOR RISK INSIGHTS INITIATIVE

Document Risk Insights and the Tie to

  • Resolution of the Agreements

Reduce Regulatory Burden

  • Improve Communication & Integration
  • Implement Risk Insights Into Issue
  • Resolution Process
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RISK INSIGHTS: OBSERVATIONS

Excellent Interaction between KTI

  • and Performance Assessment Teams

Absence of Visible “Risk

  • Assessments” in the Results
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OBSERVATIONS

(CONT’D) Not a Risk-Ranking Exercise

  • Composite Rating Process Lacked
  • Rigor - Qualitative Not Quantitative
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CONCLUSIONS

Successful for Internal

  • Communication and Documentation

Diminished the Role of Risk

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RECOMMENDATIONS

Repeat the Exercise Adopting the

  • Interpretation of the White Paper on

the Meaning of Risk Insights Results of the Performance

  • Assessment Should be a Factor in

Prioritizing Agreements

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YUCCA MOUNTAIN REVIEW PLAN George M. Hornberger

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Began Interactions with Staff Early

  • Informal Comments on the First Draft
  • Iterative Sessions with Staff as YMRP
  • Developed

REVIEW PROCESS

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ACNW: YMRP is Risk-Informed, but Very Repetitive and Voluminous. Use Tables, Charts, Graphics to Improve Staff: Will Look for Opportunities to Economize on Repetition and Length

COMMENT 1

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ACNW: Use Appendix With a Review Illustration To Ensure Risk- Perspective Staff: An Example Would Be Useful, But Must Avoid Impression Staff Has Reached a Licensing Decision

COMMENT 2

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ACNW: Depth of Review Should Be Based on Staff’s Own Risk-Insights Staff: Will Build Its Own Risk Insights

COMMENT 3

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ACNW: Review Guidance Carried Over From Reactor Reviews for Relevance to Waste Disposal Staff: Will Ensure Review Areas are Appropriate for HLW

COMMENT 4

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FUTURE ACTIONS

Watch the Process as KTIs are

  • Folded into the YMRP’s Integrated

Subissues Review the Integrated Issue

  • Resolution Status Report
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FUTURE ACTIONS

(CONT’D) Continued Focus on Select KTIs

  • –

Focus on Risk-Informed Resolution of KTIs – Total System Performance Assessment and Integration and CLST KTIs

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SPENT FUEL TRANSPORTATION

Milt Levenson

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TRANSPORTATION WORKSHOP GOALS

Acquire Information on…

  • Performance of Spent Fuel

– Transportation Packages Transportation Experience –

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HIGHLIGHTS FROM WORKSHOP

No In-service Failures of Spent Fuel

  • Transportation Packages

Designers and Analysts are Confident That

  • Current Analysis and Testing Methods Are

Sufficient Designers and Analysts Prefer Multiple

  • Scale Model Tests to a Single Full Scale

Model Test

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DRAFT TEST PROTOCOLS

After Reviewing the PPS, the ACNW

  • Recommended Use of Realistic

Testing Protocol Following the Workshop, We Believe

  • that the Technical Basis for this

Recommendation is Even Stronger

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IGNEOUS ACTIVITY

George M. Hornberger

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BACKGROUND

Igneous Activity

  • Low-Probability, High-

– Consequence Event Issues

  • Probability of Disruption

– Magma Interaction with – Canisters

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PROBABILITY

Current DOE Probability Estimates

  • Based on Expert Elicitation

– Probabilistic Volcanic Hazards – Analysis New USGS Data May Influence DOE

  • Estimates

Previously Undetected – Aeromagnetic Anomalies Different Scientific Interpretations – Concerning New Data

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CONSEQUENCES

Potential Effects of Volcanism on

  • Repository

Complex Physical Phenomena – Shock-Wave Theory Introduced –

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CONSEQUENCES

(CONT’D)

  • NWTRB Review in 2002

– Critical of Shock-Wave Model – Overly Conservative

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ACNW ACTIONS

Responding to March 2002

  • Commission Request

June 2002 ACNW Working Group

  • Invited NWTRB Experts

– Independent ACNW Experts – Consequence Issues –

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ACNW WORKING GROUP FINDINGS

Probability

  • Probability Estimates Not Likely to

– Change Significantly Still Incumbent on DOE to Examine – New USGS Data in Context of PVHA

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ACNW WORKING GROUP FINDINGS

(CONT’D) Consequences

  • Volcanic System in Southern

– Nevada Not Capable of Producing Shock-Wave Effects Improved Consequence Models – Needed

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ACNW REPORT

Range of DOE-Estimated

  • Probabilities Reasonable

Shock-Wave Analysis Too Idealized

  • to be of Direct Use

KTI Agreements Provide Reasonable

  • Basis for Evaluation of License

Application

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CONTAINER LIFE AND SOURCE-TERM KTI UPDATE Raymond G. Wymer

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ISSUES

Quantity & Chemistry of Water

  • Contacting Waste Packages

Corrosion & Mechanical Disruption of

  • Waste Packages

Radionuclide Release Rates &

  • Solubility Limits
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PERFORMANCE CONFIRMATION

Continued Long-Term Tests of Waste

  • Package Materials Can Provide

Additional Confidence in the Technical Basis for Decisionmaking

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OBSERVATIONS

New DOE Performance Confirmation

  • Program is Expected to Address

CLST Issues Underground Drifts for Performance

  • Confirmation Will Probably Include

Testing of Waste Package Materials

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RECOMMENDATIONS

CLST Agreements Should be

  • Prioritized Based on Importance to

Risk Continue to Incorporate Simplified

  • Models Wherever Practical to

Enhance Risk Communication

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SUMMARY

George M. Hornberger

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NEAR-TERM ACTIVITIES

Continue to Focus on Priority Issues

  • Identified in Action Plan

Working Groups

  • Performance Assessment

– Performance Confirmation –

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LONG-TERM ACTIVITIES

Support Commission With

  • Independent Review of DOE License

Application Undertake Other Review Activities

  • Consistent With the Action Plan
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ABBREVIATIONS

CLST Container Life and Source Term KTI DOE U.S. Department of Energy HLW High-Level Radioactive Waste KTI Key Technical Issue NWTRB U.S. Nuclear Waste Technical Review Board

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ABBREVIATIONS

(CONT’D) PPS Package Performance Study PVHA Probabilistic Volcanic Hazards Analysis Report USGS U.S. Geological Survey YMRP Yucca Mountain Review Plan