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Summary from TM-55074 Second Meeting of the Second Phase of the
International Project on Human Intrusion in the Context of Disposal of
Radioactive Waste
23-27 January 2017
Documents provided / developed during the meeting are available from
https://share.iaea.org
Presentations
A. Orrell (IAEA) welcomed the participants and opened the meeting with a
presentation about oil drilling near the WIPP repository in the United States. The
presentation highlighted the potential for inadvertent human intrusion (IHI) in
areas where there are natural resources.
R. Seitz (Chair) provided an overview of the HIDRA Project and the Working Group
leads (T. Hjerpe and R. McLeod) summarized the status of work to date. L. Bailey
(Co-Chair) gave a presentation on activities related to the safety case at the
OECD/NEA. R. Seitz reviewed the Terms of Reference and introduced a number of
topical questions and issues that have been identified. R. McLeod provided a
presentation on interpretation of “Isolation” for inadvertent human intrusion.
Country presentations were provided by Y. Severe and M. Gallerand from France
highlighting the approach for IHI and challenges with modelling radon exposure,
respectively. I. Lazar also provided a presentation on the approach applied for IHI
in Hungary.
Topical Questions and Issues
A number of topical questions and issues were identified and discussed during the
week:
• “Isolation” in the context of IHI
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• Concept of “Stylised Scenarios”
• Distinction between inadvertent and deliberate intrusion
• Quantitative or qualitative approaches to address IHI
• Prescriptive or non-prescriptive regulatory approaches (extent of
stylization in regulations)
• Worst case, best estimate, random - basis of appropriate
assumptions for IHI scenarios
• Role of IHI during the siting phase
• Consideration of water use in IHI scenarios
• Regulatory approach for addressing radon in requirements (e.g.
distinguishing between naturally-occurring radon, include or not
include radon in all pathways dose)
• Appropriate consideration of non-radioactive hazards for IHI
• Considerations for software and models
Each of these topics is being considered by the Working Groups.
Status
The working groups started developing input for the report prior to the meeting.
It was decided that the detailed working group reports would be included as
Annexes to the report. A standard format will be developed for a summary of the
working group efforts to be included within the body of the report. During the
week, the working group efforts focused on applying the HIDRA methods for the
hypothetical disposal facilities previously developed by each working group.
A first rough draft of the HIDRA II report was prepared during the week by the
Chair and Co-Chair to illustrate the structure of the report. Initial text was
developed for the early chapters and bullet lists were prepared for discussions of
the topical questions and issues. The draft report was shared with the participants
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on Friday morning. The initial ideas for the topical questions and issues were
discussed in the closing session on Friday and a number of suggestions were
provided by the participants. These suggestions are not yet reflected in the draft
text and will be developed over the coming months.
Path Forward
At the Friday closing plenary, the HIDRA Chair and WG leads presented the
summary of the activities conducted during the week. The work plans were also
discussed. The draft national examples prepared for HIDRA were discussed and
L. Bailey and C. Barr will review them and propose a path forward for finalising
them for inclusion with the HIDRA II report.
Both working groups have committed to some form of calculations to support
practical implementation of the HIDRA methodology. The calculations for the
near-surface working group are expected to play a more significant role in the
process. Each working group made specific assignments for participant
contributions to the report.
Overall Project Schedule
• Propose path forward for use of Country Examples in project report –
L. Bailey, C. Barr (End of February)
• Participants provide feedback on bullet lists for Chapter 7, Topical
questions and issues – All Participants (End of March)
• First draft of text for Chapter 7 available for review – R. Seitz, L. Bailey (End
of June)
• Working group meetings/discussions – July/August
• Participants provide feedback on Chapter 7 – All Participants (Early August)
• Updated draft text for detailed Working Group Reports – WG Leads
(August)
• Geological Working Group meeting (September)
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• Co-Chairs and WG Leads meeting (Autumn/Winter 2017)
• Updated draft text for HIDRA II report – R. Seitz, L. Bailey (January 2018)
• Third Plenary Meeting (Tentative 29 Jan – 2 Feb 2018 or May 2018?)
Working Group Assignments
Near-Surface Working Group (initial drafts by end of March 2017, final inputs by
end of June)
• Complete section 8.4.5: Measures/optimisation: for case 1 and 2a (in excel
sheet 2b) include description of the approach (Radosveta)
• Restructure report and share for comment (RMcL)
• Example calculations at an appropriate level of detail (Yan, Cyn, Tak)
• Chemical toxicity (examples from different countries: France Yan & Marie;
• Societal Factors: (Stela, Julie)
• Timing of institutional control. Different opinions in different countries. UK
(300), USA (100), France (300 near surface, 500 deep geological), JPN (300)
KOR (100 Silo / above ground 300)
• Upload Document to Cloud: (RMcL)- inc. HIDRA I, Working group materials.
• Email this presentation and the marked up Ch 8 extract from HIDRA I
(RMcL)
• Calculation for Case 2 Drilling (Iuliia)
• How do we use the results from any calculations and does way we present
the result depend on the audience (dose/concentration/relative
indicators)? (Marie/Amelie)
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Geologic Working Group (Complete by August)
• Perform initial calculations, drilling scenario (Thomas H)
• Restructure the WG report (Thomas H + all)
• Suggestion for updated regulatory guidelines (Thomas B)
• Prepare for the discussion at the WG meeting (all)
• Relative probabilities, footprints (Shizhong)
• Calculations/compartments, Nagra (Jens)
• ST1/deepheat in English (Jarkko)
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