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Insert image hereIn September 2012, a Technical Meeting was held at the IAEA headquarters to discuss Human Intrusion (HI) and Future Human Actions in relation to Disposal of Radioactive Waste. As a result of these discussions, a new international project was launched: "HIDRA - Human Intrusion in the context of Disposal of Radioactive Waste". Phase I of the project, which described concepts and a general approach for considering inadvertent human intrusion (IHI) during the lifecycle for a disposal facility, was completed in 2015.
Phase II was established to test practical applications of the concepts and approach developed during Phase I. The first plenary meeting for Phase II of the project was held in January 2016 and the second plenary meeting was held in January 2017. The third and final plenary meeting for Phase 2 is scheduled for 14-18 May 2018.


The objectives of Phase II the HIDRA project are:

  • To share experience and practical considerations for development and regulatory control of activities to consider potential IHI during development of the safety case
  • Develop hypothetical working examples to test and illustrate practical application of the approaches identified in the HIDRA project and identify changes and refinements to the HIDRA approaches
  • As applicable, provide recommendations to WASSC for future updates of safety standards.

Outcome from Phase II

The project aims to develop a report with examples and recommendations regarding the consideration of IHI as part of development of the safety case and decision-making.  Emphasis will be placed on: (1) communication of IHI within the safety case, and (2) identification of measures to reduce the potential for and/or the consequences of IHI within the context of an optimization process.
Two Working Groups (WG) were established addressing examples for near-surface and geological disposal, respectively. The co-chairs and working group leads are responsible for integration of the products from the working group activities and preparation of the final report. Development or refinement of existing country-specific examples will be encouraged for both working groups. Each working group will also review input related to IHI in the current Safety Standards in order to propose clarifications or suggestions for changes when the documents are updated.
When developing working examples, the following topics will be addressed by the Working Groups:

  • Consideration of IHI within the PRISM/PRISMA decision-making process and safety case considerations
  • Development of the regulatory framework to address IHI (e.g., prescriptive/flexible, criteria, quantitative/qualitative)
  • Effective approaches for communication and consultation related to IHI at different steps in the lifecycle
  • Customization of the representative scenarios from Phase I of HIDRA for a hypothetical facility
  • Use of the measures database from Phase I of HIDRA to identify measures for a specific facility and associated customization of IHI scenarios for the hypothetical facility as applicable
  • Practical implementation of optimisation to reduce the potential for and/or consequences of IHI using the representative scenarios and measures developed for the hypothetical examples
  • Role of passive/in-direct controls/oversight to determine timing of IHI (consideration of ICRP and IAEA terminology)
  • Identification of potential recommendations for WASSC for clarification or updates to Safety Standards.

The two to three year project is planned to include three plenary meetings as well as individual task group meetings as needed. Each plenary meeting will play a pivotal role in presenting and discussing the scope, content and outcome of the project. Individual task meetings were held between plenary meetings to review the progress of specific task activities, and to plan subsequent activities.

First Plenary Meeting

The first plenary meeting of Phase II of HIDRA was held in January 2016. The meeting included a review of the concepts and guidance developed during Phase I and refinement of plans for Phase II. The first day also included an overview of current IAEA activities and a general introduction to the HIDRA project. Topical presentations were also provided on OECD/NEA activities and for the IAEA PRISMA project. Potential topics for Phase II were then discussed in detail.
Working groups and leads were identified and a general plan was developed for project implementation. Plenary discussions during the week addressed integration questions and sharing of plans for the two working groups. Country-specific topical presentations were also provided during the plenary sessions.
The independent WG sessions during the week focused on further development of the plans for the working groups and efforts to begin development of material for inclusion in the project report.
Prior to the conclusion of the meeting, a plenary discussion was held to confirm the Terms of Reference for the project. The final plenary session for the week included summaries from the WG leads and a closing presentation from the Chair. The presentations addressed the current status and path forward for the project activities.


Second Plenary Meeting

The second plenary meeting for Phase II of the HIDRA project was held in January 2017. Core group members (Chairpersons and WG leads) presented the current status of WG activities. The opening presentations emphasized the status of the chapters for the HIDRA Phase II report and plans for the week. Summaries of IAEA and OECD/NEA activities were also provided, respectively.   
Plenary discussions during the week focused on integration of the Working Group activities and group positions regarding a number of key technical topics that were identified. The two WGs worked independently for the majority of the week to continue development of their contributions to the project report.
Prior to the conclusion of the meeting progress was reported from each WG lead and the Chair provided a closing summary including specific suggestions to address technical issues/topics identified to date. The presentations also outlined plans for work prior to the next plenary meeting.


The presentations made during the second Technical Meeting could be found at in the folder WES Downloads/HIDRA 2017 TM. To get access to the IAEA share point, please contact with the HIDRA Chairperson Mr. Roger Seitz or scientific secretary of the project Mr. Andrey Guskov.

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| Last update: Wednesday, 31 May, 2017.