1. Update of LeTrench project December 2017
Tim Payne – Australian Nuclear Science and Technology Organisation

2. LeTrench project addresses this topic
Rationale: The topic of Legacy Trenches has been given relatively little attention by existing international projects and networks.
No international consensus on disposal of radioactive waste at the time of operations
Numerous sites exist worldwide
Shallow burial was a commonly used method, particularly in 1950’s and 1960’s (often without engineered containment) .
Used for disposing of low-level wastes, sometimes liquids
Often involved complex and poorly characterised mixtures of wastes, and miscellaneous objects
May pose current or future risks to members of the public and/or the environment.
LeTrench project addresses this topic

3. Legacy trenches exist in many countriesUK
Australia
Canada

4. Le Trench (legacy trench) working group
( a project within IAEA Environet Network)
Activities and objectives
collecting experiences of legacy sites around the world
encouraging preservation of relevant information
identifying and addressing common issues
developing methods of disseminating knowledge
provision of technical assistance or advice
maintaining relevant expertise
Outcome: A report on this topic is in preparation

5. Sellafield Legacy Trench meeting
(September 2016)

6. Kiev Legacy Trench meeting
May 2017

7. Trench facilities in the exclusion zone

8. Kiev workshop participants

9. Upcoming LeTrench Report
“Evaluation, Management and Remediation of Radioactive Waste Legacy Trench Sites”
1. Introductory
2. Global context
3. Inventory
4. Decision making / end state
5. Regulatory
6. Characterisation
7. Modelling
8. Remediation technologies
9. Stakeholder interactions
10. Knowledge management
11. Summary and conclusions
Case studies

10. New participants will be welcome!
Thanks:
IAEA (particularly Horst)
Hosts of LeTrench Workshops (Julian, Dmitri)
Editorial committee (Susan, Peter, Dmitri)
Members of LeTrench project
Environet participants
New participants will be welcome!
“Alone we can do so little; together we can do so much”
[Helen Keller]