Summary for WG2 – Reference approaches to modelling for management and remediation of NORM and legacy sites Astrid Liland, NRPA, Norway, WG2 Leader EMRAS II meeting, Vienna HQ 24-28 January 2011
Work performed last year 1. Presentations of NORM and legacy sites in various countries, e.g. NORM solid waste distribution in China coal 29.42% coal gangue aluminum 2.17% 2.95% vanadium 1.23% phosphate others 4.62% 4.48% rare-earth 0.86% iron zircon 44.47% 0.04% niobium/ tantalum tin 0.05% 2.03% lead/zinc copper 1.22% 6.48% 2. Discussions on modelling and regulatory challenges 2
3. Gela - phospogypsum stack disposal site – Modelling with e.g. ReCLAIM and RESRAD, both for the present situation and for future scenarios – Comparing to criteria, both the 1000 Bq/kg clearance level for natural decay chains material and dose criteria of 0.3 – 1 mSv/y – Clear that Gela cannot be released for unrestricted use and the phosphogypsum cannot be reused (e.g. for building roads) due to both radiological and other pollutants present 3
4. General Assessment Methodology Process (GAMP) development • Guidance document on how to use models for assessing the radiological impact of NORM and legacy sites • Valuable input from many countries and different disiplins (modellers, regulators, technical advisors) • Draft version tested for various types of sites 4
4b. Testing the draft General Assessment Methodology Process The draft GAMP was tested for real sites in: • Australia (nuclear weapons testing) • Belgium (phosphate industry, radium extraction and production of sources) • Brazil (monazite ore processing) • Italy (phosphogypsum stack) • Norway (former rare earth metals mining site) 5
Identify the problem Stakeholder Actions to be taken See expanded diagrams Investigate and Decision maker in subsequent figures characterise the site Measurements General steps Define objectives Decisions (not necessarily radiological) Decision maker Establish screening Communication criteria Stakeholder Screening assessment Stakeholder yes Screening Decision maker criteria satisfied? no More realistic assessment yes Screening criteria satisfied? no Detailed assessment yes Screening criteria satisfied? no Decision maker Establish cleanup criteria Remedial action Stakeholder Stakeholder 6 yes Cleanup criteria Decision maker ti fi d?
Interim meeting in France 2010 • Facilitated by IRSN and AREVA • Former uranium mining and milling sites in the Limousin region • Presentation of the pre remediation situation as well as the current status • All available monitoring data shared with the group • 19 participants from 15 countries, all continents represented 7
Industrial Site of Bessines in 1978 tailings ore stockpile mining waste processing plant extraction shaft mining waste Gartempe river Brugeaud open pit 8 AREVA
Industrial Site of Bessines in 2010 Industrial Site mining waste covering the tailing storage: Lavaugrasse water treatment plant Gartempe river mining waste covering the tailing storage: Brugeaud open pit 9 AREVA
10 Bellezane Open-Pit Mine (in operation) 1992 AREVA
11 2001 Bellezane Open-Pit Mine (Reclaimed) AREVA
Plans for this week • Discuss modelling experience with the Gela and Bellezane sites • Added features of the RESRAD-OFFSITE code • Links between Regulatory Objectives, Assessment Methods and Scientific Support and link to the IAEA’s International Working Forum for Regulatory Supervision of Legacy Sites • Discuss the role of guideline levels • Final discussions on draft GAMP and plan for finalization • Interim meeting venue – suggestions from Argentina, Belgium, Bulgaria, China, USA, possibly more • Contents and structure of final report to be decided • Action plan for 2011 to de decided 12
”International Conference on Radioecology and Environmental Radioactivity” in June 2011 in Hamilton, Canada The IAEA Environmental Modelling for Radiation Safety programme (EMRAS II) – new working group on “Reference approaches to modelling for management and remediation at NORM and legacy sites” A. Liland1, R. Avila2, J. Brown1, J.C.M Cañadas3, D. da Costa Lauria4, T. Doursout5, K. Ivanova6, V. Koukoulio7, L. Magro8, B. Michalik9, C. Nuccetelli10, R. O’Brien11, S. Pepin12, C. Potiriadis13, G. Pröhl7, L. Setlow14, G. Smith15, B. Smodis16, M. Sneve1, L. Sweeck17 , A. Tkaczyk18, B. Varga19, D. de Villiers20, S. Walker14, Q. Wu21, C. Yu22 • Oral presentation of the group and its work so far • www.ecorad2011.net 13
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