1 / 8

Assessment tools

Assessment tools. A number of ‘approaches’ documented & available and being used/developed in-house e.g. 15 models/approaches participated within the IAEA EMRAS Biota Working group (although ranged from dose or transfer models through to more complete assessment tools). Assessment tools.

glenna
Download Presentation

Assessment tools

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Assessment tools • A number of ‘approaches’ documented & available and being used/developed in-house • e.g. 15 models/approaches participated within the IAEA EMRAS Biota Working group (although ranged from dose or transfer models through to more complete assessment tools)

  2. Assessment tools • Software for some tools freely available • including RESRAD-Biota (implementation of USDOE Graded Approach); ERICA Tool; England & Wales EA R&D128 • Many approaches use a tiered assessment structure (in common with other areas of risk assessments) • simple initial screening through to more refined assessments

  3. Initial screening tier: Tier 1 • Designed to be simple and conservative • User only needs to input media activity concentrations • Aim - to enable sites of negligible concern to be identified and removed from need for further assessment – with a high degree of confidence • Envisaged that most sites will only need this level of assessment [i.e. ‘be screened out’]

  4. Tier 1 • Media concentrations are compared to predefined concentrations (EMCLs or BCGs) = concentration giving rise to screening dose rate (to most limiting organism)

  5. Tier 1 – conservative • Maximum measured or modelled media activity concentrations advised as input • Transfer parameters used to derive EMCL/BCG are maximums or 95th percentiles • Habitat assumptions (e.g. RESRAD-Biota terrestrial animal surrounded by soil) • Dose conversion coefficients (RESRAD-Biota) progeny with half-lives <100 year included; external exposure organism assumed to be very small; internal exposure organisms assumed to be large)

  6. Higher tier assessments USDOE graded approach Use same dose rate

  7. Higher tier assessments ERICA

  8. Regulatory action level(s) RQ>1 Taxonomic screening levels Taxonomic screening levels RQ>1 Generic screening level PROTECT benchmarks & tiered assessments Highest level tier (risk characterisation) PROTECT benchmarks Middle level tiers (site specific/user defined inputs) Initial screening tier (highly conservative) Assessment frameworks

More Related