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ACQUISITION OF SUBJECTIVE DATA FOR USE IN MODELS FOR WASTE SITE ASSESSMENTS

Objective

IN THE MODELLING OF RADIONUCLIDE MOVEMENT FROM A REPOSITORY, A COMPROMISE MUST BE ACHIEVED BETWEEN ACCURACY AND COST. FOR PROBABILISTIC SITE ASSESSMENT USING MONTE CARLO SIMULATION, ONE DIMENSIONAL MODELS ARE USED DUE TO THEIR SMALL COMPUTATIONAL COST WHEREAS FOR DETERMINISTIC MODELLING MORE DETAILED TWO- AND THREE-DIMENSIONAL MODELS ARE USED. THE OBJECTIVES OF THIS PROGRAMME OF WORK ARE TO DEVELOP AND DEMONSTRATE CONSISTENT DATA ACQUISITION AND PREPARATION TECHNIQUES FOR PROBABILISTIC SITE ASSESSMENT AND FOR DETAILED DETERMINISTIC MODELLING OF RADIONUCLIDE MOVEMENT FROM A REPOSITORY FOR INTERMEDIATE LEVEL WASTE UNDER THE HARWELL SITE/.A COMPARISON OF RADIONUCLIDE RISKS DERIVED FROM BOTH ASSESSMENT PROCEDURES WILL BE MADE AND ANY INCONSISTENCIES IN THE INPUT DATA AND RESULTING INCONSISTENCIES IN THE RISK ESTIMATES WILL BE INVESTIGATED.
The objectives of the work were as follows:
to develop and demonstrate consistent data acquisition and preparation procedures for probabilistic risk assessment, and for detailed deterministic modelling, of radionuclide movement from a hypothetical repository for intermediate level waste;
to carry out a comparison of the results derived from both assessment procedures;
to qualify any inconsistencies in input data;
to investigate the reasons for any inconsistencies in the model results.
B1. RESEARCH PROGRAMME : DEVELOPMENT OF METHODOLOGY FOR COMPARING PROBABILISTIC SITE ASSESSMENT CODES AND DETAILED DETERMINISTIC MODELS; PLANNING FOR THE DATA ACQUISITION EXERCISE.

B2. DATA ACQUISITION : THE USE OF EXPERT OPINION TO ACQUIRE DATA FOR 5 TO 10 PARAMETERS.

B3. MODEL COMPARISON : COMPARISON OF INPUT DATA AND EXPECTED RISKS.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Principia Mechanica Ltd
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