Baldwin TD and Hicks TW, Assessment Calculations for Human ...

0977-6Version 14 Model VerificationImplementation of the GoldSim EDA human intrusion model has been subjected tocomprehensive and systematic verification checks as discussed below. Version 1.2 ofthe GoldSim EDA human intrusion model was used to produce the results presentedin Section 6.4.1 GoldSim Software Validation and VerificationThe pedigree of the GoldSim software is evident based on its development and useover a period of almost 20 years (see www.GoldSim.com). GoldSim has been usedby and/or for a diverse set of customers and clients, including government agencies inover 10 countries (such as the US Department of Energy, NASA, the NuclearRegulatory Commission, and the California Department of Water Resources),research laboratories (including Sandia National Laboratories, Los Alamos NationalLaboratory, the Paul Scherrer Institute, and MIT), and commercial organisationsworldwide.Released versions of GoldSim are verified by the code developers. Duringverification, many test problems are executed and the results compared to expectedvalues.4.2 Verification of the Human Intrusion Model in GoldSimThe implementation of the human intrusion model in GoldSim was verified by Hicksand Baldwin (2011). This verification process included:• Checking the implementation of radionuclide decay chains.• Checking the implementation of the dose expressions for each humanintrusion event by comparison with results obtained by implementing the sameequations in a Microsoft Excel spreadsheet.• Checking that the results reflected expectations of the magnitude and spatialand temporal variability of calculated dose based on understandings of thetrench and vault inventories and exposure pathway parameters (‘sense’checks).This study of the additional vaults has involved assessment of the same types ofhuman intrusion event as those assessed for the RDA, and the same radionuclidedependentdata have been used. Therefore, it was considered unnecessary toundertake further verification tests of the implementation of the radionuclide decayequations and the dose expressions. However, checks were carried out to ensure thatGalson Sciences Ltd 11 21 March 2011