The Multi-Step CADIS method for shutdown dose rate calculations and uncertainty propagation
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Shutdown dose rate (SDDR) analysis requires (a) a neutron transport calculation to estimate neutron flux fields, (b) an activation calculation to compute radionuclide inventories and associated photon sources, and (c) a photon transport calculation to estimate final SDDR. In some applications, accurate full-scale Monte Carlo (MC) SDDR simulations are needed for very large systems with massive amounts of shielding materials. However, these simulations are impractical because calculation of space- and energy-dependent neutron fluxes throughout the structural materials is needed to estimate distribution of radioisotopes causing the SDDR. Biasing the neutron MC calculation using an importance function is not simple because it is difficult to explicitly express the response function, which depends on subsequent computational steps. Furthermore, the typical SDDR calculations do not consider how uncertainties in MC neutron calculation impact SDDR uncertainty, even though MC neutron calculation uncertainties usually dominate SDDR uncertainty.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1245347
- Journal Information:
- Nuclear Technology, Vol. 192, Issue 3; ISSN 0029-5450
- Publisher:
- American Nuclear Society (ANS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Review of Hybrid (Deterministic/Monte Carlo) Radiation Transport Methods, Codes, and Applications at Oak Ridge National Laboratory
|
journal | January 2011 |
Development of a General Method of Explicit Solution to the Nuclide Chain Equations forDigital Machine Calculations (thesis) | report | October 1962 |
Validation of the MS-CADIS Method for Full-Scale Shutdown Dose Rate Analysis
|
journal | August 2018 |
Assessment of Activation on Level L3 of the Tokamak Building due to the ITER Tokamak Cooling Water System
|
journal | May 2019 |
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