Abstract
In this paper we present a computational exercise for shut-down dose rate calculations for the JET tokamak using the in-house developed JSIR2S code package as part of its validation. The computation is performed in two parts: neutron transport and transport of secondary gamma radiation. In order to calculate neutron activation reaction rates with sufficiently low variance, hybrid variance reduction techniques using the ADVANTG code have been utilized. Probability based sampling of secondary source particles was performed. Calculated gamma dose rates after shut down are compared with dose rate measurements performed on site using ionization chambers. The C/E agreement for 1st octant is between 0.8 to 1 while statistically meaningfull results for the 2nd octant are yet to be obtained.
Highlights
The JSIR2S code package for simulation of radiation due to radioactive decay of neutron activated and fission produced radioactive nuclides has been under development at the ”Jožef Stefan” Institute for the last 2 years
In this paper we present a computational exercise for shut-down dose rate calculations for the JET tokamak using the in-house developed JSIR2S code package as part of its validation
In this paper we present computational analysis and the work flow of shut-down dose rate calculations (SDR) on JET tokamak using the JSIR2S following the the entire operational history, compared to measurements performed in the framework of the Work Package JET3 NEXP [9,10]
Summary
The JSIR2S code package for simulation of radiation due to radioactive decay of neutron activated and fission produced radioactive nuclides has been under development at the ”Jožef Stefan” Institute for the last 2 years It is based on the Rigorous-2-step computational framework (R2S) [1] on a rectangular mesh. Due to irregular shapes being generated by intersection of a superimposed mesh and geometry cells, their volumes are calculated stochastically up to an absolute precision by setting all model materials to vacuum, cell volumes to 1, setting up a source plane with source particles emitted in parallel and calculating the volume averaged particle flux These vales are multiplied by the average ray surface area to calculate cell volumes of computational units. In this paper we present computational analysis and the work flow of shut-down dose rate calculations (SDR) on JET tokamak using the JSIR2S following the the entire operational history, compared to measurements performed in the framework of the Work Package JET3 NEXP [9,10]
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