Fir 1 TRIGA activity inventories for decommissioning planning

Antti Räty; Petri Kotiluoto

doi:10.13182/NT15-86

Fir 1 TRIGA activity inventories for decommissioning planning

Antti Räty, Petri Kotiluoto

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

Abstract

The objective of the study has been to estimate the residual activity in the decommissioning waste of the TRIGA Mark II-type research reactor FiR 1 in Finland. Neutron flux distributions were calculated with the Monte Carlo code MCNP. These were used in the ORIGEN-S point-depletion code to calculate the neutron-induced activity of materials at different time points by modeling irradiation history and radioactive decay. Knowledge of the radioactive inventory of irradiated materials is important in the planning of the decommissioning activities and is essential for predicting the radiological impact to personnel and the environment. Decommissioning waste consists mainly of ordinary concrete, aluminum, steel, and graphite parts. Results include uncertainties due to assump-tions on material compositions and lack of some detailed operational history data. Comparison to activity inventory estimates of two other decommissioned research reactors is also presented.

Original language	English
Pages (from-to)	28-38
Journal	Nuclear Technology
Volume	194
Issue number	1
DOIs	https://doi.org/10.13182/NT15-86
Publication status	Published - 2016
MoE publication type	A1 Journal article-refereed

Keywords

activity inventory
decommissioning
Triga research reactor

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