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Conference Article: Modelling of plate-out under gas-cooled reactor (GCR) accident conditions

Taig, A.R. (UKAEA Risley Nuclear Power Development Establishment, Culcheth. Safety and Reliability Directorate)

Abstract

The importance of plate-out in mitigating consequences of gas-cooled reactor accidents, and its place in assessing these consequences, are discussed. The data requirements of a plate-out modelling program are discussed, and a brief description is given of parallel work programs on thermal/hydraulic reactor behaviour and fuel modelling, both of which will provide inputs to the plate-out program under development. The representation of a GCR system used in SRD studies is presented, and the equations governing iodine adsorption, desorption and transport round the circuit are derived. The status of SRD's plate-out program is described, and the type of sensitivity studies to be undertaken with the partially-developed computer program in order to identify the most useful lines for future research is discussed.

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key words: computerized simulation; differential equations; fission product release; gas cooled reactors; iodine; primary coolant circuits; radionuclide migration; reactor accidents; accidents; cooling systems; elements; equations; halogens; nonmetals; reactor components; reactor cooling systems; reactors; simulation
Reference:
Specialists meeting on coolant chemistry, plate-out and decontamination in gas-cooled reactors Juelich, Federal Republic of Germany 2-4 December 1980
International Atomic Energy Agency, Vienna (Austria)
IWGGCR--2, pp:87-93