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Conference Article: Results from plate-out investigations

Iniotakis, N.; Malinowski, J.; Gottaut, H.; Muenchow, K. (Kernforschungsanlage Juelich G.m.b.H. (Germany, F.R.))

Abstract

The fission- and activation products in the primary circuits of HTR's belong to the essential factors for the security of the plant during the normal work and in the case of accident. The deposition of these products on the components of primary circuits, specially their diffusion in the wall material, can cause a more or less intense contamination of the components and play a decisive role in the solving of such problems as inspection, servicing and repair. The knowledge of fission product [FP] behaviour in the primary circuit of a HTR is an essential requirement for the estimations of the availability of the reactor plant in normal operation, of the hazards to personnel during inspection and repair and of the potential danger to the environment from severe accidents. In the Institute for Reactor Components of the KFA Juelich, much theoretical and experimental work was done, with the aim to clarify this complex problem. In this paper we would like to report some essential results of these investigations with special attention to the possibility of extrapolation of these results for long periods of time.

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key words: contamination; diffusion; experimental data; fission products; htgr type reactors; kernforschungsanlage juelich; mathematical models; primary coolant circuits; radionuclide migration; testing; theoretical data; cooling systems; data; gas cooled reactors; graphite moderated reactors; national organizations; numerical data; radioactive materials; reactor components; reactor cooling systems; reactors
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:35-43