Modelling the chemical behaviour of tellurium species in the reactor pressure vessel and the reactor cooling system under severe accident conditions
This report contains information on the behaviour of tellurium and its compounds in a reactor pressure vessel and reactor coolant system under light water reactor severe accident conditions. To characterise tellurium behaviour, knowledge of the species of tellurium released from the core, and the simultaneity of its release with that of other materials is necessary. Release and transport experiments are reviewed, along with the models implemented in the codes used by the international community: TRAPMELT, RAFT, VICTORIA and SOPHIE. It can be concluded from the experiments that species other than Te(2), such as tin telluride and caesium telluride, may be released from the fuel, which is why they must be considered in the transport phenomena. There is also experimental evidence of the strong interaction of Te(2) with Inconel 600 and stainless steel in the pipe walls and structures. However, this strong interaction is in competition with the interaction of tellurium with aerosols, which under severe accident conditions may represent an area greater than that of the primary system.
Bibliographic Reference: EUR 13787 EN (1991) 92 pp., FS, ECU 7.50
ISBN: ISBN 92-826-2855-8
Record Number: 199210287 / Last updated on: 1994-12-02
Original language: en
Available languages: en