Community Research and Development Information Service - CORDIS


In this report, a synthesis of the main results obtained by the coordinated cluster of HTR projects of the Euratom 5th Framework Programme (FP5) is presented and the prospects for industrial application of these results are assessed. The objective of the cluster for FP5 was to retrieve, master and develop the technologies developed in the past HTR European activities and to assess key feasibility issues of modern modular direct cycle HTRs.
The main results concern:
- The improvement of reactor physics modelling of HTR cores and the validation of the improved methods by benchmarking with relevant experimental data,
- The fabrication process for kernels and coating layers of TRISO fuel particles, the behaviour of these particles under normal irradiation conditions and in accident conditions (including the development of test facilities for that purpose and of techniques for on line monitoring of fission gas releases) and the modelling of the behaviour of these particles under irradiation (fission product release, failure probability),
- The identification and the validation in HTR operating conditions of appropriate materials for the vessel, the helium turbine of a direct cycle HTR and the internal structures,
- The feasibility of the key components and systems of this type of reactor (the turbine with its magnetic bearings, the recuperator, the helium purification system),
- A preliminary assessment of the waste production of HTRs and of the behaviour of irradiated HTR fuel in disposal conditions and the laboratory scale development of a process for decontamination of irradiated graphite,
- The development of a safety approach meant at an optimal application of the general safety goals used for designing any nuclear system taking into account the very unique inherent safety features of modular HTRs.

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