Abstract
The helium engineering demonstration loop (HENDEL) at Japan Atomic Energy Research Institute is so designed as a large-scale model test facility for the demonstrative operation of hightemperature components for the experimental very high-temperature gas-cooled reactor (VHTR). It required 5yr for the design and construction and its initial operation was begun in February 1982, and full power was reached at the middle of March of the same year. Here full power corresponds to the operation of the facility at the maximum helium gas temperature of 1, 000°C.This report describes the general outline of the HENDEL and mentions technical problems with the loop systems and components under helium and high-temperature conditions.
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