A high temperature in-pile gas loop OGL-1 has been developed, constructed and operated successfully in the Japan Materials Testing Reactor (JMTR) at the Oarai Research Establishment of Japan Atomic Energy Research Institute. The loop was developed as a testing facility for the future multi-purpose high temperature gas cooled reactor (VHTR), specifically designed to make irradiation tests of its nuclear fuel and graphite under the helium flow condition of 1, 000°C.
Its design and manufacturing had a great number of developmental factors as there was few experience for the systems, components and structures, operating under such high temperature conditions. Thus OGL-1 is not only an irradiation facility but also a pilot plant of VHTR.
After 7 years of many laborlous developments OGL-1 was completed in March 1977, and in line with the original objectives it has achieved a 1, 000°C continuous operation inviting the successful operation at the present time.
This report first delineates the general outline of the OGL-1 and makes reference to the R & D actually employed in developing OGL-1. Then safety and structural designs incorporating developmental test results are represented in details. Finally successful performance tests of OGL-1 which enable irradiation tests of fuel specimen under the helium flow conditions of 1, 000°C, are described briefly.
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