SAFETY CONCEPT OF SEVERE ACCIDENT FREE HTR AND ITS DEMONSTRATION BY THE HTTR

摘要

A severe accident free HTR (SFHTR) can achieve extremely higher degree of safety than an HTGR designed previously. The SFHTR is completely free from severe accidents that cause a large amount of fuel failure. Moreover, the safety concept of the SFHTR will be demonstrated by using High Temperature Engineering Test Reactor (HTTR). In the HTTR, nearly full-scale worst events postulated in the SFHTR will be tested. Demonstrable safety is essential for future nuclear reactors and is only achieved due to inherent safety features in the HTGR. Demonstrable safety and license by test are completely different approaches from existing reactors. This paper describes the safety concept of the SFHTR and safety demonstration tests of the HTTR.