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Concept of an inherently-safe high temperature gas-cooled reactor

Ohashi, Hirofumi ; Sato, Hiroyuki  ; Tachibana, Yukio ; Kunitomi, Kazuhiko ; Ogawa, Masuro

As the challenge to ensure no harmful release of radioactive materials at the accidents by deterministic approach instead to satisfy the safety goal of the risk by probabilistic approach, new concept of advanced reactor, an inherently-safe high temperature gas-cooled reactor, is proposed based on the experience of the operation of the actual HTGR in Japan, HTTR, and the design of the commercial plant (GTHTR300), utilizing the inherent safety features of the HTGR (i.e., safety features based on physical phenomena). The safety design philosophy of the inherently-safe HTGR for the safety analysis of the radiological consequences is determined as the confinement of radioactive materials is assured by only inherent safety features without engineered safety features, AC power or prompt actions by plant personnel if the design extension conditions occur. The concept and future R&D items for the inherently-safe HTGR are described in this paper.

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