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Establishment of floating support technology applied to high-temperature components and piping in HTTR

HTTRの高温機器・配管に採用された浮動支持技術の確立

篠原 正憲; 稲葉 良知; 濱本 真平; 藤本 望

Shinohara, Masanori; Inaba, Yoshitomo; Hamamoto, Shimpei; Fujimoto, Nozomu

原子炉出口温度950$$^{circ}$$CとなるHTTRの1次冷却系において、中間熱交換器や高温2重配管のような高温機器・配管は、非常に高温となり、大きく複雑な熱変位を生じる。この熱変位を吸収するだけでなく地震にも耐えるために、HTTRは3次元浮動支持方式を採用している。原子炉格納容器の限られた空間において、本支持方式は、高温機器・配管の自重を支え、熱変位に追従し、耐震性能を持つことができる。一方で、浮動支持方式を原子力プラントへ採用した実績は過去になく、本方式の有効性をHTTRを用いて実証することとした。本論文では、HTTRの運転データを用いて、高温機器・配管の熱変位挙動を調べると共に、その挙動特性の数値解析を実施した。さらに、東北地方太平洋沖地震によるHTTRへの影響を確認した。その結果、HTTRに採用された本支持方式が有効であることを明らかにした。

In the primary cooling system of the High Temperature engineering Test Reactor (HTTR) with an outlet coolant temperature of 950$$^{circ}$$C, high-temperature components and piping such as an intermediate heat exchanger and coaxial double piping reach very high temperature, and large and complex thermal displacements arise in them. In order not only to absorb the thermal displacements but also to withstand earthquakes, the HTTR has adopted a new three-dimensional floating support system. In the limited space of the containment vessel, the support system can support the components' and piping's own weights and follow the thermal displacements and have seismic capacity. On the other hand, the adoption of the support system was unprecedented in nuclear plants. Thus, the effectiveness of the support system was demonstrated through the HTTR operation. In this paper, by using the HTTR operation data, the thermal displacement behavior of the high-temperature components and piping is investigated, and the behavior and characteristics are simulated numerically. In addition, the aftermath of the Great East Japan Earthquake on the HTTR is confirmed. As a result, the effectiveness of the three-dimensional floating support system adopted by the HTTR is verified.

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パーセンタイル:100

分野:Nuclear Science & Technology

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