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高転換型革新的水冷却炉(HC-FLWR)の炉心設計

Core design of high conversion type FLWR

中野 佳洋; 秋江 拓志; 奥村 啓介; 大久保 努; 内川 貞夫

Nakano, Yoshihiro; Akie, Hiroshi; Okumura, Keisuke; Okubo, Tsutomu; Uchikawa, Sadao

革新的水冷却炉(FLWR)を構成する二つの炉心概念のうち、高転換型炉(HC-FLWR)について炉心設計を行い、その基本仕様を作成した。FLWRは、既存の軽水炉技術に基づいた熱出力3,926MWの沸騰水型軽水炉で、高富化度MOX燃料を用い、燃料棒は六角形のチャンネルボックス内に稠密に三角格子配置される。HC-FLWRの炉心設計では、まず予備的なパラメータサーベイ計算を行い、大まかな炉心仕様を求めた。その結果を受けて、核熱結合炉心計算コードMOSRAを用いた設計計算を行った。一次元核熱結合炉心燃焼計算を行って炉心仕様を絞り込み、燃料棒直径1.12cm,Puf富化度11%,MOX長85cm,冷却材炉心流量10t/s,炉心入口温度550K等の炉心仕様を得た。この炉心について三次元核熱結合炉心燃焼を行うとともに、燃料交換パターンを検討し、負のボイド反応度係数を維持し、出力ピーキング係数は許容範囲内に収まり、MOX領域の取出燃焼度が56GWd/t,Puf残存比が0.84という炉心性能を有する炉心設計仕様・燃料交換パターンを構築した。

A core design of a high conversion type innovative water reactor for flexible fuel cycle (HC-FLWR) with thermal output of 3926 MW has been constructed. The design study of HC-FLWR consists of two steps of analyses. The first step was preliminary parametric survey calculations and the second step was more detailed calculations with a nuclear and thermal-hydraulic coupled calculation code MOSRA. Through the 1-D core burnup calculations, the following design values were obtained. The Puf enrichment of MOX fuel is 11%. The heights of upper blanket, MOX and lower blanket regions are 5 cm, 85 cm and 5 cm, respectively. With these values, 3-D core burnup calculations were performed. In this analysis, effects of the fuel loading pattern were also investigated. Finally, a neutronics design of HC-FLWR core with a negative void reactivity coefficient, a conversion ratio of 0.84 and a discharged burnup of 56 GWd/t was obtained.

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