JP6300953B2 - 原子炉燃料棒およびそれを束ねた燃料集合体 - Google Patents
原子炉燃料棒およびそれを束ねた燃料集合体 Download PDFInfo
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Description
(i)前記所定の金属接合材は、ケイ素(Si)、Si合金、チタン(Ti)、Ti合金、ジルコニウム(Zr)、およびZr合金から選ばれる一種であり、前記所定の被覆金属は、Ti、Ti合金、Zr、およびZr合金から選ばれる一種である。
(ii)前記接合部被覆の厚さが0.1 mm以上1 mm以下である。
(iii)前記炭化ケイ素材料は、炭化ケイ素をマトリックスとし炭化ケイ素繊維を複合する炭化ケイ素繊維強化炭化ケイ素複合材料である。
(iv)前記炭化ケイ素材料は、前記炭化ケイ素繊維強化炭化ケイ素複合材料の表面の一部に炭化ケイ素層が更に形成されている材料である。
(v)前記接合部における前記燃料被覆管と前記端栓との突き合わせ面は、その面方向が該燃料被覆管の軸方向に対して5°以上60°以下の傾角を有するように形成されている。
(vi)前記燃料被覆管と前記端栓とが、更にねじ構造によって締結されている。
図1は、本発明に係る原子炉燃料棒の一例を示す部分断面模式図である。図1に示したように、本発明の原子炉燃料棒10は、燃料被覆管11と、該燃料被覆管11の両端に接合され燃料被覆管11を封じる端栓12(12a,12b)とを有し、燃料被覆管11内に複数の燃料ペレット13が装填されている。燃料ペレット13を固定するため、連装された燃料ペレット13の一方の端部は、プレナムスプリング15によって押圧されている。また、燃料被覆管11と端栓12との接合部周りは、接合部被覆14で覆われている。
図3は、本発明に係る燃料集合体の一例を示す模式図であり、(a)縦断面図、(b)A−A線の横断面図である。図3(a),(b)に示した燃料集合体30は、沸騰水型原子炉(BWR)用の燃料集合体の一例であり、上部タイプレート31と、下部タイプレート32と、これらの上部・下部タイプレート31,32に両端が保持されている複数の燃料棒10およびウォータロッド33と、燃料棒10およびウォータロッド33を束ねる燃料支持格子(スペーサ)34と、上部タイプレート31に取り付けられ燃料棒束を取り囲むチャンネルボックス35とを備えている。端的に言うと、横断面角筒状のチャンネルボックス35内に、燃料棒10(全長燃料棒とも言う)と部分長燃料棒36とウォータロッド33とが正方格子状に束ねられて収容されている(図3(b)参照)。
複数種の金属接合材を用意し、SiC板同士の接合実験を行った。SiC板は、その表面にSiC層を形成したものを用いた。表1に用意した金属接合材の諸元を示す。
複数種の被覆金属を用意し、SiC/SiC複合材料板上に接合部被覆を形成した後、高温水腐食実験を行った。表2に用意した被覆金属の諸元を示す。
Claims (7)
- 軽水炉用の原子炉燃料棒であって、
共に炭化ケイ素材料からなる燃料被覆管および端栓を有し、
前記燃料被覆管と前記端栓との接合部は、固相線温度が1200℃以上である所定の金属接合材を介したろう付けおよび/または拡散接合によって形成されており、
前記接合部の外表面と該接合部外表面に隣接する前記燃料被覆管および前記端栓の外表面の一部とが、所定の被覆金属からなる接合部被覆で覆われており、
前記所定の金属接合材および前記所定の被覆金属は、その平均線膨張係数が10 ppm/K未満であり、
前記所定の金属接合材は、質量%表記した組成で、
Si-0.08%以下C、
Si-50%以下Ge-0.08%以下C、
Si-5%以下Mo-20%以下W-40%以下Fe、
Si-2%以下Ti-2%以下Zr-2%以下Ta-2%以下V-2%以下Y-2%以下Cr、
Ti-0.3%以下Fe-0.08%以下C、
Ti-50%Zr-0.3%以下Fe-0.08%以下C、
Zr-0.3%以下Fe-0.08%以下C、
Zr-1.2〜1.7%Sn-0.03〜0.08%Ni-0.07〜0.2%Fe-0.05〜0.15%Cr-0.005%以下Ti、
Zr-1.2〜1.7%Sn-0.18〜0.24%Fe-0.07〜0.13%Cr-0.005%以下Ti、および
Zr-1〜2.5%Nb-0.005%以下Tiから選ばれる一種であり、
前記所定の被覆金属は、質量%表記した組成で、
Zr-1.2〜1.7%Sn-0.03〜0.08%Ni-0.07〜0.2%Fe-0.05〜0.15%Cr-0.005%以下Ti、
Zr-1.2〜1.7%Sn-0.18〜0.24%Fe-0.07〜0.13%Cr-0.005%以下Ti、
Zr-1〜2.5%Nb-0.005%以下Ti、
Ti-0.12〜0.25%Pd-0.3%以下Fe-0.08%以下C、
Ti-37.5%Zr-15%Cu-10%Ni、
Ti-37.5%Zr-25%Cu、
Ti-37.5%Zr-25%Ni、および
Ti-0.3%以下Fe-0.08%以下Cから選ばれる一種であることを特徴とする原子炉燃料棒。 - 請求項1に記載の原子炉燃料棒において、
前記接合部被覆の厚さが0.1 mm以上1 mm以下であることを特徴とする原子炉燃料棒。 - 請求項1又は請求項2に記載の原子炉燃料棒において、
前記炭化ケイ素材料は、炭化ケイ素をマトリックスとし炭化ケイ素繊維を複合する炭化ケイ素繊維強化炭化ケイ素複合材料であることを特徴とする原子炉燃料棒。 - 請求項3に記載の原子炉燃料棒において、
前記炭化ケイ素材料は、前記炭化ケイ素繊維強化炭化ケイ素複合材料の表面の一部に炭化ケイ素層が更に形成されている材料であることを特徴とする原子炉燃料棒。 - 請求項1乃至請求項4のいずれかに記載の原子炉燃料棒において、
前記接合部における前記燃料被覆管と前記端栓との突き合わせ面は、その面方向が該燃料被覆管の軸方向に対して5°以上60°以下の傾角を有するように形成されていることを特徴とする原子炉燃料棒。 - 請求項1乃至請求項5のいずれかに記載の原子炉燃料棒において、
前記燃料被覆管と前記端栓とが、更にねじ構造によって締結されていることを特徴とする原子炉燃料棒。 - 複数の原子炉燃料棒を束ねて構成される燃料集合体であって、
前記原子炉燃料棒が、請求項1乃至請求項6のいずれかに記載の原子炉燃料棒であることを特徴とする燃料集合体。
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