公开(公告)号：US4766658A

公开(公告)日：1988-08-30

申请号：US884895

申请日：1986-07-14

申请人： Toshihiro Matsumoto ,  Hajime Umehara ,  Junjiro Nakajima ,  Norihisa Fujii

发明人： Toshihiro Matsumoto ,  Hajime Umehara ,  Junjiro Nakajima ,  Norihisa Fujii

IPC分类号： G21C3/20 ,  C22B9/22 ,  C22B34/14 ,  G21C3/07 ,  B23P17/00

CPC分类号： G21C3/07 ,  C22B34/14 ,  C22B9/228 ,  G21Y2002/103 ,  G21Y2002/201 ,  G21Y2002/206 ,  G21Y2004/40 ,  Y02E30/40 ,  Y10T29/49929 ,  Y10T29/49988 ,  Y10T29/49991

摘要： A method of producing a composite nuclear fuel cladding lined with a liner of high purity zirconium characterized in that a raw material of zirconium sponge disposed in a hearth cavity is irradiated with an electron beam while controlling an amount of heat per unit volume (w.sec/mm.sup.3) according to an oxygen removal rate of the raw material determined by oxygen concentration of the raw material and a target oxygen concentration of an ingot for a liner to be refined, and zircaloy cladding is lined with the liner. The hearth cavity has a preferable shape in which the ratio of the cavity surface to the cavity volume is 0.20 mm.sup.-1 or larger.

摘要翻译： 一种生产具有高纯度锆衬的复合核燃料包覆层的方法，其特征在于，在控制每单位体积的热量（w·sec）的同时，照射设置在炉床腔中的锆海绵原料 / mm 3），根据由原料的氧浓度确定的原料的氧除去率和待精制衬管的锭的目标氧浓度，并且将锆石覆层与衬垫衬里。 炉膛腔具有其中空腔表面与空腔体积的比率为0.20mm-1或更大的优选形状。

公开(公告)号：US5388132A

公开(公告)日：1995-02-07

申请号：US121898

申请日：1993-09-16

申请人： Motoo Aoyama ,  Yasunori Bessho ,  Junichi Yamashita ,  Katsumasa Haikawa ,  Hajime Umehara ,  Osamu Yokomizo ,  Hideo Soneda ,  Mitsunari Nakamura

发明人： Motoo Aoyama ,  Yasunori Bessho ,  Junichi Yamashita ,  Katsumasa Haikawa ,  Hajime Umehara ,  Osamu Yokomizo ,  Hideo Soneda ,  Mitsunari Nakamura

IPC分类号： G21C3/328 ,  G21C3/62

CPC分类号： G21C3/328 ,  G21Y2002/201 ,  G21Y2004/10 ,  G21Y2004/30 ,  Y02E30/31 ,  Y02E30/38

摘要： A mean uranium enrichment of fuel rods is set to not less than 4 wt% and preferably 4.25%, a percentage in number of Gd rods to all the fuel rods is set in the range of 20 to 30% and preferably 23%, and an enrichment 4.45 wt% of the Gd rods is between a pellet maximum uranium enrichment and a pellet minimum uranium enrichment. A percentage in number of those fuel rods having a maximum uranium enrichment of 5.0% to all the fuel rods except the Gd rods is set to not less than 75% and preferably 82%. A mean uranium enrichment in the enriched fuel section except blanket regions at upper and lower end portions is 4.75 wt% and a ratio e.sub.max /e.sub.mean of the pellet maximum uranium enrichment to that mean uranium enrichment is not larger than 1.16 and preferably 1.105. Accordingly, when the maximum uranium enrichment is limited to 5.0 wt%, the mean uranium enrichment can be raised to attain mean discharged exposure not less than 45 GWd/t without causing any problems in gadolinia containing fuel rods.

摘要翻译： 将燃料棒的平均铀浓缩设定为不低于4重量％，优选为4.25％，将所有燃料棒的Gd棒的数量设定在20〜30％，优选为23％的范围内， 富集4.45重量％的Gd棒是在颗粒最大铀浓缩和沉淀最小铀浓缩之间。 对除了Gd棒以外的所有燃料棒，具有5.0％的最大铀浓缩的燃料棒的数量的百分比设定为75％以上，优选为82％。 富集燃料部分的平均铀浓缩除上下部分的覆盖区域为4.75重量％，并且颗粒最大铀浓缩与该平均铀浓缩物的比例emax / emean不大于1.16，优选为1.105。 因此，当最大铀浓缩限制为5.0重量％时，可以提高平均铀浓缩以达到不低于45GWd / t的平均排放暴露，而不会在含钆燃料棒中引起任何问题。