反应堆发生严重事故后,将堆芯熔融物滞留在压力容器内的策略(In-vessel Retention,IVR)是作为缓解严重事故的一项重要措施,该策略已成功应用于AP1000、华龙一号和CAP1400等先进压水堆的严重事故管理中。在实施IVR策略时,下封头受到高温...反应堆发生严重事故后,将堆芯熔融物滞留在压力容器内的策略(In-vessel Retention,IVR)是作为缓解严重事故的一项重要措施,该策略已成功应用于AP1000、华龙一号和CAP1400等先进压水堆的严重事故管理中。在实施IVR策略时,下封头受到高温熔融物的热负荷会发生变形,下封头的变形改变堆腔的冷却流道,这会直接影响压力容器外部冷却的排热能力和IVR策略的成功实施,有必要对下封头变形展开研究和应用。针对ISAA(Integrated Severe Accident Analysis)程序LHTCM(Lower Head Thermal Creep Module)模型简化薄膜应力模型十分简单和缺乏计算变形模块的问题,本文从机理出发,基于Timoshenko板壳理论、Nortron蠕变定律和大变形塑性理论开发了机理模型—下封头大变形模型,并将该模型集成到一体化严重事故分析程序ISAA中对FOREVER-EC2实验进行应用,预测失效时间与实验的误差仅为1.9%,预测底部伸长量与实验测量值较为符合,破口位置与实验一致。分析结果表明该模型能准确预测在堆芯熔化严重事故中下封头所受应力、失效时间、整体形变和破口位置。展开更多
For years,on the occasions of China’ national festivals,CPC’s major events and CAFIU’s big activities,I have always received corresponding letters from a Polish elder who lived thousands of miles away.These letters...For years,on the occasions of China’ national festivals,CPC’s major events and CAFIU’s big activities,I have always received corresponding letters from a Polish elder who lived thousands of miles away.These letters,expressing wishes,congratulations,expectations or emotions,record not only the old man’s deep affections for China and his Chinese friends but also the展开更多
"Elton John 把自己定义为一个摇滚明星,他确实是一个摇滚明星,而且更像一个出身罗马贵族的摇滚明星。我们一起巡演时,在Elton 的更衣室里,足有一千副墨镜、一百双鞋、五十套华丽服装。他就像是个皇室成员。相比之下,我的更衣室就..."Elton John 把自己定义为一个摇滚明星,他确实是一个摇滚明星,而且更像一个出身罗马贵族的摇滚明星。我们一起巡演时,在Elton 的更衣室里,足有一千副墨镜、一百双鞋、五十套华丽服装。他就像是个皇室成员。相比之下,我的更衣室就像个熟食店的后屋。"有一位美国的著名流行歌手曾这样描述 Elton John,这位20世纪70年代以来最杰出的英国摇滚歌手,这位以鲜艳华丽的舞台造型给人们留下了深刻印象的歌手,他的出现象征着摇滚乐向"视觉性与戏剧性"方向的发展,而他。展开更多
On November 3, 2011 when I attended the experience exchange meeting for human rights institutions held at Sichuan University, I had my first close contact with Teacher Luo Haocai. At the meeting, I gave a speech on th...On November 3, 2011 when I attended the experience exchange meeting for human rights institutions held at Sichuan University, I had my first close contact with Teacher Luo Haocai. At the meeting, I gave a speech on the theme of the history and status quo of human rights research and teaching at Southwest University of Political Science and Law (SWUPL). At lunchtime, Teacher Luo went to the restaurant with us to eat buffet, when he specially asked me to his table and further inquired about the展开更多
The traditional holidays in my family when I was a child were spent timing elaborate(精心制作的) meals around football games. My father tried to make pleasant chitchat(闲聊) and eat as much as he could during halftime...The traditional holidays in my family when I was a child were spent timing elaborate(精心制作的) meals around football games. My father tried to make pleasant chitchat(闲聊) and eat as much as he could during halftime. At Christmas he found time to have a cup or two of holiday cheer展开更多
AS a foreigner anywhere, it is important to make an effort to experience the cultural heritage of the city you are in. In Paris you should visit Montmartre, in London you can＇t miss Buckingham Palace, and before you ...AS a foreigner anywhere, it is important to make an effort to experience the cultural heritage of the city you are in. In Paris you should visit Montmartre, in London you can＇t miss Buckingham Palace, and before you leave Sydney, a trip to the Blue Mountains is essential, For Beiiing, the unquestionable birthplace of Chinese culture is buried deep within the city＇s ancient hutongs.展开更多
文摘反应堆发生严重事故后,将堆芯熔融物滞留在压力容器内的策略(In-vessel Retention,IVR)是作为缓解严重事故的一项重要措施,该策略已成功应用于AP1000、华龙一号和CAP1400等先进压水堆的严重事故管理中。在实施IVR策略时,下封头受到高温熔融物的热负荷会发生变形,下封头的变形改变堆腔的冷却流道,这会直接影响压力容器外部冷却的排热能力和IVR策略的成功实施,有必要对下封头变形展开研究和应用。针对ISAA(Integrated Severe Accident Analysis)程序LHTCM(Lower Head Thermal Creep Module)模型简化薄膜应力模型十分简单和缺乏计算变形模块的问题,本文从机理出发,基于Timoshenko板壳理论、Nortron蠕变定律和大变形塑性理论开发了机理模型—下封头大变形模型,并将该模型集成到一体化严重事故分析程序ISAA中对FOREVER-EC2实验进行应用,预测失效时间与实验的误差仅为1.9%,预测底部伸长量与实验测量值较为符合,破口位置与实验一致。分析结果表明该模型能准确预测在堆芯熔化严重事故中下封头所受应力、失效时间、整体形变和破口位置。
文摘For years,on the occasions of China’ national festivals,CPC’s major events and CAFIU’s big activities,I have always received corresponding letters from a Polish elder who lived thousands of miles away.These letters,expressing wishes,congratulations,expectations or emotions,record not only the old man’s deep affections for China and his Chinese friends but also the
文摘On November 3, 2011 when I attended the experience exchange meeting for human rights institutions held at Sichuan University, I had my first close contact with Teacher Luo Haocai. At the meeting, I gave a speech on the theme of the history and status quo of human rights research and teaching at Southwest University of Political Science and Law (SWUPL). At lunchtime, Teacher Luo went to the restaurant with us to eat buffet, when he specially asked me to his table and further inquired about the
文摘The traditional holidays in my family when I was a child were spent timing elaborate(精心制作的) meals around football games. My father tried to make pleasant chitchat(闲聊) and eat as much as he could during halftime. At Christmas he found time to have a cup or two of holiday cheer
文摘AS a foreigner anywhere, it is important to make an effort to experience the cultural heritage of the city you are in. In Paris you should visit Montmartre, in London you can＇t miss Buckingham Palace, and before you leave Sydney, a trip to the Blue Mountains is essential, For Beiiing, the unquestionable birthplace of Chinese culture is buried deep within the city＇s ancient hutongs.
