理工类：阅读理解Experts Call
The withdrawal of Nevadas Yucca Mountain as a potential nuclear waste repository1 has reopened the debate over how and where to dispose of spent nuclear fuel and high-level nuclear waste. In an article in the July 10 issue of Science， University of Michigan2 geologist Rodney Ewing and Princeton University3 nuclear physicist Frank von Hippel argue that， although federal agencies should set standards and issue licenses for the approval of nuclear facilities， local communities and states should have the final approval on the siting of these facilities. The authors propose the development of multiple sites that would service the regions where nuclear reactors are located.
“The main goal…， should be to provide the Unied States with multiple process that requires acceptance by host communities and states，” the authors write.
Ewing and yon Hippel also analyze the reasons why Yucca Mountain， selected by Congress4 in 1987 as the only site to be investigated for long-term nuclear waste disposal， finally was shelved5 after more than three decades of often controversial debate. The reasons include the sites geological problems， management problems， important changes in the Environmental Protection Agencys standard， unreliable funding and the failure to involve local communities in the decision-making process.
Going forward， efforts should be directed at locating storage facilities in the nations northeastern， southeastern， midwestern and western regions， and states within a given region should be responsible for developing solutions that suit their particular circumstances. Transportation of nuclear waste over long distances， which was a concern with the Yucca Mountain site， would be less of a problem because temporary storage or geological disposal sites could be located closer to reactors.
“This regional approach would be similar to the current approach in Europe， where spent nuclear fuel6 and high-level nuclear waste7 from about 150 reactors and reprocessing plants is to be moved to a number of geological repositories in a variety of rock types8，” said Rodney Ewing， who has written extensively about the impact of nuclear waste management on the environment and who has analyzed safety assessment criteria for the controversial Yucca Mountain nuclear waste repository.
词汇：
radioactive adj.放射性的 shelve v.搁置 repository n.储藏地，储藏室 controversial adj.有争议的
geologist n.地质学家 reactor n.反应堆，反应器 geological adj.地质的
注释：
1. The withdrawal of Nevadas Yucca Mountain as a potential nuclear waste repository： Nevadas Yucca Mountain：美国境内的内华达州尤卡山。nuclear waste repository：核废物处理库。美国能源部部长朱棣文 2009 年 3 月 5 日表示，拟在内华 达州尤卡山建设的核废物最终处理库将不再是美国储存高放废物的一个选项。
2. University of Michigan：美国密歇根大学，建于 1817 年。
3. Princeton University：美国普林斯顿大学，建于 1746 年。
4. Congress： 美国国会，美国最高立法机关，由参议院（Senate）和众议院（House of Representatives）组成。
5. …was shelved：……被束之高阁。
6. spent nuclear fuel：也叫做 used nuclear fuel，一般译为“乏核燃料”。
7. high-level nuclear waste：高（强度）放（射性）核废物。
8. geological repositories in a variety of rock types：各种不同岩层中的地质处置 库。geological repositories 指的是地表以下 300～1500 米的稳定的地质体中建造的 用于最终处置高放废物和乏核燃料的工程设施。处置库是一个多重屏障系统，工程屏障 由废物体、废物罐、外包装和缓冲回填材料组成，而天然屏障则是能有效阻滞放射性核 素迁移的地质体，包括花岗岩、粘土岩、凝灰岩和岩盐等。许多专家认为地质处置是安 全的，技术上是可行的，对环境是无害的。