首页
登录
职称英语
In the United States, there is some disagreement (to say the least) over the r
In the United States, there is some disagreement (to say the least) over the r
游客
2023-12-16
8
管理
问题
In the United States, there is some disagreement (to say the least) over the risks and benefits .of nuclear power. There can be no question that with our electrical power needs increasing rapidly, we cannot rely indefinitely on the earth’s remaining fossil fuel supply. The question is, can we safely shift our reliance to nuclear fission power plants—considering the present state of our knowledge and technology? The American public has, in the past few years, developed a rather strong consensus regarding this question. Nuclear power has fallen into disfavor. The risks seem too great, the reward too small—at least for the immediate future.
It is not likely that an explosion of the type produced by atomic bombs can occur in the kinds of nuclear reactors being used today. However, we still don’t know how close we came to a major tragedy at Three Mile Island. A far greater tragedy occurred at a nuclear plant at Chernobyl, in the Soviet Union’s Ukraine in 1986. The risks associated with nuclear power, however, are not always so spectacular. Some are of a far subtler nature. For example, radioactivity could be released into the environment from activities related to mining and processing nuclear fuel, from the transportation and recycling of the fuel and from storage of the radioactive wastes. We frequently hear of steam or gas leaks from the reactors themselves. ;And even the safest reactors normally leak small amounts of radiation into their immediate environment. (The problem with this is that there are no "safe" levels of radioactivity--only "acceptable" levels. )
We could probably greatly reduce the risks associated with nuclear power by simply exercising more care and common sense. There are numerous published accounts that attest to our carelessness, however. For example, it has been revealed that the Diablo Canyon nuclear power plant in California was built on an earthquake fault line. At the WNP-2 plant in Washington State, the concrete contained air bubbles and pockets of water as well as shields that had been incorrectly welded. In 1981, the Nuclear Regulatory Commission inspected forty-three plants that were under construction and rated seven "below average" and thirty-six "average". None were rated even "above average".
Completely apart from the possibility of accidents, there is the unsolved problem of what to do with the radioactive wastes generated in the course of normal nuclear plant reactions. The problem is a tough one since such wastes can only be rendered safe by the passage of time. The waste radioactivity is .generated in the fuel system of the reactors because only a part of the fuel is fissionable and, for technical reasons, not all of the fissionable elements are spent. Much of the spent fuel materials removed from the reactor can be reused. However, some of the radioactive fuel in the spent elements cannot be removed, and this material adds to the radioactive waste.
We have already generated over 10,000 tons of nuclear waste, with another 47,000 tons expected by 19951 Most of the waste is in the form of fuel rods which are, for now, stored in baths filled with a solution of neutron-absorbing boric acid. The problem is that these are only temporary repositories and,’ unless new space is found, existing plants must begin closing for lack of space. The rods can be reprocessed, but the technology could lead to the fuel for nuclear weapons.
The reprocessing also leaves "high-level liquid waste" that must be stored. The prevailing idea at the moment is to dry the liquid and mix it with molten glass that, when it hardens, can be stored in tanks. Suggestions range from burying it in the Antarctic to sending it into space. [br] Risks associated with nuclear power ______.
选项
A、can only occur at the plant Site
B、may occur when wastes are transported or recycled
C、are limited to structural problems within the plant
D、are primarily a result of carelessness
答案
B
解析
这是一道考查记忆的题目。第二段中有这样一句话,For example,radioactivity could be released into the environment from activities related to mining and processing nuclear fuel,from the transportation and recycling of the fuel and from storage of the radioactive wastes.答案很明显就在其中。
转载请注明原文地址:https://tihaiku.com/zcyy/3277356.html
相关试题推荐
ThewritingoftheConstitutionoftheUnitedStatesisanactofsuchgenius
[originaltext]MartinEdwards,chiefexecutiveofManchesterUnitedPIC,wil
ThelargestandsmalleststatesoftheUnitedStatesare______.A、AlaskaandRho
OncefoundalmostentirelyinthewesternUnitedStatesandinAsia,dinosaur
OncefoundalmostentirelyinthewesternUnitedStatesandinAsia,dinosaur
OncefoundalmostentirelyinthewesternUnitedStatesandinAsia,dinosaur
TheUnitedStatesboughtLouisianafromA、FranceB、SpainC、BritainD、MexicoA
ThelargestandsmalleststatesoftheUnitedStatesare______.A、AlaskaandRho
IntheUnitedKingdom,policeofficersarenotallowedtojoin______ortogoo
[originaltext]About200yearsago,theUnitedStateseconomywasgrowingqui
随机试题
无机结合稳定材料无侧限抗压强度试验试件制备时,试模的直径×高=100mm×100
依据JT/T496-2004,以下对于硅芯管耐落锤冲击性能试验条件的描述中,正确
关于基金的合同生效,下列说法错误的是。()A.中国证监会自收到基金管理人验资报
A.恶寒重发热轻 B.发热轻而恶风 C.发热重恶寒轻 D.但寒不热 E.
A.上皮细胞 B.红细胞 C.血小板 D.白细胞 E.淋巴细胞肾盂肾炎尿
脘腹痞闷,食少难消,大便溏薄,倦怠乏力,苔腻微黄,脉虚弱者,治宜选用A.越鞠丸
患者男性,75岁,因脑中风右侧肢体瘫痪,为预防压疮,最好的护理方法是A、让其保持
马老师在活动反思中写道:“使用档案袋对幼儿的表现进行评价,经常需要花费些额外的时
教育在人的身心发展中起主导作用,这是因为( )。 A.教育具有明确的目的性和
在下列情况中,血钠浓度通常正常的是A.等张性脱水 B.低张性脱水 C.高张性
最新回复
(
0
)