發(fā)展核電是減少我國環(huán)境污染的有效途徑
11GM-BS2近年來,霧霾頻發(fā),燃煤是大氣污染的主要來源。核能屬于低碳、密集性能源,以核能發(fā)電代替燃煤發(fā)電,對削減溫室氣體排放量的潛在貢獻(xiàn)非常明顯,同時(shí)也是減少我國環(huán)境污染的現(xiàn)實(shí)有效途徑。
中國工程院院士、輻射防護(hù)和環(huán)境保護(hù)專家潘自強(qiáng)告訴記者,一件事物不能簡單評說孰優(yōu)孰劣,對電能來說,系統(tǒng)的比較是指基于燃料鏈的比較,而不是電廠本身。11GM-BS2以核電為例,即不僅指核電廠本身,而是指包括開采→水冶→轉(zhuǎn)化→濃縮→元件制造→發(fā)電處理→廢物處置的全過程。
上世紀(jì)90年代中期,我國曾對煤電鏈和核電鏈產(chǎn)生的環(huán)境危害做過比較,當(dāng)時(shí)的結(jié)果是:從大氣污染物排放來看,正常情況下,燃煤發(fā)電向環(huán)境排放二氧化硫、氮氧化物、顆粒物等污染物,而核發(fā)電不產(chǎn)生任何大氣污染物;從放射性流出物排放來看,煤中含有天然存在的原生放射性核素,通過燃煤電廠的煙塵排放到環(huán)境中,而核電鏈向環(huán)境排放的氣態(tài)和液態(tài)流出物遠(yuǎn)低于天然本底水平,產(chǎn)生數(shù)量很少的固體廢物作封閉處理,沒有外排??偟膩碚f,煤電鏈對公眾產(chǎn)生的輻射照射約為核電鏈的50倍。
11GM-BS2國家能源局原局長張國寶曾表示,對于煤炭占一次能源67%的中國來說,增加核電是一個(gè)現(xiàn)實(shí)的選擇,它沒有溫室氣體排放;同時(shí),沿海建設(shè)的核電站都用海水冷卻,大大節(jié)約了淡水資源。
根據(jù)該機(jī)構(gòu)最高預(yù)測值,2030年全球核電裝機(jī)容量將達(dá)到727吉瓦(1吉瓦等于10億瓦),比目前增長一倍。
11GM-BS2因此,國務(wù)院2014年年底印發(fā)《能源發(fā)展戰(zhàn)略行動(dòng)計(jì)劃(2014—2020年)》提出,在采用國際最高安全標(biāo)準(zhǔn)、確保安全的前提下,適時(shí)在東部沿海地區(qū)啟動(dòng)新的核電項(xiàng)目建設(shè),研究論證內(nèi)陸核電建設(shè)。到2020年,核電裝機(jī)容量達(dá)到5800萬千瓦,在建容量達(dá)到3000萬千瓦以上。
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