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題名 | 地化模式EQ3NR/6應用於蘭嶼核廢料貯存場址之研究 |
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作者 | 劉振宇; 王淑美; | 書刊名 | 國立臺灣大學農學院研究報告 |
卷期 | 32:2 1992.06[民81.06] |
頁次 | 頁67-84 |
分類號 | 449.8 |
關鍵詞 | 地化模式; 核廢料; 場址; 貯存; 蘭嶼; |
語文 | 中文(Chinese) |
中文摘要 | 低放射性核廢料最終處置方式以地下掩埋較佳,但由於其放射性與化學 親和力極易與岩石發生複雜之化學反應,為求正確評估其對地下水環境所造成之 衝擊,地化模式為不可或缺之基本工具。 本文收集目前國內外著名之地化模式,經一系列之篩選過程,選取美國利弗摩國 家實驗室發展出之地化模式EQ3NR/6以評估我國低放射性核廢料貯存場之地化 程式'EQ3NR/6為一地質化學、水合物種生成/溶解度及溶液/礦物間溶解/沉澱質量 交換之反應路徑程式,除可計算水溶液之平衡外,亦可計算礦物之生成/溶解, 並自動搜尋最穩定之礦物組成。模式成功的應用在過飽和海水之模擬,並就蘭嶼 貯存場附近之地下水質及礦物組成進行現地模擬,結果顯示EQ3NR/6適用於模擬 蘭嶼之地化特性,預測出之礦物組成與現地之礦物組成一致,並且推斷該區之水 質已處於近化學平衡狀態,可以在化學平衡假設下評估核廢料中地化所產生之影 響。 |
英文摘要 | Land burial is the proposed method for low level radioactive waste disposal. Because of the radioactive and strong chemical affinity,radioactive waste tends to react with groudwater and host rock. Howto assess these complex Chemical reactions and their impact on thehydrology environment and biosphere become an important issue. Ageneral hydrogeochemical model is considered to be the best tool toquantify these reaction processes. This paper is to review the existing hydrogeochemical model andselect the most suitable model for assessing the geochemical reactionson the low level radioactive waste disposal site in Taiwan. EQ3NR/6 isselected for this purpose. The model is an aqueous/solid reaction pathmodel which accounts acid/base reaction, aqueous complexation,oxidation/reduction, precipitation/dissolution and kinetic mineraldissolution under partially equilibrium condition. The model simulatesthe aqueous/solid speciation and automatically search for the correctmineral assemblage. EQ3NR/6 is successfully applied to the cases ofsupersaturated seawater and the Lan-Yu Low Level Radioactivestorage site. The simulated result from Lan-Yu case suggests thatEQ3NR/6 is able to model the in-situ geochemical reactions. Thesimulated mineral assemblage is consistent with the in-situ mineralcomposition in Lan-Yu. It shows that the aqueous phase is nearchemical equilibrium condition thus the equilibrium is applicable toLan-Yu. |
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