博碩士論文 104626011 詳細資訊




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姓名 呂金璋(Chin-Chang Lu)  查詢紙本館藏   畢業系所 水文與海洋科學研究所
論文名稱 低放射性廢棄物在近岸環境坑道處置之核種衰變傳輸模擬
(Simulating Radionuclide Decay Transport of Low-level Radioactive Waste with Tunnel Disposal in Nearshore Environments)
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摘要(中) 近岸山區為台灣低階核廢料處置設施的建議候選場址之一,透過坑道處置來封存核廢料以減少核種外釋可能,處置設施規劃設置於地表下五十至兩百公尺處,包含多條處置坑道以存放不同類型的低階核廢料,處置坑道由多重工程障壁構成,利用多重工程障壁及母岩達到良好的核種圍阻與遲滯功能,防止核種從處置坑道遷移至人類生活圈進而對人類健康造成危害。
本研究參考瑞典SR-PSU場址技術報告,將模擬分為遠場與近場之流場模擬及核種傳輸模擬,在考量有限運算資源與提高運算解析度雙重考量下,將模擬網格設計為遠場、近場(處置設施)與近場(處置坑道)的三層級網格,透過邊界條件設定來串接不同層級的模擬成果,以達到近遠場核種衰變鏈整合數值模擬之目的。模擬工作採用HYDROGEOCHEM 5.6數值模擬工具,將處置設施預計接收國內核電廠除役廢棄物、運轉廢棄物的核種總量做為近場(處置坑道)源項進行核種傳輸模擬,分析近、遠場之穩態地下水流流場特徵,穩態傳輸、暫態傳輸及11種關鍵核種及其衰變鏈之暫態核種傳輸於近岸環境之移棲特性。
摘要(英)
Tunnel disposal at nearshore was tentatively selected as one of final disposal sites for low-level wastes in Taiwan. The potential disposal facilities was located at 50m~200m below ground surface and designed with several disposal tunnels. The safety function of disposal tunnels with multiple engineered barriers and host rock is to provide retardation and containment of radionuclide for preventing potential release of radionuclides from the repository into human living environment to threaten human health.
Simulations of flow and radionuclide transport were sequentially performed for near-field and far-field setups as proposed in technical reports of SKB SR-PSU site. In this study, three levels of grids were designed with far-field, near-filed (all tunnels), and near-field (selected tunnel section) to reduce computation time without compromising spatial resolution. The HYDROGEOCHEM_5.6 model was used to perform each level of simulations. The linkages between different simulation levels were connected by boundary conditions retrieved from outputs of other simulation levels.. Total radioactive activities of source term were estimated as given in the report of Taiwan Power Company. Steady transport, transient transport, and 11 radionuclide decay chains were performed with steady flow for demonstrations.
關鍵字(中) ★ 低放射性廢棄物
★ 近岸環境
★ 坑道處置
★ 核種
★ 核衰變
★ 移棲
關鍵字(英) ★ Low-level Radioactive Waste
★ Nearshore Environments
★ Tunnel Disposal
★ Radionuclide
★ Decay
★ Migration
論文目次
摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 ix
一、緒論 1
1-1  前言 1
1-2  研究目的 2
1-3  研究架構 2
二、文獻回顧 4
2-1  近場機制與核種傳輸 4
2-2  遠場機制與核種傳輸 6
2-3  解析解發展成果 7
三、研究區域 8
3-1  地理位置、地形與氣候 8
3-2  低階核廢料處置設施介紹 10
四、研究方法 13
4-1  HYDROGEOCHEM 5.6 模式介紹 13
4-1-1 流體控制方程式 13
4-1-2 傳輸控制方程式 15
4-2  多核種衰變鏈與參數 18
4-3  網格建置與水文地質參數 22
4-3-1 三維遠場 22
4-3-2 三維近場(處置設施) 24
4-3-3 二維近場(處置坑道) 25
4-4  近遠場核種傳輸數值模擬銜接 29
4-4-1 流場邊界條件設定 30
4-4-2 傳輸邊界條件設定 32
4-5  模擬案例設定 34
4-5-1 案例1 – 穩態流場與穩態傳輸模擬 34
4-5-2 案例2 – 穩態流場與暫態傳輸模擬 34
4-5-3 案例3 –多核種衰變鏈模擬 34
五、結果與討論 36
5-1  案例1模擬結果 36
5-2  案例2模擬結果 44
5-3  案例3模擬結果 52
六、結論與建議 67
6-1  結論 67
6-2  建議 68
參考文獻 69
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指導教授 李明旭(Ming-Hsu Li) 審核日期 2017-7-28
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