地球運轉至今已存在超過45億年，並以穩定的功率輸出釋放著能量，地質分析證實地球最中心的地核─地心(Deep-earth)，蘊含著重金屬元素，包括鈾、釷等，故提出於地心環境具有長期快中子核分裂鏈反應的地心核反應器，為地球能量來源之一。
針對地心核反應器存在的可能性，本研究使用SCALE 6.0 的TRITON控制模組T6-DEPL序列，以其中三維蒙地卡羅臨界計算程式KENO與燃耗計算程式ORIGEN-S進行地心核反應器可行性評估探討，將45億年燃耗模擬計算結果和另一研究團隊研究結果進行比較，並得到趨勢一致的計算結果。
本研究經模擬計算分析，驗證地心核反應器系統，在特定條件下，可成功維持長達45億年以上的燃耗，並持續提供3 – 5 TW的穩定功率；甚至以3 TW功率能繼續燃耗至64億年，keff值皆保持在1以上的臨界與超臨界狀態。而利用64億年燃耗結果的核種進行分析，發現主要功率生成來源為含量最多的鈾金屬，其中以易裂核種235U分裂產生能量，可孕核種238U持續吸收中子轉化成235U，以補充其含量，轉化率平衡時達0.9
，形成一Converter，維持反應器運轉所需的鈾含量，而64億年的組成仍保持6.58 wt%的易裂核種濃縮度，若有其它鈾礦含量來源，如下層地幔的鈾含量經沉積或熱對流至底層的地核內，則能讓地心核反應器持續燃耗下去，而具有更長時間的運轉潛力。
地心核反應器運轉機制，經本研究分析及整合，提出兩種型式的運轉模型：內核反應器以及地核夾層反應器。兩種核反應器皆藉由重力沉積與分離，將燃料集中並移除燃耗產生的分裂產物毒物，並由傳導熱流將被重力差排出的分裂產物帶離出爐心燃料區。關於運轉之反應度的調控，除了靠溫度和膨脹係數外，內核反應器主要是經燃耗產生高熱與內核材料混合並降低易裂核種濃縮度，達到如控制棒的反應度調控；而地核夾層反應器由於存在於流動的液態外核層，沉積於固態內核外殼上的燃料易達到超臨界狀態而噴發至外核中，由此稀釋易裂核種濃縮度，達到如硼酸濃度的反應度調控。兩種核反應器可同時存在，藉由分佈於各個區域的小型地心核反應器，在不同時期進行燃耗，相互交替運轉，最後達到穩定的平均總功率輸出。

摘要 I
致謝 II
目錄 III
表目錄 V
圖目錄 VI

第一章 緒論 1
1.1、前言 1
1.2、地心核反應器的假說依據 3
1.2.1、地磁的生成 3
1.2.2、天然自發分裂核反應器 4
1.2.3、3He/4He比例 4
1.2.4、反微中子(antineutrino)測量 5
1.3、地球的結構 5
1.4、地心核反應器發展史 9
第二章 計算程式介紹 10
2.1、SCALE 計算程式系統介紹 10
2.1.1、SCALE 標準物質組成資料庫 12
2.1.2、SCALE 截面資料庫 13
2.1.3、SCALE 核種衰變資料庫 17
2.2、TRITON 19
2.2.1、TRITON預測-修正法 19
2.2.2、T6-DEPL 21
2.3、SAS2 23
第三章 程式修改與應用 24
3.1、快中子反應器計算 24
3.2、燃耗時間執行的限制 26
第四章 地心核反應器燃耗計算與核種分析 30
4.1、計算參數設定 30
4.1.1、地心核反應器爐心設定 31
4.1.2、燃耗參數設定 33
4.1.3、蒙地卡羅程式設定 34
4.1.4、參數設定總結 36
4.2、45億年燃耗結果分析與討論 36
4.2.1、Herndon和Hollenbach團隊計算結果比較 37
4.2.2、5 TW固定功率燃耗結果分析與討論 42
4.3、64億年燃耗結果討論與核種分析 45
4.3.1、64億年燃耗結果分析與討論 45
4.3.2、64億年核種結果分析與討論 47
第五章 地心核反應器模型探討 69
5.1、內核反應器運轉模型 69
5.2、地核夾層反應器運轉模型 71
第六章 結論 76
第七章 未來工作 78
參考資料 79
附錄A 自動修改程式使用說明 85
附錄B 地心核反應器輸入檔 93
附錄C 修正時間週期測試 95

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