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題 名 | 核燃料束截面處理程式準確性之驗證=Validation of the Accuracy of Lattice Physics Code in Core Management System |
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作 者 | 薛燕婉; 胡志傑; 蘇秀瑛; 林志保; | 書刊名 | 台電工程月刊 |
卷 期 | 591 1997.11[民86.11] |
頁 次 | 頁45-55 |
分類號 | 449.4 |
關鍵詞 | 核燃料束; 截面處理程式; 準確性; 驗證; Fuel lattice; Cross section; Accuracy; Validation; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究針對臺電目前使用之燃料設計,評估燃料束截面處理程式 CASMO-3、-4 之 準確性。 選定核二廠二號機( KSI )第九至十二週期( CY09-12 )為測試之對象。 使用 CASMO/TABLES-3/SIMULATE-3 進行爐心追隨計算及冷爐計算, 與測量值比較。 結果顯示 CASMO-4 求得之燃料束 K 值均較 CASMO-3 較高。 用於 KS1CY09 至 CY11 之爐心追隨計算 可使 keff 值很接近 1.0,比使用 CASMO-3 時高出∼ 3mk。不過與 TIP 測量值之比較則不 如用 CASMO-3 時靠近。冷爐臨界值計算使用 CASMO-4 截面會較 CASMO-3 高約 2 至 3mk, 但距離 1.0 仍相差 5 至 7mk。MCNP4A 與 CASMO-4 在爐心初始燃料束計算之結果相當吻合 。在不同空泡比及溫度下兩者 K �帕萛t均在 5mk 以下,分裂反應速率差值之平均平方根也 在 2 %以下。CASMO-3 會低估含 Gd 燃料棒附近分夸反應速率之現象,在 CASMO-4 中已有 明顯的改善。針對目前 ASMO-4 採用近似模擬之間隔物及控制棒部份,由 MCNP 模擬計算顯 示,間隔物近似模擬方式應不會對計算結果有太大影響,控制棒之簡化模擬則影響略大。經 由以上測量值與蒙地卡羅計算之驗證, 顯示 CASMO-4 燃料束截面處理程式之準確度尚稱令 人滿意。 |
英文摘要 | The purpose of this study is to evaluate the accuracy of the lattice physics code CASMO-3 and -4. Cycle 9 to 12 of KSI are tested using CASMO/TABLE-3/SIMULATE-3. The K �� 's of fuel assembly calculated by CASMO-4 are very closed 1.0, and are ∼ 3 mk higher than the results when assembly cross sections generated by CASMO-3 are used. The TIP comparison, however, is slightly inferior when CASMO-4 is used. The cold critical results of cycle 10 to 12 are 2 to 3 mk higher when CASMO-4 is used. There, however, remains 5 to 7 mk difference from the critical value of 1.0. The results of assembly calculations using CASMO-4 and MCNP4A agree well. The differences in K �� are <5 mk under varies void and temperature conditions. The r.m.s. error of the fission rate distributions are also <2%. The underestimation of fission rate near Gd rod found in CASMO-3 calculation is apparently improved in the CASMO-4 calculation. MCNP modeling shows that the approximate model for spacer presently used in CASMO-4 calculation will not cause large errors. The approximate model for control rod in CASMO-4, howerev, has slightly larger effects. Both the comparisons with measurements and with the Monte Carlo calculations show that the ccuracy of the CASMO-4 is satisfactory. |
本系統中英文摘要資訊取自各篇刊載內容。