CORCA-based Software Implementation of Core Solution and Conjugate Calculation with Fixed Neutron Source
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摘要: 深度次临界状态下,传统源倍增法在核反应堆反应性测量上具有精度低的特点,为提高测量精度,本文对CORCA软件进行扩充,开发了具备固定源问题求解和带不连续因子中子价值求解功能的CORCA-FIX软件,并采用对照程序和实堆数据对CORCA-FIX软件进行了计算验证。验证结果证实,CORCA-FIX在求解带固定源堆芯的深度次临界状态时有着较高的精度,输出的结果应用于实堆数据后获得了更好的次临界度测量结果,且满足工程应用中反应性测量的偏差准则。Abstract: In the deep subcritical state, the traditional source multiplication method has the characteristic of low accuracy in the measurement of nuclear reactor reactivity. In order to improve the measurement accuracy, this paper expands CORCA software, develops CORCA-FIX software with fixed source problem solving function and neutron value solving function with discontinuous factor, and uses the comparison program and real reactor data to calculate and verify CORCA-FIX software. The verification results confirm that CORCA-FIX has high accuracy in solving the deep subcritical state of the core with fixed source. After the output results are applied to the real reactor data, better subcritical degree measurement results are obtained, and the deviation criteria of reactivity measurement in engineering applications are met.
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表 1 计算验证建模截面数据
Table 1. Calculate and Validate Modeling Cross Section Data
材料
编号能群
编号扩散系
数/cm吸收截
面/cm−1裂变中子产生
截面/cm−1散射截
面/cm−1不连续
因子1 1 1.5 0.01 0 0.02 1.0 2 0.4 0.08 0.135 0 1.0 2 1 1.5 0.01 0 0.02 1.0 2 0.4 0.09 0.135 0 1.0 3 1 1.5 0.01 0 0.02 1.0 2 0.4 0.13 0.135 0 1.0 4 1 2.0 0 0 0.04 1.0 2 0.3 0.01 0 0 1.0 表 2 三维34×34×38堆芯模型不同收敛判据下迭代次数和最大相对偏差
Table 2. Number of Iterations and Maximum Relative Deviation under Different Convergence Criteria with 3D 34×34×38 Core
收敛判据 10−2 10−3 10−4 10−5 10−6 10−8 10−10 最大相对偏差/% 25.3 1.7 3.45 3.70 3.72 3.73 3.73 迭代次数 101 254 442 636 831 1220 1609 表 3 共轭计算特征值与基模特征值比较
Table 3. Comparison of Conjugate Computed Eigenvalues and Original Eigenvalues
状态 状态1 状态2 状态3 状态4 状态5 基模特征值 0.957190 0.957527 0.954237 0.955258 0.950417 共轭特征值 0.959174 0.959414 0.956883 0.956684 0.951532 表 4 海南昌江核电1号机组第5燃料循环实堆数据验证结果 pcm
Table 4. Validation Results with Real Reactor Data of Hainan Changjiang Nuclear Plant Unit 1 Cycle 5
插入
棒组参考解 传统源倍
增法结果传统源倍
增法偏差改良源倍
增法结果改良源倍
增法偏差A 4395.03 4826.93 431.90 4437.38 42.35 B 4335.12 3715.08 620.04 4401.81 66.69 C 4709.85 3748.75 961.10 4772.16 62.31 D 4614.55 7602.58 2988.03 4581.68 −32.87 S 5149.15 4748.90 400.25 5148.09 −1.07 表 5 海南昌江核电2号机组第5燃料循环实堆数据验证结果 pcm
Table 5. Validation Results with Real Reactor Data of Hainan Changjiang Nuclear Plant Unit 2 Cycle 5 pcm
插入
棒组参考解 传统源倍
增法结果传统源倍
增法偏差改良源倍
增法结果改良源倍
增法偏差A 1835.07 1851.21 16.14 1829.69 5.37 B 2155.48 1570.80 584.68 2212.36 56.88 C 2618.83 1549.80 1069.02 2544.98 73.85 D 2094.99 3431.40 1336.42 2109.13 14.14 S 2665.19 2293.62 371.57 2669.80 4.61 -
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