采用MCNP模拟及落棒法刻度CMRR控制棒价值

窦海峰; 李润东; 冷军; 袁姝; 杨鑫; 冯琦杰; 刘晓; 高产

doi:10.11884/HPLPB201830.170345

采用MCNP模拟及落棒法刻度CMRR控制棒价值

doi: 10.11884/HPLPB201830.170345

中国工程物理研究院核物理与化学研究所, 四川绵阳 621900

详细信息

作者简介:
窦海峰(1979－), 男，从事反应堆物理及应用研究；douhaifeng@caep.cn

通讯作者:
冷军(1983－), 男，从事反应堆物理及应用研究；lengjun20130715@caep.cn

中图分类号: TL329.2
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出版历程
- 收稿日期: 2017-09-01
- 修回日期: 2018-01-15
- 刊出日期: 2018-05-15

Benchmarking verification of control rod effects on CMRR using MCNP codes throughout 3D core modeling and rod-drop experiment

Institute of Nuclear Physics and Chemistry, CAEP, P.O.Box 919-211, Mianyang 621900, China

摘要

摘要: 反应堆控制棒是核反应堆紧急控制和功率调节所不可缺少的控制部件，控制棒价值直接关系反应堆的停堆深度。采用MCNP和ORIGEN程序对CMRR反应堆全堆芯三维详细建模计算，并分别利用落棒法、逆动态法对控制棒积分价值、微分价值进行刻度，理论与实验吻合较好。单根安全棒的积分价值约大于4%Δk/k，事故工况下卡一根安全棒的停堆深度仍然大于10%Δk/k，验证了堆芯物理设计，保障了CMRR反应堆的运行安全。
- 控制棒价值 /
- MCNP程序 /
- CMRR /
- 落棒法 /
- 逆动态法
Abstract: In this research, MCNP code and ORIGEN code are used to calculate the control rod reactivity worth effects by simulating the 3D core model of CMRR reactor. The integral and differential behaviors of reactivity worth effects are measured by rod-drop experiments and digital inverse kinetic method with each other. The calculated and measured results are well accorded. The integral reactivity worth of one safety rod is about 4%Δk/k. Even in an accident when one safety rod gets stuck, the CMRR shutdown margin is still greater than 10%Δk/k, and CMRR is totally safe. So the physical design of CMRR is highly reliable and the operation could be safe.
- control rod reactivity worth /
- MCNP code /
- CMRR /
- rod-drop experiments /
- inverse kinetic method

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图 1 调节棒微分价值实验与计算值

Figure 1. Differential value of control rods

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表 1 核燃料原子密度对反应堆有效增值因子(k_eff)的影响

Table 1. Effect on effective multiplication factor(k_eff) of nuclear fuel atomic density

percentage of nuclear fuel nominal value/%	atomic density of nuclear fuel /10²⁴	first criticality	k_eff	standard error
100	0.054 08	0.054 08	1.003 21	0.000 04
102	0.055 16	-	1.006 25	0.000 04
98	0.053 00	-	1.000 16	0.000 04

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表 2 主要物理参数(轻水温度)对反应堆有效增值因子(k_eff)的影响

Table 2. Effect on effective multiplication factor(k_eff) of light water temperature

temperature of light water/℃	atomic density of light water/10²⁴	first criticality	k_eff	standard error
13	0.100 32	0.100 32	1.003 21	0.000 04
20	0.100 20	-	1.002 97	0.000 04
30	0.099 95	-	1.001 99	0.000 04
40	0.099 60	-	1.000 79	0.000 04

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表 3 主要物理参数(重水温度)对反应堆有效增值因子(k_eff)的影响

Table 3. Effect on effective multiplication factor(k_eff) of heavy water temperature

temperature of heavy water/℃	atomic density of heavy water/10²⁴	first criticality	k_eff	standard error
13	0.100 00	0.100 00	1.003 21	0.000 04
20	0.099 86	-	1.003 26	0.000 04
30	0.099 56	-	1.003 20	0.000 04

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表 4 CMRR的带燃耗临界棒位计算结果

Table 4. Critical rod position considering burnup of the fuel element

	rod position in the zero power condition/mm	k_eff calculated with codes MCNP and ORIGEN	standard error
beginning of first core loading	311	1.003 21	0.000 04
end of first core loading	433	1.002 78	0.000 04
beginning of second core loading	350	1.006 03	0.000 04
end of second core loading	448	0.999 46	0.000 04
beginning of third core loading	328	0.998 22	0.000 04

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表 5 首次临界控制棒反应性价值

Table 5. Reactivity worth of control rod in the first critical core

	theoretical value/(Δk/k)	experimental value/(Δk/k)	method
1# safety rod reactivity worth	-0.045 13	—	rod drop
2# safety rod reactivity worth	-0.046 07	—	rod drop
1# safety rod reactivity worth	-0.040 17	-0.039 90	compensation
2# safety rod reactivity worth	-0.038 73	-0.038 30	compensation
1# regulating control rod reactivity worth	-0.031 95	-0.030 81	alternate motion
2# regulating control rod reactivity worth	-0.032 44	-0.031 47	alternate motion

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表 6 第二次换载后落棒法测量控制棒反应性价值实验结果与理论结果

Table 6. Rod value results throughout modeling and rod-drop experiment after the second core loading

	theoretical value/(Δk/k)	experimental value/(Δk/k)
1# safety rod reactivity worth with	0.054 59	0.050 81
2# safety rod reactivity worth with	0.053 55	0.053 06
1#+2# safety rod reactivity worth with	0.139 46	0.132 70
shutdown margin with 2# safety rod stuck	0.151 29	0.108 40
shutdown margin	0.301 67	0.242 60

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参考文献(11)

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