严重事故专用卸压阀排放能力需求

武铃珺; 邓坚; 张航; 王小吉; 刘丽莉; 青涛

doi:10.11884/HPLPB202133.210062

严重事故专用卸压阀排放能力需求

doi: 10.11884/HPLPB202133.210062

中国核动力研究设计院核反应堆系统设计技术重点实验室，成都 610213

详细信息

作者简介:
武铃珺（1982—），女，高级工程师，现主要从事严重事故及概率安全评价研究工作

通讯作者:
邓　坚（1981—），男，博士，高级工程师，现主要从事反应堆热工水力分析及严重事故策略研究工作

中图分类号: TL364
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出版历程
- 收稿日期: 2021-03-01
- 修回日期: 2020-04-21
- 网络出版日期: 2021-05-06
- 刊出日期: 2021-07-15

Discharge capacity requirements of severe accident depressurization valves

Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213, China

摘要

摘要: 二代加百万千万级核电站严重事故下卸压过程中高温流体流经卸压阀，可能造成流道变形，甚至造成阀杆下落使得排放流道封闭，造成卸压失败。对严重事故专用卸压阀在卸压过程中可能经历的高温流体状态进行谱分析，获得了不同卸压能力下阀门经受的高温流体状态。开展了高温可能引起的阀门流道变形对卸压效果的影响分析。第二类阀门虽然存在阀门流道变形的可能，但能够获得较长严重事故处置时间，从优化严重事故对策的角度，严重事故专用卸压阀推荐采用第二类阀门排放能力450～600 t/h范围。
- 高压熔堆 /
- 熔融物喷射 /
- 反应堆冷却剂系统卸压 /
- 严重事故卸压阀 /
- 高温流体
Abstract: In the process of depressurization during severe accidents for the second generation nuclear power plant, high temperature fluid flowing through the severe accident depressurization valves may cause deformation of the valve body or even cause the valve stem to fall down because of being heated by high temperature fluid, resulting in depressurization failure. In this paper, the spectrum analysis of the high temperature fluid state that the depressurization valve may experience in the process of pressure relief is carried out, and the high temperature fluid state under different pressure relief capacities is obtained. The influence of the valve channel deformation caused by high temperature on the depressurization effect is studied. Although the second type valve has the possibility of valve channel deformation, it can obtain a longer time window for severe accident mitigation. From the perspective of optimizing the severe accident measures, the discharge capacity range of the second type valve 450-600 t/h is recommended.
- high pressure core-meltdown /
- melt ejection /
- reactor coolant system depressurization /
- severe accident depressurization valves /
- high temperature liquid

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图 1 稳压器出口温度（第一类排量）

Figure 1. Temperature of pressurizer outlet (type 1)

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图 2 稳压器出口温度（第二类排量）

Figure 2. Temperature of pressurizer outlet (type 2)

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图 3 稳压器出口温度（第三类排量）

Figure 3. Temperature of pressurizer outlet (type 3)

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图 4 稳压器出口温度（第四类排量）

Figure 4. Temperature of pressurizeroutlet (type 4)

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图 5 RPV压力

Figure 5. RPV pressure

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图 6 稳压器水位

Figure 6. Pressurizer water level

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图 7 堆芯出口温度

Figure 7. Temperature of core outlet

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图 8 堆芯活性段水位

Figure 8. Core active zone water level

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图 9 RPV压力（工况1-1/2/3/4）

Figure 9. RPV pressure (case 1-1/2/3/4)

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图 10 RPV压力（工况1-5/6/7/8）

Figure 10. RPV pressure (case 1-5/6/7/8)

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图 11 RPV压力（工况2-1/2/3/4）

Figure 11. RPV pressure (case 2-1/2/3/4)

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图 12 RPV压力（工况4-1/2/3/4）

Figure 12. RPV pressure (case 4-1/2/3/4)

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表 1 事故主要进程时间节点

Table 1. Accident process of depressurization

case	time/s					pressure/MPa
case	open valves: T_out （reactor is 50 ℃）	accumulator injection	pressurizer drain	accumulator drain	T_out of pressurizer ≥1000 ℃	RPV lower head failure	RPV lower head failure
case 1-0: 350 t/h	5750	6515	6575	12825	6625/18605	20925	1.39
case 2-0: 450 t/h	5750	6350	6550	12600	18145	18800	0.78
case 3-0: 600 t/h	5750	6200	—	6750	—	15425	0.99
case 4-0: 1000 t/h	5750	6000	12375	6500	12410	14000	0.90

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表 2 事故主要进程时间节点（阀门开启初期发生流道变形）

Table 2. Accident process of depressurization with valve channel deformation

valve channel deformation（350 t/h：6625 s）	time/s		pressure/MPa
valve channel deformation（350 t/h：6625 s）	accumulator drain	RPV lower head failure	RPV lower head failure
case 1-1：25%	15565	22300	1.35
case 1-2：50%	15980	26650	2.32
case 1-3：75%	21050	31700	4.14
case 1-4：90%	—	13300	7.62

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表 3 事故主要进程时间节点（事故后期发生流道变形）

Table 3. Accident process of depressurization (with late valve channel deformation)

	valve channel deformation	time /s	pressure/MPa
350 t/h：18605	case 1-5：25%	19400	1.27
	case 1-6：50%	19410	1.56
	case 1-7：75%	19415	2.04
	case 1-8：90%	19400	2.51
450 t/h：18145	case 2-1：25%	18875	0.91
	case 2-2：50%	18880	1.11
	case 2-3：75%	18865	1.45
	case 2-4：90%	18890	1.93
1000 t/h 13010	case 4-1：25%	14000	1.52
	case 4-2：50%	14075	2.51
	case 4-3：75%	14150	3.82
	case 4-4：90%	14000	4.78

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