临港工业区建设对核电厂液态流出物稀释扩散的影响

摘要/Abstract

摘要： 临港工业区建设会导致核电厂取排水口局部潮流场发生变化,影响液态流出物稀释与扩散。以中国北部湾的廉江港为例,采用二维数值模拟计算核电厂2台机组投入运行后,考虑和不考虑临港工业区两种情况下夏季中潮¹³¹I和⁶⁰Co在取排水口附近海域的浓度分布和时空变化。结果表明:临港工业区建设前,¹³¹I和⁶⁰Co主要随潮流运动,¹³¹I和⁶⁰Co稀释10倍的浓度平均值包络面积分别为0.9×10^-3 km²和1.2×10^-3 km²,高浓度区主要分布于排水口所在的安铺湾。临港工业区建设后,潮流场仅在工业区附近发生变化,变化幅度工业区东侧明显大于西侧,并在东侧形成回流区,挑流作用使附近水域的流动减弱,贴近工业区受影响最大,流速、流向均有较明显的改变。¹³¹I和⁶⁰Co稀释10倍的浓度平均值包络面积分别为1.0×10^-3 km²和3.0×10^-3 km²,稀释1 000倍的浓度平均值包络面积分别为109.21 km²和265.41 km²。对比工业区建设前,¹³¹I和⁶⁰Co的高浓度区分别增加了11.1%和150%,而低浓度区分别减小了12.5%和3.2%,说明工业区建设后不利于液态流出物的稀释扩散。计算结果为优化取、排水工程方案、避免出现漫滩排放及局部浓度累积、以及减小液态流出物排放对环境的影响方面提供了技术支撑。

关键词: 廉江港, 液态流出物, 稀释扩散, 数值模拟

Abstract: The construction of the port approaching industrial zone has led to changes in the local tidal field of the water intake and outlet of nuclear power plant,which brings effect to the dilution and diffusion of liquid effluent.Taking Lianjiang Port in the Beibu Gulf of China as an example,by using two-dimensional numerical simulation calculation,the concentration distribution of ¹³¹I and ⁶⁰Co nearby the water intake and outfall during mid-tidal in summer was analyzed,with and without consideration of construction of the zone after the two units of the nuclear power plant went into operation.The results showed that before the construction of the zone,¹³¹I and ⁶⁰Co mainly followed the tidal movement,and the average enveloping area of the concentration of ¹³¹I and ⁶⁰Co diluted by 10 times is 0.9×10^-3 km² and 1.2×10^-3 km² respectively.The high concentration area is mainly distributed in the Anpu Bay where the outfall is.After the construction of the zone,the tidal current field only changed in the vicinity of the industrial zone.The eastward side of the zone was significantly larger than the west side and a recirculation zone was formed on the east side.The flow in the vicinity of the zone is weaker due to the jet flow.The flow close to the industrial zone is affected most,and the flow rate and direction are significantly changed.The average envelope area of the concentration of ¹³¹I and ⁶⁰Co diluted 10 times was 1.0×10^-3 km² and 3.0×10^-3 km² respectively.The average envelope area of the concentration of 1 000 times diluted was 109.21 km² and 265.41 km² respectively.The high concentration zone of ¹³¹I and ⁶⁰Co increased by 11.1% and 150% respectively after the construction,while the low concentration zone decreased by 12.5% and 3.2% respectively,indicating that the industrial zone is not conducive to the dilution and diffusion of liquid effluent.The results will provide reference for optimizing the intake and drainage schemes,avoiding floodplain discharge and local concentration accumulation and providing technical support in reducing the environmental impact of liquid effluent discharge.

Key words: Lianjiang Port, liquid effluent, dilution and diffusion, numerical simulation

中图分类号:

李婷, 朱君, 刘团团, 张艾明. 临港工业区建设对核电厂液态流出物稀释扩散的影响[J]. 辐射防护, 2020, 40(6): 593-604.

LI Ting, ZHU Jun, LIU Tuantuan, ZHANG Aiming. The impact of construction of port approaching industrial zone ondilution and diffusion of liquid effluent from a nuclear power plant[J]. RADIATION PROTECTION, 2020, 40(6): 593-604.

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