常规岛主厂房第一跨内主给水破管泄漏水量计算分析

Calculation and Analysis of Water Leakage from Main Water Supply Broken Pipe in the First Span of Main Plant on Conventional Island

按照纵深防御的要求,在第一跨发生主给水管道双端破裂的情况下,第一跨防水淹设计基准是保证布置在第一跨的CCS泵组功能不会因为水淹工况而丧失。常规岛设计方须按照核岛设计方提供的边界条件,开展第一跨主给水管道破裂泄放流量和水量计算。本文以核岛提资及常规岛给水泵、除氧器、凝汽器等关键设备的出力、容积等设计和运行参数作为输入资料,确定第一跨发生主给水管道破裂的边界条件,明确第一跨防水淹的设计基准及主给水破管的极限工况;按照主给水管道破裂工况下的核岛和常规岛响应过程,采用分阶段计算的方式对第一跨内主给水管道不同破裂程度下可能出现的瞬态最大泄放水量和总泄放水量进行模拟计算。本计算结果为常规岛主厂房第一跨防水淹分析提供数据基础,为AP1000及后续电厂的第一跨防水淹设计提供数据支撑。

According to the requirements of depth defense, in the case of two-end rupture of the main water supply pipeline in the first span, the waterproofing and flooding design standard of the first span is to ensure that the functions of CCS pump set arranged in the first span will not be lost due to water flooding. The designer of conventional island shall, according to the boundary conditions provided by the designer of nuclear island, carries out calculation on the discharge and water volume of the rupture of the main water supply pipeline of the first span. In this paper, the output, volume and other design and operation parameters of the key equipment such as the feedwater pump, deaerator and condenser on the nuclear and conventional islands are taken as input data to determine the boundary conditions for the rupture of the main feed water pipeline at the first span, and the design basis for waterlogging and flooding at the first span and the limit working conditions of the main feed water pipeline. According to the nuclear island and conventional island response process of the main water supply pipeline under the condition of rupture, the transient maximum discharge and total discharge of the main water supply pipeline in the first span under different rupture degrees are simulated and calculated by stage calculation. The calculation results in this report provide a data basis for the analysis of waterproofing and waterproofing of the first span of the main plant of the conventional island, and provide data support for the waterproofing and waterproofing design of the first span of the AP1000 and subsequent power plants.