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首页> 外文会议>International Conference on Nuclear Engineering >RESEARCH ON OPERATING STRATEGY OF TOTAL LOSS OF ESSENTIAL SERVICE WATER SYSTEM WITH RHR NOT CONNECTED IN PWR UNIT
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RESEARCH ON OPERATING STRATEGY OF TOTAL LOSS OF ESSENTIAL SERVICE WATER SYSTEM WITH RHR NOT CONNECTED IN PWR UNIT

机译：rhr在PWR单元中没有连接的基本维修水系统总丧失的操作策略研究

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摘要

Essential Service Water System (WES) is part of the nuclear power plant cooling system which provides the final heat sink for nuclear power plants. Therefore, WES must operate stably, safely and reliably for a long time. The total loss of WES accident is a design extended condition and will result in the loss of the final heat sink of the unit. The consequences of the accident are severe. In order to deal with the accident quickly and effectively and ensure the safety and economics of the power plant in accident condition, it's necessary to formulate corresponding treatment strategy to deal with the transient. This paper developed a strategy for dealing with the total loss of WES with Residual Heat Removal System (RHR) not connected condition in Generation Ⅲ nuclear power plant. The structure of the WES system and the types of failures that may occur are analyzed, and thus the symptoms of the faults are obtained and the entry conditions for the operating strategy are determined. The effect of faults on unit equipment and safety functions and the impact on nuclear steam supply system (NSSS) control are analyzed in this paper. Combined with the unit design, the system and equipment for controlling and mitigating related safety functions are analyzed, and the mitigation method and the fallback strategy of the fault are determined. Thereby a complete operating strategy of total loss of WES with RHR not connected is obtained. In addition, this paper analyzes and evaluates the operating strategy by simulating thermal hydraulic calculation for the first time. The results show that without staff intervention Component Cooling System (WCC) temperature reached 55°C limits after running a few minutes. Based on the intervention of the operating strategy proposed in this paper, WCC temperature reached the 55°C limits when the unit was operated at about 4 hours and 55 minutes. The result shows that and the strategy can effectively alleviate the failure and provide sufficient intervention time for the operator to bring the unit to a safe state.
机译：基本维修水系统（WES）是核电站冷却系统的一部分，为核电厂提供最终散热器。因此，WES必须长时间稳定，安全可靠地操作。 WES事故的总损失是设计延长条件，将导致该单元的最终散热器损失。事故的后果严重。为了快速有效地处理事故，并确保电厂在事故条件下的安全性和经济性，有必要制定相应的治疗策略来处理瞬态。本文制定了一种处理Ⅲ型核电站的残留散热系统（RHR）的剩余散热系统（RHR）的总损失的策略。分析了WES系统的结构和可能发生的故障类型，因此获得了故障的症状，并且确定了操作策略的进入条件。本文分析了故障对单位设备和安全功能的影响以及对核蒸汽供应系统（NSSS）控制的影响。结合单位设计，分析了用于控制和减轻相关安全功能的系统和设备，并确定了断层的缓解方法和后退策略。由此，获得了未连接的RHR的WES总损失的完整操作策略。此外，本文通过第一次模拟热液压计算来分析和评估操作策略。结果表明，没有员工干预组件冷却系统（WCC）温度达到几分钟后达到55°C的限制。根据本文提出的操作策略的干预，当该装置在约4小时和55分钟时，WCC温度达到55°C的限制。结果表明，该策略可以有效地减轻失败并为运营商提供足够的干预时间，使单位带到安全状态。

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