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在核电厂的安全研究中，通常着重研究核电厂带功率运行下的瞬态和事故，而对停堆工况下的安全问题研究较少。许多事故后的操作规程也只适用于带功率运行工况或热停堆工况和过渡停堆工况，而不能应用到余热排出系统接入之后的冷停堆工况。近年来，核电厂停堆工况下发生了几起典
In nuclear power plant safety research, it is usually focused on the transient and accidental operation of the power plant with nuclear power plants, while less research is done on the safety problems under shutdown conditions. Many post-accident operating procedures apply only to power operating conditions or thermal shutdown and transitional shutdown conditions and not to cold shutdown conditions after the residual heat removal system is accessed. In recent years, nuclear power plant shutdown conditions occurred several Codex