Abstract In order to reduce risks from the Steam Generator Tube Rupture (SGTR) accident and to meet safety targets, various measures have been analyzed to minimize the amount of fission product (FP) release. In this paper, we propose an introduction of a Containment Filtered Venting System (CFVS) connected to the steam generator secondary side, which can reduce the amount of FP release while minimizing adverse effects identified in the previous studies. In order to compare the effect of new equipment with the existing strategy, accident simulations using MELCOR were performed. As a result of simulations, it is confirmed that CFVS operation lowers FP release into the environment, and the release fractions are lower (minimum 0.6% of the initial inventory for Cs) than that of the strategy which intends to depressurize the primary system directly (minimum 15.2% for Cs). The sensitivity analyses identify that refill of the CFVS vessel is a dominant contributor reducing the amount of FP released. As the new strategy has the possibility of hydrogen combustion and detonation in CFVS, the installation of an igniter inside the CFVS vessel may be considered in reducing such hydrogen risk.

中文翻译：

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基于CFVS的SGTR事故裂变产物减量策略分析

摘要 为了降低蒸汽发生器管破裂（SGTR）事故的风险并满足安全目标，分析了各种措施以尽量减少裂变产物（FP）的释放量。在本文中，我们建议引入连接到蒸汽发生器二次侧的密闭过滤通风系统 (CFVS)，它可以减少 FP 释放量，同时最大限度地减少先前研究中发现的不利影响。为了比较新设备与现有策略的影响，使用 MELCOR 进行了事故模拟。作为模拟的结果，证实 CFVS 操作降低了 FP 释放到环境中，并且释放分数较低（最小 0. Cs 初始存量的 6%）比打算直接对初级系统减压的策略（Cs 最少 15.2%）。敏感性分析确定 CFVS 容器的再填充是减少 FP 释放量的主要因素。由于新策略有可能在 CFVS 中发生氢气燃烧和爆炸，因此可以考虑在 CFVS 容器内安装点火器以降低此类氢气风险。