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首页> 外文会议>Proceedings of the international topical meeting on advanced reactors safety >Overpressure in a CANDU Containment Due to Hydrogen Deflagration
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Overpressure in a CANDU Containment Due to Hydrogen Deflagration

机译：由于氢气爆燃，CANDU安全壳中的超压

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During a severe accident, hydrogen can be released into the containment. If a flammable mixture forms and burns, it may pose a challenge to containment integrity. To prevent damaging burns from occurring, a hydrogen ignition system is installed to deliberately burn the mixture near the flammability limit, before a sensitive mixture can arise. To demonstrate that the installed hydrogen mitigation system will prevent damaging burns, a lumped-parameter burn model is used to calculate the peak pressure rise.rnThis paper presents the results of the overpressure due to hydrogen deflagration in a CANDU containment by means of a.structural criterion curve which defines the envelope of non-damaging burns. This curve is used to establish a composition criterion for determining if a particular combustible hydrogen-air-steam composition will result in overpressures that can cause through-wall-cracking of the concrete structures in containment.rnThe lumped-parameter burn model in the GOTHIC computer code was used for the calculations. In the calculations, hydrogen was assumed to be released into one of the six interconnected auxiliary rooms in a CANDU containment. Because of the complex geometry, and because the hydrogen-air-steam mixture is not completely mixed during the time when hydrogen is being released from the break, all six rooms were assumed to have the same uniformly mixed hydrogen-air-steam composition.rnValidation of the burn model was described in a previous study by showing comparisons with experiments which involve the induced turbulence effects of venting and of obstacles. It has been found that twice the default flame speed provides peak pressure predictions comparable to experimental measurements for geometries of low to medium obstacle density. This ensures that the calculations of peak pressure in containment are conservative for mixtures of relevance to the deliberate ignition strategy for hydrogen mitigation, when applied to complex geometries.
机译：在严重事故中，氢气可以释放到安全壳中。如果形成易燃混合物并燃烧，可能会对安全壳的完整性构成挑战。为防止发生有害的燃烧，在产生敏感混合物之前，安装了氢气点火系统，在可燃极限附近故意燃烧混合物。为了证明已安装的氢气缓解系统将防止有害的燃烧，使用集总参数燃烧模型来计算峰值压力升高.rn本文通过结构化方法介绍了CANDU密闭容器中氢气爆燃引起的超压结果。定义非破坏性烧伤包络的标准曲线。该曲线用于建立成分标准，以确定特定的可燃氢-空气-蒸气成分是否会导致超压，从而导致安全壳内混凝土结构的全壁开裂.rn GOTHIC计算机中的集总参数燃烧模型代码用于计算。在计算中，假设氢气被释放到CANDU密闭空间的六个相互连接的辅助室之一中。由于复杂的几何形状，并且由于在氢气从断裂处释放时氢气-蒸汽-蒸汽混合物没有完全混合，因此假设所有六个房间均具有相同的均匀混合的氢气-蒸汽-蒸汽组成。在先前的研究中，通过与实验进行了比较，对燃烧模型的描述进行了比较，这些实验涉及排气和障碍物引起的湍流效应。已经发现，对于低至中等障碍物密度的几何形状，默认火焰速度的两倍可提供与实验测量结果相当的峰值压力预测。这确保了在应用于复杂几何形状时，对于与故意缓解氢气的点火策略相关的混合气体，安全壳内峰值压力的计算是保守的。

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