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An ingenious method has been discussed to provide a brief way for the derivation of the streaming term expression in the spherical geometry coordinate system. Instead of finding the differential relationship between the dihedral angle and the neutron transport distance, finding the geometry relationship between the dihedral angle and other plane angles is much easier. And then the differential relationship (easy to be derived) between the other plane angles and the neutron transport distance can be used to derive the expression of the streaming term in the spherical geometry coordinate system indirectly but easily. This method makes the derivation process easy and intuitive, with clear physical picture. 相似文献
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应急柴油发电机(EDG)作为核电厂重要安全设备,主要用于应对丧失厂外电事故。为确保EDG的可靠性,应制定维修计划并定期进行各种预防性维修。鉴于EDG维修时间较长,应考虑由于维修造成的不可用给“华龙一号”核电厂带来额外的安全风险,这成为“华龙一号”核电厂EDG数量配置的重要考虑因素之一。根据最新的核安全要求,将导出乏燃料贮存设施所贮存燃料的热量上升为基本安全功能,相比于国内的二代堆型,“华龙一号”考虑了乏池冷却相关设计基准工况,这直接导致2×100%EDG配置方案难以找到合适的EDG维修窗口。本论文的主要目的就是利用确定论和概率论安全分析方法对EDG的维修窗口进行详细分析,另辟蹊径为EDG提供允许维修时间。分析结果表明,2×100%配置下EDG允许维修时间能够满足维修实际需要。因此,HPR1000采用2台应急柴油发电机的配置方案下能够开展维修。 相似文献
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