首页> 外文期刊>Nuclear Engineering and Design >The impact of design on the decay heat removal capabilities of a modular pebble bed HTR
【24h】

The impact of design on the decay heat removal capabilities of a modular pebble bed HTR

机译:设计对模块化卵石床HTR的衰减除热能力的影响

获取原文
获取原文并翻译 | 示例
       

摘要

The decay heat removal capabilities are an important safety feature of the modular pebble bed HTR. It is designed in a way that also during loss of cooling accidents the decay heat can be removed purely by passive means without exceeding predefined temperature limits for fuel and structures. Such a plant design, however, yields limitations on the power output. Thus, from the thermal hydraulic point of view a reactor with maximum power which still obeys the temperature limits of fuel and components, represents an optimal design of a modular pebble bed HTR. In this paper, design options for a modular pebble bed HTR are discussed with respect to their capabilities of decay heat removal. Both pressurized and depressurized loss of coolant accidents are investigated. Optimization of design features is considered with reference not only to the maximum fuel temperature during the accidents, but also to the temperature of structures, mainly that of the reactor pressure vessel. It is pointed out that annular cores can produce higher power without exceeding fuel temperature limits, especially during depressurization accidents. This is mainly due to geometrical effects. Heat storage effects of the inner column also have an influence on the maximum fuel temperature by increasing the time at which this temperature is reached. While a thermal insulation of the core and the reflector increases the fuel temperature, maximum temperature of the pressure vessel and the core barrel is decreased. Thus, carbon blocks represent an important element for optimization of the design.
机译:衰减排热功能是模块化卵石床HTR的重要安全功能。它的设计方式是,即使在冷却事故损失期间,也可以通过被动方式纯粹消除衰变热,而不会超出燃料和结构的预定温度限制。但是,这种设备设计会限制功率输出。因此,从热液压观点来看,具有最大功率但仍遵守燃料和部件的温度极限的反应堆代表了模块化卵石床HTR的最佳设计。在本文中,针对模块化卵石床HTR的衰减除热能力进行了讨论。研究了加压和减压损失的冷却剂事故。设计特征的优化不仅要考虑事故期间的最高燃料温度,还要考虑结构的温度,主要是反应堆压力容器的温度。要指出的是,环形铁芯可以产生更高的功率而不会超过燃料温度极限,特别是在减压事故期间。这主要是由于几何效应。内柱的储热效果还会通过增加达到该温度的时间来影响最高燃料温度。当芯和反射器的绝热提高燃料温度时,压力容器和芯筒的最高温度降低。因此,碳块代表了优化设计的重要元素。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号