Application of Containment and Release Management Strategies to PWR Dry-Containment Plants

摘要

The report identifies and evaluates accident management strategies that are potentially of value in maintaining containment integrity and controlling the release of radioactivity following a severe accident at a pressurized water reactor with large-dry containment. The strategies are identified using a logic tree structure leading from the safety objectives and safety functions, through the mechanisms that challenge these safety functions, to the strategies. The strategies are applied to severe accident sequences which have one or more of the following characteristics: significant probability of core damage, high consequences, give rise to a number of potential challenges, and include the failure of important safety systems. Zion and Surry are selected as the representative plants for the atmospheric and sub-atmospheric designs, respectively.