标准编号：ISO 11231:2019
中文名称：航天系统 随机风险评估（PRA）
英文名称：Space systems — Probabilistic risk assessment (PRA)
发布日期：2019-05
标准范围
This document supports and complements the implementation of the risk management process defined
in ISO 17666 in situations when the application of a quantitative risk assessment is deemed necessary.
This document defines the principles, process, implementation and requirements for conducting a
quantitative risk assessment and explains the details of probabilistic risk assessment (PRA) as applied
to safety. While PRA can be applied to project risk management involving cost and schedule, this
application is outside the scope of this document.
This document provides the basic requirements and procedures for the use of PRA techniques to assess
safety or mission risk and success in space programmes and projects. This document is applicable to all
international space projects involving:
— the design of space vehicles for the transportation of personnel in space;
— the design of space and non-terrestrial planetary stations inhabited by human beings;
— the design of space and launch vehicles powered by, or carrying, nuclear materials;
— other projects as directed by the authorities or clients.
These types of projects generally involve scenarios, chains of events or activities that could result in the
death of, or serious injury to, members of the public, astronauts or pilots, or the workforce, or the loss
of critical or high-value equipment and property. For other types of projects, it is intended that PRA be
performed at the discretion of the project management.
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