In the domain of probabilistic safety assessment (PSA) application the
most rapidly growing area is the development of living PSA and risk m
onitoring models. Both models are used mainly for operational risk man
agement (ORM) of nuclear power plants (NPPs). This paper summarizes de
finitions and aims, gives examples and makes recommendations for furth
er use and developments. (C) 1997 Elsevier Science S.A.