An approach for assessing human descision relability

Pekka Pyy

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)


This paper presents a method to study human reliability in decision situations related to nuclear power plant disturbances. Decisions often play a significant role in handling of emergency situations. The method may be applied to probabilistic safety assessments (PSAs) in cases where decision making is an important dimension of an accident sequence. Such situations are frequent e.g. in accident management. In this paper, a modelling approach for decision reliability studies is first proposed. Then, a case study with two decision situations with relatively different characteristics is presented. Qualitative and quantitative findings of the study are discussed. In very simple decision cases with time pressure, time reliability correlation proved out to be a feasible reliability modelling method. In all other decision situations, more advanced probabilistic decision models have to be used. Finally, decision probability assessment by using simulator run results and expert judgement is presented.
Original languageEnglish
Pages (from-to)17-28
JournalReliability Engineering and System Safety
Issue number1
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed


  • human reliability analysis
  • nuclear power plants
  • simulator studies
  • decision making


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