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Recent Case Studies and Advancements in Probabilistic Risk Assessment
Author(s) -
Garrick B. John
Publication year - 1984
Publication title -
risk analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.972
H-Index - 130
eISSN - 1539-6924
pISSN - 0272-4332
DOI - 10.1111/j.1539-6924.1984.tb00946.x
Subject(s) - scope (computer science) , documentation , risk analysis (engineering) , probabilistic risk assessment , risk management , risk assessment , probabilistic logic , presentation (obstetrics) , engineering , risk management tools , computer science , operations research , business , artificial intelligence , computer security , medicine , finance , radiology , programming language
During the period from 1977 to 1984, Pickard, Lowe and Garrick, Inc., had the lead in preparing several full scope probabilistic risk assessments for electric utilities. Five of those studies are discussed from the point of view of advancements and lessons learned. The objective and trend of these studies is toward utilization of the risk models by the plant owners as risk management tools. Advancements that have been made are in presentation and documentation of the PRAs, generation of more understandable plant level information, and improvements in methodology to facilitate technology transfer. Specific areas of advancement are in the treatment of such issues as dependent failures, human interaction, and the uncertainty in the source term. Lessons learned cover a wide spectrum and include the importance of plant specific models for meaningful risk management, the role of external events in risk, the sensitivity of contributors to choice of risk index, and the very important finding that the public risk is extremely small. The future direction of PRA is to establish less dependence on experts for in‐plant application. Computerizing the PRAs such that they can be accessed on line and interactively is the key.