The value of upgrading the HRA method
Por:
Nelson P.F.
Publicada:
1 ene 2011
Resumen:
Human Reliability Analysis (HRA) is a very important part of Probabilistic Risk Analysis (PRA), and constant work is dedicated to improving methods, guidance and data in order to approach realism in the results as well as reducing uncertainties. In order to advance in these areas, several HRA studies are being performed globally. Mexico has participated in the recent HRA Empirical studies with the objective of "benchmarking" HRA methods by comparing HRA predictions to actual crew performance in a simulator. The experience of participating in these efforts is being incorporated in the updating of the Laguna Verde PRA to comply with the ASME/ANS PRA standard. In order to be considered an HRA with technical adequacy for PRA risk-informed applications, the methodology used for the HRA in the original PRA is not considered sufficiently detailed, and the methodology had to upgraded. The HCR/CBDT/THERP method was chosen, since this is used in many nuclear plants with similar design. The HRA update includes the evaluation of human errors that can occur during an accident, known as post initiating events. Due to the results, it does not appear to be necessary to use a more detailed existing HRA method for the quantification of the human error probabilities; however, there is room for qualitative assessment enhancement. It is also expected that if new methods are employed with new data, there could be advances in the quantitative HRA predictions as well.
Filiaciones:
Nelson P.F.:
Departamento de Sistemas Energéticos, Facultad de Ingeniería, Universidad Nacional Autónoma de México, Mexico DF, CP 04510, Mexico
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