Erfahrungs- und Forschungsbericht 2012 - Ensi

Erfahrungs- und Forschungsbericht 2012 - Ensi

the types of information and data needed by HRA

practitioners. In a second step, these were related

to different phases or types of training simulator

data collection sessions. For the guideline report

to be completed in 2013, one of the tasks will be

to select or modify the measures and scales for

each data type.

ADS software tool for dynamic event tree analysis

[4]. In the area of HRA data, PSI is establishing a cooperation

with the Korean Atomic Energy Research

Institute (KAERI) on the development of simulator

data collection guidelines. Finally, PSI performed a

peer review of an Idaho National Laboratory report

on simulator data collection for USNRC.

National Cooperation

A Swiss nuclear power plant supported the EOC

pilot study carried out for this project by providing

the PSA, plant procedures, and access to plant

operators and trainers. Observations of crew performance

in the plant’s full-scope training simulator

were performed to provide information about

crew practices in accident scenarios, the application

of procedures, and operator actions in abnormal

scenarios. As noted, the preliminary results

of the EOC pilot study were presented to utility

experts for feedback. They will also review the EOC

study report prior to publication in 2013.

International Cooperation

PSI contributes to the study design and assessments

of the HRA methods in the U.S. HRA Empirical Study,

coordinated by the U.S. Nuclear Regulatory Commission

(USNRC) and the OECD Halden Project under

its Joint Programme, in which Switzerland (ENSI)

is also a member. A diverse set of further partners

on the assessment group and HRA analysis teams

include industry, regulators, and research institutes:

EPRI, Sandia National Laboratories, Idaho National

Laboratory, SAIC, all US; NRI, Czech Rep.

PSI is participating in a task of the OECD NEA/Committee

for the Safety of Nuclear Installations (CSNI),

«Establishing Desirable Attributes of Current Human

Reliability Assessment Techniques In Nuclear

Risk Assessment». This joint task of the Working

Group on Human and Organizational Factors and

the Working Group on Risk Assessment is led by the

U.K. Nuclear Installations Inspectorate. Its aim is an

international technical evaluation of HRA methods,

considering criteria shared by the member countries

and other common criteria. Preliminary evaluations

using the defined criteria were completed in 2012

and reviewed in a task meeting in Nov. 2012.

Work related to crew-plant simulation for safety

assessment is supported by a cooperation with the

University of Maryland (Prof. A. Mosleh), on the

Assessment 2012

and Perspectives for 2013

EOC plant-specific pilot study III

1. Carry out the pilot study, aiming at the assessment

of potential EOC scenarios and their risk significance.

The study was carried out during 2012. Key results

were discussed with the plant personnel to ensure

that the realism of the analyses. The detailed review

of the analysis results and study report by the

plant is planned for early 2013.

Quantification of EOCs

2. Documentation of revised CESA-Q quantification


New inputs for the revision of CESA-q guidance

were produced in 2012: quantification examples

and a taxonomy of generic EOCs that the guidance

should cover. The methodology to build the

mathematical model underlying the revised CE-

SA-Q quantification approach was submitted for

publication in a scientific journal to enhance the

scientific basis of the method. The finalization of

the CESA-Q guidance is planned for 2013. The

qualitative and quantitative analyses of selected

EOCs (from the different pilot studies) will be included

as comprehensive application examples in

the guidance report.

Simulator Data for HRA

and Method Assessment

3. Evaluation of HRA predictions and method assessment

in the U.S. HRA Empirical Study.

The assessments of each analysis team’s HRA predictions

against the reference data based on the

simulator observations were completed in 2011.

In 2012, the intra-method assessments, which

addressed the differences in analyses, resulting

predictions, and method performance between

analysis teams that used the same method were

completed. The final report of the U.S. study as

well as the International HRA Empirical Study will

be published in 2013. The project team prepared


ENSI Erfahrungs- und Forschungsbericht 2012

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