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Extra info for Safety Assessment and Verification for Nuclear Powerplants (IAEA NS-G-1.2)

Example text

The results of the safety analysis will ensure with a high level of confidence that the plant will perform as designed and that it will meet all design acceptance criteria at commissioning and over the life of the plant. 17. The achievement of a high level of safety should be demonstrated primarily in a deterministic way. However, the safety analysis should incorporate both deterministic and probabilistic approaches. These approaches have been shown to complement each other and both should be used in the decision making process on the safety and ability of the plant to be licensed.

Bearing in mind these shortcomings and the current maturity of best estimate codes, they should be used in a safety analysis in combination with a reasonably conservative selection of input data and a sufficient evaluation of the uncertainties of the results. 90. It may also be acceptable to use a combination of a best estimate computer code and realistic assumptions on initial and boundary conditions. Such an approach should be based on statistically combined uncertainties for plant conditions and code models to establish, with a specified high probability, that the calculated results do not exceed the acceptance criteria.

4. 1. The aim of the safety analysis should be by means of appropriate analytical tools to establish and confirm the design basis for the items important to safety, and to ensure that the overall plant design is capable of meeting the prescribed and acceptable limits for radiation doses and releases for each plant condition category. The design, manufacture, construction and commissioning should be integrated with the safety analysis to ensure that the design intent has been incorporated into the as-built plant.

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