Optimisation of non-destructive testing - Probabilistic Safety Assessment for Optimum Nuclear Power Plant Life Management (PLiM)

Environmental Engineering Reference

In-Depth Information

Actual values and criteria are evaluated using these methods to assess

in terms of structural integrity. In this sense, the ISI with its specific

criteria and performance is in addition to NDT, executed in the period of

manufacture.

A specific criterion is the experience with ISI and received data, which

will form a strong feedback with the majority of positions of the element

B . In this context, it is important to considered unforeseen events affecting

the structural integrity and also how can they be taken into account. For

example, by considering the worst defect situations or the choice of specific

additional areas of the ISI.

Element A is regarded as the actual method of non-destructive testing.

Element B (Fig. 7.4) shows performance of non-destructive testing for

a specific area and indicates a number of reasons.

Non-destructive testing uses criteria that are not only simple but as

informative as possible. When these criteria are considered as indications

in NDT (in terms of ultrasound inspection), then this indication in most

cases is the signal amplitude translated into time corrected again. Another

example of indications is the dynamics of the sound path, etc. In this sense,

the actual size determined by the appropriate method of measurement can

also serve as an indicator. Indications used in eddy-current testing include

Defect