A13-2-7 The pre-operational test programme

The initial test programme concerns a particularly delicate phase in the plant life, in which possible design or construction deficiencies usually come to the open. 

The test programme comprises two phases nonnuclear (before fuel loading) and nuclear. The tests are often termed pre-operational and nuclear , respectively. 

In the pre-operational tests, components and systems are tested. Integrated tests of several interacting systems are performed too. Therefore, the functional consistency of the systems to the design is verified, as well as the absence of vibrations, normal operation in general and the normal expansion and contraction of systems while they heat up and cool down, etc. 

It is very desirable that operating personnel directly take part in the pre-operational tests, together with the representatives of the contractors, in order to get used to the plant components. 

It is not usually considered necessary that the pre-operational tests programme is explicitly approved by the safety control body, but its contents, time schedule and results are, however, timely communicated to it. On the other hand, the nuclear tests programme must have prior approval because it must fully demonstration the safety characteristics of the plant and because, whilst it is being carried out, the risk of accidents involving radioactive products starts. 

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