Environmental Engineering Reference
In-Depth Information
8.5
Plant programmes credited for long-term
operation
Review of the existing plant programmes can qualify these programmes as
adequate for ageing management. For example, the following programmes
can be classifi ed as AMPs or part of AMP:
Preventive and predictive maintenance programme can be considered
to be a part of AMP because it is one of the solutions for ageing mitiga-
tion and because AM requires information on preventive maintenance
of SCs that is carried out
In-service inspection programme
Functional Testing Programme - for active components if they are in the
scope of AM.
8.5.1 Review and modifi cation of the ISI programmes
The in-service inspection (ISI) programmes delivered partly by the sup-
plier or developed by Hungarian institutes basically follow the ex-Soviet
regulation.
Recent review and overall updating of the ISI programmes adopt
state-of-the-art techniques and methodologies (e.g. ASME Section XI).
Extensive studies are ongoing to provide a solid basis for changing the
rules and techniques of ISI. One practical question is the periodicity of
the ISI programmes, which is four years at Paks NPP, in accordance to the
ex-Soviet regulation. For practical reasons the new ISI period should be
eight years. At the same time, the scope and depth of ISI programmes also
have to be upgraded. This type of modifi cation is not unique; moreover
there are similar examples among the countries operating VVER-440 type
NPPs (e.g. Finland); however, the change cannot be performed routinely, it
requires careful justifi cation.
8.5.2 Maintenance programmes
Maintenance is the subject of Maintenance Effectiveness Monitoring
(MEM), the purpose of which is to control the effectiveness of maintenance
on SSCs ensuring they are capable of performing their intended functions.
This means ensuring that safety-related SSCs are capable of performing
their intended functions; that failures of certain non-safety-related SSCs
that could affect safety-related functions will not occur; and failures that
could result in scrams or unnecessary actuations of safety-related systems
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