3) ASSESSMENT AND INSPECTION OF
Supervisory activity of UJD
upon the safety of nuclear installations in compliance with the “Atomic Act” and other
legal regulations includes inspection and assessment activities of UJD.
The assessment activity of UJD in relation to nuclear installation lies in assessment of
safety documentation for constructions realised as nuclear installations, or construction
through which changes on nuclear installations are realised. The scope of safety
documentation required for the assessment is stipulated by the Atomic Act. The assessment
activity of UJD in 2001 was focused on National Repository of Radwaste (RU RAO) in
Mochovce, on radwaste conditioning and treatment technology (BSC RAO) in Jaslovské
Bohunice and on the assessment of documentation for the project of modernisation of
Bohunice V-2 NPPs which is under preparation.
View of the Bohunice NPPs site
Activities of UJD had been
mainly focused on review and assessment of design modifications, quality assurance
programmes, changes in limits and conditions (LaP), operating procedures, changes in
programmes of periodical testing of equipment important in terms of nuclear safety and
changes in physical protection of nuclear facilities.
Significant activities of UJD include the evaluation of maintaining limits and conditions
of safe operation, the evaluation of operational safety performance indicators and
evaluation of the results of inspection activities.
The assessment of nuclear installation operational safety based on the assessment of
operational events is a separate category in the assessment activity of UJD. The UJD
decree on events at nuclear facilities which establishes a systematic approach to event
categorising, reporting and finding out their causes and to informing public on events is
the basic regulation document for performing of these activities
The assessment of the technical condition of equipment, important in terms of nuclear
safety, primarily based on results of in-service inspections and surveillance testing of
safety related components and systems, is also a part of the safety assessment of nuclear
installation operation. The assessment activity of UJD in 2001 was also targeted to
applicants for authorisation in compliance with the “Atomic Act”.
The professional capability of applicant was verified in terms of:
equipment of the applicant
equipment for measuring or testing, including inspections of meeting requirements
specified by metrology procedures
development of implementation documentation, for assurance of technology discipline in
manufacturing including welding and thermal treatment, technical control and testing after
completion of manufacturing (mounting)
assurance system determining system approaches (including responsibility) to the above
The operators in compliance
with the formerly issued decisions of UJD ensure, after each fuel campaign, the assessment
of residual service life of the essential technology equipment of reactor units. The
assessment is performed in terms of low cycle (high deformation) fatigue and of the
reactor vessel embrittlement. Based on the assessment of the evaluation documents
submitted by the operator, it can be stated that fatigue service life time of equipment
and also the values of critical temperature of brittleness of the reactor material are
favourable and the safe operation of reactor units is assured. Within a framework of
refuelling outage of reactor units the assessment activity of UJD was also focused on
realisation of the programme of a systematic improvement of tightness of confinement.
Through the implementation of this programme the improvement of tightness parameters of
the confinement on operating reactor units was achieved also in 2001.
Inspection activity specified in the “Atomic Act” is governed by an internal
guideline, an important part of which is in the annual inspection plan. In compliance with
the “Atomic Act” the UJD personnel perform also inspections during construction,
modernisation, repair and maintenance of nuclear facilities. Inspection activity of UJD
has been performed by nuclear safety inspectors, most of them have a long years experience
in competent fields. The inspectors take part in training courses and participate in other
technical meetings and workshops organised by the IAEA and also take part in special
training courses organised by the Nuclear Authorities of European countries, USA and
Unplanned inspections are evoked by unexpected operational events on
nuclear installations, or the regulator responds by them to the occurred situation in the
organisation under supervision.