4. ASSESSMENT AND INSPECTION OF NUCLEAR INSTALLATIONS
Supervisory activity of UJD over the safety of nuclear installations in compliance with the "Atomic Act "and other legal regulations includes also inspection and assessment activities of UJD.
Assessment activity of UJD in relation to nuclear installations lies in assessment of safety documentation for constructions realized as nuclear installations, or constructions through which changes are realized on nuclear installations. The scope of safety documentation required for the assessment is stipulated in the Atomic Act. In 1999 the assessment activity focused on newly constructed nuclear installations or their parts - Unit 2 of NPP Mochovce, National Repository of radwaste in Mochovce, And the first phase of technology for treatment and conditioning of radwaste in Jaslovské Bohunice. Significant project of UJD was also assessment of nuclear safety after completing the Program of gradual reconstruction of Unit 2 of NPP V-1 Bohunice, or also assessment of reconstruction of the Interim storage of spent fuel in Jaslovské Bohunice. Activities of UJD in assessment focused mainly on control of meeting both general and specific requirements for nuclear safety, assessment of commissioning programs, operating procedures, limits and conditions, etc.
In compliance with the "Atomic Act ", significant part of the assessment activity of UJD is assessment of changes, which influence nuclear safety of nuclear installations in operation, realization of which is conditioned by the approval from UJD. It is mainly assessment of significantly high number of design changes, changes in limits and conditions, operating procedures, changes in programs of periodical testing of equipment important with respect to nuclear safety, changes in physical protection of nuclear equipment, etc.
A separate category in the assessment activity of UJD is also assessment of the operational safety of nuclear installations for last year. In compliance with common international practice, this activity is based on assessment of operational events, keeping limits and conditions of safe operation and assessment of safety indicators of the operation. Part of this safety assessment of operation of nuclear installations for last year is also assessment of the technical condition of equipment important from the aspect of nuclear safety, primarily based on results from in-service inspections, periodical testing of systems important from the safety aspect.
Assessment activity of UJD in 1999 focused also on applicants for authorization in compliance with the "Atomic Act ".
Professional eligibility of applicants was verified from the aspect of:
- technical equipment of the applicant
- instrumentation equipment for metering or testing, including inspection of adherence to requirements of metrology regulations
- personnel for processing implementation documentation, as-built documentation, for realization of technology, including technology of welding and thermal treatment; technical control; for civil, pressure and individual testing
- quality system determining system approaches (including responsibility) to the above-listed activities
Inspection activity specified in the "Atomic Act "is governed by internal guideline, an important part of which is an annual inspection plan that considers the following types of inspections:
Routine inspections performed mainly by site inspectors. The site inspector at the relevant nuclear installation controls adherence to conditions and requirements of nuclear safety. He makes inspections mainly of the technical condition of nuclear installations, performing periodical testing of equipment important with respect to nuclear safety, meeting approved limits and conditions, selected operating procedures and programs of quality assurance during construction and commissioning, operation and maintenance, As well as in decommissioning of nuclear installations.
Special inspections focus on narrow profession areas (such as fire safety, qualification and training of NPP personnel, etc.) , especially control of meeting specific requirements of nuclear safety.
Team inspections focus on complex inspection of safety of the relevant nuclear installation and usually these are done parallel in several professional areas. Typical example of a team inspection is inspection of readiness of the nuclear installation for the individual phases of commissioning. This is control of meeting conditions given by UJD to the licensee to operate the nuclear power plant for issuing an approval to start up the unit after refueling. Team inspections during operation are normally oriented to the areas, which are set based on long-term evaluation of results of nuclear installation's operator.
Extraordinary inspections are unplanned, evoked by unexpected operational events on nuclear installations, or the regulator responds by them to the situation in the organization under supervision. In compliance with the "Atomic Act "UJD performs inspections also during construction, reconstruction, repairs and maintenance of nuclear installations in a form of participation of the UJD inspectors at construction testing, selected equipment completed from the assembly point of view, as well as hydro tests of mechanical parts of selected equipment. Inspection activity of UJD has been performed by nuclear safety inspectors, majority of them have long-term experience in the relevant area. From these inspections the inspectors write a nuclear safety protocol stating the findings. This protocol also contains orders and measures imposed by UJD to remove the shortcomings found. Qualification of nuclear safety inspectors is secured according to the internal guideline of UJD. Inspectors take part not only in training courses and other technical meetings organized by the IAEA, but also special training courses organized in co-operation with nuclear safety regulators from European countries, USA, Canada and Japan.