Summary Report for Conduct of Kozloduy NPP Stress Tests

“Kozloduy NPP” PLC
SUMMARY REPORT
for Conduct of Kozloduy NPP
Stress Tests
Quality control during maintenance and repairs is performed by highly qualified, authorized
personnel to the extent specified in the documents to carry out an activity.
All activities are performed according to approved plans, programs and procedures.
For the facilities under regulatory control periodic technical reviews shall be conducted to
make sure that they are operable and their safe operation is possible.
Design, engineering, technology, installation, operational and maintenance documentation
of the facilities under regulatory control is developed in compliance with the requirements of the
NRA for performance of the respective work in accordance with the NPP design.
Control for meeting the requirements of normative documents for ТН is carried out by the
inspectors of departmental technical inspection in sector "internal Departmental Technical
Inspection" of Safety Management.
Surveillance Program for Units 1 to 4 Equipment [95] and Surveillance Program for Units 5
and 6 Equipment [96] have been introduced. They take into account requirements of the Safety
Analysis Report for the facilities, technical specifications, results of the safety systems reliability
analyses. The programs are aimed at maintaining the availability of equipment and validation of the
limits and conditions during operation.
Maintenance and repair activities, nondestructive testing of metal, modernization and
reconstruction, certification and testing of equipment, including their qualification are included in
the "Program of units 3 and 4 lifetime management" [97] and "Program of units 5 and 6 lifetime
management" [98]. The selection of SSCs subject to monitoring and evaluation of the remaining
lifetime is made to considering their classification and qualification, and their importance for
performance of safety functions. The list of safety related systems and components subject to repair
and maintenance of units 5 and 6 has been approved [99].
To implement these programs specialized units and structures have been established. For
each activity written procedures are developed in accordance with quality assurance system. The
activities are carried out by qualified personnel.
Safe operation of hydraulic facilities and all activities for the control of their condition as
well as civil structures is ensured by a separate structure - Workshop "Hydraulic facilities and civil
structures" for effective lifetime management. Seismic monitoring of the facilities and KNPP site
and cadastral services within the company have been conducted.
Lifetime management includes passport provision, review of the status and development of
engineering and construction facilities through dedicated observations and measurements, programs
for comprehensive and 72-hour tests of newly constructed facilities and equipment, testing after
repair and reconstruction, development and/or ensuring measures for corrective effects on the
facilities, control of changes.
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