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This paper describes the regulatory control to maintenance activities of Argentine nuclear power plants. It also addresses essential elements for maintenance control, routine inspections, special inspections during planned outages, audits and license conditions and requirements. 1. INTRODUCTION The Law N° 24,804 "Nuclear Activity National Law" defines the regulatory activity's scope and gives to Nuclear Regulatory Authority the responsibility for the nuclear activities control and regulation referring to radiological and nuclear safety issues.

The licensee's preventive and predictive maintenance programme is defined establishing the scope, methods to be implemented, the planning activities and the applicable controls in accordance with the following considerations: 35 - Maintaining and improving reliability and availability of components, equipment and systems - Reducing failures to minimize outages. - Reducing maintenance costs. - Reducing doses by applying adequate techniques and procedures. - Collecting historical maintenance data from all plant components to evaluate component performance.

Comparing the availability for case (a) and case (b), it can 46 be seen that through the inclusion of tests, the availability stays almost constant with increasing preventive maintenance interval, whereas a dramatic decrease in the availability occurs for the performance strategy not considering the regular performance of tests. As already mentioned, the increase in the pump's availability through the inclusion of functional tests is consistent with the decrease in the failed state probability.

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