[en] Nuclear Power Plant incidents or accidents are initiated very often by a component failure even if it is not regarded as a safety related component. Plant safety, reliability and cost effectiveness can be enhanced and what is most important, the hazards for the environment can be reduced significantly through appropriate use of some specific Early Failure Detection Method or System. In the present paper the current trends in Nuclear Power Plant Krsko and licensing aspects introducing monitoring and diagnosis systems are described, to improve NPP reliability and safety. Most of the nuclear power plants are currently under preparation of the program - a systematic approach to implement different Early Failure Detection Systems. Possible contents of these programs is described in detail in several technical papers. Usually, monitoring of specific nuclear power plants parameters, components and systems shall be considered as a tool of integrity. Reasons for monitoring are contained in regulatory requirements and in operation experience, on the other hand, the licensee is highly interested for safe and reliable operation. The operational events and failures are usually the first initiator for systematic approach to specific phenomena observation and its analysis. The Slovenian Nuclear Safety Administration follows the efforts of NPP Krsko in all above mentioned fields including training of personnel, adequate procedures related QA Program and experience from other NPP utilities and Regulatory Bodies. The licensing aspects contain all the specific steps as they are required for specific plane modification. As a guide, the methodology and guidelines from the US code 10CFR 50.59 for safety evaluation are taken into account. The safety review process is a complex activity of all departments at the Slovenian Nuclear Safety Administration. In the case of an unreviewed safety question an engineering evaluation and a thorough understanding of the design basis of the system are essential. In the conclusion the possibility of the early failure detection operator support systems introduction into NPP Krsko regarding existing systems is discussed. (author)