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V diplomskem delu smo predstavili obnovo jeklenih konstrukcij v 400 kV redudantnem in transformatorskem stikališču Nuklearne elektrarne Krško, ki je del celotnega stikališča ob jedrski elektrarni. V uvodu smo predstavili jeklo kot material, napad korozije na jeklo, spa-janje jeklenih konstrukcij, vplive za nastanek korozije, pripravo materiala za izvedbo anti-korozijske zaščite jeklenih konstrukcij ter zaščitno konstrukcij z nanosom premazov. V dru-gem delu pa smo predstavili izvajanje demontažnih in montažnih del v samem stikališču v času pred in med remontom v oktobru 2013. Pri obnovi 400 kV redudantnega in transformatorskega polja sem bil v vlogi odgovornega vodje gradbišča, ko je investitor že potrdil instalacijski paket – dokumentacijo s predstavi-tvijo organizacije gradbišča in postopki izvedbe del. Na zahtevo investitorja sem vodil dela v stikališču, saj sem imel v družbi, ki je izvajalo gradbena dela, reference za vodenje podobnih del. In the diploma we present restoration of steel structures in 400 kV redundant and trans-former switchyard of Nuklear power plant Krško which is a part of whole switchyard near nuclear power plant. In introduction we present steel as material, corrosion attack on steel, merging of steel constructions, impacts on corrosion formation, preparations of material for implementations on anticorrosion protection of steel constructions and making protective coatings on constructions. In second part we present performing of installation and dismantling parts in switchyard in time before and during repairs in October 2013. In restoration of 400 kV redundant and transformer field I was in a roll of responsible construction supervisor when investor all-ready confirmed installation package – documentation with presentation of construction site organisation and procedures of work executions. On investors demand I was running the work in the switchyard since I had references for running similar jobs from a company that was doing construction works.

V tem delu obravnavamo problemo varjenja posebnega tipa nizkoogljičnega avstenitnega jekla 316L. Ta tip jekla je posebej odporen na kislinsko korozijo. Uporabimo ga v primerih, ko je potrebno zagotoviti optimalno učinkovitost izdelkov kot tudi maksimalno varnost uporabnikov. Cilj te naloge je bil preizkusiti različne tipe in tehnike varjenja ter njihov vpliv na lastnosti osnovnega materiala, a tudi preizkusiti lastnosti zvarov, da bi preverili njihovo zanesljivost in skladnost z zahtevami standardov This work deals with the problem of welding of special type of low-carbon austenitic steel 316L. This type of steel is especially resistant to acid corrosion, therefore it is applied in cases when optimal effectiveness of products and maximum level of safety should be ensured. The goal of this work was to test different types and techniques of welding and their impact on the properties of the base material, but also to test the weld properties and inspect their reliability and correspondance to standard demands.

V diplomskem delu je predstavljeno preiskovanje oziroma odkrivanje napak v materialih z neporušnimi metodami. Diplomsko delo ne zajema le ultrazvočne metode, ampak večino neporušnih metod, saj se med seboj dopolnjujejo. Za nemoteno obratovanje Termoelektrarne Šoštanj je vzdrževanje strojev ali drugih konstrukcijskih sklopov ključnega pomena. Vsi pomembnejši zunanji sklopi, se pregledujejo sproti in po predpisani periodiki pregledov, ko je blok v obratovanju. Vendar pa vseh delov med obratovanjem ni mogoče pregledati, zato se pregledujejo v remontu ali pa postroj izločijo iz obratovanja, da se opravijo potrebne preiskave. Osebje, ki izvaja neporušne preiskave, mora biti usposobljeno in ustrezno certificirano. The diploma thesis presents the research or error detection in materials with non-destructive testing methods. It does not contain only the ultrasound methods but also the greater part of the non-destructive testing methods as they supplement each other. The maintenance of machinery and other construction sets represents the key factor for the unhindered operation of the Thermal power station Šoštanj. All important external sets are regularly inspected during the operation of the block according to the prescribed inspection time schedule. However, all parts cannot be inspected during the operation of the station therefore they have to be inspected during the overhaul or while the set is withdrawn from service in order to perform the necessary inspections. The personnel performing the non-destructive inspections must be qualified and appropriately certified.