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1.
Analiza cevovodov v NEK d.o.o.
Iztok Deržanič, 2015, master's thesis

Abstract: Magistrsko delo se nanaša na področje načrtovanja in analiziranja cevovodnih sistemov v podjetju Nuklearna elektrarna Krško (NEK), d. o. o. Prikazan je potek načrtovanja novega sistema odmuljevanja v zgradbi bistvene oskrbne vode (ESW), ki bi nadgradil obstoječi način odstranjevanja usedlin s pomočjo potapljača. Sistem bistvene oskrbe vode ima pomembno vlogo pri zagotavljanju varnosti, saj je njegov primarni namen odvajanje toplote iz sistema hlajenja komponent. Z vgradnjo novega sistema bi tako varnost delovanja elektrarne še povišali. Analiza cevovoda je izvedena s pomočjo računalniškega programa Bentley AutoPIPE, ki je certificirano orodje za izdelavo analiz v jedrski industriji. Za analizo je izdelan model, ki temelji na zahtevah standardov ASME B31.1 in ASME BPVC, sekcija III, ki se v NEK uporabljata za načrtovanje novih cevovodnih sistemov. Prikazani in primerjani so rezultati analiz po posameznem standardu. V splošnem pa predstavljeno delo zajema opis podjetja in nekaj splošnih informacij o njegovem delovanju, predstavljeni so standardi in pripadajoča zakonodaja, opisana in izvedena pa je tudi zgoraj omenjena analiza.
Keywords: Nuklearna elektrarna Krško, preračun cevovodov, ASME B31.1, ASME Boiler and Pressure Vessel Code
Published: 28.10.2015; Views: 1029; Downloads: 168
.pdf Full text (3,12 MB)

2.
Microcrack initiation and growth in heat-risistant 15Kh2MFA steel under cyclic loading
P. Yasniy, V.B. Hlado, V. Hutsaylyuk, Tomaž Vuherer, 2005, original scientific article

Abstract: This paper presents the results of investigation of a nuclear reactor pressurevessel steel 15Kh2MFA of two strength levels under cyclic loading. Themechanism of microcrack formation on the surface and in the bulk of 15Kh2MFA steel under cyclic deformation was investigated. Analysis of the specimen surfaces has shown that microcracks are caused by cyclic sliding in grains most favourably oriented with respect to the direction of the maximum shear stresses. Transmission electron microscope investigations show that microcracks in the material inside the grains are formed mainly along the band-type dislocation structure parallel to the dislocation subboundary. During cyclic deformation, the dislocation density on the subboundaries increases, in the local areas the dislocation density becomes limiting and it reaches the plasticity limit and causes microcrack formation. The interrelation of the average length of microcracks and their surface density with the energy density of inelastic deformation has been found.
Keywords: material testing, nuclear reactor, pressure vessel, cyclic loading, cyclic deformation, dislocation structure, fatigue crack growth, TEM, fracture mechanics
Published: 01.06.2012; Views: 1277; Downloads: 34
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