Toplinski izračun donjeg plenuma reaktorske posude

master's thesis

• Title (english): Thermal calculation of the lower plenum of a reactor vessel
• Author: Ivan Ilievski
• Mentor: Siniša Šadek (mentor)
• Committee member: Siniša Šadek (predsjednik povjerenstva)
• Committee member: Krešimir Trontl (član povjerenstva)
• Committee member: Ninoslav Holjevac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2020-09-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Toplinskom analizom donjeg plenuma ispitana je termička izdržljivost stijenke reaktorske posude prilikom teškog akcidenta sa taljenjem jezgre. Analiziran je donji plenum posude PWR reaktora kakav se nalazi u Nuklearnoj elektrani Krško. Načinjena su tri modela, koji su predstavljali tri scenarija prilikom nesreće, a razlikovali su se u količini rastaljene jezgre u donjem plenumu (70%, 50% i 30%). Simulacijama su prikazana ponašanja struktura donjeg plenuma i mogućnosti odvođenja ostatne topline nastale nuklearnim raspadima fisijskih produkata. Za slučaj najveće količine taljevine dodatno je ispitana mogućnost hlađenja posude vanjskim sustavom ERVC i djelovanje tog sustava na integritet posude.

Abstract (english)

Thermal endurance of the pressure vessel wall in the event of a severe accident which entails melting of the core is examined using the thermal analysis of the lower plenum. The lower plenum of a PWR reactor vessel, also found in the Krško Nuclear Power Plant, is analysed. Three models which represent three accident scenarios are developed. The models differ in the amount of molten core in the lower plenum (70%, 50% and 30%). Simulations display the behaviours of the lower plenum structures as well as the possibilities of dissipating decay heat produced by the nuclear decay of fission products. In case of the highest amount of melting, the possibility of vessel cooling using exterior ERVC system is tested alongside the effect of the mentioned system on vessel integrity.

• Keywords: rastaljeni materijal; donji plenum; prijenos topline; metoda konačnih elemenata
• Keywords (english): molten material; lower plenum; heat transfer; finite element method
• Language: croatian
• URN:NBN: urn:nbn:hr:168:685119
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-01-13 09:08:45