Browsing by Author "Oksa, Annmarie"

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    Analysis of containment fire hazards for a nuclear power plant
    (2021-08-23) Oksa, Annmarie; Biese, Mikael; Insinööritieteiden korkeakoulu; Vuorinen, Ville
    The Safe operation of nuclear power plants is the number one priority in all nuclear facilities globally. Nuclear power plants are designed against all the threats considered possible for the plant design in question at the specific plant site and the design is verified with numerous safety analyses to ensure the safety of people and the environment. In this Thesis, the design of a reactor building of a Finnish nuclear power plant, Hanhikivi 1, is reviewed as part of the design review process of the plant. This study concentrates on evaluating internal fires that are a common threat for all nuclear facilities. In this study, a fire hazard analysis for the reactor building of Hanhikivi 1 is conducted. The objective of the research is to verify the sufficiency of the current physical separation and fire hazard protection measures in the reactor building and suggest modifications if necessary. Furthermore, the availability of safety functions in the reactor building to prevent accident progression and to ensure the safety of the facility in fire situations is reviewed. Fire hazard analysis conducted in this study consists of the identification of the most critical fires in the reactor building as well as structural and functional fire hazard analyses. In the structural fire hazard analysis, damaged area for the identified fire scenario is determined utilizing a computational fluid dynamic software called Fire dynamic simulator (FDS). In the functional fire hazard analysis, the consequences of the damage to nuclear safety are examined. The results of the study show that the current physical separation and fire hazard protection measures applied in the reactor building design are sufficient to ensure nuclear safety in the identified fire situations. Even though the fire protection is satisfactory from a nuclear safety perspective, some improvement suggestions for the protection measures were found. The study indicates that cable wrapping, which is currently widely proposed to be used in the building, is not necessary for the identified scenarios. Further studies regarding this topic with more detailed fire simulations are however recommended. Furthermore, one of the identified fire scenarios was excluded from the study and it is recommended to conduct analyses for it when the necessary design information is available
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    Hiilidioksidin talteenottotekniikat voimalaitosprosesseissa
    (2019-04-18) Oksa, Annmarie; Santasalo-Aarnio, Annukka; Insinööritieteiden korkeakoulu; Paatero, Jukka