Verification and Validation of Passive Heat Removal Systems’ Simulation Models

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master_Zein_Topias_2021.pdf (3.38 MB)

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Sähkötekniikan korkeakoulu | Master's thesis
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Date

2021-12-13

Department

Major/Subject

Sustainable Energy Systems and Markets

Mcode

ELEC3048

Degree programme

Master's Programme in Advanced Energy Solutions

Language

en

Pages

88+10

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Abstract

Deterministic safety analyses are performed in the nuclear industry to ensure that the plant in question can withstand certain postulated events. To study how the plant is affected by such transients or accidents, analyses are made using specialised software. This computer simulation program, a model of the nuclear power plant is constructed to simulate the behaviour of the facility. The results of these analyses, however, depend on the accuracy of the model. As nuclear safety is the most important factor in the nuclear industry, it is essential to ensure that the model used for safety analyses is accurate and models the plant correctly. This is the process called verification and validation. In this thesis, a verification and validation process is performed to two individual parts of the Hanhikivi-1 plant model, the passive heat removal systems of steam generator and of containment. These two were chosen because they are new safety systems unique to Generation III+ reactors and because commissioning test data is available for them from the Leningrad-II nuclear power plant. This real-world data allows to conduct a more reliable validation comparison. The verification was done by studying the model and making preliminary calculations to test the functioning of the systems. As an outcome of this, model updates were made, and the heat convection correlation was changed to Churchill and Chu mixed free and forced convection. The validation study was made by comparing the results calculated in Apros with the results of the commissioning tests performed at Leningrad-II reference plant. The comparison showed that the results are analogous, and that the simulation model is accurate. It is suggested that further studies are performed with these systems as the data available was limited. Additionally, the rest of the model should be verified and validated if more data is made available from the reference plant.

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Supervisor

Salo, Ahti

Thesis advisor

Korhonen, Calle

Keywords

verification, validation, passive heat removal system, Apros

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https://urn.fi/URN:NBN:fi:aalto-2021121910891

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[dipl] Sähkötekniikan korkeakoulu / ELEC