Abstract
Deterministic safety analysis (DSA) is essential for nuclear power plant licensing. The conservative method followed CFR50 Appendix K, which will lead to a large margin. As one of the DSA methodologies, best estimate plus uncertainty (BEPU) generates more realistic results that can be used in the license application of nuclear power plants (NPPs). However, uncertainty evaluation of parameters is needed in BEPU. In this article, the safety regulatory focuses on the large break loss of coolant accident (LBLOCA) of an advanced PWR. The BEPU analysis is mainly performed by TRACE V5.0 patch 4 code, and the uncertainty analysis is conducted based on DAKOTA code. For correlation coefficients analysis, the sample size is enlarged reasonably. According to the results, this NPP meets the acceptance criteria effectively in LBLOCA with enough margin. By statistic assessment, the set of PCTs calculated has typical normal distribution characters. Based on BEPU, the uncertainties of parameters are studied. Additionally, the influence of sample size on the correlation of parameters is considered too. It could be seen that more samples could permit a more accurate estimation for Spearman partial correlation coefficient (abbreviated as SPCC). The conclusions of this article can provide technical support for the subsequent review of the safety analysis report and the design changes of NPPs.
Highlights
When the pressure of the main loop decreases below the default value, the core makeup tanks (CMTs) water can directly inject into the vessel through the direction vessel injection (DVI) line
The water in ACCs and in containment refueling water storage tank (IRWST) will drain into the reactor coolant system (RCS) by gravity through DVI too [17,18]
Models in compute code is a best-estimate reactor system code developed by NRC, which code used for nuclear safety evaluation should be verified in detail, andcomevaluation bines the advantages of four main systems codes, known as TRAC-P, TRAC-B, RELAP5, models must be able to describe the relevant physical processes during the reactor acci and RAMONA
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Gas, and other energy types, nuclear energy, as an important clean energy, has no air pollution, no carbon dioxide, high energy density, and stable power generation. It is the only green energy source until now that can be continuously supplied in the form of a low ecological impact and low-carbon source and can be used stably on a large scale as with fossil fuel energy. According to the data of the world nuclear energy association, as of January 2021, global nuclear power generation has accounted for
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