Simulating investigations on the start-up of the open natural circulation system

Guo, Xueqing; Sun, Zhongning; Wang, Jianjun; Sui, Yu

doi:10.1016/j.nucengdes.2015.03.021

Cited by 6 publications

(1 citation statement)

References 14 publications

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“…(Zhao, Peng, Xu, & Xia, 2020) studied flashing-induced instability in a natural circulation system and the various oscillation patterns observed due to variations in system parameters. Also, (Guo, Sun, Wang, & Yu, 2015) observed various oscillation behaviour resulting from flashing and how changes in system parameters affected the instability. (Kozmenkov, Rohde, & Manera, 2012) carried out an analysis to validate RELAP5 code in modelling flashing-induced instabilities using results from experiments carried out on the CIRCUS facility developed in the Netherlands and observed that the code gave results that were in good agreement with the experimental results.…”

Section: Literature Reviewmentioning

confidence: 98%

The Effects of System Parameters on the Inception of Flashing Using Relap5

Olubunmi

Peng²,

Xia³

2022

mijst

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Natural circulation systems (NCS) are prone to instabilities, they are more unstable compared to forced circulation systems as a result of the low driving head and nonlinearity of the system. Flashing instability is prominent in these systems at low pressure due to the presence of a long nonheated riser to enhance the driving force. RELAP5 code has been identified as one of the Best Estimate (BE) codes used in the analysis of the systems. The studies by different authors showed that the effects of system parameters on instability generally have gained the attention of researchers in recent years. However, these studies have not discussed how these parameters prevent or enhance the commencement of flashing instability. This we sought to achieve in this work, by zeroing in on the inception of flashing instability, by comparing what happened at different heat fluxes. The objective of this work is to investigate the effects of system parameters on the inception of flashing instability in a natural circulation system using the RELAP5 code. With the increase in inlet subcooling and height of the riser, flashing moved to the outlet of the riser, stabilizing the system. However, an opposite effect was observed with an increase in the inlet resistance.

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Section: Literature Reviewmentioning

confidence: 98%