A two-phase model for simulation of MTR type research reactor during protected and unprotected LOFA

Talebi, Saeed; Najafi, P.

doi:10.1016/j.pnucene.2018.10.004

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…The PARET code was also used for conducting LOFA in NUR reactor [8] and analyzing core flow bypass [9]. Whereas RELAP5 code is also used for IAEA 10MW [10]. As comparison, analysis of LOFA on research reactor have been conducted for IEA-R1 and TRIGA reactors by using EUREKA-2/RR [2,11].…”

Section: Introduction *mentioning

confidence: 99%

Transient Analysis of Simultaneous Lofa and Ria in RSG-Gas Reactor After 32 Years Operation

2020

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During the operation of the research reactor RSG-GAS, there are many design parameters should be verified based on postulated accidents. Several design basis accidents (DBA) such as loss of flow accident (LOFA) and reactivity-initiated accident (RIA) also have been conducted separately. This paper discusses about possibility of simultaneous accidents of LOFA and RIA. The accident analyses carry out calculation for transient condition during RIA, LOFA, and postulated accident of simultaneous LOFA-RIA. This study aims to conduct a safety analysis on simultaneous LOFA and RIA, and investigate the impact on safety margins. The calculations are conducted by using the PARET code. The maximum temperature of the center fuel meat at nominal power of 30 MW and steady state conditions is 126.10°C and MDNBR of 2.94. At transients condition, the maximum center fuel meat temperature for LOFA, RIA and simultaneous LOFA-RIA are consecutively 132.99°C, 135.67°C and 138.21°C, and the time of reactor trip are 3.2593s, 3.6494s and 2.7118s, respectively. While the MDNBR for LOFA, RIA and simultaneous LOFA-RIA are respectively at transient condition are 2.88, 2.58 and 2.63, respectively. It is shown that, simultaneous LOFA-RIA has the fastest trip time. In this case, the low flow trip occurs first in advance to over power trip. From these results, it can be concluded that the RSG-GAS has adequate safety margin against transient of simultaneous LOFA-RIA.Keywords: RSG-GAS, Simultaneous, LOFA, RIA, PARET

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