Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Analysis of fission product reduction strategy in SGTR accident using CFVS

  • Shin, Hoyoung (Department of Nuclear Engineering, Hanyang University) ;
  • Kim, Seungwoo (Department of Nuclear Engineering, Hanyang University) ;
  • Park, Yerim (Department of Nuclear Engineering, Hanyang University) ;
  • Jin, Youngho (Department of Nuclear Engineering, Hanyang University) ;
  • Kim, Dong Ha (Department of Nuclear Engineering, Hanyang University) ;
  • Jae, Moosung (Department of Nuclear Engineering, Hanyang University)
  • Received : 2020.02.07
  • Accepted : 2020.08.03
  • Published : 2021.03.25
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Abstract

In order to reduce risks from the Steam Generator Tube Rupture (SGTR) accident and to meet safety targets, various measures have been analyzed to minimize the amount of fission product (FP) release. In this paper, we propose an introduction of a Containment Filtered Venting System (CFVS) connected to the steam generator secondary side, which can reduce the amount of FP release while minimizing adverse effects identified in the previous studies. In order to compare the effect of new equipment with the existing strategy, accident simulations using MELCOR were performed. As a result of simulations, it is confirmed that CFVS operation lowers FP release into the environment, and the release fractions are lower (minimum 0.6% of the initial inventory for Cs) than that of the strategy which intends to depressurize the primary system directly (minimum 15.2% for Cs). The sensitivity analyses identify that refill of the CFVS vessel is a dominant contributor reducing the amount of FP released. As the new strategy has the possibility of hydrogen combustion and detonation in CFVS, the installation of an igniter inside the CFVS vessel may be considered in reducing such hydrogen risk.

Keywords

Acknowledgement

This work was supported by the Nuclear Safety Research Program through the Korea Foundation Of Nuclear Safety (KOFONS), granted financial resource from the Multi-Unit Risk Research Group (MURRG), Republic of Korea (No. 1705001).

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