Analysis of fission product reduction strategy in SGTR accident using CFVS

Hoyoung Shin, Seungwoo Kim, Yerim Park, Youngho Jin, Dong Ha Kim, Moosung Jae

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)812-824
Number of pages13
JournalNuclear Engineering and Technology
Volume53
Issue number3
DOIs
StatePublished - 2021 Mar

Keywords

  • Containment filtered venting system (CFVS)
  • Fission product release
  • Power operated relief valve (PORV)
  • Severe accident management strategy (SAMG)
  • Steam generator tube rupture (SGTR)

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