Transient boiling flow in 5 × 5 rod bundle under non-uniform rapid heating

Hiroki Takiguchi, Masahiro Furuya, Takahiro Arai, Kenetsu Shirakawa

Research output: Contribution to journalArticle

Abstract

Rapid thermal elevation in boiling water reactor (BWR) is an important factor for nuclear safety and there is a need to develop an analysis code for the transient phenomenon and its validation process. To evaluate the thermal property of transient boiling and its uncertainty, corroborative experimental information is crucial. In particular, the lateral propagation behavior of a vapor bubble (void) in the cross-sectional direction of fuel assembly has yet to be determined. This study evaluates the void propagation behavior in a 5 × 5 rod bundle with cross-sectional heat distribution that causes only the 3 × 3 rod bundle to generate heat; assuming rapid heating under atmospheric pressure. In this paper, using the maximum heat output applied to the nine heated rods as a parameter, from the visualization of the void behavior and the measurement of the local void fraction, the heat output conditions under circumstances where lateral propagation of voids occurs and where voids are only localized in the heated region are summarized. We quantified the time difference initially detected and the time-averaged void fraction according to the lateral propagation level.

Original languageEnglish
Pages (from-to)447-456
Number of pages10
JournalNuclear Engineering and Design
Volume340
DOIs
Publication statusPublished - 2018 Dec 15
Externally publishedYes

Fingerprint

boiling
void
Boiling liquids
bundles
voids
rods
heating
Heating
Void fraction
heat
propagation
Boiling water reactors
boiling water reactors
Atmospheric pressure
output
Thermodynamic properties
Visualization
Vapors
Hot Temperature
atmospheric pressure

Keywords

  • 5 × 5 rod bundle
  • BWR fuel
  • Cross vapor propagation
  • Rapid heating
  • Transient boiling
  • Wire mesh sensor

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Mechanical Engineering

Cite this

Transient boiling flow in 5 × 5 rod bundle under non-uniform rapid heating. / Takiguchi, Hiroki; Furuya, Masahiro; Arai, Takahiro; Shirakawa, Kenetsu.

In: Nuclear Engineering and Design, Vol. 340, 15.12.2018, p. 447-456.

Research output: Contribution to journalArticle

Takiguchi, Hiroki ; Furuya, Masahiro ; Arai, Takahiro ; Shirakawa, Kenetsu. / Transient boiling flow in 5 × 5 rod bundle under non-uniform rapid heating. In: Nuclear Engineering and Design. 2018 ; Vol. 340. pp. 447-456.
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