Full Content is available to subscribers

Subscribe/Learn More  >

Influence of 300MW Fuel Assembly Spacer Grid Improvement on DNBR Analysis

[+] Author Affiliations
Fujun Gan, Zhihong Xu, Chaozhu Zhang, Bing Ren

Shanghai Nuclear Engineering Research & Design Institute, Shanghai, China

Paper No. ICONE25-66892, pp. V006T08A062; 5 pages
  • 2017 25th International Conference on Nuclear Engineering
  • Volume 6: Thermal-Hydraulics
  • Shanghai, China, July 2–6, 2017
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5784-7
  • Copyright © 2017 by ASME


In order to reduce the potential hang up damage risk during refueling operation in Qinshan phase-I NPP, Shanghai Nuclear Engineering Research &Design Institute (SNERDI) carried out improvement work of 300MW fuel assembly space grid (mainly focused on the design of guide vane) to decrease the possibility of snag event between two fuel assemblies. In the whole project, multiple tests and analysis were carried out to demonstrate that the mechanical and thermal-hydraulic performance of new designed grid meets predetermined functional and safety requirement. During above process, DNBR analysis and comparison was performed under the influence of old and new designed spacer grids. For the old design of space grid, W-3 CHF correlation was adopted to calculate the DNBR margin. Thus, the first step was to conform that this CHF correlation can still be used. CFD simulations were employed to calculate the flow and heat transfer phenomenon in 17×17 rod bundles with old and new space grid, to compare the thermal-hydraulic performance of these two kinds of space grids qualitatively. To carry out above DNBR analysis, sub-channel grid loss coefficients are very important parameters. CFD tools and pressure drop tests help us to obtain these parameters. Four special rod bundles were used to calculate ratio of different sub-channels. Based on above work, the typical, thimble, side and corner sub-channel loss coefficient of old and new space grid were obtained, respectively. Finally, based on a safety analysis 14 sub-channel model, DNBR analysis were finished. Results indicated the Minimum DNBR of side and corner cell is a little lower than typical cell model.

Copyright © 2017 by ASME
Topics: Fuels , Manufacturing



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In