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Numerical Investigation of On-Power Refueling in a Natural Circulation Boiling Water Reactor

[+] Author Affiliations
G. V. Durga Prasad, Manmohan Pandey

Indian Institute of Technology-Guwahati, Guwahati, Assam, India

S. K. Pradhan, S. K. Gupta

Atomic Energy Regulatory Board, Mumbai, Maharashtra, India

Paper No. ICONE16-48396, pp. 389-395; 7 pages
  • 16th International Conference on Nuclear Engineering
  • Volume 3: Thermal Hydraulics; Instrumentation and Controls
  • Orlando, Florida, USA, May 11–15, 2008
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4816-7 | eISBN: 0-7918-3820-X
  • Copyright © 2008 by ASME


Most two-phase heat exchangers consist of multiple parallel boiling channels, and studies concerning multi-channel instabilities in boiling systems are of significant interest. The natural circulation boiling water reactor (NCBWR) considered in the present work is a pressure tube type boiling light water cooled and heavy water moderated reactor. The primary heat transport loop, comprising a number of parallel channels, is modeled by RELAP5/MOD3.4. The effects of on-power refueling on the flow rate and stability of the system are investigated. The conditions under which a sustainable flow rate can be maintained during on-power refueling are explored. It is observed that during on-power refueling, a near-stagnation condition or low-velocity reverse flow can occur, the possibility of reverse flow being higher at low pressures and low powers.

Copyright © 2008 by ASME



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