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Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
Kwon-Yeong Lee, Moo Hwan Kim
Nuclear Technology | Volume 163 | Number 2 | August 2008 | Pages 261-272
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT08-A3986
Articles are hosted by Taylor and Francis Online.
A theoretical model using a heat and mass transfer analogy was developed to investigate the effects of noncondensable gases on the heat transfer coefficient of steam condensing inside a vertical tube. The Nusselt and Sherwood numbers in the gas phase were modified to incorporate the effects of condensate film roughness, suction, and developing flow. The model predictions showed good agreement with the experimental data obtained for various experimental conditions. A parametric study was conducted using the model with condenser tube diameter as a variable. The results indicated that the effects of noncondensable gases become weak as the inlet mixture Reynolds number (Remix,in = 4[over dot]mmix,in/dimix,in) increases and inlet noncondensable gas mass fraction (Wnc,in = [over dot]mnc,in/([over dot]mnc,in + [over dot]mv,in)) decreases. In addition, the effects of noncondensable gases also become weak as the condenser tube diameter decreases with the same inlet mixture Reynolds number because of interfacial shear stress.
