Authors & Affiliations
Electrogorsk Research Center for Safety of Nuclear Power Plants, Electrogorsk, Russia
More efficient operation of reactor plant fuel assemblies can be achieved through the use of new technical solution aimed obtaining more intense heat removal on conves heat-transfer surfaces, and higher values of departure from nucleater boiling ratio (DNBR). Technical solutions using which it is possible to obtain more intense heat removal on convex heat-transfer surfaces and higher DNBR values in reactor plant fuel assemblies are considered. One possible way in which more intense heat removal from a convex heat transfer surface can be obtained is to use interacting swirl flows. Enhancement of heat transfer on the convex heat-transfer surfaceis achieved owing to interaction between the swirled and transit flows.
The use of interacting swirled flows (swirl flow and transit flow) for enhancing heat transfer on a convex heat-transfer surface of fuel rods makes it possible to achieve significantly better heat removal in the convective region (by a factor of 2-3 as compared with a smooth surface. The CHF values in the entire region of two-phase flow are higher than the CHF values for a smooth surface (from 30% in the surface boiling region to 250% in the region of dispersed annular flow mode). By implementing an alternative heat removal arrangement in FAS in which heat is removed from both convex and concave heat heat-transfer surfaces of fuel rods, it is possible to obtain a significally lower maximal fuel rod temperature (by more than 1000 C with the reactor plant power output increased to 150%), significally higher power density in the reacto r plant, and much higher DNBR values on the concave and convex heat–transfer surfaces of fuel.
fuel assembly, heat removal intensity, heat removal enhancement methods, convex surface, burn-out, critical heat flux
1. Kuzma-Kichta Yu.A. Metody intensifikatsii teplobmena [Heat Transfer Enhancement Methods]. Moscow, MEI Publ., 1994. 204 p.
2. Chesna B. Teplootdacha i gidrodinamika v gazoookhlazhdaemykh sterzhnevykh teplovydelya-yushchikh sborkakh [Heat Transfer and Hydrodynamics in Gas-Cooled Fuel Rod Assemblies]. Kaunas, Lithuanian Power Engineering Institute, 2003. 64 p.
3. Boltenko E.A. Krizis teploobmena v kol'tsevykh kanalakh s zakrutkoy potoka [The heat_transfer crisis in annular channels with swirl flow]. Teploenergetika – Thermal Engineering, 2003, no.11, pp.25.
4. Boltenko E.A. Teploperedayushchee ustroystvo [A heat_transfer device]. Patent RF, no.1540426, 1992.
5. Boltenko E.A. Nekotorye metody povysheniya effektivnosti teplovydelyayushchikh sborok [Some methods for achieving more efficient performance of fuel assemblies]. Teploenergetika – Thermal Engineering, 2014, vol. 61, no.7, pp. 533.
6. Boltenko E.A. Teplovydelyayushchaya sborka [A fuel assembly]. Patent RF, no. 2295785, 2007.
7. Blinkov V.N., Boltenko E.A. Teplovydelyayushchaya sborka [A fuel assembly]. Patent RF, no. 2220464, 2003.
8. Blinkov V.N., Boltenko E.A., Elkin I.V., Melikhov O.I., Solov’ev S.L. Perspektivy ispol'zovaniya kol'tsevykh tvelov v atomnoy energetike [Prospects for using annular fuel elements in nuclear power engineering]. Teploenergetika – Thermal Engineering, 2010, vol. 57, no. 3, pp. 213.