PROPOSAL OF THE TEST PROBLEM ON POWER DISTRIBUTION VS INTERASSEMBLY GAP
17th Symposium of AER on VVER Reactor Physics and Reactor Safety (2007, Yalta, Crimea (Ukraine, back then))
SPECTRAL AND CORE CALCULATION
The paper dedicated to the test problem of pin power distribution in the fuel assembly dependent on interassembly water gap. Necessity for the solution of an offered test problem is dictated by that in process of operation of reactor VVER-1000 fuel assemblies deformations and change of distance between them were observed. That leads to local change of power release in peripheral rows of pins. In spite of the fact that in a design of last generation of fuel assemblies the scale of deformation is reducing, an estimation of possible increase of power release remains an actual problem.