LEAK RATE EVALUATION FOR THROUGH-WALL CRACKS

摘要

The Leak Before Break (LBB) concept is widely used in the nuclear industry to eliminate protective componentspreviously accounting for dynamic effects of pipe rupture. A computer program LRCPC (Leak Rate Calculation if PipeCrack) has been developed here to show detectable leak rates prior to crack growth instability. The progrmn evaluates theLBB hypothesis for the pipe loads, material, crack length, and pipe geometry. The input stagnation conditions includesubcooled or saturated liquid where the uncritical flow as well as the critical flow at the exit plane is considered, two-phrasemixture or saturated steam and superheated steam discharge at the exit plane. Calculation results are compared to thepublished calculating data. Effects of flow parameters such as friction on the critical mass flow rate are investigated.