ISSN Online: 2377-424X
ISBN Print: 0-89116-559-2
International Heat Transfer Conference 8
STEAM GENERATOR FEEDLINE BREAK SIMULATION TESTS
Resumo
This paper presents the results of an experimental program to determine the consequences of a guillotine break, in the feedline of a CANDU PHWR steam generator with integral preheater. A model preheater assembly simulating the important features of the preheater in its early response to a feedline rupture was used. The experiments were carried out at feedwater inlet conditions corresponding to normal operating and 5% power conditions respectively. The effect of tube-to-thermal plate clearance was also investigated.
In general, depressurization occurs in stages within the feedline, with the pressure dropping to ambient in 7 to 11 ms, whereas it is more uniform and slower in the preheater. Pressure loading on the preheater was within acceptable limits for all tests. The zero tube-to-thermal plate clearance resulted in higher pressure loading on the thermal plate than with the nominal Ñlearance. Also blowdown from the 5% power condition resulted in greater pressure loading on the preheater than the normal оperating power condition.
In general, depressurization occurs in stages within the feedline, with the pressure dropping to ambient in 7 to 11 ms, whereas it is more uniform and slower in the preheater. Pressure loading on the preheater was within acceptable limits for all tests. The zero tube-to-thermal plate clearance resulted in higher pressure loading on the thermal plate than with the nominal Ñlearance. Also blowdown from the 5% power condition resulted in greater pressure loading on the preheater than the normal оperating power condition.