Steam generator U-tubes flow distribution under degraded secondary system conditions
Flow surges have been observed in the instrumented U-tube of the broken loop steam generator during a single phase natural circulation period of a Loss of Feed Water (LOFW) transient conducted in the LOBI-MOD2 test facility. The paper presents a physical and analytical interpretation of the mechanism governing the onset and eventual divergence of flow surges observed in the LOBI-MOD2 steam generators during the evolution of thermal hydraulic transients relevant to decay heat removal in PWRs. A generalised analytical steady-state model is used to characterise the transient from the potential operating conditions of steam generators. A numerical method is then described, applicable to unstable conditions.
Bibliographic Reference: Paper presented: International Topical Meeting on Safety of Thermal Reactors, Portland, Oregon (US), July 21-25, 1991
Availability: Available from (1) as Paper EN 35977 ORA
Record Number: 199110422 / Last updated on: 1994-12-02
Original language: en
Available languages: en