Nuclear Energy for New Europe 2009

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No: 410

Conference: Nuclear Energy for New Europe 2009

Title: Parametric Analysis of Aerosol Mass Deposition in PHEBUS Containment under FPT-3

Theme: Severe Accidents

Author(s): Aurimas Kontautas, Egidijus Urbonavičius

Contact : Aurimas Kontautas

E-mail: aurkon@mail.lei.lt

Address: Lithuanian Energy Institute Laboratory of Nuclear Instalation Safety
LT - 44403 Kaunas

Country: Lithuania

After severe accidents in nuclear reactors at Three Mile Island in 1979 and at Chernobyl in 1986, a worldwide effort has been undertaken to understand and to model severe accident phenomena in nuclear reactors in case of a hypothetical loss of core cooling. The most extensive international program, performed under French Institut de Protection et de Sureté Nucléaire (IPSN), is PHEBUS Fission Product (FP) program. The PHEBUS FP program provides a unique opportunity for performing integral experiments, using real core materials and scaled, well instrumented models of the primary circuit and containment. PHEBUS FP program is not only experimental program, but also concerns and wide range of analitical researches.
This paper deals with the analysis of processes in containment under PHEBUS FPT-3 conditions. COCOSYS code was used for the analysis of processes that occur in PHEBUS containment. Containment model of 19 nodes for analysis of FPT-3 experiment, already, with good agreement, was used for FPT-1 calculation. Simulation of thermo hydraulic parameters (pressure, temperature, etc.) are in good agreement with measured experimental results, which provides a good basis for the analysis of aerosol particles transport and deposition. Parametric analyses were performed to investigate the influence of aerosol density and aerodynamic mass median diameter (AMMD) on the aerosol deposition rate and deposition distribution in PHEBUS containment. Performed analysis showed that aerosol density has only minor influence on the aerosol transport and distribution, and AMMD strongly influences deposition mechanisms in the containment and specially gravitational settling.

No:	410
Conference:	Nuclear Energy for New Europe 2009
Title:	Parametric Analysis of Aerosol Mass Deposition in PHEBUS Containment under FPT-3
Theme:	Severe Accidents
Author(s):	Aurimas Kontautas, Egidijus Urbonavičius
Contact :	Aurimas Kontautas
E-mail:	aurkon@mail.lei.lt
Address:	Lithuanian Energy Institute Laboratory of Nuclear Instalation Safety LT - 44403 Kaunas
Country:	Lithuania

After severe accidents in nuclear reactors at Three Mile Island in 1979 and at Chernobyl in 1986, a worldwide effort has been undertaken to understand and to model severe accident phenomena in nuclear reactors in case of a hypothetical loss of core cooling. The most extensive international program, performed under French Institut de Protection et de Sureté Nucléaire (IPSN), is PHEBUS Fission Product (FP) program. The PHEBUS FP program provides a unique opportunity for performing integral experiments, using real core materials and scaled, well instrumented models of the primary circuit and containment. PHEBUS FP program is not only experimental program, but also concerns and wide range of analitical researches. This paper deals with the analysis of processes in containment under PHEBUS FPT-3 conditions. COCOSYS code was used for the analysis of processes that occur in PHEBUS containment. Containment model of 19 nodes for analysis of FPT-3 experiment, already, with good agreement, was used for FPT-1 calculation. Simulation of thermo hydraulic parameters (pressure, temperature, etc.) are in good agreement with measured experimental results, which provides a good basis for the analysis of aerosol particles transport and deposition. Parametric analyses were performed to investigate the influence of aerosol density and aerodynamic mass median diameter (AMMD) on the aerosol deposition rate and deposition distribution in PHEBUS containment. Performed analysis showed that aerosol density has only minor influence on the aerosol transport and distribution, and AMMD strongly influences deposition mechanisms in the containment and specially gravitational settling.