PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY
Series: Nuclear and Reactor Constants

since 1971

Русский (РФ)

ISSN 2414-1038 (online)

BROND-3.1

ISSUES

2024 Issue 3

DEVELOPMENT AND VALIDATION OF AEROSOL EFFECTIVE DENSITY MODEL UNDER SEVERE ACCIDENTS AT NPP

DEVELOPMENT AND VALIDATION OF AEROSOL EFFECTIVE DENSITY MODEL UNDER SEVERE ACCIDENTS AT NPP

EDN: QKFREG

Authors & Affiliations

Savekin S. S., Shmelkov Yu. B.
National Research Center “Kurchatov Institute”, Moscow, Russia

Savekin S.S. – Junior Researcher. Contacts: 1, pl. Akademika Kurchatova, Moscow, Russia, 123182. Tel.: +7 (925) 925-29-79; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Shmelkov Yu.B. – Deputy Head of the Department, Cand. Sci. (Tech.).

Abstract

Aerosols are one of the key forms of fission products formed during beyond design basis accidents with fuel melting (severe accidents). Modeling the transfer and deposition of fission product aerosols in the containment plays an important role in determining the amount of fission product release into the environment, while the deposition of aerosols is largely determined by their density. To date, the key experimental program in which the formation and process of transfer of radioactive fission product aerosols during the melting of fuel samples has been studied is the Phebus-FP experimental program. Based on the results of this program, data on the size distribution of fission product aerosols, data on the composition of aerosols, and estimates of the density of aerosol particles were obtained. The authors of this work have developed a method for assessing the effective density of multi-component aerosols formed during beyond design basis accidents at NPPs. In this work, the particle effective density was assessed using the proposed calculation method for three tests of the Phebus-FP experimental program: FPT-1, FPT-2 and FPT-3. The effective density of aerosol particles is proposed to be modeled in two approximations: “continuity” and “porosity.” The obtained estimates of the effective density values of radioactive aerosols of fission products were used to simulate the transfer of aerosols in the FPT-1/2/3 containment using the MAVR-TA code.

Keywords
effective density, aerosols, fission products, severe accident, NPP, transfer, Phebus-FP, development, MAVR-TA, containment

Article Text (PDF, in Russian)

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Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2024, no. 3, 3:17