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Evaporation release behavior of volatile fission products from liquid sodium pool to the inert cover gas

Abstract

In fuel failure of sodium cooled fast breeder reactors, released volatile fission products (VFPs) such as iodine and cesium from the fuel will be dissolved into the liquid sodium coolant and transferred to the cover vaporization. In the cover gas system of the reactor, natural convection occurs due to temperature differences between the sodium pool and the gas phase. The release rates of VFPs together with sodium vaporization are considered to be controlled by the convection. In this study, three analytical models are developed and examined to calculate the transient release rates using the equilibrium partition coefficients of VFPs. The calculated release rates are compared with experimental results for sodium and sodium iodide. The release rate of sodium is closest to the calculation by the heterogeneous nucleation theory. The release rate of sodium iodide obtained from the experiment is between the release rates calculated by the model based on heat-and-mass transfer analogy and the Hill`s theory. From this study, it is confirmed that the realistic release rate of sodium is able to be calculated by the model based on the heterogeneous nucleation theory. The conservative release rate of sodium iodide is able to be calculated by the model based on  More>>
Authors:
Nakagiri, T; Miyahara, S [1] 
  1. Oarai Engineering Center, Power Reactor and Nuclear Fuel Development Corp., Oaraimachi, Ibaraki (Japan)
Publication Date:
Dec 01, 1996
Product Type:
Technical Report
Report Number:
PSI-97-02; CONF-9606320-; NEA/CSNI/R(96)-6.
Reference Number:
SCA: 210500; 400201; PA: AIX-28:037653; EDB-97:078560; SN: 97001796088
Resource Relation:
Conference: 4. CSNI workshop on the chemistry of iodine in reactor safety, Wuerenlingen (Switzerland), 10-12 Jun 1996; Other Information: PBD: Dec 1996; Related Information: Is Part Of Proceedings of the 4. CSNI workshop on the chemistry of iodine in reactor safety; Guentay, S. [ed.] [Paul Scherrer Inst. (PSI), Villigen (Switzerland)]; PB: 716 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; 40 CHEMISTRY; FISSION PRODUCTS; EVAPORATION; LMFBR TYPE REACTORS; REACTOR ACCIDENTS; COMPUTERIZED SIMULATION; EXPERIMENTAL DATA; SODIUM; SODIUM IODIDES; THEORETICAL DATA
OSTI ID:
481759
Research Organizations:
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE97624048; TRN: CH9700214037653
Availability:
INIS; OSTI as DE97624048
Submitting Site:
CHN
Size:
pp. 405-422
Announcement Date:

Citation Formats

Nakagiri, T, and Miyahara, S. Evaporation release behavior of volatile fission products from liquid sodium pool to the inert cover gas. Switzerland: N. p., 1996. Web.
Nakagiri, T, & Miyahara, S. Evaporation release behavior of volatile fission products from liquid sodium pool to the inert cover gas. Switzerland.
Nakagiri, T, and Miyahara, S. 1996. "Evaporation release behavior of volatile fission products from liquid sodium pool to the inert cover gas." Switzerland.
@misc{etde_481759,
title = {Evaporation release behavior of volatile fission products from liquid sodium pool to the inert cover gas}
author = {Nakagiri, T, and Miyahara, S}
abstractNote = {In fuel failure of sodium cooled fast breeder reactors, released volatile fission products (VFPs) such as iodine and cesium from the fuel will be dissolved into the liquid sodium coolant and transferred to the cover vaporization. In the cover gas system of the reactor, natural convection occurs due to temperature differences between the sodium pool and the gas phase. The release rates of VFPs together with sodium vaporization are considered to be controlled by the convection. In this study, three analytical models are developed and examined to calculate the transient release rates using the equilibrium partition coefficients of VFPs. The calculated release rates are compared with experimental results for sodium and sodium iodide. The release rate of sodium is closest to the calculation by the heterogeneous nucleation theory. The release rate of sodium iodide obtained from the experiment is between the release rates calculated by the model based on heat-and-mass transfer analogy and the Hill`s theory. From this study, it is confirmed that the realistic release rate of sodium is able to be calculated by the model based on the heterogeneous nucleation theory. The conservative release rate of sodium iodide is able to be calculated by the model based on the Hill`s theory using the equilibrium partition coefficient of sodium iodide. (author) 7 figs., 1 tab., 3 refs.}
place = {Switzerland}
year = {1996}
month = {Dec}
}