Authors & Affiliations

Orlova E.A.1, Kruglov A.B.2, Chuvayev D.V.3, Struchalin P.G.2, Zagrebaev C.A.1, Zhmurin V.G.1
1A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
2National Research Nuclear University MEPhI, Moscow, Russia
3Obninsk Institute for Nuclear Power Engineering, Obninsk, Russia

Orlova E.A. – Cand. Sci. (Tech.), Associate Professor, Leading Researcher, A.I. Leypunsky Institute for Physics and Power Engineering. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga reg, Russia, 249033. Tel.: (484)399-42-34; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Zagrebaev C.A. – Researcher, A.I. Leypunsky Institute for Physics and Power Engineering.
Zhmurin V.G. – Leading Enginear, A.I. Leypunsky Institute for Physics and Power Engineering.
Kruglov A.B. – Cand. Sci. (Tech.), Associate Professor, Leading Researcher, National Research Nuclear University MEPhI.
Struchalin P.G. – graduate student, National Research Nuclear University MEPhI.
Chuvayev D.V. – magistr, Obninsk Institute for Nuclear Power Engineering.

Abstract

Decrease in temperature of fuel by means of a heat-conducting sublayer on the basis of lead ensures its reliable functioning at deep burning out, reduces swelling of fuel and gas emission, increa ses radiation firmness of fuel elements and, thus, increases safety of reactor installation.

At research of fuel elements with nitride fuel and a lead liquid metal sublayer under radiation in reactor BOR-60 the problem of compatibility of an sublayer with a cover of fuel elements from steel of a ferritno-martensitny class of brand 16Cr12WMoSiVNbB is found

We offered option of use as heat-conducting sublayer in fuel elements of the lead alloyed by magnesium, zirconium of the sheeting of nitride (carbide) of zirconium, providing spontaneous formation on a surface of steel in an eutectic on the basis of lead with the maintenance of 2,25% mass (0,164 nuclear shares) of magnesium and to 0,2% mass zirconium. Thus self-curing of casual damages of a covering is provided.

Settlement results of distribution of temperature in fuel elements with nitride fuel containing 13% of Pu testifying to decrease in value of the maximum temperature with 1550°C in the center of fuel in of fuel elements with a helium underlayer to 800°C when using as a liquid metal sublayer of a leadmagnesium eutectic are received. Temperature on external and internal surfaces of a cover from steel doesn't exceed 620°C.

Considering that a Pb-2,25% alloy Mg-to 0,2% of Zr causes anticorrosive protection of an internal surface of a cover and the melting temperature lowered in comparison with lead (248°C are relative 327°C for lead), the specified alloy has clear advantages over lead.

Keywords
fuel element, liquid metal sublayer, lead, magnesium, zirconium eutectic, nitrogen, distribution of temperature

Article Text (PDF, in Russian)

References

UDC 621.039.546:621.039.534

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants", 2016, issue 4, 4:11