REGULATION OF THE ADS TARGET NEUTRON SPECTRUM

REGULATION OF THE ADS TARGET NEUTRON SPECTRUM

BY CHANGING THE TARGET MATERIAL ISOTOPIC COMPOSITION

Georgy L. Khorasanov, Anatoly P. Ivanov, Anatoly I. Blokhin

-6 Phone: 7-08439-9 85 05, Fax: 7-0843982 25, Е-mail: khorasan@ippe.ru

State Scientific Center of the Russian Federation -

Institute for Physics and Power Engineering named after A.I.Leypunsky (SSC RF-IPPE)

1 Bondarenko Square, Obninsk, Kaluga Region, 249033 Russian Federation

In the paper a possibility of using the lead isotope, Pb-208, (52.3 % of the natural mix of isotopes) in the eutectic of lead and bismuth (Pb-Bi), nowadays used in Europe as a material of a target and blanket of Accelerator Driven Systems (ADS), such as the XT-ADS and MYRRHA is considered. Spectra of neutrons and protons in and outside the target from Pb-208(80%)-Bi(20%) are calculated. It is shown that in such target a harder spectrum of neutrons is realized in comparison with the target from the conventional eutectic of natural lead (Pb-nat) and bismuth, Pb-nat(45%)-Bi(55%). The induced activity of the modified lead-bismuth target is reduced due to its depleting by neutrons of intermediate energy, 10-100 keV, and reduction the bismuth quantity in its contents from 55% to 20%.