Induced nuclear reactions: processes – systems – and elements – Fission reactor material treatment – Impurity removal
Patent
1989-03-29
1991-05-28
Lechert, Jr., Stephen J.
Induced nuclear reactions: processes, systems, and elements
Fission reactor material treatment
Impurity removal
376366, 376370, 376371, 376373, 376378, 376379, G21C 1942
Patent
active
050193287
ABSTRACT:
A natural circulation type boiling light-water reactor comprises a pressure vessel, a reactor core disposed within said pressure vessel to heat light water so as to generate main steam, a steam outlet provided in a wall of said pressure vessel for drawing out the main steam therethrough to supply the same to a turbine system, and a steam path along which the main steam flows from the reactor core to the steam outlet. The reactor further comprises a steam guide for prolonging the steam path and/or a radially increased chimney for reducing the velocity of the main steam flowing through the steam path. These causes radioactive isotope .sup.16 N contained in the main steam to flow within the pressure vessel for a time period exceeding its own half-life, so that the inventory of .sup.16 N in the main steam directed towards the turbine system is reduced remarkably. In consequence, shield structures for piping and turbine systems can be reduced in size and weight.
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Iwata Nobukatsu
Koyama Kazuhito
Miki Minoru
Nakayama Tadakazu
Niino Tsuyoshi
Bhat Nina
Hitachi , Ltd.
Hitachi Engineering Co. Ltd.
Lechert Jr. Stephen J.
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