Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Corrosion or damage prevention
Patent
1995-06-14
1996-09-03
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Corrosion or damage prevention
376316, 148605, 148644, 134108, 134184, 266134, G21C 1900
Patent
active
055531067
ABSTRACT:
Low temperature water in a low temperature water tank 12 installed outside a reactor pressure vessel 9 is pumped by a high pressure pump 15 and supplied through a conductor 17 under pressure. The supplied water is ejected, as a stream of cold water jet 8, from a nozzle 14 connected to the conductor 17 and introduced into the reactor pressure vessel 9 by a driving mechanism. The stream of cold water jet 8 ejected from the nozzle 14 is directed to impinge against a predetermined position of a core shroud 13 in reactor water 11 filled in the reactor pressure vessel 9 and being at temperature higher than the low temperature water. Then, while continuing to eject the cold water jet 8 from the nozzle 14, the nozzle 14 is moved away from the predetermined position, or the ejection of the cold water jet 8 from the nozzle 14 is stopped, allowing the predetermined position to be heated again with the temperature of the reactor water 11. A thermal shock is thereby applied to the predetermined position for improvement in residual stress of the core shroud 13.
REFERENCES:
patent: 4702880 (1987-10-01), Porowski et al.
patent: 4714053 (1987-12-01), Perry
patent: 4842655 (1989-06-01), Porowski et al.
patent: 4948435 (1990-08-01), Butler et al.
patent: 5305361 (1994-04-01), Enomoto et al.
Amano Kazuo
Enomoto Kunio
Hattori Shigeo
Hayashi Eisaku
Kurosawa Koichi
Babcock-Hitachi Kabushiki Kaisha
Hitachi , Ltd.
Wasil Daniel D.
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