The Development of a long life control rod in the fast reactor, 1; Development of the control rod for fast reactor and its irradiation test in Joyo

Soga, Tomonori ; Yamamoto, Masaya; Sekine, Takashi ; Aoyama, Takafumi

The standard control rod in the fast reactor bundles the control elements which contain boron carbide pellets as neutron absorber in the stainless steel cladding tube. The lifetime of the control rod in the experimental fast reactor Joyo, is limited to approximately 4010 $^{20}$ /cm $^{3}$ by the Absorber Cladding Mechanical Interaction (ACMI) which originates from relocation and swelling of the boron carbide pellets. The sodium bonded control rod, which has a shroud tube, has been developed to attempt a lifetime extension by solving this problem as a part of the development of control rod in the fast reactor. The first sodium bonded control rod has been used since the 1st operation cycle of MK-III core. The maximum burn-up is achieved to 10010 $^{20}$ /cm $^{3}$ which is approximately 2.5 times of the conventional control rods in Joyo.

Language	:	Japanese
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Meeting title	:	日本原子力学会2008年春の年会
Held date	:	2008/03
Location (city)	:	吹田
Location (country)	:	日本
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Keywords	:	no keyword
Research Facility	:	常陽(高速増殖炉実験炉)
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Registration No. : BB20073143
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