Measurement of Shielding Characteristics in the Prototype FBR Monju

Usami, Shin; Sasaki, Katsuhiko; Deshimaru, Takehide; Nakashima, Fumiaki

doi:10.1080/00223131.2000.10874851

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…Such small amount of colemanite used as a coarse aggregate with portland cement resulted in forming a hard mass of plate [7]. Serpentinite being hydrogen-rich with iron, which were effective on neutron slowing-down, was used for concrete in the past, and the typical example was the pedestal concrete shield of the fast breeder demonstration reactor Monju [8]. Since the serpentinite contains harmful asbestos, the authors selected similar hydrogen-rich periotite instead of serpentinite in order to develop the NS concrete: it has been developed with colemanite, peridotite, and ordinary Portland cement by controlling the content of the colemanite up to around 15 wt% of the concrete composition aiming at improved shielding performance and production of the concrete.…”

Section: Development Of the Ns Concretementioning

confidence: 99%

Development of Neutron Shielding Concrete Containing Colemanite and Peridotite

Kawai

Yonemura

Kamiyama

et al. 2020

Proceedings of the 14th International Workshop on Spallation Materials Technology

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This article is published by the Physical Society of Japan under the terms of the Creative Commons Attribution 4.0 License. Any further distribution of this work P r o c e e d i n g s o f t h e 1 4 t h I n t e r n a t i o n a l W o r k s h o p o n S p a l l a t i o n M a t e r i a l s T e c h n o l o g y D o w n l o a d e d f r o m j o u r n a l s. j p s. j p b y 4 4. 2 2 4. 2 5 0. 2 0 0 o n 0 9 / 2 6 / 2 0

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Section: Development Of the Ns Concretementioning

confidence: 99%

Development of Neutron Shielding Concrete Containing Colemanite and Peridotite

Kawai

Yonemura

Kamiyama

et al. 2020

Proceedings of the 14th International Workshop on Spallation Materials Technology

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“…Such small amount of colemanite used as a coarse aggregate with portland cement resulted in forming a hard mass [2]. Serpentinite that was hydrogen-rich was used for concrete in the past, and the most familiar example is the pedestal concrete shield on the reactor vessel in the fast breeder demonstration reactor Monju [5], but we adopted similar hydrogen-rich but harmless periotite instead of serpentinite which was a raw material for a harmful asbestos.…”

Section: Introductionmentioning

confidence: 99%

Novel monolayer shields of a neutron powder diffractometer SPICA at BL09 of J-PARC

Kawai

Yonemura

Torii

et al. 2014

Progress in Nuclear Science and Technology

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A new neutron powder diffractometer, SPICA, at the ninth beamline has been constructed for the study of materials under special environments at J-PARC. We have made shielding design for SPICA with the Monte Carlo transport code system, PHITS, considering shield optimization to reduce amount of shields and to simplify shield configuration. At the first time, a reference design of the optimized multilayer shield was made using conventional shielding materials such as iron, concrete, polyethylene and boric acid resin. Then, novel monolayer shield design has been performed to give equivalent or lower radiation dose rates than those of the reference design by using the new neutron shielding concrete which contains colemanite and peridotite used as a aggregate of concrete. Overall shield thickness saving was also attained in the main shields for the neutron scattering room.

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“…Serpentinite and peridotite rocks contain much hydrogen. Serpentinite was used for neutron shielding concrete on the pedestal concrete shield on the reactor vessel in the fast breeder demonstration reactor Monju, (10) but it is not desirable for outer shields now because serpentinite is also a raw material for asbestos. To realize a compact shield satisfying the radiation dose criteria even in a limited space such as in a hospital, neutron shield concrete using colemanite and peridotite has been developed (11) .…”

Section: Introductionmentioning

confidence: 99%

Activation experiment for concrete blocks using thermal neutrons

Okuno¹,

Tanaka²

2017

EPJ Web Conf.

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Abstract. Activation experiments for ordinary concrete, colemanite-peridotite concrete, B4C-loaded concrete, and limestone concrete are carried out using thermal neutrons. The results reveal that the effective dose for gamma rays from activated nuclides of colemanite-peridotite concrete is lower than that for the other types of concrete. Therefore, colemanite-peridotite concrete is useful for reducing radiation exposure for workers.

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Measurement of Shielding Characteristics in the Prototype FBR Monju

Cited by 7 publications

References 2 publications

Development of Neutron Shielding Concrete Containing Colemanite and Peridotite

Development of Neutron Shielding Concrete Containing Colemanite and Peridotite

Novel monolayer shields of a neutron powder diffractometer SPICA at BL09 of J-PARC

Activation experiment for concrete blocks using thermal neutrons

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