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Journal Articles

Neutron emission spectrum from gold excited with 16.6 MeV linearly polarized monoenergetic photons

Kirihara, Yoichi; Nakashima, Hiroshi; Sanami, Toshiya*; Namito, Yoshihito*; Itoga, Toshiro*; Miyamoto, Shuji*; Takemoto, Akinori*; Yamaguchi, Masashi*; Asano, Yoshihiro*

Journal of Nuclear Science and Technology, 57(4), p.444 - 456, 2020/04

https://doi.org/10.1080/00223131.2019.1691073

Times Cited Count：8 Percentile：65.31(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Development of a detector for measuring effective dose (equivalent) for external photon exposures in natural environment

Tsutsumi, Masahiro; Saito, Kimiaki; Moriuchi, Shigeru*

Journal of Nuclear Science and Technology, 37(3), p.300 - 306, 2000/03

https://doi.org/10.3327/jnst.37.300

no abstracts in English

JAEA Reports

Development of high-pressure ice brasting method (II) (Confirmation of most auitable condition for decontamination)

Fukui, Yasutaka; ; Tanimoto, Kenichi; Terunuma, Seiichi

PNC TN9410 94-033, 86 Pages, 1994/01

PNC-TN9410-94-033.pdf:33.14MB

It is must deceasse the pool risk for the radio active wastes. So it is necessary to decontaminate the wastes low level (500Sv/h) during control the secendry wastes. Exfoliation velocity (aria of exfoliated paint per unit time) was measured on various cndition changed parameter brasting pressure, feed rate, stand off distance between nozzle and waste surface, angle of nozzle, therefore most suitable condition for decontamination was decide on high-pressure ice brasting method, results are as follows. (1)Feeding dry-ice pellets of most suitable condition was decided on that brasting pressure is 15Kgf/cm $^{2}$ , feed rate is 30%. Same exfolation ability was gained on condition that brasting pressure is 15Kgf/cm $^{2}$ , feed rate is 50%. (2)Brasting dry-ice flow of most suitable condition was dicided on that stand off distance is between 50㎜ and 100㎜ angle of nozzle is 30 $^{circ}$ with vertical. (3)In case of a pipe form, exfolation ability was gained on condition that angle of nozzle is 60 $^{circ}$ with vertical after the waste was settled on the turn-table and turning. In case of angle iron form, on condition that angle of nozzle was 0 $^{circ}$ or 60 $^{circ}$ with vertical. In case of inner can on condition that angle of nozzle was 45 $^{circ}$ with axis. When these were such small parts as bolts in the barrel basket which leand 30 $^{circ}$ with vertical and turned 120rpm, exfolation ability was gained on condition that angle of nozzle was vertical. (4)In decontamination hood designing, negative pressure was maintaind in the cell, and freeze preventing heat capacity of ventilation filter (-78 $^{circ}$ C) was calculated at 73kw.

JAEA Reports

Investigation on thermohydraulics optimization in the lower plenum of large scale FBR

;

PNC TN9410 93-092, 93 Pages, 1993/04

PNC-TN9410-93-092.pdf:4.85MB

In-vessel thermohydraulic analysis using a multi-dimensional code AQUA was conducted to investigate thermohydralic conditions in the lower plenum of a large scale liquid metal fast breeder reactor (LMFBR). In the investigation, it was focused in a effective mixing volume in the plenum and in a loose parts trapping by hydraulic forces. Through the analysis by the AQUA code and discussions based on their results, the following results have been obtained: [In-Flow Allotment Characteristics at the Truss] (1)Mass flow rate between lower flow holes and side flow holes to the truss was balanced in the case of 22.5 $^{circ}$ for the coolant inlet angle to the plenum under a full flow condition. (2)The above result did not change with the transient conditions simulating a manual reactor trip event. [Effective Mixing volume] (1)From the transient calculation, it was clear that the effective mixing volume was corresponded to 77-79% of the total volume in the plenum. [Loose Parts Trapping] (1)A condition (W1.0m/s) to trap loose parts by hydraulic forces was not satisfied under parametric calculations only considered here.

JAEA Reports

None

Oka, Yoshiaki*

PNC TJ2602 87-002, 30 Pages, 1987/03

PNC-TJ2602-87-002.pdf:2.07MB

no abstracts in English

Oral presentation