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JAEA Reports

Shielding calculation by PHITS code during replacement works of startup neutron sources for HTTR operation

Shinohara, Masanori; Ishitsuka, Etsuo; Shimazaki, Yosuke; Sawahata, Hiroaki

JAEA-Technology 2016-033, 65 Pages, 2017/01

JAEA-Technology-2016-033.pdf:11.14MB

To reduce the neutron exposure dose for workers during the replacement works of the startup neutron sources of the High Temperature Engineering Test Reactor, calculations of the exposure dose in case of temporary neutron shielding at the bottom of fuels handling machine were carried out by the PHITS code. As a result, it is clear that the dose equivalent rate due to neutron radiation can be reduced to about an order of magnitude by setting a temporary neutron shielding at the bottom of shielding cask for the fuel handling machine. In the actual replacement works, by setting temporary neutron shielding, it was achieved that the cumulative equivalent dose of the workers was reduced to 0.3 man mSv which is less than half of cumulative equivalent dose for the previous replacement works; 0.7 man mSv.

Journal Articles

Development of a heat-resistant neutron shielding resin for the national centralized tokamak

Morioka, Atsuhiko; Sakurai, Shinji; Okuno, Koichi*; Tamai, Hiroshi

Purazuma, Kaku Yugo Gakkai-Shi, 81(9), p.645 - 646, 2005/09

A 300 $$^{circ}$$C heat-resistant neutron shielding material is newly developed, which consists of phenol-based resin with 5 weight-% boron. The neutron shielding performance of the developed resin, examined by the $$^{252}$$Cf neutron source, is almost the same as that of the polyethylene. The resin is applicable to the port section of vacuum vessel of the DD plasma device to suppress the streaming neutrons and to reduce the nuclear heating of the superconducting coils.

Journal Articles

Current status of neutron calibration field of JAERI/FRS

Yoshizawa, Michio

Hokeikyo Nyusu, (29), p.2 - 5, 2002/05

no abstracts in English

Journal Articles

The Equivalent fundamental-mode source

G.D.Spriggs*; R.D.Busch*; Sakurai, Takeshi; Okajima, Shigeaki

Annals of Nuclear Energy, 26(3), p.237 - 264, 1999/00

 Times Cited Count:10 Percentile:62(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Evaluation of scattered neutrons in fast neutron calibration field using $$^{252}$$Cf and $$^{241}$$Am-Be neutron source

J.R.Dumais*; Yoshizawa, Michio; Yamaguchi, Yasuhiro

JAERI-Tech 98-005, 65 Pages, 1998/03

JAERI-Tech-98-005.pdf:2.32MB

no abstracts in English

Journal Articles

Neutron radiography with radioactive source

Ishikawa, Isamu

Radioisotopes, 46(8), p.567 - 572, 1997/08

no abstracts in English

JAEA Reports

Evaluation of influence of intermediate and fast neutrons mixed in a thermal neutron calibration field; Evaluation by using simulation

J.R.Dumais*; Yoshizawa, Michio; Yamaguchi, Yasuhiro

JAERI-Tech 97-033, 35 Pages, 1997/07

JAERI-Tech-97-033.pdf:1.43MB

no abstracts in English

Journal Articles

Applied techniques based on neutron radiation in JAERI

Ishikawa, Isamu

Proc. of 11th KAIF/KNS Annual Conf., 0, p.611 - 619, 1996/00

no abstracts in English

JAEA Reports

Journal Articles

Electronic imaging for Cf-252 based neutron radiography

*; *; *; ; Ishikawa, Isamu

Proc. of 2nd Int. Topical Meeting on Neutron Radiography System Design and Characterization, 0, p.335 - 342, 1995/00

no abstracts in English

Journal Articles

Absolute calibration of the JT-60U neutron monitors using a $$^{252}$$Cf neutron source

Nishitani, Takeo; Takeuchi, Hiroshi; Kondoh, Takashi; Ito, Takao*; Kuriyama, Masaaki; Ikeda, Yujiro; Iguchi, Tetsuo*; Barnes, C. W.*

Review of Scientific Instruments, 63(11), p.5270 - 5278, 1992/11

 Times Cited Count:72 Percentile:97.17(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Gamma rays of short-lived ruthenium nuclides produced in the spontaneous fission of $$^{252}$$Cf

Shinohara, Nobuo; ; *; Tsukada, Kazuaki*; Otsuki, Tsutomu*; J.Alstad*

Radiochimica Acta, 56, p.127 - 131, 1992/00

no abstracts in English

Journal Articles

Development of a computer-controlled on-line rapid ion-exchange separation system

Tsukada, Kazuaki*; Otsuki, Tsutomu*; Sueki, Keisuke*; *; *; *; Nakahara, Hiromichi*; Shinohara, Nobuo; ; Usuda, Shigekazu; et al.

Radiochimica Acta, 51(2), p.77 - 84, 1990/00

no abstracts in English

13 (Records 1-13 displayed on this page)
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