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Journal Articles

Development of prototype reactor maintenance, 3; Application to valves of sodium-cooled reactor prototype

Chikazawa, Yoshitaka; Takaya, Shigeru; Tagawa, Akihiro; Kubo, Shigenobu

Proceedings of 2019 International Congress on Advances in Nuclear Power Plants (ICAPP 2019) (Internet), 6 Pages, 2019/05

A maintenance management required to prototype nuclear power reactors has been developed. One of important mission of a prototype reactor is to develop maintenance program for commercial reactors step by step securing safety. Since operating experience at the early stage is limited, the maintenance program for the prototype reactor should be a progressive one. It has to be modified and improved frequently taking into account R&D insight and operation experiences. Additionally, the maintenance program has to consider features of the prototype reactor even at the early stage. To select maintenance grades on particular components/systems, risk informed and graded approaches are effective. And maintenance programs have to take into account degradation mechanism originally due to reactor features. In this paper, applications for maintenance program on sodium valves of prototype fast breeder reactor Monju are studied as an example of prototype sodium-cooled reactors (SFR).

Journal Articles

Development of high temperature isolation valve for the HTTR hydrogen production system

Nishihara, Tetsuo; Sakaki, Akihiro*; Inagaki, Yoshiyuki; Takami, Kazuo*

Nippon Genshiryoku Gakkai Wabun Rombunshi, 3(4), p.381 - 387, 2004/12

JAERI has been carried out research and development on the HTTR hydrogen production system. One of the key components in this system is a high temperature isolation valve (HTIV) installed on the hot helium gas piping penetrating the reactor containment vessel. Angle valve with inner thermal insulator was selected for HTIV and conceptual design was performed. The structural integrity of HTIV was clarified by the stress analyses. Allowable helium leak rate of HTIV was discussed. Helium leak tests using small-scaled valve seat models were performed to decide the seat surface shape and valve closing force. The test results show that the leak rate of wedge shape seat increased in proportion to the number of simulated temperature and stress cycles loaded on the seat models before helium leak test, however that of flat seat did not depend on the number of cycles. So flat seat is adopted for HTIV. It was found that the seat closing force of 30 MPa is reasonable to meet the allowable helium leak rate.

Journal Articles

Effect of alkali metals on the accuracy of isotope ratio measurement of uranium by ICP-MS

Magara, Masaaki; Sakakibara, Takaaki; Kurosawa, Setsumi; Takahashi, Masato; Sakurai, Satoshi; Hanzawa, Yukiko; Esaka, Fumitaka; Watanabe, Kazuo; Usuda, Shigekazu

Journal of Analytical Atomic Spectrometry, 17(9), p.1157 - 1160, 2002/09

 Times Cited Count:11 Percentile:53.51(Chemistry, Analytical)

no abstracts in English

JAEA Reports

Development of multilayer piezoelectric actuator valve for JT-60

Miyo, Yasuhiko; Hiratsuka, Hajime; Masui, Hiroshi*; Hosogane, Nobuyuki; Miya, Naoyuki

JAERI-Tech 2001-070, 33 Pages, 2001/11

JAERI-Tech-2001-070.pdf:3.02MB

In order to improve the gas injection valve used for the operation of JT-60, a new type of valve (multilayer piezoelectric actuator valve) was developed .The conventional valve (bimorph piezoelectric actuator valve) has been used for 15 years from the beginning of experimental operation in April, 1985. Consequently, it came to be hard to keep the performance of the valve as a gas injector because its driving source, piezoelectric element, has deteriorated by long time use.In the design, it is required:(1) to be hard structure for sheet leak,(2) to allow a repair work at atmosphere side without an air vent of the vacuumvessel,(3) to be more smaller and lighter compaired with the conventional one,(4) to have a high maintenance efficiency. The new valve developed was examined with various tests such as gas flow characteristic test, high magnetic field proof test, high temperature proof test and gas flow rate test for aged deterioration. As a result, the valve with desired performance for JT-60 could be obtained.

Journal Articles

Simultaneous $$alpha$$, $$beta$$/$$gamma$$ and neutron counting with phoswich detectors by using a dual-parameter technique

Yasuda, Kenichiro; Usuda, Shigekazu; Gunji, Hideho

IEEE Transactions on Nuclear Science, 48(4), p.1162 - 1164, 2001/08

 Times Cited Count:5 Percentile:58.98(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Experimental and analytical study on aerosol behavior in WIND project

Hidaka, Akihide; Maruyama, Yu; Igarashi, Minoru*; Hashimoto, Kazuichiro; Sugimoto, Jun

Nuclear Engineering and Design, 200(1-2), p.303 - 315, 2000/08

 Times Cited Count:6 Percentile:55.31

no abstracts in English

JAEA Reports

Analysis of steam generator tube rupture as a severe accident using MELCOR1.8.4

H.Yang*; Hidaka, Akihide; Sugimoto, Jun

JAERI-Tech 99-013, 97 Pages, 1999/03

JAERI-Tech-99-013.pdf:3.24MB

no abstracts in English

JAEA Reports

None

*; *; *; *

JNC-TJ7440 99-001, 151 Pages, 1999/01

JNC-TJ7440-99-001.pdf:10.35MB

no abstracts in English

Journal Articles

Countermeasure against mechanical troubles of a large bore gate valve for JT-60NBI

Ebisawa, Noboru; Ito, Takao

KEK Proceedings 99-17 (CD-ROM), 4 Pages, 1999/00

no abstracts in English

Journal Articles

Replacement of pressure surge tank and vent valves in JMTR

Ishii, Toshimitsu; Ooka, Norikazu; Saito, Junichi; Kobayashi, Shunichi; Takahashi, Kunihiro; Tsukada, Takashi; Iwai, Takashi; Kurosawa, Yoshiaki; Hoshiya, Taiji; Tsuji, Hirokazu

Proceedings of International Symposium on Case Histories on Integrity and Failures in Industry (CHIFI), p.227 - 236, 1999/00

no abstracts in English

JAEA Reports

Analysis of FP aerosol behavior in piping in WIND project (Contract research)

Hidaka, Akihide; Maruyama, Yu; Shibazaki, Hiroaki*; Maeda, Akio; Harada, Yuhei; *; Yoshino, T.*; Sugimoto, Jun

JAERI-Tech 98-026, 83 Pages, 1998/07

JAERI-Tech-98-026.pdf:4.17MB

no abstracts in English

Journal Articles

Radiation discrimination in phoswich detector system

Usuda, Shigekazu

Radioisotopes, 47(3), p.227 - 229, 1998/03

no abstracts in English

Journal Articles

$$alpha$$-$$beta$$ discrimination in liquid scintillation measurement

Kuwabara, Jun; Shimizu, Isamu

Radioisotopes, 47(3), p.222 - 225, 1998/03

no abstracts in English

Journal Articles

Development of Phoswich detectors for simultaneous counting of alpha particles and other radiations (Emitted from actinides)

Usuda, Shigekazu; Yasuda, Kenichiro; Sakurai, Satoshi

Applied Radiation and Isotopes, 49(9-11), p.1131 - 1134, 1998/00

 Times Cited Count:12 Percentile:29.21(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Development of Phoswich detectors for simultaneous radiation counting

Usuda, Shigekazu; Yasuda, Kenichiro

Hoshasen, 24(1), p.59 - 66, 1998/00

no abstracts in English

JAEA Reports

None

*

PNC-TJ7439 97-003, 41 Pages, 1997/03

PNC-TJ7439-97-003.pdf:1.0MB

None

JAEA Reports

JAEA Reports

Structural concept of angle type of hot isolation valve and its test program at an out-of-pile test facility

Hada, Kazuhiko; Fujisaki, Katsuo; *; Shibata, Taiju; Inagaki, Yoshiyuki; Hino, Ryutaro

JAERI-Tech 97-004, 113 Pages, 1997/02

JAERI-Tech-97-004.pdf:3.88MB

no abstracts in English

JAEA Reports

None

*; *; *

PNC-TJ7439 96-005, 83 Pages, 1996/12

PNC-TJ7439-96-005.pdf:1.52MB

no abstracts in English

47 (Records 1-20 displayed on this page)