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Journal Articles

Repair construction in building etc. JMTR

Kusunoki, Hidehiko; Oto, Tsutomu; Asano, Norikazu; Hanakawa, Hiroki

UTNL-R-0483, p.10_7_1 - 10_7_9, 2013/03

no abstracts in English

JAEA Reports

Refurbishment of JMTR pure water facility

Asano, Norikazu; Hanakawa, Hiroki; Kusunoki, Hidehiko; Sato, Shinichi

JAEA-Review 2012-014, 37 Pages, 2012/05


In the refurbishment of JMTR, facilities were classified into which (1) were all updated, (2) were partly updated, and (3) were continuance used by the considerations of the maintenance history, the change parts availability and the latest technology. The JMTR pure water facility was classified into all updated facility based on the consideration. The Update construction was conducted in between FY2007 and FY2008. The refurbishment of JMTR pure water facility is summarized in this report.

JAEA Reports

Renewal of freezer and boiler facilities

Kameyama, Yasuhiko; Yanai, Tomohiro; Sugaya, Naoto; Kusunoki, Hidehiko; Sato, Shinichi; Fukasaku, Akitomi

JAEA-Review 2012-011, 35 Pages, 2012/03


The Japan materials testing reactor (here-in-after "JMTR") was used for irradiation experimental facility such as fuels and materials for commercial reactor. And the JMTR renewal work was started in 2006 and was completed in 2011. In this report, a part of renewal work for (1) freezer and its accompanying pipe and electricity facilities which the purpose of humidification and air-conditioning in the reactor and hot laboratory building, (2) boiler and its accompanying facilities which the purpose of humidification and heating in the reactor, hot laboratory and Alpha Gamma Facility (AGF) is summarized.

JAEA Reports

Activities on the leakage of radioactive substances from buried pipe with cracking

Kameyama, Yasuhiko; Yanai, Tomohiro; Kurosawa, Akihiko; Asano, Norikazu; Hiyama, Kazuhisa; Kusunoki, Hidehiko; Fukasaku, Akitomi

JAEA-Review 2011-017, 19 Pages, 2011/06


The Japan Materials Testing Reactor (JMTR) is a testing reactor dedicated to the irradiation tests of materials and fuels. The JMTR has been in a shutdown period since 2006 for its refurbishment, and will restart in 2011. Water analysis and so on are carried out in the hot experimental room, and sample preparation and measurement for the radiation management are carried out in the radiation control room. The waste fluid such as hand-wash water, sample water, washing water generated in these rooms is transferred to the waste tank in the hot machine room through the buried pipe. The crack was found at the flange of the buried pipe when sewerage works were carried out. The flange is located in a non-controlled area. A small amount of radionuclide (cesium 137 and cobalt 60) was detected as a result of radioactivity measurement from the surrounding soil. In this report, the cause of the leakage from the buried pipe, the countermeasure and the prevention measure are summarized.

JAEA Reports

Verification on integrity of JMTR emergency generator

Hanakawa, Hiroki; Sato, Shinichi; Kusunoki, Hidehiko; Fukasaku, Akitomi; Tobita, Kenji

JAEA-Review 2009-044, 24 Pages, 2010/01


Electric power supply system of JMTR consists of commercial power supply system and emergency power supply system. In the periodical assessment of JMTR, it was concluded that the integrity of the emergency generators were confirmed and the aging effects were to be watching continuously in future. Therefore, prior to the restart of the JMTR, verification on integrity of the generators were carried out in order to confirm the integrity and to determine maintenance plans which run before and after the restart. As a result, the integrity of the generators were confirmed because the electrical degradation was not found. Maintenance plan is determined before JMTR restart. Also it is possible to maintain the integrity of the generators by carrying on the current maintenance plan with periodical overhaul.

JAEA Reports

The Outline of investigation on integrity of JMTR concrete structures, cooling system and utility facilities

Ebisawa, Hiroyuki; Hanakawa, Hiroki; Asano, Norikazu; Kusunoki, Hidehiko; Yanai, Tomohiro; Sato, Shinichi; Miyauchi, Masaru; Oto, Tsutomu; Kimura, Tadashi; Kawamata, Takanori; et al.

JAEA-Technology 2009-030, 165 Pages, 2009/07


The condition of facilities and machinery used continuously were investigated before the renewal work of JMTR on FY 2007. The subjects of investigation were reactor building, primary cooling system tanks, secondary cooling system piping and tower, emergency generator and so on. As the result, it was confirmed that some facilities and machinery were necessary to repair and others were used continuously for long term by maintaining on the long-term maintenance plan. JMTR is planed to renew by the result of this investigation.

Journal Articles

Preliminary survey for recycle of beryllium reflector frames used in the JMTR

Ishitsuka, Etsuo; Nakamichi, Masaru*; Uchida, Munenori*; Kawamura, Hiroshi; Kaminaga, Katsuo; Tsuboi, Kazuaki; Kusunoki, Hidehiko

JAERI-Conf 2004-006, p.262 - 264, 2004/03

no abstracts in English

JAEA Reports

Partial replacement of JMTR beryllium frame

Kaminaga, Katsuo; Tsuboi, Kazuaki; Kusunoki, Hidehiko; Asano, Norikazu; Yanai, Tomohiro

JAERI-Tech 2003-051, 26 Pages, 2003/05


The sixth replacement of beryllium frame has been accomplished for the west and north frame, while the old east frame of fifth generation is preserved for use. JMTR achieved its first criticality in 1968 and has been in operation until today, with an integrated thermal output of 141.454.5 MWd. During that period replacement was carried out 4 times for all the frames, east, west and north. This time, differently from the previous replacement, west and north frames only were manufactured and installed, when the old east frame was left for continuous use, based on the past experience. Such a strategy contributed to reduction of budget and the waste associated.

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