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Journal Articles

Size distribution of aerosols dispersed during plasma cutting of MOX fuel fabrication equipment

Kitamura, Akihiro; Nakamichi, Shinya; Kashiro, Kashio

Hoken Butsuri, 47(1), p.66 - 73, 2012/04

Plasma arc cutting is considered to be one of the effective methods to size reduce facility components. This method produces an electrical arc to cut the metal equipment, and during the cutting, a molten metal is ejected in the form of aerosol, which is blown away from the torch and has a potential to spread all over the environment. In order to confirm the safety use of plasma arc cutting for dismantling activity in plutonium fuel fabricating facility, we have performed experiments to find aerosol size distribution and to confirm effectiveness of HEPA filter during the cutting. Results showed that the activity median aerosol diameter was around 6 micrometers, with a geometric standard deviation of 1.9. Also, radiological survey was conducted on the back surface of HEPA filter and confirmed that the penetration of radioactive aerosol was under detection limit.

Journal Articles

Remote glovebox size reduction in glovebox dismantling facility

Kitamura, Akihiro; Watahiki, Masatoshi; Kashiro, Kashio

Nuclear Engineering and Design, 241(3), p.999 - 1005, 2011/03

 Times Cited Count:5 Percentile:41.32(Nuclear Science & Technology)

Glovebox dismantling facility is a facility to dismantle gloveboxes and recover any residual nuclear fuel material from the gloveboxes. The facility possesses one robotic arm and six master slave manipulator arms to remotely size reduce contaminated gloveboxes. In this paper the facility is described and the size reduction activity procedures are introduced. Data obtained from one of the glovebox size reduction activities, which was done by both remote and manual size reduction methods, was analyzed and a comparison of these two methods is discussed.

Journal Articles

Waste handling activities in glovebox dismantling facility

Kitamura, Akihiro; Okada, Takashi; Kashiro, Kashio; Yoshino, Masanori*; Hirano, Hiroshi*

Proceedings of International Conference on Advanced Nuclear Fuel Cycles and Systems (Global 2007) (CD-ROM), p.531 - 536, 2007/09

We present our waste handling activities in glovebox dismantling facility, installed in Plutonium Fuel Production Facility, Nuclear Fuel Cycle Engineering Laboratories, JAEA. In this facility, we treat only one size gloveboxes (3m$$times$$3m$$times$$1m), but for the future waste treatment, we segregate waste into material categories. We analyzed the data collected for the future decommissioning, waste treatment and waste disposal. We also present the improvements which are already made and will be made in the near future.

Journal Articles

Experiences of Remote Operated Dismantling of Glove-Box

Okada, Takashi; Asazuma, Shinichiro; Kashiro, Kashio; Matsumoto, Masaki

CD-ROM, WM-5214, p.8, 8 Pages, 2005/00

The dismantling activities, which consist of removal of the glove panel, dismantling of the interior equipment and dismantling of the GB body and made up about 45% of the dismantling of the GB in GBDF, could be performed by remote control.

JAEA Reports

Scattering Profiles of Sparks and Combustibility of Filter against Hot Sparks

Tobita, Noriyuki; Okada, Takashi; Kashiro, Kashio; Matsumoto, Masaki; Watahiki, Masatoshi; Nakata, Keiji*; Gonnokami, Kiyomi*

JNC TN8430 2004-001, 125 Pages, 2004/12

JNC-TN8430-2004-001.pdf:143.53MB

An event that a pre-filter burned on fire took place in the glove box dismantlement facility of Plutonium Production Facility, on April 21, 2003. The direct cause of this event was considered to be sparks generated by an abrasive wheel cutter, some of which reached the pre-filter and eventually burned the pre-filter. Further investigation revealed that there exist other deficiencies those of which formed indirect causes of the event, such as the wheel cutter was used without protective cover and adequate shield against sparks was not installed during the operation. To prevent similar event in the future, following corrective actions were introduced. Wheel cutter will not be used without protective cover; Incombustible pre-filter will be used; Shield will be place at the front of the pre-filter. We have conducted series of experimental tests in order to evaluate and confirm the validity of these corrective actions as well as determine the cause of the fire. This report present the results of these tests.

JAEA Reports

Scattering Profiles of Sparks and Combustibility of Filter against Hot Sparks

Asazuma, Shinichiro; Okada, Takashi; Kashiro, Kashio; Matsumoto, Masaki; Nakata, Keiji*; Gonnokami, Kiyomi*; Toda, Rikiya*

JNC TN8430 2003-011, 56 Pages, 2004/01

JNC-TN8430-2003-011.pdf:2.07MB

The glove-box dismantling facility in the Plutonium Fuel Production Facility is developed to dismantle after-service glove-boxes with remote-controlled devices such as an arm-type manipulator. An abrasive wheel cutter, which is used to size reduce the gloveboxes, generates sparks during operation. This dispersing spark was a problem from the fire prevention point of view. A suitable spark control measures for this operation were required. We developed panels to minimize spark dispersion, shields to prevent the income of sparks to the pre-filter, and incombustible pre-filters. The equipment was tested and effectiveness was confirmed. This report provides the results of these tests.

Journal Articles

Dismantling of Gloveboxes for MOX Fuel Production by A Glovebox Dismantling Facility

; Tobita, Noriyuki; Kashiro, Kashio

WM'02, 0 Pages, 2002/00

None

JAEA Reports

Air-tighten test for used glove boxes

Kashiro, Kashio; Matsumoto, Masaki

JNC TN8440 2000-015, 25 Pages, 2000/05

JNC-TN8440-2000-015.pdf:0.87MB

All of the glove boxes in Plutonium Fuel Fabrication facilities are operated after confirming their condition by conducting negative pressure maintenance test and air-tighten test. Although we check the negative pressure maintenance condition before operating glove boxes in a daily basis, we have not been conducted the air-tighten test. Hence, we have conducted air-tighten test using the glove box that will be dismantled in the near future. In order to compare the present data to the criteria of licensing and to the measurement data for new glove box, the test was conducted by leak tightness vessel which is used the competent authority's test for newly constructed equipments. We also have confirmed the leakage condition in case failure of keeping negative pressure. The main results are as follows. (1)No leakage was detected after leaving the glove box 21 days in case failure of keeping negative pressure condition. (2)The measurement result of the air-tighten test was 0.025 vol%/h, and it was confirmed that this result is within the range of licensing criteria (-0.04$$sim$$0.06 vol%/h). (3)The measurement result was also within the error of leak tightness vessel, and it was confirmed that the air-tighten condition was in force within this past 10 years after installing this glove box (the corresponding value for used the competent authority test for newly constructed equipments was 0.019 vol%/h).

JAEA Reports

None

Kashiro, Kashio

PNC TN8440 91-002, 14 Pages, 1991/09

PNC-TN8440-91-002.pdf:0.3MB

None

JAEA Reports

None

Kashiro, Kashio; Miyo, Hiroaki; Asano, Takashi; *; Shinada, Masanori*; *; Oshima, Hirofumi

PNC TN8410 90-054, 203 Pages, 1990/05

PNC-TN8410-90-054.pdf:9.43MB

None

JAEA Reports

None

Oshima, Hirofumi; Miyo, Hiroaki; Asano, Takashi; Kashiro, Kashio; *; Shinada, Masanori*; *

PNC TN8410 89-015, 41 Pages, 1989/02

PNC-TN8410-89-015.pdf:1.23MB

None

Oral presentation

Behavior of MOX aerosol generated by plasma arc cutting

Nakamichi, Shinya; Kitamura, Akihiro; Yanagawa, Chihiro; Nakai, Koji; Okada, Takashi; Asazuma, Shinichiro; Kashiro, Kashio

no journal, , 

no abstracts in English

12 (Records 1-12 displayed on this page)
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