The Behavior of Radiolytically Produced Hydrogen in a High-Level Liquid Waste Tank of a Reprocessing Plant: Hydrogen Concentration in the Ventilated Tank Air

Abstract Tokai Vitrification Facility (TVF) is the first plant in Japan to immobilize the High-Level Liquid Waste (HLLW) transferred from Tokai Reprocessing Plant (TRP) to the borosilicate glass. Two problems happened through the plant operation, and the investigations to solve them are being carried on. One is the deposit that is caused by the cohesion of the dust inside the air-film cooler (a type of the exhaust pipe) of the glass melter and the other is the accumulation of noble metal elements in the HLLW on the melter bottom. The countermeasure for the former is the water injection system and for the latter is the reform of the melter bottom structure.

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Experiments on the leak path factor of ruthenium volatilized from high-level liquid waste tanks in a reprocessing plant in case of the boiling and drying accident

Journal of Nuclear Science and Technology ◽

10.1080/00223131.2014.972476 ◽

2014 ◽

pp. 1-5

Author(s):

Takashi Kodama ◽

Yuki Shibata ◽

Naoki Takahashi ◽

Shingo Matsuoka ◽

Mikio Kumagai ◽

...

Keyword(s):

Liquid Waste ◽

High Level Liquid Waste ◽

Waste Tanks ◽

High Level ◽

Reprocessing Plant ◽

Path Factor

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Modeling on Evaporation Characteristics of a Reprocessing Plant High-Level Liquid Waste Concentrator

Nuclear Technology ◽

10.13182/nt90-a34474 ◽

1990 ◽

Vol 92 (2) ◽

pp. 238-242 ◽

Cited By ~ 7

Author(s):

Masanori Takahashi ◽

Tatsuo Izumida ◽

Fumio Kawamura ◽

Hideo Yusa

Keyword(s):

Liquid Waste ◽

High Level Liquid Waste ◽

High Level ◽

Reprocessing Plant

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Challenges During the Decommissioning of the WAK Site: Dismantling of Highly Contaminated HLLW-Storage Tanks

ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, Volume 2 ◽

10.1115/icem2009-16054 ◽

2009 ◽

Author(s):

Joachim Dux ◽

Oliver Fath

Keyword(s):

Concrete Structures ◽

Liquid Waste ◽

Nuclear Test ◽

Process Equipment ◽

Storage Tanks ◽

Nuclear Fuels ◽

High Level Liquid Waste ◽

Test Operation ◽

High Level ◽

Reprocessing Plant

The German pilot reprocessing plant WAK was shut down in 1990 after reprocessing about 200 Mg of nuclear fuels and is decided to be dismantled completely to the green field until year 2023. During the years 1994 until 2008 approximately 2.000 Mg of partly highly contaminated process equipment and 1.500 Mg of concrete structures corresponding to 99% of the radioactive inventory of 5E14 Bq of the WAK reprocessing building have already been dismantled. A major prerequisite for the complete dismantling of the WAK is the management of the 60 m3 high-level liquid waste (HLLW) with a total β/γ-activity of 8.0E17 Bq resulting from reprocessing. For this purpose the Karlsruhe Vitrification Plant (VEK) was constructed in the years between 2000 and 2005 and inactively tested in 2007. The subsequent nuclear test operation and routine hot operation of the VEK plant are planned to start mid-2009. In parallel to vitrification operation, dismantling of the four HLLW tanks in the storage buildings will be prepared for remote dismantling.

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