None

Ouchi, Jin; ; Kawamura, Kazuhiro

PNC TN8440 95-044, 148 Pages, 1995/10

PNC-TN8440-95-044.pdf:6.06MB

None

None

Sasage, Kenichi; ; Ouchi, Jin

PNC TN8100 94-003, 337 Pages, 1994/02

PNC-TN8100-94-003.pdf:11.55MB

no abstracts in English

The draing of noble metals in vitrified nuclear waste by a melter with a sloping floor -Research Report on Solidification of High-Level Liquid waste

; Takahashi, Takeshi

PNC TN8410 91-158, 19 Pages, 1991/04

Joule heated ceramic melter has been developed to vitrify high-level liquid wastes (HLLW) from reprocessing nuclear spent fuel at Power Reacter and Nuclear Fuel Development Corporation (PNC). Noble metal elements such as ruthenium, paladium and rhodium are contained as fission products in the HLLW. The operational chracteristics of Joule-heated ceramic melter were studied on the effects of these elements. Two small scale melters with sloped floor were fabricated and tested. The slope was 30 and 45 for each. The operational characteristics including electrode resistance, temperature profile etc. were monitored. The drain efficiency of noble metal elements from the melters during the glass drain operation were evaluated. After the test operation, the melters were cut after cooled with the glass left in the melting cavities, following the termination of the test operations. The sediments of the precipitations of the noble metal elements were evaluated from the sectional observation for the melter. The results from the studies were compared between 30 and 45 slopes and discussed. It was concluded that the 45 sloped floor was clearly effective to drain the noble metal elements and the structure of the 45 sloped floor melter was compatible with some amount of precipitates at the bottom.

Simulation of TVF glass melter operation with forming of thick sediments composed of platinum group elements

Asahi, Yoshimitsu; Nakajima, Masayoshi; Ayame, Yasuo

no journal, , 

no abstracts in English

Study on vitrification plan of high level liquid waste in the TVF, 4; Evaluation of forms and application techniques for the next glass melter

Harashima, Takero; Yamashita, Teruo; Matsumura, Tadayuki; Oyama, Koichi; Ayame, Yasuo; Kodaka, Akira

no journal, , 

no abstracts in English

Development of simulation model for cold-cap of TVF glass melter

Asahi, Yoshimitsu; Kodaka, Akira

no journal, , 

In the glass production of TVF melter, as raw material, fiberglass frit cartridges saturated with HAW are supplied to the melter. A lot of in-melting cartridges float on the molten glass surface and form a layer called cold-cap. A simulation model of the cold-cap, which enables reproduction of temperature distribution was developed. The cold-cap was modeled as a two-phase flow of cartridges and molten glass with fluid-particle interaction. The increasing of the apparent viscosity and the decreasing of joule heat current and thermal conductivity caused by floating cartridges are defined as a function of the concentration of solid particles. By involving these models simultaneously, a simulation in regard to an operation during glass production for the 2nd melter in TVF yields a slow fluid velocity at the cold-cap region and reproduced a thermally isolated layer, and the change of temperature observed at the bottom side of the cold-cap.