Sample holder assembly for effective thermal conductivity measurement of pebble-bed in laser flash apparatus

Patent metadata

Field	Value
Publication number	US-10928338-B2
Application number	US-201815983593-A
Country	US
Kind code	B2
Filing date	May 18, 2018
Priority date	Apr 3, 2018
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

The present disclosure provides a sample holder assembly for a laser flash apparatus for measuring a thermal conductivity of a pebble-bed, the assembly comprising: a tubular sample container configured to be mounted on a sample carrier tube for the laser flash apparatus, wherein the sample container has open top and bottom; a bottom disc disposed in the sample container to block the open bottom of the sample container and configured for delivering a laser from a laser flash unit of the apparatus to a pebble-bed; the pebble-bed packed on the bottom disc to a predetermined thickness; and a top disc disposed on the pebble-bed and in the sample container to block the open top of the sample container and configured for receiving heat from the pebble-bed to transfer the heat upward.

First claim

The invention claimed is:

1. A sample holder assembly for a laser flash apparatus for measuring a thermal conductivity of a pebble-bed, the assembly comprising:
a tubular sample container configured to be mounted on a sample carrier tube for the laser flash apparatus, wherein the sample container has open top and bottom;
a bottom disc disposed in the sample container to block the open bottom of the sample container and configured for delivering a laser from a laser flash unit of the apparatus to a pebble-bed;
the pebble-bed packed on the bottom disc to a predetermined thickness; and
a top disc disposed on the pebble-bed and in the sample container to block the open top of the sample container and configured for receiving heat from the pebble-bed to transfer the heat upward,
wherein the assembly further comprises a tubular load ring having an outer diameter smaller than an inner diameter of the sample container so as to press the top disc toward the bottom disc to pack the pebble-bed,
wherein the sample container has an annular inner step extending inwardly from an inner face of the container,
wherein a bottom face of the annular inner step of the sample container is mounted on the sample carrier tube such that the sample holder assembly is mounted on the sample carrier tube,
wherein the assembly further includes a quartz disc disposed on a top face of the annular inner step, wherein the bottom disc, the pebble-bed and the top disc are sequentially stacked on the quartz disc,
wherein the assembly further includes a side ring disposed between outer side faces of the bottom disc, the pebble-bed, the top disc, and the load ring and an inner face of the sample container, wherein the side ring is configured for blocking heat transmission from the packed pebble-bed to the inner face of the container,
wherein the tubular load ring has a hat brim extending radially outwardly from a first end of the load ring opposite a second end thereof inserted in the sample container, wherein the hat brim covers the sample container.

2. The sample holder assembly of claim 1 , wherein the side ring is made of quartz or concrete.

3. The sample holder assembly of claim 1 , wherein each of the top and bottom discs is made of graphite.

4. The sample holder assembly of claim 1 , wherein the sample container is made of graphite.

5. The sample holder assembly of claim 1 , wherein each of the sample container, the top and bottom discs is made of graphite, wherein the side ring is made of quartz.

Assignees

• Korea Basic Science Inst

Inventors

• Park Yi-Hyun
• CHO Seungyon
• Ahn Mu-Young
• Lee Youngmin
• Ku Duck Young

Classifications

• G21C17/021

  Solid moderators testing, e.g. graphite · CPC title

• G01N25/18 Primary

  by investigating thermal conductivity (by calorimetry G01N25/20; by measuring change of resistance of an electrically-heated body G01N27/18) · CPC title

• G21C17/066

  Control of spherical elements · CPC title

• G21B1/13

  First wall; Blanket; Divertor · CPC title

• G21C17/06

  Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination (G21C17/08, G21C17/10 take precedence; detecting leaking fuel elements during reactor operation G21C17/04) · CPC title