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 Title: |
US4227081:
Method of evaluating the integrity of the outer carbon layer of triso-coated reactor fuel particles
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Caputo, Anthony J.; Knoxville, TN
Costanzo, Dante A.; Oak Ridge, TN
Lackey, Jr., Walter J.; Oak Ridge, TN
Layton, Frank L.; Clinton, TN
Stinton, David P.; Knoxville, TN
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| Assignee: |
The United States of America as represented by the United States Department of Energy, Washington, DC
other patents from UNITED STATES OF AMERICA, DEPARTMENT OF ENERGY (597195) (approx. 6,712)
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| Published / Filed: |
1980-10-07
/ 1979-06-13
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| Application Number: |
US1979000048290
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| IPC Code: |
Advanced:
G21C 3/62;
G21C 17/07;
Core:
G21C 3/42;
G21C 17/06;
IPC-7:
G03B 41/16;
G03C 15/16;
G21C 17/00;
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| ECLA Code: |
G21C3/62J; G21C17/07;
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| U.S. Class: |
Current:
250/302;
376/245;
378/058;
976/DIG.097;
976/DIG.232;
Original:
250/321;
250/323;
250/475.1;
176/019.LD;
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| Field of Search: |
250/321,323,302,320,358 R,475.1
023/230 C
073/104
176/19 LD,91 SP
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| Priority Number: |
| 1979-06-13 |
US1979000048290 |
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| Abstract: |
This invention relates to a method for determining defective final layers of carbon on triso-coated fuel particles and the like. Samples of the particles are subjected to a high temperature treatment with gaseous chlorine and thereafter radiographed. The chlorine penetrates through any defective carbon layer and reacts with the underlying silicon carbide resulting in the volatilization of the silicon as SiCl4 leaving carbon as a porous layer. This porous carbon layer is easily detected by the radiography.
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| Attorney, Agent or Firm: |
Denny, James E. ;
Hamel, Stephen D. ;
Deckelmann, Louis M. ;
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| Primary / Asst. Examiners: |
Smith, Alfred E.; Fields, Carolyn E.
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| Family: |
None
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First Claim:
Show all 2 claims |
What is claimed is:
1. A method for determining the existence of cracks penetrating the respective isotropic vapor-deposited carbon outer coatings covering respective silicon carbide coatings of respective triso-coated fuel particles, comprising the steps of subjecting said outer carbon coatings of said particles to a substantially pure chlorine gas atmosphere at a temperature of about 1500° C. for a selected time period in the range from 1 to 5 hours, cooling said particles, and finally radiographing said cooled particles to determine any change in density of the respective silicon carbide coatings of said particles as a result of any cracks in said outer coatings effecting a reaction between said chlorine gas and said silicon carbide coatings to form low density carbon and volatile silicon chloride, whereby any of said particles having cracks in the outer coating thereof can be readily determined from the resulting radiograph of said particles.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
Show description
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| Forward References: |
Show 5 U.S. patent(s) that reference this one
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