Method of inserting nuclear fuel rods in grid assembly
阅读：143发布：2022-01-27
专利汇可以提供Method of inserting nuclear fuel rods in grid assembly专利检索，专利查询，专利分析的服务。并且A method of inserting metal alloy clad nuclear fuel rods in a fuel rod spacer grid assembly without scratching the clad material comprising forming a hoarfrost-like coating on said rods before inserting them in the assembly.，下面是Method of inserting nuclear fuel rods in grid assembly专利的具体信息内容。
1. A method of inserting metal alloy clad nuclear fuel rods in a fuel rod spacer grid assembly substantially without scratching said rods comprising cooling said rods to about 0* C. in a humid atmosphere so as to form a lubricating hoarfrost-like coating on said rods and thereafter inserting said rod in said assembly.
2. Method of claim 1 further comprising cooling said rods to a temperature below about 0* C. and allowing said rods to warm to a temperature between about -10* C. and 0* C. in a humid atmosphere.
3. Method of claim 2 wherein said rods are cooled to a temperature between about -35* C. and 45* C.
4. Method of claim 3 wherein said rods are allowed to warm to a temperature between about -4* C. and 4* C.
5. Method of claim 3 wherein said cooling step includes holding said rods in a dry ice environment for a time sufficient to cool said rods to about -40* C.
6. Method of claim 4 further including holding said rods in a dry ice vapor atmosphere for from about 1 to 3 minutes.
7. Method of claim 1 wherein said metal alloy clad material is zirconium alloy, said alloy having a protective oxide coating.
8. Method of claim 1 wherein said metal alloy clad material is stainless steel.
9. Method of claim 1 wherein said humid atmosphere consists of atmosphere having relative humidity between about 30 and 70 per cent.
10. Method of claim 2 wherein said rods are allowed to warm in a room temperature environment.
11. Method of inserting metal covered nuclear fuel rods subject to being scratched into a grid assembly comprising forming a frost coating on said rods prior to inserting, and thereafter inserting said rods into said assembly.
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