METHODS FOR END CAPPING ZIRCONIUM-CLAD REACTOR FUEL PINS
As part of a development program conducted for Atomic Power Development Assoeiates, several methods for attaching end eaps to fuel pins were studied. The method providing the best seal involved the use of a fuel pin in which the core was recessed to receive an end-cap insert that was attached and sealed by arc welding. The strength of the resuiting end cap-to-fuel pin joint was low because all loading was supported only by the 4-mil thick cladding. Resistance- upset butt welding using sleeves to limit outward upset gave the strongest end cap-to-fuel pin joints. However, contamination of the fuel-pin surface or exposure of the core alloy at the weld joint was observed in nearly every int made by resistance welding. The joint design ring most consistent results was one in which the fuel pin was beveled slightly and welded to a flat end cap. Very little end preparation of the fuel pins was required for resistance welding. Of the other methods explored, the mechanical attachment of end caps by a recessedjoint design and a grooved end-cap insert, offered some promise. With this type of joint design only a mechanical seal is formed and only about half the strength of end caps attached by arc welding was obtained. (auth)
- Research Organization:
- Battelle Memorial Inst., Columbus, Ohio
- NSA Number:
- NSA-13-009055
- OSTI ID:
- 4293251
- Journal Information:
- Welding J. (N.Y.), Vol. Vol: 38; Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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