F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
189/24, 257/26,
F16L 3/22 (2006.01) F16L 9/18 (2006.01) G21C 1/20 (2006.01)
Patent
CA 1098845
ABSTRACT To minimise the stresses arising in a nuclear- reactor calandria due to differential axial expansion of the through-tubes consequent on unequal irradiation growth, while yet preserving the structural strength advantage of securing the through-tube ends rigidly to the end plates, the through-tubes are formed with axially alternating regions of greater and lesser wall thickness. The thicker regions provide the required tube stiffness and resistance to internal and/or external fluid pressure, the thinner regions accommodate differential axial growth by providing the necessary axial strain under a reduced axial stress (end load). The different wall thicknesses can be produced by machining (leaving integral thickenings) or by fabrication (provision of separate strengthening rings); and a variant (in either case) is an integral or separately applied continuous spiral thinkening. In e.g., tube boilers, the invention copes in similar manner with differential thermal expansions. -1-
312400
Fetherstonhaugh & Co.
Nuclear Power Company Limited
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