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As defined in UG-37(a), F is the correction in the code for the fact that longitudinal stress (circumferential plane) is ½ of the circumferential stress (longitudinal plane). When in the longitudinal plane, the value must be 1.0. In other planes, the value may fall between 0.5 and 1.0 (dependent upon the plane) if the design meets certain requirements: the nozzle is attached to the vessel with full penetration groove welds and the nozzle is integrally reinforced (i.e., no repad).
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