Stress-Strain State Evaluation of a Welded Joint of Hot Collector to Nozzle of NPP Steam Generator PGV-1000

Stress-strain state of the header-steam generator connector weldment induced by local thermal treatment

“…4a). It should be noted that in this area the stress distribution pattern under operating loads is similar [3].…”

“…Stress-strain state kinetics in the local circular portion of the connector, with stress relaxation brought to completion, is schematized with line 1 2 3 − ′ − ′ (Fig. 3).…”

“…tensile stresses are formed in a plastically deformed circular portion (stress-strain state variation along line [2][3]. It is suggested that the rigidity of the connector portions adjacent to its circular portion plastically deformed with compression (along line 1-2) is sufficient to restore the weldment dimensions on cooling.…”

Effect of the layout of small-and large-series WWER-1000 reactors of nuclear power plants on the stress-strain state of the header-steam generator connector weldment

“…Moreover, the analysis of structure heating with the account of thermal expansion of steam generator components in hydrostatic tests, under normal operating conditions, in main circulation pump (MCP) tests revealed an additional factor of weldment loading, viz the bending moment in the bend plane of the hot branch of the main circulation pipeline (MCL) as a result of uncompensated thermal expansion of structural components. Refined stress-strain state calculations for this unit with the use of three-dimensional models accounting for the bending moment confirmed an essential effect of the latter on its maximum stress intensity [2].…”

“…Analysis of the weldment design identical for the reactors of both series was performed earlier [2]. Thus, only the differences in their layout would be examined.…”