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Extra info for Ageing of Steam Generators (IAEA TECDOC-981)
To date, there have been no tube ruptures due to undetected ODSCC in the tubesheet region. Axial ODSCC at the tube support plates can usually be readily detected with a bobbin coil probe, however, detection of circumferential ODSCC at the tube support plates requires special probes as does the sizing of ODSCC. Also, the evolution of the ODSCC depends significantly on the local environment within the crevice or under the crud, the details of which are often unknown. Therefore, the future crack growth rate cannot always be accurately estimated.
The arrangement of antivibration bars in Combustion Engineering steam generators includes vertical, horizontal, and bat wing strips, as shown in Fig. 8. The CANDU steam generator tube support design has gone through many changes. Older operating units have a carbon steel lattice grid arrangement, or carbon steel trefoil broached plates (see description of Babcock & Wilcox design above). Recent models use an advanced version of the lattice grids made of stainless steel (see Fig. 9). Antivibration (U-bend) supports have also undergone changes, from carbon steel scallop bars (stacked and staggered) to the current stainless steel flat bar type.
As of December 1993, only 11 PWR. plants with RSGs had plugged tubes because of pitting and a few other plants had reported minor pitting degradation of 15% throughwall depth or less (EPRI 1994). However, a few plants have experienced significant pitting degradation including Indian Point Unit 3 (1290 tubes plugged because of pitting in the original steam generators and 3606 tubes sleeved), Kori Unit 1 (804 tubes plugged because of pitting and 1578 tubes sleeved for various reasons), and Millstone Unit 2 (1655 tubes plugged because of pitting in the original steam generators and 5164 tubes sleeved for various reasons).