The class 1equipmentis veryimportant in the nucleardevice, inthedesignandtestingprocessrequiredtocarry outtheirstressandstrainanalysis, so asto ensuretheirsafety.
As part of my job, I reported alarming inadequacies: in one case high-grade equipment (ASME III, class1) was operated in nuclear power reactors with no accepted safety file, regardless of a previous accident and a half-dozen failures in achieving acceptable design results.