Summary
A new Innofact poll shows 55% of Germans support returning to nuclear power, a divisive issue influencing coalition talks between the CDU/CSU and SPD.
While 36% oppose the shift, support is strongest among men and in southern and eastern Germany.
About 22% favor restarting recently closed reactors; 32% support building new ones.
Despite nuclear support, 57% still back investment in renewables. The CDU/CSU is exploring feasibility, but the SPD and Greens remain firmly against reversing the nuclear phase-out, citing stability and past policy shifts.
Another big factor is that every plant is effectively a completely custom design. Because of how few nuclear plants are constructed, every new one tends to incorporate technological advancements to enhance safety or efficiency. The design also has to be adapted to the local climate and land layout. This makes every single plant effectively one of a kind.
It also tends to be built by different contractors, involving different vendors and electric utilities every time. Other countries have done better here (e.g. China and France) mostly due to comprehensive government planning: plopping down lots of reactors of the same design, done by the same engineers. Although these countries are not fully escaping cost increases either.
You are completely correct that regulation is also a big factor. Quality assurance and documentation requirements are enormously onerous. This article does a pretty decent job explaining the difficulties.