The essence of the argument may be correct, however, the basis is not. The stress tests were to great extent based on unrealistic threats like strong earthquake (which are extremely rare – almost non-existent in Europe away from the Mediterranean) or crash of big airplane. In these cases truly, lives could be endangered, however, the possibility of these cases ever occurring is nearly zero. Even if some investments in safety measures were needed (like in case of the safety systems in case of blackout) implementation of those would be substantially lower than phasing out nuclear reactors and building a replacement capacity of equal capacity from renewable sources.