They can't peak independently, but their reliability and low marginal cost means that they can are well suited to providing peaking capacity in conjunction with

They can't peak independently, but their reliability and low marginal cost means that they can are well suited to providing peaking capacity in conjunction with storage. Excess power from the reactor can be used to place energy in the storage source, which is then discharged during peak load. Due to the reliability of the nuclear generator, the amount of storage required can be relatively small.