A majority of the five-member Nuclear Regulatory Commission is signaling that it wants to move slowly on at least some new recommendations from its staff on how to reduce the chance of a Fukushima-type accident at an American reactor despite calls by its chairman for swift action. Three commissioners are resisting a proposal by the chairman, Gregory B. Jaczko, that the commission act promptly on all the recommendations, which were issued last week by a team of six senior staff members. Mr. Jaczko said that because this task force had completed its evaluation in 90 days, the commissioners should be able to decide within a similar time frame what changes to make in safety regulations, although the reforms themselves would take longer. This is not the first indication of conflict within the agency. After an inquiry, the commission