Review of light water reactor regulatory requirements. Identification of regulatory requirements that may have marginal importance to risk. Volume 1

The US Nuclear Regulatory Commission has initiated a program to identify regulatory requirements associated with 10 CFR 50 that, if deleted or appropriately modified, would improve the efficiency and effectiveness of the NRC regulatory program without adversely affecting safety (October 3, 1984, ''Federal Register,'' 49 FR 39066). This report describes the results of a study conducted by Pacific Northwest Laboratory (PNL) to assist the NRC in executing the program. The report identifies 45 regulatory requirements (and associated regulatory guidance) that could potentially be relaxed or eliminated to reduce regulatory burdens without compromising public health and safety. If subsequent, more detailed studies and evaluations confirm these initial findings, NRC staff will recommend and implement appropriate regulatory changes, which may include modification or elimination of some requirements.