United States Nuclear Regulatory Commission - Protecting People and the Environment

Availability of Supplement 1 to NUREG-0933,"A Prioritization of Generic Safety Issues" (Generic Letter No. 84-19)

                               UNITED STATES 
                       NUCLEAR REGULATORY COMMISSION 
                           WASHINGTON, D.C. 20555 

                               August 6, 1984 

TO ALL LICENSEES OF OPERATING REACTORS, APPLICANTS FOR OPERATING LICENSES, 
AND HOLDERS OF CONSTRUCTION PERMITS 

Gentlemen: 

SUBJECT:  AVAILABILITY OF SUPPLEMENT 1 TO NUREG-0933, "A PRIORITIZATION OF 
          GENERIC SAFETY ISSUES" (Generic Letter No. 84-19)  

This letter is to inform you that Supplement 1 to NUREG-0933, "A 
Prioritization of Generic Safety Issues," will be published in July 1984, 
and may be purchased by calling (301) 492-9530 or by writing the NRC/GPO 
Sales Program, Division of Technical Information and Document Control, U.S. 
Nuclear Regulatory Commission, Washington, D.C. 20555, or the National 
Technical Information Service, Department of Commerce, 5258 Port Royal Road,
Springfield, VA 22161. 

The Supplement presents the priority rankings for generic safety issues 
related to nuclear power plants. The purpose of these rankings is to assist 
in the timely and efficient allocation of NRC resources for the resolution 
of those safety issues that have a significant potential for reducing risk. 
The safety priority rankings of HIGH, MEDIUM, LOW, and DROP have been 
assigned on the basis of risk significance estimates, the ratio of risk to 
costs and other impacts estimated to result if resolutions of the safety 
issues were implemented, and the consideration of uncertainties and other 
quantitative or qualitative factors, as discussed in the Introduction of the
report. To the extent practical, estimates are quantitative. Although 
changes to nuclear power plant designs or operation are assumed, the sole 
purpose in prioritizing the issues is to estimate costs and other impacts 
that might result if such changes were implemented. 

The priority rankings in the report are based on generic assessments, i.e., 
assessments of plants thought to be typical of a class of plants. Thus, the 
safety significance of an issue might be greater (or less) for a specific 
plant because of features of the design or operation that are different from
those assumed in the generic assessments. 

The Supplement contains: (1) the issues that have been resolved since 
publication of NUREG-0933 in December 1983; (2) the issues that have beer) 
removed from further consideration by the NRC (i.e., those issues with LOW 
or DROP priority rankings); and (3) the issues that are in the process of 
resolution (i.e., those issues nearly resolved or with HIGH or MEDIUM 
priority rankings). 



8408070110 
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                                    - 2 - 

This letter does not contain any new requirements or guidance for licensees 
of operating reactors, applicants for operating licenses, and holders of 
construction permits. No reply is required. 


                              Darrell G. Eisenhut, Director 
                              Division of Licensing 
                              Office of Nuclear Reactor Regulation 
.
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