Availability of Supplement 4 to NUREG-0933, "A Prioritization of Generic Safety Issues" (Generic Letter No. 86-08)

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

                               March 25, 1986

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

Gentlemen: 

SUBJECT:  AVAILABILITY OF SUPPLEMENT 4 TO NUREG-0933, "A PRIORITIZATION OF 
          GENERIC SAFETY ISSUES" (GENERIC LETTER 86-08) 

This letter is to inform you that Supplement 4 to NUREG-0933, "A 
Prioritization of Generic Safety Issues," was published in February 1986. 
This 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 
NUREG-0933. To the extent practical, estimates are quantitative. 

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 the 
publication of NUREG-0933 Supplement 3 in July 1985; (2) the issues that 
have been 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). 

NUREG-0933 and its 4 supplements may be purchased by calling (202) 275-2060 
or (202) 275-2171 or by writing to the Superintendent of Documents, U.S 
Government Printing Office, Post Office Box 37082, Washington, D.C. 20013-
7082, or the National Technical Information Service, Department of Commerce,
5258 Port Royal Road, Springfield, VA 22161. 



8604160013 

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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. If you have any questions on the
subject, please contact Ronald Emrit on (301) 492-4576. 

                              Sincerely,  


                              Harold R. Denton, Director 
                              Office of Nuclear Reactor Regulation