NRC Generic Letter 86-08, Availability of Supplement 4 to NUREG-0933, "A Prioritization of Generic Safety Issues"

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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.

8604160013This 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