Baseline Risk Index for Initiating Events (BRIIE) (NUREG/CR-6932, INL/EXT-06-11950)

On this page:

Download complete document

Publication Information

Manuscript Completed: May 2007
Date Published:  June 2007

Prepared by:
S.A. Eidel1, T.E. Wierman1, C.D. Gentillon1
D.M. Rasmuson2
C.L. Atwood3

1Idaho National Laboratory
Risk, Reliability and NRC Programs Department
Idaho Falls, ID 83415

3Statwood Consulting
2905 Covington Road
Silver Spring, MD 20910

D.M. Rasmuson, Technical Monitor

Prepared for:
2Division of Risk Assessment and Special Projects
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001
NRC Job Code Y6546

Availability Notice


This report summarizes an effort to enhance the U.S. Nuclear Regulatory Commission Industry Trends Program in the area of initiating events. The proposed enhancement is termed the Baseline Risk Index for Initiating Events (BRIIE). The BRIIE includes two tiers. Tier 1 involves the monitoring of individual initiating events at the industry level against performance-based prediction limits, while Tier 2 involves an integrated, risk-informed indicator at the industry level that combines the risks from individual initiating events. Technical bases for decisions made in the development of the BRIIE are also presented, as well as historical results at both the Tier 1 and Tier 2 levels.

Page Last Reviewed/Updated Wednesday, March 29, 2023