SECTION 4: RISK ASSESSMENT
EXTENT The International Atomic Energy Association (IAEA) developed the International Nuclear and Radiological Event Scale to quantify the magnitude of radiological events. This scale is logarithmic, meaning each increasing level represents a 10-fold increase in severity compared to the previous level. Figure 4.36 – International Nuclear and Radiological Event Scale
Source: International Atomic Energy Association
Impact: 4 – Catastrophic
Spatial Extent: 2 – Small HISTORICAL OCCURRENCES
As reported in the 2023 State Hazard Mitigation Plan, Harris Nuclear Plant is one of only three plants in the country to have had no Nuclear Regulatory Commission findings as of February 2024. Therefore, there are no recent historical occurrences of any serious incidents at the Harris Plant. However, there have been events that warranted emergency declarations at both the Harris Nuclear Plant and the PULSTAR research reactor at North Carolina State University. Table 4.137 lists emergency declarations reported at the Harris Nuclear Plant between 1986 and 2023. Table 4.137 – Emergency Declarations at Harris Nuclear Plant, 1986 – 2023
Emergency Declaration
Date
Description
Loss of greater than 50% of main control board (MCB) alarms due to electrical problems; normal power supply to annunciator panel failed and did not transfer to its backup inverter. Fire on “B” Main Electrical Transformer; release of flammable gas in the Protected Area. Loss of ERFIS computer system to display Safety Parameter Display System (SPDS) (55 lapsed minutes).
Alert
08/12/1988
Alert
10/09/1988
Unusual Event 11/28/1986
Wake County, NC Multi-Jurisdictional Hazard Mitigation Plan
WSP June 2024 Page 260
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