Which Emergency Classification Level is described as actual or imminent substantial core degradation or melting with potential for loss of containment integrity?

Which Emergency Classification Level is described as actual or imminent substantial core degradation or melting with potential for loss of containment integrity?

• A. Alert
• B. General Emergency
• C. Notification of Unusual Event
• D. Site Area Emergency

Answer: (B)

This item tests recognizing the emergency level defined by actual or imminent substantial core degradation or melting with potential loss of containment integrity. That description aligns with the Site Area Emergency level. It signals that the reactor core is severely degraded and containment could be compromised, which means significant safety actions are required at the plant and may extend to surrounding areas. It’s a step below the highest level, which is reserved for scenarios with large, offsite radiological releases or imminent nationwide impact. Lower levels cover less severe conditions: an event with limited safety significance and no core damage falls under the least category, while another level is for the most extreme situation involving large releases and broad protective actions. The Site Area Emergency specifically captures the seriousness of substantial core degradation with a risk to containment, making it the best match for the described scenario.

This item tests recognizing the emergency level defined by actual or imminent substantial core degradation or melting with potential loss of containment integrity. That description aligns with the Site Area Emergency level. It signals that the reactor core is severely degraded and containment could be compromised, which means significant safety actions are required at the plant and may extend to surrounding areas. It’s a step below the highest level, which is reserved for scenarios with large, offsite radiological releases or imminent nationwide impact.

Lower levels cover less severe conditions: an event with limited safety significance and no core damage falls under the least category, while another level is for the most extreme situation involving large releases and broad protective actions. The Site Area Emergency specifically captures the seriousness of substantial core degradation with a risk to containment, making it the best match for the described scenario.