# NRC CAL – NOV (Yellow)
> **EA-11-226** · CAL · Issued 2011-12-06 · Reactor Licensees
## Action
- **EA Number:** EA-11-226
- **Licensee:** NOV (Yellow)
- **Category:** Reactor Licensees
- **Action type:** CAL
- **Date issued:** 2011-12-06
## Description

On December 6, 2011, the NRC issued a Notice of Violation to Duke Energy Carolinas, LLC for a violation of Title 10 of the Code of Federal Regulations, Part 50, Appendix B, Criterion III, "Design Control," associated with a Yellow Significance Determination Process finding involving Duke Energy’s failure to perform a review for suitability of application of equipment essential to safety-related functions of structures, systems, and components. Specifically, Oconee personnel failed to maintain the Standby Shutdown Facility pressurizer heater breakers and associated electrical components in accordance with the licensing and design basis of the plant, which resulted in the Standby Shutdown Facility being inoperable from 1983, until June 1, 2011.

## Source
- [Full enforcement letter (PDF)](https://www.nrc.gov/docs/ML1134/ML11340A139.pdf)
- [NRC Reactor Licensees index](https://www.nrc.gov/reading-rm/doc-collections/enforcement/actions/reactors/)
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