# NRC ORDER – —
> **EA-12-152** · ORDER · Issued 2012-09-21 · Reactor Licensees
## Action
- **EA Number:** EA-12-152
- **Licensee:** —
- **Category:** Reactor Licensees
- **Action type:** ORDER
- **Date issued:** 2012-09-21
## Description

On September 21, 2012, the NRC issued a Notice of Violation to Wolf Creek Nuclear Operating Corporation (Wolf Creek) for a violation of Technical Specification 5.4.1(a) and Regulatory Guide 1.33, Appendix A, Section 9.a, associated with a Yellow Significance Determination Process finding. The finding involved Wolf Creek’s failure to implement maintenance that affected safety-related equipment in accordance with written procedures. Specifically, although required by a work order, Wolf Creek failed to install insulating sleeves on two splices associated with a startup transformer protective relay circuit. The startup transformer subsequently experienced a trip and lockout during a plant trip because the two uninsulated wires touched and provided a false high phase differential signal to the protective relaying circuit. The protective lockout caused prolonged loss of offsite power to all Train B equipment and all non-safety related buses.

## Source
- [Full enforcement letter (PDF)](https://www.nrc.gov/docs/ML1226/ML12265A310.pdf)
- [NRC Reactor Licensees index](https://www.nrc.gov/reading-rm/doc-collections/enforcement/actions/reactors/)
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