NRC ORDER – —

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.