UTC(OP) Based on LNE-SYRTE Primary Frequency Standards: Five Years of Continuous Operation

We describe the operation and the performances of the French time scale UTC(OP) since the change of its design in October 2012. The new UTC(OP) is based on an active H-maser steered using LNE-SYRTE atomic fountains frequency calibrations. Later on, the generation and distribution systems were entirely rebuilt to improve the short term stability and the robustness of the time scale and to provide redundancy. With the new design, UTC(OP) remains close to UTC within a few ns. This paper is focussed on the performances of the time scale and on the major events encountered.