Motiva's Port Arthur refinery restarting naphtha complex - sources

(Adds company comment, details on units, work)

HOUSTON, Feb 5 (Reuters) - Motiva Enterprises was restarting the Naphtha Processing Complex on Friday at its 603,000 barrel per day (bpd) Port Arthur, Texas, following repairs that began after a Jan. 27 breakdown, said sources familiar with plant operations.

Motiva plans to complete work on and restart 49,000-bpd Catalytic Reforming Unit 4 at the Port Arthur Refinery next week, which was shut as part of a multi-unit overhaul, the sources said.

The second-largest crude distillation unit - 195,000 bpd VPS-4 - at the Port Arthur refinery, also shut as part of the same overhaul involving CRU 4, is scheduled to restart in the third week of February, the sources said.

A Motiva spokesman declined to talk about the status of specific units at the Port Arthur Refinery.

"Various planned maintenance activities are still underway at Motiva Port Arthur Refinery," said company spokesman Ray Fisher. "Units (HKSE: 0405.HK - news) may be coming back online as maintenance is completed."

The naphtha complex, which includes the 115,000-bpd naphtha hydrotreater, an 85,000-bpd reformer and a 50,000-bpd isomerization unit, was shut to allow repairs to a leaking heater tube in the hydrotreater, sources told Reuters.

Motiva began the planned overhaul of VPS-4, the reformer and a 54,000-bpd coker and ancillary units in the last week of December. The units are expected to restart between mid-February and early March.

The overhaul was rescheduled four times since February 2014 until enough contract workers would be available to carry out the work. (Reporting by Erwin Seba; Editing by James Dalgleish)