HOUSTON, Feb 27 (Reuters) - Lyondell Basell Industries'

will lay off 345 workers, or 86% of the workforce, at

its shuttered Houston refinery on April 17, according to a

filing with the Texas Workforce Commission.

There are around 400 Lyondell employees working at the

263,776 barrel-per-day Houston refinery. About 70% of them are

hourly workers represented by the United Steelworkers union

(USW).

Reuters reported on February 18 that Lyondell Houston

refinery layoffs were expected to begin in mid-April.

A Lyondell spokesperson said the company had no further

information to share, beyond what was discussed during its

fourth-quarter earnings call.

The workforce reduction comes after Lyondell completed the

shutdown of the Houston refinery earlier this month, people

familiar with plant operations told Reuters.

Houston Refining is one of the largest refineries in the

United States designed to process heavy-sulfur crude oil,

according to the company.