CORRECTED-BRIEF-Nexans says Q1 sales down 11.1 pct like-for-like

(Corrects to show Q1 sales 971 mln euros, not 1.043 bln)

PARIS, April 22 (Reuters) - Nexans SA (NEXS.PA):

* Says Q1 sales at constant metal prices 971 mln euros, down 11.1 pct yr-on-yr in organic terms

* Expects "sizeable upturn" in activity in second quarter

* Sees first-half operating margin at around 4 percent, organic sales drop 4-5 percent

* Sees operating margin and sales improving further in second half