"We won't let them wreck our plant," Tata's Dutch steelworkers say

(Repeats Tuesday item)

* Tata losing $15 per tonne on steel made in Europe

* But Dutch operation still manages a profit - sources

* Tata investment came too late for struggling UK plants

* European steel demand stuck below pre-recession levels

* GRAPHIC-Tata Steel's UK, Dutch plants http://tmsnrt.rs/1NVT4jL

By Barbara Lewis and Andy Bruce

IJMUIDEN, Netherlands/LONDON, May 31 (Reuters) - With Tata Steel's troubled British operations up for sale, Dutch workers at its only other European site for primary steelmaking are in defensive mood, and yet the plant may have a bright future.

"We won't let them wreck our plant" is their motto, directed at top managers of the Indian-owned group ; some of the 9,000 staff at the IJmuiden plant on the Dutch North Sea coast even wear it to work on their safety helmets.

The slogan dates from contract talks last year but shows their defiant spirit during uncertain times for a European steel industry beset by overcapacity and cheap Chinese competition.

More than 11,000 jobs are at risk at Tata's British plants but in the Netherlands, IJmuiden has several advantages - not least that it is excluded from the British sale process and, industrial sources say, it makes a profit.

Tata reported an overall loss for its European steelmaking operations of $90 million for the financial year 2015-16, which analysts said equated to $15 per tonne.

The company won't break down the figures but the British operations - including the country's biggest steelworks in the South Wales town of Port Talbot - are estimated to have lost more than a million pounds ($1.5 million) a day.

By contrast, the industrial sources put IJmuiden's profit margins at about three percent, albeit down from around 30 percent in 2007 at the peak of the steel boom that has since turned into a bust.

Dutch trade union leaders say returns would have been higher if Tata's leaders hadn't diverted investment to Britain, in the hope of correcting a history of poor performance and underinvestment in the steel industry there.

"We're very sorry for the English, but they should have invested here," said Peter Kos, a 65-year-old union official who has been a steelworker at IJmuiden since he was 16.

Tata will not disclose all figures, but a spokesman said it has invested 1.5 billion pounds on upgrading the British plants since it bought the Anglo-Dutch steelmaker Corus in 2007 and "broadly the same across the main European operations".

Another Dutch union official said the bulk should have gone to the Netherlands. "If they had invested the money in IJmuiden, we would have been top of the world," said Aad in 't Veld from the FNV federation.