STOCKHOLM, June 29 (Reuters) - Swedish nuclear reactor maker Blykalla has signed a preliminary agreement with Hitachi Energy to collaborate on deploying Blykalla's small modular reactors, it said on Monday.

• The memorandum of understanding includes cooperation on designs for grid connection and network integration, on-site electrical architecture and digital tools for construction and operation.

• The two companies said they were focusing initially on customers with the highest power demands, beginning with data centres and energy-intensive industry.

• In May, Blykalla said it planned to build a reactor park near the eastern Swedish city of Gavle with six of its 55-megawatt reactors. The reactors, which are still being developed, use an updated version of lead-cooling technology developed for Russian nuclear submarines in the 1950s.

• Last month, it applied to a government scheme offering cheap loans and price guarantees for nuclear developers.