Having successfully provided stud-tensioning technology all around the world for 60 years, Siempelkamp NIS has established  a strong reputation for opening and closing reactor pressure vessels and other primary circuit components. As one of the nuclear ventures of the Siempelkamp Group with a staff of over 3,000, the nuclear ventures are active in nuclear  power plants all over the world and offer a proven and tested top quality service package for nuclear power plants. 

Siempelkamp NIS /Tensioning Systems has developed a solid position in the stud-tensioning market thanks to the high levels  of skill and education possessed by its design and service engineers, and an uninterrupted service supply chain. All customized solutions for stud-tensioning equipment are commissioned by the company's service department, which consists of 40  engineers and technicians who carry out maintenance on stud-tensioning systems intervals and at the request of the customer 24-hour service – worldwide.