NEA Studsvik Cladding Integrity Project (SCIP-3)

Phase I of the Studsvik Cladding Integrity Project (SCIP) started in July 2004 and was completed in June 2009. It utilised the hot cell facilities and expertise available at the Swedish Studsvik establishment in order to assess material properties and determine conditions that can lead to fuel failures.

A second phase of this project (SCIP-2) started in July 2009 and was completed in June 2014. It was built on the considerable knowledge generated in the previous SCIP programme. The goal of the second phase was to generate high quality experimental data to improve the understanding of the dominant failure mechanisms for water reactor fuels and to devise means for reducing fuel failures. The major focus had been on cladding failures that are caused by pellet-cladding mechanical interaction, especially stress corrosion and hydrogen-assisted fracture mechanisms, as well as on the propagation of cladding cracks.

The scope and objectives of the programme have been established following extensive discussions within the SCIP community, including a dedicated workshop in June 2013. Based on the results of the workshop and the current needs and interests of the SCIP community, the continuation of the third phase of the SCIP project has the following objectives:

SCIP-3 started in July 2014 and aims to study loss-of-coolant accident (LOCA) and off-normal temperature transients from a safety and operational point of view. There will also be a smaller part related to pellet cladding interaction (PCI) failures. Modelling is essential and will be an integral part of the project. LOCA-related matters will consume about 70% of the budget, PCI will make use of about 15% and about 5% of the budget will be dedicated to modelling. The remaining 10% of the budget will not be allocated at the start of the program. This part of the budget will be a reserve to cover changes and/or extensions of the scope of work during the project.

In SCIP-3, members from the entire nuclear community from many countries meet to share understanding, experience and knowledge. Representatives from regulatory bodies, utilities, vendors and research organizations establish a common understanding, enabling a shared view on safety matters, operational concerns and mechanisms of different phenomena, thus facilitating a safer and more economical production of nuclear electricity.


The project is supported by safety organisations, research laboratories and industry from the following countries: Czech Republic, Finland, France, Germany, Japan, Norway, Korea, Russian Federation, Spain, Sweden, Switzerland, the United Kingdom and the United States. The signature phase is not finished (more countries to join).

Project period

July 2014 to June 2019


About EUR 1.67 million per year for the members

Related links


Last reviewed: 13 December 2016