Virtual system engineering is a key driver for nuclear market to ensure the compliance and the safety of the nuclear plant design in regards to stakeholder needs and functional requirements. The 3DEXPERIENCE platform is offering a unique framework dedicated to system engineering to enable effective decision making by modelling & simulating complex behaviour , fast assessment of technical solution performance, innovation, cost and end-to-end view with advanced requirements management to secure and verify specification . The new System Traceability tool, fully integrated in 3DExperience suite, offers enhanced system traceability and provides a collaborative environment to exchange on model content through a Web based interactive interface. A specific demo featuring a pump system design for nuclear plant demonstrates the end to end traceability between external word requirement document, a Simulink model and a Control Build model