Speaker
Description
In the framework of the Neutrino Platform project at CERN, a new experimental area containing two experiments (ProtoDUNEs NP04 and NP02, prototypes of the DUNE detectors) has been built. Both experiments consist of an approximate cubic cryostat of 11 m side filled with liquid argon (LAr) in which a detector of about 6 m side is submerged. The NP04 detector operated with beam at the end of 2018, while NP02 is still under construction. With about 750 tons of LAr contained, NP04 represents the largest LAr TPC detector in the world and the highest concentration of cryogens at CERN.
From design to installation and operation, every stage of this project represents a new challenge in terms of safety, requiring the development of customized procedures and measures to guarantee a safe working environment.
This talk presents the NP04 experiment and its main hazards, i.e. cryogenics, HV, radiations, with the related safety measures applied. In addition, it describes the complete CERN validation process for the equipment of an experiment, taking as example the complex cryogenic system of NP04. The documentation, actions and authorizations that have to be provided by the equipment responsible person and by the safety actors are described. These are needed to guarantee the safe functioning of the system in each stage of the validation process, i.e. declaration, design, installation, commissioning and operation.
The experiment safety file, a constantly evolving set of files that accompanies the project along its entire duration, is also described.
