Development Of Innovating Na Leak Detector On Pipes

International audienceWithin the ASTRID reactor project, CEA, EDF and AREVA NP, have launched a RetD program focused on the low leak rates detection of sodium on pipes. This program is focused on the development of innovating detectors, multilayer-type and Optic Fiber, involving tests in the FUTUNa sodium loop. This loop is designed to produce very accurate sodium leak rates within a range around 1cm$^3$/min, the tests being performed at different temperature (up to 550DC) on large-diameter pipe mock-ups (D 800 mm) at ambient atmosphere. This paper presents the first series of tests carried out with various materials of the first and second layer of the detector. The results are compared and discussed as well as the observations made after removing the mock-ups. The most interesting result of the overall tests is a detection time less than 2 hours for the two types of detectors

Monitoring of single-mode fiber laser heating using Rayleigh scattering and first order fs-PbP fiber Bragg grating

Conference of 25th International Conference on Optical Fiber Sensors, OFS 2017 ; Conference Date: 24 April 2017 Through 28 April 2017; Conference Code:127522International audienceThis paper presents the development of a CO2 laser-based heating system to simulate fast thermal phenomena on high temperature resistant FBGs dedicated to high temperature profiles monitoring within components exposed to hot plasma inside Tokamak. We have demonstrated the reliability of two optical fiber based sensing techniques to control spatial and temporal annealing measurement during high and fast thermal process

Innovating leak detection on conducting fluid pipelines

International audienceCEA (French Commission for Atomic and Alternative Energies) has launched a R&D program focused on leak detection of sodium on industrial ducts aiming at detecting and pinpointing the exact location of fluid leakage along pipelines or on tanks quickly. This R&D program is focused on the development of innovating detectors, Multilayer-type and Optical Fiber Distributed Sensors, involving tests on mock-ups in a dedicated sodium loop settled at CEA-CADARACHE, France. This loop named FUTUNa, is designed to produce very accurate sodium leak rates within a range around 1 cm$^3$/min, the tests being performed at various temperatures (from 180°C up to 550°C) on large-diameter pipe mock-ups (DN 800) under ambient or nitrogen environment.This paper presents the advantages of each innovating detector and series of tests carried out with various materials of the Multilayer-type Detector and different routings of the Optical Fiber Sensor. The relevant results are compared and discussed aswell as the observations made after removing the mock-ups. The most interesting result of the overall tests is a rapid detectiontime for the two types of detectors less than the other conventional wire type leak detection system