Third-party Application Maintenance of IRSN's gateway, mazarine and SATURNE applications

Third-party Application Maintenance of IRSN's gateway, mazarine and SATURNE applications. The services provided are as follows:The so-called "main" services: - maintenance services under operational conditions;- evolutionary and adaptive maintenance services;- acceptance assistance services;- support, advice and expertise services.the so-called "ancillary" services: - initialization and support services;- reversibility services