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A&T Seminar
Feedback and lessons learnt from ALARA Level III interventions in the EN department during LS1
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Europe/Zurich
500/1-001 - Main Auditorium (CERN)
Description
The ALARA framework for CERN was formalised in 2006 [1] and has gradually improved the way interventions in radiation areas at CERN are conducted.
This talk shows how the experience from almost a decade of ALARA practice at CERN was used to bring the ALARA Level III projects during the first LHC long shutdown (LS1) to a successful end. Several large repair, consolidation and maintenance projects were carried out in high radiation areas to prepare the injector chain for the next LHC run and to improve the reliability of CERN's fixed target facilities.
Through examples from three selected projects (the LSS1 cable exchange, the ISOLDE robot exchange and the TDC2 consolidation works), the application of the ALARA principle to the preparation and execution phases are presented. Unexpected events that occurred during the execution, as well as how they were overcome, are shown. The lessons learned from the LS1 ALARA Level III interventions are then presented and used to define guidelines for a better design of high radiation areas.
Based on the LS1 ALARA experience and the best practices already in use, an EN departmental note was released late 2014 [2] providing the EN procedure for preparation, execution, monitoring and closing of interventions in radiation areas. This procedure will be applied during upcoming end-of-year shutdown periods as well as during the next LHC shutdown (LS2) to obtain increased efficiency, lower personnel doses and safer interventions.
[1] EDMS 810169, "L’approche ALARA au CERN".
[2] EDMS 1449602, "Management of ALARA interventions in the Engineering Department”.
ATS Seminars Organisers: H. Burkhardt (BE), M. Modena (TE), T. Stora (EN)
Coffee / tea will be served after the seminar in "salle des pas perdus" near the Auditorium