© GMV, 2011 Property of GMV All rights reserved Dependability Procedures for CTA-ACTL CTA Amaya Atencia (GMV) Teo Bernardino (UCM_ELEC/GMV) May 17 th, 2011

© GMV, 2011 PRESENTATION OBJECTIVES The main goals of current presentation are: Introduction to the Risk Assessment Dependability and Safety (RADS) WP in general, and Dependability (Reliability, Availability & Maintainability - RAM) in particular. Justify its necessity as the mean to ensure the reliability requirements in CTA. Present the RADS management policy. 09/06/2016

© GMV, 2011 RADS WP within CTA organization The need for Dependability (RAM) procedures –What is Dependability (RAM)? –Why should it be applied to CTA? –Effort and consequences of NOT applying RAM Dependability procedures RADS management within CTA AGENDA 09/06/2016

© GMV, 2011 Property of GMV All rights reserved Context of RADS WP within CTA A little bit of

© GMV, 2011 RADS WP WITHIN CTA ORGANIZATION 09/06/2016 Risks, DPN and Safety J. M. Miranda Dependability DPN stands for RAM: -Reliability -Availability -Maintainability

© GMV, 2011 Property of GMV All rights reserved RAMS? Why

© GMV, 2011 THE NEED FOR RAM PROCEDURES (I) So, what is Dependability (i.e. RAM)? A system is dependable when it is –available for use when required, –rarely fails when in use, and –when it does fail is easily repaired Are there means to ensure that a system is dependable? >Yes, and are widely used in the industry. 09/06/2016

© GMV, 2011 THE NEED FOR RAM PROCEDURES (II) According to W. Hofmann’s presentation in last CTA meeting at RAL (UK): “CTA telescopes should be 5 times more reliable than current existing ones” In order to meet this requirement, it is mandatory to include procedures to evaluate/improve the dependability of CTA telescopes, i.e., introduce RAM techniques. 09/06/2016

© GMV, 2011 THE NEED FOR RAM PROCEDURES (III) What are the benefits of performing RAM activities in parallel to a system design & implementation? Identification of failure modes. Improvement of design robustness. Avoidance of single failure points (e.g. with redundant systems). Definition of an appropriate maintenance plan –Preventive –Predictive –Reactive 09/06/2016

© GMV, 2011 THE NEED FOR RAM PROCEDURES (IV) RAM assessment within a system is neither cheap, nor effortless: Approximately 5% of the complete manpower of a critical system is spent in RAMS activities However, what would it happen if each single IACT of CTA has a failure rate of 10%? CTA would become a redundant observatory with 90% of the telescopes operational at each time (i.e telescopes would be backup rather than operational) 09/06/2016

© GMV, 2011 Property of GMV All rights reserved PROCEDURES & MANAGEMENT RAMS

© GMV, 2011 Proposed Dependability and Safety procedures: DEPENDABILITY (RAM) PROCEDURES (I) 09/06/2016 Preliminary Hazard Analysis Fault Tree Analysis Failure Mode Effects Analysis EMBT: Estimated Time Between Failures EMTTR: Estimated Mean Time To Repair

© GMV, 2011 RADS MANAGEMENT PROPOSED FOR CTA (I) RADS WP is responsible for the –Elaboration of the RADS documentation –Training of LQM’s –Collecting and reporting the RADS outputs –Coordination with QA and QC WP’s The RADS activities are performed at different levels: RADS management level –Elaboration of RADS plans, templates –Reports on RADS activities at project level LQM level –Implementation of RADS plans on each WP –Reporting on RADS activities at WP level 09/06/2016

© GMV, 2011 RADS MANAGEMENT PROPOSED FOR CTA (II) 09/06/2016 RADS Plans& TemplatesRADS reports Audits Audit reports Training Reporting Checklists on RADS

© GMV, 2011 RADS MANAGEMENT PROPOSED FOR CTA (III) Current RADS on-going activities: Preparation of RADS documentation –Elaboration of RADS plans, templates Training in RAMS techniques –Preparation & instruction of the training courses –Courses adapted for each Work Package Interaction with other WP’s –Contribution to CTA QA plan On demand support to RADS activities 09/06/2016

© GMV, 2011 Property of GMV All rights reserved Thank you! Amaya Teo