ESHAC #9 Update on ESS General Safety Objectives and Categorization of Workers and Public

1. ESHAC #9Update on ESS General Safety Objectives and Categorization of Workers and Public 2018-10-01 Thomas Hansson & Francois Javier, ESH

2. ESS General Safety Objectives (GSO) Existing version; ESS-0000004 rev 5

3. ESS General Safety Objectives (GSO) Existing version; ESS-0000004 rev 5, Table 2 Rad workers with safety task Rad workers without safety task GSO rev 6 “Safety task” means credited actions performed by a worker in order to reach the facility “Safe state” and comply with objectives for public. Not for workers.

4. ESS General Safety Objectives (GSO) Draft version; ESS-0000004 rev 6 Draft In black defined by SSM, and in blue established by ESS.

5. Plan protective action (H2-H3-H4A) - Exposed workers, without safety task example Redesign System of interest System design Still to be classified as Worker Safety Function (WSF) and designed according to conventional standards Option: Mitigate event Based on quantitative assessment.No need for workers to act/react. Event • Scope: ionizing radiation. • Qualitative assessment of consequence: • Increase of radiation levels • Increase of contamination levels inside area Redesign Detection & Alert • Physical parameter to detect? • rad/contam. levels or a linked process parameter. • Quantitative assessment needed to set trigger point. Options Detection inside area Alert inside area Alert outside area Alarm: Sound, Light Awareness AwarenessActivedosimeter * Added value with detection/alert? Difference in reaction time? 𝛥t No React Procedures/training always needed. Also check possibility to evacuate. Action Evacuate In all workplaces Quantitative assessment ok? • Acceptable impact (mSv) ? • Criteria needed if to do quantitative assessment • Option 1: established criteria in GSO • Option 2: judgement/criteria case by case Quantitative assessment (Dose to worker) Yes In relevant workplaces based on quantitative assessment In relevant workplaces based on qualitative assessment Yes No

6. Workers - GSO guideline proposal Nota : 1/ Deterministiceffects: relationship betweeneffectsseverity and dosereceived - thresholdexistence: from 100 mSv (ICRP 103) 2/ Stochasticeffects: no relationship betweendose and effectsseveritybut relationship betweendose and likelihoodofoccurenceofeffects – no evidenceofthresholdexistence so useof the precautionaryprinciple (evenif no excesof cancer foundbelow 100 mSv) – ICRP 103 : assuminglinearresponse at lowdoses, the combineddetrimentdue to exces cancer and heritableeffects is around 5% per Sv (cancer : 5.5.10-2 Sv-1 for public and 4.1.10-2 Sv-1 for adult workers/heritableeffects: 0.2.10-2 Sv-1 and 0.1.10-2 Sv-1) 3/ Euratom 2013/56: Emergencyoccupational exposure 100 mSv (500 mSv in exceptional situations)

7. Categorization of people Draft Exposed workers with or without safety task * On-going discussion within ESS if users/scientists can deviate from this rule as long as they stay below 1 mSv and comply with Cat B requirements (training/ dosimeter) but NOT to be officially categorized as Cat B. ESS will only request that the home institute categorize the user/scientist. Note 1: Even if Cat A and B have access to supervised and controlled areas from a radiation point of view, certain areas within supervised and controlled areas might require specifically authorized access for other reasons than radiation and might therefore be fenced-off or equipped with limited access via surrounding doors. Note 2: Non exposed workers are not allowed to work in supervised areas. Neither in controlled areas. Note 3: Visitors and guests are excluded from the structure above, but will be considered as non exposed workers.

8. Thank you! Questions?