1. Lali Tchelidze Safety work package leader
Accelerator/Safety
Lali Tchelidze
Safety work package leader
April 22, 2015

2. Overview Safety work package – expertise and responsibilities
Working scope
Current and future tasks
Summary

3. Safety work package Resources: Expertise:
2 full time employees
1 part-time employee
2 part-time employees (time limited)
A senior consultant (planned - time limited)
Expertise:
Radiation safety/Monte-Carlo codes
Two parallel accelerator models in MARS and FLUKA, additionally the front-end model in MCNPX
General safety (including cryogenic safety, fire safety, electrical safety, etc.)
Role: advise and propose solutions to ACCSYS project management and ES&H
Meetings: bi-weekly

4. Working scope Examples: Re-evaluation of the linac tunnel HVAC system.
To assist integration/CF work
To support licensing process with SSM, directly involved in specific discussions
Answer ESHAC recommendations (nine recommendations identified during the last meeting)
To be involved in design reviews and WP annual audits
Various other activities
Examples:
Re-evaluation of the linac tunnel HVAC system.
Composition of the actual clay material used in the construction.
Strategy for waste handling.
Centralized zoning approach.
Cryogenic safety: plan for documenting, reviewing and approving cryogenic systems.
Participation in upcoming design reviews and audits
Participation in preparation of ESS safety policies

5. Some tasks, 2015 Prompt Radiation Shielding
Slope in berm, filling material
Stubs for RF and cables
HEBT loading bay
Front end building
A2T raster system cable penetration
Activation & Residual Dose Levels
Beam-line activation
Activation of cooling water in WL
Tunnel air activation
General Safety Activities
Tunnel HVAC system
Smoke extraction system/fire safety strategy
ODH policy and strategy
ADD A CUSTOMER TO EACH TASK

6. Dealing with tasks
Task assignment and follow-up is done in RADSF* JIRA (also in various boards). (* Username: essreviewer, pass: AR22015)
Clear purpose, specific goals, specific dates.
Final technical notes reviewed and approved in CHESS.

7. Accelerator Safety and Radioprotection Home
Link: Accelerator Safety and Radioprotection *
* Username: essreviewer
Pass: AR22015

8. Accelerator shielding
“Baseline” shielding design
ESS
Stub chamfers
Cryogenic distribution line vent
Modified HEBT loading bay
Slope in berm
Backfill material
Front-end building
Pipes for HVAC
A2T penetration
Approved ESS linac prompt radiation shield design criteria:
ESS by L. Tchelidze
ESS by L. Tchelidze
“Baseline” shielding design (both analytical and Monte-Carlo analysis):
ESS by L. Tchelidze
ESS by L. Tchelidze
ESS by E. Pitcher
Procedures: ESS Procedure for designing shielding for safety (as from March 18, 2015)
ESS by G. Muhrer
Pictures demonstrating changes

9. Geometry status Main model – in MARS (L. Tchelidze, M. Jarosz)
Parallel model – in FLUKA (L. Esposito, L. Lari)
Warm linac model – in MCNPX (R. Bevilacqua)
L. Esposito
R. Bevilacqua
M. Jarosz

10. Other safety issues Assessment of the tunnel ventilation system
Confinement classification (ISO-17873) based on DAC
Minimum depression level
Radiological requirements
Fire-control and ODH control requirements
Fire safety
Fire loads assessment in the tunnel – no sprinklers required
Similar work ongoing for klystron gallery
Smoke extraction
Cryogenic safety (ESHAC recommendation!)
ODH calculations model to assess risks
Safety documentation to be submitted to ES&H
List of mitigation measures
Working group in place

11. Summary-1
A safety group in accelerator division to support/answer safety questions & issues related to the accelerator
We have expertise to deal with both general safety and radiation safety issues
We have expertise to run Monte-Carlo simulations as needed
Serves as an advisory group to ACCSYS project management and ES&H
In charge to:
Address shielding/radio-protection issues
Address general safety issues
Support ES&H division in licensing process
Answer ESHAC recommendations
Be involved in PDR, CDR, WP-s annual audit
Support development of ESS safety manual

12. Summary-2 Done: On-going:
First iteration for assessment of the change requests for shielding
Front-end building (partially)
HEBT loading bay and stubs (partially)
Emergency exit in A2T area
Smoke evacuation design from prompt radiation point of view
Cryogenic vent line
Filling material
A2T cable penetration
On-going:
Updating MARS and FLUKA models
Detailed MC simulations to verify layout for radiation shielding
MC simulations for activation studies
ODH policy and strategy
Ventilation system
Smoke extraction system

13. Thank you!