Accelerator/Safety

Lali TchelidzeSafety work package leader

www.europeanspallationsource.seApril 22, 2015

Overview

• Safety work package – expertise and responsibilities

• Working scope

• Current and future tasks

• Summary

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Safety work package

• Resources:• 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

Working scope

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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

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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

Dealing with tasks

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• 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.

Accelerator Safety and Radioprotection Home

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Link: Accelerator Safety and Radioprotection *

* Username: essreviewer Pass: AR22015

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Accelerator shielding

“Baseline” shielding

designESS-0007143

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-0008309 by L. Tchelidze• ESS-0008351 by L. Tchelidze

• “Baseline” shielding design (both analytical and Monte-Carlo analysis):

• ESS-0007143 by L. Tchelidze• ESS-0011759 by L. Tchelidze• ESS-0013575 by E. Pitcher

• Procedures: ESS Procedure for designing shielding for safety (as from March 18, 2015)

• ESS-0019931 by G. Muhrer

• Pictures demonstrating changes

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)

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M. Jarosz

L. Esposito

R. Bevilacqua

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

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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

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Summary-2

• Done: • 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

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Thank you!