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New ALARA recommendations

proposed by the ALARA REVIEW WORKING GROUP

(ARWG)

Heinz Vincke on behalf of ARWGLS1 committee meeting 24.05.2013

Classification of interventions in radiation areas until now - 5 criteria, 3

levels

ALARA procedures – 3 levels:o If the rad. risk is low <> very light procedure

o If it is medium <> an optimization effort is required

o If it is high <> an optimization effort is required, the procedure will be submitted to and presented at the ALARA committee

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Retour d’experience until

2011/2012Many positive examples prove that job optimization (reduction in dose to personnel) was, is and has to remain the main goal.

But

• All DIMR Level III are prepared, not all DIMR Level II

• ALARA criteria are questioned

• No coherent approach in A&T departments and LHC experiments for Level I interventions

• RP act(ed) as “owner” of DIMRs

• Follow-up of recommendations not systematically done

• No clear guidelines for waiving ALARA committees meetings.

• ...

DIMR = Dossier d’Intervention en Milieu Radioactif

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ALARA Review

Working GroupMEMBERS:

Chair: H. Vincke (DGS/RP)Sc. Sec.: T. Wijnands (EN/HDO)

• RP (including RP group leader)

• RSOs from all departments and from the LHC experiments (GLIMOS from ATLAS repl. ATLAS RSO)

• ‘experts/user’ o R. Catherall o I. Efthymiopouloso P. Bonnal

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ARWG was expected to

deliver:

• Proposal for ALARA criteria

• Proposal on how to initiate, to follow up and to archive the DIMRs (for all three levels)

• Proposal of guidelines for presentations to the ALARA committee

• Proposal of procedure waiving an ALARA committee meeting

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ALARA criteria

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ALARA criteria and levels at CERN:

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risk

assessm

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d ->

RSO and RP decid

e on ALARA

Level

5 mSv

hard limits

old new

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DIMR & WDPDossier d’Intervention en Milieu Radioactif & Work and Dose Planning

DIM

R &

WD

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DIM

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2006-2008:DIMR (Dossier d’Intervention en Milieu Radioactif)

Started in 2009: DIMR based on a SharePoint site –

…. to edit and store work and dose planning documents

• Create a new work and dose planning folder

• Create a new work and dose planning document

• Create a new radiological work permit

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IMPACT - DIMR & WDP

IMPACT (Intervention Management Planning & Activity Coordination Tool), is a general tool to manage work and activities + related aspects, i.e. planning, infrastructure, co-activities, permits, requests and documentation.

ARWG also strongly supported the idea to use IMPACT for DIMRs and they have been implemented into IMPACT already

DIM

R &

WD

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Formal Approach

All work needs to be announced to superintendent (Work Planning coordinators for experiments)

RP, RSOs/GLIMOS and the superintendents (Work Planning coordinators for experiments) check the list of works and make a ‘first’ DIMR level classification.

DIMR Level 1: • Work planning by maintenance/repair team• IMPACT no documented WDP needed• Approval by RSSO/RPE

DIMR Level 2 and 3:• Work and dose planning by maintenance/repair team, RP and RSO/RSSO• Approval by department GL, RSO, RP for DIMR Level II• If DIMR Level 3 -> ALARA Committee• IMPACT with DIMR

LHC experiments apply DIMR/WDP also for Level 1 – integrated into the access request

DIM

R &

WD

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DIMR & WDP RP=DGS/RP

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Guidelines for presentations in the ALARA committee meeting

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Guidelines for presentations in the ALARA committee

• Short description of intervention and the type (planned, unanticipated, urgent unanticipated)

• Justification of intervention & consequences in case the intervention does not take place

• Put the intervention into context using events in the past (if applicable).

o Similar activities on the same installation, REX, etc.

o Last maintenance performed

o Envisaged revisions or replacements in the future

• Presentation of the DIMR – should contain at least :

o Detailed description of major steps of the intervention and the time estimates

o Results of mock-up tests and dry-runs (if applicable) justifying the estimated times and working methods

o Measures that have been retained to optimize the intervention (remote handling, local shielding etc …..)

o Summary of the optimization measures that were considered but not retained

o Present the ALARA parameters for the optimized and for the non-optimized version of the DIMR

o Assessment of risks of accidents and incidents and measures that have been taken to minimize these risks

• Summary of the intervention14

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Waiving of an ALARA committee meeting

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Waiving of the ALARA committee meeting

Circumstances• Repetitive intervention

o A procedure has been worked out under which circumstances a waiving of the ALARA committee meeting could be possible – valid for interventions approved already once in the ALARA committee.

• Urgent maintenance/repair

Suggestion: generic DIMRs should be worked out and approved a priori in an ALARA committee meeting.

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…in case of waiving

• Waiving of the ALARA committee meeting has to be recorded

• This action shall also be noted in the DIMR. • The outcome will be presented in the next

Radiation Safety Officer Committee (RSOC) meeting

• ... and summarized in the next ALARA committee meeting.

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The ARWG discussed and looked into

proposals for:

• ALARA criteria:o Criteria and Levels

o Operational margins

o Emergency intervention

• DIMRs &WDP:o Ownershipo Procedure to create, check,

validate and closeo Work optimization processo Retour d’expérienceo Controlso Functionality, routing, CERN

integrationo Contractors, PCRo Approval roundso Implementation issues

• ALARA committee:o Guideline for presentationso Frequencyo Quorumo Roleso Waiving of the ALARA committee

meeting

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…were approved by S. Myers and R. Trant

on 20 April 2013!

Final report(s) from ARWG …

EDMS doc # 1244380

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Existing ALARA documents (EDMS 825353, 810178 and 810176) will be combined into a single document and updated with the recommendations from the ARWG

Next steps

+

The new rules have become effective on 20. April 2013