New ALARA - PowerPoint Presentation

Slide1

New ALARA recommendationsproposed by the ALARA REVIEW WORKING GROUP (ARWG)

Heinz Vincke on behalf of ARWGLS1 committee meeting 24.05.2013

1Slide2

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

ALARA procedures – 3 levels: If the rad. risk is low <>

very light procedure

If it is medium

<> an optimization effort is

required

If it is

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

2Slide3

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 DIMRsFollow-up of recommendations not systematically doneNo clear guidelines for waiving ALARA committees meetings....

3

DIMR = Dossier d’

Intervention en M

ilieu RadioactifSlide4

ALARA ReviewWorking Group

MEMBERS: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’ R. Catherall I. EfthymiopoulosP

. Bonna

l

4Slide5

ARWG was expected to deliver:Proposal for

ALARA criteriaProposal on how to initiate, to follow up and to archive the DIMRs (for all three levels)Proposal of guidelines for presentations to the ALARA committeeProposal of

procedure waiving an ALARA committee meeting

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ALARA criteria6ALARA CriteriaSlide7

ALARA criteria and levels at CERN:

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ALARA Criteria

risk assessment required ->

RSO and RP decide on ALARA Level

5 mSv

h

ard limits

old

newSlide8

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

8DIMR & WDPSlide9

9DIMR & WDP

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 folderCreate a new work and dose planning documentCreate a new radiological work permitSlide10

IMPACT - DIMR & WDPIMPACT (

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

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DIMR & WDPSlide11

Formal ApproachAll 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 teamIMPACT no documented WDP neededApproval by RSSO/RPEDIMR 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

11LHC experiments apply DIMR/WDP also for Level 1 – integrated into the access request DIMR & WDPSlide12

DIMR & WDPRP=DGS/RPSlide13

Guidelines for presentations in the ALARA committee meeting13ALARA CommitteeSlide14

Guidelines for presentations in the ALARA committeeShort 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). Similar activities on the same installation, REX, etc.Last maintenance performedEnvisaged revisions or replacements in the future

Presentation of the DIMR

–

should contain at least :

Detailed description of major steps of the intervention and the time estimatesResults of mock-up tests and dry-runs (if applicable) justifying the estimated times and working methodsMeasures that have been retained to optimize the intervention (remote handling, local shielding etc …..)Summary of the optimization measures

that were considered but not retainedPresent the ALARA parameters for the optimized and for the non-optimized version of the DIMRAssessment of risks of accidents and incidents and measures that have been taken to minimize these risks

Summary of the intervention

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ALARA CommitteeSlide15

Waiving of an ALARA committee meeting15ALARA CommitteeSlide16

Waiving of the ALARA committee meetingCircumstancesRepetitive intervention

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.16

ALARA CommitteeSlide17

…in case of waivingWaiving 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:

Criteria and LevelsOperational marginsEmergency intervention

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DIMRs &WDP:

Ownership

Procedure to create, check, validate and close

Work optimization process

Retour d’expérience

Controls

Functionality, routing, CERN integration

Contractors, PCR

Approval rounds

Implementation issues

ALARA

committee:

Guideline

for presentations

Frequency

Quorum

Roles

Waiving of the ALARA committee meetingSlide19

19…were approved by S. Myers and R. Tranton 20 April 2013

!Final report(s) from ARWG …

EDMS doc # 1244380Slide20

20Existing 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