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GIF++ Access system GIF++ Access system

GIF++ Access system - PowerPoint Presentation

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GIF++ Access system - PPT Presentation

Dorothea Pfeiffer GIF Project Meeting 16012013 Thanks to V Martins De Sousa Dos Rios D Vaxelaire D Haasler GIF facility in EHN1 2 16012013 Part Details Gas area Hosts large part of the peripheral infrastructure and services gas supplies and systems ID: 427898

key access turnstile zone access key zone turnstile source dorothea pfeiffer 2013 person ppe people requirements roof database gif

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Slide1

GIF++ Access system

Dorothea Pfeiffer

GIF++ Project Meeting16.01.2013

Thanks to: V.

Martins

De Sousa Dos

Rios, D. Vaxelaire, D. HaaslerSlide2

GIF++ facility in EHN1

2

16.01.2013

Part

Details

Gas

area

Hosts large part of the peripheral infrastructure and services (gas supplies and systems)

Preparation area

Area for detector preparation directly accessible from control room

Bunker (will replace present zone 154)Contains 16.65 TBq Cs-137 source (662 keV gammas) and muon beamControl roomTwo separate control rooms for services and users in barracks R-B84 and R-A81 with direct access to the preparation area

Dorothea Pfeiffer

GIF++ in Secondary

Beams Area

, but due to presence of 16.65

TBq

source and

muon

beam more dangerous than other

installationsSlide3

General Requirements

Dorothea Pfeiffer3

Personal access device: PAD People must be able to enter and leave the zone (very frequently: at times every few minutes)Material access device: MAD Large and heavy detectors must be brought into and removed from the zone by opening the roof or large concrete door (rarely, a few times per month)

Tools and other material must be brought into and out of the zone (several times per week)

16.01.2013Slide4

RP Access System Requirements (EDMS Document 1233302)

Dorothea Pfeiffer4

Source/beam interface requirements (details of source interface needed):Access must not be possible if the source (or the beam) is operational

Operation of the source (and the beam)

must be inhibited and it must be in its parking position if the PAD or the MAD is open or any shielding is removed (if any equipment interlocked with the source

loses its

SAFE condition,

the

source

has to be

sent to it parking position and then

inhibited) Access must be inhibited if radiation levels inside the zone are above a defined threshold which is determined by an interlocked RP monitor inside the irradiation cave(Comments by me in blue)16.01.2013Slide5

RP Access System RequirementsDorothea Pfeiffer

5

Specific requirements for personsControlled entry and exit of each person via a personnel access device (PAD) which excludes the access of more than one person using only a single access token

Entry and exit granted only allowed after badging with a DIS dosimeter. Given the significant hazard posed by the source activity specific access rights might be of advantage to ensure that intervening personnel is aware of the specific hazard

16.01.2013Slide6

Proposed Solution

PPG,

Roof:

If opened, patrol lostPPE & Turnstile: Access rights of people checked, key released and people countedPPE 2: Key that was taken at turnstile has to be used in key access mode (patrol not lost)

MAD: access for material up to PC size

16.01.2013

6

Dorothea Pfeiffer

Personal Protection Exit

Personal Protection Gate

Personal Protection Entry

PPE & TurnstileGIF++ ZonePre Zone

MAD

PPE 2

Small material accessSlide7

Detailed access procedureDorothea Pfeiffer

7

Access without breaking the patrolPrecondition: Zone is patrolled (number of people in zone = 0)User presents his DIS dosimeter in front of the PPE &

turnstile, gets a key from the key distributer,If permission to access is given, the key

has to be turned to unlock the turnstile to enterAt the PPE 2 behind the turnstile the key taken before has to be used in key access mode (like this one avoids that the key is turned at the turnstile, but then left behind so that a second person could enter using the same key)

The turnstile increments the number of users in the zone by one (the information who entered will be written to a database)

To leave the

zone the person will badge again, put the key back and the name will be erased from the database

16.01.2013Slide8

Open questionsDorothea Pfeiffer

8

If the PPX, PPG or roof is opened, the turnstile/database combination cannot control the number of persons in the zone anymore (people could enter/leave via PPX or PPG)Patrol carried out before closing PPG or roof deletes old data from database?The

database is not considered to be a device for safety, only for users access controlPossible to open PPE by turning the key, but then leaving it there (in this case the next person could enter the turnstile but not take the key and subsequently use the key the first person left in the PPE)?

How can (accidental) removal of shielding block or opening of roof be detected? Special locking elements exist, only when veto in CCC is set moving of blocks possible.

16.01.2013