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
Download Presentation The PPT/PDF document "GIF++ Access system" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
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