• Before cool down
• Cool down
• Powering test
18/10/2007
M.Solfaroli
1
Before co
ool down
ACTIVITIES
RISKS
• Pressure test
• Cryo valves reconfiguration
• Leak test (with pressure)
• Consolidation
Pressure
• ELQA_TP4A
Electrical
• Purging and Flushing
He+Pressure
• ELQA_TP4B
Electrical
18/10/2007
M.Solfaroli
2
Before cool dow
wn: Pressu
ure test
• High
Hi h pressure in
i the
th CRYO lines
li
• During the week
week-end
end
• Access forbidden to all the areas
involved
• Engineering Specification for
each sector
18/10/2007
M.Solfaroli
3
Removal of mechanical blocking of:
Beforre cool do
own: CRYO
O valves reeconfiguraation
• PV930 and
d CV930 b
between the
h QRL and
d the
h DFBs ((normally
ll closed)
l d)
• CV920 between line C and Cold Mass (normally closed but forced open
during the pressure tests)
NO INTERFERENCES
In the shade of leak tests ((with pressure)
p
)
P
t
Changing of the poppets of the CV910 (before QUI)
This activity must be done only as soon as
all lines have been depressurized
p
((consolidation))
18/10/2007
M.Solfaroli
4
Beforre cool do
own: leak tests and consolidaation
DURING THIS PERIOD:
• The lines can be pressurized and
depressurized on a frequent basis
• Somebody can be touching
a cryogenic circuits
t
NO WORKS ON:
• any line (B, C, D, E, F)
• QUI
• cryogenic part of DFBs
Main actors:
VAC+MCS
helped by ACR
18/10/2007
P
M.Solfaroli
5
WHAT AND WHEN
Before cool dow
wn: ElQA TP4A
• 4 electrical tests on circuits (1 with HT)
• Normally 1 week
• Everything is grounded
NO WORK ON:
• QHPS
• PCs (60A included)
• DFBs
BALISAGE
• DFBs areas fenced off by ElQA team
• PCs areas to be fenced off
LHC-DE-TP-0007-00-10
“ELQA QUALIFICATION OF THE SUPERCONDUCTING
CIRCUITS DURING HARDWARE COMMISSIONING”
EDMS n. 788197
18/10/2007
M.Solfaroli
S also
See
l Davide’s
id ’ slides…
lid
6
Before coo
ol down: P
Purging an
nd Flushing
SITUATION
• Interconnection closed
• Cryogenic circuits closed
• DO NOT OPEN ANYTHING
Possible interferences with
cryo activities
18/10/2007
M.Solfaroli
7
WHAT AND WHEN
Before cool dow
wn: ElQA TP4B
• normally 2 days
• HT (up to 1.9kV)
• Everything
h is grounded
d d
NO WORK ON:
• QHPS
• PCs (60A included)
• DFBs
BALISAGE
• Access to all sector restricted
• PCs areas fenced off by HCC
• DFBs side fenced off by ElQA team
LHC-DE-TP-0007-00-10
“ELQA QUALIFICATION OF THE SUPERCONDUCTING
CIRCUITS DURING HARDWARE COMMISSIONING”
EDMS n. 788197
18/10/2007
M.Solfaroli
See also
l Davide’s
id ’ slides…
lid
8
• Before cool down
• Cool down
• Powering test
18/10/2007
M.Solfaroli
9
ACCESS
300
300K
80
80K
Cool d
down
• Access allowed onlyy to CRYO operators
p
• Access managed by AT/ACR
80K
1.9K
• Access restricted
• Access managed by HCC
• All the intervention MUST be
coordinated and approved by HCC
18/10/2007
M.Solfaroli
10
• Before cool down
• Cool down
• Powering test
18/10/2007
M.Solfaroli
11
• Organization of the HC team
Powerin
ng tests
• Roles
• Responsibilities
See Roberto’s slides…
• Management of safety
• Access to the underground
• Interference between incompatible activities
• Tracking and informing about the activities
18/10/2007
M.Solfaroli
12
P
Powering
tests: safeety – acceess to the underground areass
Personal authorisation using personal CERN access card, after having requested
through EDH the “LHC Hardware Commissioning (LHC-HC)” access zone authorisation.
Special temporary authorisation, using special access cards distributed by the Engineer in
charge (EIC). These cards must be brought back to the EIC once the intervention is
p
completed.
Access key
Blue chip token
Engineering specification LHC-S-ES-0018 rev 0.2
02
“ACCESS PROCEDURES FOR THE LHC TUNNEL AND THE RELATED
UNDERGROUND AREAS DURING POWERING TESTS AND ELQA AT COLD”
EDMS n. 857641
18/10/2007
M.Solfaroli
13
Powerring tests: safety – IInteraction betweeen incomp
patible acttivities
CONSTRAINTS:
• Access to the Uas restricted during all the period of powering;
• Access to the tunnel controlled by HCC during all the period of
powering;
i
• Access to a powering subsector forbidden when a main circuit
is powered above 1kA or the QH are being discharged;
• Access forbidden around the QHPS during IST of the QPS;
• No access to a DFB even when only one circuits located on it is
being powered (balise area);
• Access restricted around the switches of the EE system when a
main circuit is being powered at high level current (noise
protection).
18/10/2007
M.Solfaroli
14
Pow
wering testts: safety – Trackingg and info
orming ab
bout activiities
morning
i shift
hift
afternoon shift
7.00
15.00
16.30
22.00
8 30
8.30
PTC
Point Owner
EIC
All the activities MUST be announced!
18/10/2007
M.Solfaroli
15
Pow
wering testts: safety – Trackingg and info
orming ab
bout activiities
http://p2n.web.cern.ch/p2n/
18/10/2007
M.Solfaroli
16
Pow
wering testts: safety – Trackingg and info
orming ab
bout activiities
What has been already done
18/10/2007
M.Solfaroli
17
Pow
wering testts: safety – Trackingg and info
orming ab
bout activiities
What is happening now
18/10/2007
M.Solfaroli
18
Pow
wering testts: safety – Trackingg and info
orming ab
bout activiities
War Map
TEAMS
18/10/2007
Cryo/DFBs
Light blue
CL team
Green
ElQA team
Yellow
QPS team
Blue
EE
Red
PCs team
Black
RF team
White
M.Solfaroli
19
Conclusions
Conclu
usions
Good coordination is crucial to avoid incidents
All the activities in the field must be
announced and reported
See Roberto’s slides…
18/10/2007
M.Solfaroli
20