Transcript Safety during Hardware Commissioning - Indico

SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
Safety during Hardware Commissioning
ELQA Activities
Davide Bozzini on behalf of the ELQA team
AT/MEL-EM
18th October 2007
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
ELQA during Hardware Commissioning
 Tasks
– Electrical qualification of each superconducting circuit, including the
current leads and the active systems connected to the circuit.
– Measurement of electrical parameters of each superconducting circuit
in order to define reference values for the initial operation of the power
converters and for the machine operation.
– Verification of the integrity of the instrumentation used for the
protection of the superconducting magnets and current leads.
 Objectives
– Release each individual superconducting circuit for powering,
– Collect all the necessary electrical parameters for operation.
– Trace all the data acquired.
– Manage the related non conformities.
– Apply the highest level of safety for personnel and equipment
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
Description of the ELQA tests I
See details in LHC-DE-TP-0007 rev 0.1
TP4-A
At
warm
Circuits powered via the DFB
TP4-B
TP4-C
TP4-D
After
During
At
flushing
cool-down
80 K
TP4-E
At
cold
Local dipole orbit corrector
DOC-W
DOC-C
At
At
warm
cold
ORC
HVQ
TFM
ICC
DPC
 ORC OHMIC RESISTANCE
•
The resistance of a circuit is measured between the two current leads.
Maximum current 6 A, maximum voltage 30 V DC.
 HVQ HIGH VOLTAGE QUALIFICATION
•
Each circuit is energized individually with respect to ground using a DC
voltage source limited to a current of 2 mA during charging. The
maximum voltage applied is 1.9 kV DC.
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
Description of the ELQA tests II
 TFM TRANSFER FUNCTION OF THE IMPEDANCE
•
This measurement determines the impedance as a function of
frequency. The impedance is measured at the level of the current
leads by applying a sinusoidal signal with maximum amplitude of 10 V
within a frequency range of 0.1 Hz - 10 kHz.
 ICC CONTINUITY OF INSTRUMENTATION
•
Verifies that the instrumentation for the current lead protection and the
global circuit protection are placed at the right position and are routed
to the right connectors and pins. Certifies the absence of broken or
disconnected instrumentation wires after the cool-down. A DC current
of less than 6 A and maximum 30V is applied.
 DPC DIODE POLARITY CHECK
•
Proves that none of the protection diodes in the three main circuits
(MB, MQF and MQD) is reversed. A DC current of less than 6 A is put
throughout the circuit, the maximum voltage is less of 150 V.
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
Scenarios for the ELQA during hardware commissioning
First cool down
Phase
At
warm
Flushing
Cool down
300 K to 1.9 (4.5) K
At
warm
Cryogenic
conditions
TP4-A
DOC-W
TP4-B
TP4-C
TP4-D
TP4-E
DOC-C
Technical stop of cool down to 80K and warm up
Phase
At
warm
Flushing
At
warm
Cool down
300 K to 80 K
80 K
Warm up
80 K to 300 K
At
Warm
TP4-A
DOC-W
TP4-B
TP4-C
TP4-D
TP4-E
DOC-C
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
High voltage qualification HVQ
 During this tests, voltages up to 1.9 kV dc are applied between circuits and ground.
 The powered circuit (mainly capacitance versus ground) becomes a second generator
as soon as it gets energy stored.
 The HVQ equipment is connected to the live parts of current leads with specific
crocodile connectors IP00. This means that live parts are accessible!
 How we proceed to increase the safety level during this test
– Complete test of the circuits belonging to a electrical safety subsector is fully
automatic.
• After PC switch off and after the warm cable disconnection, all circuits are temporary
grounded on the superconducting side. Here we touch the live parts!
• All circuits are manually connected to a HVQ rack. The circuits are grounded via this rack.
• The temporary grounds are manually removed.
• An automatic application is launched and applies the voltage to a given circuit while the
others remain grounded.
• The discharge is controlled by the system and current to 0 is automatically measured.
• Selection to the next circuit is done automatically via an internal switching board at 0
current. The circuit previously under test is grounded and the next one is open for voltage
application.
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
Definition of electrical safety subsector
 Circuits sharing the same cryogenic environment, which can accidentally come
into contact, shall be considered to belong to the same electrical safety
subsector.
 Circuits closer than 30 cm from circuits shall be defined as being in neighborhood
“voisinage”. (dipole correctors, heater power supply, instrumentation rack and
instrumentation systems).
DFBXH
TP4
D1
1
DFBMB
DOC
QX 600A 120A
3
7
XR8
5
TP4
DFBMI
DFBMJ
DFBAP
ARC
DFBAA
DOC
TP4
DOC
TP4
DOC
TP4
DOC
TP4
Q4 D2 120A
Q5
120A
Q6
120A
Spool LineN Main 6kA
1
6
1
2
1
1
6
MR8
6
19
3
4
120A 60A 6kA LineN
16
94
A81
4
14
DFBLA
TP4
DFBXA
120A 6kA 120A
6
TP4
DOC
4
4
DOC
QX 600A 120A
3
7
LL1
XL1
LL1
XL1
5
powering subsectors
XR8
MR8.Q4
MR8.Q5
A81.Q6
A81
Electrical safety subsector
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
ELQA activities and related risks I
 Electrical
–
Wide geographical extension of the electrical subsectors over few km (arcs).
–
Live parts (current leads) are accessible.
–
Components connected live to a circuit may also be energized (instrumentation
cabling, temperature routing, current lead heating systems…).
–
Most of the test are in the BT regime.
–
Two tests in the HTA regime.
•
HVQ: 1.9 kV dc are applied to the MB circuit.
•
DPC: up to 150 V dc are applied to the MB circuit.
 Working environment
–
Sometimes delicate accessibility to equipment on top of the DFB’s  VIC
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
ELQA activities and related risks II
Where: Local dipole orbit correctors
Protection degree: IP00 live!
When: During ELQA DOC
Risk: Extremely high
Action 1: Fully automatic HVQ test
Action 2: Follow the safety procedure
Where: DFB instrumentation rack
Protection degree: <IP45
When: During ELQA TP4
Risk: low
Action: Do not touch
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
ELQA activities and related risks III
Where: DFB Current leads
Protection degree: IP00 live!
When: During ELQA TP4
Risk: Extremely high
Action 1: Fully automatic HVQ test
Action 2: Follow the safety procedure
Where: IFS instrumentation box and QPS
Protection degree: <IP45
When: During ELQA TP4
Risk: low
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Action: Do not touch
SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
ELQA actors
 The requester: Project Engineer (PE)
– Responsible for:
• Organize and plan ELQA activities.
• Request of intervention to the EIC.
 The Operation Engineer (OE) is the “charge de travaux” hab. B2
– Responsible for:
• Definition of the concerned electrical safety subsectors.
• Determine the list of power converters and heater power supplies to be consigned and switched
off (condamné) and transmit it to the Electrical Circuits Coordinator ECC for execution.
• Check the correct execution done by AB/PO of the consignation step #1. Collect yellow papers.
• Verify the safety measures in place for the execution of the intervention.
• Ensure his own safety and the safety of the intervention team.
• Inform the Electrical Circuits Coordinator ECC of the intervention completion
 The Intervention Team (IT) i.e. “executant electricien” hab. B1
– in charge of:
• The execution of the work / measurements.
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
ELQA actors and other links in matters of safety
People names
Title / activity
????
GLIMOS
Hugues Thiesen
Electrical Circuits Coordinator
John Etheridge & Co.
Health and safety coordinator
AB/PO
Charge de consignation
Maria Paz Casas Linos
Boris Bellesia
Mirko Poyer
Antonio Vergara
Point 2
Point 4
Point 6
Point 8
1-2 , 2-3
3-4 , 4-5
5-6 , 6-7
7-8 , 8-1
Andzej Kotarba (PE)
Vincent Chareyre (PE)
Giorgio D’angelo (PE)
Davide Bozzini (PE)
Piotr Kapusta (OE)
Piotr Jurkiewicz (OE)
Richard Mompo (OE)
Olivier Desebe (OE)
Crew 1
Crew 2
Crew 3
Crew 4
(IT)
A. Jacob, G. Donjon
S. Roguet, L. Godet
HNINP Technicians 4x
HNINP Engineers 4x
EICs / SLIMOSs
Charges de travaux
Executants electriciens/ non
electriciens
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
Execution of an intervention
 Example on how I see it working (not fully in place yet)
Point 4
Health & Safety coord.
APPROVE: Procedure LHC-DE-TP-0007
Vincent Chareyre (PE)
REQUEST of intervention
Boris Bellesia
EIC / SLIMOS
RELEASE: Authorization of intervention
Piotr Jurkiewicz (OE)
Charge de travaux
Hugues Thiesen
PROVIDE: List of Electrical safety
subsectors to be consinged
WAIT FOR: Certificate of step 1 of
consignation (Yellow papers)
ECC
AB/PO
Charge de consignation
SUPERVISE: field activities
ENSURE: Own and team safety
Health & Safety coord.
GREEN LIGHT via a VIC: Common field inspection
Crew 2 (IT)
Executants
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
What else has to be considered
 ELQA on an electrical safety subsector requires
•
Task file including the nature of the test (who, when, where, how)
transmitted to LHC health & safety inspection team.
•
Global access restrictions under the responsibility of TS/HDO.
•
No co-activities allowed during the HVQ qualification test.
•
For the ELQA-DOC tests: the ELQA team in charge of the qualification
takes care of all preparatory work and installation of local restrictions.
•
During the HVQ measurements, where voltages up to 1.9 kV are
applied to the circuit, a member of the ELQA team will be placed in the
energized and potentially accessible areas.
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SAFETY DURING HARDWARE COMMISSIONING, 18 October 2007, D. Bozzini, AT/MEL-EM
References
– Safety policy at CERN (SAPOCO/42),
– Electrical code C1,
– UTE C 18-530, “Carnet de prescriptions de sécurité électrique destine au
personnel habilité”
– LHC-S-ES-0022.01 “Electrical safety rules for the superconducting circuits in
the LHC” EDMS 873256 (engineering check)
– Definition of the safety sub sectors:
http://hcc.web.cern.ch/hcc/safety_subsec.php
– LHC-DE-TP-0007.01 “ELQA Qualification of the superconducting circuits
during hardware commissioning” EDMS 873256 (engineering check)
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