RP PROCEDURE FOR FLUID ANALYSIS Detector Cooling Project - 16th June 2011
Heinz Vincke, Nadine Conan DGS/RP..... based on EDMS document #1013826 prepared by Elena Perez Rodriguez (EN/CV)
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Some requests have been made to the Detector Cooling section (EN/CV/DC), to carry out periodical chemical analyses to control the quality of the fluid of its installations.
This document has been done in collaboration with the Chemical Laboratory (TE/VSC/SCC section) and the Radiation Protection group (DGS/RP), and aims to establish a procedure for the periodical analyses of the fluid of all the Detector Cooling installations.
For each installation that requires a chemical analysis, a form (see next slide) has to be filled and signed by the responsible person(s) to activate the sampling procedure.
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ANNEXES: SAMPLING FORM
To start the chemical analyses (the Radiation Protection analyses will be always done)
To be filled by the responsible persons from Experiment, Detector Cooling, Chemical Laboratory and Radiation Protection
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DETECTOR COOLING STATIONS
PFC gas
C3F8
C4F10
PFC liquid
C6F14
Water
Demineralized
Not demineralized
Chemical analyses
Radiation Protection analyses
The Detector Cooling stations can be classified by the kind of refrigerant used. There are three kinds of systems
GENERAL DIAGRAM OF THE INTERVENTION
RP measurement at sampling station
Interventions
Radiation Protection shall approve any intervention before the operation starts.
Three kinds of intervention: Planned intervention: is the intervention that will take
place regularly to know the evolution of the radiation level and the chemical contamination of the fluid.
Non-planned intervention: is the intervention that is urgent from a detector point of view but is not a radiological emergency (for example a pump failure).
Radiological emergency interventions: is the intervention that implies an emergency from a radiological point of view (for example a leak of radioactive fluid).
PLANNED INTERVENTIONS The analysis will be scheduled by Detector Cooling that will assign
the priority to the different stations. The levels of priority will be: very urgent, urgent and not urgent. No direct request from the experiments shall be addressed to the
Radiation Protection Group. The number of analyses to be done will be communicated to
Radiation Protection by Detector Cooling at least 10 days in advance. A preliminary priority order for the stations will also be communicated
by e-mail at this time. The minimum time for the radiological analysis in case of a
planned intervention will be 3 hours and the maximum time will be 2 days for one sample.
After the analyses have been performed, an e-mail with the authorization and the results will be sent to [email protected]. The same information can be consulted later in the Radiation Protection web page.
In case the sample is radioactive, Radiation Protection will evaluate the risks and advice on the best practice to proceed.
NON-PLANNED INTERVENTIONS The time required for the radiological analyses, once the
sample has been taken to the Radiation Protection laboratory, will be a minimum of 3 hours and a maximum of 6 hours during working hours and non-working hours (analysis performed by RP-Piquet). These times are valid for one sample at the time.
To contact Radiation Protection: During working hours phone 75252 (Radiation Protection) During non working hours phone 74848 (fire brigade), the fire
brigade will then phone Radiation Protection. After the analyses have been performed, an e-mail with the
authorization and the results will be sent to [email protected]. The same information can be consulted later in the Radiation Protection web page.
In case the sample is radioactive, Radiation Protection will evaluate the risks and advice on the best practice to proceed.
RADIOLOGICAL EMERGENCY INTERVENTIONS
In case of a radiological emergency intervention, Radiation Protection shall approve the minimum actions to be in a safe situation. No intervention will be done in any station without RP supervision and
approval. Radiation Protection will equip the workers, as the radiological risk would
be present, so they can perform the minimum actions to reduce the risk. In this case, and only for radiological emergency situations, the analysis
can be done in parallel.
The time required for the radiological analyses, once the sample has been taken to the Radiation Protection laboratory, will be a minimum of 3 hours and a maximum of 6 hours during working hours and non-working hours (analysis performed by RP-Piquet). These times are valid for one sample at the time.
To contact Radiation Protection: During working hours phone 75252 (Radiation Protection) During non working hours phone 74848 (fire brigade), the fire brigade will
then phone Radiation Protection.
After the analyses an e-mail with the authorization and the results will be sent to [email protected]. The same information can be consulted later in the Radiation Protection web page.
In case the sample is radioactive, Radiation Protection will evaluate the risks and advice on the best way to proceed.
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SAMPLING PROCEDURE: GASES
One stainless steel bottle for both analyses
• Sampling schema
A C
B
Connection to vacuum pump
Installation Sampling bottle
The sampling will be done by two persons, one from Detector Cooling and another one from Radiation Protection.
As the gas sampling is the most sensitive one, no delegation will be allowed for the gas systems.
To prevent cross contamination in case of radioactive fluid, the person from Detector Cooling will operate the valve while the person from Radiation Protection will manipulate of the bottle.
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SAMPLING PROCEDURE: LIQUIDS
Two plastic bottles, one for each analysis
Not reused no cleaning
• Sampling schemaA
Installation Sampling recipient
The sampling will be done by two persons, one from Detector Cooling and another one from Radiation Protection.
In a case by case basis, this task can be delegated by Radiation Protection to the Radiation Protection Experts (RPE) from the Experiment and by the Detector Cooling team.
PERSONAL PROTECTION EQUIPMENT
Detector Cooling will provide the adequate personal protections for the sampling operation
Is the responsibility of the Radiation Protection Group (DGS/RP) to evaluate the personal protections required. (presently required in red) Light protection latex gloves (SCEM 50.43.20.720.4
) Radioactive waste bags (SCEM 50.46.02.105.1 and
SCEM 50.46.02.109.5) Safety glasses (SCEM 50.49.10.040.0) White suits with hood (SCEM 50.43.90.G) Shoes covers (SCEM 50.43.90.D) Protective mask (SCEM 50.49.20.195.7)
SPARE SLIDE
PFC gas PFC liquid
Water C3F8 C4F10 C6F14
ALICE SPD SSD-SDD ; TPC ; TRD ; HMPID ; TOF-PHOS
ATLAS Evaporative ; SR11 TRT ; Cables ; SR11
Muons A&C ; Tile ; LAr ; Diffusion pumps ;
Rod racks
CMS PS1&2 ; TS1&2 ; SS1&2 ;
Pixel; Brine ; TIF
LHCb IT ; TT ; Rich 1&2 OT
TOTEM Roman Pots
Other NA61, Compass
1 SR1 has no radiation dose expected