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 Detector-Cooling@cern.ch. 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 Detector-Cooling@cern.ch. 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 Detector-Cooling@cern.ch. 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