technical readiness review of the n-3he experiment
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Technical Readiness Review of the n-3He Experiment. Seppo Penttila ORNL P-div At SNS Jan-10-2014. Technical Readiness Review of the n-3He Experiment. Overall schedule ES&H Radiological issues Tritium contaminated 3He gas. Seppo Penttila ORNL P-div. Schedule:. - PowerPoint PPT PresentationTRANSCRIPT
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Technical Readiness Review of the n-3He Experiment
Seppo PenttilaORNLP-div
At SNSJan-10-2014
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Seppo PenttilaORNLP-div
Technical Readiness Review of the n-3He Experiment Overall schedule
ES&H•Radiological issues•Tritium contaminated 3He gas
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Flow of main tasks in the n-3He construction project
1. Design of components close to be done
2. Procurement / fabrication of components in progress
3. Testing / assembly / integration outside beamline
4. Removal of NPDGamma needs access to beamline
5. Installation in cave as soon as possible
6. IRR process1. completes the construction part of n-3He
Schedule:
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Main components of n-3He experiment
Supermirror polarizer
Lead gammashielding
Solenoid
RF Spin Rotator 3He target/detector
4 x preampenclosures
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Construction and Installation tasks in level 1
Preassembly
Today
Start disassemble NPDGamma
IRR
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Installation Gantt chart in level 3
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ES&H
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Removed NPDGamma components are slightly activated
Activated especially are several Al beam windows and in some extend 48 CsI crystals.
All the removed NPDGamma components will be staged and roped in bldg 8713 for survey, disassembly, and possible shipping.
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Dose Rate Calculations
We have performed preliminary dose estimates with MCNP6 using Remec’s geometry, source term, and shielding package that he used for NPDGamma.
• In NPDGamma neutrons are converted to gamma rays
• In n-3He experiment n-3He capture doesn’t produce gamma rays.
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Radiation Levels - n-3He has two modes of operation
N-3He will have two modes of operation:
1.Alignment with beam – no 3He in target2.Normal production with 3He target
Dose rates have been studied for the both modes of operation
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The 1st task in commissioning is alignment of the detector to beam – beam profile need tobe measured down- and upstream from the apparatuswithout target chamber and RFSR.
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Neutron dose rates with 3He
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Neutron dose rates with 3He
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Neutron dose rates with 3He
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Neutron dose rates with 3He
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Neutron dose rates without 3He
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Photon dose rates with/without 3He
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Photon dose rates with/without 3He
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Photon dose rates with/without 3He
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According to these preliminary dose rate studies, the radiation levels outside the shielding meet the SNS limit.
We will complete the dose rate studies and thenthe SNS Neutronics Analysis group has to verify the results for IRR.
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Tritium contaminated 3He
In experiment we are interested in reactionn +3He -> 3H + 1H
T1/2 =12.3 yr
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After neutron guide neutron flux is 1011 neutrons/s- Supermirror polarizer reduces flux by 2- 5x1010 neutrons/s enter the 3He target chamber- ½-lifetime of triton is 12.3 yr- 5000 h of production
Tritium activity in chamber will be 80 mCi corresponding toabout 1018 tritons = 1.4 micro mole = 4.2 micro gr
For an upper-limit estimate for tritium amount at the end of the experiment:
How much tritium is produced ?
BL-13 flux from guide
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We have to consider:
-Accidental relies of tritium into Target Hall-During experiment sensing wires can break inside the chamber
- we need to open the chamber; pump the contaminated 3He to auxiliary container at SNS/HIFR/?? to fix the problem
-When the experiment is over we want to recover 3He ($$) at USA or -Transport chamber with tritium to Univ. Manitoba / Canada for recovery.
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Chamber is a strong Al vacuum chamber with sst CF flanging – beam windows1 mm thick Al. 3He gas in the chamber is at NTP.
We are in process with SNS to study issues such as;-What happens accidentally released gas-Possibility to pump contaminated 3He into a storage tank at SNS-Regulations for transportation of tritium contaminated gas inside USA and across border to Canada.
For IRR we will create a safety document to cover the tritiumissues.
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