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RISS 인기검색어
- 검색키워드
- 저자 : Zvonkov, A. (검색결과 3 건)
- 무료
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Shutdown dose rate contribution from diagnostics in ITER upper port 18
Cheon, M.S.,Pak, S.,An, Y.H.,Seon, C.R.,Lee, H.G.,Bertalot, L.,Krasilnikov, V.,Zvonkov, A. North-Holland ; Elsevier Science Ltd 2016 Fusion engineering and design Vol.109 No.1
D-T operation of ITER plasma will produce high-energy fusion neutrons those can activate materials around the place where human-access is necessary. The interspace of the diagnostic port is one of the area where human-access is necessary for the maintenance of diagnostic systems installed at the port, so it is important to evaluate a dose rate of the interspace area in order to comply with ALARA principle. The shutdown dose rate (SDR) in the interspace of ITER upper port 18 was evaluated by the Direct 1-Step (D1S) method using MCNP5 code. This port contains three diagnostics: Vacuum Ultra-Violet (VUV) Spectrometer, Neutron Activation System (NAS), and Upper Vertical Neutron Camera (UVNC). The contribution of each diagnostic in the port was evaluated by running separate upper port MCNP models those contain individual diagnostic only, and the total dose rate contribution was evaluated with the model which was fully integrated with all the diagnostics. The effect of the opening around the upper port plug and of the other ports was also investigated. The purpose of this assessment is to provide the shielding design basis for the preliminary design of the diagnostic integration in the port. The method and result of the calculation will be presented in this paper.
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Vorpahl, Christian,Alekseev, Andrey,Arshad, Shakeib,Hatae, Takaki,Khodak, Andrei,Klabacha, Jonathan,Le Guern, Frederic,Mukhin, Eugene,Pak, Sunil,Seon, Changrae,Smith, Mark,Yatsuka, Eiichi,Zvonkov, Ale North-Holland 2017 Fusion engineering and design Vol.123 No.-
<P><B>Abstract</B></P> <P>Numerous plasma-near mirrors of optical diagnostics in ITER require protection from erosion and deposition caused by impinging particles. This is achieved by 63 Diagnostic Shutters, which shall operate in vacuum under high thermal and neutron fluxes over 20 years without maintenance, ruling out standard engineering solutions. In fact, these conditions are unprecedented even on fusion devices. Hence, qualification R&D efforts are extensive, because if a shutter fails, so does the respective diagnostic.</P> <P>Shutter design tasks are widespread among Domestic Agencies and their suppliers, because every shutter is part of the diagnostic it shall protect when not in use. However, as these highly resembling systems have obvious synergy potential, a coordination strategy for all ITER shutters was implemented at IO.</P> <P>An extensive shutter experience collection including failure reports from 14 fusion devices was performed. These are summarized in the present work. For the first time, the state-of-the-art of shutters is thereby defined and assessed as to its applicability to ITER. Furthermore, design-driving environmental effects due to the specific operating conditions are recalled and evaluated. The findings of both assessments are put into context with the current designs of all ITER shutters. In a next step, these are reviewed with emphasis on synergies between different shutter systems. Finally, recommendations on necessary prototyping and generic components are given.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Plasma-near first mirrors of ITER optical diagnostics are protected by 63 so-called <I>Diagnostic Shutters.</I> </LI> <LI> Harsh conditions rule out standard engineering solutions. </LI> <LI> If a shutter fails, so does its diagnostic, impeding ITER operation. </LI> <LI> As a design starting point, the state-of-the-art was defined by an extensive experience collection, the most frequent causes of failure being increased friction, standard mechanical problems and operational loads. </LI> <LI> All current ITER shutter designs were reviewed, yielding a limited set of <I>critical</I> components: Actuators, bearings and vacuum feedthroughs. </LI> <LI> Consequent recommendations for necessary R&D in an integrated strategy for all shutters are presented. </LI> </UL> </P>
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Engineering issues on the diagnostic port integration in ITER upper port 18
Pak, S.,Bertalot, L.,Cheon, M.S.,Giacomin, T.,Heemskerk, C.J.M.,Koning, J.F.,Lee, H.G.,Nemtcev, G.,Ronden, D.M.S.,Seon, C.R.,Udintsev, V.,Yukhnov, N.,Zvonkov, A. North-Holland ; Elsevier Science Ltd 2016 Fusion engineering and design Vol.109 No.1
The upper port #18 (UP18) in ITER hosts three diagnostic systems: the neutron activation system, the Vacuum Ultra-Violet spectrometer system, and the vertical neutron camera. These diagnostics are integrated into three infrastructures in the port: the upper port plug, interspace support structure and port cell support structure. The port integration in UP18 is at the preliminary design stage and the current design of the infrastructure as well as the diagnostic integration is described here. The engineering issues related to neutron shielding and maintenance are addressed and the design approach is suggested.
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