환기실에서 의도된 삼중수소 방출 후 삼중수소 거동 시뮬레이션

Simulation of Tritium Behavior after Intended Tritium Release in Ventilated Room

Yasunori IWAI, Takumi HAYASHI, Toshihiko YAMANISHI, Kazuhiro KOBAYASHI & Masataka NISHI

Abstract

일본원자력연구소(JAERI) 산하 삼중수소공정연구소(TPL)에서는 핵융합로의 안전성 확인 및 강화를 위해 12m3의 대형 밀폐용기(Caisson)로 삼중수소 안전 연구(CATS)용 케이슨 조립체를 제작하여 추정 삼중수소 누출 이벤트가 발생해야 하는 경우 삼중수소 거동. 본 연구의 주요 목적 중 하나는 환기실에서 삼중수소 누출 사건이 발생한 후 삼중수소 거동을 예측하기 위한 시뮬레이션 방법을 확립하는 것입니다.

RNG 모델은 허용 가능한 엔지니어링 정밀도로 50m3/h 환기 케이슨에서 맴돌이 흐름 계산에 유효한 것으로 밝혀졌습니다. 의도된 삼중수소 방출 후 계산된 초기 및 제거 삼중수소 농도 이력은 50m3/h 환기 케이슨에서 실험 관찰과 일치했습니다.

환기실의 삼중수소 수송에는 벽 근처의 흐름이 중요한 역할을 하는 것으로 밝혀졌다. 한편, 3,000m3의 삼중수소 취급실에서 의도적으로 방출된 삼중수소 거동은 미일 협력하에 실험적으로 조사되었습니다. 동일한 방법으로 계산된 삼중수소 농도 이력은 실험적 관찰과 일치하였으며, 이는 현재 개발된 방법이 삼중수소 취급실의 실제 규모에 적용될 수 있음을 입증한다.

At the Tritium Process Laboratory (TPL) at the Japan Atomic Energy Research Institute (JAERI), Caisson Assembly for Tritium Safety study (CATS) with 12 m³ of large airtight vessel (Caisson) was fabricated for confirmation and enhancement of fusion reactor safety to estimate tritium behavior in the case where a tritium leak event should happen. One of the principal objectives of the present studies is the establishment of simulation method to predict the tritium behavior after the tritium leak event should happen in a ventilated room. The RNG model was found to be valid for eddy flow calculation in the 50m³/h ventilated Caisson with acceptable engineering precision. The calculated initial and removal tritium concentration histories after intended tritium release were consistent with the experimental observations in the 50 m³/h ventilated Caisson. It is found that the flow near a wall plays an important role for the tritium transport in the ventilated room. On the other hand, tritium behavior intentionally released in the 3,000 m³ of tritium handling room was investigated experimentally under a US-Japan collaboration. The tritium concentration history calculated with the same method was consistent with the experimental observations, which proves that the present developed method can be applied to the actual scale of tritium handling room.

KEYWORDS: 

• tritium
• hydrogen
• fusion reactor
• safety analysis
• safety
• Caisson
• detritiation
• FLOW-3D
• Renormalization group theory model
• perfect mixing flow
• simulation
• tritium handling

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• https://doi.org/10.1080/18811248.2001.9715008

REFERENCES

(1) Los Alamos National Laboratory: Final Safety Analysis Report of Tritium Systems Test Assembly at the Los Alamos National Laboratory, TSTA-SAR, (1996).
(2) Naruse, Y., Matsuda, Y., Tanaka, K.: Fusion Eng. Des., 12, 293 (1990).
(3) Schira, P., Hutter, E., Jourdan, G., Penzhone, R.: Fu-VOL. 38, NO. 1, JANUARY 2001 sion Eng. Des., 18, 19 (1991).
(4) Bartlit, J. R., Anderson, J. L., Jalbert, R. A., Carl-son, R. V., Okuno, K., Ide, T., Fukui, H., Enoeda, M., Naruse, Y.: Proc. 13th SOFE, Knoxville, TN., U.S.A., 798 (1989).
(5) Hayashi, T., Kobayashi, K., Iwai, Y., Yamanishi, T., Nishi, M., Okuno, K., Carlson, R. V., Willms, R. S., Hyatt, D., Roybal, B.: Fusion Thecnol., 34, 521 (1998).
(6) Hayashi, T., Kobayashi, K., Iwai, Y., Yamada, M., Suzuki, T., O’hira, S., Nakamura, H., Shu, W., Yama-nishi, T., Kawamura, Y., Isobe, K., Konishi, S., Nishi, M.: Submitted to Fusion Eng. Des. (1999).
(7) Yakhot, V., Orgazag, S. A.: J. Sci. Comput., 1, 3 (1986).
(8) Hirt, C. W., Cook, J. L.: J. Comp. Phys., 10, 324 (1972).
(9) Daiguji, H., Miyake, Y., Yoshizawa, A.: “Computa-tional Fluid Dynamics of Turbulent Flow-Models and Numerical Methods”, Univ. of Tokyo Press, Tokyo, 183 (1998), [in Japanese].
(10) Hinze, J. 0.: “Turbulence”, McGraw-Hill, New York, 227 (1959).
(11) Launder, B. E., Spalding, D. B.: “Mathematical Models of Turbulence”, Academics, London, (1972).
(12) Jones, W. P., Launder, B. E.: Int. J. Heat Mass Trans-fer, 15, 301 (1972).
(13) Jones, W. P., Launder, B. E.: Int. J. Heat Mass Trans-fer, 16, 1119 (1973).
(14) Hanjalic, K., Launder, B. E.: J. Fluid Mech., 52, 609 (1972).
(15) Harlow, F. W., Nakayama, P. I.: Phys. Fluids, 10, 2303 (1967).
(16) Nakayama, P. I.: 8th Aerospace Science Meeting, AIAA paper No. 70-3, (1970).
(17) Boussinesq, J.: “Theorie Analytique de la chaleur”, Ganthier-Villars, Paris, 157 (1903).
(18) Hashimoto, K.: “Chemical Reaction Engineering”, (1st ed.), Baifuukan, Tokyo, 173 (1979), [in Japanese].
(19) Iwai, Y., Hayashi, T., Kobayashi, K., O’hira, S., Nishi, M.: Submitted to Fusion Eng. Des. (2000).