Development of experimental technology for simulated fuel-assembly heating to address core-material-relocation behavior during severe accident

Abe, Yuta; Yamashita, Takuya; Sato, Ikken; Nakagiri, Toshio; Ishimi, Akihiro

Journal of Nuclear Engineering and Radiation Science, 6(2), p.021113_1 - 021113_9, 2020/04

https://doi.org/10.1115/1.4045450

Cutting operation of simulated fuel assembly heating examination by AWJ

Abe, Yuta; Nakagiri, Toshio; Watatani, Satoshi*; Maruyama, Shinichiro*

JAEA-Technology 2017-023, 46 Pages, 2017/10

JAEA-Technology-2017-023.pdf:8.01MB

This is a report on Abrasive Water Jet (AWJ) cutting work carried out on specimen, which was used for Simulated Fuel Assembly Heating Examination by Collaborative Laboratories for Advanced Decommissioning Science (CLADS) molten core behavior analysis group in February 2016. The simulated fuel assembly is composed of Zirconia for the outer crucible/simulated fuel, stainless steel for the control blade and Zircaloy (Zr) for the cladding tube/channel box. Therefore, it is necessary to cut at once substances having a wide range of fracture toughness and hardness. Moreover, it is a large specimen with an approximate size of 300 mm. In addition, epoxy resin has high stickiness, making it more difficult to cut. Considering these effects, AWJ cutting was selected. The following two points were devised, and this specimen could be cut with AWJ. If it was not possible to cut at one time like a molten portion of boride, it was repeatedly cut. By using Abrasive Suspension Jet (ASJ) system with higher cutting ability than Abrasive Injection Jet (AIJ, conventional method) system, cutting time was shortened. As a result of this work, the cutting method in Simulated Fuel Assembly Heating Examination was established. Incidentally, in the cutting operation, when the cutting ability was lost at the tip of the AWJ, a curved cut surface, which occurs when the jet flowed away from the feeding direction, could be confirmed at the center of the test body. From the next work, to improve the cutting efficiency, we propose adding a mechanism such as turning the cutting member itself for re-cutting from the exit side of the jet and appropriate traverse speed to protect cut surface.

Development of non-transfer type plasma heating technology to address CMR behavior during severe accident with BWR design conditions

Abe, Yuta; Sato, Ikken; Nakagiri, Toshio; Ishimi, Akihiro; Nagae, Yuji

Proceedings of 2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017) (CD-ROM), 7 Pages, 2017/04

Development of plasma heating technology for simulation of LWR severe accident behavior, 1; Objectives and JFY2014 outcomes

Sato, Ikken; Abe, Yuta; Nakagiri, Toshio; Nagae, Yuji; Ishimi, Akihiro

no journal, , 

no abstracts in English

Consideration of material analysis using simulated fuel assembly heating test, 2; Study of the evaluation method by LIBS

Kawakami, Tomohiko*; Abe, Yuta; Spaziani, F.*; Nakano, Natsuko*; Nakagiri, Toshio

no journal, , 

no abstracts in English

Evaluation method using material analysis of specimen in plasma heating experiment, 2; Application possibility of materials analysis and LIBS using the plasma basics heating experiment

Kawakami, Tomohiko*; Abe, Yuta; Spaziani, F.*; Nakano, Natsuko*; Nakagiri, Toshio

no journal, , 

no abstracts in English

Establishment of evaluation method using material analysis of simulated fuel assembly heating test, 1; Outline of simulated fuel assembly heating test using non-transfer type plasma heating

Abe, Yuta; Nakagiri, Toshio; Yamashita, Takuya; Noro, Junji*; Matsushima, Tomohiro*; Kawakami, Tomohiko*

no journal, , 

no abstracts in English

元素分析方法

阿部 雄太

not registered

JP, 2018-200792  Patent licensing information

【課題】測定対象元素の特性X線に対応するピークと干渉元素の特性X線に対応するピークとが干渉する場合に、測定対象元素の組成を高精度で算出する。 【解決手段】解析部は、ZR(干渉元素)の発する特性X線のうち、Bに起因する測定対象ピークと干渉しないものに対応する波長(参照用波長)を設定し、上記の測定点におけるこの参照用波長での強度(補正用強度)も測定する。測定対象ピーク(BのKα1線)に対応する波長λ1周囲においては、測定対象ピークP11がある。この測定対象ピークP11に近接して、ZRのMZ線のピーク(干渉ピーク)P21が存在する。補正用強度測定工程においては、参照用波長λ2として、ZRのLα線のピーク(参照用ピークP41)に対応する波長が設定される。測定点におけるB組成のみを反映するI11(補正後強度)は、実測強度I31から補正用強度I41に補正係数Cを乗じた値を減じた式で表すことができる。