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Journal Articles

Project management efforts in the decommissioning project of Tokai Reprocessing Plant

Taguchi, Shigeo; Taguchi, Katsuya; Makino, Risa; Yamanaka, Atsushi; Suzuki, Kazuyuki; Takano, Masato; Koshino, Katsuhiko; Ishida, Michihiko; Nakano, Takafumi; Yamaguchi, Toshiya

Nihon Hozen Gakkai Dai-17-Kai Gakujutsu Koenkai Yoshishu, p.499 - 502, 2021/07

In 2018, Tokai Reprocessing Plan (TRP) shifted to the decommissioning stage. In order to proceed with steady decommissioning work, TRP effort to enhance project management function. This paper describes the establishment and role of the Decommissioning Project Management Office, effectiveness of applying the project management tool and its utilization concept, and the method of materialize the equipment dismantling plan.

JAEA Reports

The Second periodic safety review report of Tokai Reprocessing Plant

Shirai, Nobutoshi; Miura, Yasushi; Tachibana, Ikuya; Omori, Satoru; Wake, Junichi; Fukuda, Kazuhito; Nakano, Takafumi; Nagasato, Yoshihiko

JAEA-Technology 2016-007, 951 Pages, 2016/07

JAEA-Technology-2016-007-01.pdf:11.93MB
JAEA-Technology-2016-007-02.pdf:4.7MB

The periodic safety review of TRP is to confirm the safety activities and get effective additional measures the facility safety and its reliability. We implemented 4 items; for (1) evaluation of safety activity implementation, we confirmed we are adequately expanding its safety activities by the necessary documents and schemes. For (2) evaluation of status of safety activities reflecting the latest technical knowledges, we confirmed we reflect latest knowledges for improvement of safety and reliability. For (3) technical evaluation about aging degradation, we can keep the safety of the facilities important to safety and the sea discharge line, under assumption of the present maintenance, because of "focuses for aging degradation". For (4) planning measures about a 10-years-plan that the operator shall implement to keep the facility condition, by the technical evaluation, we found no additional safety plans into maintenance strategies.

Journal Articles

Integrity check of Tokai Reprocessing Plant after the Tohoku Region Pacific Coast Earthquake

Nakano, Takafumi; Sato, Fuminori; Shirozu, Hidetomo; Nakanishi, Ryuji; Fukuda, Kazuhito; Tachibana, Ikuya

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 57(1), p.14 - 20, 2015/01

no abstracts in English

JAEA Reports

The Periodic safety review report of Tokai Reprocessing Plant

Fukuda, Kazuhito; Tomioka, Kenichiro*; Omori, Satoru; Nakano, Takafumi; Nagasato, Yoshihiko

JAEA-Technology 2014-032, 566 Pages, 2014/11

JAEA-Technology-2014-032.pdf:32.45MB
JAEA-Technology-2014-032(errata).pdf:9.54MB

The Periodic Safety Review of TRP is assessment of the validity of safety activities in order to get assurance for continuous operation by adding effective items to extract and to execute for TRP safety. We performed 4 items; for (1) evaluation of safety activity at TRP, as we confirmed organization was ordered and managed. For (2) evaluation of status of safety activities reflecting the latest knowledge, we confirmed improvement of safety was continued adequately reflecting from the experience for safety. For (3) technical review on aging for the safety related structures, systems and components, we evaluated the guaranty of safety under assumption of continuous maintenance till the next Periodic Safety Review. For (4) establishment of long term maintenance program, we found no additional activities into maintenance programs, however, for several installations we established a plan and utilized them for reliability.

Journal Articles

Identified charged hadron production in $$p + p$$ collisions at $$sqrt{s}$$ = 200 and 62.4 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06

 Times Cited Count:176 Percentile:99.41(Physics, Nuclear)

Transverse momentum distributions and yields for $$pi^{pm}, K^{pm}, p$$, and $$bar{p}$$ in $$p + p$$ collisions at $$sqrt{s}$$ = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different $$sqrt{s}$$ collisions. We also present the scaling properties such as $$m_T$$ and $$x_T$$ scaling and discuss the mechanism of the particle production in $$p + p$$ collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.

Journal Articles

Azimuthal correlations of electrons from heavy-flavor decay with hadrons in $$p+p$$ and Au+Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.

Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04

 Times Cited Count:7 Percentile:49.81(Physics, Nuclear)

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled $$p+p$$ collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to $$p+p$$ collisions.

JAEA Reports

PSA Application on the Tokai Reprocessing Plant

Takafumi, Nakano,; Ishida, Michihiko; Kazuyuki, Morimoto,; Inano, Masatoshi; Nojiri, Ichiro

JNC TN8410 2003-017, 190 Pages, 2004/03

JNC-TN8410-2003-017.pdf:6.61MB

Probabilistic Safety Assessment (PSA) methodology has been applied to evaluate the relative importance of safety functions that prevent the progress of event causing to postulate accidents.

JAEA Reports

Report of Examination of the Sample from Core Shroud (2F2-H3) at Fukushima Dai-ni Power Station Unit-2 (Contract research)

The Working Team for Examination of the Sample from Core Shrouds and Primary Loop Recirculation Pipi; Nakajima, Hajime*; Shibata, Katsuyuki; Tsukada, Takashi; Suzuki, Masahide; Kiuchi, Kiyoshi; Kaji, Yoshiyuki; Kikuchi, Masahiko; Ueno, Fumiyoshi; Nakano, Junichi; et al.

JAERI-Tech 2004-015, 114 Pages, 2004/03

JAERI-Tech-2004-015.pdf:38.06MB

The Tokyo Electric Power Company (TEPCO) visually inspected the weld joint of core shroud at Fukushima Dai-ni Nuclear Power Station Unit-2 by a direction of the Nuclear and Industrial Agency, cracks were observed at outer side of the ring weld joint (H3) between a core shroud middle trunk and a middle ring. TEPCO has conducted a material examination with Nippon Nuclear Fuel Development Co. Ltd. (NFD) on the specimen including cracks sampled from the core shroud. The present examination has been performed with the objective to independently investigate and evaluate the materials by jointly attending the examination with NFD from the planning stage. Based on results of the present examination, the probable presence of tensile residual stress by welding process and dissolved oxygen contents in the cooling water, it was shown that the cracks were considered to be stress corrosion cracking (SCC). However, the cause of the cracks needs more consideration on the way of shroud construction.

Oral presentation

Ageing management for safe long term operation of Tokai Reprocessing Plant

Nakano, Takafumi

no journal, , 

no abstracts in English

Oral presentation

Ageing management of Tokai Reprocessing Plant

Nakano, Takafumi; Inano, Masatoshi; Aoshima, Atsushi

no journal, , 

no abstracts in English

Oral presentation

Corrosion issues for the mid-and-long term safety management of Fukushima Daiichi NPP

Tsukada, Takashi; Motooka, Takafumi; Nakano, Junichi; Sato, Tomonori; Hata, Kuniki; Yamamoto, Masahiro

no journal, , 

At the Fukushima Daiichi (1F) nuclear power plant (NPP), the seawater was injected to cool down the reactor cores and fuel assemblies in Spent Fuel Pool (SFP) after the accident in March 2013. Therefore, steel components of Primary Containment Vessel (PCV) and Reactor Pressure Vessel (RPV) and also Zircaloy cladding of fuel assemblies in SFP will be exposed to corrosion environment of diluted seawater and high dose radiation during storage. At JAEA, based on the mid-and-long-term roadmap for decommissioning of the unit 1-4 of 1F NPP, research on the long term integrity of RPV/PCV and fuel assemblies have been carried out from a viewpoint of the effect of seawater and radiation on corrosion. Outline and results of irradiation corrosion test will be presented.

Oral presentation

Integrity check of Tokai Reprocessing Plant after the Tohoku Region Pacific Coast Earthquake, 3; Detailed checkup and comprehensive evaluation of installations in TRP

Fukuda, Kazuhito; Tomioka, Kenichiro*; Tachibana, Ikuya; Shirai, Nobutoshi; Kosaka, Ichiro; Nakano, Takafumi; Nagasato, Yoshihiko

no journal, , 

no abstracts in English

Oral presentation

Integrity check of Tokai Reprocessing Plant after the Tohoku Region Pacific Coast Earthquake, 1; Background and outline

Nakano, Takafumi; Fukuda, Kazuhito; Sato, Fuminori; Kosaka, Ichiro; Nagasato, Yoshihiko

no journal, , 

no abstracts in English

Oral presentation

Integrity check of Tokai Reprocessing Plant after the Tohoku Region Pacific Coast Earthquake, 5; Detailed checkup and comprehensive evaluation of buildings in TRP

Sato, Fuminori; Nakanishi, Ryuji; Kosaka, Ichiro; Nakano, Takafumi; Nagasato, Yoshihiko

no journal, , 

no abstracts in English

Oral presentation

Integrity check of Tokai Reprocessing Plant after the Tohoku Region Pacific Coast Earthquake, 2; Earthquake response analysis of installations in TRP

Koshino, Katsuhiko; Shirai, Nobutoshi; Sakaguchi, Shinobu; Shirozu, Hidetomo; Otaki, Miyuki*; Kosaka, Ichiro; Nakano, Takafumi; Nagasato, Yoshihiko; Tachibana, Ikuya

no journal, , 

no abstracts in English

Oral presentation

Integrity check of Tokai Reprocessing Plant after the Tohoku Region Pacific Coast Earthquake, 4; Earthquake response analysis of buildings in TRP

Nakanishi, Ryuji; Sato, Fuminori; Kosaka, Ichiro; Nakano, Takafumi; Nagasato, Yoshihiko

no journal, , 

no abstracts in English

Oral presentation

Effect of $$gamma$$-ray irradiation on inhibition of steel corrosion in diluted sea water

Sato, Tomonori; Kato, Chiaki; Motooka, Takafumi; Ueno, Fumiyoshi; Nakano, Junichi; Kaneko, Tetsuji*; Tanaka, Norihiko*; Kawaharada, Yoshiyuki*; Fujii, Kazumi*; Iwanami, Masaru*; et al.

no journal, , 

no abstracts in English

Oral presentation

Decommissioning of Tokai Reprocessing Plant (TRP), 4; Specific activities for risk reduction for TRP decommissioning

Nakazawa, Yutaka; Murakami, Manabu; Taguchi, Katsuya; Nakano, Takafumi; Nagasato, Yoshihiko

no journal, , 

JAEA will make a TRP safety policy necessary to adequate the new standard of legal regulation for nuclear facilities and to improve the action based on the decommissioning phase of TRP that counting the nuclear material and importance to control it. I will explain the present TRP situation, selection of important facilities in viewpoint of safety and credible accidents, and the safety policy now planning.

Oral presentation

Characteristics and mitigation method for corrosion of equipment materials under gamma-ray irradiated condition

Yamamoto, Masahiro; Motooka, Takafumi*; Nakano, Junichi*; Kato, Chiaki; Sato, Tomonori

no journal, , 

About 10 years have passed after Higashi-Nihon earthquake. Decommissioning process of Fukushima Dai-ichi NPS have been continuing day by day. However, some corrosion problems were revealed at the early stage after the accident, because sea water was used for emergency cooling of reactor vessel. In this report, research and development against those corrosion problems by JAEA researchers are introduced briefly. For example, corrosion mechanism and mitigation procedure for spent nuclear fuel pool, reactor vessel and equipment for removal of radioactive materials are summarized.

Oral presentation

Issues and outlooks on maintenance and ageing management of the Tokai Reprocessing Plant during the early decommissioning phase

Taguchi, Katsuya; Nakabayashi, Hiroki; Nakano, Takafumi

no journal, , 

The Tokai Reprocessing Plant (TRP) was taken out of service of spent fuel reprocessing operation and the first decommissioning plan was authorized by the Nuclear Regulatory Agency (NRA) at June 2018. Due to the complexity, numerousness of facilities and various condition of contamination, it would be expected the decommissioning plan requires over 70 years. In the view of maintenance following three major issues were arisen at this time, temporary increase of maintenance and testing works with additional equipment for safety enhancement to the storage of HAW, the ageing management for over 70 years decommissioning period and optimizing the replacement strategy for existing equipment considering of the risk level reduction with progress of the decommissioning plan. The presentation shows our perspective and conceptual procedures to take up these issues.

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