著者
服部 禎男 青木 英人 新村 亮
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.11, no.9, pp.532-538, 1969

As nuclear power generation comes to occupy an ever larger portion of electric energy sources, it should become desirable or rather necessary for the nuclear power plants to have prompt load response characteristics to accommodate the necessary spinning reserve of the power system, even if these plants are to be operated in principle as what is known as "base load plants".<BR>The problem treated here is to find the possibility of realizing prompt load response in narrow range of BWR plants, and not wide range automatic power control.<BR>We have analyzed the load response characteristics of BWR plants by means of extraction flow variation. A decrease of the extraction flow was found to cause the plant power to increase through the following three processes:<BR>(1) Steam flow increase in the turbine<BR>(2) Reactivity increase occasioned by reactor pressure rise<BR>(3) Reactivity increase occasioned by reactor feed water temperature drop
著者
服部 禎男 湊 章男
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.36, no.10, pp.926-938, 1994

This report describes current status of the design of a 4S (Super Safe, Small and Simple Fast Reactor). The 4S is a fast reactor generating 50MWe electric power, which pursues simple operation system, less maintenance service, higher safety and improved economic features. To satisfy these special characteristics, a new plant concept is produced, where adoption of metallic fuel core and burnup control by annular reflector can ensure negative sodium void reactivity coefficient for the reactor core. The power is controled by the turbine system (water-steam system) alone without any control rod. Complicated fuel handling system and driving mechanism of control rod are eliminated. And the activity of operating service is also eliminated by the application of passive system to the reactor design. The 4S has a substantial safety and is a fast reactor in which fuel is confined for a long time of 10yr as the refueling interval, to realize high proliferation resistance of nuclear material.
著者
服部 禎男
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.37, no.4, pp.274-282, 1995

10年あまり前に提示されたT.D. Luckey博士の「放射線ホルミシス」の主張に対して,電力中央研究所は科学的真実を求めて調査と動物実験などを始めた。第1フェーズの検討によって多くの興味あるデータを得て,いま全国の大学などの専門家の協力によって,研究はその第2フェーズに入っている。本稿では,これまでの知見と分析から,低レベル放射線と人体のかかわりについて述べる。 <BR>幸運なことにDNAの分析,遺伝子の研究が急激な発展をしつつある時に,ホルミシス研究を立ち上げたためにそのメカニズムの解明が予想外の速度で進展する気配をみせている。生化学,分子生物学,免疫学,がんの機構解明など,従来の放射線基礎医学の先生方に加えて広範囲の先生にご指導を仰いで,生命のメカニズムの本質に触れるような議論も登場している。本年(1995年)秋には,米国NIHやEPAの専門家を含めた国際シンポジウムも計画され,研究の進展によって多くのデータが得られるにつれ,この研究の重要性がいよいよ拡大しつつあるように思われる。
著者
植田 公雄 藤村 亮 中野 才治 平島 浩 久保田 雄 服部 禎男 伊藤 力生 平塚 法夫
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.29, no.5, pp.428-435, 1987

A slab-type, large-scale fluidized bed reactor has been proposed as a means to obtain an adequate heat transfer area satisfying the limit of critical safe size, for use in the denitration reaction of highly enriched U. More specifically, with respect to the reactor, 120-mm wide, 1, 900-mm long, 4, 000-mm high, capable of 4% U enrichment, 3 t-U/d, examinations were conducted of its fundamental fluidization characteristics and the characteristics thus obtained showed that the reactor can be used with no ploblem and in a more stable manner than the conventional cylindrical reactor. The results are as follows:<BR>(1) It was found possible to approximate the reactor's fluidization initiation gas rate to the values obtainable by Babu's and Leva's formulas.<BR>(2) It was shown that the bed expansion can be approximated to 0.65 as calculated by Babu's formula.<BR>(3) Kato's formula can be applied, with some modifications, to the calculation of the bubble size in the fluidized bed.<BR>(4) An empirical formula was established for measuring the height of "jumping" particles, which is necessary in designing the reactor.<BR>(5) It was also found that the slab-type fluidized bed reactor operates with much less slugging and in a more stable manner than the cylindrical reactor.
著者
服部 禎男
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.8, no.12, pp.656-659, 1966

The Committee on Fission Products Release is composed of two study groups.<br>Group A deals with fission products behavior in the fuel and release thereof from the fuel.<br>Group B directs its activities toward quantitative evaluation of the physical and chemical behavior of fission products released into the single or mixed phases of water, steam and air in the nuclear power plant.<br>The article presents a brief description of some informative data from a selection of papers taken up and considered in group B.
著者
大橋 弘忠
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.40, no.6, pp.442-449, 1998
被引用文献数
1

原子力開発を含む理工学分野に現れる流れのほとんどは,複合的で複雑な性格をもっている。熱流動シミュレーションは,この複雑な熱流動に向けて新しい挑戦を始めたところである。このためには,新しい考え方とそれに基づく新しい解析方法が必要となる。本稿では,これらの複雑な熱流動を対象に行われている新しいシミュレーション手法の研究開発について現状と展望をまとめた。まず,複雑さと複雑流れの特徴を分析し,解析に当たって要求される事項と平均場モデルの特徴を整理した。次に,複雑熱流動解析の主な動向として,界面を含む流れの解析手法とミクロ機構に基づくモデルを取り上げ,それぞれについて基礎となる考え方と現状,課題をまとめた。
著者
秋山 守 大橋 弘忠 太組 健児 篠原 慶邦 広瀬 正史 伴 博之 粕谷 俊郎
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.36, no.2, pp.103-111, 1994

The super-simulator is a conceptual name for future innovative simulators of nuclear power plants which surpass, to a large extent, the capabilities and performances of existing nuclear power plant simulators for operator training, plant analyzers for engineering studies or computer codes for dynamics analysis. Such super-simulators will be realized by employing highly advanced methods of mathematical modeling of the physical chemical and other related processes in the nuclear power plants and innovative methods of numerical computation using rapidly evolving high performance computing systems.
著者
秋野 金次 加藤 宗明 田村 誠也
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.13, no.2, pp.85-90, 1971-02-28 (Released:2009-04-21)

In the previous Part (I), we described the circumstances leading to the establishment of the aseismic design principle, the determination of the earthquake for purposes of design, and the outline of seismic design specification.In Part (II) and (III), we present a summary of the seismic calculations covering the main components in an endeavor to demonstrate how the principles described in Part (I) are actually embodied in the plant. We take up here the reactor building, containment and pressure vessel which are classified as A, As and A respectively according to the definition in Part (I).Following this, we will report in Part (III) on the design of the reactor internals, equipment and piping.
著者
工藤 和彦 加治 芳行 熊谷 明 柴田 俊一 渡邊 鐶 村上 昌俊 熊谷 明 仁科 浩二郎
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.37, no.5, pp.375-397, 1995

次世代を担う若者たちが原子力について何を学び,どのようなことを感じているか,ということを的確に知ることは,原子力に関連する幅広い分野をカバーする当学会にとって重要であると考える。しかし,このような視点から若年層に接していくという姿勢や試みは,これまで十分であったとはいえないように思われる。最近しばしば指摘される「原子力離れ」という現象も,その根はずっと以前,つまり現在の成人が未成年であった頃にあるとも考えられる。 <BR>このような問題意識から,本「特集」では,若年層および教育関係者への様々な原子力広報活動の現状と今後の計画を明らかにし,それによって原子力関連の方々の今後の諸活動に生かしていくことを意図している。
著者
秋野 金次 柴田 碧
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.8, no.11, pp.614-616, 1966-11-30 (Released:2009-03-31)
参考文献数
2

Recent developments in earthquake resistant designs for nuclear power plants in Japan are reviewed to cover the period since the authors' previous report on the same subject. The first part is devoted to a comparison of the design concepts and procedures between those of the plants constructed, under construction and being designed in Japan. The second part of the review covers the progress made in studies in this field, and the moves seen in Government quarters to utilize the results of these studies in setting the regulations pertaining to nuclear safety.
著者
林 昇一郎
出版者
一般社団法人 日本原子力学会
雑誌
日本原子力学会誌 (ISSN:00047120)
巻号頁・発行日
vol.10, no.8, pp.444-448, 1968-08-30 (Released:2010-04-19)
参考文献数
9

A weak radioactive anomaly (0.080mR/hr) was detected at Yuya in 1959, but since then no furthur efforts in prospection have been undertaken in the area, since at that time it was not customary to attach much value to such occurrences. In November, 1966, significant radioactivity (1.7mR/hr, 0.6% U3O8) was detected 35m south of the previous location, in the course of a systemafic car-borne radiometric survey undertaken by the Atomic Fuel Corporation of Japan. To date, several uranium occurrences have been discovered in formations belonging to the Cretaceous Period. This is the first instance of such occurrence in Cretaceous formation discovered in Japan.The Yuya uranium deposits occur mainly in dark gray to brown, hard compact sandstone and/or sandy shale. The deposits appear related to rhyolitic rock intrusions. A secondary uranium mineral, believed to be autunite, is sporadically found in the black silicified sandstone closely associated with pyrite and chlorite. Little uranium would appear to be contained in such clay minerals as chlorite according to radioluxograph and X-ray fluorescent examination, since primary uranium minerals have not yet identified.So far prospection for uranium deposits in Japan have been directed mostly to the Neogene Tertiary just above the granitic host rocks. The discovery of the Yuya deposits in Cretaceous formation is highly significant in that it has opened up a vast new area to prospection in strata other than Tertiary formation, and this urges us to continue our efforts in gathering further information that should contribute to a better assessment of the domestic uranium potentiality.