高速増殖大型炉の設計主要目に関する研究(II); 燃料取扱系の検討(II)

Study on the main design parameters of large scale-up fast breeder reactor (II); Study on fuel handling system (II)

竹内 則彦*; 田村 政昭*; 中西 征二; 谷山 洋*; 尾崎 栄進*

not registered; not registered; Nakanishi, Seiji; not registered; not registered

高速増殖大型炉の燃料取扱系の合理化を図るため、昭和61年においてEVS方式(Ex-Vessel Storage:炉外貯蔵方式)の燃料取扱系について設備設計を実施した。EVS方式は設備物量の観点からもIVS方式(In-Vessle Storage:炉内貯蔵方式)に競合出来る概念であり、(1)炉容器径の縮少化、(2)ナトリウム系から水系への燃料移送プロセスの削除、及び(3)炉外NIS(核計装)の実現化、等が期待できる。そこで、本年度はEVS方式としてナトリウムポットEVS貯蔵方式燃料取扱系を対象に、定常時及び異常時の温度挙動解析を行い、昭和61年度の設計評価の妥当性を確認するとともに、設備の要求条件を検討した。その結果、前年度設計の妥当性を改めて確認し、必要な要求事項を摘出した。

In order to rationalize the fuel handling system of Large Scale-up Fast Breeder Reactor, the equipment design of the Ex-vessel Storage (EVS) type fuel handling system was conducted in 1986. It can be considered that EVS type is coordinate with in-Vessel Storage (IVS) type from a viewpoint of materials and advantageous to Large Scale-up Fast Breeder Reactor for (1) reduction of reactor vessel diameter, (2) removal of the fuel handling process from sodium environment to water, and (3) realizationof ex-vessel NIS. As concerns sodium pot EVS type, the heat removal analysis at normal and transient conditions was performed to confirm the adequacy of the results gained from the equipment design in 1986 and to investigate requirements for the system. It was confirmed from the analysis results that the design was adequate and the requirements were extracted.