報告書番号

285059

タイトル（和文）

鋳鉄製キャストール型モデルキャスクコア材の諸特性

タイトル（英文）

CORE MATERIAL CHARACTERISTICS OF GNS MODEL CASK MANUFACTURED BY DUCTILE CAST IRON

概要 （図表や脚注は「報告書全文」に掲載しております）

本報告は当所で実施した遮蔽試験溶モデルキャスクのコア材の諸特性を調べたものである。（１）欠陥の非破壊検査；液体浸透および放射線試験結果，外表面に黒鉛脱落によるインディケーションがみられたが，内部の引け巣および割れ等の有害欠陥は認められない。（２）機械的性質；ａ室温（１７℃）に於ける引張特性はＪＩＳＧ５５０２／ＦＣ３７（ＤＩＮＧＧＧ４０，３／７０ｍｍ厚）に相当する材料であった。ｂシャルピ衝撃値は－４０℃でも１．３ｋｇ・ｍを示し，ＪＩＳＦＣＤ３７の室温最小値１．１ｋｇ・ｍをクリアしていた。Ｃ－２０℃以下の低温では，動的機械靱性値に比べて低下する。ｄ比熱，熱伝導率および線膨張係数等の物理的特性についてはこれ迄に報告されている球状黒鉛鋳鉄の物性値にほゞ一致する。ｅ黒鉛球状化率は８５～９０％，平均黒鉛粒形は５０～６０μｍ，フェライト面積率は９０％以上であった。

概要 （英文）

WITH THE INCREASE IN THE STOCK OF SPENT FUEL, THE DRY TYPE INTERMEDIATE STORAGE USING CASKS IS UNDER CONSIDERATION FOR POSSIBLE FUTURE APPLICATION.THE CONVENTIONAL SPENT FUEL TRANSPORT CASKS ARE FORGINGS. FABRICATION OF TRANSPORT-STORAGE CASKS WITH CAST IRON WILL RESULT IN A REDUCTION IN COST. HOWEVER,STANDARDS APPLICABLE TO DUCTILE CAST IRON CASKS OF WHICH THE WALL IS AS THICK AS 400 MM HAVE NOTBEEN ESTABLISHED YET. THE PRESENT REPORT COMPILES THE RESULTS OF THE COMPREHENSIVE INVESTIGATION ON CORE MATERIALS OF THE GNS S DUCTILE CAST IRON MODEL CASK WHICH WERE USED IN THE SHIELDING TEST CONDUCTED BY CRIEPI IN FISCAL 1985. MAJOR RESULTS ARE AS FOLLOWS. (1)NONDESTRUCTIVE EXAMINATION AS A RESULT OF LIQUID PENETRATION TEST AND RADIOGRAPHIC TEST, PRESENCE OF HARMFUL DEFECTS SUCH AS CAVITIES, CRACKS, ETC. HAVE NOT BEENPERCEIVED. (2)MEASUREMENT OF BASIC PHYSICAL PROPERTIES. THE RESULT OF MEASUREMENT OF VARIOUS FUNDAMENTAL PHYSICAL VALUES SUCH AS SPECIFIC HEAT, THERMAL CONDUCTIVITY, AND COEFFICIENT OF LINEAR EXPANSION INCLUSIVE OF THEIR THERMAL DEPENDENCE IMPLIES THAT THESE VALUES ROUGHLY COINCIDE WITH THE PHYSICAL VALUES OF NODULAR CAST IRON REPORTED IN THE PAST. (3)INVESTIGATION INTO MECHANICAL PROPERTIES. REGARDING OVERALL MECHANICAL PROPERTIES, NO EXTREME DIFFERENCE HAS BEEN PERCEIVED IN VALUES IN THE AXIAL DIRECTION (TOP END, CENTER PART, AND BOTTOM END). THE TENSILE CHARACTERISTICS HAVE EXHIBITED VALUES ALMOST IDENTICAL WITH THOSE STIPULATED BY JIS FCD37. AS A RESULT OF CHARPY IMPACT TEST AND DYNAMIC FRACTURE TOUGHNESS TEST (INSTRUMENTED CHARPY AND RCT (JID)), THE BEHAVIOR OF TRANSITION HAS BEEN OBSERVED AT ROOM TEMPERATURE AND BELOW IN ALL CASES. ACCORDING TO THE RESULTS OF THE DYNAMIC FRACTURE TOUGHNESS TEST, THE VALUES OF FRACTURE TOUGHNESS BY ISTRUMENTED CHARPY AND RCT (JID) HAVE BEENSHOWN TO BE APPROXIMATELY IDENTICAL. ALL DATA OBTAINED AS A RESULT OF A SERIES OF INVESTIGATIONS REPORTED IN THIS PAPER ARE CONSIDERED TO BE USEFUL A

報告者

キーワード