PNC型Na中水素検出計2号機 -動的室・静的室分離型-(小リーク・ナトリウム・水反応試験研究 第15報)

PNC In-sodium hydrogen meter type-II (Separation type of dynamic and static chambers); Studies of small leak sodium water reactions (15)

鐘ヶ江 直道*; 池本 一郎*; 大後 美道; 井上 設生*; 堀 雅夫*

Kanegae, Naomichi*; not registered; Daigo, Yoshimichi; not registered; not registered

PNC型Na中水素検出計2号機は,すでに報告した同1号機の試作,試験から得られた成果を基に,商速増殖原型炉「もんじゅ」での使用を想定し設計,製作されたものであり,現在動力炉・核燃料開発事業団大洗工学センタ内各種試験装置に組込まれ順調に稼動が続けられている。この2号機の特徴は,検出計の較正運転手法の簡易化および精度の向上を目的として従来はなかった「動的室,静的室分離型」の構成を開発し実用化した点にある。▲本書は,この2号機の法本設計仕様,詳細構造および較正試験,水注入時の応答試験を含むNa巾試験結果について記述するものである。これ等の設計,試作および試験を通じて以下の成果を得た。▲1)「動的室,静的室分離型」は較正試験時の運転手法の簡易化および較正精度の向上に有効である。▲2)同1号機の経験も含め,既に報告した「検出計最適設計法」の妥当性を確認した。▲3)「もんじゅ」の適用可能な設計,製作および運転に関する多くの情報を得ると同時に,本2号機が「もんじゅ」用として使用可能である事の見通しを得た。▲大洗工学センタでは現在この2号機を使用して,検出計の寿命,経年変化を把握するための長期試験を行って更に多くの運転経験を積み重ねる予定である。▲

Seven PNC Type In-Sodium Hydrogen Meter Type-II were designed and manufactured to confirm that these meters will be applicable to the "MONJU" plant, and they have been installed and operated without any troubles in several testrigs of O-arai Engineering Center, Power Reactor & Nuclear Fuel Development Corporation. These meters were improved from the Type-I reported previously, and a new vacuum system named as "Separation Type of Dynamic and Static Chamber" was developed and applied to the Type-II. In this new system, the dynamic and the static chamber are separated from each other in the vacuum system, so that the operation method become very simpler and it becomes possible to calibrate these meters with more accurately and shorter time. This paper explains the basic design specifications, the detail constructions and the test results of in-sodium tests including the calibration and the response characteristics in case of sodium-water reactions were occured. The following results were obtained. (1)The separation type of dynamic and static chamber is effective to simplify the operation method and to improve the accuracy of calibration of hydrogen meter. (2)The optimum design method of hydrogen meter reported preveously was established by several experiences of designing, manufacturing and operating of the Type-II and also the Type-I. (3)Several infomations applicable to the hydrogen meter of the MONJU plant were obtained, and a prospect that this Type-II hydrogen meter will be able to be used in MONJU plant was obtained. Now, long term operation test in sodium is under conducting for confirming life time or characteristics of operation time dependency of the Type-II meters in O-arai Engineering Center.