長尺ナトリウム液位計ナトリウム中試験

In-sodium test of long length level-meter

久門 靖尚*; 荒木 等*; 中本 香一郎*; 山本 研*

not registered; not registered; not registered; not registered

原型炉「もんじゅ」の原子炉容器には,ナトリウム液位監視用として有効測定長約5mの誘導型液位計の設置が計画されている。しかし従来の液位計は高々2m長までの短い液位計であったため新たに実機寸法と同じ長尺液位計を製作し,その仕様を満足するかどうかを確認するためのナトリウム中試験を行った。その結果ナトリウム温度200600において,実機要求精度4%を満足することが確認され,実機液位計設計製作の見通しが得られた。なお,更に精度向上を計り得る液位計の設計改善法や,実機設置上の留意点などについての提言を合わせて行った。

It is planed that induction type level-meter of effective measurement length about 5m is installed for monitoring of sodium level in reactor vessel of "MONJU" Plant. Length of level-meters made so far were less than 2m. So long length level-meter which had same length for real plant was fabricated, and in-sodium tests for confirmation of performance as "MONJU" plant instrument were conducted. From these tests, it was found that "MONJU" plant require ment on measurement accuracy (4%) was satisfied, and prospect of design and fabrication for real plant was obtained. And some propositions were given which were about improvement design of the level-meter property and caution at the installation into the reactor vessel.