Development of Water Level Gage Drift Recovery System by using Back Fill System during Severe Accident
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- NARABAYASHI Tadashi
- Hokkaido University
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- KURA Yuki
- Hokkaido University
Bibliographic Information
- Other Title
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- 原子炉水位計指示誤差解消システムの開発
Abstract
In Fukushima accident on 2011, molten core supposed to be leaked on the concreate floor in containment vessel. After the loss of both the emergency core cooling system and IC core cooling, primary containment vessel (PCV) pressure increased. Water level measurement drifted because of water evaporation in the reference leg. Radiation level increased at a turbine building (T/B). There was a hydrogen explosion the after suppression chamber (S/C) wet venting. Modular Accident Analysis Program (MAAP) code analysis results and actual data suggest that depressurization of the reactor pressure vessel (RPV) began before its bottom failed. The data shows that the measured water level measurement drifted by more than 4 m owing to water loss in the reference leg. This is likely to have been caused by the high-temperature superheated core. Water should have been supplied to the water level reference leg through instrumentation piping. The system is named the back fill system. The system test was conducted and succeeded the recovery of water level gage.
Journal
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- The Proceedings of the National Symposium on Power and Energy Systems
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The Proceedings of the National Symposium on Power and Energy Systems 2018.23 (0), A133-, 2018
The Japan Society of Mechanical Engineers
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Keywords
Details 詳細情報について
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- CRID
- 1390001288101869312
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- NII Article ID
- 130007550720
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- ISSN
- 24242950
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed