ML24274A323
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| ML24274A323 | |
| Person / Time | |
|---|---|
| Issue date: | 10/04/2024 |
| From: | Kojima M Office of Nuclear Regulatory Research, Organization for Economic Co-operation and Development (OECD), Nuclear Energy Agency |
| To: | |
| M. Bayssie | |
| Shared Package | |
| ML24274A318 | List: |
| References | |
| Download: ML24274A323 (33) | |
Text
20Structure Member Stage of Progression Delayed-Expansion Reactive Minerals Intake Structure Atmospheric Zone ii: No reactiveCryptocristalline quartz Microcristalline quartz Reaction RimRhyoliteCement paste Cryptocrystalline quartz and FeldsparPlagioclase Single nicole Orthogonal nicole In some parts of the "intake structure", delayed d ilatant reactive minerals (cryptocrystalline quartz and microcrystalline quartz) were observed in the -part of the marine sand, the rhyolite.
As a result of the accelerated expansion test (*1), the possibility of delayed expansion was judged to be low. Other than rhyolite, no retarded expansion reactive mine rals were observed.
- 1: The accelerated concrete core expansion test in 1N NaOH solution at 80 degrees for 4 weeks was conducted in 2022. Compared to the judgment criteria (*2) (expansion rate of less than 0.1% in 21 days), the expansion rate was about 0.069% after 28 days of immersion.
- 2Katayama et al: Alkali-aggregate reaction under the influe nce of deicing salts in the Hokriku district, Japan (2004)Results of the polarizing microscope in Sendai Unit-1 [5]