EN ISO 15646:2016 PDF
Re-sintering test for UO2, (U,Gd)O2 and (U,Pu)O2 pellets (ISO 15646:2014)
Re-sintering test for UO2, (U,Gd)O2 and (U,Pu)O2 pellets (ISO 15646:2014)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 13
- Дата публикации:
- 20 апреля 2016 г.
- Издание:
- CEN EN 15646 edition 1 version 1
- ICS:
- 27.120.30
ISO 15646:2014 describes a procedure for measuring the densification of UO2, (U,Gd)O2, and (U,Pu)O2 pellets, achieved by heat treatment under defined conditions. The densification of fuel in power operation is an important design feature. Essentially, it is dependent on structural parameters such as pore size, spatial pore distribution, grain size, and in the case of (U,Gd)O2 and (U,Pu)O2, oxide phase structure. A thermal re-sintering test can be used to characterize the dimensional behaviour of the pellets under high temperature. The results of this test are used by the fuel designer to predict dimensional behaviour in the reactor, because thermal densification in the reactor is also dependent on these structural parameters, albeit in a differing manner in terms of quantity.
Abstract
Overview
EN ISO 15646:2016 (identical to ISO 15646:2014) specifies a standardized re-sintering test for nuclear fuel pellets - UO2, (U,Gd)O2 and (U,Pu)O2 - to measure thermal densification produced by controlled heat treatment. The procedure quantifies the change in pellet density after exposure to defined furnace conditions and confirms that the oxygen/metal (O/M) ratio remains essentially constant (tolerance ±0.005). Results support fuel design and quality control by characterizing dimensional behaviour of pellets under high temperature.
Key topics and technical requirements
- Scope: Measurement of pellet densification caused by re-sintering (heat treatment) under specified temperature, time and atmosphere.
- Density measurement methods:
- Geometric method (diameter & height measured with 1 µm precision dial indicator or micrometer; mass with analytical balance readable to 1 mg).
- Buoyancy method (per ISO 3369) - recommended for chipped pellets or those with open pores.
- Heat treatment parameters:
- Heating and cooling rates
Технические детали
- Технический комитет
- CEN/TC 430 - Nuclear energy, nuclear technologies, and radiological protection
- SKU
- EN ISO 15646:2016
Похожие стандарты
Упомянутые в описании и другие стандарты EN