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ISSN : 1738-1894(Print)
ISSN : 2288-5471(Online)
ISSN : 2288-5471(Online)
고연소도 사용후 핵연료의 가열산화와 고온가열을 통한 미세조직 변화고찰
Study of morphology on the Oxidation and the Annealing of High Burn-hp UO2 Spent Fuel
Abstract
The morphology of the high burnup spent fuel, which was oxidized and annealed in a PIA (Post Irradiation Annealing) apparatus, has been observed. The high burnup fuel irradiated in Ulchin Unit 2, average rod burnup 57,000 MWd/tU, was transported to the KAERI's PIEF. The test specimen was used with about 200 mg of the spent fuel fragment of the local burnup 65,000 MWd/tU. This specimen was annealed at for 4hrs after the oxidation for 3hrs to grain boundary using the PIA apparatus in a hot-cell. In order to oxidize the grain boundary, the oxidation temperature increased up to and held for 3hrs in the mixed gas (60 ml He and 100 ml STD-air) atmosphere. The amount of 85Kr during the whole test process was measured to know the fission gas release behavior using the online system of a beta counter and a gamma counter. The detailed micro-structure was observed by a SEM to confirm the change of the fuel morphology after this test. As the annealing temperature increased, the fission products were observed to move to the grain surface and grain boundary of the matrix. This specimen was re-structured through the reduction process, and the grain sizes were distributed from 5 to .
High burn-up fuel, oxidation and annealing test, post-irradiation, fission product, micro-structure, 고연소도 핵연료, 산화 가열시험, 조사후, 핵분열생성물
Reference
JNFCWT
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Korean Radioactive
Waste Society (KRS)
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