Development of Irradiation Capsules in Liquid Metal Environment in Joyo and Their Application to Irradiation Creep Measurement of Vanadium Alloys

Fukumoto, Ken-ichi; Narui, Minoru; Matsui, Hideki; Ito, Kazuhiro; Yano, Yasuhide

doi:10.3327/jnst.45.171

Cited by 4 publications

(12 citation statements)

References 10 publications

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“…No significant difference for irradiation creep behavior between liquid-sodium and liquid-lithium environments could be seen. Troyanov-150MPa (3.2dpa) [12] Joyo-150MPa (1.7dpa & 5dpa) [2] HFIR-150MPa (2.6dpa) HFIR-150MPa (5.8dpa) [13] 10 …”

Section: Discussionmentioning

confidence: 99%

“…Fig. 1 shows plots of the effective irradiation creep strain as a function of applied stress for highly purified V-4Cr-4Ti alloys irradiated in Joyo in a sodium environment [2]. It is apparent that the irradiation creep strain of the annealed alloys increases in proportion to the applied stress.…”

Section: Methodsmentioning

confidence: 98%

“…Detailed information about the experimental procedure for Joyo irradiation is given in ref. [2]. The MNTR-01 and -02 irradiations in Joyo were conducted at reflector positions (6th raw position) for material irradiation examination in the MK-III core configuration of the Joyo reactor.…”

Section: Methodsmentioning

confidence: 99%

“…After removing the sodium remnant on the PCTs and cleaning their surface [2], their dimensional changes were measured with a KEYENCE LM-7030MT precision laser profilometer to an accuracy of 1 lm for the outer-diameter measurement.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, little is known about the mechanical properties of vanadium alloys during neutron irradiation at high temperatures. Recently, material irradiation technology in liquid-metal environments has been developed and irradiation creep experiments on vanadium alloys in nuclear piles have been carried out [2,3]. Environmental and irradiation effects on creep deformation in irradiation creep experiments under neutron irradiation should be distinguished independently in order to understand the essential irradiation creep process in a nuclear pile.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Environmental effects on irradiation creep behavior of highly purified V–4Cr–4Ti alloys (NIFS-Heats) irradiated by neutrons

Fukumoto

Narui

Matsui

et al. 2009

Journal of Nuclear Materials

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a r t i c l e i n f o a b s t r a c tIn order to investigate the effect of the environment on the irradiation creep properties of highly purified V-4Cr-4Ti alloys, neutron irradiation experiments with sodium-enclosed irradiation capsules in Joyo and lithium-enclosed irradiation capsules in HFIR-17J were carried out using pressurized creep tubes (PCTs). It was found that the creep strain rate exhibited a linear relationship with the effective stress up to 150 MPa at 458 and 598°C in the Joyo irradiation experiments. For HFIR-17J irradiation at 425°C, the creep strain rate also exhibited a linear relationship with the effective stress up to 150 MPa. The activation energy of the irradiation creep and irradiation creep stress factor were estimated to be 46 kJ/mol K and 1-2, respectively. No significant difference in the irradiation creep behavior between liquid-sodium and liquid-lithium environments could be seen.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Environmental effects on irradiation creep behavior of highly purified V–4Cr–4Ti alloys (NIFS-Heats) irradiated by neutrons

Fukumoto

Narui

Matsui

et al. 2009

Journal of Nuclear Materials

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Mechanical properties of neutron-irradiated vanadium alloys in a liquid-sodium environment

Kuroiwa

Fukumoto

Narui

et al. 2009

Journal of Nuclear Materials

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Vanadium alloys, including the highly purified V-4Cr-4Ti alloy called NIFS-Heat2, in the form of sodium-enclosed irradiation capsules, were irradiated up to a damage level of 5dpa in the Joyo reactor at temperatures from 395 to 601°C. An increase of the ductile–brittle transition temperature (DBTT) by neutron irradiation and irradiation hardening were observed. No significant loss of ductility was observed even for irradiation at 395 and 450°C. The addition of titanium to V-Cr alloys was effective for irradiation hardening at high temperature. Hydrogen uptake in the cleaning process during dismantling of the irradiation capsules caused ductility loss of the highly purified V-4Cr-4Ti alloys; the alloys recovered their ductility when they were annealed at 400°C in vacuum. The uniform formation of Ti(OCN) precipitate was suppressed in highly purified V-4Cr-4Ti alloys irradiated in Joyo in a liquid-sodium environment

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Study on the Effects of Liquid Thermal Media on the Irradiation Capsule of High-Temperature Materials

Cho

Kim

Yang

et al. 2015

Science and Technology of Nuclear Installations

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Irradiation tests of materials at HANARO have usually been conducted using a standard capsule at temperatures of about 300 ∘ C for irradiation of materials used at PWR. Thus, the standard capsule uses aluminum as the specimen holder, which acts to dissipate the thermal energy. Future nuclear systems such as a VHTR and SFR require the irradiation tests at a relatively high temperature. As an alternative to aluminum which has been used as the thermal media in a standard material capsule, the characteristics of liquid metals such as NaK and LBE are reviewed. The temperatures of the capsule are affected by the variation of parameters such as the gap and wall thickness of the container. In particular, the external gap is most important in determining the temperature of the specimen. LBE raises the temperature of the specimen higher than NaK at the same configuration of the capsule. Thus, LBE can lessen the gap of the parts and reduce the vibration for a stable long-term test in reactor.

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Development of Irradiation Capsules in Liquid Metal Environment in Joyo and Their Application to Irradiation Creep Measurement of Vanadium Alloys

Cited by 4 publications

References 10 publications

Environmental effects on irradiation creep behavior of highly purified V–4Cr–4Ti alloys (NIFS-Heats) irradiated by neutrons

Environmental effects on irradiation creep behavior of highly purified V–4Cr–4Ti alloys (NIFS-Heats) irradiated by neutrons

Mechanical properties of neutron-irradiated vanadium alloys in a liquid-sodium environment

Study on the Effects of Liquid Thermal Media on the Irradiation Capsule of High-Temperature Materials

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