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Apr 19 – 22, 2022
Vienna, Austria
Europe/Vienna timezone
FR22 starts in Vienna 19 - 22 April 2022 Online Stream: https://event.do/iaea/a/#/events/5048

The working capacity analysis of boron carbide after two-year operation as an emergency protection material of the fast reactor

Apr 20, 2022, 10:40 AM
2h
Vienna, Austria

Vienna, Austria

POSTER Track 4. Fast Reactor Materials (Coolants, Structures) and Components Poster Session

Speaker

Mr Evgenii Kinev (JSC «INM»)

Description

The state of high enriched В4С (industrial and re-fabricated quality) consisting of emergency protection elements, irradiated up to neutron fluence 7x1022 cm-2 (Е>0.1 МeV), was investigated. The maximum burnup of an 10В isotope at two-year irradiation period has made 25 %. That burnup decreases on diameter and height of an absorber column. High local mechanical deformation of emergency protection element metal covers is found out in a maximum fluence zone. It is caused by swelling of neutron absorber material. At the same time, the metal keeps high values of durability and plasticity. Parameters of an irradiated industrial В4С crystal lattice ware amount to а=0.5540 nm and с=1.1835 nm. The halfwidth of X ray reflexes and level of micropressure have increased. According to hydrostatics weighing and electron microscopy, the swelling of industrial and re-fabricated В4С reaches 12 and 18 % respectively only in the bottom of absorbing elements at maximum fluence. Other parts of absorber column with smaller fluence and burnup swell slightly. Volumetric changes are caused by growth of closed porosity. The maximum swelling of irradiated industrial and re-manufactured materials was 25 and 30% respectively. The same initial values were about 19 and 23%. The value of closed porosity from industrial and re-fabricated B4C after irradiation was 14 and 21% versus the initial values of 4 and 9% respectively. Detected pores with a diameter more than 100 nm settle at the grain border. The size and concentration of pores increase with growth of neutron fluence and burnup. Pores cause the formation of microcracks between the boron carbide grains. The open porosity inside intensive swelling and mechanical interaction zone of absorber with the cladding is reduced. The forced fracture nature of the B4C changes from mixed nature with a predominance of intragranular splitting to a purely intergranular type. Functional working capacity of enriched В4С remains during reached burnup as well as after re-fabrication.

Country/Int. organization Russian Federation
Speaker's email address kinev_ea@irmatom.ru
Speaker's title Mr
Affiliation/Organization JOINT STOCK COMPANY «INSTITUTE OF NUCLEAR MATERIALS»

Primary authors

Mr Evgenii Kinev (JSC «INM») Mr Vladimir Pastuhov (JSC «INM») Mr Mihail Evseev (JSC «INM») Mr Vladimir Tsygvintsev (JSC «INM»)

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