EDN: GLSBWS
Authors & Affiliations
Askhadullin S.R., Milinchuk V.K., Epstein N.B.
Obninsk Institute for Nuclear Power Engineering, National Research Nuclear University “MEPhI”, Obninsk, Russia
Askhadullin S.R. – Post-Graduate Student. Contacts: 1, Studgorodok, Obninsk, Kaluga region, Russia, 249040. Tel.: +7 (910) 546-56-82; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Milinchuk V.K. – Professor, Dr. Sci. (Chem.).
Epstein N.B. – Professor, Dr. Sci. (Phar.).
Abstract
The quality standards for the primary coolant of VVER type reactors are ensured by the use of a slightly alkaline reducing coordinated potassium-ammonia-hydrazine mode with boron control (WCR). Fine control of the reactivity of the reactor is provided by the use of a liquid system with boric acid. The main advantage of such reactivity control is that the introduction of boric acid into the water coolant does not distort the neutron flux density field in the reactor core, since boron is evenly distributed in the circulating water. Boron reactivity control ensures deep reactor subcriticality in a cold state and during fuel refueling at coolant temperatures of 20–60 °C, compensates for slow changes in reactivity associated with fuel burnup, stationary poisoning of uranium fission products by xenon and samarium, as well as heating and cooling down the reactor. The introduction of boric acid into the coolant of the VVER reactor favors the corrosion of structural materials. To reduce their corrosion, the pH value of the coolant is maintained at ~5.7. To do this, solutions of alkali metal hydroxides (lithium, sodium, potassium) and ammonia are introduced into the coolant. Potassium hydroxide KOH is used in VVER-type reactors and lithium hydroxide LiOH is used in foreign PWR-type reactors. This article presents the results of studies of the effect of boric acid, used in the soft control of the reactivity of the VVER reactor, on the generation of hydrogen by hydroheterogeneous compositions with aluminum.
Keywords
water, hydrogen, boric acid, aluminum, hydroheterogeneous composition, aluminum oxide, lithium hydroxide, potassium hydroxide
Article Text (PDF, in Russian)
References
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UDC 629.9+544 (075)
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2023, no. 2, 2:13
