2/27/2024 0 Comments Laboratorijski reaktorJournal of Nuclear Materials, 381(3): 302-308īarale, M., Lefèvre, G., Carrette, F., Catalette, H., Fédoroff, M., Cote, G. (2008) Characterization of the surface charge of oxide particles of PWR primary water circuits from 5 to 320☌. Journal of colloid and interface science, 354(1): 306-17īarale, M., Mansour, C., Carrette, F., Pavageau, E.M., Catalette, H., Lefèvre, G., Fedoroff, M., Cote, G. (2011) Characterization of acid-base properties of two gibbsite samples in the context of literature results. The obtained results were in good agreement with the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory and used as such to interpret this industrial phenomenon.Īdekola, F., Fédoroff, M., Geckeis, H., Kupcik, T., Lefèvre, G., Lützenkirchen, J., Plaschke, M., Preocanin, T., Rabung, T., Schild, D. With model materials, hematite and sintered alumina, the adhesion rate and surface potentials of the interacting solids were measured under different chemical conditions (solution pH and composition) in analogy with the PWR ones. As better understanding of the adhesion mechanism is the key factor in the prevention of fouling and particle removal, an experimental study was carried out using a laboratory set-up. The deposition of hematite particles, originating from corrosion, on alumina seals of coolant pumps is suspected to be the cause. During the stretch-out phase in reactor operation, characterized by low boric acid concentration, the leak-off flow has been observed to abnormally evolve in industrial plants. In the primary circuit of pressurized water reactors (PWR), the dynamic sealing system in reactor coolant pumps is ensured by mechanical seals whose ceramic parts are in contact with the cooling solution. Dobijeni rezultati su bili u skladu sa Derjaguin-Landau-Verwey-Overbeek (DLVO) teorijom i kao takvi su korišćeni za interpretaciju industrijskog fenomena. Kao model materijali korišćeni su prah hematita i sinterovani aluminijum-oksid, a brzina adhezije i površinski potencijali ovih materijala u interakciji mereni su pri različitim hemijskim uslovima (pH i sastav suspenzije), analogno uslovima u PWR reaktoru. Pošto je razumevanje mehanizma adhezije od suštinskog značaja za prevenciju zakrečenja i uklanjanje čestica sa površina, izvedeno je eksperimentalno istraživanje primenom laboratorijskog uređaja. Najverovatniji uzrok ove pojave je deponovanje čestica hematita, kao produkta korozije, na keramičke zaptivke od aluminijum-oksida, koje su sastavni delovi rashladnih pumpi. stretch-out phase) u radu rekatora, za koju je karakteristična niska koncentracija borne kiseline, primećeno je nekontrolisano curenje u industrijskim postrojenjima. U primarnoj petlji nuklearnih reaktora sa vodom pod pritiskom (PWR), dinamički sistem zaptivanja kod pumpi za hlađenje obezbeđen je mehaničkim zaptivkama čiji su keramički delovi u kontaktu sa rashladnom tečnošću.
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