EP 1444702 B1 20100630 - METHOD FOR RECOVERING sp 10 /sp BORON OR DECONTAMINATING BORON FROM EVAPORATOR BOTTOMS FROM PRESSURIZED WATER REACTORS
Title (en)
METHOD FOR RECOVERING sp 10 /sp BORON OR DECONTAMINATING BORON FROM EVAPORATOR BOTTOMS FROM PRESSURIZED WATER REACTORS
Title (de)
VERFAHREN ZUR RÜCKGEWINNUNG VON 10BOR ODER DEKONTAMINATION VON BOR AUS VERDAMPFERKONZENTRATEN VON DRUCKWASSERREAKTOREN
Title (fr)
PROCEDE DE RECUPERATION DE sp 10 /sp BORE OU DE DECONTAMINATION DU BORE CONTENU DANS DES CONCENTRES D'EVAPORATION DE REACTEURS A EAU PRESSURISEE
Publication
Application
Priority
- DE 10156119 A 20011115
- EP 0212772 W 20021114
Abstract (en)
[origin: WO03043027A1] 10boron is recovered or boron is decontaminated from evaporator bottoms from nuclear power stations, in particular, pressurized water reactors by: (a) acidifying the evaporator bottoms, which primarily contain sodium borates provided as the boron compounds, with sulfuric acid to a pH value ranging from 3.5 to 5.5; (b) the resulting boric acid is crystallized out and separated out at a temperature ranging from 2 to 5 °C; (c) the remaining sodium sulfate solution is neutralized and either (i) evaporated or (ii) concentrated, and the sodium sulfate is crystallized out, whereupon; (d) the sodium sulfate is recovered. The recovered boric acid can be recycled as neutron absorbers or can be disposed of in a decontaminated form.
[origin: WO03043027A1] <sp>10</sp>boron is recovered or boron is decontaminated from evaporator bottoms from nuclear power stations, in particular, pressurized water reactors by: (a) acidifying the evaporator bottoms, which primarily contain sodium borates provided as the boron compounds, with sulfuric acid to a pH value ranging from 3.5 to 5.5; (b) the resulting boric acid is crystallized out and separated out at a temperature ranging from 2 to 5 °C; (c) the remaining sodium sulfate solution is neutralized and either (i) evaporated or (ii) concentrated, and the sodium sulfate is crystallized out, whereupon; (d) the sodium sulfate is recovered. The recovered boric acid can be recycled as neutron absorbers or can be disposed of in a decontaminated form.
IPC 8 full level
G21F 9/06 (2006.01)
CPC (source: EP)
G21F 9/06 (2013.01)
Designated contracting state (EPC)
CH DE FR LI
DOCDB simple family (publication)
WO 03043027 A1 20030522; DE 10156119 A1 20030605; DE 50214514 D1 20100812; EP 1444702 A1 20040811; EP 1444702 B1 20100630
DOCDB simple family (application)
EP 0212772 W 20021114; DE 10156119 A 20011115; DE 50214514 T 20021114; EP 02803027 A 20021114