System to monitor boron-10 isotope (boric acid) concentration
The main function of the boron concentration monitoring system based on neutron solution analyzers NAR-I – automatic continuous measurement of boron-10 (boric acid) concentration in coolant at NPP power units with WWER-type reactors.
Composition of NAR-I:
- main equipment – detection devices (sensors) and data conversion and processing devices (UPO) arranged as follows:
- NAR-I-N – completed with a mounted sensor UDt-1N (is installed on technological pipelines);
- NAR-I2-N – completed with a UDt-1N mounted sensor with lower radiation level;
- NAR-I2-NE – completed with a mounted sensor UDt-2N (includes a hydrogen-containing material shielding from neutron radiation);
- NAR-I-P – completed with a submersible sensor (is installed in tanks and reservoirs);
- NAR-I-Pr1 – completed with a one-channel flow-type sensor UDt-2Pr1 with one cuvette connected with a sampling line to a technological system;
- NAR-I-Pr2 – completed with a two-channel flow-type sensor UDt-2Pr2 with two cuvettes connected with sampling lines to technological systems;
- NAR-I-K – completed with a control-type sensor UDt-2K (is installed in a laboratory room);
- NAR-I-N-IS – completed with a mounted sensor and a symbol indicator indicating boric acid concentration in control rooms;
- NAR-I-P-IS – completed with a submersible sensor and a symbol indicator indicating boric acid concentration in control rooms;
- additional equipment (forms a part of supply as an option):
- Am-Be and Pu-Be fast neutron sources;
- an InS symbol indicator;
- a URO registration and display unit;
- an ShT technological cabinet for UPO, URO installation;
- a container to store and transport fast neutron sources.
Mounted detection device UDt-1N
Ensures measurement of boron-10 isotope (boric acid) concentration in pipelines with diameters equal to 89, 108, 133, 159, 325, 630 mm.
Mounted detection device UDt-2N
Ensures measurement of boron-10 isotope (boric acid) concentration in pipelines with diameters equal to 108, 159, 325 mm (separate versions of UDt for different diameters).
Submersible detection device UDt-1P
Ensures measurement of boron-10 isotope (boric acid) concentration in technological tanks and reservoirs with a protective sleeve with a diameter equal to 120 mm.
Flow-type detection device UDt-2Pr
UDt-2Pr carries out measurement of boron-10 isotope (boric acid) concentration in sleeves connected with sampling lines to NPP technological systems.
Two versions have been developed: UDt-2Pr1 (one-channel version) and UDt-2Pr2 (two-channel version).
The technological part ensures solution flow rate regulation, measurement of flowing solution parameters (pressure, flow rate).
System advantages:
High accuracy in continuous analysis
Absence of additional errors
Possibility to complete boron meters with Am-Be fast neutron sources with the life of 20 years;
Possibility to operate in emergency conditions
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