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 UDt-1N mounted sensor (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 UDt-2N mounted sensor (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 UDt-2Pr1 one-channel flow-type sensor with one cuvette connected with a sampling line to a technological system;
• NAR-I-Pr2 – completed with a UDt-2Pr2 two-channel flow-type sensor with two cuvettes connected with sampling lines to technological systems;
• NAR-I-K – completed with a UDt-2K control-type sensor (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.

UDt-1N mounted detection device

Assures measurement of boron-10 isotope (boric acid) concentration in pipelines with diameters equal to 89, 108, 133, 159, 325, 630 mm.

UDt-2N mounted detection device

Assures 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).

UDt-1P submersible detection device

Assures measurement of boron-10 isotope (boric acid) concentration in technological tanks and reservoirs with a protective sleeve with a diameter equal to 120 mm.

UDt-2Pr flow-type detection device

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 assures solution flow rate regulation, measurement of flowing solution parameters (pressure, flow rate).

UDt-2K control-type detection device

UDt-2K assures:

• measurement of boron-10 isotope (boric acid) concentration in working standard solutions used for calibration of working mounted, submersible, and flow-type boron meters;
• measurement of boron-10 isotope (boric acid) concentration in solutions with unknown concentration;
• determination of a boron-10 isotope atomic fraction in boric acid.

UPO conversion and processing device

Functions:

• calculating boron-10 isotope (boric acid) concentration;
• indicating values in digital and graphical forms;
• transmitting information via redundant communication links of RS-485 interface and as a current signal (0-5 mA or 4-20 mA) to external subsystems.

InS symbol indicator

Functions:

• indicating current boron-10 isotope (boric acid) concentration in a digital form on panels of control rooms;
• generating a warning alarm discrete signal.

Container to store and transport

A container certified by absorbed dose rate, which is designated to store and transport one fast neutron source (Am-Be or Pu-Be).

The container is manufactured as a cart with a frame (rigidly fixed on it), into which a removable container is installed.

URO registration and display unit

Functions:

• generating NAR-I archive;
• monitoring operability of all NAR-I devices of a unit;
• displaying archive data, including boron-10 (boric acid) concentrations in any technological point on a panel computer’s touch screen;
• checking (calibrating) flow-type NAR-I.

To supply power to a panel computer an MPt power supply module is used.