TRIGA Instrumentation

The NLW-1000 wide-range logarithmic channel combines the functions of logarithmic counting and logarithmic current conversion to provide a continuous indication of reactor power from source level to full power. A remotely located pre-amplifier minimizes EMI and other sources of interference and adjustable discriminator and gain controls allow flexibility in channel calibration with existing detectors. A differentiator circuit provides continuous indication of rate of change of power, and self test functions can check count rate, current, period and high voltage. Provision is made for permissive operation by computer of all test functions.

The NMP-1000 is a wide range, linear current mode module with range switching. Ranges may be selected either manually or automatically, locally or remotely. Full scale sensitivities from 1 x 10-11 to 1 x 10-3 A are provided with indication of percent power on a front panel display as well as a front panel indication of each decade range. Compensation voltage as well as adjustable high voltage power supplies are provided in the module to allow operation with most existing current mode detectors.

NP-1000 and NPP-1000
The NP-1000 and NPP-1000 are advanced design neutron monitoring safety channels already in use at many research reactor installations worldwide. All NP-1000 channels feature current mode analog circuitry for percent power and pulse power monitoring (NPP-1000 only) using signals generated by an ionization chamber. They include a built-in pulse integrator circuit (NPP only) and connect to computer analysis systems and/or hard-wired scram systems. The integrity of NP-1000 output signals is assured by the use of isolation devices.

The NFT-1000 fuel temperature monitoring channel converts millivolt signals from thermocouples into a usable signal level for monitoring and display. It includes a dual trip unit, a calibrator module to test the channel trip functions as well as provide a fixed calibration point for verifying the correct operation of the unit, and an isolated transmitter module to drive external indicating-recording devices. The NFT-1000 is designed to be physically similar to the other modules in the line of analog instrumentation modules.