Ultra Electronics Energy

Ultra Electronics offers a wide range of neutron flux detectors designed for use in reactor safety and indication systems. These cover operation from start-up to full power with detectors available to operate in pulse mode, (start-up), direct current ion chamber mode (full power) and Campbelling or variance mode (intermediate or wide range cover). To achieve this coverage the gas fillings and neutron sensitive coatings of enriched boron or enriched uranium are chosen to meet user requirements.

Devices are available in a range of sizes and for differing environments. These range from detectors designed to operate ex-core at temperatures up to 180ºF (80ºC) to those designed and certified for operation in-core at temperatures up to 1020ºF (550ºC) and at pressures up to 650 psi (45 bar). In-core variants are installed in all the UK Advanced Gas-Cooled Reactors (AGR’s) where they are directly exposed to the reactor coolant gas.

A range of miniature detector types have also been designed and exported for use in both research and water reactors.

Typically, the low temperature detectors are fitted with coaxial or triaxial polymer sheathed cables whereas the high temperature variants are fitted with mineral insulated cables complete with integral sealed cold-end terminations and connector assemblies. Further variations in the specific construction of the interconnecting cables are possible. The low temperature detectors can be fitted with PEEK radiation resistant cables and the high temperature variants can be fitted with colaminax mineral insulated cables (utilising laminated metallic shielding in the cable outer sheath) for those plant situations where very good electrical interference immunity is required.

NEUTRON FLUXDETECTORS

Energy

SUITABLE FOR USE IN HIGH NEUTRON FLUX FIELDS; 1019 NVT LIFETIME EXPECTANCY

IN-CORE AND EX-CORE MODELS AVAILABLE FOR UP TO 1020 ºF (550 ºC) OPERATING TEMPERATURE AND 650 PSI OPERATING PRESSURE

PULSE AND DC CURRENT OPERATING MODES ALLOW FULL REACTOR POWER SPECTRUM TO BE COVERED

WIDE RANGE PULSE-CAMPBELL OPERATING DEVICES AVAILABLE

MINATURE VARIANTS AVAILABLE FOR FLUX MAPPING AND OTHER SPACE LIMITED APPLICATIONS

BESPOKE DESIGN SERVICE WITH POST INSTALLATION TESTING AND SUPPORT

FOR NUCLEONIC SYSTEMS

Ultra Electronics reserves the right to vary these specifications without notice. © Ultra Electronics Limited 2018. Produced in EnglandNFD002_2018

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Ultra Electronics ENERGYInnovation House, Lancaster RoadFerndown Industrial EstateWimborne, Dorset, BH21 7SQ, EnglandTel: +44 1202 850450Fax: +44 1202 850451Email: information@ultra-ncs.comwww.ultra-nspi.comwww.ultra-ncs.comwww.ultra-electronics.com

Ultra Electronics Energy

NEUTRON DETECTOR SPECIFICATIONS

FLUX DETECTOR TYPES

Ultra Model No.

Diametermm

Lengthmm

Max Temp oC

Current Mode A/nv

PulseMode Cps/nv

CampbellMode A2/Hz

Gamma Sensitivity

A/R/hr

Electrode Coating Material

Gas Filling

FISSION CHAMBERS

DC14 57 441 550 1.6E-14 235U Xe

P7A/2 38 345 550 0.01 235U Ar

P7A/22 38 547 550 0.1 235U Ar + He

P8A/4 30 261 550 4.5E-15 0.026 5.8E-28 235U Ar + He

P8A/11 30 327 550 1.1E-14 0.065 7.5E-27 235U Ar + He

P8A/22 30 438 550 2.1E-14 0.13 3.2E-27 235U Ar + He

PNI 1049 51 349 80 0.2 235U Ar + N

PNI 1079/1 76 362 80 2.0E-13 235U Ar + He

PNI 1079/2 76 362 80 0.55 235U Ar + He + N

PNI 1192 32 335 80 1.6E-15 235U H + He

PNI 1500 38 350 350 2.3E-14 0.1 235U Ar

MINIATURE FISSION CHAMBERS

PNI 1186 9 131 300 0.001 235U Xe + He

PNI 1187 5 112 300 2.0E-17 2.0E-14 235U Ar + He

PNI 1188 9 131 300 4.0E-17 235U Xe + He

PNI 1211 5 89 300 1.0E-17 5.0E-15 235U Ar + He

BORON LINED ION CHAMBERS

DC12A 88 787 550 2.2E-14 4.6E-12 10B He

IN5 89 345 100 1.2E-14 2.5E-12 10B H

IN37 38 354 300 1.4E-14 2.2E-12 10B H

RC13 38 279 80 3.3E-15 3.0E-13 10B H + He

PNI 1078/1 76 495 80 4.2E-14 8.0E-12 10B H + He

PNI 1079/8 76 632 80 3.5E-14 7.5E-12 10B H + He

PNI 1326 89 340 150 2.0E-14 1.5E-12 10B H

PNI 1327 89 340 150 3.0E-14 2.3E-12 10B H + He