Mirion Technologies KNK-KNU 50 User Manual
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radiation monitoring
systems
A Mirion Technologies Division
KNK/KNU 50
Neutron Flux Instrumentation
KNK/KNU 50
Neutron Ionization Chambers
The KNK/KNU 50 neutron ionization chambers are
designed for neutron ux monitoring in ex-core
positions. The neutron sensitivity of these ionization
chambers is achieved by the coating of one electrode
with enriched boron-10. Thermal neutrons react with
the isotope boron-10 emitting alpha particles, which
produces ionization in the gas within the detector.
Their discharge on the electrodes causes charge pul-
ses. These charge pulses are integrated to a DC cur-
rent, which can be measured in the external circuit.
APPLICATIONS
• Operational process monitoring
○ Measurement of the neutron ux densitiy outside
the reactor core for power reactors and research
reactors in the intermediate range (KNK 50) and
power range (KNU 50)
RELATED PRODUCTS
• Proportional counters BF3 lled
• Self-powered neutron detectors
• Digital signal processing channels for start-up and
power range
FEATURES
● Wide measuring range
● Simple and rugged construction
● Saturation proof
● Large and steady sensitive length
● Output signal: DC current starting at 1 pA
● Compensation of gamma radiation (KNK 50)
● LOCA proof (KNK 50 SAC)
Since norms, speci cations and designs are subject to occasional change, please ask for con rmation of the information given in this publication.
Mirion Technologies (MGPI) SA
Route d’Eyguières
FR-13113 Lamanon
France
T +33 (0) 4 90 59 59 59
F +33 (0) 4 90 59 55 18
Mirion Technologies (MGPI) Inc
5000 Highlands Parkway
Suite 150
Smyrna, GA 30082
USA
T +1 770 432 2744
F +1 770 432 9179
Mirion Technologies (MGPI H&B) GmbH
Landsberger Strasse 328a
DE-80687 Munich
Germany
T +49 (0) 89515 13-0
F +49 (0) 89515 13 169
Mirion Commercial (Beijing) Co., Ltd.
Shanghai Jiangchang Commercial Branch
Room 801, 78 Jiangchang SanLu
Zhabei District, Shanghai 200436
PR of China
T +86 21 6180 6920
F +86 21 6180 6924
KNK/KNU 50
Neutron Flux Instrumentation
TECHNICAL CHARACTERISTICS
Notice: 1 nv = 1 neutron/cms
www mirion com
144973EN-B
348 205 EN-D
Type Sensitivity
(A/nv)
Measuring Range
(nv)
Total Length Operating Temperature Remarks
Continuous 3h max.
KNK 50
KNK 50 SAC
3.3e-14; 4.2e-14
3.3e-14; 4.2e-14
1e2 ... 1e10
1e2 ... 1e10
555; 665 mm
(21.8; 26.1 in)
555; 665 mm
(21.8; 26.1 in)
0 ... 85°C
(32 ... 185°F)
0 ... 150°C
(32 ... 302°F)
120°C
(248°F)
180°C
(356°F)
E,P,O
E,M,T,L
KNU 50(S) 1.2 ... 4.2e-14 1e5 ... 1e10 300 ... 665 mm
(11.8 ... 26.1 in)
0 ... 85°C
(32 ... 185°F)
0 ... 150°C
(32 ... 302°F)
120°C
(248°F)
180°C
(356°F)
P,T
M,T
E = electrically compensated M = mineral cable O = operational L = LOCA proof
P = plastic cable experience T = type tested
COMMON DATA
● Detector diameter: 50 mm (1.9 in)
● Detector length: see table
● Operating voltage: +800V typ.
● Compensation voltage (KNK 50): 0 ... -500V
● Filling gas: pure nitrogen, 1 bar
● Housing and electrodes: pure aluminium
● Insulators: alumina ceramic
DIGITAL SIGNAL PROCESSING CHANNELS TK 250
Mirion Technologies (MGPI H&B) GmbH offers type tested
neutron ux monitoring channels system TK 250 for signal
processing of the output signals of KNK/KNU 50 neutron
ionization chambers, and for all other types of neutron
detectors:
● DAK 250-g: digital start-up channel
for the pulse range and for the intermediate range
● DGK 250: digital power range channel
These signal processing channels are characterized by
ef cient functions, useful procedures for periodic testing,
a comfortable operator’s interface structure, and a stable
operational behaviour. They are designed and quali ed
for applications within the reactor protection system.
Schematic diagram of KNK 50
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