Mirion Technologies DSK-250, DMK 250 User Manual
Featuring:
radiation monitoring
systems
A Mirion Technologies Division
DSK/DMK 250
Neutron Flux Instrumentation
DSK/DMK 250
Digital Power Range Channels
The DSK 250 and DMK 250 digital power range chan-
nels form part of the proTK™ product line. They have
been designed for local and average power range
monitoring (LPRM and APRM) in the boiling water
reactor (BWR). Four in-core ssion chambers may be
connected to one DSK 250. Hardware and software
of the DSK & DMK 250 are designed and quali ed
for applications at the level of the reactor protection
system.
APPLICATIONS
• Operational process monitoring
○ Safety related signal processing for neutron ux
power range monitoring in the boiling water reac-
tor: DSK 250 for the local power range monitoring
(LPRM); DMK 250 for the average power range
monitoring (APRM)
RELATED PRODUCTS
• In-core ssion chambers: e.g. WL 23630 (IST)
• DWK 250: digital wide range channel
FEATURES
Up to four detectors per DSK 250 (LPRM):
● Individual detector supply
● Signal ltering and calibration
● Remote test signal generators
● RS232/485 data interface for test and calibration
Up to 64 LPRM-signals (16 DSK) per DMK 250:
● Calculation of average value and ow related ux signal
(APRM)
● Neutron ux oscillation monitoring
● Generation of analog and binary signals for the reactor
protection system
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
DSK/DMK 250
Neutron Flux Instrumentation
www.mirion.com
144969EN-C
DETECTORS AND INPUT SIGNALS
● Miniature in-core ssion chambers, e.g. WL 23630
(IST), MNK/MBK 61 (Siemens-Areva)
● Cable to the DSK 250: coaxial cable, no limitation of
length
● Detector supply: -50 ... -200 V individually
adjustable for each detector
● Range of detector current: 32 ... 4000 μA adjustable to
full scale
● Input signal for coolant ow: 0/4 ... 20mA
DIGITAL SIGNAL PROCESSING
● 80C31 multi-processor system
● Program memory: EPROM
● Parameter memory: CMOS-RAM with integrated
Li-battery
● Data interface: RS232 and/or RS485
● Internal LC-display: 2 x 16 characters
● DSK 250 processes four detector signals in four
individual signal paths:
○ Calibration of detector signal to power density
○ Alarm threshold for local density in relation to coolant
ow
● DMK 250 accumulates up to 64 detector lines (16
DSK 250):
○ Calculation and calibration of average reactor power
○ Calculation of ow related ux and margin to scram
○ Flux oscillation monitoring combining transient sup-
pression and fast response
OUTPUT SIGNALS
● DSK 250: ux density for each detector position
● DMK 250:
○ Average ux
○ Flow related ux
○ Magnitude of ux oscillations calibrated to reactor
power, e.g. 0 ... 125 %Pn
● Analog outputs: 0/4 ... 20mA/600 Ω, insulated
● Binary outputs: insulated relay change overs,
60V/0.5A or 125V/1A
OTHER CHARACTERISTICS
● DC power supply: 18 ... 33 VDC, approx. 1.6A at 24 V
(each DSK and DMK)
● Optional: AC power supply: 230 VAC or 115 VAC
+10%/-15%, approx. 40 VA
● Operating temperature: 0 ... 70°C (32 ... 158°F) for the
main electronics
● Mechanical vibrations: < 5 g, 5 ... 100 Hz
● 19” modular system according to IEC 60297
● Rack size (W×H×D): 483 mm × 133 mm × 280 mm
(19 in x 5.2 in x 11 in)
● Plug-in boards: 100 mm × 160 mm (3.9 in x 6.3 in)
DSK 250
front view
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