Project of Decommissioning and Contaminated Water Management - Development of Small Neutron Detector
RosRAO, FSUE– Summary of the Project for Small Neutron Detector Development (phase 2)
Object & Goals
Based on results of the feasibility studies (Phase 1) of neutron detection technologies manufacture the industrial system for neutron flux
measurement ready-to-use at the real operating environment of Fukushima 1 NPPDevelopment of detailed design for corona counter based measurement system (SINAKS) and fission chamber based measurement- 1. 7zehxfyk7hesystem (KIN-IKD)
2. Launching onto industrial manufacturing of measurement system (SINAKS)
3. Verification of robustness and stability within external environmental parameters (vibration, humidity, electromagnetic interference &temperature).

Overview and Standout
Points of Project

Seismic stability tests

EMC tests

Fission chamber

KIN-IKD test system

SINAKS cabinet: general view

Software of KIN-IKD with digital processing algorithm-new CC
Radiation tolerance tests

Industrial corona counters (CC)Climatic stability tests

Software ofSINAKS withhealth checkand gamma
dose ratemeasurementalgorithm

Achieved Results by Now
0.18Digital signal processing (DSP): softwarealgorithms optimized (SINAKS)

DSP adapted and verified
for multilayer fission chamber

Dependence of corona counter sensitivity

Dependence of fission chamber sensitivity

Counter 002

Project specification achieved and outperformed

Old method
New method

0.16

0.08

0.14

0.07

0.12

0,17 n/(cm2*s)

Sensitivity cm20,1 n/(cm2*s)

1.1 Sensitivity

Corona counter2Project
specification

Efficiency, p*cm

Term

0.10
0.08

0.037
0.06
0.04

1.2 NeutronGamma
Discrimination

1000 Gy/h1337 Gy/h0,1 n/(cm2*s) –1000 n/(cm2*s)

2.1 Radiation
resistance

1 000 Gy

640 000 Gy

100

2.3 Others(water)

Submerged
operation

Submerged
operation

3.1 Dimension

cylinder of
20mm diam. x40mm

cylinder of
20mm diam. x
40mm*

400

500

600

700

800

120900 1000 1100 1200 1300

KNT-35LS with integrated preamplifier (DSP)
KNT-35LS with integrated preamplifier,analog signal processing

0.00

80

60

40208060402020406080

100

Amplitude, channel

120

2000

4000
Dose rate, Gy/h

6000

8000

Counter 21337 Gy/h+n10020406080

100120

Amplitude, channel

Iterative and sustainable progress in measurement system specification improvement from 1 st to 2nd Phases
CHM-11

CHM-F1 & CHM-F2

CHM-F3(conventional detector)
Initial data for 1st phase(prototypes)
1st phase results(industrial detector)
2nd phase results

Sensitivity with gamma
influent 1000 Gy/h----+↑ 2.6 times

Radiation tolerance, Gy/h

200

1000

1300

Gamma dose
measurement, Gy/h----up to 1600

up to 1650

Automatization level

manualsemi-automatic

full automatic

EMI protection

---

---

full protection(Project evolution)
Item0.03

0120

Counter 21337 Gy/hSeparation parameter, a.u.

40 ℃300Conception of two-dimension dynamic threshold(SINAKS)

Separation parameter, a.u.

40 ℃

200

Dose rate (Gy/h)

100

2.2 Heat
resistance

0.04

0.01
00,1 n/(cm 2*s)
– 1000n/(cm2*s)

0.05

0.02

0.02
0.00

1.3 Range ofmeasured
neutron flux

0.06

Resume:- Corona counter based system (SINAKS)
manufactured and tested in accordance withproject plan and met all the imposed
requirements
Corona counter’ applications verified for intense
gamma fields;- Downsized corona counters are manufactured
within industrial design.
SINAKS is developed to a ready-to-use industrial
product;- Improved digital signal processing algorithm for
SINAKS implemented within an upgradedsoftware;- Multilayer fission chamber based system (KINIKD) was adopted for digital signal processing
method..
Discrimination
andinterference
tolerance verified for designs with integrated anddetached preamplifier;- Developed a concept for block-modular
electronics integration of KIN-IKD and SINAKS;- Optional applications for SINAKS considered.