DR-201 Reactivity-Monitoring Digital Meter

Description
DR-201 reactivity-monitoring digital meter is specially developed to track and measure the small reactivity in the reactor, and measure the big reactivity with eliminating the inter-space effect simultaneously.
1.Measure the control rod worth when the reactor starts;
2.Record the multiple related signals when the reactor starts;
3.Extrapolate the reactor criticality when the reactor starts;
4.Monitor the reactor criticality when loading or unloading fuels.

Characteristics
l To track and measure the small reactivity in real time. It can be used to monitor the power and reactivity on line and measure the small reactivity of temperature system, pressure system and other systems, in which there is no need to take the inter-space effect into consideration.
l To measure the big reactivity with eliminating the inter-space effect. The big negative reactivity measurement can be completed within one-time rod drop. And the inter-space effect will be eliminated effectively.
l The test for extrapolating the reactor critical. The additional accessorial function can help the users to complete the critical extrapolating.
l Wide usage: the users can modify the system setup and physics parameter setup according to the demands of different reactors.

1.Calculate the differential worth and integral worth of reactor control rod reactivity by measuring the detector output current from nuclear measurement system, when withdrawing or inserting the control rods, boron charging or dilution;
2.Record the multiple related signals and off-line analysis reactivity;
3.Extrapolate the rod withdrawal criticality with the control rod position signal and source count rate signal from other systems; Extrapolate the dilution criticality with the dilution capacity or boron concentration signal input by operators and the source count rate signal.
4.Monitor the criticality when loading or unloading fuels.

Specifications
l Quick response: response time of small reactivity tracking and measuring ≤0.2s
l High sensitivity: with ±0.5pcm for small reactivity monitoring
l Wide range for negative reactivity measurement: maximum measured negative reactivity reaches -2000pcm
l Measurement error:  < 5%
Current measure accuracy ≤1%
Current measure response time ≤1s
Reactivity measurement accuracy ≤4%;
Measurement accuracy for multiple related signals ≤1%.

Achievements
NPIC have provided this meter for Qinshan NPP and its extension projects, Qinshan Phase II NPP, Chashma NPP Phase II…

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