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[en] Applications of microprocessors in three representative areas of reactor instrumentation viz. control instrumentation, environment radiation monitoring and data logging in process instrumentation is presented. Advantages of the microprocessor over digital techniques are mentioned. (A.K.)
[en] The process and mechanisms for refueling the Advanced High-Temperature Reactor (AHTR) are currently undergoing preconceptual design. The instrumentation and controls (I and C) required for the fuel transfer are simultaneously under design as part of this process. Overall, the AHTR's refueling system will consist of a fully automated, optically guided mechanical transfer system with operator intervention only required for exception handling. The refueling system design remains too immature to enable selection of particular instrumentation components. This paper provides an overview of the refueling process for the AHTR, the I and C requirements for the refueling, the current I and C design and technology status, and the envisioned process for developing and validating the required technology.
[en] In recent years the maximum level of induced interference current which can normally be expected in instrumentation systems has been found to be in the region of 100mA rms. However, in the course of investigating interference problems abnormally high levels, of as much as 20A peak, have been found to originate from relay circuit interruption. A likely coupling mechanism for this source of interference is discussed and analysed and it is concluded that proper suppression of relays is practical, safe and beneficial. (author)
[en] An experimental simulation of a neutron boronometer was performed, reason being that there is hope of improving such a device for use in fission reactors. The importance of a neutron boronometer is heightened during refueling and potential boron dilution episodes. The safety significance is, of course, avoiding inadvertant criticality. The apparatus used was a Pu-Be neutron source suspended in the center of a 4800 ml beaker. A BF3 filled tube was used as a neutron detector. The beaker was filled with water, and boron conentrations were varied by simple addition of boric acid. The experimental results were compared with ANISN calculations. The calibration of the boronometer would depend on the precision with which ANISN calculations would model experimental results
[en] The viability of six commercial resistance thermometers is examined under reactor conditions; the sensitive element was P1-2 platinum wire of diameter 50 /mu/m. The resistances R/sub 0/ of the thermometers at 0/degree/C were 46.00/plus or minus/0.02 /OMEGA/while the ratios were R/sub 100//R/sub 0/.1.391/plus or minus/0.0007. The design and manufacturing technology have been described. The thermometers were irradiated in a VVR-M reactor. The thermometers were calibrated before and after irradiation outside the reactor by the reference-point method at temperatures of l00, 231.8, and 327.2/degree/C. 7 refs