Measurement of gas flow rates in exhaust ducts for radioactive plants are essential from process as well as radiation safety requirements. Averaging Pitot Tube (APT) is mechanical device which generates differential pressure proportional to flow rate when inserted in the path of the flow. In this paper we discuss the reason for the selection of this particular type of flow measurement technology, design and testing methodology followed, challenges in installation & commissiong and implementation of advanced wireless communication for signal transmission from field to control room.
Criticality Alarm System (CAS) is mandatory in nuclear fuel fabrication and reprocessing facilities for round-the-clock monitoring of criticality accident. The CAS shall not fail to detect any criticality event or trigger a false criticality alarm. To meet this requirement, online fault diagnostics, surveillance for CAS electronics from the control room is mandatory. A fault diagnostic system is developed to detect the failures associated with AC mains, low voltage, high voltage, system on battery, battery isolation diode and single-channel alarm of each CAS. It is connected to the plant alarm annunciation based on fail-safe condition.
The selection of materials for each component of light fixture such as glass tube, terminal electrodes, holder etc. also very important to survive high level radiation (approximately 1.15E+04 R/h) inside the hot cell with minimum reduction in lux output from the light fixture. A 40 W Heat pipe based Cob LED lamp with copper fins was selected as suitable for application. This paper also discusses the experimental setup prepared for development and calculations made.
The objective of this paper is to discuss recent developments and our experience in testing, qualification & operation of RPM’s and compare various standards (ANSI, IEC & ASTM) associated with them.
Qualification of RPM’s as per specified Minimum Detectable Activity (MDA) is challenging owing to background intensity variation in operating areas. This paper also talks about acceptable false alarm rates, position of RPM’s in nuclear facilities, measurement time (Walk through vs Wait in Monitor), Optimal Testing & calibration interval and in- situ calibration of RPM’s after installation in site.
NDAS, a 2-tier architecture VME bus based system, consisting of a M68020 CPU card and 5 VME based A16/D16 double Euro 30-ch analog input (AI) cards was developed. VME application software is developed using C, compiled using tasking cross compiler and fused into EPROM. The GUI for NDAS is developed using Qt kit on Linux platform.
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