Document: NUREG-1555
Document ID: d82f8007-705d-4b2b-b71e-c89f767b3572
Document Type: esrp
Title: METEOROLOGICAL MONITORING
Source: NUREG-1555
Source URL: https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1555/initial/
Revision Date: 2007-10
Chapter: 6
Section ID: 6.4
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CFR Title: 

Content:
ders are kept (instrument shelter or control room) for adequacy in accordance with the manufacturers’ specifications. Confirm the ability to obtain a direct readout from the recorders in situ during routine inspection of systems so that the reviewer will be able to relate the recorder output directly to what the sensor should be seeing. Some specific recommendations are contained in Regulatory Guide 1.23, Section C.3. Instrumentation Surveillance NUREG-1555 6.4-8 October 1999 When evaluating instrumentation surveillances, the reviewer should do the following: ` Review the inspection, maintenance, and calibration procedures and their frequency. - Compare the surveillance procedures and the frequency of attention that the instrumentation systems receive with operating experience at this site and at other sites with similar instrumentation to determine if acceptable data recovery with acceptable accuracy is likely throughout the duration of the meteorological program. - Review calibration reports and results to determine sensor stability and accuracy over the period of data collection. Guidelines for acceptable accuracy and acceptable data recovery are specified in Regulatory Guide 1.23, Sections C.4 and 5. Any deviations from Regulatory Guide 1.23 must be justified. Data Acquisition and Reduction To evaluate data acquisition and reduction, the reviewer should take the following steps: (1) Review the procedures, including both hardware and software, for data acquisition and reduction. Because there are many methods of acquiring data from meteorological measurement systems, the review procedure varies. The following basic components of the program should be reviewed: ` accuracy of measuring in units of direct measurement and their precision ` accuracy in conversion of direct measurement units to meteorological units ` accuracies involved in frequency and mode (instantaneous or average) of sampling ` time over which system outputs are averaged for final data