Filter
Top Products
Maintenance, Calibration, and Troubleshooting
Maintenance
5
5-1
Section 5
Maintenance, Calibration, and Troubleshooting
5.1 Maintenance
The monitor is designed to operate for long periods in the containment without attention. The following
replacement schedule should keep the monitor in trouble-free operation.
Every five years - Replace the 4200 microfarad electrolytic capacitor, P/N 92-3005-A (C1 01), and the RFI
line filter, P/N 92-9015A (FL101), located on the 876-1-78 mother board of the 876A-1-108 or 876A-100
Readout Module.
Whenever detector cables are removed - Replace the nickel seals, P/N 877-1-60-1, on the detector
connectors as described in the CABLE-877 procedure in Appendix A.
5.2 Calibration
The monitoring systems require calibration before placing them into service. In addition, they should be
recalibrated at regular intervals during routine service. The length of time between calibration intervals
should be determined by operations personnel. For further calibration information, refer to the applicable
calibration procedure provided in Appendix A.
The high-range containment area monitor underwent a complete electronic and isotopic calibration prior
to leaving the Fluke Biomedical plant. The same electronic calibration procedure is supplied in this
manual. Prior to primary isotopic calibration, the detector's hermetically must be verified. Primary isotopic
calibration requires a highly radioactive source (greater than 400 curies) with National Bureau of
Standards (NBS) traceability. As this is beyond the capability of most facilities to perform, the following
method of verifying detector calibration is used:
Detectors shall either be returned to Fluke Biomedical at a five (5) year interval from the date of delivery
or the owner must establish a procedure to determine that the average A/R/h output current does not
deviate from original factory calibration by more than ± 10%.
To encompass Nureg-0737 guidelines, on-site in-situ calibration checks can be performed with the 878-
10 High-Range Field Calibrator that is capable of producing a 10 R/h indication on the channel under
test.
Electronic alignment of the 876A Readout may be performed using Functional Test Procedure, TP876A-
1-108 included in Appendix A, and the standard test equipment as listed in Table 5-1. Personnel must be
fully knowledgeable in the operation of the readout prior to attempting to perform the test.
Disconnect Detector 877-1 from Readout Module
876A-1 by removing cables from J1 and J2 before
starting electronic calibration.
NOTE