Maintenance, Calibration, and Troubleshooting
Maintenance 5
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.
NOTE
Disconnect Detector 877-1 from Readout Module 876A-1 by removing cables from J1 and J2 before starting electronic calibration.
