Document: NUREG-0800
Document ID: 81c8f1c3-ae6a-49e5-8289-f33ef409c663
Document Type: srp
Title: Revision 6 - August 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A240.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
on. The application temperatures should be within the manufacturer's highest calibration range. All data should be taken at isothermal plant conditions and all loops (hot legs and cold legs) should be at similar temperatures. If this condition cannot be assured then the applicant or licensee should provide for removal of one or more of the RTDs at each representative location and for replacement with a newly calibrated RTD. The applicant or licensee should provide an analysis which states the limits of acceptable calibration, response times, and in-situ testing of the RTDs. Test procedures, with acceptance criteria, should state the limits of the calibration, particularly the dependency of the data on uniform coolant temperature and flow. Correction factors or bias values should be established to compensate for non-isothermal conditions. Because plant temperatures cannot be perfectly controlled, fluctuations and drift in the primary coolant temperature might occur during in-situ testing. The test data should be corrected for the fluctuations and drift in the coolant temperature. If during the testing incomplete mixing of the reactor coolant should occur, the test data should be corrected for the temperature differences. Reactor coolant temperatures should be stable and uniform. In the event this is not the case the data should be corrected to account for these effects. Equipment used in the test should be accurate to within the necessary tolerance and have stable performance. See BTP 7-12 for guidance on determining plant instrumentation tolerances. Response Time Testing Even though response time testing is independent from the cross-calibration test, it should be performed for the existing and the newly installed reference sensors to account for installation effects and to identify degradation. The resulting test data and analysis should support correlation of each of the existing sensors in the common flow path to its laboratory response time test data, and also