Document: NUREG-0800
Document ID: b09bdecd-fb52-4a15-ab35-7b597cbbaa13
Document Type: srp
Title: Appendix 7-A
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500546.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
f 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 HICB-12 for guidance on determining plant instrumentation tolerances. Appendix 7-A Rev. 4 — June 1997 BTP HICB-13-5 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 to the laboratory response time test data for the reference sensor. Correlation between LCSR test results for the existing sensors and LCSR test results for the reference sensor may be used to establish the correlation with the reference RTD laboratory test data. As-Found/As-Left Surveillance Data The applicant/licensee should maintain a database of the "as-left" and "as-found" calibration and response time tests for each sensor. To monitor systematic drift or degradation, at each refueling cycle a newly calibrated RTD or a new RTD with recent calibration data should be installed at