Document: NUREG-0800
Document ID: c6dbe9ec-b58d-4a77-85ee-47b58571c3c0
Document Type: srp
Title: Revision 6 - August 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A200.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
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Content:
ion. Additionally, the application of the standard using a graded approach is also appropriate for nonsafety system instrumentation maintaining design limits in the technical specifications. Basis for Instrument Calibration Intervals The applicant or licensee should evaluate the effects of extended calibration intervals on instrument uncertainties, equipment qualification, and vendor maintenance provisions to assure that an extended surveillance interval does not result in exceeding the assumptions stated in the safety analysis. Generic Letter 91-04, Enclosure 2, provides acceptable guidance for justifying extended calibration intervals through the use of data analysis, monitoring, and assessment. This approach has been used for plants to accommodate a 24-month fuel cycle change. For changes to surveillance test intervals for reasons other than a 24-month fuel cycle, the submittals have followed the risk informed approach and followed the guidance of RGs 1.174, 1.177, and 1.200. 4. Review Procedures The setpoint analysis methodology and assumptions should be reviewed to confirm that an acceptable analysis method is used and that the analysis parameters and assumptions are consistent with the safety analysis, system design basis, technical specifications, plant design, and expected maintenance practices. The following factors should be emphasized in the review: • Relationships between the safety limit, the analytical limit, the limiting trip setpoint, the allowable value, the setpoint, the acceptable as-found band, the acceptable as- left band, and the setting tolerance. • The reviewer should assure that the setpoint technical specifications meet the requirements of 10 CFR 50.36. Additional information related to setpoint technical specifications is provided in RIS 2006-17. • Basis for selection of the trip setpoint. • Uncertainty terms that are addressed. • Method used to combine uncertainty terms. • Justification of statistical combination. •