Document: NRC Regulatory Guide
Document ID: 7a56bfb8-74a8-4e94-beee-41e3e51e0cc2
Document Type: regulatory_guide
Title: Wide-Range Spent Fuel Pool Level Instrumentation + HISTORY - HISTORY 11/2015 – DG-1317 , Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1424/ML14245A454.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.227
CFR Part: 
CFR Title: 

Content:
ly, this clarification is intended to remove the potential confusion regarding the extent of design basis shock and vibration loadings that may be different from the design basis seismic loadings. The paragraph after the third bullet under the subheading “Guidance” in section 3.4 of NEI 12-02 states, in part, “Readily available commercial components shall be considered.” (emphasis added) Staff Position: Commercial components may be considered, but the licensee may consider using augmented quality components, up to and including the quality and capability of components typically used in safety-related applications. 3.4 Qualification – Seismic The first bullet under the section “Seismic” in section 3.4 of NEI 12-02 makes a provision for “…instrument channel components… supplied by manufacturers with commercial quality programs… with seismic requirements… and commercial design and testing for operation in environments where significant seismic effects are common.” Staff Position: The guidance in this clause does not adequately address seismic levels and frequencies seen at the installation location or methods for demonstration. Demonstration of seismic motion consistent with that of existing design basis loads at the installed location is adequate. Quality programs are addressed in Appendix A-1 of NEI 12-02, Revision 1. The second bullet under the subheading “Seismic” in section 3.4 of NEI 12-02 makes a provision for demonstrating adequacy of design and installation to account for seismic effects which includes “…substantial history of operational reliability in environments with significant vibration.” DG-1317, Page 7 Staff Position: Typically, vibration is an effect that occurs at higher frequency and lower amplitude than that of seismic motion. Consequently, seismic design and installation adequacy cannot be reasonably demonstrated solely through operational history of performance of components when subjected to vibration. The