Title 10 of the Code of Federal Regulations Part 50, Appendix B, Criterion III, Design Control, requires, in part, that measures be established to assure that applicable regulatory requirements and the design basis, for structures, systems, and components are correctly translated into specifications, drawings, procedures, and instructions. Contrary to the above, on September 18, 1996, the licensee failed to adequately translate the design and licensing basis seismic requirements for the
residual heat removal system when installing shielding on valves RHR-V-144A, RHR-V-144B and RHR-V-145B under RFTS-96-10-003. Specifically, the licensee failed to account for the additional weight of the shielding that would add mechanical stress to the systems piping during a
safe shutdown earthquake. Following discovery by the licensee, the shielding on valves RHR-V-144A, RHR-V-144B and RHR-V-145B was removed. Subsequent evaluation by the licensee revealed that the additional shielding would add substantial stresses to the system piping but the stresses would still be below design specifications. This finding was entered in the licensees corrective action program as Action Requests
AR 00250306. This finding is greater than minor because it was associated with the design control attribute of the
Mitigating Systems Cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to
initiating events to prevent undesirable consequences. This finding is of very low safety significance because it was a design or qualification deficiency confirmed not to result in a loss of operability or functionality
