10 CFR 50, Appendix B, Criterion V, required, in part, that procedures for performing maintenance that can affect the performance of safety-related equipment should be properly preplanned and performed in accordance with written procedures, documented instructions, or drawings appropriate to the circumstances. This requirement included written procedures for post-maintenance testing of the RN system. Contrary to the above, written procedures for post-maintenance testing of the RN system were not appropriate to the circumstances. On July 24, 2010, following maintenance on the 2A RN strainer dP instrument loop, the licensee failed to include adequate post-maintenance instructions which would have included testing the 2A RN strainer dP instrument loop during high flow conditions experienced on the RN SNSWP supply and return
header. This violation was determined not to be greater than very low safety significance (Green) because it did not represent a loss of safety function of the 2A RN train. This condition was placed in the licensees corrective action program as
PIP M-10-05982
