"
10 CFR 50, Appendix B, Criterion III, Design Control states, in part, that the desig
control measures shall provide for verifying or checking the adequacy of design
such as by the performance of design reviews, by the use of alternate or simplifie
calculation methods, or by the performance of a suitable testing program. Contrar
to the above, the licensee did not adequately evaluate, or use other means t
demonstrate, that the RHRSW flow control valves operating in the normal flo
regimes would not cause cavitations and subsequent vibration such that the RHRS
piping would remain functional. As a result, a flow induced vibration high cycl
fatigue failure occurred at a welded connection for a vent valve. This issue wa
entered into the licensees corrective action program under CR 2008102081. Thi
finding is of very low safety significance because it did not result in a loss of syste
safety function of the Unit 2
RHRSW system