What I see on the broad picture; is many plants don't have the energy, resources and money to understand what is going on in their plant.
Your staff identified the primary root cause of the issue to be less than adequate legacy procedures used to develop plant modification change packages. Specifically, the legacy procedures contained an inadequate process to identify the need for further reviews and the level of design detail required by those reviews. In addition, your staff’s evaluations identified the apparent cause of the Division 3 SX pump failure to be a failure of those legacy procedures to maintain design control, resulting in application of a hardfacing material to the sleeves that lost integrity and delaminated under normal system operating conditions, causing greater sleeve to bushing friction, which increased temperatures and resulted in bushing failure. Your staff’s evaluations also identified the following contributing causes for the issue: (1) the original pump 1SX01PC had incorrect design specifications; (2) station management failed to provide effective corrective actions to address known equipment deficiencies; (3) suspended silt in the process fluid (lake water) that interacted with the pump internals resulted in higher operating temperatures and was anticipated to accelerate the effects of the apparent cause identified; (4) the operational profile that CPS used on the 1SX01PC pump contributed to fatigue and eventual delamination of hardfacing due to the frequent start/stop cycles; and (5) corrosion of sleeve materials may have contributed to crack propagation and hardfacing delamination.
No comments:
Post a Comment