It looks like they are having trouble buying quality MSIV parts. They have parts inspector and quality inspector on site, how did it get past them? Did they get the pilot valve in the Chinese black market?
How long was the pilot valve in the plant?
How long was the pilot valve in the plant?
They have many millions of parts and components in a plant...if enough go bad, then they will be scraming and shutting down all the time.
NMP1 Licensee Event Report 201 5-004, Automatic Reactor Scram Due to Main Steam Isolation Valve Closure
The root cause of the event was an inadequate application of the designed pilot test valve for MSIV control. Design tolerances between the spool and cage assemblies of this component are very small which is susceptible to binding. The binding was caused by inadequate provisions in the design of the pilot valve to ensure that proper alignment is obtained during assembly.
No comments:
Post a Comment