16 juillet 2014
Les opérateurs des réacteurs concernés par ce problème ont été alertés par Westinghouse. Des défauts liés à la présence de ce type de boulons ont déjà été constatés sur des pompes.
Type : PWR - Puissance : 3 459 MWth - Première divergence n° 2 : 08/1980
Available in english only.
Event Number : 50279
Rep Org : WESTINGHOUSE ELECTRIC COMPANY
TOWNSHIP State : PA
Event Date : 07/14/2014 - Event Time :
Emergency Class : NON EMERGENCY 10 CFR Section : 21.21(d)(3)(i) - DEFECTS AND NONCOMPLIANCE
Event Text
PART 21 REPORT - POTENTIAL FAILURE OF REACTOR COOLANT PUMP TURNING VANE BOLTS
The following was excerpted from a report received via fax from Westinghouse :
This issue concerns the potential failure of certain Westinghouse reactor coolant pump (RCP) turning vane bolts that employs turning vane bolts that are 1.0 inch nominal size, made from A286 material. These bolts hold the turning vane diffuser assembly in place inside the RCP, above the pump impeller. Bolt failures have occurred at on plant such that the running vane-diffuser assembly dropped inside three of the four RCPs and in two of these RCPs the assembly contacted the impeller.
These bolts are part of the model 93A RCPs delivered to Salem Unit 2 and Surry Units 1 and 2.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140715en.html