20 mars 2015
Des erreurs d’usinages relevées sur les sièges de soupapes concernent les sites de Waterford 3 et Saint-Lucie. Les soupapes défaillantes ont été retournées au fabricant car les valeurs de fuites réelles ne correspondaient pas aux valeurs requises.
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Event Number : 50911
Rep Org : EMERSON PROCESS MANAGEMENT
Licensee : FISHER CONTROLS INTERNATIONAL LLC
City : MARSHALLTOWN State : IA
Notification Date : 03/20/2015 Notification Time : 14:49
Event Date : 06/06/2014 - Event Time :
Emergency Class : NON EMERGENCY 10 CFR Section : 21.21(d)(3)(i) - DEFECTS AND NONCOMPLIANCE 50.55(e) - CONSTRUCT DEFICIENCY
Event Text
PART-21 REPORT - VALVE SEAT LEAKAGE DEFECT
The following is a summary of a submitted facsimile :
"A valve plug originally supplied as a spare parts order was returned to Fisher after the customer discovered a machining error was present on the plug. The Type 461 valve plug has a groove machined across the seating surface of the plug. This groove is required to provide a controlled leak rate thru the valve when the plug is on the seat. The issue recently identified shows that the machined groove did not extend through the full length of the seat. This could lead to a situation in which the intended/required leakage for this design is not fully achieved."
Affected plants are : Waterford-3 and St Lucie.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2015/20150323en.html#en50911
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