3 juin 2014
Le problème est considéré comme mineur car le réacteur n’a pas encore été chargé en combustible.
Available in english only.
Event Number : 50166 - Facility : WATTS BAR - State : TN -
Unit : [2] - RX Type : [2] W-4-LP
Event Date : 06/03/2014 - Event Time : Available in english only Emergency Class : NON EMERGENCY 10 CFR Section : 50.55(e) - CONSTRUCT DEFICIENCY
Initial PWR : 0 % Current PWR : 0 %
Event Text
WATTS BAR UNIT 2 POTENTIALLY DEFECTIVE FUSES INSTALLED
"WBN [Watts Bar Nuclear] Unit 2 (under construction) determined that Littelfuse Part Number FLAS005.T fuses manufactured under three date codes are potentially susceptible to nuisance opening according to Littelfuse letter dated April 30, 2014. Littelfuse Part Number FLAS005.T fuses are commercial grade and dedicated by TVA for use as a basic component in safety related systems. No confirmed examples have been identified that would have created a substantial safety hazard at this time. The potentially defective fuses were purchased for WBN Unit 2 and have been installed on WBN Unit 2 only. No potentially defective fuses have been installed on WBN Unit 1, SQN [Sequoyah] Units 1 or 2, or BFN [Browns Ferry Nuclear] Units 1, 2, or 3. At this time, there is no safety significance because fuel has not been loaded on WBN Unit 2. Installed and potentially defective Part Number FLAS005.T fuses will be replaced prior to obtaining a WBN Unit 2 Operating License. This issue has been documented in TVA’s corrective action program as Problem Evaluation Report 878252 and is being conservatively reported by WBN Unit 2 under 10 CFR 50.55(e)."
The licensee has notified the NRC Resident Inspector.
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