ENS 50434

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v t e ENS Event
04:00 Jun 18, 2014
Title	Part 21 - Failure to Meet Specified Irradiation During Testing of Coated Test Panels
Event Description	The following information is a synopsis of information received via facsimile: Underwater Construction Corporation (UCC) was notified by Steris Isomedix Services (SIS) that test panels coated with Bio-Dur 560Blue epoxy coating, which SIS had been contracted to irradiate to a minimum accumulated dose of 1000 Mrad, could possibly have received a dose of only 949 Mrad due to a variance of 5.1 percent not previously reported on the Steris Component Irradiation Certificate. Bio-Dur 560Blue is a Service Level I coating. Failure to meet irradiation requirements for qualifying Service Level I coatings could result in the coating disbonding from the substrate, thus clogging Emergency Core Cooling Strainers during a postulated Loss of Cooling Accident (LOCA). Bio-Dur 560Blue was used to reline the toruses at Peach Bottom Units 2 and 3. Also, 588 square feet of Bio-Dur 560Blue was applied to the liner of the suppression pool at Limerick Unit 1. UCC notified Exelon concerning the irradiation failure and provided the following recommendations: - Perform evaluation of their Safety Analysis Report to determine if 949 Mrad meets licensing commitments. - Perform a review and determine if Supplemental Test Report per Exelon Contract 00045628, Release 00735, whereby irradiation testing of Bio-Dur 560Blue was performed to 1000 Mrad by University of Massachusetts will provide reasonable assurance that coating will not fail during a LOCA. Notification to NRC provided by Les Ayer, UCC QA Manager, 860-767-8256, x-169.

ENS 50434 +/-
Where
Underwater Construction Corporation Essex, Connecticut (NRC Region 1)
Organization:	Underwater Construction Corporation
Reporting

10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+1980.68 h82.528 days <br />11.79 weeks <br />2.713 months <br />)
Opened:	Les Ayer 16:41 Sep 8, 2014
NRC Officer:	Donald Norwood
Last Updated:	Sep 8, 2014
50434 - NRC Website
v • d • e

v t e Emergency Notification System
Underwater Construction Corporation with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2014-06-18T04:00:00 [Table view]
[ENS list for Underwater Construction Corporation]

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