United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for May 10, 2004

Headquarters Daily Report

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REGION II

STEAM GENERATOR TUBES DEGRADED - UPDATE

Licensee/Facility:

SOUTHERN NUCLEAR OPERATING CO., INC.
Vogtle 2
WAYNESBORO, Georgia
Dockets: 05000425
[2] W-4-LP
License No:
Notification:

MR Number: 2-2004-0006
Date: 05/10/2004

Call from SRI

Discussion:

This Morning Report provides updated information concerning confirmed outer diameter (OD) circumferential cracks in Unit 2 steam generator (SG) tubes. Unit 2 is currently in a scheduled refueling outage. The licensee has completed 100% eddy current testing (ECT) of SG hot leg tubes in all four SGs. The results of the ECT identified one tube in SG 1, two tubes in SG 2, three tubes in SG 3, and two tubes in SG 4 with OD cracking. All tubes were stabilized and plugged. Two tubes have been pulled in SG 2 for further analysis to determine the degradation mechanism.

The highest indication by ECT of thru-wall cracking was 38%. This tube was one of the two tubes pulled so the actual thru-wall percentage will not be known until analysis is complete.

This information is current as of 12:00 p.m. 5/10/2004.

Accession Numbers:

Accession No Accession Date
ML041310366 05/10/2004

Contacts:

Name Office Abbrev Phone No E-Mail
BONSER, BRIAN R R2 (404) 562-4540 BRB1@nrc.gov
Page Last Reviewed/Updated Thursday, March 29, 2012