NL-15-0341, Clarification of Response to Request for Additional Information on Spring 2013 Steam Generator Tube Inspections (TAC No. MF4288).: Difference between revisions

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{{Adams
#REDIRECT [[NL-15-0341, Clarification of Response to Request for Additional Information on Spring 2013 Steam Generator Tube Inspections]]
| number = ML15054A536
| issue date = 02/23/2015
| title = Clarification of Response to Request for Additional Information on Spring 2013 Steam Generator Tube Inspections (TAC No. MF4288).
| author name = Pierce C
| author affiliation = Southern Co, Southern Nuclear Operating Co, Inc
| addressee name =
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000425
| license number =
| contact person =
| case reference number = NL-15-0341, TAC MF4288
| document type = Letter type:NL, Request for Additional Information (RAI)
| page count = 4
| project = TAC:MF4288
| stage = Response to RAI
}}
 
=Text=
{{#Wiki_filter:Charles R. Pierce                Southern Nuclear Regulatory Affairs Director      Operating Company, Inc.
40 Inverness Center Parkway Post Office Box 1295 A
Birmingham, AL 35242 Tel  205.992.7872 Fax 205.992.7601                    SOUTHERN COMPANY February 23, 201 5 Docket Nos.: 50-425                                                    NL-1 5-0341 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Vogtle Electric Generating Plant - Unit 2 Clarification of Response to "Request for Additional Information on Spring 201 3 Steam Generator Tube Inspections (TAC No. MF4288)"
Ladies and Gentlemen:
By letters dated July 2, 201 3 (Agencywide Documents Access and Management System (ADAMS) Accession Number ML13184A269) and September 26, 201 3 (ADAMS Accession Number ML14170A021 ), Southern Nuclear Operating Company, Inc. (SNC) submitted information summarizing the results of the spring 201 3 steam generator (SG) tube inspections performed at Vogtle Electric Generating Plant, Unit 2. These inspections were performed during refueling outage 1 6 (RFO 1 6). In a letter dated April 25, 201 3 (ADAMS Accession Number ML13112A225), the U.S. Nuclear Regulatory Commission (NRC) staff summarized two conference calls that were held with the licensee during RFO 1 6.
The N RC issued a request for additional information (RAI) via a letter dated November 1 3, 20 1 4 (ADAMS Accession Number ML14314A878), which was answered by SNC via letter dated January 1 2, 201 5 (ADAMS Accession Number ML15013A023). Following receipt of this letter, the NRC and SNC participated in a clarification call on February 2, 201 5. Additional information was requested from SNC to further explain the response to RAI question number five in the January 1 2, 201 5 letter. The enclosure to this letter contains the SNC response to that request.
This letter contains no NRC commitments. If you have any questions, please contact Ken McElroy at (205) 992-7369.
Respectfully s    "ed, c.11 C. R. Pierce Regulatory Affairs Director CRP/EGA
 
U . S. Nuclear Regulatory Commission NL-1 5-0341 Page 2
 
==Enclosure:==
 
SNC Response to Request for Additional Information Question Number 5 cc:    Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bast, Executive Vice President & Chief Nuclear Officer Mr. D. R. Madison, Vice President - Fleet Operations Mr. M. D. Meier, Vice President - Regulatory Affairs Mr. B. K. Taber, Vice President - Vogtle 1 & 2 Mr. B. J. Adams, Vice President - Engineering Mr. G. W. Gunn, Regulatory Affairs Manager - Vogtle 1 & 2 RType: CVC7000 U. S. Nuclear Regulatory Commission Mr. V. M. McCree, Regional Administrator Mr. R. E. Martin, NRR Senior Project Manager - Vogtle 1 & 2 Mr. L. M. Cain, Senior Resident I nspector - Vogtle 1 & 2 State of Georgia Mr. J. H. Turner, Environmental Director - Protection Division
 
Vogtle Electric Generating Plant - Unit 2 Clarification of Response to "Request for Additional Information on Spring 201 3 Steam Generator Tube Inspections (TAC No. MF4288)"
Enclosure SNC Response to Request for Additional I nformation Question Number 5
 
Enclosure to NL-1 5-0341 SNC Response to RAI 5 NRC Question 5 A "historical" tube wear indication in SG 4 was reported. In reviewing the prior inspection report submitted to the N RC, no reference was made to this indication. Please confirm that this indication was detected in the prior inspection and that all indications are being reported.
SNC Response to RAI 5 in the January 1 2, 2015 letter Tube SG4 R1 2C57 was previously identified as a volumetric indication associated with Mechanical Wear and Wall Loss from Secondary Side Cleaning activities reported in the Unit 2 Refueling Outage 1 3 inspection report (Reference ADAMS Accession Number ML090990606) .
This indication has been re-categorized as loose part wear based on evaluation of location and eddy current signal character in the Unit 2 Refueling Outage 1 6. No progression of growth has been identified and no foreign objects have been associated with this indication. I ndications a re reported as they are identified. The indication associated with SG4 R 1 2C57 was identified prior to Unit 2 Refueling Outage 1 5 (2R 1 5), and discussion of this tube indication was not included in the 2R1 5 inspection report.
Additional Information for SNC Response to RAI 5 The review of previous inspection reports and inspection results for Vogtle Unit 2 identified additional tubes that should have been included in the Vogtle Unit 2 Refueling Outage 1 5 report.
These indications were identified in Vogtle 2 Refueling Outage 1 3 and reported in the 2R1 3 inspection report (ML090990606) . These indications were confirmed in the Vogtle Unit 2 Refueling Outage 1 5 inspection with no progression of growth. Table 1 listed below contains the additional tubes that were not reported in the Vogtle Unit 2 Refueling Outage 1 5 report for Tube Wear and Wall Loss from the Secondary Side Cleaning Processes.
Table 1: Vogtle 2 Tube Wear and Wall Loss from Secondary Side Cleaning for 2R15 SG        Row      Col      Volts  lnd    %TWO          Locn 1          1      46      0.22    PCT        18    TSH+1 0.29 1          1      78      0.21    PCT        17      TSH+9.63 1          1      78      0. 1 3  PCT        12    TSH+1 1 .44 4        42      93      0.29    PCT      24      TSC+0.99 Definitions:
TSC - Tubesheet region on Coldleg side TSH - Tubesheet region on Hotleg side lnd - I ndication
                %TWO- Percent Through wall Depth Locn - Location PCT - Percent Volumetric Degradation E-1}}

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