CP-201500554, Response to Request for Additional Information, 2RF14 Steam Generator Tube Inservice Inspection Report
| ML15161A315 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 06/01/2015 |
| From: | Flores R, Madden F Luminant Generation Co, Luminant Power |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| CP-201500554, TAC MF5052, TXX-15085 | |
| Download: ML15161A315 (3) | |
Text
Luminant Rafael Flores Senior Vice President
& Chief Nuclear Officer rafael.flores@Luminant.com Luminant Power P 0 Box 1002 6322 North FM 56 Glen Rose, TX 76043 T 254 897 5590 C 817 559 0403 F 254 897 6652 CP-201500554 TXX-15085 Ref. # 10CFR50.55a June 1, 2015 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001
SUBJECT:
COMANCHE PEAK NUCLEAR POWER PLANT UNIT 2, DOCKET NO. 50-446 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION, 2RF14 STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT - TAC NO. MF5052
REFERENCE:
- 1)
Luminant Power letter, logged TXX-14127, from Rafael Flores to the U. S. Nuclear Regulatory Commission dated October 21, 2014, 2RF14 Steam Generator Inservice Inspection 180-Day Report
- 2)
Luminant Power letter, logged TXX-15067, from Rafael Flores to the U. S. Nuclear Regulatory Commission dated April 16, 2015, Unit 2, Docket No. 50-446 Response to Request for Information, 2RF14 Steam Generator Tube Inservice Inspection Report - TAC No. MF5052
Dear Sir or Madam:
By means of the letter in Reference 1, Luminant Generation Company LLC (Luminant Power) previously submitted the Comanche Peak Nuclear Power Plant (CPNPP) Unit 2 Model D5 steam generator tube inspection report for 2RF14 as required by Technical Specification 5.6.9. Luminant Power also provided response to a request for additional information (RAI) by means of the letter in Reference 2.
Based upon additional questions provided by Mr. Balwant Singal of the NRC in an email dated May 13, 2015, Luminant Power hereby provides clarification of information provided in the Reference 2 response.
The attachment to this letter contains the NRC questions followed by Luminant Power's response to the questions.
This communication contains no new licensing basis commitments regarding Comanche Peak Unit 2.
A047
U. S. Nuclear Regulatory Commission TXX-15085 Page 2 06/1/2015 Should you have any questions, please contact Mr. Jim Barnette at (254) 897-5866 or James.barnette@luminant.com.
Sincerely, Luminant Generation Company LLC Rafael Flores By: d
- W77)/*,--
./Fered W. Madden Director, External Affairs Attachment -
Luminant Power Response to the May 13, 2015 Request for Additional Information, 2RF14 Steam Generator Tube Inspection Report - TAC No. MF5052 c -
Marc L. Dapas, Region IV B. K. Singal, NRR Resident Inspectors, Comanche Peak
Attachment to TXX-15085 Luminant Power Response to the May 13, 2015 Request for Additional Information 2RF14 Steam Generator Tube Inspection Report TAC No. MF5052 NRC RAI Dated May 13, 2015:
By letter dated October 21, 2014 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML14302A067), Luminant Generation Company LLC (the licensee) submitted Refueling Outage 2RF14 Steam Generator Tube Inspection 180 day report for Comanche Peak Nuclear Power Plant, Unit 2 for the U.S. Nuclear Regulatory Commission (NRC) staff review. By letter dated April 16, 2015 (ADAMS Accession No. ML15114A198), the licensee provided response to Request for Additional Information (RAI) dated March 17, 2015. Response to RAI No. 4 states:
"Yes, all tubes with prior indications were inspected. Table 3A (page 4 of this attachment) provides the total number of AVB wear indications found since the first primary side inspection outage for Unit 2. The new AVB wear indications are only derived from the sampling program during RFO 14."
However, Table 3A referred in the RAI response was not provided as part of the response. Please clarify if the licensee intended to include Table 3A in its response dated April 16, 2015. If so, when you state that Table 3A has wear indications found since the first primary side inspection, do you mean only those that are currently in service?
NRC RAI question No. 4 from the March 17, 2015 RAI:
- 4. Table 3A of the Enclosure provides the number of anti-vibration bar (AVB) wear indications detected. Were all tubes with prior indications inspected (i.e., do the values in Table 3A provide the total number of AVB wear indications or just a subset of the total since a sampling program was implemented during RFO 14)?
Luminant Power Revised Response:
Yes, all tubes with prior indications were inspected. Table 3A provides the total number of AVB wear indications found since the first primary side inspection outage for Unit 2 including tubes with AVB wear indications that have been plugged. The new AVB wear indications are only derived from the sampling program during RFO 14.
Table 3A: Summary of AVB Wear Indications in 2RF14 SG1 SG2 SG3 SG4 Total Number of AVB Indications 185 50 58 36 329 Maximum Depth, % TW 38 40 31 24 40 Number of 'New' Indications 25 8
5 14 52 Number of > 20% TW "New" Indications 1
0 0
0 1
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