ML15076A372
| ML15076A372 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/17/2015 |
| From: | Balwant Singal Plant Licensing Branch IV |
| To: | Hope T Luminant Generation Co |
| References | |
| TAC MF5052 | |
| Download: ML15076A372 (3) | |
Text
1 NRR-PMDAPEm Resource From:
Singal, Balwant Sent:
Tuesday, March 17, 2015 11:20 AM To:
'Hope, Timothy' (Timothy.Hope@luminant.com)
Cc:
Barnette, James (James.Barnette@luminant.com)
Subject:
Request for Additional Information - Unit 2 Steam Generator Tube Inspection Report (TAC No. MF5052)
- Tim, 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.
In order to complete its review, the NRC staff requests the following additional information:
- 1. For the seven tubes showing strong evidence of high residual stress, please discuss the following:
- a. Were these tubes low row or high row -2 sigma tubes, or was there some other indicator of the high residual stress?
- b. Has an analysis of all tubes in all four SGs been performed to identify all tubes with the potential of high residual stress?
- c. Are there any tubes with potentially elevated residual stress (low row offset, -2 sigma tubes) in service. If so, how many?
- 2. Under Table 3D on page 14 of 25 of the Enclosure, a note mentions legacy indications being shown in blue/italic font, but none are shown in the table. Please confirm whether or not Table 3D does, in fact, include any legacy indications. If not, please include them in your response.
- 3. Please discuss the results of your tube plug inspections. Were all plugs present and in their proper locations? Was any degradation observed?
- 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)?
Draft Request for Additional Information (RAI) was transmitted to you by e-mail dated March 10, 2015. Mr.
James Barnette of your staff informed us on March 17, 2015 that a clarification is not needed. Please treat this e-mail as formal transmittal of RAIs and you are requested to provide your response within 30 days from the date of this e-mail.
Thanks.
Balwant K. Singal Senior Project Manager (Comanche Peak and Palo Verde)
Nuclear Regulatory Commission Division of Operating Reactor Licensing Balwant.Singal@nrc.gov Tel: (301) 415-3016
2 Fax: (301) 415-1222
Hearing Identifier:
NRR_PMDA Email Number:
1938 Mail Envelope Properties (3F8C43DFB4C0234AAF556F5CBE0BCAF50149E8F22ADC)
Subject:
Request for Additional Information - Unit 2 Steam Generator Tube Inspection Report (TAC No. MF5052)
Sent Date:
3/17/2015 11:19:49 AM Received Date:
3/17/2015 11:19:00 AM From:
Singal, Balwant Created By:
Balwant.Singal@nrc.gov Recipients:
"Barnette, James (James.Barnette@luminant.com)" <James.Barnette@luminant.com>
Tracking Status: None
"'Hope, Timothy' (Timothy.Hope@luminant.com)" <Timothy.Hope@luminant.com>
Tracking Status: None Post Office:
HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 2378 3/17/2015 11:19:00 AM Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
ZZZ