ML15224B318
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| ML15224B318 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 08/12/2015 |
| From: | Richard Guzman Plant Licensing Branch 1 |
| To: | Craft W Dominion Nuclear Connecticut |
| Guzman R | |
| References | |
| TAC MF6084 | |
| Download: ML15224B318 (2) | |
Text
From:
Guzman, Richard To:
wanda.d.craft@dom.com
Subject:
Request for Additional Information - END OF CYCLE 16 STEAM GENERATOR TUBE INSPECTION REPORTEND OF CYCLE 16 STEAM GENERATOR TUBE INSPECTION REPORT Date:
Wednesday, August 12, 2015 11:10:47 AM
- Wanda, The NRC staff is reviewing the information provided in the subject letter dated February 9, 2015 (ADAMS Accession No. ML15050A041), and has determined that additional information is needed to complete its review. Shown below is the NRC staffs request for additional information (RAI) questions. As initially communicated to you on August 4, 2015, please provide your formal response within 30 days from the date of this message.
Please contact me if you have any questions.
- Thanks, Rich Guzman Sr. Project Manager NRR/DORL US NRC 301-415-1030 REQUEST FOR ADDITIONAL INFORMATION FALL 2014 STEAM GENERATOR INSPECTIONS MILLSTONE POWER STATION, UNIT 3 DOCKET NO. 50-423 TAC NO. MF6084 By letter dated February 9, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15050A041), Dominion Nuclear Connecticut, Inc. (the licensee), submitted information summarizing the results of the steam generator (SG) inspections performed at Millstone Power Station, Unit 3 (MPS3) during the fall 2014 refueling outage (3R16). In addition, by letter dated June 23, 2015 (ADAMS Accession No. ML15173A000), the U.S. Nuclear Regulatory Commission (NRC) staff summarized a conference call held with the licensee on October 27, 2014, regarding the ongoing SG tube inspections. In order to complete its review, the NRC staff requests the following additional information:
- 1. Please discuss the results of the secondary side inspections performed during RFO 16.
- 2. Deposit Minimization Treatment and injection of Poly Acrylic Acid were identified in the previous inspection report as two corrective actions that were to address the deposit loading on the secondary side of the SGs. Please discuss the results of these actions.
- 3. Please discuss whether any inspections were performed of the SG channel head. If so, please discuss the results.
- 4. The results of the SG inspections during 3R16 were provided in several tables of the February 9, 2015, letter. Please confirm the following total wear indication numbers are correct for the given locations:
- b. 317 anti-vibration bar (AVB) wear indications in 165 tubes in SG A
- d. 76 AVB wear indications in 39 tubes in SG C
- 5. Is there a foreign object remaining near the tube in SG A in row 59, column 60 (since the column for foreign object remaining in Table 3 is blank). If a foreign object has been left in service, please discuss the results of any evaluations performed for determining the acceptability of leaving the foreign object in service.