ML16098A013
| ML16098A013 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 04/14/2016 |
| From: | Stephen Koenick Plant Licensing Branch IV |
| To: | |
| Martin R | |
| References | |
| CAC MC4727, CAC MF4728 | |
| Download: ML16098A013 (4) | |
Text
LICENSEE:
Southern Nuclear Operating Company (SNC)
FACILITY:
Vogtle Electric Generating Plant, Units 1 and 2 (VEGP)
SUBJECT:
SUMMARY
OF MARCH 2, 2016, TELECONFERENCE WITH SNC ON GSl-191 PROGRAM FOR THE VEGP (CAC NOS. MC4727 AND MC4728)
On March 2, 2016, a Category 1 public teleconference was held between the U.S. Nuclear Regulatory Commission (NRC) and SNC representatives. The licensee's objectives in the teleconference were to discuss questions from the November 5, 2015 public meeting on their risk-informed approach to addressing Generic Safety Issue (GSl)-191, "Assessment of Debris Accumulation on Pressurize-Water Reactor Sump Performance," related to chemical effects.
The teleconference notice and agenda, dated February 11, 2016, is available in the Agencywide Documents Access and Management System (ADAMS) Accession No. ML16042A125. A list of participants is provided as Enclosure 1. The SNC presentation is also available in ADAMS Accession No. ML16056A412.
SNC addressed the following topics:
pH Values used for Release and Solubility; Calcium Release Rate vs. pH; Implementation of the Howe et al. (UNM) Aluminum Corrosion Equations; and Use of WCAP-17788 Testing with the ANL Equations to Support Short Term Aluminum Solubility.
No regulatory decisions or commitments were made during the meeting. However, staff noted the following issues:
The licensee needs to justify using the WCAP-17788-P test results to extend the valid range of temperature and pH for the UNM aluminum release and passivation equations.
NRC staff and the licensee need to confirm the Howe paper on the UNM bench testing is on the docket.
The NRC staff questioned if the UNM aluminum corrosion data fit should focus only on data in the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> since the licensee's chemical effects approach will "force" precipitation of all dissolved aluminum after 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Given that the UNM aluminum passivation term results in an under-prediction of aluminum corrosion for high and low temperature, the staff questioned why it should have confidence that it is accurate within the intended temperature range.
The NRC staff was interested in how using a bounding aluminum solubility line (i.e.,
Howe Eq. for MINTEQ + 0.66) would compare with the current proposed approach given a conservative but smaller magnitude difference (e.g., 0.5, 0.7) between the pH assumed for dissolution and pH assumed for solubility.
One member of the public participated in the teleconference. However, no Public Meeting Feedback forms were received.
Docket Nos. 50-424 and 50-425
Enclosure:
List of Participants cc w/encl: Distribution via Listserv II
/\\ ~
o/ l Stephen Koenick, Senior Project Manager Plant Licensing Branch IV-2 and Decommissioning Transition Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
LIST OF PARTICIPANTS March 2. 2016 TELECONFERENCE WITH SNC Licensee Phil Grissom Southern Nuclear Operating Company (SNC)
Ryan Joyce SNC Tim Littleton SNC Kip Walker Enercon Services Blake Stair Enercon Services Tim Sande Enercon Services Austin Glover Enercon Services Bill Henne Enercon Services NRC Staff Stephen Koenick DORL/LPL4-2 Victor Cusumano DSS/SSIB Stephen Smith DSS/SSIB Andrea Russell DSS/SSIB Paul Klein DE/ESGB Matt Yoder DE/ESGB Gloria Kulesa DE/ESGB Other Eric Fulhage Engineering Planning and Management Brian Krysteck Engineering Planning and Management Marvin Lewis Self Enclosure One member of the public participated in the teleconference. However, no Public Meeting Feedbackforms were received.
IRA/
Stephen Koenick, Senior Project Manager Plant Licensing Branch IV-2 and Decommissioning Transition Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-424 and 50-425
Enclosure:
List of Participants cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC RidsACRS_MailCTR Resource RidsNrrDorllpl2-1 Resource RidsNrrPMVogtle Resource RidsNrrLASFigueroa Resource RidsRgn2MailCenter Resource VCusumano, NRR GKulesa, NRR PKlein, NRR SSmith, NRR MYoder, NRR ARussell, NRR RMartin, NRR JStang, NRR TWertz, NRR ADAMS A ccess1on N os.: M t'
N t' ML14296A292 M t'
S ee inQ o ice:
ee1ng ummary: ML16098A013 OFFICE DORL/LPLIV-2/PM DORL/LPLll-1/LA DE/ESGB/BC DORL/LPLI 1-1 /BC DORL/LPLIV-2/PM NAME SKoenick SFigueroa GKulesa MMarkley SKoenick DATE 4/12/2016 4/07/2016 4/13/2016 4/14/2016 4/15/2016 OFFICIAL RECORD COPY