ML15126A303

Summary of Meeting with SNC on GSI-191 Program for the VEGP

ML15126A303
Person / Time
Site:	Vogtle
Issue date:	05/08/2015
From:	Martin R Plant Licensing Branch II
To:
Martin R
References
TAC MC4727, TAC MC4728
Download: ML15126A303 (4)

Text

LICENSEE: Southern Nuclear Operating Company (SNC)

FACILITY: Vogtle Electric Generating Plant, Units 1 and 2 (VEGP)

SUMMARY

OF NOVEMBER 6, 2014, MEETING WITH SNC ON GSl-191 PROGRAM FOR THE VEGP (TAC NOS. MC4727 AND MC4728)

On November 6, 2014, a Category 1 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and SNC representatives at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The licensee's objectives in the meeting were to provide an overview of their plans for future large scale chemical effects and strainer head loss testing, and receive any comments, concerns or feedback from NRC staff. The meeting notice and agenda, dated October 23, 2014, is available in the Agencywide Documents Access and Management System (ADAMS) at Accession No. ML14296A292. A list of attendees is provided as Enclosure 1. The licensee provided slides for its presentation (ADAMS Accession No. ML15126A256). . ~

The VEGP includes two Westinghouse four-loop pressurized water reactors with characteristics relevant to this issue as follows: 99 percent NUKON insulation; 6 cubic feet of lnteram fire barrier material; GE Stacked Disk Strainers (4 per unit) for ECCS and Containment Spray (CS) to provide 765 square feet of strainer for each of the two ECCS trains, two separate CS strainers (each with 590 square feet); and trisodium phosphate as a buffer. The licensee stated that the strainer head loss and in-vessel issues remain open for VEGP; that previous chemical effects testing provided very promising results, but were not accepted by NRC and that the licensee has elected to follow Option 2B (risk-informed resolution) of SECY-12-0093, as being piloted by the South Texas Plant.

• The licensee provided an overview of its chemical effects testing plans, summarized its previous testing, and described the University of New Mexico testing facility.

The licensee also summarized its risk-informed head loss test strategy, including activities to be performed by Enercon Services, Inc. and the Alden -Research Laboratory. The licensee summarized its head loss testing strategy as follows:

• A comprehensive test program is necessary to quantify head loss for thousands of break scenarios.

• The rule based approach is a more practical option than a full correlation or test for every break scenario.

o Simplifications of fiber type, particulate surrogate, and water chemistry are necessary to develop a practical test matrix.

• Small-scale testing may be utilized to gather a majority of the data. The rule based approach is a more praCtical option than a full correlation or test for every break scenario.

• Simplifications of fiber type, particulate surrogate, and water chemistry are necessary to develop a practical test matrix.

• Small-scale testing may be utilized to gather a majority of the data.

The NRC staff found the information provided by SNC to be a useful description of the licensee's plans for this program. No regulatory decisions or commitments were made during the meeting.

Members of the public did not participate. Public Meeting Feedback forms were not received.

/j)/)1~ .

f ~~b M~rtin, Senior Project Manager (J. ~lant Licensing Branch LPL2-1

• Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-424 and 50-425

Enclosure:

List of Attendees cc w/encl: Distribution via Listserv

LIST OF ATTENDEES November 6, 2014 MEETING WITH SNC Licensee Phil Grissom Southern Nuclear Operating Company (SNC)

Ken McElroy SNC Ryan Joyce SNC Owen Scott SNC Franchelli Febo SNC Jim Littleton SNC Kip Walker Enercon Services Blake Stair Enercon Services Tim Sande Enercon Services Edwark Glandforcj University of New Mexico (UNM)

Amir Ali UNM Kerry Howe UNM Steven Unikewicz Alion Science and Technology Janet Leavitt Alion Science and Technology NRC Staff Victor Cusumano DSS/SSIB Stephen Smith DSS/SSIB Ashley Guzetta DSS/SSIB John Stanq DSS/SSIB Gloria Kulesa DE/ESGB Paul Klein DE/ESGB Matt Yoder DE/ESGB Bob Martin DORULPL2-1 Members of the Public Maurice Dingler Wolf Creek NOC Ron Holloway Wolf Creek NOC Eric Federline MPR Associates Enclosure

Meetinq Notice ML14296A292 Meetinq Summary ML15126A303 OFFICE NRR/DORL/LPL2-1/PM N RR/DORL/LPL2-1 /LA NRR/DORL/LPL2-1 /BC NRR/DORL/LPL2-1 /PM NAME BMartin SFigueroa RPascarelli BMartin DATE 05/07/15 05/07/15 05/08/15 05/08/15