ML070330427

Summary of January 25, 2007, Meeting with Dominion Energy Kewaunee Inc., on the Licensees Amendment Request Regarding the Use of TORMIS Methodology

ML070330427
Person / Time
Site:	Kewaunee
Issue date:	02/26/2007
From:	Robert Kuntz NRC/NRR/ADRO/DORL/LPLIII-2
To:
R. Kuntz LPL3-2
Shared Package
ML070570083	List: ML070330427
References
TAC MD1194
Download: ML070330427 (5)

Text

February 26, 2007 LICENSEE:

Dominion Energy Kewaunee, Inc.

FACILITY:

Kewaunee Power Station

SUMMARY

OF JANUARY 25, 2007, MEETING WITH DOMINION ENERGY KEWAUNEE INC., ON THE LICENSEES AMENDMENT REQUEST REGARDING THE USE OF TORMIS METHODOLOGY (TAC NO. MD1194)

On January 25, 2007, a Category 1 public meeting was held between the U.S. Nuclear Regulatory Commission (NRC) and representatives of Dominion Energy Kewaunee, Inc. (the licensee) at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of the meeting was to discuss Dominions license amendment for use of the TORMIS methodology. A list of attendees is provided as Enclosure 1.

The licensee presented information (See Enclosure 2) pertaining to their license amendment request dated April 6, 2006 ((ADAMS) Accession No. ML061010151), which requested approval to use the TORMIS methodology to assess the need for tornado missile protection for the Kewaunee Power Station (KPS) emergency diesel generator (EDG) exhaust ducts and EDG fuel oil tank vent lines. The licensee presented information pertaining to the analysis contained in the original submital, as well as answers to questions the NRC staff had previously communicated to the licensee (ADAMS Accession No. ML062850056).

The licensee presented background information that led to the amendment request. The NRC staff asked the licensee how they determined possible vulnerabilities to tornado-generated missile strikes at KPS. The licensee responded by explaining that they did thorough walk-downs of the site.

The licensee presented the layout of the turbine area where the EDG exhaust duct was located as well as the EDG fuel oil storage tank vent location. The licensee explained how they shortened the EDG fuel oil storage tank vents to minimize the probability of tornado-generated missile strikes, and to make the vents more stable. The licensee then gave a background of the development and use of the TORMIS methodology, and conservatisms in their analysis.

The licensee then presented their responses to the NRC staff questions (the questions and responses are detailed in Enclosure 2) which will be submitted formally to the NRC as part of the license amendment review. The licensees response to Question 4 regarding how many missile types can be used in the TORMIS methodology was sufficient, and does not need to be included in the licensees formal response.

The NRC staff requested the licensee to provide a description of how the tumbling of missiles was accounted for in the analysis and why they used a 1 foot increase in each free surface instead of the TORMIS standard of length of the free surface divided by eight (response to Question 5). The licensee explained their modeling assumptions and agreed that the formal response would include more detail.

The licensee discussed their proposed response to Question 6 (of Enclosure 2), related to impact velocity thresholds used to calculate crush probabilities of the exposed equipment. The NRC staff explained that this approach will require detailed description of their finite element analysis and calculations of the impact velocities, which will need to be reviewed by the NRC staff.

The NRC staff asked the licensee why they assumed the Tubine Building walls are capable of providing tornado missile protection during an F1 or F2 tornado (Question 7). The NRC staff stated that this assumption would require further justification. The licensee explained the conservatisms in their turbine building analysis, and agreed to either do additional modeling, where the turbine building walls failed during F1 and F2 grade tornadoes, or provide additional information to justify why excluding F1 and F2 tornadoes is reasonable.

In addition, the licensee stated that they will provide additional information of their missile survey efforts, including standardized tables used to estimate the number of source missiles per square foot for several structures; as well as the most recent measures taken to minimize the number of potential missiles at the site.

Members of the public were in attendance. Public Meeting Feedback forms were not received.

Please direct any inquiries to me at 301-415-3733, or rfk@nrc.gov.

/RA/

Robert F. Kuntz, Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-305

Enclosures:

1. List of Attendees

2. Licensee Handout cc w/encls: See next page The licensee discussed their proposed response to Question 6 (of Enclosure 2), related to impact velocity thresholds used to calculate crush probabilities of the exposed equipment. The NRC staff explained that this approach will require detailed description of their finite element analysis and calculations of the impact velocities, which will need to be reviewed by the NRC staff.

The NRC staff asked the licensee why they assumed the Tubine Building walls are capable of providing tornado missile protection during an F1 or F2 tornado (Question 7). The NRC staff stated that this assumption would require further justification. The licensee explained the conservatisms in their turbine building analysis, and agreed to either do additional modeling, where the turbine building walls failed during F1 and F2 grade tornadoes, or provide additional information to justify why excluding F1 and F2 tornadoes is reasonable.

In addition, the licensee stated that they will provide additional information of their missile survey efforts, including standardized tables used to estimate the number of source missiles per square foot for several structures; as well as the most recent measures taken to minimize the number of potential missiles at the site.

Members of the public were in attendance. Public Meeting Feedback forms were not received.

Please direct any inquiries to me at 301-415-3733, or rfk@nrc.gov.

/RA/

Robert F. Kuntz, Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-305

Enclosures:

1. List of Attendees

2. Licensee Handout cc w/encls: See next page DISTRIBUTION:

PUBLIC LPL3-1 r/f RidsNrrDorlLple RidsNrrPMRKuntz RidsAcrsAcnwMailCenter RidsNrrLATHarris JTatum, NRR JHernandez, NRR RidsRgn3MailCenter RidsNrrDssSbpb RidsNrrPMPMilano ESmith, NRR SGardocki, NRR NGreen, NRR PLouden, RIII JRobbins, RIII FTran, RIII DPassehl, RIII RidsOgcRp RidsNrrOd TBloomer, EDO Region III ADAMS ACCESSION NOs: Pkg: ML070570083 Ltr: ML070330427 *With comments Slides: ML070570103 OFFICE NRR/LPL3-1/PM NRR/LPL3-1/LA NRR/DSS/SBPB NRR/LPL3-1/BC NAME RKuntz:ca THarris JSegala*

LRaghavan DATE 02/21/07 02/23/07 02/21/07 02/26 /07 OFFICIAL RECORD COPY Dominion Energy Kewaunee, Inc.

Meeting to discuss TORMIS LAR Thursday January 25, 2007 List of Attendees NRC R. Kuntz, NRR J. Segala, NRR J. Tatum, NRR J. Hernandez, NRR P. Milano, NRR E. Smith, NRR S. Gardocki, NRR N. Greene, NRR

• P. Louden, RIII

• J. Robbins, RIII

• F. Tran, RIII

• D. Passehl, R III Dominion Energy Kewaunee J. Bischoff B. Beck L. Armstrong D. Lehman T. Webb J. Riste L. Twisdale, Applied Research Associates (contractor to licensee)

Public S. Newman R. Bair

• via teleconfernce

Kewaunee Power Station cc:

Resident Inspectors Office U.S. Nuclear Regulatory Commission N490 Hwy 42 Kewaunee, WI 54216-9510 Regional Administrator, Region III U.S. Nuclear Regulatory Commission Suite 210 2443 Warrenville Road Lisle, IL 60532-4351 Ms. Leslie N. Hartz Dominion Energy Kewaunee, Inc.

Kewaunee Power Station N 490 Highway 42 Kewaunee, WI 54216 Mr. Chris L. Funderburk Director, Nuclear Licensing and Operations Support Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711 Mr. Thomas L. Breene Dominon Energy Kewaunee, Inc.

Kewaunee Power Station N490 Highway 42 Kewaunee, WI 54216 Ms. Lillian M. Cuoco, Esq.

Senior Counsel Dominion Resources Services, Inc.

Millstone Power Station Building 475, 5th Floor Rope Ferry Road Waterford, CT 06385