ML062410484

Summary of 8/16/2006 Meeting the Design of the Main Steam Isolation Valves and the Requirements in the Plant Technical Specifications on These Valves

ML062410484
Person / Time
Site:	Wolf Creek, Callaway
Issue date:	09/20/2006
From:	Donohew J NRC/NRR/ADRO/DORL/LPLIV
To:	Union Electric Co, Wolf Creek
Donohew J N, NRR/DORL, 415-1307
Shared Package
ML062410381	List: ML062410484
References
Download: ML062410484 (6)

Text

September 20, 2006 LICENSEES: Union Electric Company (UECo)

Wolf Creek Nuclear Operating Corporation (WCNOC)

FACILITIES:

Callaway Plant, Unit 1 Wolf Creek Generating Station

SUMMARY

OF AUGUST 16, 2006, MEETING WITH REPRESENTATIVES OF WOLF CREEK NUCLEAR OPERATING CORPORATION AND UNION ELECTRIC COMPANY A meeting was held on Wednesday, August 16, 2006, between the Nuclear Regulatory Commission (NRC) staff and the licensees for the Callaway Plant, Unit 1 (Callaway) and Wolf Creek Generating Station (Wolf Creek). The meeting was held at the request of the licensees for them to present the design of the main steam isolation valves (MSIVs) at their plants, and the requirements in the plant Technical Specifications (TSs) on these valves. This presentation was not part of any license amendment request submitted by the licensees to the NRC. The notice for the meeting was issued on August 4, 2006. is the list of attendees. Enclosure 2 is the meeting handout provided by the licensees; there was no handout from the NRC staff.

Each plant has four steam generators (SGs) with a main steam line from each SG to the steam line header that provides steam to the single high-pressure steam turbine. Each of these main steam lines has a single MSIV to isolate, if needed during an accident, the steam turbine from the SG. Therefore, each plant has four MSIVs. Each MSIV has two actuator trains, each of which can close the valve. Each actuator train alone is capable of closing the valve within the time frame needed for the design-basis accidents. The MSIVs are addressed in TS 3.7.2, "Main Steam Isolation Valves," for both plants.

The NRC staff is in the process of making a determination as to the effect of a single inoperable actuator train on the operability, with respect to the TSs, of the associated MSIV.

The licensees' presentations provided information germane to this determination.

The following agenda was presented by WCNOC during the first part of the meeting:

Introductions (page 1 of Enclosure 2)

Purpose of Meeting (page 2)

MSIV/Main feedwater isolation valves (MFIS) Description and Operation (pages 3 through 8)

Design Bases (pages 9 and 10)

Safety Analyses (pages 11 through 17)

TSs (pages 18 through 22)

Conclusion (pages 23 and 24)

WCNOC addressed both MSIVs and MFIVs because at Wolf Creek Generating Station these valves have two actuator trains, each of which can close the valves. In its presentation on the design bases and safety analyses of the MSIVs, WCNOC stated that (1) the design bases for the MSIVs are that no single failure can prevent any MSIV from performing its required function and (2) the safety function for the MSIVs is to close in an accident within the 5 seconds required by the accident analyses. The Wolf Creek MSIV accident analyses are different from those of Callaway in that only three of the four MSIVs are required to close for Wolf Creek, whereas all the MSIVs are required to close for Callaway.

Following WCNOC's presentation, UECo presented the information provided in its handout, which is the last four pages of Enclosure 2.

UECo's presentation addressed the following: (1) the licensee's initial efforts to address the MSIV actuator inoperability, (2) the licensee's TS interpretation, (3) MSIV actuator operability issue identified in 2005, and (4) subsequent development and current status of this issue.

The NRC staff discussed with the licensees the MSIV design at both plants, the rules and practices of the TSs, and how the existing TS 3.4.15 should be interpreted with respect to the actuator trains on these valves.

The NRC staff did not draw any conclusions about the operability of an MSIV with respect to one of the two actuator trains being out-of-service. The NRC staff completed its discussion of the licensees' presentations, and the meeting was closed.

Please direct any inquiries to me at 301-415-1307, or JND@nrc.gov.

/RA/

Jack Donohew, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos: 50-482 and 50-483

Enclosures:

1. List of Meeting Attendees

2. Licensees' Handout cc w/encls: See next page WCNOC addressed both MSIVs and MFIVs because at Wolf Creek Generating Station these valves have two actuator trains, each of which can close the valves. In its presentation on the design bases and safety analyses of the MSIVs, WCNOC stated that (1) the design bases for the MSIVs are that no single failure can prevent any MSIV from performing its required function and (2) the safety function for the MSIVs is to close in an accident within the 5 seconds required by the accident analyses. The Wolf Creek MSIV accident analyses are different from those of Callaway in that only three of the four MSIVs are required to close for Wolf Creek, whereas all the MSIVs are required to close for Callaway.

Following WCNOC's presentation, UECo presented the information provided in its handout, which is the last four pages of Enclosure 2.

UECo's presentation addressed the following: (1) the licensee's initial efforts to address the MSIV actuator inoperability, (2) the licensee's TS interpretation, (3) MSIV actuator operability issue identified in 2005, and (4) subsequent development and current status of this issue.

The NRC staff discussed with the licensees the MSIV design at both plants, the rules and practices of the TSs, and how the existing TS 3.4.15 should be interpreted with respect to the actuator trains on these valves.

The NRC staff did not draw any conclusions about the operability of an MSIV with respect to one of the two actuator trains being out-of-service. The NRC staff completed its discussion of the licensees' presentations, and the meeting was closed.

Please direct any inquiries to me at 301-415-1307, or JND@nrc.gov.

/RA/

Jack Donohew, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos: 50-482 and 50-483

Enclosures:

1. List of Meeting Attendees

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

PUBLIC CSchulten, ITSB JLamb, RIV EDO LPLIV Reading TKobetz, ITSB RidsNrrDorl (CHaney/CHolden)

MZobler, OGC RidsNrrDorlLpl4 (DTerao)

WJones, RIV RidsNrrPMJDonohew RidsAcrsAcnwMailCenter RidsNrrLAMLFeizollahi RidsOgcRp Package No.: ML062410381 ADAMS ACCESSION NO. ML062410484 Meeting Handouts: ML062280437 OFFICE LPLIV/PM LPLIV/LA ITSB/SC LPLIV/BC NAME JDonohew LFeizollahi TKobetz DTerao DATE 9/18/06 9/20/06 9/19/06 9/20/06 OFFICIAL RECORD COPY

LIST OF ATTENDEES AT MEETING OF AUGUST 16, 2006 WITH REPRESENTATIVES OF UNION ELECTRIC COMPANY AND WOLF CREEK NUCLEAR OPERATING CORPORATION NAME AFFILIATION J. Donohew NRC/NRR/LPLIV D. Terao NRC/NRR/LPIV T. Kobetz NRC/NRR/ITSB C. Schulten NRC/NRR/ITSB M. Zobler NRC/OGC W. Jones NRC/RIV S. Wideman WCNOC T. Garrett WCONC F. Laflin WCNOC G. Clarkson WCNOC D. Shafer UEC T. Elwood UEC M. Reidmeyer UEC E. Hiruo Platts Nuclear Publications Where:

ITSB

= Technical Specification Branch LPLIV

= Plant Licensing Branch IV NRC

= Nuclear Regulatory Commission NRR

= Office of Nuclear Reactor Regulation OGC

= Office of the General Counsel RIV

= Region IV UECo

= Union Electric Company WCNOC = Wolf Creek Nuclear Operating Corporation

LICENSEES' HANDOUT FOR AUGUST 16, 2006, MEETING The licensees' handout (ADAMS* Accession No. ML062280437) consists of the following:

1.

Handout (24 pages) by Wolf Creek Nuclear Operating Corporation (WCNOC) 2.

Handout (4 pages) by Union Electric Company (UECo)

= Agencywide Documents Access and Management System

Callaway Plant, Unit 1 cc:

Professional Nuclear Consulting, Inc.

19041 Raines Drive Derwood, MD 20855 John ONeill, Esq.

Pillsbury Winthrop Shaw Pittman LLP 2300 N. Street, N.W.

Washington, D.C. 20037 Mr. Keith A. Mills, Supervising Engineer Regional Regulatory Affairs/Safety Analysis AmerenUE P.O. Box 620 Fulton, MO 65251 U.S. Nuclear Regulatory Commission Resident Inspector Office 8201 NRC Road Steedman, MO 65077-1302 Mr. Les H. Kanuckel Manager, Quality Assurance AmerenUE P.O. Box 620 Fulton, MO 65251 Missouri Public Service Commission Governor Office Building 200 Madison Street Jefferson City, MO 65102-0360 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Mr. H. Floyd Gilzow Deputy Director for Policy Missouri Department of Natural Resources P. O. Box 176 Jefferson City, MO 65102-0176 Mr. Rick A. Muench President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation P.O. Box 411 Burlington, KA 66839 Mr. Dan I. Bolef, President Kay Drey, Representative Board of Directors Coalition for the Environment 6267 Delmar Boulevard University City, MO 63130 Mr. Lee Fritz, Presiding Commissioner Callaway County Court House 10 East Fifth Street Fulton, MO 65151 Mr. David E. Shafer Superintendent, Licensing Regulatory Affairs AmerenUE P.O. Box 66149, MC 470 St. Louis, MO 63166-6149 Mr. Keith D. Young Manager, Regulatory Affairs AmerenUE P.O. Box 620 Fulton, MO 65251 Mr. Keith G. Henke, Planner Division of Community and Public Health Office of Emergency Coordination 930 Wildwood P.O. Box 570 Jefferson City, MO 65102 Certrec Corporation 4200 South Hulen, Suite 630 Fort Worth, TX 76109 Director, Missouri State Emergency Management Agency P.O. Box 116 Jefferson City, MO 65102-0116 Mr. Charles D. Naslund Senior Vice President and Chief Nuclear Officer Union Electric Company Post Office Box 620 Fulton, MO 65251

February 2006 Wolf Creek Generating Station cc:

Jay Silberg, Esq.

Pillsbury Winthrop Shaw Pittman LLP 2300 N Street, NW Washington, D.C. 20037 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 Senior Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 311 Burlington, KS 66839 Chief Engineer, Utilities Division Kansas Corporation Commission 1500 SW Arrowhead Road Topeka, KS 66604-4027 Office of the Governor State of Kansas Topeka, KS 66612 Attorney General 120 S.W. 10th Avenue, 2nd Floor Topeka, KS 66612-1597 County Clerk Coffey County Courthouse 110 South 6th Street Burlington, KS 66839 Chief, Radiation and Asbestos Control Section Kansas Department of Health and Environment Bureau of Air and Radiation 1000 SW Jackson, Suite 310 Topeka, KS 66612-1366 Vice President Operations/Plant Manager Wolf Creek Nuclear Operating Corporation P.O. Box 411 Burlington, KS 66839 Supervisor Licensing Wolf Creek Nuclear Operating Corporation P.O. Box 411 Burlington, KS 66839 U.S. Nuclear Regulatory Commission Resident Inspectors Office/Callaway Plant 8201 NRC Road Steedman, MO 65077-1032 Mr. Rick A. Muench President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office Box 411 Burlington, KS 66839