ML20128E116

Discusses Util Re Accident Sequences to Be Used in Three Part Plan for Resolution of Hydrogen Control Issues

ML20128E116
Person / Time
Site:	Catawba, McGuire, Mcguire
Issue date:	02/03/1993
From:	Matthews D Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
NUDOCS 9302100313
Download: ML20128E116 (4)

Text

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's . UNITED STATES E[enn e,'

NUCLEAR REGULATORY COMMISSION i $ svAsmNGTON, D, C. 20556 k . . . . . p! February 3,1993 Docket Nos. 50-369, 50-370

. 50-413, 50-414 Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power. Company -

422 South Church Street (harlotte, North Carolina 28242-0001

SUBJECT:

MCGUIRE AND CATAWBA NUCLEAR STATIONS - CONTAINMENT HYDROGEN CONTROL (TACS M63034, M63065, M63032, M63033) ,

By letter dated January 4, 1989, you submitted information regarding the accident sequences to be used in your three-aart plan-for resolution of=_

hydrogen control. issues. This plan, applica)1e to the McGuire and Catawba facilities, is described in your letter of April 25, 1986, and was endorsed by the staff in Supplement 6 of the Catawba Safety Evaluation Report (SSER-6).

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Staff approval of-the selection of accident sequences is required by 10 CFR 50.44(c)(3)(vi)(B)(3) and is an open issue from SSER-6.

The staff has reviewed the information presentad in your submittals regarding the accident sequences to be utilized. It is the position of the staff that-the accident sequences, which you have selected for Part 1 of the program, encompass an appropriate range of scenarios consistent with the~ intent of-10 CFR 50 44(c)(3)(vi)(B)(3). These-_ sequences include:

1. Si O 6-inch hot leg LOCA with ECCS failure,

2. S# D 2-inch hot leg LOCA with ECCS failure, .

3. S2 H (2-inch hot leg.LOCA with ECCS recirculation mode failure),and

4. TMLU (SB0 - Loss of main feedwater, failure of auxiliary feedwater and ECCS).

'These sequences encompass a range of low, intermediateland high pressures.

According to.the information you have provided; for each sequence, ECCS recovery is delayed until hydrogen production has peaked and hot leg breaks. -

have been chosen in order to minimize hydrogen holdup time. Also, since no.

sequences result in; clad oxidation greater than 25.2%, a non-mechanistic model' has been used to extend the hydrogen source term to 75%: clad-oxidation. You ,

indicated:the non-mechanistic model tsed to extrapolate hydrogen > production to }

75% clad oxidation was consistent with that used by the Hydrogen Control' Owner's' Group.

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l Mr. H. B. Tucker February 3, 1993 The f1RC staff requests that you submit the remainder of the information you committed to provide in accordance with your three-part plan. This will enable the staff to continue its review of the remaining SLR open issues (i.e., the effects of upper compartment burns on the operation and survivability of air return fans and ice condenser doors). This request has been discussed with P. M. Abraham of your staff, and it was agreed that Duke Power will submit the additional information within 45 days of receipt of this letter.

Sincerely, LWb David B. Matthews, Director Project Directorate 11-3 Division of Reactor Projects - 1/11 Of fice of fluclear Reactor Regulation cc: See next page

Y o

Mr. H. B. Tucker February 3, 1993 The 11RC staf f requests that you submit the remainder of the information you committed to provide in accordance with your three-part plan. This will enable the staff to continue its review of the remaining SER open issues (i.e., the effects of upper compartment burns on the operation and survivability of air return fans and ice condenser doors). This request has been discussed with P. M. Abraham of your staf f, and it was agreed that Duke Power will submit the additional information within 45 days oi receipt of this letter.

Sincerely,

/s/

David B. Matthews, Director Project Directorate 11-3 Division of Reactor Projects - /11 Office of Nuclear Reactor Regulation cc: See next page DlSIBJBUTION;.

Docket.F.ile NRC & Local PDRs PDll-3 R/f McGuire R/F Catawba R/f SVarga Glainas DMatthews RMartin Treed LBerry OGC, 15B18 ACRS (10), P-315

[Morschoff, Ril p RBarrett, SH7

• SEE PREVIOUS CONCURRENCE 1 J.

or r at PDil-3/L(h] PDil-3/PM

• PDil-3/PM BC:SCSE* 0:Ibl-3 N

L.BERRYh RMARTIN:cw TREED RBARRETT DMAllHEWS

• 3r/Y/93 l/03/93 l / df/93 0_1/12/93

,_ _. 11.3 /93 _

0FFICIAL RECORD COPY FILE NAME: G:\ CATAWBA \ TUCKER.LTR u

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I Catawba Nuclear Station Duke Power Company McGuire Nuclear Station cc:

Mr. Daync H. Brown, Director Mr. A. V, Carr, Esquire Department of Environmental, Duke Power Company Health and fiatural Resources 422 South Church Street Division of Radiation Protection Charlotte, North Carolina 28242-0001 P. O. Box 27687

. Raleigh, North Carolina 27611-7687 County Manager of Mecklenberg County 720 East fourth Street Mr. Alan R. Herdt, Chief Charlotte, North Carolina 28202 Project Branch #3 U. S. Nuclear Regulatory Commission Mr. R. O. Sharpe 101 Marietta Street, NW. Suite 2900 Compliance Atlanta, Georgia 30323 Duke Fower Company McGuire Nuclear Site Ms. Karen E. Long 12700 Hagers Ferry Road Assistant Attorney General Huntersville, NC 28078-8985 North Carolina Department of Justice J. Michael McGarry, 111, Esquire P. O. Box 629 Winston and Strawr Raleigh, North Carolina 27602 1400 L Street, NW.

Washington, DC 20005 Mr. G. A. Copp Licensing - EC050 Senior Resident Inspector Duke Power Company c/o U. S. Nuclear Regulatory P. O. Box 1006 Commission Charlotte, North Carolina 28201-1006 12700 Hagers Ferry Road Huntersville, North Carolina 28078 Regional Administrator, Region 11 U.S. Nuclear Regulatory Commission Mr. T. Richard Puryear 101 Marietta Street, NW. Suite 2900 Nuclear Technical Services Manager Atlanta, Georgia 30323 Carolinas District Westinghouse Electric Corporation North Carolina MPA-1 P. O. Box 32817 Suite 600 Charlotte, North Carolina 28232 P. O. Box 29513 Raleigh, North Carolina 2762G-0513 Dr. John M. Barry Mecklenburg County County Manager of York County Department of Environmental York County Courthouse Protection York, South Carolina 29745 700 N. Tryon Street Charlotte, North Carolina 28202 Richard P. Wilson, Esquire Assistant Attorney General Mr. R. C. Futrell South Carolina Attorney General's Regulatory Compliance Manager Office Duke Power Company P. O. Box 11549 4800 Concord Road Columbia, South Carolina 29211 York, south Carolina 29745

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Catawba Nuclear Station Duke Power Company McGuire Nuclear Station CC:

Piedmont Municipal Pcwer Agency 121 Village Drive Greer, South Carolina 29651 North Carolina Electric Membership Corporation P. O. Box 27306 Raleigh, North Carolina 27611 Senior Resident Inspector Route 2, Box 179 N York, South Carolina 29745 Mr. Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 27602 Saluda River Electric P. O. Box 929 Laurens, South Carolina 29360

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