ML15224A319

Informs That NRC Reviewed Schedule for Corrective Action Submitted in Suppl Response to IE Bulletin 80-04 & Find It Acceptable Based on Listed

ML15224A319
Person / Time
Site:	Oconee
Issue date:	10/06/1993
From:	Wiens L Office of Nuclear Reactor Regulation
To:	Hampton J DUKE POWER CO.
References
IEB-80-04, IEB-80-4, TAC-M86649, TAC-M86650, TAC-M86651, NUDOCS 9310150250
Download: ML15224A319 (3)

Text

'Docket Nos. 50-269, 50-2*

October 6, 1993 and 50-287 Mr. J. W. Hampton Vice President, Oconee Site Duke Power Company P.O. Box 1439.

Seneca, South Carolina 29679

SUBJECT:

CONTAINMENT PRESSURIZATION DUE TO MAIN STEAMLINE BREAK INSIDE CONTAINMENT-SUPPLEMENT TO IEB 80 OCONEE UNITS 1, 2, AND 3 (TAC NOS. M86649, M86650, AND M86651)

Your letter dated-August 19, 1993, informed us of a conceptual design modification to address the issue of potential containment overpressurization as a result of a main steamline break (MSLB) inside containment. You stated that in response to an MSLB, the modification Would provide an automatic feedwater isolation. Although we have not performed a technical review of this design modification, the approach provides an acceptable response to address the concerns of Inspection and Enforcement Bulletin (IEB) 80-04.

The NRC staff has reviewed the schedule for corrective action submitted in the supplement response to IEB 80-04 and find it acceptable based on (1) ability to take procedural manual action to prevent exceeding containment design pressure, (2) the.low likelihood of a major main steamline break event, (3) the conservatism in the containment design, and (4) the conservatism in the main steamline break analysis.

If you have questions regarding this matter, contact me at (301) 504-1495.

Sincerely,

/s/.

Leonard A. Wiens, Project Manager Project Directorate 11-3 Division of Reactor Projects -

I/II Office of Nuclear Reactor Regulation cc:

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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20665-0001 October 6, 1993 Docket Nos. 50-269, 50-270 and 50-287 Mr. J. W. Hampton Vice President, Oconee Site Duke Power Company P.O. Box 1439 Seneca, South Carolina 29679

SUBJECT:

CONTAINMENT PRESSURIZATION DUE TO MAIN STEAMLINE BREAK INSIDE CONTAINMENT-SUPPLEMENT TO IEB 80 OCONEE UNITS 1, 2, AND 3 (TAC NOS. M86649, M86650, AND M86651)

Your letter dated August 19, 1993, informed us of a conceptual design modification to address the issue of potential containment overpressurization as a result of a main steamline break (MSLB) inside containment. You stated that in response to an MSLB, the modification would provide an automatic feedwater isolation. Although we have not performed a technical review of this design modification, the approach provides an acceptable response to address the concerns of Inspection and Enforcement Bulletin (IEB) 80-04.

The NRC staff has reviewed the schedule for corrective action submitted in the supplement response to IEB 80-04 and find it acceptable based on (1) ability to take procedural manual action to prevent exceeding containment design pressure, (2) the low likelihood of a major main steamline break event, (3) the conservatism in the containment design, and (4) the conservatism in the main steamline break analysis.

If you have questions regarding this matter, contact me at (301) 504-1495.

Sincerely, Leonard A. Wiens, Project Manager Project Directorate 11-3 Division of Reactor Projects -

I/II Office of Nuclear Reactor Regulation cc:

See next page

Mr. J. W. Hampton Duke Power Company Oconee Nuclear Station cc:

Mr. A. V. Carr, Esquire Mr. M. E. Patrick Duke Power Company Compliance 422 South Church Street Duke Power Company Charlotte, North Carolina 28242-0001 Oconee Nuclear Site P. 0. Box 1439 J. Michael McGarry, III, Esquire Seneca, South Carolina 29619 Winston and Strawn 1400 L Street, NW.

Mr. Alan R. Herdt, Chief Washington, DC 20005 Project Branch #3 U. S. Nuclear Regulatory Commission Mr. Robert B. Borsum 101 Marietta Street, NW. Suite 2900 Babcock & Wilcox Atlanta, Georgia 30323 Nuclear Power Division Suite 525 Ms. Karen E. Long 1700 Rockville Pike Assistant Attorney General Rockville, Maryland 20852 North Carolina Department of Justice Manager, LIS P. 0. Box 629 NUS Corporation Raleigh, North Carolina 27602 2650 McCormick Drive, 3rd Floor Clearwater, Florida 34619-1035 Mr. G. A. Copp Licensing -

ECO50 Senior Resident Inspector Duke Power Company U. S. Nuclear Regulatory Commission P. 0. Box 1006 Route 2, Box 610 Charlotte, North Carolina 28201-1006 Seneca, South Carolina 29678 Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, NW. Suite 2900 Atlanta, Georgia 30323 Max Batavia, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 Office of Intergovernmental Relations 116 West Jones Street Raleigh, North Carolina 27603 County Supervisor of Oconee County Walhalla, South Carolina 29621