ML20062J537
| ML20062J537 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 10/29/1993 |
| From: | Nerses V Office of Nuclear Reactor Regulation |
| To: | Mcmeekin T DUKE POWER CO. |
| References | |
| IEB-93-002, IEB-93-2, TAC-M86580, TAC-M86581, NUDOCS 9311080215 | |
| Download: ML20062J537 (3) | |
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7 UNITED STATES
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NUCLEAR REGULATORY COMMISSION l
t WASHINGTON. D.C. 20555-0001 G,,
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October 29, 1993 f
Docket Nos. 50-369 and 50-370 l
t Mr. T. C. McNeekin Vice President, McGuire Site Duke Power Company l
12700 Hagers Ferry Road Huntersville, North Carolina 28078
Dear Mr. McNeekin:
SUBJECT:
MCGUIRE UNITS 1 AND 2 - RESPONSE TO NRC BULLETIN 93-02, " DEBRIS PLUGGING OF EMERGENCY CORE COOLING SUCTION STRAINERS" (TAC NOS. M86580 AND M86581)
This letter acknowledges receipt of your responses dated June 10, 1993, and September 20, 1993 (revision to June 10, 1993 response), to NRC Bulletin 93-02 (Bulletin). The Bulletin was issued May 11, 1993, to all nuclear power l
reactor licensees.
It requested licensees to identify fibrous material in the primary containment, take any necessary compensatory measures, and remove any such material. Your response of September 20, 1993, stated that fibrous filter material, such as described in the Bulletin, was identified as being used in your containments and that actions were taken as described below.
You noted that there are six ventilation systems (VSs) inside the primary containment of Units 1 and 2.
Of these, three VSs do contain fibrous filter material. Two of these three-VSs are above the flood level for a loss-of-coolant accident (LOCAt. and there are no LOCA line breaks postulated for the area where these two VSs are located. Therefore, you do not plan to remove the fibrous filters placed in these VSs.
The one VS (the Containment Purge Ventilation System) is located in an area where a postulated LOCA from a line break could impact the filter unit housing, which contains the prefilter, high efficiency filter and high-efficiency particulate air (HEPA) filters. The housing could sustain damage from the postulated jet impingement but the replaceable filters are not in the direct impingement path and will not be affected by the line break. However, as an added assurance measure, before the startup from the current steam generator outage on Unit 1, the fibrous prefilters, which are in the front end of the filter train, will be replaced with metal prefilters, which do not contain any fibrous material, in all four filter units of the containment Purge Ventilation System. The high officiency and HEPA filters will not be-removed.
The staff understands that you plan to install the metal prefilters and reinstall the high efficiency and HEPA filters on Unit 2 during the next shutdown of sufficient length.
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Mr. T. C. McHeekin October 29, 1993 Conservatively, the prefilters, high efficiency and HEPA filters, were removed from Unit 2's containment as a condition for restart after the end of the Cycle 8 outage pending field investigations to determine the actual location of piping that can produce LOCA line breaks.
3 Based on the information you provided, we consider your actions to be complete.
Please retain any records of your actions in response to this 1
i Bulletin, as subsequent inspection activities may be conducted in regard to this issue.
l Should you have any questions, please contact me at (301) 504-1484 or the lead I
Project Manager for this issue, John B. Hickman, at (301) 504-3017.
Sincerely, Original signed by:
Victor Nerses, Project Manager Project Directorate 11-3 Division of Reactor Projects'- 1/II Office of Nuclear Reactor Regulation cc: See next page DISTRIBlFION:
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DATE 0FFICIAL RECORD COPY FILE NAME: G:\\MCGUIRE\\MCG86580.BL
es Mr. T. C. McMeekin Duke Power Company McGuire Nuclear Station cc:
Mr. A. V. Carr, Esquire Mr. Dayne H. Brown, Director Duke Power Company Department of Environmental, 422 South Church Street Health and Natural Resources Charlotte, North Carolina 28242-Division of Radiation Protection 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 Power 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, III, Esquire P. O. Box 629 Winston and Strawn 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 28201-12700 Hagers Ferry Road 1006 Huntersville, North Carolina 28078 Regional Administrator, Region II Mr. T. Richard Puryear U.S. Nuclear Regulatory Commission Nuclear Technical Services Manager 101 Marietta Street, NW. Suite 2900 Westinghouse Electric Corporation Atlanta, Georgia 30323 Power Systems Field Sales 2709 Water Ridge Parkway, Suite 430 Charlotte, North Carolina 28217 Dr. John M. Barry Mecklenberg County Department of Environmental Protection 700 N. Tryon Street Charlotte, North Carolina 28202
.