ML20133E292
| ML20133E292 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/10/1985 |
| From: | Butcher E Office of Nuclear Reactor Regulation |
| To: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8507220451 | |
| Download: ML20133E292 (3) | |
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July 10, 1985 Docket No. 50-317 Mr. A. E. Lundvall Vice President - Supply Baltimore Gas & Electric Company P. O. Box 1475 Baltimore, Maryland 21203
Dear Mr. Lundvall:
The NRC staff is in the process of developing its policy regarding " flooding of safety equipment compartments by backflow through floor drains" which we have designated as Generic Issue 77. We are contacting several utilities to seek their voluntary assistance by responding to the enclosed questions. The possibility of Baltimore Gas & Electric Company's participation in this effort was discussed with Mr. R. Ash of your staff and at that time he indicated a preliminary agreement to participate.
The purpose of this letter is to request that you review the encibsed questions and confirm your continued willingness to assist us in the resolution of this generic issue.
In order that we might develop our program schedule as soon as possible, please inform us within 30 days of receipt of this letter whether you can support the program and, if so, when you can respond to the enclosed questions.
OMB clearance is not required for this request since it is being transmitted to fewer than 10 addressees.
Sincerely,
/S/
Edward J. Butcher, Acting Chief Operating Reactors Branch No. 3 Division of Licensing
Enclosure:
As stated cc w/ enclosure:
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4 Mr. A. E. Lundvall, Jr.
Baltimore Gas & Electric Company Calvert Cliffs Nuclear Power Plant ec:
Mr. William T. Bowen, President Regional Administrator, Region I Calvert County Board of U.S. Nuclear Regulatory Commission Commissioners Office of Executive Director Prince Frederick, Maryland 20768 for Operations 631 Park Avenue D. A. Brune, Esq.
King of Prussia, Pennysivania 19406 General Counsel Baltimore Gas and Electric Company Mr. Charles B. Brinkman P. O. Box 1475 Manager - Nuclear Operations Baltimore, Maryland 21203 Combustion Engineering, Inc.
7910 Woodmont Avenue George F. Trowbridge, Esq.
Bethesda, Maryland 20814 Shaw, Pittman, Potts and Trowbridge 1800 M Street, NW Mr. J. A. Tiernan, Manager Washington, DC 20036 Nuclear Power Department Calvert Cliffs Nuclear Power Plant Mr. R. C. L. Olson, Principal Engineer Maryland Routes 2 and 4 Nuclear Litensing Analysis Unit Lusby, Maryland 20657 Baltimore Gas and Electric Company Room 922 - G&E Building Mr. R. E. Denton, General Supervisor P. O. Box 1475 Training and Technical Services Baltimore, Maryland 21203 Calvert Cliffs Nuclear Power Plant Maryland Routes 2 and 4 Lusby, Maryland 20657 Resident Reactor Inspector NRC Inspection and Enforcement Combustion Engineering, Inc.
P. O. Box 437 ATTN: Mr. R. R. Mills, Manager Lusby, Maryland 20657 Engineering Services P. O. Box 500 Mr. Leon B. Russell Windsor, Connecticut 06095 Plant Superintendent Calvert Cliffs Nuclear Power Plant Department of Natural Resources Maryland Routes 2 and 4 Energy Administration, Power Plant Lusby, Maryland 20657 Siting Program ATTN: Mr. T. Hagette Bechtel Power Corporation Tawes State Office Building ATTN: Mr. J. C. Ventura Annapolis, Maryland 21204 Calvert Cliffs Project Engineer 15740 Shady Grove Road Gaithersburg, Maryland 20877 Mr. R. M. Douglass, Manager Quality Assurance Department Baltimore Gas and Electric Company Fort Smallwood Road Complex P. O. Box 1475 Baltimore, Maryland 21203
REQUEST FOR INFORMATION GENERIC ISSUE 77 1.
Provideadetaileddiscussionoftheequipmentandfloordraingesystem(s) which serve safety-related equipment or compartments containing safety-related equipment or compartments. Include diagrams as appropriate.
As part of the discussion, describe the features which will prevent back-flow from any area into compartments containing safety-related equipment.
i This discussion should include the drainage system and any other compart-ment openings such as doors, unsealed penetrations of grating through which fluid may flow. Sources of fluid to be considered are external flooding i
(ground water seepage, surface influence from rivers, lakes and rain fall ponding) and flooding due to tank failures and pipe breaks including failure of the expansion joints in the circulating water system. The back-flowing fluids to be considered are water, steam and hot air. Confirm for
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those conditions ' identified above and that redundant safety-related equip-ment will not be adversely affected by fluid ingress into the equipment j
compartments.
2.
Describe the design basis for sizing the equipment and floor drainage systems and the means for assuring that they can effectively handle the maximum leakage flow conditions in the specific plant areas of concern housing redundant safety-related equipment.
3.
Indicate any past incidents of drainage system backflow or other concern for failure of redundant safety-related equipment that has arisen or been postulated in the past due to a fluid leak or harsh environment in safety-related equipment areas.
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