ML20129K089

Forwards Safety Evaluation of Response to Generic Ltr 83-28, Item 4.2 Re Reactor Trip Sys Reliability.Info Acceptable

ML20129K089
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
GL-83-28, NUDOCS 8507230375
Download: ML20129K089 (3)

Text

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July 10, 1985 Docket Nos. 50-317 and 50-318 Mr. A. E. Lundvall, Jr.

Vice President - Supply Baltimore Gas & Electric Company P. O. Box 1475 Baltimore, Maryland 21203

Dear Mr. Lundvall:

We have completed our review of your responses to Item 4.2, " Reactor Trip System Reliability" of Generic Letter 83-28, " Required Actions Based on Generic Implications of Salem ATWS Events." We conclude that the information submitted in response to Item 4.2 is acceptable. Our Safety Evaluation is enclosed.

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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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

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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 i Calvert Cliffs Nuclear Power Plant

[ Mr. R. C. L. Olson, Principal Engineer Maryland Routes 2 and 4 '

Nuclear Licensing 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 4

Lusby, Marylani 20657 Resident Reactor Inspector

NRC Inspection and Enforcement Combustion Engineering, Inc.

P. O. Box 437 ATTN: Mr. R. d. 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. Magette 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 cy ,-..,y.,___,,,,,.......,_m,,,_.,r... -

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9 i-1 REQUEST FOR INFORMATION GENERIC ISSUE 77

1. Provide a detailed discussion of the equipment and floor drainge system (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.

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 (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 those conditions ' identified above and that redundant safety-related equip-ment will not be adversely affected by fluid ingress into the equipment 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 i 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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