ML20155B623
| ML20155B623 | |
| Person / Time | |
|---|---|
| Issue date: | 06/01/1988 |
| From: | Vissing G Office of Nuclear Reactor Regulation |
| To: | Scherer A ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY |
| References | |
| PROJECT-675A NUDOCS 8806130263 | |
| Download: ML20155B623 (4) | |
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l June 1, 1988 Project No. 675 Mr. A. E. Scherer, Director Nuclear Licensing Combustion Engineering-1000 Prospect Hill Road Post Office Box 500 Windsor, Connecticut 06095-0500
Dear Mr. Scherer:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION CONCERNING CHAPTERS 1 AND 5, AMENDMENT B, CESSAR-DC SYSTEM 80+ DESIGN, REACTOR SAFEGUARDS BRANCH 2
Our Reactor Safeguards Branch has reviewed the Amendment B, Chapters 1 and 5 of the System 80+ CESSAR-DC, transmitted by your letter dated April 11, 1988 and has identified the need for additional information. The enclosed Request for Additional Information describes the needed information.
Our schedule calls for the information to be received within 90 days from the date 1
i of this letter.
Sincerely, original signed by Guy S. Vissing, Project Manager Standardization and Non-Power 8806130263 880601 Reactor Project Directorate
$g Division of Reactor Projects - III, IV, PROJ PDR V and Special Projects Office of Nuclear Reactor Regulation 1
Enclosure:
As stated cc: See next page DISTRIBUTION:
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June 1, 1988 Project No. 675 Mr. A. E. Scherer, Director Nuclear Licensing Combustion Engineering 1000 Prospect Hill Road Post Office Box 500 Windsor, Connecticut 06095-0500
Dear Mr. Scherer:
SUBJECT:
RE0 VEST FOR ADDITIONAL INFORMATION CONCERNING CHAPTERS 1 AND 5 AMENDMENT B, CESSAR-DC SYSTEM 80+ DESIGN, REACTOR SAFEGUARDS BRANCH Our Reactor Safeguards Branch has reviewed the Amendment B, Chapters 1 and 5 of the System 80+ CESSAR-DC, transmitted by your letter dated April 11, 1988 and has identified the need for additional information. The enclosed Request for Additional Information describes the needed information.
Our schedule calls for the information to be received within 90 days from the date of this letter.
Sincerely, n
Guy Vissing, Pr ect Manager Standardization and Non-Power Reactor Project Directorate Division of Reactor Projects - III, IV, Y and Special Projects Office of Nuclear Reactor Regulation
Enclosure:
As stated cc: See next page
Combustion Engineering, Inc.
Project No. 675 Advanced CESSAR cc: Mr. C. B. Brinkman, Manager Washington Nuclear Operations Combustion Engineering, Inc.
7910 Woodmont Avenue, Suite 1310 Bethesda, Maryland 20814 Dr. Michael Green Manager of Licensing Combustion Engineering 1000 Prospect Hill Road Post Office Box 500 Windsor, Connecticut 06095-0500 i
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REQUEST FOR ADDITIONAL INFORMATION CONCERNING REACTOR SAFEGUARDS BRANCH OF CHAPTERS 1 AND 5. AMENDMENT B 0F COMBUSTION ENGINEERING CESSAR-DC, SYSTEM 80+ DESIGN PROJECT NO. 675 500.4 Section 1.1.3.1 Interface Definitions:
At many current generation PWRs, protection of essential service Water systems and AC power supplies are the most demanding security system requirements.
In order to facilitate the reviews of licenses applied for under the Comission's Standardization Policy, it could be important that sabotage protection interface requirements, as appropriate for the inherent sabotage resistance features being planned for the CESSAR-DC advanced standard design, be established for these site specific systems.
Similarly, site specific requirements for security systems uninterruptible power and lighting, in-plant communications, vital area barriers, etc. might be more efficiently incorporated and avoid impacts on CESSAR design scope safety systems if considered in the standard plant design stage rather than merely as "add-ons" later on.
Although it is recognized that C-E understands and intends to incorporate these needs as their design submittals progress, the interface definition could be revised to more explicitly note that. For example, the definition could be reworded to state:
"An interface is a requirement that the site specific design have a certain standardizcd configuration necessary for assuring that a CESSAR design scope system will fulfill its safety functions, considering normal operating environments and also floods, sabotage attempts, etc."
500.5 Section 1.1.3.4 Severe Accident Policy:
In addition to the four major points of the Severe Accident Policy addressed by this section, the Severe Accident Policy includes the following statement that should be added to this section:
"The Commission also recognizes the importance of such potential centributors to severe accident risk as human performance and sabotage. The issues of both insider and outsider sabotage threats will be carefully analyzed and, to the extent practicable, will be emphasized in the design and in the operating procedures developed i
for new plants."
l 500.6 Section 5.1.4 Nuclear Steam Supply System - Balance of Plant Interface Requirements, E. Separation:
If physical separation is intended to be used to enhance the inherent sabotage resistance of the design, specific criteria should be included for the barriers and distance to be used for i
this purpose.
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