ML20126A436

Advises That NRC Must Review Modified Tracg Computer Code for thermal-hydraulic Analyses Prior to Acceptance of Design Certification for Simplified Bwr.Initial Survey of Tracg Must Be Arranged in Jan 1993

ML20126A436
Person / Time
Site:	05200004
Issue date:	12/15/1992
From:	Poslusny C Office of Nuclear Reactor Regulation
To:	Marriott P GENERAL ELECTRIC CO.
References
NUDOCS 9212210059
Download: ML20126A436 (2)

Text

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, December 15, 1992 i t

l Docket'No. !l2-004  !

(previously Project No. 681)

Mr. Patrick W. Marriott, Manager l Licensing & Consulting Services  !

GE Nuclear Energy l 175-Curtner Avenue San Jose, California 95125 1 l

SUBJECT:

TRACG REVIEW FOR THE SIMPLIFIED BOILING WATER REACTOR (SBWR) l In support of its application for design certification of the SBWR, GE Nuclear Energy (GE) is using the TRACG computer code for thermal-hydraulic analyses.

TRALG is e /ariant of the IRAC computer code which was developed by the Office  :

of Nuclear Regulatory Research. GE has made significant modifications to the l code. However, before the staff can accept the analyses performed by GE in l support of their application, we will have to review the modified code itself.

In order to understand this code, it will be necessary for the staff and its  !

contractors to conduct detailed discussions of the design, operation, and use l of ths code with GE. These discussions will include presentations by the  !

responsible GE engineers of the theeretical bases for the code models, as well .I as actual demonstrations of the application of the code in modeling 53WR performance. In addition, as part of the review of TRACG and SBWR, we intend to perform independent calculations of the SBWR transients using TRACG, as- 1 well as other codes. We understand that TRACG-is written for'a particular

.model of computer that the Nuclear Regulatory Commission does not use, so it is likely that staff calculations will have to be run on GE computers remotely frum One White Flint North.

This level of interaction between the staff and GE is an ~ extension of existing staff requests.for additional information to review the SBWR application.

Inasmuch as the TRACG review process may be lengthy, it is important that we arrange for an initial survey of TRACG in January 1993. The acting SBWR project mar.ager, Chet Poslusny (301) 504-1132, and the technical lead, Ralph Caruso (301) 504-1813, will be coordinating this survey meeting with the GE-staff.

Sincerely, OdghafStang gy, Chester Poslusny, Project Manager Standardization Project Directorate 170087 Associate Directorate for Advanced Reactors and License Renewal 8g Office of Nuclear Reactor Regulation o.

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. 4 Mr. Patrick W. Harriott Gen,,eral Ilectric Company Docket No.52-004 cc: Mr. Robert Mitchell General Electric Company 175 Curtner Avenue San Jose, California 95114 Mr. L. Gifford, Program Manager Regulatory Programs GE Nuclear Energy 12300 Twinbrook Parkway Suite 315 Rockville, Maryland 20852 Director, Criteria & Standards Division Office of Radiation Programs U. S. Environmental Protection Agency 401 M Street, S.W.

Washington, D.C. 20460 Mr. Daniel F. Giessing l U. S. Department of Er.ergy

!- NE-42 Washington, D.C. 20585 Mr. Steve Goldberg Bu69et Examiner

. 725 17th Street, N.W.

Room 8002 Washington, D.C. 20503 f