ML20067B746

Provides Revised Response to RAI 900.32 Re Sbwr Design

ML20067B746
Person / Time
Site:	05200004
Issue date:	02/14/1994
From:	Leatherman J GENERAL ELECTRIC CO.
To:	Borchardt R Office of Nuclear Reactor Regulation
References
MFN-017-94, MFN-17-94, NUDOCS 9402250078
Download: ML20067B746 (2)

Text

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GE Nuclear Energy m,.-----w.-.---y-- - - - - - - - - - - ~ . ~ - - - - - - - ~ - - ~ ~ - - - - - ---- - - - -

s cm wa v a z ca wn February 14,1994 MFN No. 017-94 Docket STN 52-004 L

Document Control Desk U.S. Nuclear Regulatory Commission Washington DC 20555 Attention: Richard W. Borchardt, Director Standardization Project Directorate l

l

Subject:

NRC Requests for Additional Information (RAls) on the Simplified Boiling Water Reactor (SBWR) Design

Reference:

1. Transmittal of Requests for AdditionalInformation (RAls) for the SBWR Design, Letter from M. Malloy to P. W. Marriott dated

! September 15,1994.

l l 2. MFN No. 005-94, Same Subject, J. E. Leatherman to R. W. Borchardt, l January 17,1994 l

l In Reference 1, the NRC asked question RAI 900.32 based on the PANTHERS Test Specification. GE responded to RAI 900.32 in Reference 2. The "as-built" test configuration of the facility is, however, somewhat different (exceptions) from that described in the PANTHERS Test Specification with regards to this RAI. Therefore, GE hereby provides a revised response to RAI 900.32 which is the appropriate response considering the exceptions taken to the PANTHERS Test Specification and the "as-built" facility.

l. Sincerely, -

(' G.

i (' , f)[/ &rt, T J. E. Leatherman SBWR Certification Manager MC-781, (408)925-2023 cc: M. Malloy, Project Manager (NRC) (2 attachments)'

F. W. Hasselberg, Project Manager (NRC) (1 attachment) 181121

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-9402250078 940214 l ADOCK 0520 4

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R AI. Number: 900.32

. GE Revised Response It was necessary to limit the number of tubes instrumented with wall temperature sensors to five for several reasons. Given this constraint on the number of tubes, the locations of the instrumented tubes within the tube bundic were selected to represent the various external now conditions which may be ef fected by adjacent tubes.  !

The conditions represented can be described as follows:

i TUIlE LOCATION REPRESENTING:

A1 Corner tube, adjacent to only two other tubes.

A5 End of the header, adjacent to three tubes.

R1 Inside edge of header, adjacent to four tubes.

R8 Outside edge of header, similar to R1 but flow pattern possibly different due to pool wall.

R5 Center of the bundle, adjacent to six tubes.

'l it should be recognized that an exception to the GE Test Specification has been made for the above wall temperature measurement locations for the  :

PCC Condenser provided for the PANTilERS test program. The exception has been reviewed and accepted by GE. The as-built locations of the tubes instrumented with inside and outside wall thermocouples differ from the Test Specifications as follows:

A1: No change.  :

A5: Changed to A4. The Location is adjacent to A5, so external flow conditions are similar. The changes was made to avoid-  ;

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excessive instrumentation on tube A5, which has strain gages (and associated thermocouples) and accelerometers.

R1: Deleted thermocouples on this tube. The thermocouples on R 1 '

were deleted to reduce the overall number of channels required for the Data Aquisition System (DAS). Since the  ;

location of R1 and R8 are similer, no significantly different l' data will be lost.

R8 Changed to Q8. Tube R8 has a pressure tap, which could interfere with the temperature measurements. The location of Q8 is adjacent to R8 and also in the outside row of tubes.

There is no reason to expect a significantly different temperature distribution for the two locations.  ;

R5: Changed to Q5. Moved for the same reason as R8.

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