ML20042C488

Nonproprietary Response to Supplementary Question on Effect of Spacer Grid Design on DNBR Prediction.

ML20042C488
Person / Time
Site:	Waterford
Issue date:	02/28/1982
From:	ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY
To:
Shared Package
ML19268D102	List: ML20042C481 ML20042C488
References
NUDOCS 8203310444
Download: ML20042C488 (9)

Text

Encl. (1) to C CE-7539 RESPONSE to SUPPLEMENTARY QUESTION on EFFECT of SPACER GRID DESIGN on DNBR PREDICTION WATERFORD STEAM ELECTRIC STATION UNIT NO. 3 FEBRUARY,1982 E

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LEGAL NOTICE This report was prepared as an account of work sponsored by Combustion Engineering, Inc. Neither Combustion Engineering nor any person acting on its behalf:

a. Makes any warranty or representation, express or implied including the warranties of fitness for a particular purpose or merchantability, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process dis-closed in this report may not infringe privately owned rights; or

b. Assumes any liabilities with respect to the use of, or for damages resulting from the use of, any information, apparatus, method or process disclosed in this report.

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. QUESTICS .

Demonjtrate that the final spacer grid design has a negligible effect on MDNBRs g predicted by the Waterford 3 FSAR Thermal Margin model.

.. RESPONSE Comparative Simplified TORC (S-TORC) analytes 6.ure performed utilizing both the i FSAR and Design models. The FSAR-S-TORC codel' contains one Inconel spacer grid and 10 standard grids with loss coefficients of [ ], while the Design nodel

' has one Inconel and 9 HID-1 spacer grids with Reynolds number dependent loss coefficients. At nominal conditions, these Reynolds number dependent relationships yield loss coefficients of:

K (Inconel grid) =

K (HID-1 grid) =

3 The FSAR S-TORC model was used to iterate on power to a minimum DNBR (MDNBR) of 1.190. This heat flux was then inserted into the comparable design S-TORC-model to calculate a MDNBR. As can be seen frem Table 1 the new spacer grid design with revised loss coefficients has a negligible effect on MDNBR. {

Subsequent questions arose at NRC concerning the local coolant conditions at

- the location.af. M3NBR for the six casas in Table i and, in particular, tha slight.non-conservatism of the Design TORC Model in Case C. The local coolant conditions at the location of MDNBR are presented in Table 2 for each of the cases listed in Table 1. Plots of local DNBR, Coolant' Quality and flass Velocity vs. Axial Elevation are presented in Figures 1 through 4 for Case C. ,

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TABLE 1: Comparison of FSAP and Design S-TORC MDNBRs  !

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• FSAR i 100% of Design Peaked Design Core Flow Symmetric ** FSAR 8 Cosine Design Top ** FSAR C Peaked Design 1750 2.0951 Bottom

• FSAR 80% of Design Peaked Design D'.

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• MDNBR occurring in lower half of core

• • MDNBR occurring in u]per half of core kl_ . --_ _.,._.__...,.__._._.._._.--.-7.

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