ML19254D163
| ML19254D163 | |
| Person / Time | |
|---|---|
| Issue date: | 10/04/1979 |
| From: | Baer R Office of Nuclear Reactor Regulation |
| To: | Scherer A ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY |
| References | |
| NUDOCS 7910220456 | |
| Download: ML19254D163 (3) | |
Text
.w'"%, %,
UNITED STATES
[(Tye,yj' NUCLEAR REGULATORY COMMISSION
- u}.
p WASHINGTON, D. C. 20555 Y.
.4
%,...../
0CT 0 41979 Mr. A. E. Scherer Liceruing Manager Combustion Engineering Inc.
1000 Prospect hill Road Windsor, Connecticut 06095 Cear Mr. Scherer:
SL'BJECT:
STAFF REVIEW 0F TOPICAL REPORT CENPD-206-P In order to continue our review of topical report CE4PD-206-P, entitled
" TORC Code, Verification and Simplified Modeling Methods," we find that we need additional information. The specific information we need to complete our review is identified in the Enclosure.
We request that you inform us of your schedule for s, nitting your response within seven days of the receipt of this letter.
If you have any questiens with regard to the Enclosure, please contact us.
Sincerely, Robert L. Baer, Chief Light Water Reactors Branch #2 Division of Project Management Office of Nuclear Reactor Regulation
Enclosure:
Request for additional information 2
)9 7 9102 2 0 5-Sc
GCT 0 41919 ENCLOSURE
~
REQUEST FOR ADDITIONAL INFORMATION TOPICAL REPORT CENPD-206-P 1.
(a) Provide a figure comparing the measured and predicted 1/5-scale mcdel core outlet flow distribution using the input boundary conditions of measured ir.tet flow distribution and measured exit pressure distribution.
(b) Does the set of i'.put boundary conditions in (a) always represent the best agreement with flow model test data?
If now, how is it ensured that the set of boundary conditions giving the best agreement with flow model test data will always be used in the detailed TORC analysis?
2.
In the comparison of TORC design model results with the detailed TORC analysis (Section 4.3, page 4-3), it is stated that the core exit pressure and inlet flow distribution used in the detailed analysis were based on flow model results from the 1/5-scale vessel model. We require that the results of flow model tests applicable to each reactor configura-tion (including CESSAR System 80) be used to show that the simplified model is conservative with respect to the detailed TORC analysis.
3.
CENPD-206-? states (p. 4-3) that the inlet flow split for the TORC design model is chosen to yield appropriate CNBR predictions.
Discuss in detail the procedure for selecting the hot assembly inlet mass velocity. Are non-conservative differences between the detailed TCRC analysis and the ficw model test results compensated by the choice of flow split? Quantify the uncertainties in the TORC calculation and discuss hcw it is ensured that 2
196
~
. 00! O 4 1979
~
all uncertainties in input conditions (including code calculation un-certainties) are accorrnodated.
2 197