ML19290E853
| ML19290E853 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/04/1980 |
| From: | Dunenfeld M Office of Nuclear Reactor Regulation |
| To: | Kniel K Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003170155 | |
| Download: ML19290E853 (8) | |
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%,,e,j,-fl FEB 4 1980 MEMORANDUM FOR: Karl Kniel Chief Core Performance Branch, DSS THRU:
Daniel Fieno, Leader Af Reactor Physics Section, CPB/ DSS FROM:
Marvin Dunenfeld Reactor Physics Section, CPB/ DSS
SUBJECT:
MEETING WITH BNL ON JANUARY 29, 1980 ON PHYSICS TECHNICAL ASSISTANCE M. Dunenfeld visited BNL on January 29, 1980 to discuss progress on the Physics Technical Assistance program. Discussions were held with D. Diamond and M. Levine in attendance, with M. Todosow, L. Eisenhart, A. Aronson, D. Cokinos, J. Carew, and S. Cheng also in attendance as appropriate. A detailed outline of the topics discussed is enclosed.
Also discussed (with L. Eisenhart present) was the flux tilt observed in North Anna 1 at the beginning of Cycle 2.
This tilt is interesting in that VEPCO attributes it to a flow imbalance.
It appears this would be a good starting point for the tilt analysis task scheduled for this year. A decision will probably be made at the next meeting when data on the power ascension characteristics of the tilt should be available.
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% Mary Dunenfeld l
Reactor Physics Section Core Perfomance Branch Division of Systems Safety
Enclosure:
As stated e
G 8003170 ${
R0D Dr.0P ACCIDENT CALCULATION WITH BNL-TWIGL Current Status Additional work on this project has been completed. The draft report has been rewritten. Additional work beyond the first extension has been re-quested.
It is for a case with 100*F inlet subcooling.
Recent Prooress 1.
The report on the rod drop accident has been typed up.
2.
The additional work requested is in progress.
Future Plans 1.
Complete the calculation of the additional case.
2.
Revise and issue the final report.
BNL-TWIGL IMPROVEPENTS Current Status BNL-TWIGL is in production status. The neutronic model is in good shape.
The thermal-hydraulic codel needs a detailed documentation and improvements in some areas.
Recent Progress 1.
A draft report entitled "The Thermal-Hydrulic Model of BNL-TWIGL" was written and is being reviewed.
2.
A more accurate correlation for the liquid thermal conductivity of pressurized water was incorporated in place of the old car' elation.
3.
A bug concerning scram simulation was discovered and is being corrected.
Future Plans 1.
Issue the report on the thermal-hydraulic model of BNL-TWIGL.
2.
Improve the transient heat conduction and hydraulic models.
3.
Improve input / output routines.
4.
Put in equilibrium Xe and Sm.
PWR POWER DISTRIBUTION CONTROL Current Status /Recent Progress 1.
Draft of memo documenting E0CI DWARF model under review.
2.
The following load follow calculations have been completed using W CAOC procedu:es starting from an AR0, full power critical, equiliEr-ium xenon distribution at E0CI a.
(100-50-100) [3-6-3-12 ;
t=0.5 hrs.]
- Manual, Automatic Min B Control; T
=72 hrs.
max
- Automatic Center Control; Tmax=59 hrs.
b.
(100-70-100)[1.8-8.4-1.8-12; t= 0.45 A.53 hrs.]
- Automatic Center
- automatic Min B c.
(100-30-100)[4.2.3.6-4.2-12 hrs ; t=0.45-0.53 hrs.]
- Automatic Center
- Automatic Min B 3.
No values of Fg exceeding the 2.32 limit have been encountered.
Max (z)fp0Eq(z) have resulted in some points 4.
Comparisons of F0 near the top of the core Being above the Exxon bounding V(z) curve.
Future Plans 1.
Repeat some calculations starting from Bank-D inserted 200/228 steps equilibrium xenon distribution 2.
Attempt to mock-up Exxon + A0(full)/-A0(reduced) bounding load follow analysis.
MONTE CARLO Current Status /Recent Progress 1.
Have decided to pursue implementation of both SAM-CE and RCP capabilities 2.
Have obtained cross section processing codes (fLANG II, ETOT, ETOM) and will attempt to get them anerational 3.
RCPLI and RCPOI on order 4.
Memc documenting reasons for pursuing both codes in preparation
Future Plans 1.
Generate libraries for RCP and SAM for LWR problem 2.
Calculate prototypical LWR proble.m using RCP and SAM
PREPARATION OF DATA SETS I.
APPLICATION OF ARMP TO QUAD CITIES 1 Recent Progress 1.
TIP program developed 2.
Albedoes for N0DE-B established 3.
BOL simulation 4.
See attached sample results Current Status 1.
Input data for Cycle 1 nearing completion 2.
N0DE-B production runs underway 3.
Comparisons at selected exposures 4.
Completion targeted for 1/31/80 (computer permitting)
Future Plans 1.
Test haling capability of N0DE-B 2.
Test SIMULATE, CASMO, NORGE II. CROSS SECTION PROCESSING PROGRAM Current Status Written program and awaiting final verification Recent Progress 1.
Program the algorithm to collapse to any small fixed number of compositions for BNL-TWIGL, RAMONA-III, or MEKIN 2
Preparing report o.1 the method Future Plans 1.
Verify methodology by using N0DE-B Quad Cities study data 2.
Expand to utilize CASMO and SIMULATE input 3.
Long range - consider fuel type data-bank system
III. CASM0/ SIMULATE WORK Current Status /Recent Progress SIMULATE has successfully executed several sample problems which came with the code. The code runs on the CDC 6600.
CASMO has been received and has successfully executed the two sample problems which came with it.
It too runs on the CDC 6600.
Future Plans Both codes will be integrated into the BNL data preparation system.
THE MEKIN CODE int Status The BNL version of MEKIN code is in a status of limited production use.
i known errors have been debugged and most major model deficiencies have
- . n corrected.
e lecent Progress 1.
A draft report entitled "BNL-MEKIN: The BNL Version of MEKIN Code" was written.
2.
Another report entitled "The Use of BNL-MEKIN for LWR Transient Calculation" is being prepared.
3.
The problems with reactivity edit calculations were discovered and corrected.
4.
A BWR rod drop accident is being recalculated by BNL-MEKIN, using temperature dependent specific heat and thermal conductivity.
5.
The post processor plotting program has been put into service.
Future Plans 1.
Complete and issue the reports concerning BNL-MEKIN.
2.
Complete the BWR rod drop accident analysis.