ML20203E093
| ML20203E093 | |
| Person / Time | |
|---|---|
| Site: | 05200003 |
| Issue date: | 12/10/1997 |
| From: | Huffman W NRC (Affiliation Not Assigned) |
| To: | Liparulo N WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| References | |
| NUDOCS 9712160381 | |
| Download: ML20203E093 (3) | |
Text
._ ___- - _ _ _
g December 10, 1997 Mr. Nicholas J. Liparuto, Manager Nuclear Safety and Regulatory Analysis Nuclear and Advanced Technology Division Westinghouse Electric Corporation P.O. Box 355 Pittsburgh, PA 15230
SUBJECT:
OPEN ITEM ASSOCIATED WITH THE AP600 SAFETY EVALUATION REPORT (SER) ON THE VALIDATION OF WCOBRA/ TRAC FOR LONG TERM COOLING ANALYSES
Dear Mr. Liparulo:
The Reactor Systems Branch of the U.S. Nuclear Regulatory Commission has provided an SER input to the Standardization Project Directorate on the validation of the WCOBRA/ TRAC computer code for long term cooling analyses of the AP600 following loss-of-coolant accidents.
The SER will be included as part of Final Safety Evaluation Report (FSER) Chapter 21. The input has an open item on application restrictions which has been extracted anc' designated as an FSER open item in the enclosure to this letter, if you have any questions regarding this matter, you may contact me at (301) 4151141.
Sincerely, original signed by:
William C. Huffman, Project Manager Standardization Project Directorate Division of Reactor Program Management Office of Nuclear Reactor Regulation Docket No.52-003
Enclosure:
As stated cc w/enet: See next page ll DISTRIBUTION:
Docket File PDST R/F TQuay PUBLIC TKenyon WHuffman JSebrosky DScaletti JNWilson g
g ACRS (11)
WDean,0-5 E23 JMoore,0-15 B18 LLois, O-8 E23 RCaruso, O-8 E23 TCollins,0-8 E23 SNewberry,0-8 E2 GHolahan,0-8 E2 m.. [ ~ ~ ~ %,
,j; DOCUMENT NAME: A:WCT-LTC.OI
~ ~ '
To receive a copy of this document, indicate in the box: "C" = Cppy without attachment / enclosure "E" = Copy with attachment / enclosure "N" = No copy
/\\L1 OFFICE PM:PDST:DRPM l BC:SRXB:DSSA l Al D:PQST:$ RPM l
NAME WCHuffman:{q m TCollins -/5-TRoday lDATE 12/9 /97
~
19_//a /97 12/g '/9,7 OFFICIAL RECORD COPY 9712160381 971210 PDR ADOCK 05200003 (P D
w_,m,,,
7---
l Mr. Nicholas J. Liparuto Docket No.52-003 Westinghouse Electric Corporation AP600 cc:
Mr. D. A. McIntyre Mr. Russ Bell Advanced Plant Safety & Ucensing Senior Project Manager, Programs Westinghouse Electric Corporation Nuclear Energy institute Energy Systems Business Unit 1776 i Street, NW P.O.13ox 355 Suite 300 Pittsburgh, PA 15230 Washington, DC 20006-3706 Ms. Cindy L. Haag Ms Lynn Connor Advanced Plant Safety & Licensing Doc-Search Associates Westinghouse Electric Corporation Post Office Box 34 Energy Systems Business Unit Cabin John, MD 20818 Box 355 Pittsburgh, oA 15230 Dr. Craig D. Sawyer, Manager Advanced Reactor Programs Mr. Sterling Franks GE Nuclear Energy U.S. Dopartment of Energy 170 Curtner Avenue, MC-754 NE-5f; San Joso, CA 95125 19901 Germantown Road Germantown, MD 20874 Mr. Robert H. Buchhotz GE Nuclear Energy Mr. Frank A. Ross 175 Curtner Avonue, MC-781 U.S. Department of Energy, NE-42 San Jose, CA 95125 Office of LWR Safety and Technology 19901 Germantown Road Ba ton Z. Cowan, Esq.
Germantown, MD 20874 Eckert Seamans Cherin & Mellott 600 Grant Street 42nd Floor Mr. Charles Thompson, Nuclear Engirieer Pittsburgh, PA 15219 AP600 Certification NE 50 Mr. Ed Rodwell, Manager 19901 Germantown Road PWR Design Certification Germantown, MD 20874 Electric Power Research Institute 3412 Hillview Avenue Palo Alto, CA 94303
_----- - - - - - - - - - - - - ----^--~--^~~- ~ ~ - - - ' ' ' ' --
SER OPEN ITEM ON RESTRICTIONS ASSOCIATED WITH THE APPLICATION OF WCOBRA/ TRAC TO AP600 LONG TERM COOLING ANALYSES 440,762F The following application restrictions on using WCOBRATTRAC for AP600 long term cooling analyses should be clearly documented in both WCAP-14776, %' COBRA / TRAC, OSU Long.
Term Cooiing Final Validation Report," and the AP600 SSAR.
1.
The nodalization of the AP600 LTC model should be as close as possible.o that used in the OSU calculations for all future anak ses. The applicant should fully explain and justify
/
all depaitures from ths nodalization scheme used in the OSU cJculation*
2.
The time span und for any window analyses should result into a quasi-steady state solution.
3.
The WCOBRA/ TRAC cooe should not be applied outside of the corresponding parameter range from the OSU experiments. In particular, WCOBRA/ TRAC has not been validated for core dryout and heatup phenomena during LTC.
Enc;;sure
__