ML20216G141
| ML20216G141 | |
| Person / Time | |
|---|---|
| Site: | 05200003 |
| Issue date: | 03/09/1998 |
| From: | Joseph Sebrosky NRC (Affiliation Not Assigned) |
| To: | Liparulo N WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| References | |
| NUDOCS 9803190236 | |
| Download: ML20216G141 (3) | |
Text
'
March 9, 1998 l
Mr. Nicholas J. Liparuto, Manager Nuclear Safety and Regulatory Analysis l
Nuclear and Advanced Technology Division Westinghouse Electric Corporation i
P.O. Box 355 Pittsburgh, PA 15230 i
SUBJECT:
OPEN ITEMS ASSOCIATED WITH CHAPTER 19 OF THE AP600 SAFETY I
EVALUATION REPORT (SER) l Dear Mr. Liparulo' i
The Containment.., stems and Severe Accident Branch has provided an SER for a portion of Chapter 19. However, the input to these sections contained some open items. These open items have been extracted from the SER and can been found in the enclosure to this letter.
If you have any questions regarding this matter, you may contact me at (301) 415-1132.
Sincerely,.
l original signed by:
i Joseph M. Sebrosky, Project Manager Standardization Project Directorate Division of Reactor Program Management j
Office of Nuclear Reactor Regulation Docket No.52-003
Enclosure:
As stated M r O Q"lC N_,.___..,,-.,.. d, W.
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DOCUMENT NAME: A:\\SCSB-DRCH.RAI To receive a copy of this document, Indicate in the box: "C" = Copy without attachment / enclosure "E" = Copy with rttachment/ enclosure "N" = No copy l
OFFICE PM:PDST:DRPM l SCSB:DSSA l
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NAME JMSebrosky:sg/W RPalla 4/f TRQuay W JWRoe l
DATE 7/6 /<bV 03/ 6 /98 03/ 1/98 03Yq /98 i
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' Mr. Nicholas J. Liparulo Docket No.52-003 Westinghouse Electric Corporation AP600 cc:
Mr. -B. A. McIntyiv Mr. Russ Bell Advanced Plant Safety & Licensing Senior Project Manager, Programs WestingWse Electric Corporation Nuclear Energy institute 1
Energy Systems Business Unit 1776 I 8treet, NW P.O. Box 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, PA 15230 Dr. Craig D. Sawyer, Manager i
Advanced Reactor Programs Mr. Sterling Franks GE Nuclear Energy U.S. Department of Energy 175 Curtner Avenue, MC-754 NE-50 San Jose, CA 95125 19901 Germantown Road Germantrswn, MD 20874 Mr. Robert H. Buchholz i
GE Nuclear Energy Mr. Frank A. Ross 175 Curtner Avenue, MC-781 U.S. Department of Energy, NE-42 San Jose, CA 95125 i
Office of LWR Safety and Technology 19901 Germamown Road Barton Z. Cowan, Esq.
Germantown, MD 20874 Eckert Seamans Cherin & Mellott i
600 Grant Street 42nd Floor Mr. Charles Thompson, Nuclear Engineer Pittsburgh, PA 15219 AP600 Certification NE-50 Mr. Ed Rodwell, Manager 19901 Germantan Road PWR Design Certification Germantown, MD 20874 Electric Power Research Institute 3412 Hillview Avenue
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Mr. Robert Maiers, P.E.
Palo Alto, CA 94303 Pennsylvania Department of i
Environmental Protection Bureau of Radiation Protection Rachel Carson State Office Building P.O. Box 8469 Harrisburg, PA 17105-8469
OPEN ITEM ASSOCIATED WITH CHAPTER 19 720.465F The following concems Direct Containment Heating (DCH):
(a)
The text of PRA Appendix B indicates that the Westinghouse calculation conservatively assumed that 90 percent of the Zr was unoxidized, but Table B-2 shows 50 percent.
(b)
Table B-2 indicates that the temperature of ejected core debris was assumed to be 2478 K, which is about 300 K lower than the value used in the Nuclear Regulatory Commission DCH calculations (2800 K) found in NUREG/CR-6338.
Westinghouse needs to confirm which oxidation was used and correct the Table or text in Appendix B as applicable. In addition, Westinghouse needs to assess the impact on the peak pressure of using an oxidation fraction and debris temperature consistent with the NRC calculations found in NUREG/C'M?).
1 Enclosure
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