ML20132B642
| ML20132B642 | |
| Person / Time | |
|---|---|
| Site: | 05200003 |
| Issue date: | 12/16/1996 |
| From: | Joseph Sebrosky NRC (Affiliation Not Assigned) |
| To: | Liparulo N WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| References | |
| NUDOCS 9612170324 | |
| Download: ML20132B642 (2) | |
Text
- _ _. - _.
4 December 16, 1996 Mr. Nicholas J. Liparulo, Manager e
Nuclear Safety and Regulatory Analysis-j Nuclear and Advanced Technology Division Westinghouse Electric Corporation i
P.O.-Box 355 Pittsburgh, Pennsylvania 15230 4
l l
SUBJECT:
CLARIFICATION OF AP600 DRAFT SAFETY EVALUATION REPORT (DSER) OPEN
}
ITEM 19.1.3.1-9, WESTINGHOUSE SHOULD VERIFY THAT THE PROBABILISTIC RISK ASSESSMENT (PRA) MODELS ARE REPRESENTATIVE OF THE AP600 DESIGN
Dear Mr. Liparulo:
l-During recent discussions concerning DSER Open Item 19.1.3.1-9 there has been
{
confusion between the staff's position and the position of Westinghouse..
t To avoid further confusion the staff wants to clarify that DSER Open i
j Item'19.1.3.1-9 applies to all AP600 PRA areas (i.e., full power internal and external events and shutdown internal and external events). The staff's i
review of the AP600 PRA indicated that the shutdown PRA was not updated to i
include risk significant design changes such as the In-containment Refueling Water Storage Tank squib valves. Thus, the dominant shutdown cutsets and shutdown importance analyses, which are necessary to derive risk results, are outdated.
l Therefore, in order to close DSER Open Item 19.1.3.1-9 and finish the AP600 i
Final Safety Evaluation Report, the staff requests Westinghouse to provide, as appropriate: a revised list of cutsets, a revised list of accident sequences, revised importance analyses, and documentation clarifying other PRA informa-tion that has been impacted by risk significant design changes (e.g., fault tree data summaries).
If you have any questions regarding this matter, you
]
may contact me at (301) 415-1132.
1' Sincerely, original. signed b Joseph M. Sebrosky,y: Project Manager Standardization Project Directorate Division of Reactor Program Management Office of Nuclear Reactor Regulation Docket No.52-003 cc:
See next page DISTRIBUTION:
i ocket File PDST R/F TMartin g
D PUBLIC DMatthews TRQuay 0
TKenyon BHuffman JSebrosky DJackson JMoore, 0-15 B18 WDean, 0-17 G21 i
d3 ACRS (11)
JFlack, 0-10 E4 170077 DOCUMENT NAME: A:DSER PRA.CLR Ts seceive a sepy of thle alesusnesst, na in the ben: *C* = Copy without attachrnen)4nctosure "E* = Copy w6th ettschment/ enclosure
- N* = No copy
)
0FFICE PM:PDST:DRPM SC:SPSB:$SSA l D:f$$JiDRPM l
NAME JSebrosky:sg j7F JF14cih W )
TR$ day 157 DATE 12/[y/96
\\
12//ff96' 12/gj/96f AFFICIAL RECORD COPY 9612170024 961216-a e
'" 8J M RE N WY
Mr. Nicholas J. Liparulo Docket No. 52 003 Westinghouse Electric Corporation AP600 i
cc: Mr. B. A. McIntyre Mr. Ronald Simard, Director i
Advanced Plant Safety & i.! censing Advanced Reactor Programs Westinghouse Electric Corr. oration Nuclear Energy Institute Energy Systems Business bnit 1776 Eye Street, N.W.
i P.O. Box 355 Suite 300 l
Pittsburgh, PA 15230 Washington,:DC 20006-3706 1
i Mr. John C. Butler 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 4
Box 355 Pittsburgh, PA 15230 Mr. James E. Quinn, Projects Manager LMR and SBWR Programs Mr. M. D. Beaumont GE Nuclear Energy i
Nuclear and Advanced Technology Division 175 Curtner Avenue, M/C 16F Westinghouse Electric Corporation San Jose, CA 95125 One Montrose Metro 4
11921 Rockville Pike Mr. Robert H. Buchholz Suite 350 GE Nuclear Energy j
Rockville, MD 20852 175 Curtner Avenue, MC-781 San Jose, CA 95125 i
Mr. Sterling Franks U.S. Department of Energy Barton Z. Cowan, Esq.
NE-50 Eckert Seamans Cherin & Mellott 19901 Germantown Road 600 Grant Street 42nd Floor j
Germantown, MD 20874 Pittsburgh, PA 15219 l
Mr. S. M. Modro Mr. Ed Rodwell, Manager Nuclear Systems Analysis Technologies PWR Design Certification Lockheed Idaho Technologies Company Electric Power Research Institute Post Office Box 1625 3412 Hillview Avenue Idaho Falls, ID 83415 Palo Alto, CA 94303 i
Mr. Frank A. Ross Mr. Charles Thompson, Nuclear Engineer l
U.S. Department of Energy, NE-42 AP600 Certification Office of LWR Safety and Technology NE-50 19901 Germantown Road 19901 Germantown Road Germantown, MD 20874 Germantown, MD 20874