ML20210T523
| ML20210T523 | |
| Person / Time | |
|---|---|
| Site: | 05200003 |
| Issue date: | 09/10/1997 |
| From: | Mcintyre B WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | Quay T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NSD-NRC-97-003, NSD-NRC-97-3, NUDOCS 9709150180 | |
| Download: ML20210T523 (2) | |
Text
__
L
.t
?
1-s
, Westinghouse Energy Systems fu 355 Electric Corporation Pmstugh Pennsylvania 15230 0355 DCP/NRC1024 NSD-NRC-97-5315 Docket No.: 52-003 September 10,1997 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION: T. R. QUAY
SUBJECT:
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION ON CilAPTER 15.6.5 OF Tile AP600 STANDARD SAFETY ANALYSIS REPORT (RAI 440.665)
Dear Mr. Quay:
Attached is the response to a request for additional information on Chapter 15.6.5 of the AP600 Standard Safety Analysis Report. This response closes, from a Westinghouse perspectise, RAI 440.665 (OITS 5548). The Westinghouse status column in the OITS will be changed to " Action N" for the above item. The NRC should inform Westinghouse of the status to be designated in the "NRC Status" column of the OITS.
Please contact Ms. Susan V. Fanto (412)374-4028, if you have any questions concerning this material, tA A
J Brian A. McIntyre, anager
- Advanced Plant Safety and Licensing-4 jml Attachment cc: W. C.11uffman, NRC N. J. Liparuto, Westinghouse (w/o Attachment) iI h 00\\
9709150100 970910 PDR ADOCK 05200003-E PDR:
- 1. L
3 e
g NRC REQUEST FOR ADDITIONAL INFORMATION
- iv !!!j r
Question 440.665: (OITS-5548) llow lont. of a time interval is typically required from LOCA initiation to attain significant (semi steady state) flow to the IRWST from condensate return off the contaiament walls via the gutter system?
Resporm:
The time required to obtain a semi-steady state Dow ori ondensate off the containment walls during a LOCA transient is dependent on the break size. With its large mass / energy releases, the DECLG break establishes a steady flow of condensate within 30 seconds after the inception of the break. He flow remains continuous thereafter, following the mass / energy release behavior over time.
The small break LOCA cases take longer to establish a steady condensate flow off the containment walls.
For instance, for the two-inch break analyzed in support of the SSAR subsection 15.6.5.4C LOCA long-term cooling analyses, several hundred seconds are necessary for a significant flow to become established.
ne flow continues thereafter, although it is predicted by EGOTHIC to decrease after the actuation of ADS Stages 1, 2 and 3, when much of the mass / energy release is redirected to and quenched in the IRWST at the sparger. The condensate flow rate is reestablished once ADS Stage 4 is actuated later on in the transient.
s SSAR Revision:
NONE T Westinghouse
- # 8^
.