ML20029C821

Forwards non-proprietary & Proprietary Westinghouse AP600 Ltr Repts, Radiation Heat Transfer Through Fog in Pccs Air Gap, for Dec 1993.Encl Withheld (Ref 10CFR2.790)

ML20029C821
Person / Time
Site:	05200003
Issue date:	04/18/1994
From:	Liparulo N WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:	Borchardt R NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19304C018	List: ML20029C821 ML20029C823 ML20029C824
References
NTD-NRC-94-4100, NUDOCS 9404290260
Download: ML20029C821 (2)

Text

. - - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

l Westinghouse Energy Systerns Q3yg , gg gg Electric Corporation j

)

NTD-NRC-94-4100 l DCP/NRC0035 Docket No.: STN-52-003 April 18,1994 Document Control Desk U.S. Nuclear Regulatory Commission ,

Washington, D.C. 20555 ATTENTION: MR. R. W. BORCHARDT

SUBJECT:

AP600 PASSIVE CONTAINMENT COOLING SYSTEM LETTER REPORTS  ;

1 i

l 1

Dear Mr. Borchardt:

Enclosed are the following letter reports addressing phenomenological topics for the AP600 Passive Containment Cooling System (PCCS). The letter reports are intended to provide the NRC with a '

i status on ongoing activities associated with the validation activitics for the EGOTHIC computer code.

Enclosure 1 - Westinghouse AP6001xtter Report, " Radiation Heat Transfer Through Fog in the PCCS Air Gap," December,1993 Enclosure 2 - Westinghouse AP600 Letter Report, " Liquid Film Model Validation", January 1994 Enclosure 3 - Non-proprietary copy of Enclosure 1 and 2 Enclosure I documents the basis for neglecting the effect of fog on radiation heat transfer in the air gap in the AP600 PCCS analyses. The evaluation shows that neglecting the presence of fog in the air gap results in an acceptably small overestimate of the total containment heat rejection and an overprediction of the baffle temperature and heat transfer to the downcomer.

Enclosure 2 documents the analytical and experimental basis for using the Chun and Seban wavy laminar liquid film heat transfer coefficient in the WGOTHIC code for AP600 analyses. The evaluation shows that the existing test data validate the liquid film heat transfer correlation for application to over 97% of the external and 100% of the internal AP600 containment surface area.

The 3% of the external surface not within the range of applicability is shown to have an overpredicted thermal resistance, which will result in a local underprediction of containment heat transfer.

The Westinghouse Electric Corporation copyright notice, proprietary information notice, application for withholding and affidavit are attached. _

2 8 0 0 F' '

9404290260 940418 - - , 1 L/t. Gel.

0 DR ADOCK 0520 3 ff/[f /l/[C h.4 / jf{//

i l

1 NTD NRC-94-41(X)

DCP/NRC0035 April 18,1994 i This submittal contains Westinghouse proprietary information consisting of trade secrets, commercial information or financial information which we consider privileged or confidential pursuant to 10CFR2.790. Therefore, it is requested that the Westinghouse proprietary information attached herek) be handled on a confidential basis and be withheld from public disclosures.

This material is for your internal use only and may be used for the purpose for which it is submitted.

It should not be otherwise used, disclosed, duplicated, or disseminated, in whole or in part, to any other person or organization outside the Commission, the Office of Nuclear Reactor Regulation, the Office of Nuclear Regulatory Research and the necessary subcontractors that have signed a proprietary  :

non-disclosure agreement with Westinghouse without the express written approval of Westinghouse. I Correspondence with respect to the application for withholding should reference AW-94-613, and should be addressed to N. J. Liparuto, Manager of Nuclear Safety And Regulatory Activities, Westinghouse Electric Corporation, P.O. Box 355, Pittsburgh, Pennsylvania, 15230-0355.  !

Please contact Brian A. McIntyre on (412) 374-4334 if you have any questions concerning this ,

transmittal.

GrM1 N. J. Liparulo, Manager

/r I Nuclear Safety & Regulatory Activities

/nja Attachments Enclosures cc: T. Kenyon, NRC (w/o Enclosures / Attachments) )

R. Hasselberg, NRC l C. Iloxie, NRC A. Notafrancesco, NRC L Shotkin, NRC (w/o Enclosures / Attachments)

B. A. McIntyre, Westinghouse (w/o Enclosures / Attachments)

I l

164 A

- , _ . -- -- - . - , -