ML20149L164

Summary of 970708 AP600 Telcon Re Westinghouse Submittals Concerning Hydrogen Difussion Flames

ML20149L164
Person / Time
Site:	05200003
Issue date:	07/30/1997
From:	Joseph Sebrosky NRC (Affiliation Not Assigned)
To:	NRC (Affiliation Not Assigned)
References
NUDOCS 9707310162
Download: ML20149L164 (4)

Text

- - . ~ .- . . . - --

c%

, ** 4 UNITED STATES j

NUCLEAR REGULATORY COMMISSION t WASHINGTON, D.C. 20666-4001

% $ 90$

. July 30, 1997  !

I APPLICANT: Westinghouse Electric Corporation PROJECT: AP600

SUMMARY

OF JULY 8, 1997, AP600 TELEPHONE CONFERENCE TO HYDR 0 GEN I DIFFUSION FLAMES The subject telecon was held on July 8,1997, between members of the Nuclear Regulatory Commission (NRC) staff, and Westinghouse. The attachment is a list of the participants.

1 The purpose of the telecon was to discuss two Westinghouse submittals con- i cerning hydrogen diffusion flames. The submittals were a May 1, 1997, '

4 (NS0-NRC-97-5104) submittal that provided a revision to the diffusion flame i report, and a April 21,1997,(NSD-NRC-97-5078) submittal that provided responses to request for additional information (RAI). In the April 21, 1997,

, ~1etter Westinghouse provided a response to RAI 480.947. The staff did not understand the following statement made in the response concerning diffusion i

flames at the in-containment refueling water storage (IRWST) vents: "Due to the available flow paths for entrainment into the diffusion flame and its thermal plume it is not anticipated that the flame will attach to the wall."

i After some technical discussion, the staff stated that it could not come to  ;

i the same conclusion. Further, the staff believed that if the diffusion flame did contact the containment wall it would cause failure of the containment.

Therefore, the staff believed that the diffusion flame report did not support the assumption that the failure probability of the containment was zero if a diffusion flame were to occur at the IRWST vent.

Westinghouse stated that a sensitivity analysis was performed in the i probabilistic risk assessment (Section 50.6.2.6) which assumes containment failure from large hydrogen releases through the IRWST. The staff agreed to review this analysis. The staff also stated that it did not intend to perform a confirmatory calculation of the effects of the diffusion flame on the containment, because of the above stated position. Therefore, the staff informed Westinghouse that it no longer needed detailed design information to perform this calculation that it had requested through RAI 480.950 and the ,

staff retracted this question.

I gppV M 006.

g' ?,W M Wooo, A PDR MC WE GMM %W

July 30, 1997 A draft of this telecon summary was provided to Westinghouse to allow them the opportunity to comment on the summary prior to issuance.

OriginalSigned By:

Joseph M. Sebrosky, Project Manager Standardization Project Directorate Division of Reactor Program Management Office of Nuclear Reactor Regulation Docket No.52-003

Attachment:

As stated cc w/att: See next page DISTRIBUTION w/ attachment:

Docket File PDST R/F- TKenyon PUBLIC BHuffman DTJackson JSebrosky MSnodderly, 0-8 H7 RPalla, 0-8 H7 JKudrick, 0-8 H7 AMalliakos, T-10 K8 DISTRIBUTION w/o attachment:

SCollins/FMiraglia, 0-12 G18 TMartin, 0-12 G18 RZimmerman, 0-12 G18 MSlosson SWeiss TQuay WDean, 0-5 E23 ACRS (11) JMoore, 0-15 B18 DOCUMENT NAME: A:FLAM TEL.'. .  !

To receive a copy of this document, Wate in the bu m: 'C' s Copy without attachment /eveclosure *E" = Copy with attachment / enclosure "N" = No copy 0FFICE PM:PDST:DRPM D:PDST:DRPM l l NAME JMSebrosky:sg./ E TRQuay .<y2q DATE 07/6/97 // 07/2p/97 0FFICIAL RECORD COPY l

. l Westinghouse Electric Corporation Docket No.52-003 i

l cc: Mr. Nicholas J. Liparulo, Manager Mr. Frank A. Ross Nuclear Safety and Regulatory Analysis U.S. Department of Energy, NE-42 Nuclear and Advanced Technology Division Office of LWR Safety and Technology l Westinghouse Electric Corporation 19901 Germantown Road P.O. Box 355 Germantown, MD 20874 i Pittsburgh, PA 15230 l Mr. Ronald Simard, Director Mr. B. A. McIntyre Advanced Reactor Program Advanced Plant Safety & Licensing Nuclear Energy Institute Westinghouse Electric Corporation 1776 Eye Street, N.W. f Energy Systems Business Unit Suite 300  ;

Box 355 Washington, DC 20006-3706 Pittsburgh, PA 15230 Ms. Lynn Connor Ms. Cindy L. Haag Doc-Search Associates Advanced Plant Safety & Licensing Post Office Box 34 Westinghouse Electric Corporation Cabin John, MD 20818 Energy Systems Business Unit l Box 355 Dr. Craig D. Sawyer, Manager l Pittsburgh, PA 15230 Advanced Reactor Programs i GE Nuclear Energy 1 Mr. M. D. Beaumont 175 Curtner Avenue, MC-754 '

Nuclear and Advanced Technology Division San Jose, CA 95125 Westinghouse Electric Corporation One Montrose Metro Mr. Robert H. Buchholz  ;

11921 Rockville Pike GE Nuclear Energy Suite 350 175 Curtner Avenue, MC-781 ,

Rockville, MD 20852 San Jose, CA 95125 Mr. Sterling Franks Barton Z. Cowan, Esq.

U.S. Department of Energy Eckert Seamans Cherin & Mellott i NE-50 600 Grant Street 42nd Floor '

19901 Germantown Road Pittsburgh, PA 15219 Germantown, MD 20874 Mr. Ed Rodwell, Manager i Mr. S. M. Modro PWR Design Certification ,

Nuclear Systems Analysis Technologies Electric Power Research Institute  !

Lockheed Idaho Technologies Company 3412 Hillview Avenue Post Office Box 1625 Palo Alto, CA 94303 I Idaho Falls, ID 83415 Mr. Charles Thompson, Nuclear Engineer l AP600 Certification NE-50 19901 Germantown Road Germantown, MD 20874 l

l

I AP600 DIFFUSION FL AME TELECON PARTICIPANTS I JULY 8, 1997  !

I HAME ORGANIZATION CINDY HAAG WESTINGHOUSE i JIM SCOBEL WESTINGHOUSE TERRY SCHULZ WESTINGHOUSE ROBERT HAMMERSLY FAI WESIUN DILLUMDUCK FAI RON DYKUSIEN SANDIA NATIONAL LABORATORY MIKE SN0DDERLY NRC ASIMIOS MALLIAKOS NRC J0E SEBROSKY NRC I

i z

l i

i

Attachment