ML20078R646

Forwards Responses to Questions from 950112 417th ACRS Meeting Re Capability of Isolation Condenser to Withstand Loadings Resulting from Tube Rupture & Issue of Mitigation of Consequences of Break in RWCU Line

ML20078R646
Person / Time
Site:	05200004
Issue date:	02/10/1995
From:	Quinn J GENERAL ELECTRIC CO.
To:	Boehnert P Advisory Committee on Reactor Safeguards, NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
MFN-017-95, MFN-17-95, NUDOCS 9502230064
Download: ML20078R646 (2)

Text

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GENuclear Energy  ;

ceeweeantcmn l 115 curtw A,<e~a Sn hse CA 95125  :

-i February 10,1995 GE-017603-95-027 l

MFN No. 017-95  !

Docket STN 52-004- l Document Control Desk i US Nuclear Regulatory Commission Washington, DC 20555 -

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Attn: Mr. Paul Boehnert  !

ACRS Staff  ;

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SUBJECT:

RESPONSES TO QUESTIONS FROM THE 1/12/95 417TH A CRS  !

MEETING Ref: E-Mail Correspondence between P. Boehnert and J. Leatherman -

February,1995 l

Dear Mr. Boehnert,

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The attachment to this letter provides GE responses to the three ACRS questions posed in the referenced correspondence. The question numbering scheme is the same as j that used in the referenced correspondence.  !

Sincerely yours, .

_p' l

Jame Quinn, Projects Manager 4

l LMR and SBWR Programs j CC: RW liasselberg )

SQ Ninh ) NRC JII Wilson )

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. -l Attachment to MFN # 017-95 l RESPONSES TO QUESTIONS FROM THE 1/12/95 417TH ACRS MEETING ~

l (Q-1) Jay Carroll raised an issues concerning the capability ofthe isolation condenser to -l withstand the loadings resultingfrom a tube rupture. Specifically, whether the l isolation valve (s) can close against the resultingflow.

l (R-1) Yes, the isolation valve design will be qualified by testing and analysis to l demonstrate that it is capable of closing against full flow and differential pressure 'i due to a rupture of the isolation condenser. The qualification will be in accordance -l with ANSI B16-41 " Functional Qualification Testing for Power Operated Active i Valve Assemblies for Nuclear Power Plants", coupled with special effects testing l and analysis for valve sizes too large to test under pipe break conditions due to (

test facility limitations.  :

i (Q-2) CarlMichelson raised the issue ofmitigation ofthe consequences ofa break in the R WCUline. He asked ifGEplans to add a " third (isolation) valve". .

t (R-2) The response to Carl Michelson's concern was provided in GE Response 165-166 i in GE/ACRS letter MFN No.149-94 dated November 23,1994. Among the I issues we will review when the design review is restarted is the ABWR " Third .

(isolation) valve" issue with regard to the SBWR RWCU line. i f

(Q-3) Jay Carroll had asked ofthe valve in the vessel drain line could be remotely )

closed, given a break in that line. Someone ofyour team thought it could, but said  !

they would verify this, l i

(R-3) Yes, given a break in the vessel drain line, the isolation valve can be remotely j closed. The appropriate SSAR figure is 21.5.4-2,' sheet 1, valve F004A, which can  !

be remotely closed from the Control Room. l i

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