ML20065H760

Informs of Submittal of Supporting Accelerated ABWR Schedule Re Suppression Pool Strainers,Which Will Incorporate Agreed Upon Requirements & Including Sample Calculation

ML20065H760
Person / Time
Site:	05200001
Issue date:	04/11/1994
From:	Fox J GENERAL ELECTRIC CO.
To:	Poslusny C Office of Nuclear Reactor Regulation
References
NUDOCS 9404150141
Download: ML20065H760 (2)

Text

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i^ , . GENuclearEnergy GeneralElectat Company

[.' 11S Cortner Avenue. San Jose. CA 95125 April 11,1994 Docket No.52-001 Chet Poslusny, Senior Proj,ect Manager Standardization Project Directorate Associate Directorate for Advanced Reactors and License Renewal Office of the Nuclear Reactor Regulation

Subject:

Submittal Supporting Accelerated ABWR Schedule -

Suppression Pool Strainers

Dear Chet:

In a conference all on April 11,1994, between GE Nuclear Energy and the NRC Staff, an agreement for closing Open item 6.2.1.9-1 (Suppression Pool Stramer) of the ABWR Advanced FSER was reached. Messrs. R. Barrett, J. Moninger, D. Tang, and C. Poslusny fo the NRC and C. Sawyer, A. Beard and W. Taft of GENE participated in the call and agreed that the requirements in the enclosure satisfactorily resolve this Open Item F6,2.1.9-1. A SSAR mari r p of Appendix 6C will follow in the next couple of days incorporating the agreed upon requirements and including a sample calculation.

If you should have any further questions, please contact Alan Beard at (301)770-5985.

Sincerely,

.,. af Jack Fox Advanced Reactor Programs cc: A.lan Beard GE)

Norman Fletcher DOE)

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1)

• kll ECCS Strainers will at a minimum be sized to confonn with the guidance provided in Reg Guide 1.82 Rev. I for the most severe of all postulated breaks.

2)- The following clarifying assumptions will also be applied and will take precedence:

a) The debris generation model will utilize right angle cones acting in both directions; b) The amount of insulation debris generated will be assumed to be 100%

of the insulation in a distance of 3 L/D of the postulated break within the right angle cones including targeted insulation; c) All of the insulation debris generated will be assumed to be transported  ;

to the suppression p(x)h d) The debris in the suppression pool will be assumed to remain suspended until it is captured on the surface of a strainer.

3) The sizing of the RIIR suction strainers will assume that the insulation debris in the suppression pool is evenly distributed to the 3 pump suctions. The strainer size will be determined based on this amount of insulation debris and then increased by a factor of 3. The flow rate used for calculating the strainer size will be the runout system flow rate.

4) The sizing of the RCIC and IIPCF suction strainers will conform to the '

guidance of Reg Guide 1.82 and will assume that the insulation debris in the suppression pool is proportionally distributed to the pump suctions based on the flow rates of the systems at runout conditions. The strainers assumed available for capturing insulation debris will include 2 RIIR suction strainers and a single HPCF or RCIC suction strainer.

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