ML20003G104

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Submits Response to NRC Question on Cycle 7 of Reload 6. Decay Ratio for 7x7 Channel During Cycle 7 Is Zero Out to Fourth Decimal Place.Analytically Determined Stability for Channels Is Expected
ML20003G104
Person / Time
Site: Cooper Entergy icon.png
Issue date: 04/21/1981
From: Pilant J
NEBRASKA PUBLIC POWER DISTRICT
To: Ippolito T
Office of Nuclear Reactor Regulation
References
LAQ8100160, NUDOCS 8104280259
Download: ML20003G104 (1)


Text

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LQA3100160 April 21,1981 /

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Director, Nuclear Reactor Regulation gm APjj8 ,

c1 Attention: Mr. Thomas A. Ippolito, Chief

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U.S. Nuclear Regulatory Co==ission Washingten, DC 20555 #d - TJ16 k@ /

Reference:

1) Letter fros J. M. Pilant to T. A. Ippolito Dated March 5, 1981, " Reload Licensing Submittal, Reload 6, Cycle 7"

Subject:

Response to NRC questions - Reload 6, Cycle 7

Dear Mr. Ippolito:

Reference i submitted for NRC approval the standard reload application for Cycle 7 at Cooper Nuclear Station. In subsequent discussions with the staff, Nebraska Public Power District was requested to answer the following question for= ally on the Docket.

Question:

In section 13 " Stability Analysis Results" of the Supplemental Reload Licensing Sub=ittal, the decay ratio for the 7x7 channel is defined as 0.0. For the previous cycle this value was 0.22. Provide an a=plifying discussion.

Response

The decay ratio for a 7x7 channel during Cycle 7 has been determined to be :ero out to the fourth decimal place. 7x7 channels are typically more stable than Sx3 channels, and the few remaining in the core during Cycle 7 are located in the outer periphery and operate with a low void fraction; therefore, analytically determined stability for these channels is expected.

Due to the accelerated outage schedule for CNS, approval of the reload license amend =ent prior to May 8, 1981 is once again respectfully requested.

Sincerely, N

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. M Jah.Pilant Director of Licensing and Quality Assurance /,l g(

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