ML18347A544

Submits Revised Table 6 of Special Report No. 9, Palisades Cycle II Start-Up Report August 27, 1976, Which Makes Provision for Measurement Uncertainty Allowance of 10% of Net Rod Worth

ML18347A544
Person / Time
Site:	Palisades
Issue date:	11/09/1976
From:	Bixel D Consumers Power Co
To:	Schwencer A Office of Nuclear Reactor Regulation
References
Download: ML18347A544 (3)

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consumers

• Power company Director of Nuclear Reactor Regulation Att: Mr Albert Schwencer, Chief Operating Reactor Branch No 1 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - SPECL'l.L REPORT NO 9 - REVISION OF TABLE 6 Based on discussion with members of your staff (on October 20 and 21, 1976),

we have revised Table 6 of special report No 9 entitled "Palisades Cycle II Start-Up Report August 27, 1976." The attached Table 6 makes provision for a measurement uncertainty allowance of 10% of the net rod worth. In order to provide this margin, the power dependent insertion limit curve has been revised to allow less rod insertion at power levels below 43% pow.er. A copy of the present power dependent insertion limit curve is attached for your information.

The curve presented as Figure 3-6 of the Technical Specifications was first submitted as Figure 1 of Section 1 of Attachment 1 to our October 12, 1972 request for a power level increase from 60% to 100% of rated power. This curve was more restrictive than the previous curve (Figure 3-15 of the FSAR) and re-flected the reduced allowable power peaking required to meet AEC criteria for peak clad temperature for LOCA with "densified" or "collapsed clad" fuel.

After completion of the zero power physics test for Cycle 2, the allowable rod insertion was restricted, at zero power, to approximately 50% of Group 3. This provided about 1% ~P additional shutdown margin at beginning of life.

The present curve (attached) is designed to provide the margin specified in re-vised Table 6 (Cycle 2 start-up report) for end of life conditions, David A Bixel Assistant Nuclear Licensing Adminis

• CC: JGKeppler, USNRC

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• .J TABLE 6 Palisades Cycle II Shutdown Margin BOC EOC HZP HFP HZP HFP Do:p:pler Defect 0 1.0 0 1.0 Moderator Temperature Defect 0 0.2 0 o.8 Moderator Void Defect 0 0 0 0.1 PDIL Rod Insertion Worth l.05 0.07 1.24 0.15 Axial Flux Redistribution 0 0 0 0.5 Total Reactivity Allowances . 1.05 1.27 1.24 2.55 Total Measured Full-Lengtn Rod Worth 8.53 8.53 8.68* 8.68*

Stuck Rod Worth 3.22 3.22 3.52 3.52 Net Available Worth 5.31 5.31 5.16 5.16 Measurement Uncertainty Allowance 0.53 0.53 0.52 0.52 Shutdown Margin 3.73 3.51 3.40 2.09

• Required Margin

• EOC Rod Worth = EOC 3.40 2.00 BOC (Measured)

(Calculated) x BOC (Calculated) 3.40 2.00 Revised October 28, 1976

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