ML20082R797

Revised Pages to Proposed Tech Spec Changes Re RCS Flow Rate Requirements

ML20082R797
Person / Time
Site:	McGuire, Mcguire
Issue date:	12/08/1983
From:	DUKE POWER CO.
To:
Shared Package
ML20082R795	List: ML20082R793 ML20082R797
References
TAC-53214, TAC-53215, NUDOCS 8312130303
Download: ML20082R797 (2)

Text

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8312130003 831208 PDR ADOCK 05000 P

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PENALTIES OF 0.1% FOf. UNDETFCTED 1

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HEASUREMENT UNCERTAINTIES OF i

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1.7% FOR FLOW AND 4% FOR INCORE j

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ACCEPTABLE l

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l OPERATION

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REGION FOR e

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47 OPERATION g

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UNACCEPTABLE I

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! O ERATION 40 i

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m, (1.0, 38.888) g, ACCEPTABI.E OPERATION REGION FO1 L98% RTP (1.0, 38.499) t 6 96% RTP (1.0, 38.110) 38 s 94% RTP (1.0, 37.721)'

5 92% RTP s 90'% RTP

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(1.0, 36.944) l i

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i 0.90 0.92 0.94 0.96 0.98 1.00 1.02 1.04 l

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R ;- F 1.49[1.0+0.2(1.0-P)]

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FIGURE 3.2-3b UNIT 2 RCS fl0t! RATE VERSUS R All0 R2 - FOUR l.00PS Ill OPERATI0li j

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Fuel rod bowing reduces the value of DNB ratio. Credit is available to partially offset this reduction. This credit comes from generic or plant specific design margin.

For McGuire Units 1 and 2, the margin used to partially offset rod bow penalties is 9.1 percent. This margin breaks down as follows:

1) Design limit DNBR 1.6%

2) Grid spacing K 2.9%

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3) Thermal Diffusion Coefficient 1.2%

4) DNBR Multiplier 1.7%

5) Pitch Reduction 1.7%

For McGuire Unit 2, the margin used to partially offset rod bow penalties is 5.9 percent with the remaining 3.2 percent used to trade off against measured flow being as much as 2 percent lower than thermal design flow plus uncertainties. The penalties applied to FyH to account for rod bow (Figures 3.2-4 Unit 1 and Unit 2 ) as a function of burnup are consistent with those described ir. Mr. John F. Stolz's (NRC) letter to T. M. Anderson (Westinghouse) dated April 5,1979 with the difference being due to the amount of margin each unit uses to partially offset rod bow penalties.

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