ML20091L121

Rev 2 to Byron Unit 1 Cycle 7 Operating Limits Rept

ML20091L121
Person / Time
Site:	Byron
Issue date:	08/25/1995
From:	COMMONWEALTH EDISON CO.
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ML20091L120	List: ML20091L115 ML20091L121
References
NUDOCS 9508280317
Download: ML20091L121 (5)

Text

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' ATTACHMENT Byron Unit 1 Cycle 7 Operating Limits Report (OLR)

Revision 2 1

9508280317 950825

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PDR ADOCK 05000454 l

P PDR

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REVISION 2 BYRON UNIT 1 CYCLE 7 OPERATING LIMITS REPORT - Fxy PORTION This Radial Peaking Factor Limits Report is provided in accordance with Paragraph 6.9.1.9 of the Byron Unit 1 Nuclear Plant Technical Specifications.

The Fxy limits for RATED THERMAL POWER within specified core planes for Cycle 7 shall be:

a: For the lower core region from greater than or equal to 0% to less than or equal to 50%:

1) For all core planes containing bank "D" control rods:

Fy"'" s 1.950 Cycle Burnup 2 0 MWD /MTU

2) For all unrodded core planes:

Fy"'"s 1.732 0s Cycle Bumup s 10,000 MWD /MTU s 1.746 10,000 < Cycle Bumup <

16,000 MWD /MTU s 1.716 Cycle Bumup 2 16,000 MWD /MTU b: For the upper core region from greater than 50% to less than or equal to 100%:

s

1) For all core planes containing bank "D" control rods:

Fy"'" s 1.890 Cycle Bumup 2 0 MWD /MTU

2) For all unrodded core planes:

Fy"'"s 1.784 0s Cycle Bumup s 10,000 MWD /MTU j

s 1.807 10,000 < Cycle Burnup <

16,000 MWD /MTU s 1.769 Cycle Bumup 2 16,000 MWD /MTU These Fxy(z) limits were used to confirm that the heat flux hot channel factor Fo(z) will be limited to the Technical Specification values of:

Fo(z) s I2.501[K(z))

for P > 0.5 and, P

Fo(z) s [5.00][K(z))

for P s 0.5 assuming the most limiting axial power distributions expected to result from the insertion and removal of Control Banks C and D during operation, including the accompanying variations in the axial xenon and power distributions as described in the " Power Distribution Control and Load Following Procedures". WCAP-8403, September,1974. Therefore, these Fxy limits provide assurance that the initial conditions assumed in the LOCA analysis are met, along with the ECCS acceptance criteria of 10 CFR 50.46.

See the Attached Figure 1 for the plot of [ Fa'(z) x P,.i) vs. Axial Core Height.

REVISION 2 BYRON UNIT 1 CYCLE 7 1

OPERATING LIMITS REPORT - MTC PORTION 6

a)

The Moderator Temperature Coefficient (MTC) limits are:

i

1) The BOL/ARO/HZP-MTC shall be less positive than 0 Ak/k/ F.

d

2) The EOL/ARO/RTP-MTC shall be less negative than -4.1 x 10 &Jk/ F.

b)

The MTC surveillance limit is:

The 300 ppm /ARO/RTP-MTC should be less negative than or equal to

-3.2 x 10 Ak/k/ F.

where:

BOL stands for Beginning of Cycle Life ARO stands for All Rods Out i

HZP stands for Hot Zero Thermal Power i

EOL stands for End of Cycle Life RTP stands for RATED THERMAL POWER I

j

REVISION 2 BYRON UNIT 1 CYCLE 7 OPERATING LIMITS REPORT Table 1 Maximum Fo

• P vs. Axial Core Height During Normal Operation CORE HEIGHT MAXIMUM (FEET)

Fa

• P BOTTOM 1

0.1252 0.41 2

0.3756 0.77 3

0.6259 1.83 4

0.8763 2.13 5

1.1267 2.37 6

1.3771 2.47 7

1.6274 2.50 8

1.8778 2.47 9

2.1282 2.27 10 2.3786 2.40 11 2.6289 2.44 12 2.8793 2.47 13 3.1297 2.48 14 3.3801 2.49 15 3.6305 2.50 16 3 8808 2.30 17 4.1312 2.49 18 4.3816 2.49 19 4 6320 2.48 20 4.8823 2.46 21 5.1327 2.44 22 5.3831 2.40 23 5.6335 2.18 24 5.8838 2.35 25 6.1342 2.44 l

26 6.3846 2.45 27 6.6350 2.46 28 6.8053 2 46 l

29 7.1357 2.44

[

30 7.3861 2.28 31 7.6365 2.42 32 7.8868 2.39 l

33 8.1374 2.35 l

34 8.3876 2.32 35 8.6380 2.32 36 8 8883 2.27 37-9.1387 2.19 38 9.3091 2.31 39 9.6395 2.31 40 9 8898 2.34 l

41 10.1402 2.36 42 10.3906 2.36 43 10.6410 2.23 44 10.8914 2.13 45 11.1417 1.94 46 11.3921 1.66 47 11.6425 0.71 TOP 48 11.8929 0.41 l

l

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Figure 1 Revision 2 Byron Unit 1 Cycle 7 FQ(Z) X P versus CORE HEIGHT 2.6 e

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2.5 3

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g a

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a m

g ma a a e

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a m

m l

e a

2.1 e

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a Fxy AnalysisPoints e

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! l9 F0(z) Limit l

e m

m

- - - Top Surveillance Limit

.2: 1.8 W

Bottom Surveillance Lint l e

5 I

e oc 1.7 e

a e

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e 1.4 I

1.3 e

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0.9 0

1 2

3 4

5 6

7 8

9 10 11,

12 BOTTOM Core Height (Feet)

TOP

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