ML20033F550
| ML20033F550 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 03/15/1990 |
| From: | FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML20033F549 | List: |
| References | |
| NUDOCS 9003220023 | |
| Download: ML20033F550 (3) | |
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TSCRN 179 CURRENT TECHNICAL SPECIFICATION FORNAT i
s PROPOSED CHANGES i
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s P_0FfR DISTRIBUTION LIMITS SURVEILLANCE RE0VIREMENTS (Continued) a.
Prior to initial operation above 75 percent of RATED THERMAL POWER after each fuel loading, and b.
At least once per 31 Effective Full Power Days.
c.
The provisions of Specification 4.0.4 are not applicable.
4.2.2.2 The measured Fg of 4.2.2.1 above, shall be increased by 2.0% to account for manufacturing tolerances and further increased by 7.5% to account for measurement uncertainty.
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i CRYSTAL RIVER - UNIT 3 3/4 2-5 Amendment No.
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POWER DISTRIBUTION LIMITS l
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FN Nuclear Enthalpy Rise Hot Channel Factor, is defined as the ratio of hH-the integral of linear power along the rod on which minimum DNBR occurs to the. average rod power.
It has been determined by extensive analysis of possible operating power shapes that the design limits on nuclear power peaking and on minimum DNBR at full power are met, provided:
Fg s 3.13; FN s 1.71 kH
- Power Peaking-is not a directly observable quantity and therefore limits have been established on the bases of the AXIAL POWER IMBALANCE produced by the power peaking.
It has been determined that the above hot channel factor limits will be met provided the following conditions are maintained.
'l.
Control rods in a single group move together with no individual rod insertion differing by more than 6.5% (indicated position) from the group average
' height.
2.
Regulating rod groups are sequenced with overlapping groups as required in Specification 3.1.3.6.
3.
The regulating rod insertion limits of Specification 3.1.3.6 and the axial power shaping rod insertion _ limits of Specification 3.1.3.9 are maintained.
4.
AXIAL POWER IMBALANCE limits are maintained. The AXIAL POWER IMBALANCE is L
a measure of the difference in power between the top and bottom halves of the core. Calculations of core average axial peaking _ factors for many plants and-measurements from operating plants under a variety of operating l
conditions have been correlated with AXIAL POWER IMBALANCE. The correlation i
shows that the design power shape is not exceeded if the AXIAL POWER i-IMBALANCE is maintained within the limits of Figures 3.2-1, and 3.2-2.
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The design limit power peaking factors are the most restrictive calculated at full power for the range from all control rods fully withdrawn to minimum allowable control rod insertion and are the core DNBR design basis. Therefore, for operation at a fraction of RATED THERMAL POWER, the design limits are met.
Wgen using incore detectors to make power distribution maps to determine Fg and F H:
A The measurement of total peaking factor, FnMeas, shall be increased by 2.0
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percent to account for manufacturing tolerances and further increased by 7.5 percent to account for measurement error.
CRYSTAL RIVER - UNIT 3 8 3/4 2-2 Amendment Nos.