ML20002B293
| ML20002B293 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 12/03/1980 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20002B289 | List: |
| References | |
| NUDOCS 8012110267 | |
| Download: ML20002B293 (3) | |
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Zion Station Units 1 and 2 NRC Docket Nos. 50-295 and 50-304 8012110%7
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10 20 30 40 so 35 b
Region Average Burnup (1000 Pfm/MTU)
In accordance with the approved Westinght se DNB Parameters:
The limits on the DNB related model as presented in WCAP-8381, no collapses parameters assure that each of the parameters are expected throughout the fuel cycle of is maintained within the normal steady state operation.
Thu predicted minimum times for envelope of operation assumed in the transient clad flattening are:
and accident analyses.
The limits are consistent with the initial FSAR assumptions and have been Fuel Region EFPH analytically demonstrated adequate to maintain a minimum DNBR of 1.30 throughout each analyzed 1
19,500 transient.
2
> 30,000 3*
>30,000 The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> periodic surveillance of these para-meters thru instrument readout is sufficient for Zion Unit 1.
The predicted minimum times to ensure that the parameters are restored within to collapse for Unit 2 are:
their limits following load changes and other expected transient operation.
The 18 month Fuel Region EFPH periodic measarement of the RCS total flow rate is adequate to detect flow degradation and ensure 1
27,000 correlation of the flow indication channels with 2
2h30,000 measured flow such that the indicated percent 3*
>30,000 flow will provide sufficient verification of flow rate on a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> basis.
A desiga criterium requires that proposed re-load fuel region exposure levels expected at A quadrant to average power tilt will be indicated the time of discharge not exceed the pre-by the excore decectors.
The excore current tilt dicted minimum collapse time.
Operation in is indicated by the arrangement of the current the exposure range in which clad collapse is recorders on the control board.
Four 2 pen postulated is not permitted under these recorders are provided, the pens are grouped so technical specifications.
that, in the absence of a tilt, the two The predicted minimum time to collapse for all reload fuel regions is greater than 30,000 effective full power hours.
Except that the four (4) Region 3 assemblies to be used in the Extended Burnup Program have a predicted minimum time to collapse greater than 41000 EPPH.
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