ML20065K162

Rev 2 to Reload SE Methods for Application to Monticello Nuclear Generating Plant

ML20065K162
Person / Time
Site:	Monticello
Issue date:	04/12/1994
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML20065K161	List: ML20065K152 ML20065K162
References
NSPNAD-8608, NSPNAD-8608-R02, NSPNAD-8608-R2, NUDOCS 9404190201
Download: ML20065K162 (2)

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Attachment 1 4.2.3 CELI 1CM POWMU16IU2 Critical Power Ratio in caltulated using the General Electric BWR Thermal Analynio Bauis (GETAB) [18,19,20). The GEXL corrolation was obtained from Gonoral Electric for use t f Northern States Power as a part of the curront fuel contract.

The GEXL correlation has been incorporated into the DYNODE-B hot channel model.

Input to this model consists of tho bundle averago radial peaking factor, the relativo bundlo inlot flow, the bundle initial prosnure and inlet enthalpy, tho bundle R-factor, and the axial power dlotribution. The axial power diatribution g-uned in tho hkywie in given in Tablo 4.2-2, which in taken from Hoference 7.

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The R-factors are uupplied by General Electric.

The bundlo averago redial peaking factor and the relative bundio inlet flow factor are accumed constant throughout the transient and are calculated from tho throo-dimonotonal simulator (1) with the appropriate uncertaintion included (coo noction 4.2.1.1). The GEXL correlation safety limit (oue section 4.3.1) includou an 8.7% (ono atandard dovlation) uncertainty on the TIP readings. As long an the NSPflAD dotormined bundio power u.odel rollability factor (coo Section 4.2.1.1) la Joun than 8.7%, no additional uncertainty need be applied.

4Q Proper progranvning and uno of the GEXL correlation wao tented by comparing ntoady stato CPR valuon for the f u o .l. types of interent. Small differences will oxiot betwoon the GE and DYNODE-U valuou due to a ulight differencu in tho water property tablon uned. Theno comparloonn are chown in Table 4.2-3. Further comparinano are alao chown in Table 4.1-5.

Theco compartoonu show that NSPNAD han properly implemented the GEXL correlation and that it can be uned, along with the acnociated nafety ilmLt (see acetion 4.3.1), in liconoing calculati.onn.  !

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Attachment 2 4.2.3 SEITICAL POWER RATIO Critical Power Ratio is calculated using the General' Electric BWR Thermal  ;

Analysis Basis (GETAB) [18,19,20). The GEXL correlation was obtained from General Electric for use by Northern states Power as a part of the current fuel contract.

The GEKL correlation has been incorporated into the DYNODE-B hot channel model.

Input to this model consists of the bundle average radial peaking factor, the relative bundle inlet flow, the bundle initial pressure and inlet enthalpy, the bundle R-factor, and the axial power distribution. The axial power distribution used in the benchmarks is given in Table 4.2-2, which in taken from Reference 7.

3 Time varying axial power shapes will be used for all safety evaluations. This will provide additional conservatism over the benchmark cases. The R-factors are supplied by General Electric.

1 The bundle average redial peaking factor and the relative bundle inlet flow factor are assumed constant throughout *he transient and are calculated from the three-dimensional simulator (1) with the appropriate uncertainties included (see section 4.2.1.1). The GEXL correlation safety limit (see section 4.3.1)-

includes an 8.7% (one standard deviation) uncertainty on the TIP readings. As long as the NSPNAD determined bundle power model reliability factor (see Section 4.2.1.1) is less than 8.7%, no additional uncertainty need be applied.

Proper programming and use of the GEXL correlation was tested by comparing steady state CPR values for the fuel types of interest. Small differences will extut between the GE and DYNODE-B values due to a slight difference in the water property tables used. These comparisons are shown in Table 4.2-3. Further comparisons are also shown in Table 4.1-5.

Thene comparisons show that NSPNAD has properly implemented the GEXL correlation and that it can be used, along with the associated safety limit (see section 4.3.1), in licensing calculations.

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