View source for 1CAN088502, Submits Changes Re Results of Calculations to Evaluate Impact of NUREG-0630 on LOCA Kw/Ft Units,In Response to Recent Questions About Use of New Flecset Heat Transfer Correlation as Compensating Model to Offset Kw/Ft Penalties

{{Adams
| number = ML20133N139
| issue date = 08/05/1985
| title = Submits Changes Re Results of Calculations to Evaluate Impact of NUREG-0630 on LOCA Kw/Ft Units,In Response to Recent Questions About Use of New Flecset Heat Transfer Correlation as Compensating Model to Offset Kw/Ft Penalties
| author name = Enos J
| author affiliation = ARKANSAS POWER &amp; LIGHT CO.
| addressee name = Stolz J
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000313
| license number = 
| contact person = 
| case reference number = RTR-NUREG-0630, RTR-NUREG-630
| document report number = 1CAN088502, 1CAN88502, NUDOCS 8508130387
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 2
| project = 
| stage = Other
}}

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a ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK. ARKANSAS 72203 (501) 3716 August 5, 1985 1CAN088502 Director of Nuclear Reactor Regulation ATTN:    Mr. J. F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555

==SUBJECT:==
Arkansas Nuclear One - Unit 1 Docket No. 50-313 License No. OPR-51 Nurog 0630 - Revised Bounding Assessment Gentlemen:
In previous correspondence AP&L submitted the results of work performed through the B&W Owners Group to evaluate the impact of Nureg 0630. These           .
results indicated a .5 kw/ft penalty at the 2 ft elevation for the LOCA kw/ft limits. B&W's evaluation assigned the same penalty at the 4 and 6 ft.
elevations as well.
In responding to recent questions concerning the use of the new FLECSET heat transfer correlation as a compensating model to offset those penalties, B&W performed additional calculations for the 4 and 6 ft. core elevations.
Rather than confirming their previous application of the 2 ft. penalty, B&W determined that the impact of the Nureg 0630 models were more severe than previously predicted.
The changes in LOCA kw/ft (BOL) units are summarized below.
Core               Original kw/ft limits              Revised kw/ft limits Elevation (ft)          _ with Nureg 0630                     with Nureg 0630 2                         13.5                               13.5 4                         16.1                               16.1 6                         17.5                               16.5 8                         17.0                               17.0 10                         16.0                               16.0 e
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MEMBER MiOOLE SOUTH UTILITIES Sv87EM L_

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       .;.,      Mr. J.' F. Stolz                                         August 1, 1985 These new kw/ft limits have been examined by B&W for their impact on Technical Specification Operating Limits and alarm setpoints for ANO --
  ,              Cycle 7 fuel cycle. The investigation confirmed that the existing operating limits are not affected by the changes at the 4 and 6 ft. elevations.
Therefore no changes to the present tech spec operating limits are required.
However, the bases for section 3.5.2 (specifically Figure 3.5.2.4) will require revision. AP&L will submit a proposed change for this item shortly.
Very truly yours,
                                                          /
J. Ted Enos Manager, Licensing 3 JTE:CT:ds I
    *T E}}