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

From kanterella
Revision as of 23:01, 9 August 2022 by StriderTol (talk | contribs) (StriderTol Bot insert)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search
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
ML20133N139
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 08/05/1985
From: Enos J
ARKANSAS POWER & LIGHT CO.
To: Stolz J
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0630, RTR-NUREG-630 1CAN088502, 1CAN88502, NUDOCS 8508130387
Download: ML20133N139 (2)


Text

,

^

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

pi p

f d.

MEMBER MiOOLE SOUTH UTILITIES Sv87EM L_

E

.;., 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