ML20134C151
| ML20134C151 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 08/09/1985 |
| From: | Dixon O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8508160223 | |
| Download: ML20134C151 (2) | |
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SOUTH CAROLINA ELECTRIC & GAS COMPANY POST OFFICE 764 CoLUMe A. South CAROLINA 29218 August 9,1985 o.w.omoN.u.
vice PassaceNT NUCLEan oPenarioNS Mr. Harold R. Denton, Director Of fice of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Virgil C. Fammer Nuclear Station Docket Nc. 50/395 Operat ag License No. NPF-12 i
Dear Mr. Denton:
In a letter from Mr. O. W. Dixon, Jr., ta Mr. H. R. Denton dated March 6,1985 and supplemented by a submittal dated April 30, 1985, South Carolina Electric and Gas Company (SCE&G) requested an amendment to the Virgil C. Summer Nuclear Station Technical Specifications to reduce the thermal design flow by 1.9%.
As a result of discussions with NRC Staff, SCE&G hereby requests the Bases Section be modified as shown on Attachment A.
This attachment should replace page 9 of 15 to Attachment I contained in the March 6,1985 submittal.
This change does not alter the technical content or position of the original submittal, and is being made only to provide additional clarification to the Bases Section in support of the amendment request.
The application fee required by 10CFR170 was transmitted previously with the March 6, 1985 amendamnt request.
If you should have any further questions, please advise.
Very truly yours, O. W. Dtxon, AMM/0WD/c sw At tachment cc:
V. C. Summer C. A. Price T. C. Nichols, Jr./0. W. Dixon, Jr.
C. L. Ligon (NSRC)
E. H. Crews, Jr.
K. E. Nodland E. C. Roberts R. A. St ough W. A. Willians, Jr.
G. O. Percival D. A. Nauman C. W. Hehl J. Nelson Grace J. B. Knotts, Jr.
Group Managers H. G. Shealy O. S. Bradham NPCF File
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0 ATTACHMENT "A" Insert A Tech. Spec. Insert Fuel rod bowing reduces the value of DNB ratio. Credit is available to of fset this reduction in the generic margin.
The generic design margins, totaling 9.1% DNBR, completely offset any rod bow penalties.* This margin includes the following:
- 1) Design limit DNBR of 1.30 vs. 1.28
- 2) Grid Spacing (K ) of 0.046 vs. 0.059 s
- 3) Thermal Dif fusion Coefficient of 0.038 vs. 0.059
- 4) DNBR Multiplier of 0.86 vs. 0.88
- 5) Pitch reduction The applicable value of rod bow penalties is referenced in the FSAR.
The generic margins also offset the penalty associated with the thermal design flow reduction included in Amendment ___ to the Technical Specifications.
ATTACHMENT I Page 9 of 15 L_