ML20077B841
| ML20077B841 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/14/1983 |
| From: | Tucker H DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8307250455 | |
| Download: ML20077B841 (3) | |
Text
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DUKE POWER GOMPJLNY P.O.190x 33180 CllAltLOTTE, N.C. 28242 IIA 1. H. TUCKER TELEPHONE (704) 373-4531 m a ennsommy July 14, 1983
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mo-Mr. Harold R. Denton,, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention:
Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: Catawba Nuclear Station Docket Nos. 50-413 and 50-414
Dear Mr. Denton:
Section 8.4.10 of the Catawba Safety Evaluation Report provides a discussion of Confirmatory Item 38, 100% Load Rejection Capability. Attached is a revised response to FSAR question 430.110 which addresses this item.
Very truly yours, Wb C W Q_
Hal B. Tucker ROS/php Attach:aent cc:
Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303 NRC Resident Inspector Catawba Nuclear Station Mr. Robert Guild, Esq.
Attorney-at-Law P. O. Box 12097 Charleston, South Carolina 29412 p#f Palmetto Alliance 2135 Devine Street
'I Columbia, South Carolina 29205 8307250455 830714 PDR ADOCK 05000413 E
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Mr. Harold R. Denton, Director July 14, 1983:
Page 2 s
cc:
Mr.~ Jesse L. Riley Carolina Environmental Study Group 854 Henley Place Charlotte, North' Carolina 28207 Mr. Henry A. Presler, Chairnian
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Charlotte-Mecklenburg Environmen'tal Coalition
- 945 Henley Place s
Charlotte, North Carolina 28208 i
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CNS 430.110 Section 10.4.4.1 of the FSAR indicates Catawba can accept up to 100%
turbogenerator load reduction without tripping the reactor or main steam relief valve actuation.
Since this allows the turbine gene-t.
rator to remain on line powering station loads following a loss of the offsite power system, describe the magnitude and effect of the transient and steady state voltage and frequency output of the main generator on the ' station loads (especially on Class 1E loads) starting with and following load reduction.
R?sponse:
If.the' turbine generator is subjected to a 100% load reduction, the maximum voltage cn the output of the generator is estimated to be approximately 129% of rated with the period of the excursion where voltage'is above 110% of rated being approximately 3.2 seconds. The maxirum frequency is estimated to be approximately 107.5% of rated.
Based on equipment ratings and test parameters, the brief transient resulting from a 100% load reduction on the turbine generator is not expected to have an adverse effect or impact on equipment / unit operation.
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430-53 Rev. 8
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