ML20154Q857
| ML20154Q857 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 03/19/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Harold Denton, Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8603240139 | |
| Download: ML20154Q857 (9) | |
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DUKE POWER GOMPANY P.O. Box 33189 i
CHARLOTTE, N.C. 28242 HAL B. TUGKER "1N"
' M 3*838 vice emes DeNr NOT, LEAR PROpt)CTION March 19, 1986 Mr. Harold R. Denton, Director 1
Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 i
Attention: Mr. B. J. Youngblood, Project Director-PWR Project Directorate No. 4 i.
Re: Catawba Nuclear Station, Unit 2 Docket No. 50-414
{
Dear Mr. Denton:
I This letter is in response to a concern raised by the NRC Staff regarding a revision of the 125V DC Vital Instrumentation and Control Power Test-(Section 14, SSER #5). This test was conducted'as a part of the Initial Startup Test program for Units 1 and i of the Catawba' Nuclear Station. The test abstract was revised to eliminate an unnecessary requirement.for a comparison of the actual loads to the design loads-on the vital' buses during ESF testing on Unit 2.
A comparison of the actual loads to the design loads for this system was determined to be unnecessary for the following reasons:
(1) The original calculations of the design loads were done for both units under the same calculation number, i
l (2) The Low Voltage Load List for Vital DC panels shows the loads on j
the Unit 2 system to be very similar, in most cases equal'to or less than, the loads on the Unit 1 system.
l (3) The actual loads on the Vital DC buses were recorded during ESF-i testing on Unit 1-to demonstrate that the design loads were conservatively calculated. The traces recorded during Unit 1 ESF testing are included in Enclosure 2 as well as a copy of FSAR figure 8.3.2-4.^.A comparison of'these traces to FSAR figure 8.3.2-4 shows that the actual loads are significantly below the-j duty cycle for which the batteries were designed. ' Therefore, any differences in loads between the units are more than compensated for by the large margin of conservatism in the _ battery capacity.
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- March 19, 1986 Page Two t
. For-the above reasons, it is our conclusion that a comparison of actual loads to the design loads for the Vital DC System of Unit 2 is not necessary.
Very truly yours,
- /
2c-Hal B. Tucker WLH: sib Enclosure cc:
Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Catawba Nuclear Station e
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CATAWBA NUCLEAR STATION Figure 8.3.2-4 Rev. 7 4
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