ML17298B364
| ML17298B364 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/05/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| ANPP-30760, NUDOCS 8410180517 | |
| Download: ML17298B364 (4) | |
Text
Arizo a Pu lie Service Company Director of Nuclear Reactor Regulation Hr. George M. Knighton, Chief Licensing Branch No.
3 Division of Licensing U. S. Nuclear Regulatory Commission bfashington, D. C.
'0555 October 5,
1984 ANPP-30769 EEVBJr/KLH
Subject:
Palo Verde Nuclear Generating Station (PYNGS)
Units 1, 2 qnd 3
10 CFR 50, Appendix R Associated Circuits Docket Nos.
STN 50-528/529/530 File: 84-056-026; G.1.01.10,
Dear Hr. Knighton:
PVNGS has recently completed the evaluation of associated circuits per 10 CFR 50 Appendix R, Sections III.G,2 and. IXX.G.3.
The associated circuit concerns evaluated were:
a.
Common power source associated circuits.The common power source concern is found in circuits,,either nonsafety-related or safety related, where there is a common power source with shutdown equipment and the power source is not electrically protected from the circuit of concern.
b.
Common enclosure associated circuits The common enclosure concern is found when redundant circuits are routed together in a raceway or enclosure and they are not electrically protected or fire can destroy both circuits due to inadequate fire protection means.
The evaluation results are as follows:
a.
Common Pow'er Source Associated Circuits J
All safe-shutdown circuits which share common po~er source with=
non-safe shutdown circuits are electrically protected by coordinated relays,
- fuses, or circuit breakers.
An evaluation has been performed to verify this, and is available for audit.
Holded case circuit breakers associated with safe-shutdown power sources will be inspected and tested on a periodic basis.
The undervoltage protective relays for the Class 1E switchgear and the diesel generator protective relays will be calibrated during each refueling outage.
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The remaining Class 1E and Non-Class 1E Protective relays will be calibrated at least on a tri-refueling outage interval.
Therefore, PVNGS does not have any circuits associated by common power source.
b.
Common Enclosure Associated Circuits All power circuits in common enclosures are electrically protected with circuit breakers or fuses which will prevent secondary electrical fires from occurring..
All cable (1E & Non 1E) is IEEE-383 qualified as fire resistant.
This minimizes the propagation of exposure fires away from the primary source.
All Non-1E circuits are separated from 1E circuits under the guide-lines of Reg Guide 1.75 (lEEE 384-74).
A computer program exists to check routings to assure Non-1E circuits are not routed with lE circuits.
As discussed in FSAR Section 8.3; all circuits are color identified to provide a means of distinguishing safety related cables and preventing the intermixing of cables.
Cable penetration through fire areas are fire rated with sealed penetrations to prevent propagation of the flame beyond a fire area.
Therefore, PVNGS does not.have any circuits associated by common enclosure which would prevent safe shutdown under fire conditions anywhere in the plant..
If you should have any questions, please contact me.
Very truly yours, E. E.
Van Brunt, Jr.
APS Vice President Nuclear Production ANPP Project Director EEYBJr/KLH/bg cc:
E.
A. Licitra A. C. Gehr
lA I
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