ML17300B070
| ML17300B070 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/15/1987 |
| From: | Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 161-00589-JGH-B, 161-589-JGH-B, NUDOCS 8710220089 | |
| Download: ML17300B070 (8) | |
Text
REGULA i Y INFORMATION DISTR IBUTI YSTEM (R IDS) i ACCESSION NBR: 8710220089 DOC. DATE: 87/10/15 NOTARIZED:
NO, DOCKET ¹ FACIL;BTN-50-528 Palo Verde Nuclear Btationi Unit 1> Arizona Publi 05000528 AUTH. NAME AUTHOR AFFILIATION HAYNES'. G.
Arizona Nuclear Poeer Prospect (formerly Arizona Public Berv RECIP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Advises that parts to perform smitch mod (TSM) cannot be obtained to support work at first refueling outage due to procurement difficulties. Encl revised FSAR deletes commitment associated e/TSM at first refueling outage.
DISTRIBUTION CODE:
A001D COPIES RECEIVED: LTR ENCL SIZE:
TITLE:
OR Submittal:
General Distribution NOTES: Standardized plant.
05000528 REC IP IENT ID CODE/NAME PD5 L*
LICITRAe E INTERNAL ACRS NRR/DEST/ADS NRR/DEBT/MTB NRR/DOEA/TSB OQC/HDB1 REB/DE/Elj3 EXTERNAL:
EGSG HRUSKE> S NRC PDR NOTES:
COPIES LTTR ENCL 1
0 1
1 6
6 1
1 1
1 1
1 0
1 1
1 1
1 1
1 1
RECIPIENT ID CODE/NAME PD5 PD D*VIBiM ARM/DAF/LFMB NRR/DEBT/CEO NRR/DEBT/RBH N
S/ILRB 01 LPDR NSIC COP IEB LTTR ENCL 5
5 1
1 1
0 1
1 1
1 1
1 1
1 1
1 1
1 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 29 ENCL 26
I 1
Arizona Nuclear Power Project P.o. BOX 52034 4
PHOENIX, ARIZONA85072-2034 Docket No.
STN 50-528 U.S. Nuclear Regulatory Commission Washington, D.C.
20555 October 15, 1987 161-00589-JGH/BJA Attention:
Document Control Desk Palo Verde Nuclear Generating Station (PVNGS)
Unit 1
Docket No.
STN 50-528 (License No. NPF-41)
Transfer Switch Modification for PVNGS Unit 1
File: 87-E-056-026 87-A-005-419.05
Dear Sirs:
CD
Subject:
C7 0
CD As described in FSAR Section 8.3.1.1.6, the 120 VAC vital instrument bus'es nor- '
LV mally receive power from the 125 VDC buses through inverters.
In the event that an inverter or DC bus is inoperable or is removed from service for maintenance, the associated vital instrument bus can be powered from a
backup power supply which consists of a
480/120 VAC regulating transformer.
A transfer switch is provided to change between the alternate power supplies for the vital instrument buses.
In Units 2
and 3,
these transfer switches are automatic static transfer
- switches, and manual transfer switches are installed in Unit 1.
Both of these transfer switch designs meet the applicable regulatory criteria.
FSAR Section 8.3.1.1.6 states that the Unit 1
manual transfer switches will be replaced with static transfer switches at the first refueling outage.
Due 'to procurement difficulties, the parts to perform the transfer s~vitch modification cannot be obtained to support this work at the first refueling outage.
The parts procurement problems are a direct result of an on-going ANPP investigation of the vendor's quality program.
Due to these difficulties, ANPP has revised the PVNGS FSAR (in accordance with the provisions of 10 CFR 50.59) to delete the com-mitment associated with the transfer switch. modification at the 'irst refueling outage.
A copy of the revised FSAR Section 8.3.1.1.6 is attached for your infor-mation.
It should be noted that ANPP still intends to install the automatic sta-tic transfer switches in Unit 1 in the future.
- However, a schedule for this modi-fication cannot be provided at this time due to the uncertainty involved in the current parts procurement difficulties.
If you have any additional questions on this matter, please contact Mr.
W.
F.
Quinn of my staff.
Very truly yours,
" 87i0220089,8710is PDR ADOCK "05000528
- P PDRI JGH/BJA/rw Attachment J.
G. Haynes Vice President Nuclear Production l(l
d Cj
'1a lq
)J
0 U.S.
NRC Document Control Desk Pag& 2 October 15, 1987 161-00589-JGH/BJA cc:
0.
M. De Michele (all w/a)
E. E.
Van Brunt, Jr.
J.
B. Martin J.
R. Ball G.
W. Knighton E. A. Licitra A. C. Gehr
0 Ill 4
Ij l
~ x f
Attachment to
$61-00589-JGH/BJA PVNGS PSAR Tv @AH ~e >47 F5 AL C.4 p age.
I ~pc.
ONSITE POWER SYSTEMS 8.3.1.1.5 Control Element Drive Mechanism Power Supply Electric power to control element drive mechanisms 1
sms is supplied by two motor-generator sets operating from two separate Non-Class IE 480V load centers.
8.3.1.1.6 Vital Instrumentation and Control Power Suppl upp Y
Pour independent Class IE 120V vital instrumentation and con-trol ac power supplies are provided to supply the four channels of the reactor protection and ESP actuation systems (see fig-ure 8.3-4).
The power supplies are designed to regulate the steady-state voltage within + 2t at full power output for a load power factor of 0.8 at a frequency of 60
+ 0.5 Hz.
The four-bus arrangement provides single-phase, ungrounded, elec-tric power to each of the four protection channels of the reactor protection system that is electrically and physically isolated from the other protection channels.
Each vital ac instrumentation and control power supply consists of one inverter rated at 25 kVA, a transfer switch, a backup voltage regulator, and one distribution panel.
Currently PVNGS Units 2
and 3 have installed an automatic static transfer switch(] a~4 PVNGS Unit 1 utilizes a manual transfer switch,%et it~iH~e-
~:-ep,'Laced-wiuh~he-au toma t-i~-a<ac-i~ aes4er-sw i<oh-pr-ior t~
distribution panel is supplied by the invertex.
Each inverter zs supplied by a separate Class IE 125V dc subsystem as described in section 8.3.2.
If an inverter is inoperable or its output is outside the acceptable operating range or it xs to be removed from service for maintenance or testing.
a backup supply is provided from a separate Class IE regulated power supply through the transfer switch.
Busing arrangements are shown in figure 8.3-4 and system loads are listed in table 8.3-4.
May 1987
- 8. 3-51 Amendment 17
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