ML17305B210
| ML17305B210 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/13/1990 |
| From: | Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 161-03586-WFC-R, 161-3586-WFC-R, NUDOCS 9011290191 | |
| Download: ML17305B210 (5) | |
Text
ACCELERATED DISTRIBUTION DEMONSTRATION SYSTEM l
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9011290191 DOC.DATE: 90/11/13 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2,. Arizona Publi 05000529 STN-50-530 Palo Verde Nuclear Station, Unit.3, Arizona Publi 05000530 AUTH.NAME AUTHOR AFFILIATION CONWAY,W.F.
Arizona -Public Service Co.
(formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION MARTIN,J.B.
Region 5 (Post 820201)
SUBJECT:
Response
to NRC 900801 ltr re violations noted in Insp Repts 50-528/90-25,50-529/90-25
& 50-530/90-25.
DISTRIBUTION CODE: IEOID COPIES RECEIVED:LTR
(
ENCL 0 SIZE:
TITLE: General (50 Dkt)-Insp Rept/Notice of Violation Response NOTES:STANDARDIZED PLANT Standardized plant.
Standardized plant.
D
/
05000528 05000529 A
05000530 D
RECIPIENT IDCODE/NAME PD5 PD TRAMMELL,C.
NTERNAL: ACRS AEOD/DEIIB DEDRO NRR SHANKMAN,S NRR/DREP/PEPB9D NRR/DST/DIR 8E2 NUDOCS-ABSTRACT OGC/HDS1 RGN5 FILE 01 EXTERNAL: EG&G/BRYCE,J.H.
NSIC NOTES COPIES LTTR ENCL RECIPIENT ID CODE/NAME PETERSON,S.
AEOD AEOD/TPAB NRR MORISSEAUFD NRR/DLPQ/LPEB10 NRR/DRIS/DIR NRR/PMAS/ILRB12 OE DIR gREG:FICE&
02 NRC PDR COPIES LTTR ENCL 1
1 1
1 1
1 1
1 D
D NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE AVASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIiX'IINATEYOUR NAME FROID DISTRIBUTION LlSTS FOR DOCUMENTS YOU DON T NEED!
OTAL NUMBER OF COPIES REQUIRED:
LTTR 25 ENCL A
D D
Arizona Public Service Company P.O. BOX 53999
~
PHOENIX, ARIZONA85072-3999 WILLIAMF. CONWAY EXECUTIVEVICEPRESIDENT NUCLEAR 161-03586-WFC/RAB November 13, 1990 Docket Nos.
STN 50-528/529/530 Mr. John BE Martin Regional Administrator, Region V
U.
S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368
Reference:
Letter to J.
B. Martin,
- NRC, from W. F.
- Conway, APS, dated August 1, 1990.
Subject:
Response
to NRC Inspection Report 50-528/90-25, 50-529/90-25 and 50-530/90-25
- Safe Shutdown Emergency Lighting (161-03373).
Dear Mr. Martin:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2,
and 3
Emergency Lighting - Commitment Status File:
90-019-026;.
90-056-026 The referenced letter provided the status of the Emergency Lighting System and actions to be taken by Arizona Public Service (APS) to ensure continued reliability of the Emergency Lighting System.
This letter is being provided to apprise you of the current status of the qorrective actions being taken by APS.
Corrective Action from the Au ust 1
1990 letter Emergi-Lites will be replaced with Holophane Modular Power Stations (MPS) and fluorescent fixtures.
90l 1~)O r
ac 1 a y()1 ll~
DF(
PDC gEo I
Mr. John B. Martin Regional Administrator, Region V
U.
S. Nuclear Regulatory Commission Page Two Seat:us:
The Holophane MPS units and fluorescent fixtures were installed in all three units by August 31, 1990.
Post modification testing was successfully completed in PVNGS Units 1 and 3.
During performance of testing in Unit 2 it was noted that the fluorescent fixtures at the 140'evel of the Main Steam Support Structure (MSSS) were cycling on and off during the discharge t:est of their associat:
d MPS.
This was not observed in either Unit 1 or Unit 3 during testing.
A decision was made not to complete the final turnover of the modification, in any of the three Units, until the cause of the problem in Unit 2 was clearly understood and any necessary corrective measures taken.
The cause of the problem in Unit 2 has been determined to be localized high temperatures causing the ballast in'the fluorescent fixture eo reach a temperature where the automatic cutout in the ballast is actuated.
The solution to the problem is to move the ballasts to a lower temperature environment.
The new configuration will be tested prior eo installation in any of the three PVNGS Units and will be installed firse in Unit 2.
The modification is scheduled eo be completed in all three units by December 15, 1990.
All three Units have been notified of this poeeneial problem and are prepared to take the necessary compensatory actions.
Corrective Action'olophane MPS's will be upgraded to larger capacity units.
Status:
This modification was completed ahead of schedule in all three PVNGS Units.
Corrective Action'he low voltage disconnect relay set point will be lowered on all Exide Uninterruptable Power Supplies (UPSs).
Status:
This modification was completed on schedule in all three PVNGS Units.
Mr. John B. Martin Regional Administrator, Region V U.
S. Nuclear Regulatory Commission Page Three Ef you have any questions, contact Richard Bernier at (602) 340-4295.
Sincerely, WFC/RAB/pmm CC:
Document Control Desk D.
H.
Coe A. H. Gutterman A. C. Gehr