ML17305A979

Forwards, Conceptual Design for Palo Verde Nuclear Generating Station for Diverse Auxiliary Feedwater Actuation Sys (Dafas) for Review.Schedule of Implementation as Indicated

ML17305A979
Person / Time
Site:	Palo Verde
Issue date:	07/31/1990
From:	Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17305A980	List: ML17305A979 ML17305A981
References
NUDOCS 9008070069
Download: ML17305A979 (6)

Text

O'LERATED D TMBUTION DEMONS RATION SYSTEM

~

'EGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9008070069 DOC.DATE: 90/07/31 NOTARIZED: NO DOCKET FACIL: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 Nu ar Power RECIP.NAME RECIPIENT AFFILIATION R Document Control Branch (Document Control D )

I

SUBJECT:

Forwards, "Conceptual Design for Palo Verde Nucle DISTRIBUTION CODE: AO55D COPIES RECEIVED:LTR TITLE: OR/Licensing Submittal: Salem ATWS Events GL-83-28 NOTES:Standardized plant.

i Generating Station for Diverse AFW Actuation Sys gbAFAS)."

ENCL Q SIZE: 3 + 3 C2 05000529 D

Standardized plant. 05000530 A

RECIPIENT COPIES RECIPIENT COPIES D ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA 1 0 PD5 PD 3 3 D PETERSON,S. 1 1 TRAMMELL,C. 1 1 INTERNAL: ACRS 6 6 NRR/DEST/ESB 8D 1 1 NRR/DLPQ/LPEB10 1 0 NRR/DOEA/OGCB11 1 0 NRR/DST/SICB 7E 1 1 NRR/DST/SPLB 8D 1 0 1 0 OGC/HDS1 1 0 R G ILE 01 1 1 RES/DSIR/EIB 1 1 EXTERNAL: LPDR 1 1 NRC PDR NSIC 1 1 NOTES:

R D

A D

D NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 25 ENCL 19

1'I P

l 4'i

(

I t l,

Arizona Public Service Company P.O. BOX 53999 ~ PHOENIX, ARIZONA85072-3999 WILLIAMF. CONWAY 161-03369-WFC/RAB/KLMC EXECUTIVEVICE PRESIDENT NUCLEAR July 31, 1990 Docket Nos. STN 50-528/529/530 Document Control Desk U. S. Nuclear Regulatory Commission Mail Station Pl-37 Washington, D. C. 20555

References:

1) Letter to U. S. NRC from J. G. Haynes, APS, dated March 13, 1987.

Subject:

PVNGS Schedule for Implementation of the ATWS Rule (161-00074).

2) Letter to U. ST NRC from W. F. Conway, APS, dated August 6, 1989 'ubject: PVNGS Implementation of the ATWS Rule (161-02181).

3) Letter to U. S. NRC from W. F. Conway, APS, dated October 31, 1989.

Subject:

Implementation Schedule for the PVNGS Diverse Scram System-10 CFR 50.62 (ATWS Rule) (161-02561).

Dear Sirs:

Sub j ect: Palo Verde Nuclear Generating Station (PVNGS)

Unit's 1, 2 and 3 PVNGS Diverse Auxiliary Feedwater Actuation System-Conceptual Design and Implementation Schedule for ATWS Rule, 10 CFR 50.62 File: 90-056-026 Enclosed, for your review, is the conceptual design for the PVNGS Diverse Auxiliary Feedwater Actuation System (DAFAS). Reference 1 provided APS's initial commitment concerning the implementation of the DAFAS as prior to restart from the third refueling outage for PVNGS Units 1, 2, and 3. Reference 2 provided a tentative, expedited implementation schedule for Unit 3 as prior to restart from the second refueling outage. Due to the scope of the modification required for DAFAS, implementation for Unit 3 is now expected to be performed prior to restart from the third refueling outage. Therefore, the PVNGS DAFAS implement-ation schedule is as follows:

Unit 1 - Prior to restart from the third refueling outage.

Unit 2 - Prior to restart from the third refueling outage.

nq~ Unit 3 - Prior to restart from the third refueling outage.

9008070069 900731 PDR ADOCK 05000528 geEX P PDC I

E J

hl

Document Control Desk 161-63369AM/RAB/KU'C U. S. Nuclear Regulatory Commission July 31, 1990 Page 2 In addition, as discussed in Reference 3, Unit 2 Diverse Scram System (DSS) has been installed and is functioning as required. The DSS implementation schedule for Units 1 and 3 remains as follows:

Unit l- Prior to restart from the third refueling outage.

Unit 3 - Prior to restart from the second refueling outage.

If you have any questions concerning this matter, contact Mr. R. A. Bernier at (602) 340-4295.

Sincerely, WFC/RAB/KLMC Enclosure CC: J. B. Martin S. R. Peterson C. M. Trammell D. H. Coe A. C. Gehr A. H. Gutterman

'E