ML17305B137

Forwards SER Supporting Proposed Design to Comply W/Atws Rule,Subj to post-implementation Insp

ML17305B137
Person / Time
Site:	Palo Verde
Issue date:	10/18/1990
From:	Peterson S Office of Nuclear Reactor Regulation
To:	Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
Shared Package
ML17305B138	List: ML17305B137 ML17305B139
References
TAC-59124, TAC-62698, TAC-67168, NUDOCS 9010260142
Download: ML17305B137 (4)

Text

October 18, 1990 Docket Nos. 50-528, 50-529 and 50-530 Mr. William F.

Conway Executive Vice President Arizona Public Service Company Post Office Box 53999 Phoenix, Arizona 85072-3999

SUBJECT:

COMPLIANCE WITH THE ANTICIPATED TRANSIENTS WITHOUT SCRAM (ATWS) RULE

- PALO VERDE NUCLEAR GENERATING STATION (PVNGS) UNIT NOS. 1, 2

AND 3 (TAC NOS.

59124, 62698 AND 67168)

By letters dated February 27 and September 18, 1987, April 27 and September 29,

1989, and July 31, 1990, Arizona Public Service Company (APS) submitted the plant specific design information to comply with 10 CFR 50.62, "Requirements for reduc-tion of risk from....(ATWS) events for light-water-cooled nuclear power plants."

The staff has reviewed this information and concludes that the proposed design conforms to the requirements of 10 CFR 50.62, and therefore, is acceptable.

However, the staff's conclusion is subject to a post-implementation inspection at PVNGS.

The inspection will audit the design documentation, operating procedures and the recor d of the software verification and validation processes.

Our safety evaluation is enclosed.

In the letter dated July 31, 1990, APS stated that due to the scope of the modification required for the diverse auxiliary feedwater actuation system (DAFAS), implementation for Unit 3 is now expected to be performed prior to

• '..restart from the third refueling outage (First quarter, 1993) instead of the second refueling outage (First tluarter, 1991) as committed in your August 6, 1989 and June 25, 1990 letters.

It is the staff's understanding that the modification required for DAFAS can be performed during a short term plant shutdown. period.

Therefore, you should make a best effort to implement the ATWS mitigation system as soon as possible.

Should you have any questions regarding this matter, please contact me.

Sincerely, onqinal Signed By Sheri R. Peterson, Project Manager Project Directorate V

Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation

Enclosure:

Safety Evaluation cc w/enclosure:

See next page DISTRIBUTION N

I

'PD5 Reading MVirgilio DCrutchfield DFoster SPeterson CTrammell Region V

OGC EJordan ACRS (10)

PD5 Gray File OFC NAME DATE DRSP/LA/

5

DRSP/PM

DFoster

SPeterson:sg CT

-10//f/9

10/f5/90 OFACIAL RECORD COPY Docum 9010260142 901018 PDR ADOCK 05000528 P

PDC M/PD5 P/D: PD5:

11

.D

/90:1 /I ( /90 Name:

.PVNGS LTR QFo l

i'

~

~

V

Mr. William F.

Conway Arizona Public Service Company CC:

Arthur C. Gehr, Esq.

Snell 8 Wilmer 3100 Valley Center Phoenix, Arizona 85073 James A. Beoletto, Esq.

Southern California Edison Company P. 0. Box 800

Rosemead, California 91770 Senior Resident Ihspector U.S. Nuclear Regulatory Commission HC-03 Box 293-NR Buckeye, Arizona 85326 Regional Administrator, Region V

U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Mr. Charles B. Brinkman Washington Nuclear Operations Combustion Engineering, Inc.

12300 Twinbrook Parkway, Suite. 330 Rockville, Maryland 20852 Mr. Charles Tedford, Director Arizona Radiation Regul atory Agency 4814 South 40 Street Phoenix, Arizona 85040 Chairman Maricopa County. Board of Supervisors 111 South Third Avenue Phoenix, Arizona 85003 Palo Verde Jack R.

Newman, Esq.

Newman 5 Holtzinger, P.C.

1615 L Street, N.W., Su.ite 1000 Washington, D.C.

20036

i'