ML17297B265
| ML17297B265 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 01/19/1982 |
| From: | Miraglia F Office of Nuclear Reactor Regulation |
| To: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| References | |
| NUDOCS 8202100135 | |
| Download: ML17297B265 (4) | |
Text
ee e
DISTR IfUTION:
cow O'AIQ mgjg OO OlO 07 IFI O
IFI (9%
OQ OQ CUdC NA NILE E
Docket Fi1e LPDR PDR NSIC TERA LB83 Files DEisenhut RPurple SHanauer RVollmer RMattson HThompson 50-528/529/530 EALicitra IJLee IE (3)
ACRS cn MPA OE SAN 1 9 1982 Docket Nos.:
50-528/529/530 Mr. E. E.
Van Brunt, Jr.
Vice President - Nuclear Projects Arizona Public Service Company'ost Office Box 21666 9
Phoenix Arizona 85036 Ap
"~"~~ tgezt
"",",'FP fefAr~~rp,;;,. r
~>f>If f>f~'g>> ><< f I
We request that, within one week of receipt of this letter, you advise us when you will provide the response to this request.
If you have any questions on 'this matter, please contact us.
Sincer ely, Og iginal sipned 1 J.
pea~ J, Mir88lla<
'Tedesco TIDf,'ear Mr. Van Brunt:
FMiraglia JKerrigan
Subject:
Request for Addition'al Information - Palo Verde Nuclear Generating Station Your previous design for prot'ection from sustained low grid voltage conditions, as reported in the Safety Evaluation Report for Palo Verde, included undervoltage relay trip setpoints of 90 per'cent of rated voltage for a longer time and 75 percent of rated voltage fo'r a shorter time.
By letter dated October 28, 1981, the design setpoints for the undervoltage relays were revised so that the only setpoint is at 68.9 "percent of rated voltage.
Based on our review of the revised relay settings selected for undervoltage protection, we find that the revised setpoint of 68.9 percent may be too low to protect the onsite power systems from susta'ined low grid voltage conditions, in conformance with Branch Technical Position PSB 81.
In order for us to determine whether the revi'sed setpoint is acceptable, we require that you provide manufacturer guarantees to show that all affected safety related equipment can operate continuously at 70 percent of rated voltage.
This matter has been discussed with Mr. Gross of your staff.
Frank J. Miraglia, Chief Licensing Branch No.
3 Division of Licensing cc:
See next page.
oFFIGEII>
SURNAMEt>>
OAVEf>
DL'LPg EI',LPdfFra: j 1//J7/82
~
PL
> ~ ~ ~ ~ ~ ~
F.P g1 ia 1/IJ'/82
~ ~ ~ ~ ~ ~ ~ % ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
NRC FORM 318 IIO/8OI NRCM 0240 OFFICIAL RECORD COPY
~ USGPO: 1988~28 824
~~
0 U
1
~
C I'
Mr. E. E. Van Brunt, Jr.
. Vice President Nuclear Projects
~Arizona Publi'c Service Company P. 0.
Box 21666
- Phoenix, Arizona 85036
'PALO VERDE CC Arthur C. Gehr, Esq.
Snell
& Wilmer.
3100 Valley Center
- Phoenix, Arizona 85073 Charles S. Pierson Assistant Attorney General 200 State Capitol 1700 West Washington Phoenix, Arizona 85007 Charles R. Kocher, Esq.; Assistant Counsel James A. Beoletto, Esq.
Southern California Edison Company P. 0. Box 800
- Rosemead, California 91770 Margaret Walker Deputy Director of Energy Programs Economic Planning and Development Office 1700 West Washington Phoenix, Arizona 85007 Mr. Rand.L. Greenfield Assistant Attorney General Bataan Memorial Building Santa Fe, New.Mexico 87503 Resident Inspector Palo Verde/NPS U.S. Nuclear Regulatory Commission P. 0.
Box 21324 Phoenix, Arizona 85001 Ms. -Patricia Lee Hourihan 6413 S. 26th Street Phoenix, Arizona 85040
C 0
i
,I
'P