ML17300B219
| ML17300B219 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 12/28/1989 |
| From: | Chaffee A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Conway W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| References | |
| NUDOCS 9001040048 | |
| Download: ML17300B219 (8) | |
See also: IR 05000528/1989036
Text
.ACCELERATED DISTRIBUTION DEMONSTRATION SYSTEM
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
DOCKET
05000528
05000529
05000530
CESSION NBR:9001040048
DOC.DATE: 89/12/28
NOTARIZED: NO
FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi
STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi
STN-50-530 Palo Verde Nuclear .Station, Unit 3, Arizona Publi
AUTH.NAME
-
AUTHOR AFFILIATION
CHAFFEE,A.E.
Region 5, Ofc of the Director
RECIP.NAME
RECIPIENT AFFILIATION
CONWAY,W.F.
Arizona Public, Service
Co.
(formerly Arizona Nuclear Power
SUBJECT:
Ack receipt of 891121 1tr informing NRC of steps
taken to.
correct violations noted in IRs 50-528,529
& 530/89-36..
DISTRIBUTION CODE:
IE01D
COPIES
RECEIVED:LTR
ENCL
SIZE:
TITLE: General
(50 Dkt)-Insp Rept/Notice of Vio ation
R sponse
NOTES'tandardized
plant.
Standardized
plant.
/
05000528
, 05000529
05000530
E
RECIPIENT
ID CODE/NAME
PD5
DAVIS,M.
INTERNAL:'CRS
AEOD/DEIIB
DEDRO
NRR/DLPQ/LPEB10
NRR/DREP/PEPB9D
NRR/DRIS/DIR
NRR/PMAS/ILRB12
OE~
J
RWG FILE
0
'ram~ri~~l
EXTERNAL: LPDR
NOTES'OPIES
LTTR ENCL
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
RECIPIENT
ID CODE/NAME
CHAN,T
AEOD/TPAD
NRR SHANKMAN,S
NRR/DOEA DIR ll
NRR/DREP/PRPB11
NRR/DST/DIR 8E2
NUDOCS-ABSTRACT
OGC/HDS 1
RES MORISSEAU,D
NRC PDR
COPIES
LTTR ENCL
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
D
NOTE TO ALL"RIDS" RECIPIENTS:
c.
A
'-'
D
PLEASE HELP US TO REDUCE WASTEI CONTACI'HE,DOCUMENT CONTROL DESK,
ROOM Pl-37 (EXT. 20079) TO ELMINATEYOUR NAMEFROM DISTRIBUTION
LISTS FOR DOCUMENTS YOU DON'T NEEDl
TAL NUMBER OF COPIES
REQUIRED:
LTTR
28
ENCL
28
Docket Nos.
50-528
50"529
50-530
Arizona Public Service
Company
P.
0.
Box 53999
Phoenix,
85072-3999
Attention:
Nr. Milliam F.
Conway
Executive Vice President,
Nuclear
Gentlemen:
Thank you for your letter of November 21,
1989, in response
to our Notice of
Violation and Inspection
Report
Nos.
50-528/89-36,
50-529/89-36
and
50-530/89-36,
dated October 25,
1989, informing us of the steps
you have taken
to correct the items which we brought to your attention.
Your'orrective
actions
wi 11
be verified during a future inspection.
Based
on our review of the information you provided to support the
position denying violation 50-528/89-36-01,
we have concluded that the
violation was valid.
Your response
agreed that open, valve V004 created
the
gravity drain path which allowed the event to occur.
Additionally, your
response
stated that valve V004 was intentionally not placed
on the valve
lineup,
was not part of the desired flow path,
and thus
was intentionally left
open.
However,
as noted in the citation, your Unit 1 Night Order of Nay 25,
1989 required that
"Mhen any evolution is-planned,
sufficient valves which
encompass
the desired flow path, must be actually verified to ensure that the
water flows only from/through/to the desired portions of the system."
Since
open valve V004 provided
a flow path through which water
may flow other than
"from/through/to 'he desired portions of the system,
then it follows from the
Night Order that this alternate potential flow path was required to have
been
eliminated by verifying a valve in this path
(V004) actually shut.
Your assertion
that the operators
intentionally left V004 open further adds to
our concern that the operators
apparently did not fully appreciate
the
significance of alternate potential flow paths,
which was partly the cause of
the previous event in Unit 3 as noted in the citation,
and which the Unit j.
Night Order was specifically written to avoid.
In fact, you noted from your
own analysis of this event that the Shift Supervisor
and his assistant
failed
to adequately
consider all potential gravity drain paths prior to the
evolution.
Furthermore,
your described corrective action emphasized verification of the
desired position of all valves in branch paths
as well as the desired flow
path.
Thus,
we conclude that the meaning
and intent of the Night Order,
within the context of its use
as implementation of corrective action following
the Unit 3 incident,
should
have prompted operator action to identify and
900i04004S
891228
AOOCK 0500052'-"
O
-2-
DEC 2 " iSss
isolate the inadvertent flow path which caused
the Unit 1 problem.
Accordingly, withdrawal of the violation is unwarranted.
Your cooperation with us is appreciated.
Sincerely,
bcc w/copy of letter ll/21/89:
docket file
State of California
A. Johnson
G.
Cook
B. Faulkenberry
J. Martin
Resident
Inspector
Project Inspector
J. 2ollicoffer
M. Smith
A.
E. Chaffee,
Deputy Director
Division of Reactor Safety
and
projects
REGION Y
DCoe
TPo1i~ch
SRicjat)s
ADo
o
AChaffee
IP'ES
/
NO
] YES /
NO
YES /
NO
] YES
NO
] YES /
NO
]
YES /
NO
]
iiolate the 5nadvertent
flow path which caused
the Unit 1 problem.
According'ly, withdrawal
UC Llw vlulation is unwarranted
Your coopiration with us is appreciated.
S incer ely,
bcc w/copy of letter ll/2l/89:
docket file
State of Ca)ifornis
A. Johnson
G,
Gook
B. Faulkenberry
J. Hartin
Resident
1nspector
Pro]act Inepector
J. Eo3licoffer
H, Smith
A.
E. Chaffee,
Oeputy Director
Division of Reactor Safety and
Pro)ects
REGION V
DCoe
TPolic
SRichards
AJohnson
AChaffee
YES /
NO
ES'
NO
YES /
NO
YE
/
ND
YES /
NO
YES /
HO