ML16341E433
| ML16341E433 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 11/05/1987 |
| From: | Burdoin J, Mendonca M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | |
| Shared Package | |
| ML16341E434 | List: |
| References | |
| 50-275-87-37, 50-323-87-37, NUDOCS 8711240131 | |
| Download: ML16341E433 (16) | |
See also: IR 05000275/1987037
Text
U.
S.
NUCLEAR REGULATORY COMMISSION
REGION V
Report Nos.
50-275/87-37,
50-323/87-37
Docket Nos.
50-275,
50-323
License
Nos.
Licensee:
Pacific Gas
and Electric Company
77 Beale Street
Room 1451
San Francisco,
Cali fornia
94106
Facility Name:
Diablo Canyon Units 1 and
2
Inspection at:
Diablo Canyon Site,
San Luis Obispo County, California
Inspection
Conducted:
October 5-9,
1987
Inspector:
J.
F.
Bur doin,
Reactor
Inspect
Approved by:
M.
M. Mendonca,
Chief
Reactor
Project Section
1
~Summar:
Date Signed
~~/o Id"7
Date Signed
Ins ection Durin
Period of October 5-9
1987
(Re ort Nos.
50-275/87-37
and
50-323/87-37
vital areas
and equipment in the plant,
and followup of enforcement
and open
items.
Inspection
Procedures
Nos.
30703,
36100,
71707
and 92700 were
used
as
gui dance for the inspecti on.
Results:
No violations or deviations
were identified.
8711240131
871109
PDR 'DOCK 05000275
Q
.
DETAILS
Individuals Contacted
A
Pacific
Gas
and Electric
Com an
PGSE
2.
- J. M. Gisclon, Assistant Plant Manager-,
Support Services
- D. B. Mislush, Maintenance
Manager
- N. J. Angus,
Work Planning Manager
T. L. Grebel,
Regulatory
Compliance Supervisor
- W. J. Kelly, Regulatory Compliance Engineer
- M. N. Stephens,
General
Foreman,
Instrumentation
S.
R. Fridley, Senior Operating Supervisor
R. N. Nanninga,
Senior
Power Production
Engineer
N. L. Smith,
Power Producetion
Engineer
J.
E. Strahl, Mechanical
Maintenance
Foreman
J. J. Griffin, Maintenance
Senior Instructor
Various other engineering
and
gC Personnel.
- Denotes attendees
at exit meeting 'on October 9,
1987.
In addition,
NRC Resident
Inspectors
attended
the exit meeting.
A~I<<i
An independent
inspection
was conducted
in Units I and
2 Turbine and
Auxiliary Buildings.
The inspection
examined
areas
and equipment for
debris, potential
hazards,
oi I and water leakage,
and equipment
condition, e.g., oil level, valve position,
and electrical
connection
configuration
and cleanliness.
The equipment
and areas
inspected
included:
A.
Five Emergency
Diesel
Generator
Rooms.
B.
Six 4160 Volt Switchgear
Rooms.
C.
Combined Two-unit Control
Room.
D.
Four Containment
Spray
Pumps.
E.
Four Charging
Pumps, Unit I (three)
and Unit 2 (one, 2-3).
F.
Four Safety Injection Pumps.
G.
Four
RHR Pumps.
H.
Six Component
Cooling Water Pumps.
I.
Pumps.
J.
Six Emergency Battery Rooms.
K.
Six 480 Volt Vital Bus
Rooms.
L.
Two Cable Spreading
Rooms.
N.
Two Hot Shutdown
Panel
Areas.
H.
Two 480 Volt Load Center Areas.
0.
Turbine Building at Elevations 85'nd 140'.
Housekeeping
and equipment status
appeared
to be acceptable.
No violations or deviations
were identified.
C
3.
Followu
of Enforcement
Items
A.
Closed
50-275/323/87-25-01
Radiation Monitor
Environmental
ualification
E/ ) for Am henol
HN Connectors
The inspector
reviewed the licensee's
letter (DCL-87-239 of
September
24, 1987) in response
to the Notice of Violation related
to Inspection
Report 50-275/323/87-28.
This letter described
the
measures
taken and/or planned to be taken to correct the findings of
this violation.
'The violation was that the amphenol
connector's
qualification was not acceptably
documented
in the E/g files.
The licensee
has obtained
a qualification report for the amphenol
connector.
The report was reviewed
and
has
been incorporated into
the
E/g file.
The file and test report demonstrate
the qualification of the amphenol
connector for accident conditions.
The licensee will review E/g files to verify that other design
electrical
connector configurations
are qualified by the applicable
test report by December
15,
1987.
The inspector
reviewed the documentation,
Test Report,
PEN-TR-83-01 dated January
11,
1983 which was
added to complete the
E/g file for the amphenol
HN connector.
The above test report along
with Conax Test Report,
IPS-1054 dated
June
15,
1983 (included in
the E/g file) were examined.
The test conditions were compared to
the profiles of containment pressure
and steam/air
temperature
for
the
maximum safeguards
case
(LOCA).
The test results
demonstrated
the connector
was environmentally qualified and the E/g file for the
connector
was complete.
This item is closed.
Closed
50-275/87-08-02
Oil Slin er Rin
Material
Chan
e from
Brass to Bronze
The inspector
reviewed the licensee's
letter
(DCL-87-110 of May 14,
1987) in response
to the Notice of Violation related to Inspection
Report 50-275/87-08.
DCL-87-110 described
the measures
taken to
correct the findings of this violation.
The violation was that the
change
in material
from brass to bronze
had not been processed
as
a
design
change
as required
by procedure,
but rather,
had been
accomplished
pursuant to maintenance
shop follower, MM-1-85-670.
At the time of the violation,
no specific
DCPP administrative
controls existed for the review of replacement
material suitability
for fabricated parts.
Diablo Canyon Administrative Procedure
(AP)
C-40S3,
"Use of PIMS Corrective
Maintenance
Work Order Module" has
been revised with specific guidelines for evaluating
replacement
material suitability for fabricated quality related parts.
Licensee
maintenance
engineers
are
now required to review work orders
(replaced
shopwork followers) to ensure that parts manufactured
in
the. machine
shop are in accordance
with the applicable
design
specifications.
Also,
a Design
Change is required
when parts
are to
be manufactured different than the specified design.
The
AFW pump manufacturer,
Byron Jackson,
was contacted
by the
licensee
on February
25, 1987,
and verified that the material
substitution of bearing
bronze
ASTM B144 (discontinued
and replaced
by ASTM B-584) for cartridge brass
ASTM B135 was acceptable
and
would not affect
AFW pump operability.
Shopwork Followers
(SWF) documenting work performed prior to the
issuance
of AP C-40S3
have
been
reviewed by the licensee's
equality
Control Department.
This review verified proper materials
have
been
used
on work where parts
were manufactured
in the Plant Machine
Shop.
To verify the licensee's
corrective actions
and audit the original
work in December
1985, the inspector
reviewed
and examined the
following documents:
AP C-40S3,
"Use of PIMS Corrective Maintenance
Work Order
Module"
Borg Warner Industrial Products
Letter of May 1,
1987
Authorizing Bronze
ASTM B-505 or B-584 AL 932 as Substitute for
Brass
ASTM B-135 Alloy 2.
DCO-OM-37589, (date
June
9, 1987) Design
Change,
allowed the
substitution of Bronze
ASTM B-505 or B-584 for Brass
B-135
Alloy 2.
Action Request
A0029756, Discolored Oil in Outboard Bearing
PP 2-2.
equality Evaluation f0003309,
Contaminated
Oil in AFW PP 2-2
SWF, MM-1-85-669,
AFW Pump 1-3, Repair
and Reassemble
Outboard
Bearing.
SWF, NM-1-85-670,
AFW Pump 1-2, Repair
and Reassemble
Outboard
Bearing
SWF, NM-2-85-803,
AFW Pump 2-2, Repair
and Reassemble
Material Request/
Requisition
Form 0019258, for 660 Bronze
(Stock Code 15-9318) Stock for AFW Bearings
Inventory Parts Catalog,
Stock Codes
15-9318
and 72-9658
The above documentation verified the
pump manufacturer's
endorsement
of substituting bronze for brass
in the material for AFW pump
bearing oil slinger rings.
The bronze material
used in shopwork
follower MM-1-85-670 was traced
back to the warehouse
material
request
(19258)
and identified as the substitute material
(bronze
ASTN B505 or B584) for brass
ASTM 135 alloy 2.
The above
documentation
also verified the procedure
changes
the licensee
identified in his corrective steps for the subject violation. It is
concluded the licensee's
corrective actions
taken in response
to the
violation are acceptable.
This item is closed.
C.
(Closed
50-275/323/87-01-01
Use of Unlabeled Lubricant Containers
and
Lack of Lo
Books
0
The inspector
reviewed the licensee's
letter of response
of April 27, 1987) to the Notice of Violation related to Inspection
Report
Numbers 50-275/323/87-01.
The licensee
in DCL-87-083
'described
the measures
taken to correct the findings of this
violation.
The violation was that contrary to prescribed
procedures
(APD-753 Revision 10) unlabeled containers
containing oil and three
unlabeled
grease
guns were found.
In addition log books were not
being maintained in bulk storage
or dispensing
areas
as required
by
procedure.
The inspector performed the following reviews in order to verify the
licensee's
corrective actions:
Inspected lubricant bulk storage
areas
in the turbine building,
the electric
shop
and at the intake structure.
Determined that
all lubricant containers
were properly identified and labeled
in accordance
with procedures.
The log books at each of the above storage
areas
were examined
for lubricant and quantity used,
equipment/person/department
receiving lubricant,
date taken,
and that
a periodic audit of
the log was performed
by the shop foreman.
Examined Revision ll to administrative procedure
D-753 "Control
of Plant Lubricants" for completeness.
Examined the quarterly seminar training plans for electrical
and mechanical
maintenance
personnel
for inclusion of training
on changes
to lubricant control procedure.
Also, examined
attendance
records
for these
seminars.
The above inspections
and examinations verified that the licensee
instituted the corrective actions
described
in response
to the notice of violation. It is concluded that the licensee's
corrective actions in response
to the violation are acceptable;
This item is closed.
No violations or deviations
were identified.
4.
Followu
of 0 en Items
A.
0 en
50-275/323/87-01-04
Slo
e of Air Su
1
Line at Air
0 crated Valves
AOVs)
During a walkdown of a portion of the compressed air system at the
85-foot elevation of Unit 1 turbine building,
an inspector
observed
that the control air supply lines on several
air operated
valves
tended to slope toward the air operators.
The concern
was that if
moisture accumulated
in the air lines it would flow to the air
operator
and could prevent
normal operation of the valves.
The licensee
does not require that air lines attached to valve
actuators
be installed with the air lines sloped
away from the
actuators
because
at
DCPP, the plant air system incorporates
an air
drying system that maintains plant air at a dew point of
approximately
minus 40 degrees
Fahrenheit
which precludes
the
presence
of any significant moisture.
Licensee
engineering
groups
have also re-reviewed
PGandE's
standard practice
and design
specifications,
and concluded that there is no design specification
nor standard field installation practice that requires
negative
sloping of air lines attached
to valve actuators
away from the
actuators.
DCPP has not experienced
any significant buildup of
moisture in the air lines to valve actuators.
Com ressed Air S stem
The inspector
reviewed the compressed air system in section
nine of
the
FSAR and examined the schematic
diagram of the system.
The compressed air system
was designed for process
control systems
and for station service throughout Units 1 and
2 under startup
and
normal operating conditions.
The compressed air system
was not
designed for safe
shutdown,
reactor protection,
containment
isolation, or engineered
safety features
(ESFs).
Four air compressors,
rated
320 scfm each,
located in the turbine
area of Unit 1, were designed to supply compressed air to Units 1
and 2.
Normally, one compressor
is in operation with the remaining
compressors
on a selective
automatic standby-start
scheme.
A master
compressor controller loads the operating
compressor
at 98 psig and
unloads at 105 psig,
measured
at the supply header.
The standby
compressors
automatically start
and load if the header
pressure
drops to 93 psig.
The compressors
have nonlubricated cylinders to provide
an oil-free
air system.
(Local oiling units are provided on the service air
system where equipment requires lubricated air).
Each compressor
has
a water-cooled aftercooler separator
at the discharge
Filter-separators
and
an air dryer in the discharge
line reduce the
air dewpoint to approximately
minus 40~F at system pressure.
The
air dryer has
redundant dryer towers.
The desiccant
in the dryer
tower, which is not on line, is regenerated
with 'air,
and preheated
by an electric heater.
Dry air leaving the air receivers
is again
filtered through
a
3 micron filter before passing to the instrument
and service air distribution systems.
If electrical
power is lost to all the compressors,
or if system
pressure
drops to 90 psig, the service air distribution system is
isolated to reserve
the air in the air receivers for use in the
instrument air system.
There are
7 to 10 minutes of reserve
in
these
receivers
at the expected
rate of usage for plant process
control.
This time is available to restore
the air
system.
Alarms in the control
room indicate:
Plant air system pressure
less
than
87 psig
High cooling water temperature
through each air compressor
Status of the standby air compressors
and air dryer
High moistut e content
downstream of air dryers
In order to ensure that oil, water, or other impurities will not
result in the failure of instrumentation
or other equipment,. the
compressed air system is provided with oil-free compressor
cylinders, filter separators,
an air dryer,
and
3 micron filters.
The inspector determined that the air receiver high moisture alarm
is tested
under loop test 25-9E.
It is in the recurring task
scheduler
and was last calibrated
May 9,
1987 under work order
C13161.
The inspector
concluded that the direction of slope of the air
supply lines at the
AOVs does not pose
a problem with respect to
moisture in a dried air system
as long as the system is operated
and
maintained
as designed.
There should
be essentially
no moisture in
a dried system
and increasing moisture content in the system is
alarmed in the control
room.
Intrusion of moisture into a positive
pressure
system is highly unlikely.
However, this item remains
open pending
an inspection
by the
resident
inspectors
in the areas of operation
and maintenance.
resident
inspectors
findings will be reported in a subsequent
inspection report.
The
0 en
50-275/323/87-01-06
Resolution of Backlo
of Action Re uests
~ARs).
The review of the licensee's
corrective actions to remedy this
deficiency were
commenced
during this inspection
by examining the
readiness
for restart
program (Unit 2); task force meeting
on
improving PIN's system
dated April 4, 1987;
AR type codes
and other
documents
related to the
AR backlog problem.
However, inspection in
this area is incomplete at this time and shall
be continued during a
future inspection.
No violations or deviations
were identified.
The inspector
conducted
an e'xit meeting
on October 9, 1987, with the
members of the plant staff as indicated in paragraph
1.
- During this
meeting,
the inspector
summarized
the scope of the inspection activities
and reviewed the inspection findings as described
in this report.
The
licensee
acknowledged
the concerns identified in the report.
~
'