ML16340B961
| ML16340B961 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 07/22/1981 |
| From: | Bishop T, Burdoin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML16340B962 | List: |
| References | |
| 50-275-81-17, 50-323-81-11, IEB-79-13, IEB-80-05, IEB-80-5, IEC-80-04, IEC-80-09, IEC-80-10, IEC-80-23, IEC-80-4, IEC-80-9, IEC-81-08, IEC-81-8, NUDOCS 8108180451 | |
| Download: ML16340B961 (12) | |
See also: IR 05000275/1981017
Text
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50-275/81-17
Report
No.
U. S.
NUCLEAR REGULATORY COMMISSION
OFFICE
OF INSPECTION AND ENFORCEMENT
REGION V
Docket No.
Licensee:
P.
0.
Box 7442
License
No.
p
PR-69
Safeguards
Group
F
n i co
Calif rnia
94106
Facility Name:
Di bio
C n on
U its'.
Inspection at:
D abl
an
on Site
San Luis Obis
o Count
8 Cor orate Office
Inspection conducted: June
22-26
1981
Inspectors:
lh- l
J.
F. Burdoin, React
Inspector
y/Zz/Pl
Date Signed
Approved by:
T.
W. Bisho
Chi
Pro ects Section
1
Reactor Construction Projects
Branch
Date
S gne
7/>z/Sl
Date
S gne
Summary:
Ins ection durin
eriod of June
22-26
1981
Re ort No. 50-275 81-17. and
0-323 81-11
~Ad:
d
dd
p
dd
PP
dd
PP
dd
p
of construction
and modification activities including:
licensee action
on previous inspection findings, 50.55(e)
items
and
IE Bulletins and Circulars.
The inspection involved 34 inspector
hours
by one
NRC inspector.
Results:
No items of noncompliance
or deviations
were identified.
8108180451
810723
ADOCK 05000275
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RV Form 219 (2)
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DETAILS
1.
Individuals Contacted
a ~
Pacific
Gas
and Electric
Com an
PGSE
J.
B. Hoch, Nuclear Projects
Engineer
R.
D. Etzler, Project Superintendent
- M. N. Norem, Resident Startup
Engineer
B.
C.
Lew, Nuclear Plant Operations
R.
C. Thornberry, Plant Manager',
W.
B. Kaefer, Tech.: Assist to Plant;Manager
R.
C.
Howe, Senior Nuclear Generation
Engineer
- F; M. Russell; Acting,'Resident Civil Engineer
D.'. Rockwell, Resident Electrical
Engineer
J., g., Aranon,
Resident'- Mechanical
Enginee'r
- R. T.'widdy, gA Supervisor
- S: J.'oat,
gC Engi'neer
K. A.'lee,
gC Engineer
- R. W.'aylor, gA Engineer
- I. L, MacDonald, Acting Resident Electrical
Engineer
Various other Engineering
and
gC personnel.
- Denotes attendees
at June
26,
1981 Exit Meeting.
2.
Plant Tour
Upon arrival at the site the inspector toured the Diablo Canyon Units
1 and
2 to observe
completed work.
Specific areas
examined included
Unit 1 vital switchgear
and onsite
power systems,
the
ECCS systems,
the control
room and the containment;
and Unit 2 containment.
No items of noncompliance or deviations
were identified.
3.
Licensee
Action on 50.55
e
Items
a.
0 en for Unit 2
Deficient Low Level
Am lifiers in the Reactor
Protection
S stem
The licensee
submitted
a final 50.55(e) report, dated
March 9,
1981, regarding defective operation of Hagan
Model
118 low level
amplifiers used in the reactor protection system.
The resolution
of the problem was to replace all 2N699 transistors
in the gl4
location of each
module with 2N4383
(Sprague
TP4384) transistors.
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The inspector determined,
from discussions
with licensee that
all of the replacement transistors
have not been received
on site
to modify Unit 2 amplifiers.
It was also learned that these
modifications in the amplifier modules will be accomplished
concurrent
with maintenance
replacement of electrolitic capacitors
in the
Hagan amplifiers in late
1981 or early 1982.
(Closed for Units
1 and
2
Se aration of Neutral
Block from Neutral
Bus in
1 0
VAC Vital Instrument
Power Panels
The licensee
reported
by telecon
on May 14,
1981 that the neutral
terminal block became
separated
from the panel
ground
bus in
the
120
VAC vital instrument
power panel
no.
PY13 for Unit l.
Once separated
the
120
VAC circuits in this panel
were open-circuited
causing the devices
powered from this panel to become deenergized.
A preliminary written report was submitted
on June
12,
1981.
The licensee
proposed to replace the neutral
blocks in all eight
(four per unit)
120
VAC vital power panels with neutral
blocks
of an improved design.
The installation of the new neutral
blocks
in the seven of the eight vital 120
VAC power panels
was completed
June
24,
1981.
Completion of the eighth unit in panel
PY24 (Unit 2)
is awaiting delivery of standoff insulators.
The inspector
examined
the design for the
new neutral
blocks
and verified that seismic
review and design verification had been accomplished.
The 120
VAC vital power panels
were inspected
following installation
of the neutral
blocks to ensure
the work was completed.
This item is closed for Units
1 and
2 upon receipt
and examination
of licensee's
final written report.
(0 en for Units
1 and
2
Deficienc
in Containment
S ra
Pum
Startinq
The li'censee
submitted
a preliminary 50.55(e) report,
dated January
19,
1981, which concerns 'spray
pump start timing.
The concern
is the simul'taneous
starting of the,;containment
spray
pumps initiated
by high-high containment
pressure
(P)-'signal with other
ESF equipment
initiated by the safety injection (S) 'signal.
This could result
in the'ripping of an emergeiicy
bus
and the loss of ESF functions
following a
LOCA.
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The inspecto'r reviewed the present'tatus
of this issue with the
licensee.
'The issue is under re-evaluation
by the licensee's
engineering
department
and the
NSSS" manufacturer
to determine the proper assumptions
and solutions.
'A solution/
conclusion for this issue will be forthcoming in the near future.
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Crackin
in Heav
Ru ture Restraints
see
IE Ins ection
Re ort No. 50-275 50-323 81-04
e.
The inspector reviewed this issue for Unit 2 with the licensee.
The repair work (reported approximately
60Ã complete in March
1981)
has
been inactive.
However, recently the repair work of
fractured restraint weldments for Unit 2 was restarted
and is presently
going forward.
j
0 en for Unit 2
Reduced
Ultimate Tensile Values for One-Inch
Hilti Ex ansson
Anchors
see
Ins ection
Re ort No. 50-275 81-10)
The inspector reviewed this issue for Unit 2 with the licensee.
The re-evaluation of pipe supports for large bore pipe (2', inch
diameter
and larger) is being conducted
by the licensee's
engineering
department
in,San Francisco while the re-evaluation of pipe supports
.
for small
bore pipe is being conducted
by the Field Engineering
Section at the Diablo Station.
4.
Licensee
Action on IE B'ulletins and Circulars
The following IE Bulletins and Circulars were reviewed
by the inspector
to determine the thoroug)ness of licensee
actions to correct or avoid
those
known or potential deficiencies:
1 '8
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a.
(0 'en. for "Unit.2 -IE.,Bulletin 79'-13:
Crackin
in Feedwater
Pi in
b.
C.
~Sstem
Thee" inspe'ctor
r eviewed 4hi's bul:le'tih"with the licensee.
The
,"li'cen'see'isI co'mmÃted~to"csomplete<aii, jnspection
program following
h'o'er functus'onal'testing
tentati ve'ly 'scheduled
for December
1981.
(Clo'sed fo'.'Unit 2) IE',Bulletin'80-05:
Vacuum Condition
esu,
sng
sn
amage
o
o
up.
an
s
Th'e:inspector exami'ned"theeinstall'ations
of the external
stiffen'ing rings
and the,,vacuum r'elief valves which adequately
< protects'"the
holdup tanks
'from'damage" due to vacuum conditions.
The installations
were found to be satisfactory.
Closed for Units'
'and
2
IE Circular 80-04:
Securing of
Threaded
Lockin "'Devices
on
Sa et -Re ate
u)pmen
The licensee
has demonstrated
to the inspector's
satisfaction
that the modifications to various pieces of equipment required
by the Circular have
been accomplished
at th'e Diablo Canyon
Station where applicable.
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(0 en for'Unit's '1
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and.2
". IE Girc'ular. 80-09: ",Problems with Plant
e.
Internal
Communicati'onS
stem
The inspector'ev'ieyed
this circular with the licensee
and
determined that additional, testing ofthe,effects of portable
radio transmission',on
c'on'trol'oom instr'umentation is still
going forward.,; -.-
0 en for..Units l..and
2
IE Curcular
80-'10:
Failure'to Naintain
Environmental
ual ificati on
The wrong class of insulating'material
had been
used in reconnecting
motor leads following maintenance
at the H.B. Robinson Nuclear
Plant.
The inspector reviewed this Circular with the licensee
and determined that the maintenance
procedure,
which will
monitor this issue
once the plant becomes
operational,
has
not been
completed at this time.
Closed for Units
1 and
2 'E Circular 80-23:
Potential
Defects
in Beloit Power
S stems
Emer enc
Generators
The licensee's
review of the electrical
equipment records
has
determined that no generators
manufactured
by Beloit Power
Systems
are used in Class
I application at Diablo Canyon Units
1
and 2.
g.
0 en for Units
1 and
2
IE Circular 81-08:
foundation Materials
Insufficient compaction of foundation
and backfill materials
during the construction of nuclear plants
has resulted in
excessive
settlement of plant structures
at
a number of sites.
The inspector reviewed this circular with the licensee.
It
has
been determined that the containments
and most of the
station buildings rest
on bedrock
and that only a limited
amount of backfill and compaction
was required in the area of
the station buildings.
There is
some backfill in the turbine
building area
and diesel
generator
areas.
Hajor backfilling
and compaction
was required in the
230 and
5QQ
KV switchyard
areas.
The compaction of backfill in the turbine area for Unit
1 was
accomplished with hand pneumatic
compactors.
Unit 2 construction
period was later and by that period backfilling in the turbine
area (Unit 2) was being accomplished with concrete
(2000 psi).
The instructions/specifications
for compaction
were reviewed
a1ong
with compaction records for the turbine building.
Compaction
tests
were made after each
6 to 8 inch liftof compacted backfill.
If compaction
was less
than
90%, the area
was
removed
and backfilled/
compacted with new material.
Bench marks inscribed at various locations
on the turbine building and monitored periodically during construction
did not indicate any appreciable
settlement "o5 .the=-bui'fding.
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In the switchyard areas,
the backfilling and compaction
was
accomplished
early in the construction period.
The area
was
monitored for settlement for approximately
two years after
backfilling was completed before
any construction
was
commenced
on the sites.
The compaction
procedures
and records for the
switchyard areas
were reviewed
and no deviations
were identified.
The inspector's
audit of records
on this issue is incomplete
at this time.
This item will remain open.
5.
Mana ement Interview
The inspector
met with licensee
representatives
(denoted in Section
1)
on June 26,
1981.
The scope of the inspection
and the inspector's
findings,
as noted in this report, were discussed.
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