ML17056A243
| ML17056A243 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/15/1989 |
| From: | Anderson C, Paolino R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML17056A242 | List: |
| References | |
| 50-220-89-17, IEIN-86-053, IEIN-86-53, NUDOCS 8908300015 | |
| Download: ML17056A243 (16) | |
See also: IR 05000220/1989017
Text
U.S.
NUCLEAR REGULATORY COMMISSION
REGION I
Report
No.
50-220/89-17
Docket No.
50-220
License
No.
Priority
Category
C
Licensee:
Nia ara
Mohawk Power Cor oration
301 Plainfield Road
S racuse
13212
Facility Name:
Nine Mile Point Unit
1
Inspection At:
Salina
Meadows
Cor orate Office
Inspection
Conducted:
June
12-16
1989
Inspector:
R. J.
aolino, Senior Reactor Engineer,
PSS/EB
date
Approved by:
C. J
Anderson,
Chief, Plant Systems
Section,
EB/DRS
date
Ins ection Summar:
Ins ection of June
12-16
1989
Ins ection
Re ort
/
Areas Ins ected:
Special
announced
inspection
by regional
personnel
of
licensee activities in response
to Information Notice 86-53 regarding
Raychem
Heat Shrinkable
Tubing.
Review and closeout of previously identified open
items.
Results:
Two potential violations were identified regarding
equipment
qualification of splice assemblies.
Three previously identified open
items were closed.
One unresolved
item was identified involving the
qualification of Raychem splice materials
used with Endevco accelerometers.
Details
1.0
Persons
Contacted
1. 1
Nia ara
Mohawk Power Cor oration
G. Brownell, Regulatory
Compliance
Engineer
W. D'Angelo,
Manager
M. Dooley, Regulatory
Compliance
Engineer
C. Fischer, Electrical Maintenance
J. Janas,
Lead,
QAE Electrical
J. Jirousek,
Manager
EQ Programs
K. Johnson,
Generation
Engineer
M. Mosier,
Lead Engineer
Safety Analysis
G. Sanford,
Regulatory
Compliance
Engineer
K. Sweet,
Maintenance
Superintendent
J . Willis, General
Superintendent
1.2
Consultants
G. Eldridge,
EQ Engineer
Gasser
Associates
L. Price,
EQ Engineer - Gasser
Associates
E.
Schum,
Senior Engineer - Wyle Test Laboratory
W. Shaffer, Utility Regulatory Support Associates
1.3
U. S. Nuclear
Re viator
Commission
W.'ook, Senior Resident
Inspector
Denotes
personnel
not present at exit meeting of June
16,
1989.
2.0
~Pur ose
The purpose of this inspection
was to:
1) review and evaluate
licensee
activities in addressing
NRC information notice 86-53 regarding
"improper
Installation of Heat Shrinkable Tubing" and,
2) review status
of
previously identified open
items
and close out those
items which have
been corrected.
3.0
~Back round
Several
licensees
discovered
in 1986 that
a substantial
amount of Raychem
cable splices installed previously at their facilities did not conform to
vendor's installation requirements
in one or more of the following ways;
~
Improper sizing of splice diameters.
~
Improper overlap
seal
length
on wire insulation.
.
3
~
Use of Heat Shrink tubing directly'over fabric braiding or wire.
~
Improper bending of heat shrink tubing placed in junction boxes
and
motor lead enclosures.
On June
26,
1986 Information Notice 86-53 was issued to alert licensees
to this potential generic safety problem and to inform them to consider
appropriate
actions, if applicable,
to prevent similar problems at their
facilities.
4.0
Licensee Action
In response
to the
NRC Information Notice 86-53, the licensee
issued
a
memo (file code
1070W) dated April 1,
1988 documenting the
NMPC Eg
response
to the issues
raised
by the IE Notice 86-53.
For Unit 1,
a training seminar
was conducted
by Raychem to demonstrate
the techniques
involved in correctly applying the various types of
Raychem
Heat Shrink Tubing.
Instrumentation
and Control
and Electrical
maintenance
personnel
performed several trial runs installing Raychem
splices.
Subsequent
to the installation of any
Raychem at NMP-1, in an
Eg applica-
tion, plant procedures
Nl-EMP-44.2, Nl-EMP-44.22 and Nl-IMP-OICS were
revised to provide installation instructions for field installation of
Raychem splices.
The licensee
concluded that the site procedures
S-EMP-GEN-003
and the
action taken to date,
address
the concerns
5.0
Ph sical
Walkdown
The
NRC inspector
performed
a walkdown and visual inspection of select
Eg
equipment splices.
Specific equipment
examined included:
Pump Motor No. PB-102,
Equipment
No. M81-51
Rosemount transmitter
Nos.
FT-201.8-68
and FT-201.8-69
Asco Valve No. 201.7-11
Electrical Penetration
Nos.
X-E198B, X-E199 (all), X-E200U, E-E201J
and X-E202G,H.
Endevco Accelerometer
Nos.
FT-66-19 thru FT-66-24.
In examining the
Rosemount transmitter
and Asco Valve electrical splices,
the inspector
noted that the splice configuration was not per the
instructions
(Nl-EMP-44.2) in effect at the time of installation.
The
Nl-EMP-44.2 procedure
specifies
an in-line splice with two half-lapped
layers of T-95 tape covered with one half-lapped layer of T-35 tape.
The
installed configuration consisted of three parallel wires bolted (termi-
nated) at one with T-95 tape
randomly wrapped
around all three wires.
Standard
PVC electrical
tape
was
added
as
a protective cover.
No attempt
was
made to seal
the area
between the three parallel wire leads.
e
The test Report
(Wyle Laboratory Test Report 17722-1)
on which qualifi-
cation of the Rosemount Transmitter
and Asco Valve electrical splice is
based
does
not address
the installed configuration.
In addition, it
differs from the engineering
approved instructions
specified in Nl-EMP-44.2
for electrical in-line splices.
The Wyle Test Report states that the
applicable test
specimens
( Items 3-1 and 3-2)
have
two half-lapped layers
of T-95 tape
and
one half-lapped layer of the T-35 tape.
A 2nd layer of
the jacketing tape
was
used in the test to cover the spliced area
and
approximately
one inch over the cable jacket.
The procedure
Nl-EMP-44,2
does not require the 2nd layer of the jacketing tape.
A review of the
quality control
(QC) inspection
records indicate the splices
were completed
in November 6,
1984 against
Work Request
No. 29688.
The
QC Report No.
84-1315,
step 7.3 which specifies
compliance with Procedure
Nl-EMP-44.2
configuration contained
QC approval of the installed splice.
Discussions
with licensee craft and supervisory
personnel
involved in the
splice installation at the time indicate approximately
905 of splices
were done in this manner.
Prior to the
end of this inspection,
the licensee
was able to procure
a
proprietary test report that qualified
a test
specimens
similar to the
NMP-1 installed configuration.
Preliminary review of the test report
(Wyle Laboratory Test Report 17947-01) indicates qualifiability of test
specimens
having two parallel wires bolted (terminated) at one
end with
I-95 tape applied in half-lapped layers.
Tlute NMP-1 configuration
uses
three parallel wires bolted at one end.
In addition, test photographs
in
the report indicate splices
were held in a vertical position (open
end
down)
so that moisture would not accumulate
in the area of the bolted
termination.
During
a licensee
telephone
conversation with NRC personnel
on August 7,
1989,
the licensee
indicated that they had additional
information to support qualifiability of the subject splices.
The
licensee
agreed
to send this information to the
NRC for review.
Furthermore,
the licensee
agreed that before restart they planned to
upgrade
the deficient splices.
This item is
a potential violation of 10 CFR 50.49 which requires
the qualification of electrical
equipment
subject to
a harsh environment (50-220/89-17-01).
An inspection of electrical
Nos.
X-E198, X-E199, X-E200,
X-E201 and X-E202 (elevation 252'0") revealed
several
deficiencies involv-
ing the
D.
G. O'rien cable/connector
assemblies.
The D.
G. O'rien
cable/connector
assembly
uses
a polyurethene filler to fill all voids
between
the cable
and the connector
and
a Raychem preformed boot shrunk
over the assembly
to complete
the moisture seal.
During this inspection,
and in the company of licensee
representatives,
the inspector observed
D.
G. O'rien cable/connector
assemblies
without the preformed boot,
assemblies
covered with Raychem In-line heat shrink tubing instead of the preformed
boot, preformed boots that appeared
to be slipping off the cable/connector
assembly
and preformed boots sized for single cable/connector
applications
being used with 3 and
6 cables
per connector.
gualification of the
Raychem preformed boot used over metal
surfaces
was
not established.
Documents
reviewed
by the inspector consisted
of
analysis
performed
by Wyle Laboratories of existing
Raychem reports
on
Heat Shrink tubing,
none of which address
the
use of Heat Shrink tubing
over metal
surfaces
in a harsh
environment.
At the time of the inspection, it was not determined
how many of the
deficiencies
applied to
Eg related circuits,
however,
the licensee
had
agreed
to inspect all electrical
prior to start-up to
determine
the extent of the deficiencies
and applicability to Eg related
circuits.
Test Reports
reviewed for this determination
include:
~
Wyle Test Report
No. 17655-1, revision
C dated January
23,
1986
~
Wyle Test Report
No.
17655-1. 1, revision
D dated January
23,
1986
~
Wyle Test Report
No. 17655-1.2,
revision
B dated January
24,
1986
~
Patel
Engineering
Report
No. PEI-TR-82-12-101
dated
September
28,
1982
~
D.
G. O'rien Report
No. ER-268, revision
A dated
May 24,
1979
~
D.
G. O'rien Report
No.
ER-330 revision
N/C dated
November 17,
1983
The D.
G. O'rien Report
No.
ER-330 was
an assessment
of Raychem Test
Report Nos.
EDR-5008 (adhesive
coated
Heat Shrunk Tubing),
EDR-5011
(Splice
on Hypolon wire) and
EDR-5021 (Nuclear Grade Adhesive-S1119).
None of the above reports
address
the
use of Raychem
Heat Shrinkable
tubing/materials
over metal
surfaces
located in harsh
environments.
During a licensee
telephone call with NRC personnel
on August 7,
1989,
the licensee
provided the results of their follow up inspection of all
D.
G. O'rien cable/connector
assemblies
used at Nine Nile
1 in areas
requiring equipment qualification for harsh environments.
Sixty-three
assemblies
are installed at Unit 1.
Seventeen
of these
assemblies
contain
a total of forty plugs requiring equipment qualification.
Deficiencies
were observed in only one of these
plugs.
The deficiency consisted of
incomplete installation including failure to shrink the sleeve
and failure
to install the potting compound inside the heat shrink.
The licensee
has
contacted
the manufacturer to initiate repair of the assembly before
restart of the Unit on August 22,
1989.
The licensee
committed to
complete the repair before Unit 1 startup.
The licensee
specified that
a Wyle report was obtained that demonstrates
that the assembly
would have performed its function despite
the presence
of the installation deficiencies.
The licensee
has also obtained
information to support the qualification of Raychem
HST splice seals for
metal
surfaces.
The licensee
agreed to send this information to the
NRC
for review.
This item is
a potential violation of 10 CFR 50.49 which
requires
the qualification of electrical
equipment subject to a harsh
environment (50-220/89-17-02)
.
During the walkdown in the drywell, the inspector
observed
several instal-
lations of the Endevco Accelerometer
(FT-66-19 thru FT-66-24).
An in-line
Raychem
WCSF-N splice
was
used to seal
the accelerometer
connector
assembly
against moisture intrusion.
The Raychecm
WCSF-N Heat Shrinkable tubing
was applied directly over metal
surfaces.
Data which clearly establishes
use of Raychem
WCSF-N Heat Shrinkable Tubing (HST) over metal
as
a method
for obtaining
a qualified moisture
seal
in a harsh environment
was not
available.
The Wyle Assessment
Report
( 17655-CON-1) for qualifying hardline cable to
hardline cable contained
a
number of discrepancies
as follows:
~
The qualification test data did not demonstrate
that the equipment
being tested satisfied the acceptance
criteria through all phases
of
testing.
The thermal
aging analysis
was
used
on temperatures
less
than for
NMP-1 normal service temperatures.
The Units, which are installed without enclosures,
were subjected to
a simulated
LOCA in
a Hoffman enclosure.
This item is unresolved
pending
NRC review of licensee
evaluation
and
analysis
to suppor.
use of Raychem
HST splice materials
as moisture seals
for metal
surfaces.
(50-220/89-17-03)
6.0
Status of Previousl
Identified 0 en Items
~
Closed
0 en Item 220/85-13-08 pertaining to long term
Eg program
to update
NMP-1 equipment qualification required maintenance
require-
ments for instrument
and control procedures.
Nine Mile Point Unit
1
has
completed this effort to include
Eg maintenance
requirements
in
IEC and Electrical
procedures.
Licensee
memo of May 15,
1986 (file
code
16982)
documents
the procedures
that have
been revised to
incorporate
the
Eg maintenance
requirement.
Licensee
memo of
January
2,
1987 (file code
NMP 21700)
documents
the verification of
the completion of the commitment to the
NRC,
made in C.
V. Mangan's
March 3,
1986 letter to the
NRC concerning this subject
and its
completion
by December
31,
1986.
This item is closed.
~
0 en
0 en item 220/85-13-09 pertaining to closed
loop cooling
motor oil spillage.
The licensee
had proposed
two steps
to provide
corrective action to prevent recurrence
of the oil over. flow
spillage,
1) instruct maintenance
personnel
not to overfill during
the lubricating maintenance,
2) adjust
lube oil filler level
such
that any overfilled oil will be drained to the filler pan.
The
licensee
has completed action
on item one above.
Item 2 has not
b'een
addressed.
During
a walkdown inspection of the motors the
NRC
inspector
noted that one of three motors
had
been
replaced.
The
other two motors, still showed evidence of oil spillage.
The licensee
has not determined
the cause
of oil spill.
A work,request
and
153281) dated
June
15,
1989
has
been
issued to investigate
and
repair the leak.
This item remains
open.
~
Closed
Unresolved
item 220/86-05-01 pertaining to qualification
status of Limitorque jumper wires.
The licensee
inspected all
Eg
MOV's and
removed all jumpers that were not identifiable as
Raychem
Flamtrol or Rockbestos
Firewall III. All jumpers that=were
removed
were replaced with qualified wiring.
The unknown jumpers were sent
to Wyle Laboratories for evaluation
and reported to
NMPC in Report
No.
17655-JMP-1.
Chemical
composition analysis
was performed to
establish qualification of the
unknown material.
This item is closed.
~
~Closed
Violation 220/86-05-02 pertaining to the field identified
Kerite cable for which an
Eg file was not'stablished
and that were
not listed
on the Eg'master list.
The licensee
has established
an
Eg file from existing documentation
which identifies and qualifies
the Kerite Model
HTK and the model
FR FRII cables.
Both cables
have
been
added to the master list.
Compliance
was completed April 18,
1986.
This item is closed.
7.0
Unresolved
Items
Unresolved
items are matters
about which more information is needed to
ascertain
whether the item is acceptable
or a violation.
Unresolved
items are discussed
in Details,
paragraph
4.0.
The inspector
met with licensee
representatives
on May 26,
1989.
The
scope of the inspection
and the inspection findings were discussed
at
this meeting.
The licensee did not identify as proprietary any of the
material
provided to or for review by the inspector during this
inspection.
At no time during this inspection
was written material
given to the
licensee
or his representatives.