ML19276H520
| ML19276H520 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 10/23/1979 |
| From: | Randy Hall, Kelley D, Westerman T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML19276H517 | List: |
| References | |
| 50-285-79-13, NUDOCS 7911290048 | |
| Download: ML19276H520 (5) | |
See also: IR 05000285/1979013
Text
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U. S. NUCLEAR REGULATORY C0dD11SSION
OFFICE OF INSPECTION AND ENFORCEMENT
REGION IV
Report No. 50-285/79-13
Docket No. 50-285
License No. DPR-40
Licensee:
Omaha Public Power District
1623 Harney Street
Omaha, Nebraska
68102
Facility Name: Fort Calhoun Station, Unit 1
. Inspection at:
Fort Calhoun Station, Blair Nebraska
Inspection Conducted: August 23-24, 1979, and October 11-12, 1979
Inspector:
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B. Beach, R,eactor Inspector, fngineering Support
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Section
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Reviewed:
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D.L.Kelley,Aca[torpspector
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Approved:
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T. F. Westerman, Chief,' Reactor Projects Section
Date
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R. E. Hall, Chief, Engineering Support Section
Date
Inspection Summary:
Inspection on August 23-24, 1979, and October 11-12, 1979 (Report No. 50-285/79-13)
Area Inspected:
Routine, announced inspection of licensee actions taken in
response to IE Bulletin 79-02.
The inspection involved eighteen inspector-hours
on site by one NRC inspector.
'lesults:
In the area inspected, no items of noncompliance or deviations were
noted.
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DETAILS
1.
Personnel Contacted
Licensee Personnel
- M. E. Eidem, Manager, GSE Mechanical
- B.
J. Hickle, Licensing Administrator
- R. L. Jaworski, Technical Services Manager
- D. S. Lucis, Mechanical Engineer, GSE Mechanical
Other Personnel
- D. J. Watson, Site Manager, Gilbert Commonwealth
- Denotes those present at the exit interview.
In addition to the above technical and supervisory personnel, the IE
inspector held discussions with various maintenance, operations, technical
support and administrative members of the licensee's staff.
2.
Licensee Actions Taken in Response to IE Bulletin 79-02, Revision 1
a.
Review of Testing and Tnspection Procedure
The IE inspector reviewed special procedure SP-Anchor-1, " Inspection /
Testing of System Support Base Plates Using Concrete Expansion Anchor
Bolts."
This procedure establishes the inspecticu and testing require-
ments of seismic Category I system support base plates that use concrete
expansion anchor bolts.
The licensee initiated his testing and sampling program based on the
suggested procedure of IE Bulletin 79-02 of testing one bolt per base
plate. These base plates were selected from a representative sample
of all seismic Category I systems.
This representative sample in-
cluded the Feedwater, Raw Water, Safety Injection, and Auxiliary
Coolant systems. A testing and sampling program is currently in
progress to include those seismic Category I systems not included in
the representative sample.
This statistical sample is to provide a
95 per cent confidence level that less than 5 per cent defective
anchors have been installed in any one seismic Category I system on
a system by system basis.
The testing program has been developed for Phillips Red-Head Shell
and Stud type anchors. The testing portion of the procedure verifies
that anchor bolt preload is equal to or greater than bolt design load.
Proof loads and excess proof loads established in the procedure SP-
Anchor-1 are as follows:
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Red-Head Shell Type
Catalog No.
Proof Load ( }
Excess Proof Load (
S14
734
918
S16
812
1015
S38
1134
l'18
S12
1700
2125
S58
2340
2925
S34
3240
4050
S78
3570
4463
Red-Head Stud Type
Catalog No.
Proof Load ( }
Excess Proof Load ( }
JS38
710
888
JS12
1040
1300
JS58
1420
1775
JS34
2220
2775
(1) Manufacturer's pullout load /5; thus, proof load x 5 =
manufacturer's pullout load
(2) Manufacturer's pullout load /4; thus, excess load x 4 =
manufacturer's pullout load
The concrete expansion anchors are tested to the excess proof load
if the plug depth for shell type anchors and if the embedment depth
for stud type anchors are not within the procedural acceptance
limits. However, acceptance criteria for these anchors after the
test load is applied is as defined in the procedure for the proof
load requirements.
The IE inspector reviewed procedural requirements for verification
by inspection that the concrete anchor bolts are properly installed
and are of the specified size and type. Among the parameters to be
included in the licensee's inspection are:
(1)
support number and support drawing number
(2)
sketch and orientation of base plate being inspected
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.
(3)
fastener type and identification number
(4)
bolt type, bolt diameter and bolt hole diameter
(5) washer installation
(6) as-found torque and reinstallation requirements
(7)
stud anchor length and emLm ment depth
(8)
thread engagement and depth of plug minimum and maximum allowed
for shell anchors
(9)
anchor shell to plate distance for shell anchors
All existing expansion anchors which are to be replaced will be
replaced with Hilti Wedge-type anchors. All anchors which are to
be used in a new location will likewise be "ilti Wedge-type anchors.
At the time of this inspection, qualification tests were being per-
formed at the site on the Hilti Wedge-type anchors to establish
proper installation torque requirements for these concrete anchors.
All of the concrete expansion anchors which do not meet the pro-
cedural acceptance criteria will be replaced. All of the base
plates with those concrete expansion anchors which do not meet the
safety factor of five criteria established by IE Bulletin 79-02,
Revision 1 by the analysis method will be repaired immediately if
the analysis indicates a safety factor less than two.
If the anal-
ysis indicates that there is a safety factor greater than two, but
less than five, a pull test to the design load of all of the con-
crete anchor bolts in that particular base plate will be conducted.
Repairs to that base plate are based on the results of the pull
test.
b.
Work Observation
The IE inspector observed activities relative to field inspection
and testing procedures for Support No. FPS-16 and Support No. CHVS-25.
Ultrasonic testing methods were observed for Support No. FPS-16 and
these methods were discussed with the licensee personnel performing
the ultrasonic testing. Calibration data for UT Instrument No.
NDT-131-089, Torque Wrench T-20, and Load Cell No. HWID-07154A were
found to be current at the time of this inspection.
Field inspection activities were observed and completed inspection
activities were reviewed from existing documentation. The IE
inspector confirmed that a QC verification had been incorporated
into the testing and inspection procedures and activities. All
activities observed and all documentation reviewed were in accordance
with SP-Anchor-1.
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3.
Exit Interview
The IE inspector met with members of the licensce's staff at the
conclusion of the inspection.
The scope of the inspection and the
findings were discussed.
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