IR 05000313/1979020
| ML19260A231 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/24/1979 |
| From: | Beach A, Randy Hall, Westerman T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML19260A228 | List: |
| References | |
| 50-313-79-20, 50-368-79-18, NUDOCS 7911080204 | |
| Download: ML19260A231 (7) | |
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U. S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT
REGION IV
Report No. 50-313/79-20 50-368/79-18 Docket No. 50-313 License No. DPR-51 50-368 License No. NPF-6 Licensee: Arkansas Power and Light Company P. O. Box 551 Little Rock, Arkansas 72203 Facility Name: Arkansas Nuclear One (ANO), Units 1 and 2 Inspection At: ANO Site, Russellville, Arkansas Inspection conducted: September 4-5, 1979 9/2dl!79 Inspector:
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A. B. Beach, Reactor Inspector, Engineering
Date Support Section
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Reviewed by:
7 7, /d //h Ar 9[JV/7f W. D. Johnson, Resident Reactor Inspector Date Approved by:
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T. F. Westerman, Chief, Reactor Projects
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R.' E. Hall / Chief, Engineering Support Section
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Inspection Sumary Inspection on September 4-5, 1979 (Report No. 50-313/79-20, 50-368/79-18)
Area Inspected: Routine, announced inspection of licensee actions taken in response to IE Bulletin 79-02. The inspection involved thirteen inspector-hours on-site by one NRC inspector.
Results:
In the area inspected, no items of noncompliance or deviations were noted.
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DETAILS SECTION 1.
Personnel Contacted
- C. A. Halbert, ANO Mechanical Engineering Supervisor
- J. W. Anderson, AND Acting QC Supervisor
- M. R. Redford, Bechtel, Resident Engineer
- P. C. Daellenbach, Bechtel, Senior Field Engineer
- R. E. Cameron, Bechtel, Project Field Engineer
- Present at the exit interview.
In addition to the above technical and supervisory persone.el, 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 a.
Review of Testing and Repair Procedures - Unit 1 The IE inspector reviewed the follwing procedures for fulfilling requirements of NRC IE Bulletin 79-02, dated March 8, 1979, for Arkansas Nuclear One, Unit 1:
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Specification 11406-276-4, Revision 0: Procedure for identifying concrete expansion bolts for pipe supports Specification 11406-276-5, Revision 1: Procedure fo'r inspection and testing concrete expansion bolts for pipe supports Specification 11406-276-8, Revision 0: Statistical sampling program to test concrete expansion bolts for pipe supports Specification 11406-276-4 establishes the requirements for the identification of concrete expansion anchor bolts which are to be inspected and tested as selected from the statistical sampling program.
Specification 11406-276-5 specifies the method for performing and documenting concrete expansion bolt inspections.
The inspection requirements included torque testing to ensure that the installation torque on the bolt has accomplished the purpose of setting the wedge. Since the licensee does not take credit for bolt preload, in accordance with the criteria established in the licensee's response to IE Bulletin 79-02, no correlation between torque and '
tension values were used in the torque verification program:
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Anchor Size (in.)
Wej-it (ft. lbs.)
Self-drilling (ft. lbs.)
1/2
30 5/8
40 3/4
65 7/8 105
1 150 130 1 1/8 260 240 1 1/4 260 240 1 1/2 330 310 The torque test was considered to be successful if the torque was achieved in two turns or less of the nut. Minimum allowable slippage is 1/16".
The IE inspector reviewed the 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 inspection are:
(1) Stud length or anchor length (2) Stud diameter or bolt diameter (3) Stud projection (Wej-it)
(4) Anchor shell to plate distance (Shell)
(5) Thread engagement (6) Damage to existing concrete surrounding the support plate (7) Actual hanger and support plate installation conformance to the hanger sketch Specification 11406-276-8 established the procedural requirements which determined which concrete expansion bolts were to be inspected.
The sampling technique developed in this procedure was performed prior to the receipt of IE Bulletin 79-02, Revision 1; thus it was a random sample on a plant basis versus a system basis. However, the statistical sample included hanger supports of various sizes and configurations at different elevations and locations. Ninety-two concrete expansion bolts were torque verified and' inspected in the Unit 1 Containment Building, with thirty-one being torque verified and inspected in the Unit 1 Reactor Auxiliary Building. Thirty-one
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additioncl hanger support plates with a safety factor less than three but greater than two, achieved a total torque verification consistent with all the concrete expansion bolts in the hanger base plate.
Only one concrete expansion bolt of those tested failed the torque testing portion of the program. However, the 95% ccafidence level required by IE Bulletin 79-02 that "as built" pipe support drawings be correct could not be demonstrated at the time of this inspection.
Licensee and contractor personnel stated to the IE inspector that it is their intention to incorporate this port. ion of the inspection with their field inspection efforts in response to IE Bulletin 79-14.
This aspect of this inspection will be completed during a subsequent inspection, after the licensee completes testing sufficient to dem-onstrate the 95% confidence level criteria.
Specification 6600-C-2305, " Specification for Installation of Class 1 and Non-Class 1 Concrete Expansion Anchors," was subsequently reviewed.
This specification establishes installation, verification and testing acceptance criteria for any concrete expansion bolts which must be installed as a result of the field inspection effort or as a result of the analysis performed in response to IE Bulletin 79-02.
b.
On-site Observation and Record Review - Unit 1 At the time of this inspection, the torque verification portion of the field inspection program had been completed. Selected documentation of the testing and inspection program was reviewed by the IE inspector.
Specifically, the following four field inspection packages were reviewed:
Field Inspection Report File No. BWR1-79-194, Tag No. 12 Field Inspection Report File No. BWR1-79-194, Tag No.15 Field Inspection Report File No. W R1-79-194, Tag No. 35 Field Inspection Report File No. BWR1-79-261, Tag No. 57 The documentation was reviewed for test results, the date of test, and the signature of the inspector.
Inspection activities were discussed with the field personnel; specifically, torquing procedures, ultrasonic testing methods for determining stud length of the WEJ-IT anchors, and the methods used to acquire the measurements necessary to accomplish the requirements of the inspection procedure were explored. All documentation reviewed and all field activities observed were found to be in accordance with Specification 11406-276-5, evision 1.
Repair documents for the two following hangers were reviewed:
Hanger HPO-38-416, File Number BWRI-79-273
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Hanger 2-HBC-34-H7, Hanger Drawing H7, Rev. 5, F3 (Unit 2)
Repat;; were made to bring the bolt loads to an acceptable level as required by IE Eulletin 79-02. All documentation reviewed indicated repairs were made in accordance with Specification 6600-C-2305.
c.
Review of QC Documentation - Unit 2 The licensee stated in their response to IE Bulletin 79-02 that sufficient documentation exists for Arkansas Nuclear One, Unit 2 to verify that design requirements have been met for the installation of concrete expansion bolts in each base plate.
Hanger 2-H-BC-43-H-3 and hanger 2-H-BC-43-H-5 were randomly selected by the IE inspector, and documentation of the installation and inspection methods were reviewed.
The requirements established in Procedures 2FI-129, " Field Instruction for Installation of Class 1 Concrete Expansion Anchors," and Specification 6600-C-2305, " Specification for Installation of Class 1 and Non-Class 1 Concrete Expansion Anchors,"
were verified in the review of the documentation. The following records for hanger No. 2-H-BC-43-H-3 (Brass No. 209s*) and 2-H-BC-43-H-3 (Brass No. 2097*) were reviewed:
Hanger Installer Ccrd Expansion Anchor Installer's Report Expansion Anchor Test Report Concrete Expansion Anchor Qualification Record All documentation reviewed was in accordance with the requirements of Procedures 2FI-129 and Specification 6600-C-2305.
Stress walkdown books were then reviewed. Bechtel engineers and field engineers had completed an inspection on these hangers on March 14, 1978, and April 23, 1978, as indicated by M-2687, Sheet 13, Revision 5.
Thus, based on the documentation reviewed, adequate QC documentation apparently exists for the installation of the concrete expansion bolts by the criteria established in the licensee's response.
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- The identification of the qualified installer of the concrete expansion bolts is indicated as a brass number.
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3.
Exit Interview The IE inspector met with licensee representatives (denoted in paragraph 1)
at the conclusion of the inspection September 5,1979. The IE inspector sumarized the scope and findings of the inspection.
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