IR 05000266/1979008
| ML19259C819 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 06/21/1979 |
| From: | Gallagher E, Hayes D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML19259C817 | List: |
| References | |
| 50-266-79-08, 50-266-79-8, 50-301-79-10, NUDOCS 7908150232 | |
| Download: ML19259C819 (5) | |
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT
REGION III
Report No. 50-266/79-08; 50-301/79-10 Docket No. 50-266; 50-301 License No. DPR-24; DPR-27 Licensee: Wisconsin Electric Power Company 231 West Michigan Milwaukee, WE 53201 Facility Name:
Point Beach Nuclear Plant, Units 1 and 2 Inspection At:
Point Beach Site, Two Creeks, Wisconsin Inspection Conducted: June 12-14, 1979
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Inspector:
E. J. Gallagher
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D.
ayes, Chief Engineering Support Section 1
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Inspection Summary Inspection on June 12-14, 1979 (Report No. 50-266/79-08; 50-301/79-10)
Areas Inspected:
Followup to IE Bulletin 79-02, pipe support base plate designs using concrete expansion anchors; review of test program and procedures; observation of testing anchor bolts and review of quality records.
The inspection involved a total of 12 inspector-hours by one hTC inspector.
Results: No items of noncompliance wre identified in the areas inspected.
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DETAILS
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Persons Contacted Principal Licensee Employees (Wisconsin Electric Power Company)
- G. A. Reed, Manager Nuclear Operations
- A.
L. Reimer, Project Engineer
- J. Greenwood, Assistant Manager Nuclear Operations
- F. Leman, Office Supervisor
- Denotes those in attendance at exit meeting.
Functional or Program Areas Inspected An inspection was performed at the Point Beach Nuclear Plant, Units 1 and 2, in order to followup on licensee actions regarding IE Bulletin 79-02, pipe support base plate designs using concrete expansion anchor bolts.
1.
Status of Licensee's Test Program of Pipe Support Base Plates (Units 1 and 2)
As of the inspection, the licensee had implemented a test program to verify the status of pipe support base plate designs and installa-tions using concrete expansion anchors.
The systems included in the test program were listed in a letter from Bechtel to Wisconsin Electric Power Company dated June 7, 1979, which identified those systems or parts of systems that were seismic Category I.
The list appeared to be comprehensive.
Items brought to the NRC inspector are as follows:
a.
Original anchors were installed without any procedure, inspection or quality control documentation.
b.
Unit I has not had any extended outages since issuance of IEB 79-02 was issued on March 8. 1979.
Unit 2 had refueling outage March 22, 1979, to April 12, 1979.
No testing was performed on Unit 2 during that time. The licensee indicated time was too short to develop a program and recover original drawings and design basis, c.
The auxiliary building common to Units 1 and 2 will be tested during plant operation.
d.
Two types of anchors were utilized:
Wedge type (Weg-iT) and shell type (Phillips " Red Head").
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e.
Each system identified as seismic Class I is planned to be 100%
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tested in order to assure system by system operability. This 100% inspection was considered necessary after an initial sample inspection indicated more than 5% of the anchors were defective. The initial sample consisted of inspecting a total of 12 wedge type bolts of which 5 were acceptable, I sheared off due to corrosion, and 6 failed due to bolt slip at working load under direct tension test.
In addition, 9 shell type anchors were inspected of which 6 were in contact with the plate and 3 were acceptable.
2.
Review of Procedure for Expansion Anchor Bolt Test Programs The inspector reviewed specifications for the anchor bolt test program. The specifications encompassed the requirements for inspection of expansion anchor bolts as stated in the IE Bulletin.
QAP-PB-4, Phillips, Getchow procedure for Identification and a.
Initial Inspection of Seismic Category I Pipe Supports.
b.
Procedure for Verification and Inspection of Concrete Fasteners in Response to NRC IE Bulletin 79-0?
c.
Procedure for Verification and Inspection of Concrete Expansion Anchors in Response to NRC IE Bulletin 79-02 (Ultrasonic Testing Procedure, Rev. 1, dated March 7, 1979).
The licensee had developed torque values for verifying installations for wedge type and shell type anchors.
The following are the established values which are to develop 1.5 times working load in lieu of one-fourth ultimate loads.
Torque Values (PT-LBs)
Anchor Wedge Shell Size (in)
Type Type 1/2
20 5/8
31 3/4
58 7/8
73
105 1 1/4 182 The inspector indicated to the licensee that the above torque values would need to be substantiated in order to be acceptable.
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3.
Observation of Testing Concrete Expansion Anchors (Unit 1)
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The inspector observed selected work activities including ultrasonic testing for determining bolt embeded length, repair of deficient anchor bolts and in process inspection activities.
The following specific items were observed:
S-584 - observed st ructural modification being performed af ter a.
bolts failed inspection.
b.
(Unidentified support) Location next to S-626 - observed where grout had been chipped away.
Threaded stub was observed to be welded to embeded bolt.
c.
S-899 - observed ultrasonic inspection for bolt embedment length. UT was being performed properly used calibration bolts of various lengths prior to each test.
d.
S-551 - observed ultrasonic inspection for bolt embedment lengths.
e.
S-880 - observed structural modification due to identified bolt deficiency.
f.
The inspector observed torque / tension qualification tests being performed on-site by Hilti Fasteners, Incorporated, for Wisconsin Electric Power Company. Torque values that were being developed are pla:.ned to be used at installations where repairs are necassary after identifying deficiencies in present installations.
These torque values are to be incorporated in the repair procedure.
4.
Review of Quality Records for Testing Anchor Bolts A review was made of base plate support inspection data sheets.
The sheets included all necessary information to document inspection findings.
Where deficiencies were identified, an engineering review was being performed on-site to determine if a structural modification was required or to substantiate acceptability by engineering analysis.
From the records reviewed, typical deficiencies identified to date are as follows:
a.
Hanger does not conform to original design sketch, b.
Shell type anchors in contact with base plate.
c.
Nut on wedge type bolt turned under torque value that correlates to working load thereby indicating bolt had not been properly set or preloaded.
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d.
Bolts loose in hole (support S-880).
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Incorrect thickness of plate; 1/2 inch plate installed should e.
be 1 inch thick plate according to drawing (support S-869).
f.
Six 3/4" bolts used while detail shows eight 7/8" diameter bolts (support S-869).
g.
Support was floor mounted while detail shows wall mounted (support S-901).
The above indicates that a 100% reinspection program is required to verify as installed condition and initiate corrective action as required to assure system operability for seismic Category I pipe supports.
5.
Other Items in IE Bulletin 79-02 a.
The bulletin requires verification that pipe support base plate flexibility was accounted for in the calculation of anchor bolt load. The licensee indicated that Bechtel is performing a review of base plate flexibility. To date, an analysis of approximately 300 plates have been completed with 10 plates requiring structural modification in the form of stiffeners or enlarged plates. A total of approximately 800 to 1000 plates are planned to be reviewed for flexibility.
b.
The bulletin requires a description of the design requirements for anchor bolts to withstand cyclic loads. The licensee indicated that Bechtel was developing a response for this item.
Exit Interview The inspector met with site staff representatives (denoted in the Persons Contacted section) at the conclusion of the inspection on June 14, 1979.
The inspector summarized the scope and findings of the inspection. The licensee acknowledged the findings.
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