ML19260A146
| ML19260A146 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/25/1972 |
| From: | Howard E, Varela A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19260A141 | List: |
| References | |
| 50-289-72-02, 50-289-72-2, NUDOCS 7910290760 | |
| Download: ML19260A146 (5) | |
See also: IR 05000289/1972002
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U. S. ATOMIC ENERGY C0m1ISSION
DTVISION OF COMPLIANCE
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REGION I
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CO Inspection Repcrt No.
50-209/72-02
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Subject:
Metropolitan Edison Company
Three Mile Island linit No. 1
License No.
CPPR-40
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Location:
Three Mile Island (near Middletown)
Priority
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B
Category
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Iype of Licensee:
PWR, 2535 (B & W)
Type of Inspection:
Special (Unannounced)
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January 27, 1972
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Dates of Inspection:
Dates of Previous Inspection: December 16-17, 1971
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Principal Inspector:
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A. A. Warela, Reactor Inspector
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Accompanying Inspectsrs:
None
Dtte
Dste
Other Accompanying Personnel:
None
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Reviewed By:..s
,';"/r# ofD
2-20*h
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E. M.'Howard, Senior Reactor Inspector
Date
Proprie tary Information:
None
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SECTION I
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Enforcement Action
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None
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Licensee Action on Previously Identified Enforcement Matters
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A.
Nonconformance in moist cure of freshly placed concrete on con-
tainment building dome.
Compcrative strength tests by Swiss
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Hae=er indicate no loss in strength resulted in the area where
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concrete curing was in nonconformance with the specifications.
Proced r1 changes necessary to assure that this deficiency
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would not recur were reviewed'. This item will be reinspected
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at our next inspection.
(Paragraph 4,Section II)
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B.
Repair is continuing on the ring girder concrete voids in
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accordance with proposal submitted to DRL.
This item is not
considered resolved.
(Paragraph 3,Section II)
Unresolved Items
None
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Design Changes
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Not applicable.
Unusual Occurrences
Not applicable.
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Persons Contacted
Metropolitan Edison Company /GPU
Mr. B. / vers, QA Manager
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Mr. M. Stromberg, Site QA Supervisor *
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Mr. J. Wright, Resident Civil Engineer *
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Mr. R. Neidig, Assistant Resident Civil Engineer <
United Encineers and Constructors
Mr. B. Moyer, QC Supervisor *
Mr. B. Haugen, Ring Cirder Repair Supervisor
Mr. D. I.ambert, QC Engineer
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- Attended Exit Meeting.
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Management Interview
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The licensee stated that the earliest date for first concrete was ex-
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pected in mid February and, CO would be notified three days in advance.
The location of the first concrete replacement was identified as Segment
II, azimuth 330 to 630, lower part only, where minor damage resulted
from concrete excavation.
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SECTION II
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Additional Subjects Inspected, Not Identified fc Section I, Where No
Deficiencies or Unresolved Items Were Found
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1.
Butt Welding Procedure and Welder Qualificatien
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United Engineers & Constructors (UE&C) Procedure No. 25 revised
January 13, 1972, for Field Uciding of Reinforcing Eara was audited,
it was qualified in accordance to requirements specified in AWS-
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D12.1 ead found without deficiency.
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UE&C records were audited and eight welders were noted to have
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qualified to the parameters of the procedure.
2.
Defects in Rein _"orcing Steel - Study of Repair by Filler Metal Weld
The inspector reviewed in detail a report of tests conducted in the
PTL laboratory on reinforcing steel, bar sizes 6, 8, 9, and 11, which
were notched to a depth of up to 3/16", ground out to 7/32" and then
repaired by welding.
Strength tests on these bars which were repaired
in accordance with UE&C Weld Procedure No. 25 met the ASTM A-615,
Grade 40 requirements for yield, ultimate and elongation.
Details of Subjects Discussed in Section I
3.
Repair of Ring Girder Concrete Voids
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a.
Status of Concrete Excavation
All of Segments I and II of the Ring Girder appocred to have
been excavatet to sound concrete. The inspector was informed
that the requi:ed depth of the excavation was determined by
core boring and borescope survey. Verification cores are being
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taken, and probes are being made to assure that the remaining
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concrete is sound. Additional concrete is being removed where
required with small pneumatically actuated wedge point tool
to a sound face.
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No Segment III concrete, beyond that removed during the initial
investigation, has been excavated.
The inspector was informed b-j the licensee that QC approval and
Engineering approval of the excavation of Segments I and II
has not been obtained.
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b.
Cora nrilline and Borescope Suryey
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The inspector was informed that about twenty-five (25) 1" diameter
cores and bere surveys have been completed of the thirty-six (36)
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initially planned for verification of sound concrete in Segment
I and II.
c.
Rebar Replacement
Rebar replacement by Cadweld splicing stated in Segment I
between azimuth 3330 and 03 . The inspector observed
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about twenty-five completed Cadweld splices of No. 8 and No. 9
rebar.
Some lap splicing, but only of dome tendon spirals,
were observed in this segment only. The inspector was
informed that other rebar replacements h.'ve been prepared,
fitted into position, and matchmarked, then removed pend-
ing completion of other work. Preparation of rebar re-
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placement follows QC mapping of each location and photo-
graphing of some locations, the inspector was informed.
Records were not audited at this inspection by the inrpec-
tor on Cadwelds or rebar.
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d.
Tendon Conduit Repair
Tendon Conduits were observed to be repaired only in Segment I,
azimuth 3330 to 030
Six vertical and two roof ducts, epoxy
patched with a curved section of conduit were observed to be
completed at the time of this inspection.
4.
Containment Dome Concrete
The licensee states that comparative strength tests =ade with the
Swiss Hammer indicated no loss in strength resulted in the area where
concrete was in nonconformance when compared with that in adjacent
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area cured in conformance to specifications.
The licensee additionally
states that clarification of specifications were implemented December
17, 1971 to assure that activities fully comply with specification
requirements.
Quality Control procedures in concrete cure will be
audited at the next C0 inspection to verify that apparent loop
holes have been closed.
Therefore, this item remains unresolved.
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