ML19262A458
| ML19262A458 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/06/1971 |
| From: | Folsom S US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19262A457 | List: |
| References | |
| 50-289-71-06, 50-289-71-6, NUDOCS 7910290802 | |
| Download: ML19262A458 (5) | |
Text
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U. S. ATOMIC ENERGY COMMISSION i
DIVISION OF COMYLIANCE REGION 1 i
r.
CO Inspection Report No. 50-289/71-06
Subject:
Metropolitan Edison Company Three Mile Island 1 License No. CPPR-40 Location: Three ' Mile Island (near Middletown)
Priority Pennsylvania Category A
Type of Licensee: PWR, 2535 (B&W)
Type of Inspection:
Special, Announced.
Dates of Inspection:
November 16, 1971 Dates of Previous Inspection:
October 13-15, 1971 Principal Inspector:
. ddW424_ h A
/2-8-7/
ti./ A. Folsom, Reactor Inspep or~
Date Accompanying Inspectors: L. L. Beratan Sr. Structural Engineer Date Date NONE Other Accompanying Personnel:
Date Reviewed By:
b7. O-MYdA d /
/2'b'7f s
- c.. n. nowara, sento Reactor Inspector Date NONE Proprietary Information:
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7910290 802 1480 557
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N 5-l 2-b gCTION I Enforcement Action None 1
Licensee's Action on Previously Identified Enforcement Matters Not applicable.
Unresolved Items Not applicable.
Status of Previously Reported Unresolved Items 2
Not applicable.
Design Changes g
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Not applicable Unusual Occurrences None a
Persons Contacted
- Metropolitan Edison Company J. H. Wright, QC Engineer (Civil)
M. J. Stromberg, Site QA Supervisor (GPU)
. 7, UE6C I
R. J. Vurpillat, Assistant Manager, QC J. C. McKee, Assistant Project Manager F. L. Reed, Senior Site QA/QC Supervisor Gilbert Associates K. E. Nodland, Civil Engineer 1480 (58
- Attended the exit interview.
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Exit Interview j
The following subjects were discussed.
o A.
The inspector asked if coring was planned on the 180 sector of the
.j ring girder which the constructor assumes to be void-free.
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Mr. McKee said that he vss confident that voiding had occurred only in the 180 sector currently being investigated, and that 0
j;i coring would be confined to that portion of the ring girder.
.. M B.
The inspector asked what fire protection would be provided in the s
ring girder area during the remainder of the investigation / repair j
work in view of the large quantity of wooden scaffolding and ply-wood sheeting, the gas-burning heaters, the plastic enclosure, and the restricted (wooden ladder) access to the work area.
,-q Mr. McKee stated that fire protection in this area was being studied.
C.
The inspector questioned the effect on structural strength resulting from the extensive use of vertical sections of expanded metal for dividing the dome concrete placements in view of the suspected contribution of this type of divider of dome ccicrete failure at another facility.
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Mr. McKee acknowledged the inspector's comment.
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e 1480 359
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-1 SECTION II
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Additional Subjects Inspected, Not Identified in Section I, Where No Deficiencies or Unresolved Items Were Found See attached Section II, prepared by L.
L'.
Beratan.
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1480 360
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Feeder Reoort Section II ADDITIONAL SUBJECTS INSPECTED, NOT IDENTIFIED IN SECTION I, WHERE NO DEFICIENCIES OR UNRESOLVED ITEMS WERE FOUND 1.
An examination was made of the 5 cores rencved from the ring girder One of the cores showed a zone of poor concrete about 4 inches from the top of the core. This area of poor concrete was confirmed by
-the constructor when a borescope examination w.s conducted.
The
' concrete will b'e removed beyond this zone into sound concrete in this area of the ring gird:r.
2.
A large amount of the reinforcing steel not yet removed is ba'dly gouged and deformed. The Architect-Engineer (A&E) and the Constructor (UE&C) are evaluating dhat damaged steel must be replaced and what
-i can be ~ reused. Criteria will be developed and written into the repair procedure which will be submitted to DRL fo: evaluation.
3.
A physical examination was made of the sector of the ring girder in l
. which voids were detected. Those portions which contained single rows of bearing plates are the areas in which concrete was being removed with chipping hammers.
The concrete was being removed to a
. depth of 18 to 24 inches. The areas with double rows of bearing
__. _ __ ____. plates.wil.1 be vothed on.later.
4.
Additional coring and drilling will be performed on a continuing
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basis. The drilling is now being done with a rotating bit rather than with a prismatic pointed tool in an air gun.
These holes are
.___.... _ _ b.cing..used.to, check the. con. crete for,a depth o L4_ inches, beyond that which, concrete removal had stopped.
5.
It was observed that on' the done expanded metal was being used in the
- - concrete construction joints of the ring pours.
It was discussed at the meeting that this type of joint was suspected as the cause of a failure in the dome concrete at another facility and that a great
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deal of care should be taken to see that the concrete is properly consolidated.
- 6.
A " mock up" of the concrete repair was examined. -The block of concrete was cut into slices about 6 inches thick. The purpose of this test block was to check on the effectiveness of the cpoxy bounding com-pound used between pours. The sample joint looked good but no testing of the strength of t'..a joint had been conducted.
1480 5bi
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