ML20041C520
| ML20041C520 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 02/16/1982 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ANPP-20164-GHD, DER-81-47, NUDOCS 8203020159 | |
| Download: ML20041C520 (3) | |
Text
Docket Nos. 50-528/529/530 J
Tl 50.55(e) Report
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U. S. Nuclear Regulatory Commission SD ~
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1450 Maria Lane - Suite 210 RECGWgo Walnut Creek, California 94596-5368 2
Attention:
Mr. B. H. Faulkenberry, Chief 01 igm 3 Reactor Construction and r
Engineering Support Branch
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3 Subj ect.:
Final Report - DER 81-47 A 50.55(e) Report Relating to Grout Patch Unit 1 Main Steam Support Structure Floor Slab File: 82-019-026 D.4.33.2
Reference:
(A) Telephone Conversation between J. Eckhardt and J. Cook on December 17, 1981 (B) ANPP-19933, dated January 18, 1982, Interim Report
Dear Sir:
Attached, is our final written report of the deficiency referenced above, which has been determined to be Not Reportable under the requirements of 10CFR50.55(e).
Very trul youg,
CQL d LLk E. E. Van Brunt, Jr.
APS Vice President Nuclear Projects ANPP Project Director EEVBJr/GHD:ske Attachment cc:
See Attached Page 2 r'203o2oi59 sac 216 6l '!
PDR ADOCK 05000528 S
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U. S. Nuclear Regulatory Commission Attention:
Mr. B. H. Faulkenberry, Chief February 16,.1982 ANPP-20164-GHD/BSK' Page 2 cc:
Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 J. A. Roedel D. B. Fasnacht G. C. Andognini F. W. Hartley J. M. Allen A. C. Rogers B. S. Kaplan W. E. Ide J. Vorces J. A. Brand A. C. Gehr W. J..Stubblefield W. G. Bingham R. L. Patterson R. W. W'elcher R. M. Grant D. R. Hawkinson L. E. Vorderbrueggen R. L. Greenfield Assistant Attorney General Bataan Memorial Building Santa Fe, New Mexico 87503 Ms. Patricia Lee Hourihan 6413 South 26th Street Phoenix, Arizona 85040 l
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FINAL REPORT - DER 81-47 DEFICIENCY EVALUATION 50.55(e)
ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNCS UNIT 1 I.
Description of Deficiency An existing grout patch in the bottom of the Elevation 100'-0" floor slab of the Main Steam Support Structure was found to be hollow and cracked.
Four (4) exploratory holes were drilled and the patch material was found to be soft and not bonded.
The grout patch was found to extend under an embed ~ plate and under approximately one-half of an embedded unistrut. The 3'-6" concrete slab was placed on April 20, 1979 (Placement
- 1M003-U1). This area was apparently repaired with pneumatically placed grout soon after the forms were stripped on April 21, 1979.
PVNGS DER 79-12 covers the past problems associated with pneu-matically placed grout.
Procedures in effect at that time identified and repaired surface voids by use of Rework Tag's, not'NCR's which were required only if a void extended completely through a wall. At a later date, the procedures were changed to require NCR's on voids extending past the first layer of reinforcing bar.
On April 29,1980, NCR C-X-1897 was written to inspect all previously grouted or repaired voids. The above void was missed during that inspection; this oversight occurred because the Rework Tag for the original defect had apparently been lost.
Discovery of this particular defective grout patch is considered an isolated case since the corrective action taken in regard to DER 79-12 is considered effective.
II.
Analysis of Safety Implications It is determined by an analysis of the existing condition (assuming the grout patch area is a void) that there is enough embedment in the sound concrete to develop the anchor bolts pn the embed plate for the required load, and the surrounding concrete is sufficient to develop the reinforcing steel to resist the forces in the slab under all postulated loading. There is a single conduit attached to the embedded unistrut. The attachment is within the area of the grout patch.
It is also determined by analysis that the partial absence of sound concrete under the unistrut will not affect the integrity of this support for this particular load.
III.
Corrective Action Nonconformance Report CC-3089 will be dispositioned to have the grout patch repaired.
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