IR 05000482/1979015
| ML19249E664 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 08/13/1979 |
| From: | Crossman W, Randy Hall, Oberg C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML19249E661 | List: |
| References | |
| 50-482-79-15, NUDOCS 7910020126 | |
| Download: ML19249E664 (4) | |
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U. S. NUCLEAR REGUL\\ TORY C0t!}tISSION OFFICE OF INSPECTION AND ENFORCEllENT
REGION IV
Report No.
STN 50-482/79-15 Docket No.
STN 50-482 Category A2 Licensee:
Kansas Gas and Electric Company Post Office Box 208 Wichita, Kansas 67201 Facility Name:
Wolf Creek, Unit No. 1 Inspection at:
Wolf Creek Site, Coffey County, Burlington, Kansas Inspection Conducted:
August 6-7, 1979
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o Inspector: p ! Hall, Chief, Engineering Support
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R. E LYate Section h//8/7k Reviewed by:
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R. Oberg, Project inspector, Projects Date Section O[d/7f Approved by:
e" W. A. Crossman, Chief, Projects Section Date Inspyction Summary Inspectic,n on August 6-7, 1979 (Report No. STN 50 ~. / 79-15 )
Arra Inonect<7:_ Specia:, un a.n n o u n ce.! i nnp.'e t ' < " of cirenn:tanc"
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in a void in the Secondary Shield wall concrot" Tl. i s oid ' r reimrt d to the.NRC on Aug,ust 2, 1979.
The inspection involved eight inapector-hours by one NRC inspector.
Results:
No items of noncompliance or deviations were identified.
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DETAILS 1.
Persons Contacted Principal Licensee Personnel
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- J. O. Arterburn, Director Nuclear Development D. W. Prigel, Assistant Quality Assurance Manager
- G. W. Reeves, Quality Assurance Engineer Daniel International (DI)
- W. E. Hitt, Project Manager S. E. Jinks, Assistant Area Superintendent-Reactor Building
- J. D. Baker, Technical Superintendent-Concrete C. L. Phillips, Project Civil Engineer
- V. J. Turven, Quality Assurance Manager 21. Hussain, Assistant to Project Manager Other construction and quality control persoanel were also interviewed as necessary during the inspection by the IE inspector.
- Denotes those personnel present at the exit interview.
2.
Secondary Shield Wall On August 2, 1979, KG&E notified the NRC of the existence of a void in the exterior surface of the northwest portion of the Secondary Shield wall.
This void was reported to be in the exterior wall surface adjacent to the anchor embedment for the Loop 1 Reactor Coolant pump lateral restraint.
This void was discovered follouing form removal and was documented on NCR ISN 1137C, dated August 3, 1979.
The NCR, including the recommendation for repair using non-shrink grout in accordance with the concrete specification 10',66-C103, had been forwarded to Bechtel for approval at the time of the inspection.
During this inspection, the reported void was exmrinel.
The initial void had been chipped out to sound concrete and, ther-by, enlarged to an irreg-ular area approximately 3' x 4', exposing an exterior layer of #18 reinforcing stul, m ad h. 'r t Irjer of :11 re m urcing ;teri, and the steel plates of the cabedment.
Photographs of t he res;mn of the embedment prior to concrete placement were also examined.
These photographs and the exposed void configuration showed the congestion in the area of the void.
This placement had been considered a dif ficult placement by the DI Technical Superintendent-Concrete, and special instructions had been developed to apply extra attention to flowing concrete into the congested areas; however, no specifics as to necessary techniques or equipment were defined.
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Three other Secondary and four Primary Shield wall placements housing similar anchor embedments were also examined.
nune included a void of the type noted above.
One small void on the interior surface of the Loop 2 Reactor Coolant pump lateral restraint auj several inadequately consolidated " rock pockecs" viere apparent; however, all were repairable using procedures defined in specification 1046f-C103Q, without specific engineering review and approval. Repair *of these areas was observed to be in progress.
The following documentation was examined during, this inspection:
Contract Specification 10466-C103(Q), Revision 16, dated February 10, 1979, " Technical Specification for Contract for Forming, Placing, Finishing and Curing of Concrete for the Standarized Nuclear Unit Power Plant System (SNUPPS)"
Daniel Work Procedure WP-IV-106, Revision 6, de ad July 10, 1979,
" Concrete Pre-Placement, Placement, and Post-E icem'.nt" Daniel QC Procedure QCP-IV-106, Revision 7, dated July 12, 1979, " Concrete Pre-Placement, Placement, and Post-Placement" Non-Conformance Report ISN 1137C, dated August 3,1979 Special Instructions for Placement and Consolid uion of Concrete Placements 0C231W32 and OC231W33, undated Bechtel Drawing C-OS2946 (Q), Revisien 5 Pour Cards for Placements 0C231W32 and OC231W33 Concrete Test and Delivery Records for Placements 0C231W32 and OC231W33 No definitive cause for the existence of the void in the exterior surface of the northwest corner of the Secondary Shiels call was identified during this inspection.
Several factors apparently ct :tributed:
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Extremely congested areas existed between se embedment and the forms, making concrete flow and consolidal an difficult.
Similar placements in other areas of the Secondary Shield wall did not result in voids.
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Preplanning had recog.iized the potential p oblems, but had not provided specific guidance to aid in avoid:ng placement problems.
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Concrete delivered for the placement met spatification requirements; c.
however, several loads were rejected by construction because slump was below the target slump and it was difficult to place in the congested placer..ent.
The potential for improved preplanning of. difficult placements had been previously documented in a July 1979, KG&E Audit Report for the Secondary Shield wall placements and several others.
Review of a sample of subsequently prepared special instructions for difficult placeme.its has revealed greater specificity in techniques and guidance.
No items of noncompliantes or deviations were noted.
3.
Exit Interview The IE inspector met with licensee representatives (denoted in paragraph 1) at the conclusion of the inspection on August 7, 1979.
The IE inspector summarized the scope and findings of the inspection.
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