ML19256G232
| ML19256G232 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 12/14/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Strand N WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| References | |
| NUDOCS 7912280511 | |
| Download: ML19256G232 (1) | |
Text
US N:!CLEA; I;EGULAIONY COMM!SSIGil 4
p.Ec!0.'4 V, OfflCL OF INSPECTION & EliFORCEMENT.
I tyB N. CAUT0ahiA BLVD. SulTE 202 V!RNUT CREEK, CAUFORNIA 94596 i
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DecerNr 14, 1979 Dccket I;o. 50-508 Fashington Public Power Supply Systen P. O. Box 958 sq Richland, Washington 99352 Attention: Mr. N. O. Strand Managing Director Centicnen:
Subject:
Report on Deficiency Involving Omission of Vertical Reinforcirq Steel in Walls, Wr;P No. 3 (Your Ictter of recauber 3,1979)and letter, R.H. Engelken to N. Strand dated toverir_r 7,1979) i i
Thank you for your letter, referenced above, which fon'arded an interim repcrt pursuant to 10 GR 50.55(e) regarding the subject rrntter.
Your report will be reviewed and evaluated, and we are looking forward to receipt of your final report on this riatter. At that tirm we will advise you of our ccncurrence recarding the resumption of wrk on the walls in question, in accordence with our Iratediate Action Letter issued NovccNr 7,1979.
Your cooperation with us in appreciatal.
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Sincerely, (Mgied 5%*'l> S E& W R. H. Engelken Director
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U.S. Nuclear Regulatory Commission
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1990 North California Boulevard
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Suite 202, Walnut Creek Plaza G.
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Walnut Creek, California 94596
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Attention:
Mr. R. H. Engelken Director of Regulatory Operations
Subject:
WPPSS NUCLEAR PROJECT NO. 3 DOCKET NUMBER 50-508 REPORTABLE DEFICIENCY, 10CFR50.55(e)
Reference:
Telecon, J.C. Lockhart to D. Kirsch, dated November 2, 1979
Dear Mr. Engelken:
In accordance with the provisions of 10CFR50.55(e), your staff was informed by telephone on November 2,1979 of a reportable condition involving the omission of vertical reinforcing steel in the shear wall separating the WNP-3 Fuel Handling Building and the Reactor Auxiliary Building.
Attached is our report concerning this deficiency.
It is our intention to begin drilling holes to implement this solution and to issue a second report to you following the pull test on the dowels.
Please contact us if you require additional information.
Very truly yours, dh N. O. Strand Managing Director Attachments cc:
D. Smithpeter - BPA WNP-3/5 Files - Richland Director of Inspection and Enforcement 3g'i7d t
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J Omission of Vertical Reinforcing Steel in Fuel Handling Building Wall 3FHWOO6362.5 10CFR50.55(e) Defect / Noncompliance Report Report Number 008 WPPSS Unit 3 Summary On October 24, 1979 concrete placement number FHWOO6362.5 was completed by Morrison-Knudsen.
This placement is an interior shear wall in the Fuel Handling Building of Unit #3. As the vertical reinforcing steel for the next subsequent concrete placement was being set in place it was found that 194 vertical dowels had been left out of the previous placement. The respon-sibile concrete placement contractor's Quality Control program who has the first line inspection responsibility, overlooked the 194 #11 vertical dowels which were omitted.
Description Morrison-Knudsen, the placing contractor, has an approved concrete placing and inspection procedure #CP-ll which has a concrete place-ment checklist that includes verifying that all rebar is installed properly. This preplacement checklist was signed for final release but not for Reinforcing Steel-QC Inspection at the time of concrete placement.
However, the WPPSS/Ebasco's Concrete Tracking Record, which must be signed prior to release of concrete for placement, was signed by the contractors foreman and QC Inspector indicating all rebar was placed correctly. The contractor could not give any definite reasons for the omission of the subject dowels, except for an error in interpretation of the drawings.
The wall in which the noncompliance occurred is a 7' 6" to 9' thick shear wall that separates the Fuel Handling Building from the Reactor Auxiliary Building. The subject dowels are 11' 0" long straight #11 bars which were to be installed with a 5' 0" embedment length below elevation 362.5 and a 6' 0" projection above elevation 362.5. This wall serves as a main load bearing shear wall. The design loads exerted on the wall are a combina-tion of earthquake, temperature, slab, and equipment loads. The third row of reinforcing in each face from El. 357.7 to El. 425 is due to temperature loads exerted by the Fuel Pool starting at elevation 383. The structural integrity of the wall would have been adversely impacted had the subject dowels been omitted.
The contractor initiated a Nonconformance Report (NCR 42510) on 10/30/79 and it was transmitted to the Owner / Engineer on 10/31/79.
The NCR identified the dowels which had been omitted. The appli-cable Engineering drawing is 3240-G-2456 R2.
Corrective All of thg omitted dowels shall be installed by drilling a three Action inch (3" - 1/2") diameter hole 4' 6" deep at a location as close to the original design location as possible for each dowel. The omitted dowels shall be installed in the drilled holes and grouted in place using an approved non-shrink grout.
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Three additional dowels will ba drilled and grouted in a method identical to that stated above for the purpose of performing a tensile pull test en the test dowels. This will verify that the required design tensile strength is being developed and will meet the original wall design criteria.
The following action to prevent recurrence will be taken:
1.
Morrison-Knudsen shall be required to change their procedures to require that all drawings applicable to concrete placements surrounding the one being checked out will be reviewed and checked for reinforcing bars and interferences which may impact the placement in question.
2.
The contractor shall be required to complete his concrete placement checklist and attach a copy to the Concrete Tracking Record prior to signing the latter.
3.
The contractor shall be required to provide a procedural mechanism to verify that all the required bars are installed in the correct location and manner, such as marking up a current set of rebar placing drawings by the QC Inspector.
4.
Upon completion of the above three items a training session shall be conducted with the applicable personnel to assure that the action as stated will be correctly implemented.
These items shall be complete within thirty (30) days of receipt of the NCR with an approved recommended disposition.
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