ML20040H492

Final Deficiency Rept Re Improper Matl Traceability for Concrete & Grouting,Initially Reported 801215.Recommends Sand Cement Grout Be Replaced

ML20040H492
Person / Time
Site:	Columbia
Issue date:	02/05/1982
From:	Matlock R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, GO2-82-143, NUDOCS 8202180309
Download: ML20040H492 (4)

Text

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Washington Public Power Supply System C P.O. Box 968 3000 GeorgeWashingtonWay Richland, Washington 99352 (509)),p p Docket No. 50-397 ~ '6 pjf j ,

February 5, 1982 UCICIJ y,,:, .

G02-82-143 x e $w s

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Mr. R. H. Engelken C -O , ..

Nuclear Regulatory Commission E' gg 7 7 7gg 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 f "NSEM7 m j

Subject:

NUCLEAR PROJECT 2

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sf 10CFR50.55(e) POTENTIALLY REPORTABLE CONDITION #73 CONCRETE AND GROUTING WORK - CONTRACT 215

Reference:

a) Letter G02-80-302, dated December 15, 1980, Supply System to NRC, Potentially Reportable Deficiency b) Letter G02-81-244, dated August 17, 1981, Supply System to NRC, Potentially Reportable Condition on Concrete and Grouting Work, Contract 215 c) Letter G02-81-402, dated October 23, 1981, Supply System to NRC, Request for Extension of 10CFR50.55(e) for Reportable Condition #73, Concrete and Grouting Work d) Letter G02-81-491, dated November 15, 1981, Supply System to NRC, Request for Extension of 10CFR50.55(e) for Reportable Condition #73, Concrete and Grouting Work Your office was informed of a potentially reportable condition concerning concrete and grouting in November of 1980. Reference a) provided disposition on a portion of the conditions cited. Reference b) provided an interim report on grouting describing the suspected deficiency, approach to resolution, and status. Reference c) and d) were updates to the interim report which detailed the delays involved in arriving at a process upon which to base a final report. A final report is attached for your records.

A material test program was developed to assess the condition of the grout installed by Contract 215 for which material records could not

. be provided. The test program utilized micro-coring to obtain samples of materials from the installation which could then be tested in the laboratory to verify essential properties, i.e., compressive strength.

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t Mr. R. H. Engelken Page Two February 5, 1982 G02-82-143 The engineer evaluated the results'of'the program and concluded the grout material was unacceptable. Further discontinuities in the installation, observed during the, implementation of.the Micro-Core- m Program indicated that the placement ofe thejgrouth'ad,beenperformed?

without' adequate qualiti contro.1 measures. The engineer has, therefore, concluded that the condition'is reportable and has recom -

mended the sand cement grout installed.under Contract 215 be replaced.

Thematerialtestprogramhasdemonstriatedwe.haveaprocessbywhich .

we.can validate the property of grout materials in our existing installation. We intend to~ utilize the process, as necessary, to confirm the quality of other contract' ors' grouting.' .These findings will be a matter of record with any. deficiencies dispositioned and reported in accordance with the existing project procedures.

If you have any questions, please contact Mr. R. T. Johnson at (509) 377-2501, extension 2712.

,, r f.,G.MatlockA f ?Ns%4C5b Program Director, WNP-2 RLH/kd-

Attachment:

Final Report cc: Mr. W.S. Chin, BPA - Site' Mr. R.A. Feil NRC Resident Inspector - WNP-2 Mr. J.A. Forrest, Burns,and Roe - HAP 0 Mr. N.D. Lewis, NRC Mr. J. Plunkett, NUS Corp.

Mr. R.E. Snaith, Burns and Roe - NY Mr. V. Stello, NRC EDC WNP-2 Files

February 5,1982 -

G02-82-143 FINAL REPORT SUPPLY SYSTEM NUCLEAR PROJECT NO. 2 DOCKET NO. 50-397 LICENSE NO. CPPR-93 10CFR50.55(e) REPORTABLE CONDITION NO. 73 CONCRETE AND GROUT WORK - CONTRACT 215 DESCRIPTION OF DEFECT OR NON-COMPLIANCE It has been determined that the Contract 215 contractor performed-Quality Class I grouting, on safety related hanger baseplates, using sand cement grout without proper. material traceability and. quality control measures, including material testing and documentation.

These deficiencies are deemed to be reportable under.10CFR50.55(e) on the basis that en element of the, hanger installation which does not comply with specification requirements could have caused failure, jeopardizing the function of safety related equipment.

APPROACH TO RESOLUTION OF THE PROBLEM The Supply System reported to the Commission (G02-81-402) that delays in obtaining' documentation on grout had initiated Burns and-Roe to issue technical direction to Pacific Testing Laboratory to develop a Micro-Coring program. Micro-Coring is a process of extracting small diameter cylinders.as samples of the material in place. The sample material can then be tested by methods which have been demonstrated to provide results which will correlate with the test.results on similar material. performed by standard methods.

The grout. record search was concluded when it became apparent it would not .I produce any usable.information.concerning.the installation of sand cement grout. The Micro-Core approved program was thereupon implemented following demonstrations that cores could be satisfactorily obtained from the existing installation and acceptance _by Burns and Roe of the correlation test results.;

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. t The program results were predominately negative. The sand: cement grout samples obtained indicated unacceptable low strength. The grout, in a majority of the sample locations, was of-such poor quality that no usable core samples could be extracted.' These conditions instigated further inspections which revealed 1 inconsistencies in the grout installation under hanger baseplates, in addition to the material concerns. Based on these results, it has'been concluded that the sand-cement grout installation

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performed under Contract-215 is1 unacceptable and a reportable condition exists.

The conditions identified relative to Contract 215 warrant our review of

-grout work performed under'other contracts. Installations which are found to be unacceptable will be documented and corrected by replacement or as directed by the engineer.

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Final. Report February 5, 1982

~Page Two,

. G02-82-143.

STATUS'0F RESOLUTION i

' The Supply System-will direct the Construction Hanager to proceed.with removal .

of sand cement grout placed under: Contract 215 as an. element in establishing proper. hanger installation. Exception.to this direction will'be on a case

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i by-case b~ asis subject to Burns and Roe's, approval. The' work will be scheduled in accordance with the overall project requirements' predominately on a system - '

by-system basis. ~

j' ACTION-TO PREVENT RE0CCURRENCE The; Supply System has removed future installation'of components.and grout a froni Contract 215.

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