ML20102B953

Supplemental Final Deficiency Rept (53564-K159) Re Concrete Coatings Inside Containment.Initially Reported on 841213. Coated Concrete Surfaces Inside Containment Will Perform Satisfactorily Under DBA Conditions

ML20102B953
Person / Time
Site:	Wolf Creek
Issue date:	02/13/1985
From:	Koester G KANSAS GAS & ELECTRIC CO.
To:	Denise R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
(53564-K159), KMLNRC-85-045, NUDOCS 8503050017
Download: ML20102B953 (2)

Text

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KANSAS GAS AND ELECTRIC COMPANY THE ELECTAC COMPANY I

February 13, 1985 GLENN L KOESTER vect Passiosmo muctaan Mr. R.P. Denise, Director F Wolf Creek Task Force U.S. Nuclear Regulatory Comission ,

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Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011

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KMLNRC 85-045 -

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Re: Docket No. SfN 50-482 Ref: Final Report KMLNRC 85-027, dated 1/13/85 from GIEoester, KG&E, to RPDenise, NRC Subj: Supplemental Final 10CFR50.55(e) Report - Concrete Coatings Inside Containment (53564-K159)

Dear Mr. Denise:

This letter provides additional information, submitted pirsuant to 10CFR50.55(e), concerning concrete coatings inside Containment at Wolf Creek Generating . Station (NCGS). This matter was originally reported on DeceLber 13, 1984, and a final report was provided in the Reference.

As stated in the Reference, Kansas Gas and Electric's (KG&E) investigation into the adequacy of Containment concrete coatings was initiated as a result of an allegation made by an exiting Quality Control Coatings Inspector. Upon exiting he stated that he had inspected coatings work recently performed inside Containment but had not completed some of the corresponding l inspection reports. His allegation was that, since he was leaving, the inspection reports may be, or may have been prepared by someone other than himself. This allegation was investigated and proved to be unfounded. However, since the inspector had not documented his inspections, Nonconformance Report (NCR) ISN 21203C was initiated to document this condition and assure appropriate resolution. In addition, as part of the overall

, investigation into this matter, a review of concrete coating gg

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inspection records was conducted to identify any other areas for which documentation was not available. The areas with

@@ unretrievable documentation have been documented on NCR's and on included in the overall evaluation to determine "wrst case" coatings locations as described in the Reference.

DN 00 The Reference also stated that the results of the DBA test Pn$ sequences indicate that the " worst case" coating samples meet the 8 intent of ANSI N101.2 (1972), paragraph 1.4.2.2 in that the gg coatings will perform satisfactorily under the WCGS design basis asa.tn accident. After testing, coating samples were evaluated for flaking, delamination, peeling and blistering. It was observed that none of the coating samples exhibited signs of delamination, peeling, chalking, or flaking. Six of the twenty-six core M-Q

• O 201 N. Market - Wichita, Kansas - Mail Address: PO. Box 208 i Nchita, Kansas 67201 - Telephone: Area Code (316) 261-6451

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Mr. R.P. Denise page 2 sanples exhibited blister sizes which exceeded the ANSI N101.2 criteria for blister size. These six sanples were determined to be acceptable when evaluated with respect to the type of coating system, substrate, and the condition of the blisters after the coupletion of the DBA test sequence. In conclusion, it has been determined through testing and an engineering evaluation of test results that the coated concrete surfaces inside containnent will perform satisfactorily under NCGS Design Basis Accident conditions in accordance with the comnitnents described in the SNUPPS FSAR Sections 6.1.1.1.2 and 6.1.2.

Coatings removed from the elevation 2000'-0" floor inside Containment are presently being reapplied. If not coupleted prior to entering Mode Six this work will be suspended prior to entering Mode Six and then resumed and coupleted while in Mode Five. KG&E has reviewed the other activities scheduled during the same periods and has determined that no significant schedular, safety or technical impact will result from these recoating activities.

If you have any questions concerning this notter, please contact me or Mr. Otto Maynard of my staff.

Yours very truly, Y 151t/

Glenn L. Koester Vice President - Nuclear Gm:sjm cc: PO'Connor (2)

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