ML19312E969

Interim Deficiency Rept Re Internal Containment Coatings Having Loss of Adhesion Between Successive Layers of Coating Sys.Procedures & Testing Methods for Removal of Failed Coatings Under Preparation.Next Rept Will Be Sent by 800915

ML19312E969
Person / Time
Site:	Midland
Issue date:	06/11/1980
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
9125, NUDOCS 8006180266
Download: ML19312E969 (3)

Text

.

ConsumEIS L u Parler James W Cook g

COM$ Mnj Voce I'vesident, AfiJianJ Mject e

General of fices: 1945 West Parnall Road, Jackson, Michigan 49201 + (517) 788 0640 June 11, 1980 Mr J G Keppler, Regional Director Office of Inspection & Enforcement US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND PROJECT DOCKET NO 50-329, 50-330 CONTAINMENT INTERNAL STRUCTURES COATING DEFICIENCY FILE: 0.h.9 37 UFI: 73*10*01, 00210(S) Serial: 9125

References:

S H Howell letters to J G Keppler; Midland Nuclear Plant; Unit No 1, Docket No 50-329; Unit No 2, Docket No 50-330; Containment Internal Structures Coating Deficiency;

1) Serial Hove-309-79; dated December 13, 1979

2) Serial Hove-26-80; dated February 7, 1980

3) Serial Hove-75-80; dated April 15, 1980 This letter, as were the referenced letters, is an interim 50.55(c) report on in-containment coatings which have a loss of adhesion between successive layers of the coating system. The attachment to the letter provides the status of the actions being taken to resolve this condition.

Another report, either interim or final, will be sent on or before September 15, 1980.

e WRB/clh

Attachment:

MCAR-35, Interim Report #h, " Containment Internal Structures Coating," dated May 30, 1980.

CC: Director of Office of Inspection and Enforcement Att Mr Victor Stello, USNdC (15)

Director of Office of Management Information and Progrcm Control, USNRC (1) 8006180

Serial: 9125 Bechtel Power Corporation MCAR 35 .

Int 2 rim Report 4 Hay 30, 1980 Page 2 Summary of Actions to Determine Root Cause We believe Ta date, we have not been able to identify the root cause.

tha answer may be found in further ef forts to detect and identif y some f;rm of significant contamination on the failed coating.

We also believe the lack of adhesion may be the result of multiple fcetors that, when acting together, result in a condition which could We are preparing several coating application test cause delamination.

pancis under multiple adverse conditions in an effort to demonstrate dalamination.

The above information will be useful both in the determination of root cauce and to place suf ficient controls on the application of Coating System 9 to ensure an acceptable finished coating system.

Summary of Corrective Action We are preparing procedures and testing methods for removal of the fsiled coating and for surface preparation to receive the reapplication of the coatings.

Procedures are to be developed which will utilize information gained from the determination of root cause to ensure the cceeptable application and to prevent a recurrence of f ailed coatings.

Following reapplication of the coating, adhesion tests will be performed to demonstrate acceptability of the coating system.

Before proceeding with the actual work to repair Coating System 9 in i containment 2, we will submit the final results of our actions to determ ne root cause and our corrective action plans for repair of the deficient coatings for your information.

30, 1980.

The next report is ccheduled for August a g .%

+j}/"T1 - A P2hiff g JSC/TJM/ceb Submitted by .

FcR L.H Cv n;r ir.

Approved by: M- f Concurrence by: ./, 4 _ ~ 88

/

Attachment O )

Serial: 9125

~

Bechtel Power Corporation j

SUBJECT:

MCAR 35 (issued 11/13/79)  ;

Containment Internal Structures Coating .

INTERIM REPORT 4 DATE: May 30, 1980 l l

PROJECT:

Consumers Power Company  ;

Midland Plant Units I and 2 Bechtel Job 7220 Introduction This report updates project engineering's progress in evaluation and action regarding the failure of coatings on concrete, asmaintain building, to applied byadhesion cubcontractor J.L. Manta in the containment between successive layers of the coating system.

Update of Actions /Taken to Resolve MCAR 35

1. Quantify Extent of Physical Problem Results of adhesion testing indicate a random failure pattern on 2 coated with Coating System 9, with some walls in containment walls af fected more extensively than others. Approximately 17.7%

of the tests demonstrate insuf ficient adhesion.

2. Document Review Application docum?nts have beenWe reviewed have notandbec'n daily able data to.

hasidentify been plotted for coatir.g variables.

any significant correlation betwen the plotted variabl.es and the data from Item 1 above.

3. Material Analysis Material analysis to date has not yielded anyWe significant data to will be performing indicate the cause of the adhesion failure.

additional tests in an effort to detect and identify some form of contamination which could affect the coating adhesion.

4. Coating Acceptance Procedure The coating acceptance procedure will include the performance of adhesion tests to demonstrate the acceptability of the finished rereired coating.

_