ML19323A542

Interim Deficiency Rept Re in-containment Coatings W/ Adhesion Loss Between Successive Layers of Coating Sys.Root Cause Under Evaluation.Coating Acceptance Procedure Being Developed.Bechtel Rept Encl

ML19323A542
Person / Time
Site:	Midland
Issue date:	04/15/1980
From:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
HOWE-75-80, NUDOCS 8004210318
Download: ML19323A542 (3)

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C0mpDy Senior Vice President Generet of fices: 1945 West Parnali Road, Jackson, Michigan 49201 e (517) 7864453 April 15, 1980 Howe '(5-80 Mr J G Keppler , Regional Director Office of Inspection & Enfe cement US Huclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND NUCLEAR PLANT UNIT NO 1, DOCKET NO 50-329 UNIT NO 2, DOCKET NO 50-330 CONTAINMENT INTERNAL STRUCTURES COATING DEFICIENCY

References:

S H Howell letters to J G Keppler; Midland Nuclear Plant; Unit No 1, Docket No 50-329; Unit No 2, Docket N o 50-330; Containment Internal Structures Coating Deficiency; i) Serial Howe-309-79; dated December 13, 1979

2) Serial Howe-26-80; dated February 7, 1980 This letter, as were the referenced letters, is'an interim 50.55(e) report on in-containment coatings which have a loss of adhesion between successive layers of the coating system. She 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 June 16, 1980.

WRB/1r .

Attachment:

MCAR-35, Interim Report #3, " Containment Internal Stnictures Coating," dated March 31, 1980 CC: Director of Office of In @ ection and Enforcement Att Mr Victor Stello, USNRC (15)

Director of Office of Management Information and Program Control, USNRC (1) 80 0.4 21 os 1 a

Attachment to

- Howe-75-80 Bechtel Associates Professional Corporation i

SUBJECT:

MCAR 35 (issued 11/13/79)

Containment Internal Structures Coating INTERIM REPORT 3 DATE: MARCH .31,,1980 PROJECT: Consumers Power Company Midland Plant Units 1 and 2 Bechtel Jeb 7220 ,

This report updates project engineering's progress in evaluation and action regarding the failure of coatings on concrete, as applied by subcontracto'r J.L. Manta in the containment building, to maintain adhesion between successive layers of the coating system. ..

The corrective actions identified in Interim Reports 1 and'2 are now progressing with a program involving C nsumers Power Company, Bechtel, and Manta. A short update of these programs follows. .

1. Quantify Extent of Physical Problem The procedure for mapping and adhesion has been approved.  ;

Approximately 90% of the walls in containment Number 2 coated with '

System 9 have been tested and the results are being logged and plotted on wall elevation drawings. The results of this testing are being used to identify the extent of the coating failure and for correlation with other data (Items 2 and 3) to determine root cause.

2. Document Review Documents are continuing to be reviewed and evaluated. Application records have been reviewed and coating data concerning daily application, batch nu=bers, application temperatures, and time between coats have been plotted on wall elevation drawings. These  !

, data are being compared with testing data from Item 1 and being reviewed against other documents and data as applicable.

3. Material Analysic Coating materials are continuing to undergo investigation. Retained coating batches, analysis of, failed and unfailed coating samples, and coating application tests have been identified for analysis and are in various stages of completion. .

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Bechtel Associates Professional Corporation HCAR 35 (Interim Report 3) ,

Page 2 I

4. Coating Acceptance Procedure However, this A coating acceptance procedure is being developed.

will not be finalized until completion of studies to determine the extent and the root cause of the coating failure.  !

While neither the full extent nor the root cause of the failure haveto j been determined, data are being evaluated continuously in an effort reco1ve this concern. Upon completion of all planned investigations, a thorough analysis of the r'ata vill proceed to determine both the cause and extent of the subject coating failure prior to the completion of the remaining System 9 coating work.

The next report is scheduled for May 30, 1980, and preliminary investi-gations included in Items 1, 2 and 3 above are expected to be completc.d at that time'.

Submitted by: . h< @@6N Approvedby:K.N,yd! A 1..M.foitru Concurrence by: ,

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