United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for March 4, 2005

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Part 21 2005-0008 - Field Complaint About Masterpatch 240CR Concrete

Licensee/Facility:

FLORIDA POWER AND LIGHT
DEGUSSA

Dockets:

License No:
Notification:

MR Number: H-2005-0009
Date: 02/11/2005


Source Document: Letter

Reviewer: TABATABAI, OMID

Discussion:

Part 21 2005-0008 - Field Complaint About Masterpatch 240CR Concrete

On December 15, 2004, Florida Power and Light reported to Degussa, the vendor, that when Masterpatch 240 CR was applied, it did not harden properly and failed to achieve the expected strengths within the expected time frame (1 to 3 days). Masterpatch 240 CR repair concrete is a proprietary blend of Portland cement, graded aggregate and additives. This flowable repair concrete is suited for full depth repairs on horizontal and formed vertical or overhead surfaces. Reportedly, the material was shipped out and replaced by a new batch of Masterpatch 240 CR supplied by Degussa on December 16, 2004.

The material in question, prior to being shipped, had been tested twice by Degussa Construction Chemicals and had performed according to specifications both times. However, when the material was used in the field, it reportedly failed. Degussa was not advised by its customer how the Masterpatch 240 CR was being used. Degussa investigated the reported failure but has been unable to determine the cause of the problem.

To the best of vendor's knowledge, Florida Power and Light was the only customer within the last year licensed by the NRC purchasing this material. Their reporting of the problem to Degussa indicates their awareness of the issue. Unless Degussa discovers relevant new information, this letter will be its final notification.

Accession Numbers:

Accession No Accession Date
ML050460194 02/11/2005

Contacts:

Name Office Abbrev Phone No E-Mail
TABATABAI, OMID NRR (301) 415-6616 OTY@nrc.gov
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