Part 21 Report - 1998-521

ACCESSION #: 9810070222

Telephone: 630-226 4900
Fax 630 226-4646



October 2, 1998

U.S. Nuclear Regulatory Commission
Washington, DC 20555

Attention: Document Control Desk
Subject: Discovery of a Defect as defined by 10CFR21

Dear Sir or Madam:

CRANE Nuclear Inc. has made a discovery of a condition or circumstance involving a basic component that could contribute to the exceeding of a safety limit.

During the manufacture of a replacement 10" figure N-2376 swing check valve, it was found that the weight of the replacement valve was significantly different from the value shown on the drawing for the original valve. The replacement valve weighs 490 lb., while the Aloyco drawing from 1970 shows the valve as 346 lb. The replacement valve did not ship to the intended customer because of this discrepancy.

Preliminary investigation suggests that the original weight value is not correct, and that the weight of the valve is close to that of the replacement. The weight of the valve from the drawing may have been used in the calculation of piping stresses or for other purposes by the utility. The discrepant weight is isolated to the 10" size of this figure number.

Crane Company acquired Aloyco in 1984. This is the first time a valve of this size and figure number has been manufactured by Crane Nuclear, Inc.

CRANE Nuclear Inc. is reviewing records to determine all customers that may be affected, and will send written notification to them in accordance with CNI procedure 15-100 and 10 CFR,Part 21.

If you have any questions concerning this matter, you may contact me by telephone at (630) 226-4940 or via E-mail at .


CRANE Nuclear, Inc.

Rosalie Hillis
Manager of Quality Assurance


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