ML20039A067

Submits Revised Response Re Results of Engineering Evaluation Conducted in Regard to Violations Noted in IE Insp Repts 50-413/81-08 & 50-414/81-08.Thin Uniform Rust Films Are Acceptable

ML20039A067
Person / Time
Site:	Catawba
Issue date:	10/01/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8112160191
Download: ML20039A067 (2)

Text

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• 4 '7 WILLIAM O. PARKER,JR.

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Mr. James' P. O'Reilly, Director

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. Region.II .S 101 Marietta Street, Suite 3100 2 Atlanta,= Georgia 30303

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.Re: RII:PKV .A 50-413/81-08 50-414/81-08 Ng Ni l_hc

Dear Mr. O'Reilly:

The following is a revised response transmitting the results of an engineering evaluation conducted in regard to Violation 413-414/81-08-03, which.was identified in the above referenced Inspection Report.

Flow orifice plates have been and will continue to be installed in accordance.

with Construction Quality Assurance Proce'dures M-4, M-55, and M-49. Procedure

,M-4 applies to Class A, B, and C pipe and references. Construction. Quality

-Assurance Procedure M-24 for cleanliness. Procedure M-55 applies to Class E pipe and refererices Construction Procedure CP-50 which in turn references Procedure M-24 for cleanliness. Procedure M-49 applies to Class'F pipe and-references Procedure M-24 for cleanliness. Procedure M-24 describes the cleanness acceptance criteria in which a quality control inspector _ visually.

inspects:the internal' surface of items being joined. _ By Section 6.2 of Pro-cedure M-24 carbon steel surfaces must meet the folicwing requirement:

iThin uniform rust films are acceptable. .The'following types are not acceptable: ,

1. Hard rust (rust which forms in a crusty film and tends to break off in flakes or pieces.)

2. Heavy rust ( a continuous film of appreciable thickness which forms due to lengthy exposure to aerated' water'or condensed moisture.)

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'Since all flow sections at Catawba Nuclear Station have been installed in' -l accordance with Construction Procedure M-24,'any rust degradation on.the

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j carbon steel flow sections.would be of the-thin uniform rust. film type.

The accuracy.. efforts of a thin layer of rust were discussed with various

, flow meter vendors.. All agree that the upstream and downstream sections

. essentially maintained their smoothness and are not affected by.a thin layer.

8112160191 811001 PDR ADOCK 05000413' i

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Mr.fJames F. O'Reilly, Director October-1, 1981 Page 2 of-rust. The error resulting from rust would not exceed one-half.of,a percent of total flow and is acceptable for adequate system performance. Therefore, the effects of rust degradation on installed sections are minimal and will not

' alter the acceptability of the eensurements.

I declare under penalty of perjury, that the statements set forth hecein are true and correct to the best of my knowledge.

Ve y truly yours,.

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William O. Parker, Jr.

RWO/php cc: NRC Rsident Inspector Catawba Nuclear Station O

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