ML20092P025

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Responds to NRC Re Violations Noted in IE Insp Repts 50-424/84-04 & 50-425/84-04.Util Maintains That Results of Tests Performed 1 Month After Installation Not Valid Justification to Question Installation
ML20092P025
Person / Time
Site: Vogtle  Southern Nuclear icon.png
Issue date: 05/18/1984
From: Foster D
GEORGIA POWER CO.
To: Robert Lewis
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20092P022 List:
References
GN-362, NUDOCS 8407050326
Download: ML20092P025 (2)


Text

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Georg'a Power Corrovy Robte 2. Box 299A Waynesboro, Georg.a 30830 Telephone 404 554 9961. E xt 3360 404 724 8114. Est. 3360 L k o.o.rou.' Georgia Power 84 MAY 24 A S : 20 the Southern e'eCtrl SyS!em pr e

. Vogue Project May 18, 1984 United States Nuclear Regulatory Commission Office of Inspection and Enforcement File: X78G10 Region II - Suite 3100 Log: GN-362 101 Marietta Street Atlanta, Georgia 30303

Reference:

50-424/84-04,50-425/84-04 Attention: Mr. R. C. Lewis Gentlemen:

Further to our letter dated April 9,1984 (File: X7BG10, Log: GN-341), concerning the violation discussed in your inspection report 50-424/

84-04 and 50-425/84-04, Georgia Power Company wishes to submit the follow-ing additional information:

. Violation 50-424/84-04-01, " Failure to Follow Frocedure for Concrete Expansion Anchor Inspection" - Severity Level V.

Georgia Power Company denies the alleged violation.

Paragraph 6.b of the Inspection Report Details describes testing per-formed on concrete expansion anchors in three safety-related base plates. One anchor in each of two plates was found to require addi-tional nut rotation (1 1/2 and 1/3 turns respectively) in order to achieve the specified minimum torque values. Based on these results, the NRC Inspector postulated that the required torque values had not been attained during original. installation. Two failures to follow procedure were cited:

1. Portions of the concrete expansion anchors were not installed by the craftsmen in accordance with the specified procedures.
2. Quality Control inspectors failed to verify the required torque values for the two concrete expansion anchors.as required by field procedure GD-T-27.

Georgia Power Company identified the conditions of the two concrete

l. -expansion anchors in question in Deviation Report CD-5438. The deviation report was forwarded to the Vogtle Project Architect /-

, W D obN4 PDR ,

l Mr. R. C. Lewis 50-424/84-04,50-425/84-04 Page Two l

l Engineer, Bechtel Power Corporation, for an engineering evaluation and disposition. The deviation report was voided by Bechtel in accordance with project procedures for the following reasons:

1. The reported deviation is not a violation of any construction specification, procedure, drawing, or design document.
2. The additional rotation of the anchor nuts required to achieve torque test value is a result of the loss of anchor preload.

Loss of preload torque in concrete expansion anchors is an industry-recognized occurrence and studies have shown that it does not adversely affect the load capacity of the anchor.

3. Bechtel design guide C-2-40 for concrete expansion anchors provides for anchor relaxation.
4. The original inspection reports for the two anchors in question document that procedural acceptance criteria were met at the time of installation.

Ceorgia Power Company Engineering concurs with Bechtel's evaluation.

The testing witnessed by the NRC Inspector was conducted one month and.two months respectively after installation and inspection of the two anchors. Georgia Power Company maintains that the results of tests performed one month after installation, considering the effects of anchor relaxation, is not valid' justification to question the ini-

-tial installation and inspection.

This response contains no proprietary information and may be placed in the NRC Public Document Room.

4 Yours ruly, j D. O. Foster REF/D0F/tdm xc: .U. S. Nuclear Regulatory Commission ATTN: Victor J. Stello, Jr., Director Office of Inspection and Enforcement Washington, D. C. 20555 xc: R. J. Kelly D. E. Dutton J. A. Bailey. L'. T. Gucwa R. E. Conway. W. F. Sanders 0. Batum _.

.M. Malcom G. F. Head R. H.-Pinson H. H. Gregory, III 'G. Bockhold-J. T. Beckham- 8. M. Guthrie_ C. W. Hayes P. D. Rice

.D. N. MacLemore R. A. Thomas E.-D. Groover ~J. L. Vota

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