U-600480, Amend to Final Deficiency Rept 55-82-09 Re Small Bore/ Instrumentation Piping & Conduit Support Design Calculations.Reviews of Conduit Support Calculations Reduced to 20 Calculations Per Quarter

Amend to Final Deficiency Rept 55-82-09 Re Small Bore/ Instrumentation Piping & Conduit Support Design Calculations.Reviews of Conduit Support Calculations Reduced to 20 Calculations Per Quarter

ML20210C565
Person / Time
Site:	Clinton
Issue date:	03/18/1986
From:	Hall D ILLINOIS POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
55-82-09, 55-82-9, U-600480, NUDOCS 8603260069
Download: ML20210C565 (2)

Text

U-600480-b L14-86 ( 03 -as ) .L 1A.120 ILLINDIS POWER COMPANY

. IP CLINTON POWER STATION. P.O. BOX 678. CLINTON. ILLINOIS 61727

[

J Docket No. 50-461 '

March 18, 1986 Mr. James G. Keppler {

Regional-Administrator ,

Region III

.U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 ,

Subject:

Potential 10CFR50.55(e) Deficiency 55-82-09: .;

Small Bore / Instrumentation Piping, and  !

Conduit Support Design Calculations [

Dear Mr. Keppler:

In Illinois Power's final report on the subject potentially a reportable issue (Ref: IP Letter U-10143, D. P. Hall to'J..G.

.Keppler, dated June 15, 1984), Illinois Power.(IP) committed to ,

the following, concerning conduit support calculations:

" Illinois Power Nuclear Station Engineering Department (NSED) has developed and implemented a plan to perform on-going technical reviews of 10%, or a minimum of one (1)

,! per building, of conduit support calculations performed by -

4 Sargent & Lundy (S&L) during each month, to monitor techni- 1

. cal adequacy of-the calculations. . This plan will'be adjust-ed as experience is gained with the quality of the new l 4

calculations."

Based on the experience gained with the quality of'the new 3 calculations, the technical reviews of the conduit support  ;

calculations were adjusted in January 1985 as follows (Ref: IP ~;

Letter U-10244, D. P. Hall to J. G. Keppler, dated January 29',- 3 1985):

1. Reduced to twenty-(20)-randomly. selected calculations per quarter, and

2. Re-evaluated in approximately six (6) months for further adjustment or elimination of the review re-quirement.

8 8603260069e6y0 ADOCK O 461 PDR PDR S

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o S' U-600480 e Ll4-86(03 48 )-L 1A.120 Based on the acceptable results of Illinois Power's continuing technical reviews of the conduit support calculations, the conduit support calculation review program was concluded, ending with the review of the June / July / August 1985 calculations.

Neither the NSED nor the S&L conduit support calculation review program identified an error or discrepancy that resulted in a hardware change. Illinois Power's commitment regarding Potential Deficiency 55-82-09 to assure technical adequacy of the S&L conduit support calculations has been met.

Background

Illinois Power's Nuclear Station Engineering Department (NSED) commenced the ten (10) percent monthly conduit support calculation review with March 1983 calculations. In the process of these reviews, any information found in the calculation that did not support the "as designed" condition of the conduit support (e.g., a non-conservative span dimension, use of incorrect load table) was identified as a concern. All concerns have been addressed to Sargent & Lundy (S&L) for evaluation and response. None have required a hardware change.

A trend analysis, using a mean average curve, indicates a decline in the number of concerns, from approximately seventeen (17) to nine (9) per one hundred calculations over the review period, March 1983 thru August 1985.

In addition, Sargent & Lundy established a generic technical monitoring program which includes a review of conduit support calculations. Reports are generated quarterly and there have been no findings that require a hardware change.

We trust that this amendment to the subject final report provides sufficient information to perform a general assessment of the corrective action that was associated with this potentially reportable deficiency.

Sincerely yours,

. . all Vice President RLC/ asp cc: NRC Resident Office Director - Office of I&E, US NRC, Washington, DC 20555

- Illinois Department of Nuclear Safety INPO Records Center