ML20106B444

Amend to Final Potential Deficiency Rept 55-82-09 Re Small Bore/Instrumentation Piping & Conduit Support Design Calculations.Initially Reported on 840615.Reduction to 20 Randomly Selected Calculations Per Quarter Underway

ML20106B444
Person / Time
Site:	Clinton
Issue date:	01/29/1985
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-10244, NUDOCS 8502110611
Download: ML20106B444 (2)

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-lLLIN0/8 POWER COMPANY 1A.120 s ((J U-10244- 1 CLINTON POMR STATION. P.O. BOX 678. CLINTON, ILLtNOIS 61727 l January 29, 1985 Docket No. 50-461 Mr. James G. Keppler-Regional Administrator Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 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 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 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 Sargent & Lundy (S&L) during each month, to monitor techni-cal adequacy of the calculations. This plan will be adjust-ed as experience is gained with the quality of the new calculations."

Based on the experience gained with the quality of the new calculations, the technical reviews of the conduit support.

calculations are being adjusted as follows:

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.

8502110611 850129 PDR ADOCK 05000461 S PDR FEB AM i 9 3 W,

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.e 9 J. G. Keppler January 29, 1985

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 'ru; 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 twenty (20) to eight (8) per one hundred calculations over the review period, March 1983 thru May 1984.

- NSED conducted a conduit support calculation review for the quarterly period of June, July and August 1984. Twenty (20) randomly selected support calculations were reviewed with two (2) concerns identified; neither of which resulted in a hardware change. The resulting ten (10) concerns per one hundred calculations is consistent with the decrersing trend as indicated above. .

In addition, Sargent & Lundy has 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 clarify the ongoing corrective action associated with this potentially reportable deficiency.

1 Sincerely yours, l

. . Hall Vice President RLC/lr (NRC2) cc: NRC Resident Office

. Director.- Office of I&E, US NRC, Washington, DC

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20555 Illinois Department of Nuclear Safety IUP0 Records Center.