ML20117C722

Final Potential Deficiency Rept 55-85-01 Re Substitution of Carbon Steel All Thread Rod AISI-1010 for ASTM A-36. Initially Reported on 850201.Substituted Rod Acceptable. Condition Not Reportable Under 10CFR50.55(e)

ML20117C722
Person / Time
Site:	Clinton
Issue date:	04/25/1985
From:	Hall D ILLINOIS POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
55-85-01, 55-85-1, U-10271, NUDOCS 8505090507
Download: ML20117C722 (4)

Text

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. pine ILLINO/S POWER COMPANY 1A.120

[8 U-10271 CLINTON POWER STATION P.O. BOX 678, CLINTON, ILLINOIS 61727 April 25, 1985 Docket No.'50-461 Mr. James G. Keppler Regional Administrator Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 Subj ect: Potential 10CFR50.55(e) Deficiency 55-85-01 Substitution of AISI-1010 Carbon Steel All Thread Rod for ASTM A-36

Dear Mr. Keppler:

On February 1, 1985, Illinois Power Company notified Mr. R.

~

JKnop, NRC Region III-(Ref. IP memorandum Y-26072 dated February 1,.1985) of a potentially reportable deficiency concerning the indeterminate quality of certain carbon steel all thread rod.

This initial notification was followed by one (1) interim report (Ref: IP letter U-10251, D. P. Hall to J. G. Keppler, dated February 28, 1985). Illinois Power's investigation of this matter is complete. Our investigation identified, documented and evaluated for adequacy, those electrical installations which utilized the subject AISI-1010 carbon steel threaded rod. Our investigation into this matter has determined that this issue does not represent a reportable deficiency under the provisions of 10CFR50.55(e). This letter is submitted as a final report in accordance with the requirements of 10CFR50.55(e). Attachment A provides the details of our investigation.

We trust that thisifinal report provides you sufficient

-background information to perform a-general assessment of this potentially reportable deficiency and adequately describes our overall approach to resolve this issue.

Sincerely yours, D. . Hall Vice President RLC/lr (NRC2)

Attachment cc: NRC Resident Office Director, Office of I&E, US NRC, Washington, DC 20555 Illinois Department of Nuclear Safety INPO Records Center I

8505090507 850425 I PDR ADOCK 05000461 APR 2 91985 lI S PDR gy

E ATTACHMENT A J

Illinois Power Company Clinton Power Station ll Docket No. 50-461 Potential 10CFR50.55(e) Deficiency 55-85-01 Substitution of AISI-1010 Carbon Steel 4

All Thread: Rod for ASTM A-36 Final Report Statement of Potentially Reportable De'ficiency/ Background Baldwin Associates'(BA) Quality Engineering Procurement Department identified a deficiency with threaded carbon steel i rod,-the quality of which was indeterminate (Ref. Nonconformance

- Report:(NCR) No. 70456). The identified deficiency involves vendor-(Barr Saunders, Inc.) supplied AISI-1010 carbon steel threaded rod, 3/8" (HT fHC0032) and 1/2" (HT fHC0148) in E diameter. The AISI-1010 carbon steel' rod-was supplied by the vendor in lieu of ASTM A-36 which was specified on purchase order-

- (PO), #C-30428. AISI-1010 carbon steel rod'has lower physical properties (tensile and yield strength) than A-36.. This material was utilized in safety-related electrical. installations.

Investigation Results Illinois Power prepared and implemented an investigation plan to determine the extent of this deficiency at Clinton Power Station.(CPS). The investigation plan included:

1. A review of the material specification / tensile requirements for AISI-1010 and ASTM A-36 material was performed.

2. A review was performed by Baldwin Associates Resident Engineering (BARE) to identify the electrical installation details utilizing threaded rod, reference E05-1200, E05-1900 and E06-1000 Series Drawings.

3. The identified installation details were provided to Sargent and Lundy (S&L) for evaluation of design-requirements and assessment of the use of AISI-1010 rod

in lieu of ASTM A-36 material.

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a e

ATTACHMENT A

(continued)

'A review of purchase orders. issued to Barr.Saunders, Inc..

was performed and the following'AISI carbon. steel material was

. supplied in lieu of ASTM A-36 which was specified on the purchase order:-

PO #C-33584 Qty . -Qty Grade & Size Purchased on Hold AISI-1008 . 1/4"x 6' (HT #39884) 10 0 AISI-1008 3/8"xc6' (HT #20845) 10 .

O AISI-1010- 5/8"x 6' (HT #20929) 20 1 AISI-1010 3/4"x 6' l(HT fHC0652) 20 .O AISI-1010 1"x 6' (HT-fHC0806) 20 12-LAISI-1020 - 1 1/8"x 6',x7' (HT #211239) 27 19(6')

NOTE: The above material was purchased for the Millwright Department to be used in temporary installations only and was not utilized in safety-related applications (Ref: Letter SGL-115-85 R/1, dated March 18, 1985).

PO #C-32734 AISI-1010 3/8" (HT #SY1077)

AISI-1010 1/2" (HT fKC5964)

NOTE: Purchasing requisition 191261 specified that the grade of material was to be' ASTM A-36, but P0

1. C.32734 did not specify the grade of material required other than carbon steel (Ref. NCR.No.

27243).

A' subsequent review of all issued purchase orders for threaded rod.was performed. NCRs were initiated for quality-related and safety-related aurchase orders (Ref. NCR Nos.

28731,-28732 and 70771). All NCRs have been resolved and closed.

A review to idencify those electrical installation details which utilize threaded rod procured on PO #C-30428-(1/2" & 3/8")

was performed by BA' Resident Engineering,-(Ref. Letter JSA-15-85 dated February 14, 1985). A list of installation details was ~

provided to S&L for' evaluation of design requirements and for

' assessing the impact.of utilizing AISI-1010 rod in lieu of ASTM A-36 material.

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Corrective Action An evaluation of design requirements was performed by S&L in order to evaluate acceptability of AISI-1010 in lieu of ASTM A-36 material for electrical installation-details. This evaluation indicates that the identified details are acceptable with the lower strength of AISI-1010 carbon steel rod. This review also indicated that electrical enclosure installations per details 44-1, 44-2 and 44-5 on drawing E05-1200 must be within the new limits as-provided on Field Engineering Change Notice (FECN) 8386. (Ref. Letter SLS-I-4960, dated February 27, 1985).

Field Engineering Change Notice 8386, was issued by S&L to add minimum centerline rod dimensions for electrical enclosure details 44-1, 44-2 and 44-5. These new dimensions will control the future use of these details.

An evaluation of minimum center line rod dimensions for past

. electrical enclosure installations was performed by BA Resident Engineering, and it has been determined that none are less than the minimum required by FECN 8386, (Ref. Letter SGL-170-85, dated April 11, 1985).

Safety Implications / Significance Illinois Power's investigation of this matter is complete.

Sargent & Lundy has evaluated the safety significance of this issue and has stated, based on their calculations, that all identified details are acceptable with AISI-1010, which has a lower yield and tensile strength than A-36 carbon steel rod (Ref.

Letter SLS-I-4960, dated February 27, 1985). Illinois Power has reviewed and evaluated the findings associated with this investigation and has concluded that the issue does not represent a reportable condition under the provisions of 10CFR50.55(e).

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