ML20093H892

Final Potential Deficiency Rept 55-83-11 Re Laminations in 3/8-inch Steel Plates.Initially Reported on 831206.Design Drawings Reviewed to Determine Electrical Hanger Details Using Matls.Item Not Reportable Per 10CFR50.55(e)

ML20093H892
Person / Time
Site:	Clinton
Issue date:	07/13/1984
From:	Hall D ILLINOIS POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
55-83-11, U-10178, NUDOCS 8407250358
Download: ML20093H892 (4)

Text

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e , /Mn h1 1605-L ILLINDIS POWER COMPANY U-10178 CLINTON POWER STATION. P.O. BOX 678. CLINTON. ILLINOIS 61727 July 13, 1984 Docket No. 50-461 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 55-83-11 Laminations in 3/8" Steel Plates

Dear Mr. Keppler:

On December 6, 1983, Illinois Power notified Mr. F. Jablon-ski, NRC Region-III (Ref: IP Memorandum Y-18894, dated December 6, 1983) of a potentially reportable deficiency per 10CFR50.55(e) concerning laminations found in 3/8" thick steel plates supplied to Clinton Power Station (CPS) for use in electrical hanger applications. This initial notification was followed by two (2) interim reports (Ref: IP letter U-10ll8, D. P. Hall to J. G.

Keppler dated January 10, 1984: and IP Letter U-10142', D. P. Hall to J. G. Keppler, dated April 13, 1984). Illinois. Power's investigation of the above matter is complete and has determined that the issue does not represent a reportable deficiency under 10CFR50.55(e). This letter is submitted as a final report, regarding this potentially reportable deficiency.

Statement of Potentially Re3ortable Deficiency (Withdrawn)/Baciground During lighting fixture installation in a non-seismic area of CPS, a craftsman discovered a 3/8" x 8" x 8" steel plate with a pronounced lamination. Examination of other uninstalled plates of-the same heat number uncovered additional examples of visible

-laminations. Review of material requisitions indicates that some of the materials were issued for use in seismic areas of CPS. An evaluation of this issue was performed to determine the extent of-this problem, locations of potentially defective steel plates, and the significance of the issue on the operational safety of-CPS.

Investigation Results/ Corrective Action Illinois Power has prepared and implemented an investigation plan to determine the extent and location of the suspect plate material. Investigations-completed to date have identified the following information:

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1. One thousand.(1,000) 3/8" x 8" x 8" plates and five hundred (500) 3/8" x 12" x 12" plates of heat No. j 486K2790 have been received at CPS. Examination of heat number computer logs maintained at CPS showed that

. no other materials with this heat number have been received at CPS.

2. The 500-12" plates were received on August 17, 1981, as documented on Receiving Inspection Report S-14654. The T

1,000-8" plates were received on October 12, 1981, as documented on Receiving Inspection Report S-15056.

l 3. The material was purchased by Baldwin Associates (CPS Constructor) from Interstate Steel Supply (Philadel-phia, PA) by Purchase Orders C-32391- (12 ' plate) and j C-33251 (8" plate). The material was purchased as i safety-related to.the requirements of ASTM A-36, for use in electrical hanger applications.. Certified material test reports were received with the shipments, and showed Bethlehem Steel Corporation as the material manufacturer.

4. Upon identification of this issue,-Nonconformance- t Reports (NCRs) 12149, 15579, and 15580 were written.

4 Unissued plates of the suspect heat number were purged from CPS and_placed on hold. An inspection of uninstal-led plates, consisting of 524 - 8" plates and 352 - 12" plates, was performed. A total'of 12 - 8" and 6 - 12" uninstalled plates were found with visible laminations.

The following actions were taken to determine.the. locations of potentially defective plates at CPS:

1. A review of design drawings was performed to determine.

electrical hanger details that use the specific _ sized 7 materials.

2. A review of approximately 1,700 electrical hanger

installation travelers issued since the-receipt of the

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suspect material and which specified the'affected details was performed. This review identified approxi-mately ninety (90) hangers that may have used material j from~the suspect heat number.

3. A visual inspection of hangers identified es using the

suspect: material:was performed. No visible defects ~

.were found in.the plates-used..

Since the initiation'of the subject investigation', an additional _Nonconformance Report, NCR 15559, was written to document lamination found in one (1) 3/8" x 8" x 8 .

plate of a-idifferent. heat number, HT 492N0492. Further investigation of-

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-Mr.l James G. Keppler Page 3 July 13, 1984 Lthisicase was performed under this potential 10CFR50.55(e) investigation to determine if the occurrence was isolated or generic to the shipment.

The investigation of NCR 15559 was limited to examination of uninstalled plates with heat 492N0492. The inspection report (E84-1645) states "no signs of lamination or delamination were visible". Based on the results of this report, there was no traveler search performed to locate seismic hangers constructed, using' plates of this heat number.

To prevent the installation of the suspect plate materials, uninstalled plates of Heat Number 486K2790 and 492N0492 were purged from construction areas and isolated at CPS until further investigation of_the issue was performed. An evaluation of receipt inspection controls for this type of material was also conducted to determine if. improvements were_necessary. However, evaluation of the installation inspection. program showed that adequate controls presently exist to identify defective plate materials used in safety-related electrical hanger installations.

A sample of-10-plates was sent off-site for nondestructive testing. The results (NDT lab report dated 4/10/84) support the on-site visual evaluation of the 8" x 8" plates, but indicates that the 12" x 12" plates were not rejectable under the guide-lines of AWS D1.1, Section 3. 1 There were no obvious defects on the 12" x 12" plates.

Apparently the edge rollover, that sometimes occurs during.the shearing process, was perceived as lamination on these plates.

The original purpose of the off-site examination was to provide preliminary data for nondestructive examination of.all plates in the QC hold area. The examination of all plates was later deleted as an investigation action'and documented,by the revision _to the investigation plan, dated May 29, 1984.

Per AWS Dl.1, it is the responsibility'of the personnel involved in7the_ installation process _(both craft and_ Tech.

Service):to: reject plate material when it exhibits certain: types

-of-defects. As indicated by.the NCRs written,zthis is being accomplished. Craft personnel found defective plates and noti -

fied'QC in accordance with site procedures; The results of the1 investigation indicate.that.the installa-tion process is being conducted.in accordance with'the require-ments of AWS Dl.l.: +

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.Mr. Jcm:s G. Koppler Page 4 July 13, 1984 Safety Implications / Significance Investigation.of this potentially reportable issue is complete. Illinois Power Company has reviewed and evaluated the findings of the investisa tion and has determined that no condi-tions, adverse to the safe operations of. CPS were found. There-

' fore, this issue is considered to be not reportable under the provisions of 10CFR50.55(e).

4 Ue trust that this final report provides sufficient back-ground information to perform a general assessment of this potentially reportable deficiency, and adequately describes our overall approach to resolve this issue.

Sincerely yours, D. P. Hall Vice President RLC/cbs (NRC) cc: NRC Resident Office Director-Office of I&E, USNRC, Washington, DC 20555 Illinois Department of Nuclear Safety INPO Records Center