ML19338G149

Interim Deficiency Rept Re Inadequate Const Controls & Electrical Raceway Hanger installation.Sixty-eight Hangers Found to Deviate from Design Requirements.Sixteen Deviations Attributable to Inadequate Raceway Installation Procedures

ML19338G149
Person / Time
Site:	Clinton
Issue date:	10/20/1980
From:	Gerstner W ILLINOIS POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E3, 10CFR-50.55E, U-0189, NUDOCS 8010280505
Download: ML19338G149 (2)

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U-0189 ILLINOIS POWER COMPANY n L14-80(10-20)-9 M.P 'r 500 SOUTH 27TH STREET. DECATUR. ILUNOIS 62525 October 20, 1980 Mr. James G. Keppler .

Director, Region III Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

Clinton Power Station Unit 1 Docket 50-461-Construction Permit CPPR-137 On September 16, 1980, Illinois Power Company verbally notified Mr. H. M. Wescott of a potential reportable deficiency involving inadequate construction controls and electrical raceway hanger installation. Illinois Power Company has conducted an investigation into this matter and finds that the deficienc suant to the provisions of 10CFR50.55(e)(iii)y is reportable pur-This is an interim report describing the results of our investiga-tion and the corrective action taken to date. A final report will '

be submitted within sixty days.

l. Statement of Reportable Deficiency Some completed (constructed and inspected) and in-process (in various stages of construction or constructed and not inspected) electrical raceway hangers were found to be in non-conformance with approved current revision design documents. At that time approximately 1,700 had been completed, 1,400 more hangers were awaiting final inspection, and 5,000 hangers were under construction.

2. Investigation Results The investigation included (1) a survey to ascertain hanger compliance to applicable design requirements and (2) review of raceway installation controls, particularly the design revision processing mechanism and the traveler system.

One hundred ninety (190) completed and in-process raceway hangers were inspected for conformance to the latest revision design documents. Sixty-eight (68) completed and in-process hangers were found to deviate from the design requirements.

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U-0189 Ll4-80(10-20)-9  :

Mr. James G. Keppler October 20, 1980 Page 2

, 2. Investigation Results (continued)

Sixteen (16) completed hangers had revisions to details that i had not been implemented. The sixteen (16) deviations are attributable to the inadequac -

procedures to provide for (1)yanofaccurate the raceway installation record of the detail used, (2) identification of design revisions to completed hangers, and (3) implementation.of revisions to completed hangers.

Deviations to in-progress hangers occurred because of the com-plexity of the engineering-to-construction interface, which required field reference to nucerous design documents and field control of detail alternate selection. '

3. Corrective Action Issuance of travelers for safety-related hangers in all areas except containment was suspended on Septenber 16, 1980. Sub-sequently, installation procedures and controls were modified to assure that hanger installation would conform to current drawing requirements and that post-installation and design changes (if any) would be incorporated and documented in all applicable Cases.

Installation work was resumed under revised controls on September 22, 1980. Additional corrective action to backfit the earlier work

' and to fully implement future possible design changes is still being developed and will be implemented in a timely manner.

l When the limited corrective action which is still being developed as described above and a final evaluation of the potential safety 1

' implications (had this problem gone undetected) have been developed, the final report on this deficiency will be filed in accordance with applicable regulatory requirements.

Sincerely, W. C. Gerstner Executive Vice President dl cc: H. H. Livermore, NRC Resident Inspector Director, Office of I&E, NRC, Washington, D.C.

Director-Quality Assurance

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