ML20067B226

From kanterella
Revision as of 13:43, 6 September 2020 by StriderTol (talk | contribs) (StriderTol Bot change)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search
Requests Approval of Encl Description of Proposed Phase 2A-2 of Insp of Structural Steel,Insp of Remainder of Uninspected Fixed Connections & Reinsp of Expansion Connections in Containment.Deficiency Rept Filed.W/O Encl
ML20067B226
Person / Time
Site: Clinton Constellation icon.png
Issue date: 11/23/1982
From: Hall D
ILLINOIS POWER CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
4250-L, NUDOCS 8212060093
Download: ML20067B226 (2)


Text

-

r 4250-L ILLINDIS POWER 00MPANY IP CUNTON POWER STATION, P.O. BOX 678. CLINTON. ILLINOls 61727 November 23, 1982 Docket 50-461 Mr. James G. Keppler Regional Administrator Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

On September 24, 1982 the NRC approved a partial release of Stop Work Order 19, Containment Structural Steel, to allow reinspection of fixed connections in five quadrants of the containment. This partial release was labeled 2A-1 and was completed on October 22, 1982; the complete report is attached.

Partial release 2A-1 consisted of inspection of 449 fixed connections in the five quadrants of containment where drawings were inadvertently destroyed. Inspection of the 9 drill-and-tap connections tangential to box girders in release 2A-1 identified 4 connections with oversize holes that had not previously been identified as non-conforming. These four connections will be re-paired by welding. Consequently the remaining 28 of this type of connection already installed will be inspected and evaluated for potential corrective action in phase 2A-2. However, since the reinspection in release 2A-1 was performed as a result of lost documentation, it is not possible to determine if the 4 non-conforming connections had been previously inspected. With this exception the quality of the fixed connection installation has -

been proven to be in conformance with applicable requirements.

A potential 10CFR50.55(e) has been filed with the NRC concerning beam to box girder drill-and-tap connections. While these connections were found to be in conformance with applicable drawings, the adequancy of existing inspection criteria to assure sufficient thread engagement exists for the development of bolt strength is being questioned. This will be evaluated and resolved.

t 8212060093 821123 H0y 2 6 66b PDR ADOCK 05000461 G PDR g

Mr. J. G. Keppler 8 Page Two of Two Contained within the enclosure is a description of the proposed phase 2A-2 of structural steel inspection, inspection of the remainder of the uninspected fixed connections and ,

reinspection of the expansion connections in containment.

Your review and approval of this well-defined and limited scope of work is requested.

Sincerely, Vice President LSB/jb cc: NRC Resident Inspector Director-Quality Assurance Director-Office of I&E, US NRC, Washington, DC 20555

Illinois Department of Nuclear Safety i

i t

i i

L