ML20132D426
| ML20132D426 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 07/11/1985 |
| From: | Opeka J NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| F0777A, F777A, SD-81, NUDOCS 8508010003 | |
| Download: ML20132D426 (2) | |
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(203) 665-5000 July 11,1935 t
Docket No. 50-423 F0777A 1
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Dr. Thomas E. hiurley Regional Administrator U. S. Nuclear Regulatory Commission Region 1,
631 Park Asenue g
King of Prussia, PA 19406
Reference:
(1)
- 3. F. Opeka to T. E. Murley, F0734A,Jated May 10, 1935.
Dear Dr. Murley:
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Mill: tone Nuclear Power Station, tinit No. 3 Reporting of Potential Significarn Deficiencies in Accordance with 10CFR30.55(e):
Structural Steel Connections in the Main Steam Valve Building (SD-81) la an April 12,1985 telephone conversation between your Mr. T. Rebelowski and
,i our Mr. P. J. Quinlan, Northeast Nuclear Energy Company (NNECO) reported a potential significant deficiency in the construction of Millstone Unit No. 3 in
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accordance with 10CFR50.55(e).' The potential significant deficiencyin<olved structural steel connections in the Main Steam Valve Building (MSVB). As noted t
in Reference (1), we are hereby providing the following update.
Of the 96 previously reported deficient fixed-end connections, 31 have been dispositioned for re-work to the original design. Engineering has accepted the balance of the fixed-end connections as is. The 70 slotted connections with overtightened bolts were reworked to the original specifications.
If these conditions had remsined undetected, it ahpears that plastic deformation T
in members as well as we'.d failure could have ocprred due to either a severe temperature environment resulting from an crcadent condition or a safe shutdown earthquake event.
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Therefore, we consider this to be a significant'peficiency in accordance with 10CFR50.55(e).
t These conditions are expected to be limited to the MSYB. However, a sampling of connections in other QA Category 1 Building is still being performed to verify this.
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.... - As such, we are not able to provide a final report at this time. We will provide an update on this matter by August 29,1985.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY
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- 3. F. Obekh V
Senior Vice President cc:
Mr. 3. M. Taylor, Director Division of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555
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