ML20042A421
| ML20042A421 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 03/08/1982 |
| From: | Mcgaughy J MISSISSIPPI POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, AECM-82-87, PDR-82-5, NUDOCS 8203230405 | |
| Download: ML20042A421 (3) | |
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e MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mitbissippi gusMMdig P. O.
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4 Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission ggg Region II Cl
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Attention:
Mr. J. P. O'Reilly, Regional Administrator M
Dear Mr. O'Reilly:
SUBJECT:
Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 i
l File 0260/15525/15526 PRD-82/05, Interim Report #1, l
CRD Housing Lower Support AECM-82/87 On February 5, 1982, Mississippi Power & Light Company notified Mr. Ross Butcher, of your of fice, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site.
The deficiency concerns l
nuts and jam nuts not threading properly onto the CRD housing lower supports.
Our investigation into reportability, cause, and extent is continuing.
l We expec* to submit a Final Report by April 16, 1982. Attached is our Interim Report.
Yours trul l
l J. P. McGaughy, Jr.
KDS:dr ATTACHMENT cc:
See page 2 l
8203230405 820308 PDR ADOCK 05000416 y,7AL COF9 S
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Member Middle South Utilities System (I
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Mr. J. P. O'Reilly AECM-82/87 NRC Page 2 cc:
Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner 1
Mr. Richard C. DeYoung, Director Office of Inspection & Enforcement J
U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. C. B. Taylor South Miss. Electric Power Association P. O. Box 1589 i
Hattiesburg, MS 39401 E
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.s Attachment to AECM-82/87 Page 1 of 1 INTERIM REPORT NO. 1 FOR PRD-82/05 I.
Description of the Deficiency Nuts and jam nuts will not thread onto the support rods for the CRD housing lower support.
All nuts and rods are affected although several nuts (approximately 20) will thread on with some difficulty.
(Their major thread diameter appeared to be slightly larger). With the.use of a tap and die the problem was corrected at several locations but it appeared that an excessive amount of metal was being removed.
The deficiency is known to affect Unit 1.
Investigations are being undertaken to determine applicability to Unit 2 and to analyze safety implications.
II.
Approach to Resolution of the Problem MP&L is working with our NSSS' vendor to determine cause of the deficiency, corrective actions, and actions to prevent recurrence.
It is known that all of the nuts and support rods are affected.
III.
Status of Proposed Resolution Safety implications, cause of the deficiency, corrective actions, and actions to preclude recurrence have not been determined.
This evalua-tion will be completed by our NSSS vendor.
IV.
Reason Why a Final Report Will be Delayed We are awaiting an evaluation of the deficiency by our NSSS vendor.
V.
Date When Final Report Will be Submitted We expect to submit a Final Report by April 16, 1982.
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