ML20003F180

Interim Deficiency Rept 2 Re Discrepant Slopes in Instrument Process Tubing,Initially Reported on 801230.Reinsp of Instrument Process Tubing in Progress.Slope Requirements Revised.Final Rept to Be Submitted by 810812

ML20003F180
Person / Time
Site:	Grand Gulf
Issue date:	04/14/1981
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-81-144, NUDOCS 8104200362
Download: ML20003F180 (4)

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,/ / MISSISSIPPI POWER. & LIGHT COMPANY

'. Helping Build Mississippi EnhWMang P. O. B O X 1640. J ACK S O N. MIS SIS SIP PI 3 9 2 0 5 J AMES P. McGAUGHY, JR. ,s ass sta=r vica msiocur April 14,1981,ge,, s

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/4j Ai.til . h 'g LU Office of Inspection & Enforcement .

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U. S. Nuclear Regulatory Co= mission 7

Region II '

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' Atlanta, Georgia 30303 A.k ,

Attention: Mr. J. P. O'Reilly, Director

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/73, Instrument Process Tubing, Status Report No. 2 AECM-81/144 On December 30, 1980, Mississippi Power & Light Company notified Mr. J.

Rausch, of your office, of a Potentially Reportable Deficiency (PRD) at the G tnd Gulf Nuclear Station (GGNS) construction site. 'The deficiency concerns discrepant slopes in instrument process tubing.

This deficiency is currently under investigation. We expect to provide to you our final report and determination of reportability by August 12, 1981. Our findings and corrective actions, to date, are summarized in the attached status report.

Yours trulv, J. P. McGaughy, Jr.

WHU:mt Attachment cc: See page 2 O s

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i 81042003(,s S 1

i Member Middle South Utilities System

Mr. J. P. O'Reilly AECM-81/144 NRC Page 2 cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner .

Mr. Victor Stello, Director Office of Inc' on & Enforcement U. S. Nuclear' Regulatory Commission -

- Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401 f

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Attachment to AECM-81/144 Page 1 of 2 STATUS REPORT NO. 2 FOR PRD-80/73 I. Description of the Deficiency A random sample of instrument process tubing has disclosed a number of installations that do not meet the minimu:2 slope requirement of the appropriate specification. Several of the discrepant installations have been accepted by the Constructor's Field Engineering and Quality Control sections. This renders the quality of all installed safety related -

t.ubing indeterminate. All Unit 1 instrumentatica systeus could be affected. The potential exists for the deficiency, as noted, to produce an error in essential instrumentation in excess of design limits.

Potentially, inaccurate instrument readings / trips cculd adversely affect the safe operation of the plant.

II. Approach to Resolution of the Problem The process tubing installation specifications state that a support be established on a 1 inch per foot slope. If for any reason the support moves up, which could be caused by the drill wandering when drilling a hole, a nonconformance to the slope specification could tesult. Because the design and layout of the tubing installation is to the mini:num

, requirements of the specification, there is no latitude for problems encountered during the installation of the instrument process tubing.

Reinspection of the instrument process tubing i's currently in progress. The full extent of this deficiency cannot be determined until this inspection is~ complete. Our Architect / Engineer has revised the slope requirements and is coming to the jobsite to indoctrinate our constructor's Field Engineers and Quality Control Engineers on the -

interpretation of the new slope requirements.

III. Status of Proposed Resolution A reinspection of all safety related instrumentation installations is currently underway to determine acceptance under the new criteria, and all nonconformances will be documented. This reinspection is partially

' completed and areas of nonconformance have been identified and sent to our Architect / Engineer.

We anticipate completion of these inspections by April 30, 1981.

IV. Reason Why A Final , Report Will Be Delayed The complete reinspection is being accomplished using the schedule of system turnover dates to Mississippi Power & Light for establishing l inspection priorities. At the completion of the reinspection, our Architect / Engineer will require tim to evaluate and analyze the findings. ,

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Attachment to AECM-81/144 Page 2 of 2 l

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V. Date When Final Report Will Be Submitted

We expect to complete our evaluation and submit our fins. report on or before August 12, 1981.j 4

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