ML19343A662

Interim Deficiency Rept to PRD-80/63,originally Reported on 801015,re Ventilation Sys Vlk Air Extractor Structural Inadequacy.Vane Assembly Sagging Being Invesigated. Investigation to Be Completed & Rept Submitted by 810312

ML19343A662
Person / Time
Site:	Grand Gulf
Issue date:	11/14/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-80-285, NUDOCS 8011190523
Download: ML19343A662 (2)

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f. ? .fl' MISSISSIPPI POWER & LIGHT COMPANY

- Helping B uild Mississippi

" = " " " " P. O. B O X 164 0, J A C K S O N, MISSISSIPPI 39205 JAMES P. McGAUGHY, JR. _,

assisraur vica ms.oeur November 14, 1980  :

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Office of Inspection & Etforcement . .

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U. S. Nuclear Regulatory Co 1:sion .-

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E Region II N 101 Marietta Street, NW Suite 3100 T$ .I_

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Atlanta, Georgia 30303 A u> s 3

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w 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-80/63, Interim Report, VLK Air Extractors AECM-80/285 On October 15, 1980, Mississippi Power & Light notified Mr.

J. Rausch, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site.

The deficiency concerns the structural hadequacy of VLK Air Ex-tractors used in ventilation systems at ,GNS.

Our investigation into this condition is in progress. At-tached is our interim report. We expect to complete the investi-gation and submit a final report by March 12, 1981.

Yours truly fpy J . P . McGaughy , J r .

ATR:mt Attachment cc: Mr. N. L. Stampley Mr. Victor Stello, Directo Mr. R. B. McGehee Division of Inspection & Enforcement Mr. T. B. Conner U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Stl Member Middle South Utilities System 5

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Attachm2nt to AECM-80/285

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INTERIM REPORT TO PRD-80/63 I. Description of Deficiency i During installation and operation of supply registers in a non-

safety related system, the VLK Air Extractors proved to be structurally inadequate. Specifically, when the extractors

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are installed to direct air flow vertically downward to air registers in the bottom of the duct, the weight of the assembly bears on a single vane, causing it to bend, thus allowing the vanes to shut, thereby closing off the air flow to the register.

Similarly, in the horizontal application, the vane assemblies

have a tendency to sag, especially for vane assemblies which j are 18 inches or longer. Although the problem was identified j on a non-safety related system, the same type of air extractors are used in safety-related systems. The NRC Region II was noti-

. fled of'this problem on October 15, 1980.

II. Approach to Resolution of the Problem 1 The Architect / Engineer will investigate the cause of the problem j in concert with the vendor and determine the actions necessary

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to correct the problem and to preclude recurrence. Based on this d'e termination, any required modifications will be made to

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• the air extractors.

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III. Status of Proposed Resolution ,

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The vendor has been contacted and requested to perform an in-depth investigation of the condition and to provide the Archi-tect/ Engineer with the results of their investigation.

IV. Reason for Delaying Final Report The vendor investigation has not been completed.

V. Projected Completion Date

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A final report is expected to be submitted by March 12, 1981.

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