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 .-

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

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

r Attachm2nt to AECM-80/285 Page 1 of 1 4

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

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III. Status of Proposed Resolution ,

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

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