AECM-80-263, Part 21 Rept Re Standby Diesel Generator - Instrument Tubing Failure.Flat Caused Leaks to Occur During Routine Pressure Testing.Util Working W/Contractor to Resolve Deficiency. Final Rept Will Be Filed by 810305

Part 21 Rept Re Standby Diesel Generator - Instrument Tubing Failure.Flat Caused Leaks to Occur During Routine Pressure Testing.Util Working W/Contractor to Resolve Deficiency. Final Rept Will Be Filed by 810305

ML20062J599
Person / Time
Site:	Grand Gulf
Issue date:	10/20/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-80-297-000 10CFR-050.55E, 10CFR-50.55E, AECM-80-263, NUDOCS 8010310517
Download: ML20062J599 (4)

Text

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' P. O . B O X 16 4 0. J A C K S O N . MIS SISSIPPI 3 9205 Helping Build Mississippi JWE1 P. A8cG AUG*W. A

.ur.r e man October 20, 1980 2 &~C &,2 Z.?l "

Office of Inspection & Enforcement U. S. Nuclear Regulatory Co==ission F.egion II __

101 Marietta Street, N.W. ~-

Suite 3100 -

Atlanta, Georgia 30303 --

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

Dear Mr. O'Reilly:

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SUBJECT:

Grand Culf Nuclear Station

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Units 1 and 2 Docket Nos. *SO-416/417 /

File 0260/15525/15526 PRD-80/59, Status Ecport, Standby Diesel Generator - Instru:sent Tubing Failure --

AECM-80/263 _,

On Septe=ber 19, 1980, Mississippi Power & Light Co=pany noti-fled Mr. M. Hunt of your office of a Potentially Reportabic Defi-ciency (PRD) at the Grand Gulf Nuclear Station (CGNS) construction site. The deficiency concerns instrument tubing failu.re on the Standby Diesel Generator.

Our investigation as to reportability of this tsatter under 10CFR50.55(e) and 10CFIL.I is continuing. Our status report is at-tached. We expect to file our final report on this tsatter on or before March 5, 1981.

Yours truly, p J. P. McCaughy, Jr.

WDH:mt .

Attachment ec: Mr. N. L. Sta=pley Mr. Victor Stello, Director.

Mr. R. B. McCchee Division of Inspection & Enforcement Mr. T. B. Conner U. S. Nuclear Regulatory Com:sission Washington, D.C. 20555 Mernber Middle South Utilities System

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STAT'.'S TIPDF.T TOR PR3-SO/28

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1. Descripticn . _ _

A flat on the outer diar.eter and running the entire length of two sections of 3/8" stainless steel instrument tubing apparently caused Icaks to occur during routine pressure testing on system P75, Standby Diesel Generator. The two sections of tubing, M1 and H2, were in panel IH22P400. In both cases, the leakage oc-curred where the piping was joined to the panel by a swedge" lock fi t t ing.

Subsequently, an inspection of all tubing used in panels 1E22P400 and lHP22P401 revea3ed one additional 4-foot section of piping in the 401 panel with a s1=ilar flat. This section, however, successfully passed the pressure test.

All of the purchased tubing (5400'fe d)'~v~ith the same heat code as the defective tubing has been'used at the GGNS construction

, site. This tubing size and material is qualified for use in i either Balance of Plant (30P) or safety syste=s. This deficiency applies to both Unit 1 and Unit 2. At this time, the spec,1fic locations of where this tubing has been used has not been. deter-mined.

II. P_r_cposed Resolution Mississippi Power 6 Light Company is working with the constructor to resolve this de.ficiency. The evaluation to determine repor-tability under 10CFR50.55(e) and 10CFR21 is in progress. After the extent of the deficienc'y has been determined, remedial action

.and action to preclude recurrence vill proceed. ~~

III. Status of Proposed Resolution The censtructor has requested engineering data from the tubine manufacturer, Sandvik, that vill be used in evaluating this 4- _ .

ficiency. Additionally, the following findings were obtained from a netallurgical analysis of the damag'ed tubing:

1. A metallographic examination (up to 200X)o 'f the tubing failed to reveal any cracks or other defects. . _ _

2. The flattened area was ceasured to be 0.0025" deep. Other scrapes on the outside surface were 0.0005" deep.

This preliminary analysis concluded that the flattened area was most likely caused by a defective die scraping on the tubing,, .

during manufacturing.

Finally, our investigation of the extent of this deficiency is continuing.

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IV. Rencon for Delas in Tine.1 hepor" The investigation to detemine reportability and corrective action is not cocplete. .

V. Final Report Date We expect to file our final report on this catter on er before March 5, 1981. .

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