ML20117N588

Investigation on Feedwater Reducer from Farley Unit 1, Ltr Rept for Jul 1984

ML20117N588
Person / Time
Site:	Farley
Issue date:	07/31/1984
From:	Czajkowski C BROOKHAVEN NATIONAL LABORATORY
To:	NRC
Shared Package
ML20117N501	List: ML20117N580 ML20117N588
References
NUDOCS 8505170587
Download: ML20117N588 (4)

Text

,,,a LETTER REPORT INVESTIGATION ON A FEEDWATER REDUCER FROM FARLEY UNIT 1 Carl J. Czajkowski Brookhaven National Laboratory Department of Nuclear Energy Upton, New York I1973 JULY 1984 i

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INTRODUCTION

-In February'1984, during an ultrasonic inspection on the welds between the feedwater piping reducers and the steam generator feedwater nozzles at Farley Unit'1, linear indication were detected in the reducer base material. Since similar indications had been reported earlier by the U. S. Nuclear Regulatory Commission (USNRC) in IE Bulletin 79-13; a feedwater reducer (#1B) was sent to Brookhaven National Laboratory (BNL) for confirmatory failure analysis. The analysis was to consist of scanning electron microscopy (SEM) of the fracture surfaces to evaluate the mode of fracture.

Evaluation Upon receipt at BNL, the reducer was uncrated and photographed (Figure 1.)

The reducer was also evaluated by BNL Health Physics personnel for contamina-tion and radiation dose rate.

After completion of the health physics evaluation, the reducer was machined approximately 8" back from the extrados end of the nozzle. This cut was made in order to facilitate the examination of the extrados end. This cut '

was made dry. Scrappings were also taken from the inside surface of the reducer at this time for the SEM evaluation.

Visual examination of the extrados end of the reducer revealed no linear indications so a dye penetrant examination was performed using spotcheck brand (all Formula B) penetrant Type SKL-HF/SKL-S, developed type SKD-NF and cleaner /

remover type SKC-NF. After two applications of the process with no indications revealed, it was concluded that the indications had probably been inadvertently removed during the reducer's removal from the nozzle.

The scrappings were evaluated by Energy Dispersive Spectroscopy (EDS) for chemical analysis. It can be seen on Figures 2 and 2A that the scrappings con-sisted of Fe, Ni, Cu, Zn, Sn with Si present on one scan.

Work was discontinued on the reducer at this point of the investigation.

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EDS* N0ZZLE SCRAPINGS

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I Figure 2a EDS scan of scrappings for Figure 2h Second EDS scan for chemical j const itu ent s . analysis of scrappings. I i

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