ML17059B018

Feedwater Nozzle Analysis.

ML17059B018
Person / Time
Site:	Nine Mile Point
Issue date:	01/20/1995
From:	Mortenson S, Self J GENERAL ELECTRIC CO.
To:
Shared Package
ML17059B019	List: ML17059B018 ML17059B020 ML17059B021 ML17059B022 ML18040A240
References
GENE-955-002-01, GENE-955-002-0195, GENE-955-2-1, GENE-955-2-195, NUDOCS 9512220192
Download: ML17059B018 (68)

Text

GENE-955402-0195 NINE MILE UNIT 1 FEEDWATER NOZZLE ANALYSIS January 20, 1995 S.C. Mortenson GENERAL ELECTRIC NUCLEAR ENERGY 12200 Herbert Wayne Court Ste100 Huntersville, NC 28078 Approved:

J.W. elf Manag r Inspe n Service 9512220192 951215 PDR ADQCK 05000220

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~o GENE-955-002-0195 IMPORTANT NOTICE REGARDING CONTENTS OF THIS DOCUMENT Please Read Carefully The only undertakings of the General Electric Company (GE) respecting information in this document are contained in the Purchase Order between Niagary Mohawk Power Corporation, and GE, titled "Contract between Niagara Mohawk Power Corporation and General Electric Company for 1995 Outage Services (RFO13)", effective February 18, 1994, as amended to the date of transmittal of this document, and nothing contained in this document shall be construed as changing the contract. The use of this information by anyone other than the Niagara Mohawk Power Corporation, or for any purpose other than that for which it is intended, is not authorized: and with respect to any unauthorized use, the GE makes no representation or warranty, and assumes no liability as to the completeness, accuracy, or usefulness of the information contained in this document, or that is use may not infringe privately owned rights.

GENE-955-002-0195 NINE MlLE 1 FEEDWATER NOZZLE ANALYSIS This document summarizes the evaluations performed by GE on the Nine Mile Unit 1 Feedwater nozzle. The evaluations were broken in two areas. The first was the GE Nozzle Modeling of Zones 1 thru 5 and the second was a manual assessment of the deepest grindout in the SW Feedwater nozzle.

FEEDWATER NOZZLE MODELING GE Nozzle Modeling analysis was performed on inside diameter (ID) surfaces of the Nine Mile 1 Feedwater nozzle identified as Zones 1 thru 5. The ID surface area of interest started at the intersection of the reactor pressure vessel (RPV)

ID surface-to-nozzle taper area of Zone 1 and extended into the nozzle bore to the Safe End region of Zone 5.

The ultrasonic parameters (beam and rotation angles) used in the modeling were optimized to obtain the best overall coverage with the least amount of scanning setups which, in the long run affects the scanning time and the radiation exposure recieved. With these parameters, the entire inside diameter (lD) surface will be examined with sound beam-to-flaw angles within the bounds determined on GE's feedwater nozzle mockup. The boundry limits for the GE Nozzle Modeling are documented in GE-NE-C3100016-02.

Not taken into account were any restrictions that would impair the UT examinations. GE's experience has been on nozzles with restrictions, supplemental manual methods together with the GERIS 2000 have been able to obtain 100% coverage (from at least one direction).

GRINDOUT ANALYSIS Modeling Due to the complex geometries produced by grindouts, manual methods were used to analyze the bottom ID surfaces of one of the deepest grindouts. The analysis process involved the following steps:

1. Constructing a 3d wireframe of the Nine Mile 1 feedwater nozzle.

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GENE-955-002-0195

2. Superimposing a surface contour (3d polyline) of the grindout bottom into the 3d wireframe. The polyline was constructed using the dimensions taken from a mold made from this grindout.

3. Three-Dimensional UT beam ray tracing was performed in eight positions along the length of the grindout. This data, represented as 3d lines was also inserted into the 3d wireframe. Four locations were plotted (Figure

1) with the scan from the nozzle OD blend radius (Z2A), four locations were plotted with the scans from the nozzle OD cylinerical surface (Figures 2 and 3).

4. The location at which the UT beam intersects the bottom of the grindout is then determined. At this location the angle of grindout surface is measured (NIDANG) and the axis of a postulated axial flaw is calculated.

,5. The alpha and beta angles of the sound beam to the flaw axis which determine the effectiveness of the UT beam are then calculated. The results are listed in Table 1 below.

ID SCAN NIDANG BETA ALPHA 12 32 60 17 31 50 Z2A 40 30 26 '0 19 19 53 Z3 10 35 Z3 20 24 43 Table 1. Nine Mile SW Feedwater Grindout Analysis All data is within the bounds determined from the GE Feedwater nozzle mockup, except one, the Beta angle for¹7 Zone 3. This data point was 35', which was one degree under the lower limit of 36'hich is determined from previously collected data on the GE nozzle mockup. This one degree value below what was determined on the GE mockup, should not effect the detectability of flaws in this region. A previous study performed by AEA for GE used a lower limit of 35'.

In addition, this region is within the acceptable limits of the Z2B scans.

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GENE-955-002-0195 Grindouts in the GE's Nozzle Mockup To further confirm the detection of flaws in the bottom of grindouts, mockup testing was performed. To demonstrate the detection of flaws in the bottom grindouts, electromagnetic discharge machine (EDM) notches were made in the bottom of two grindouts in a nozzle mockup. With the same design parameters as used on the Nine Mile 1 Feedwater nozzle, the areas were examined with the GERIS 2000 (Figures 4 and 5).

Examinations with the GERIS-2000 were performed pre and post EDM. As expected, during the review of the pre EDM examination data, low level signal amplitudes in the grindout areas were recorded. However, during the review of the post-EDM examination data, higher-than-previously recorded grindout signals were recorded. In general, these UT signals recorded were:

1. Higher in amplitude than the grindout signals (4x or 12 dB);

2. Accompanied by Tip-diffracted signals from the notch tip; and

3. Mode-converted UT signals from the notch were observed.

There was clearly as difference between the pre and post examination with the GERIS-2000 as to the presence or not of reflectors in the bottom of the GE nozzle grindouts.

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