ML19318B212
| ML19318B212 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 06/24/1980 |
| From: | Sylvia B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| 549, NUDOCS 8006250132 | |
| Download: ML19318B212 (43) | |
Text
ef ~ s VinorNIA ELucTute ANo l'ownu CoMi%NY H icunox u,va noia :A nou6:
June 24, 1980 Mr. liarold R. Denton, Director Serial No. 549 Of fice of Nucicar Reactor Regulation N0/FHT:sav Attention:
Mr. B. Joe Youngblood, Chief Docket No. 50-339 Licensing Branch No. 1 License No. NPF-7 Division of Licensing U. S. Nuclear Regulatory Co unission Washington, D. C.
20555
Dear Mr. Denton:
NORT11 ANNA POWER STATION UNIT NO. 2 LOW PRESSURE TURBINE DISC INSPECTION REPORT Picase find attached the Westinghouse Electric Corpora tion report of low pressure turbine disc ultrasonic inspections perforned on North Anna Unit 2.
This inspection was performed to address concerns about disc-to-shaft keyway cracking detected at other facilities, and to satisfy the North Anna Unit 2 j
Technical Specification requirement 8.4.
No:e that the recomendations of the report state that the rotors are suitable for satisfacto y operation until the next inspection.
Very truly yours, B. R. dylvia Manager - Nuclear Operations and Maintenance FHT/sav:SCl cc:
Mr. James P. O'Reilly, Director NRC Of fice of Inspection and Enforcenent Region II Atlanta, Georgia 30303 f
POOR QUAllTY PAGE 800625013g i
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VIRGINIA ELECTRIC POWER CO.
NORTH ANNA !2
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LOW PRESSURE DISC ULTRASONIC
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INSPECTION P.EPORT 4/7/B0 Is
LOW PRESSURE DISC ULTPASONIC INSPECTION REPORT INTRODUCTION This report covers the ultrasonic inspection of the Virginia Electric Power Co, North Anna #2 unit. This unit is of a shrunk on disc design with each disc keyed to the shaft at the disc bore area.
The disc keyways are located such that standard NDT techniques cannot be used.
The U.T. inspection was performed to detect possible cracking in the disc keyway area.
The need for this inspection is a result of recent industry experience where stress corrosion cracking has occurred in machines of shrunk on disc design. Cracking in this disc bore area, if allowed to propagate, could eventually lead to a disc burst.
DISCUSSION Ultrasonic inspection techniques have been developed for detecting keyway cracks without the need for unshrinking discs.
Two techniques are used; one for detecting crack indications and the other for verifying crack indications and measuring their depths.
The initial technique used is the tangential aim, where an ultrasonic transducer is mounted on a plexiglass block that sits on the disc hub.
The plexiglass block is contoured so that it is in complete contact with the disc hub.
The ultrasonic waves are directed tangentially towards the keyway so that any cracks above the keyway area will be perpendicular
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to the sound beam and reflect the sound. A careful analysis of the
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time difference between the echoes from the keyway and the crack allows discrimination of false indications.
This time dif ferential procedure is accomplished by circumferentially scanning (see Figure 1). Since the disc profile is composed of a series of ccapound radii a mathematical model was develcped for transducer positioning and alignment. The model was computerized to allow calculation of: (1) all needed information for positioning and aiming the transducer for detection anywhere on the disc bore, (2) metal path length, elapsed time to keyway echoes, and time between keyway echo and crack echo, (3) time between keyway echo and suspe::ed spuricus indications, (4) various angles with interrelated ultrasonic central ray direction to disc and transducer axis.
Also because of the disc profile and the need for good sonic coupling l
be: ween the dis: metal and the plexiglass blocks (called compound angle edges) a ':trp number of blocks are required (see Figure 2).
If a crack indication is picked up sonically, the location is determined
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by the transducer location and its relationship to kevhole echoes and indication echoes (see Figure 3 and 4).
Since the tangential aim technique is not suitable for determining depth of crack, a complementary technique called radial aim is used to: (1) verify
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cracking detected by the tangential aim technique, and (2) to estimate the depth of crack.
In this method, the ultrasonic waves are directed perpendicular to the keyway.
The radial aim methed works because a crack undergoes branching and spreading while it grows. Thus, the branching part of the crack includes components which reflects ultrasound back to the transducer.
Depth of the crack is estimated by measuring the time between the keyway echo and the flaw echo, and then coverting to round trip distance by multiplying by shear wave propagation velocity (126,000 in./sec).
ANALYSIS After ultrasonis inspection has indicated a possible disc crack, an analysis is made to deteraine what the indicated crack size is in relationship to the critical crack size as determined by fracture mechanics.
This relationship is used to determine Westinghouse recommendations regarding continued operation with a disc crack indication.
EQUIPMENT Electronic Instruments
(-
A)
Krautkrater USIP ll-Ultrasonic Equipment (for recomended test t
settings see Appendix A).
B) Tektren.x Mcdel 465B or Model 455 Portable Oscnloscope.
(Model 4553 is preferred).
(For recor: ended test settings see Appendix B).
Transducers Transducers rancing in diameter fron 1/4 inch to 1-1/8 inch and in frecuercy frc : 2-1/4 MHZ to 10 MHZ as detailed in the specific tables for eacn cf the 33 discs.
Other frequencies may be used to further evaluate indications.
Wedoes wmerous plexiglass wedges varying in entrance angle, rotational angle, radius of curvature, physical size and rotational direction are provided, as required for each of the BB discs, as detailed in the specific tables.
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Transducer Manipulators Transducer manipulators are used whenever hand scanning cannot be conducted.
A) Wedge Extensions B) Transducer Manipulators (ji R&D Drawing No.12222J20)
C) Charlotte Manipulator Camera Tektronix C-5A Oscilloscope Camera, or equivalent.
Couplant Ultragel II. Westinghouse M-54410LF.
Calibration Standards A) 3/4 inch x 8 inches long cylindrical rod.
B) Plexiglass Block
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Conversion Factors
^
Ultrasonic measurements of distance are presented as time interval measurecents en the 465B oscilloscc:e. Thus, time measurements in s/ division on the oscilloscope must be multiplied by 0.113 in/ sec for shear wave travel to convert them to linear measurements in inches.
INSPECTION RESULTS fiarth Anna - LP-1 and LP-2 No.1 LP -
No indications were reported on this rotor.
No.2 LP -
The discs on this rotor were free of indications with the following exception.
The No. 2 disc, Gov, end, displayed a tangential aim indication in the disc bore area at balance hole No. 9.
This indication could not be confirmed with the use of the radial aim technique, therefore, no depth could be estimated.
Based upon our experience to date in the verification process, it is reasonable to assume that the indication is below
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normal detectable depth.
RECOMMErlDATIONS The inspection of the discs included the keyways and a 360* scan of the outlet edge of the bore.
No reportable indications were found on any of the discs.
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Based on the above it is our engineering judgment that the rotors are l suitable for satisfactory operation until the next inspection.
The recommended inspection interval will be established aft'er the current series of disc inspections are completed and the results reviewed. We expect this review to be completed within the next six months.
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= Angle Of incidence of ultrasonic rays on radial through the keyhole y
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FIG. 4 - Transducer Position (1,b) and Align =ent Para =eters (S '#)
6 to Examine Keyway Targe
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ULTRASONIC INSPECTION OF LP TURBINE DISCS (KEYWAYS AND BORE HUB AhEAS)
DATE
~N recM No. ecro to4
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DISTRIBUTION:
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