ML19332F936
| ML19332F936 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 12/05/1989 |
| From: | Trevors G NEBRASKA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-0619, RTR-NUREG-619 CNSS897643, NUDOCS 8912190344 | |
| Download: ML19332F936 (3) | |
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COOPER NUCLEAR STATION 1
_ Nebraska Publlc Power District
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December 5, 1989
. U.S. Nuclear Regulatory Commission Document Control Desk
. Washington,-DC 20555
Subject:
Report of Cooper Nuclear Station Feedwater Nozzle Examinations per NUREG 0619.
Gentlemen:
In accordance with Section 4.4.3.1(2) of NUREG 0619, "BWR Feedwater' Nozzle and Control Rod ~ Drive Return Line Nozzle Cracking", the following report of visual
= examinations.of the feedwater spargers at Cooper Nuclear Station, conducted during the Spring 1989 Refueling Outage, is presented.
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(a) By the end of June, 1989, there have been four startup/ shutdown cycles at Cooper Nuclear Station since the last visual examinations of the.feedwater spargers in 1988.
There have been 126-startup/
_ shutdown cycles at Cooper Nuclear Station since the initial startup q
of=the plant in 1974.
(b) :In 1980, Cooper Nuclear Station removed the.feedwater nozzle cladding and installed double-piston-ring, triple-thermal-sleeve spargers.
Subsequent to this, baseline ultrasonic and liquid penetrant examinations were performed per Cooper Nuclear Station and General Electric procedures.
No cracks or recordable indications were identified during these examinations.
In 1982, the feedwater nozzles and spargers were examined by ultrasonic and-visual methods, respectively, per Cooper Nuclear Station and General Electric procedures.
No cracks or recordable indications were identified during these examinations.
In 1983 and 1984, the feedwater spargers were visually examined per Cooper Nuclear Station and General Electric procedures.
No cracks or recordable indications were identified during these examinations.
In 1986, the feedwater nozzles and sparge,rs were examined by P'
ultrasonic and visual methods, respectively, per Cooper Nuclear Station and General Electric procedures.
No cracks or recordable indications were identified during these examinations.
L In 1988, the feedwater spargers were visually examined per Cooper Nuclear Station and General Electric procedures.
No cracks or L
recordable indications were identified during these examinations.
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D:c:cb:r 5, 1989 Page 2 (c) There have been no changes to procedures or systems that would affect the feedwater temperature or flow.
(d) There were no recordable indications identified from ultrasonic and visual examinations of the feedwater nozzles and spargers, respec-tively. in the 1989 examinations.
(e) Cooper Nuclear Station does not utilize a leakage monitoring device.
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(f) There were no crack-like indications identified from ultrasonic t
examinations performed in 1989.
The following procedures were used for the ultrasonic examination of the three examination zones in each feedwater nozzle.
Zone Procedure Region l
l
- 1 G.E. #NIRZl-W812 Inner radius of nozzle-to-vessel junction.
- 2
.G.E.
- NIRZ2-W812 Nozzle inner radius-to-nozzle inner bore junction.
- 3 G.E. #NIRZ3-W812 Nozzle inner bore.
For zones 1 and 2, a manual pulse-echo ultrasonic technique was used..This examination method. utilizes an angle beam shear wave technique to-identify crack indications.
For Zone 3, a manual pulse-ecto ultrasonic technique was used to examine the inner bore region of the feedwater nozzles.
This examination method requires the use of circumferentially directed shear waves scanned in two opposite directions around the inner bore of the nozzle to identify crack indications.
Personnel performing the aforementioned ultrasonic examinations were certified to at least Level I and trained on a nozzle mock-up utilizing the techniques described herein.
Please contact E. M. Hace, Engineering Manager at Cooper Nuclear Station, if you should require additional information regarding this matter.
Sincerely,
. A. Trevors Division Manager of Nuclear Support cat: RAS:ss
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~Decemb:r 5,21989;-
'.:Page'3 cc: NRC Regional Office Region IV NRC Resident Inspector Cooper' Nuclear Station 3
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