ML20059L986
| ML20059L986 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Peach Bottom, Byron, Braidwood, Limerick, Quad Cities, Zion, LaSalle  |
| Issue date: | 11/11/1993 |
| From: | Rongione C FISCHER & PORTER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-93 NUDOCS 9311180054 | |
| Download: ML20059L986 (4) | |
Text
. _
FISCHER r
S w
PORTERLa 11 November 1993 Docurent Control Desk U.S. Nuclear Regulatory Comnission Washington, DC 20555 l
l This report is to provide information on a deviation that has been found i
in the testing of clamp-on ultrasonic flowmeters on 12" pipe. The test fluid I
was water and the pipe was schedule 40 Carbon Steel.
This report is a follow-up to an initial notification to the N.R.C. Operations i
Center.
While Fischer & Porter cannot perform the evaluation (10CFR Part 21.21 (b))
it is not believed that this is a Substantial Safety Hazard.
Our custarers that were affected have been notifir3 (Philadelphia Electric Company and Commonwealth B3ison Canpany) and they will perform the evaluation according to their own procedures.
Deviation: A fully open butterfly valve located 15 pipe diameters upstream of the sensors was disturbing the flow profile enough to cause the ultrasonic meter to indicate 3 to 4% low.
The deviation was noticed using a Controlotron Ph3el 990 single channel flowmeter with 1 set of sensors in the direct node.
Corrective Action: Thc valve has since been removed and any future testing will be conducted with the valve removed, t%quence of Events Dnployees of Philadelphia Electric noticed that the results on the 12" line did not secrn to be random but seemed to be always on the low side appIrximately 4 to 8% and asked F&P to perfonn some additional tests.
The diameter of the pipe was rechecked to see if that was the problem but it was found to be the same as previously measured.
To investigate if this was 6 flow profile effect, three calibrations were done with the sate sensors mounted at the same position on the pipe but the pipe was rotated between tests.
FISCHEA G PoATE A COf#%NY q r l'
125 E COUNTY UNE RD.
WAAMiNSTE R.FW U G.A. 18974-4995 (215) G74-Gooo TELEX.173127 FISHPOhT WSTA 9311180054 931111 e'
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The first test was with the sensors horizontal, the second test was with the pipe rotated counterclockwise 30 degrees and the third test was with the pipe rotated 30 degrees clockwise from horizontal.
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The results are outlined in the attached data but are surrmarized here.
Horizontal -6%,
30 deg ccw -10%, 30 deg cw -3%.
This seemed to indicate j
that the device was being affected by the flow profile.
The test (only one j
rotation) was also performed on a magnetic flowmeter and the magmeter showed -
no difference in calibration.
This is probably due to the fact that the ~
[
Ultrasonic meter reads a small section of the velccity profile but the 1
mag:Teter tends to average over the velocity profile.
^
A fully opened butterfly valve located 15 pipe diametels upstream of the sensors was suspected as the source of the profile disturbance.
Preparations were then made to rerreve the valve.
The sensors were mounted on the pipe in the horizontal position and a test run with the valve in the line.
The valve was then removed and test re-run.
The pipe was then rotated again l
30 deg cw and the test re-run with the valve removed.
The results are outlined in the attached data but are sumnarized here.
Horizontal with valve
-6%, horizontal without valve -1%, 30 deg cw without valve -l%.
i Sincerely, gl
'l l
.A v
Charles J. Rongione Sr. Flow Standards Engineer Fischer & Porter Company 125 E. County Line Road Warminster, PA 18974 CJR:bpl attactment
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4 Tests With Valve in Line i
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