ML20248C001
| ML20248C001 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 06/02/1989 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| ULNRC-2011, NUDOCS 8906090229 | |
| Download: ML20248C001 (8) | |
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- June ~2, 1989
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s U.S.; Nuclear Regulatory Commission ATTN:
Document Control Desk i
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Washington, DC 20555 Gentlemen:
ULNRC-2011 1
CALLAWAY PLANT DOCKET NUMBER 50-483 WIDE. RANGE GAS-MONITOR ISOKINETIC-SAMPLING 1Ref:
ULNRC-1839, dated October 4, 1988 The; reference letter requested alvariance from
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~ isokinetic sampling per ANSI N13.1-1969 guidelines for the normal. vent' flow /high radiation sample flow isokinetic nozzle.
In aftelephone conversation between the Staffiand U.E. personnel.on May 18, 1989 several
' issues were-discussed.
This 1'etter provides documentation P
..of the information~provided to the Staff in that
~ telephone call.
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The callaway Plant' unit: vent wide range gas monitor-
.(WRGM) uses'four sample lines with associated isokinetic nozzle assemblies for sample collection.
Figure _1 shows
- a. simplified configuration ~ diagram of the. isokinetic nozzle assemblies and' associated sampling equipment.
Two 7
Esample-lines ~are provided for collection of unit. vent samples'at low radiation activities.
These lines are fitted with isokinetic nozzle assemblies for collecting 1 samples at normal and accident unit vent flow rates. 'Two additional sample lines are provided for collection of unit vent samples at high radiation activities.
These b
- lines are also fitted with isokinetic nozzle assemblies
-for collecting samples at normal and. accident unit vent flow rates.
The design parameters for the isokinetic
- ,y nozzle assemblies are described in Attachment 1.
Automatic isokinetic sample flow control is performed by-the WRGM RM-80 microprocessor which imaintains sample flow at a constant ratio with the unit vent flow when the unit vent flow is within the isokinetic sample ranges listed in Attachment 1.
The WRGM RM-80 7
takes the unit vent flow provided by the unit vent flow pO0l 1.~
'8906090229'8906d2 C
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ULNRC-30ll, June 2, 1989 measurement system and multiplies it by the isokinetic control ratio to determine sample flow rate.
The WRGM RM-80 sets the sample flow by adjusting the sample flow control valve until the correct flow is registered on the sample flowmeter.
ANSI N13.1-1969 defines isokinetic as a condition which prevails when the velocity of the air entering a sampling probe is identical to the velocity of the airstream being sampled.
In the case of the Callaway Plant normal vent flow /high radiation sample flow isokinetic nozzle, the nozzle velocity is 34% of the unit vent velocity.
This condition is defined by ANSI N13.1-1969 zus anisokinetic.
The effect,f anisokinetic sampling is minimized since nozzle velocity is less than unit vent velocity.
Under-this condition, the sample collected will have a higher particulate concentration than the unit vent per ANSI N13.1-1969, Appendix C.
Therefore, the sample collected would be biased in
[
the conservative direction.
The nozzle I.D. sizes of 0.070 inches and 0.020 inches, discussed in paragraph 5 of the reference letter were calculated based on ANSI N13.1-1969 criteria, and the conditions existing in the normal vent flow /high radiation sample flow path.
Nozzles of this size are impractical because of susceptibility to plugging during normal operation.
Based on the information provided above and in the referenced letter, Union Electric believes that the nozzle is sized to create a practical nozzle ID for sampling particulate l
in our unit vent.
Any redesign of the nozzle to meet ANSI l
N13.1-1969 guidelines would produce an impractical " hypodermic needle" type nozzle which would be easily damaged or plugged causing this sample path to be less reliable.
If you have any questions regarding this response, please let me know.
Very truly
- ours, MhY p(7, Donald F. Schnell DS/plh _ _ _ _ _ _ _ _ _ _
ATTACHMENT 1
-ULNRC-2011 PAGE 1 OF 2 WIDE RANGE GAS MONITOR p.
ISOKINETIC NOEZLES
'~
DESIGN PARAMETERS' UNIT VENT VENT FLOW -(NORMAL)= 68000 SCFM VENT FLOW (ACCIDENT)= 9000 SCFM VENT INSIDE: DIMENSIONS = 105 in. X 66 in.
VENT VELOCITY (NORMAL)= 68 0
IN 12 IN./FT 12 IN./FT VENT VELOCITY (ACCIDENT)=
pf
= 3.12 FT/SEC 60 C.
12 IN./FT 12 IN./FT ISOKINETIC SAMPLE RANGE (NORMAL)- 46,900 CFM TO 78,100 CFM
~ ISOKINETIC SAMPLE RANGE (ACCIDENT)- 6,750 CFM TO 11,300 CFM NORMAL FLOW, LOW RADIATION MO.VITOR FLOW = 1.67 FT / MIN There are three nozzles per manifold and three nianifolds in vent.
NOZZLE DIMENSION = 0.152 IN. ID 2
ARgA OF NOZZLES = 9 X (0.152 IN.2/4) X7TX FT /14'4 IN
= 1.13 E-03 FT VELOCITY AT NOZZLE = 1.67
=24.63 FT/SEC
-3 ASSOCIATED SAMPLE LINE= 3/4" O.D. X 0.065 SS NORMAL FLOW, HIGH RADIATION 3
MONITOR FLOW = 0.06 FT / MIN There is one nozzle on one manifold NOZZLE DIMENSION = 0.152 IN. ID 2
AREA OF NOZZLE = 1 X (0.152 IN.2/4) X7CX FT /144 IN
= 1.26 E-04 FT VELOCITY-AT NOZZLE = 0.06 F f60SEC
=7.94 FT/SEC M
ASSOCIATED SAMPLE LINE= 3/8" O.D. X 0.065 SS
-_-__-_-_-_-__-___a
h ATTACHMENT'l ULNRC-2011~
PAGE 2 OF 2-WIDE RANGE GAS NONITOR ISOKINETIC NOZZLES DESIGN PARANETERS ACCIDENT FLOW, LOW RADIATION MONITOR FLOW = 1.67 FT / MIN There are six nozzles per manifold and three manifolds in vent.
NOZZLE DIMENSION = 0.322 IN. ID AREA OF NOZZLES = 18 X(0.322 IN. /4)X 7CXFP /144 IN
= 1.01 E-02 FT
.67 VELOCITY AT: NOZZLE =
=2.76 FT/SEC 0
-2 ASSOCIATED SAMPLE LINE= 3/4" O.D. X 0.065 SS ACCIDENT FLOW, HIGH RADIATION MONITOR FLOW = 0.06 FT / MIN There is one nozzle per manifold and three manifolds NOZZLE DIMENSION = 0.152 IN. ID AREA OF NOZZLES = 3 X(0.152 IN.2/4)X 7t XFT /144 IN
= 3.78 E-04 FT 2
2 2
VELOCITY AT NOZZLE = 0.06 F I
M f60SEC
=2.65 FT/SEC
_q ASSOCIATED SAMPLE LINE= 3/8" O.D. X 0.065 SS l
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STATE OF MISSOURI )
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Alan C. Passwater, of lawful age, being first duly sworn upon oath says that he is Manager, Licensing and Fuels (Nuclear) for Union Electric Company; that-he has read the foregoing document and knows the content thereof; that he has executed the same for and on
' behalf of said company with full power and authority to do so; and that the facts thciein ctated are true and correct to the best of his knowledge, information and belief.
U4 f5fZu4t By Alan C.
Passwater Manager, Licensing and Fuels Nuclear SUBSCRIBED and sworn to before me this [Al day of
,198f N
BARDARA J PFAFF NCI ARY PUBLIC, STATE OF MISSOURI MY COMMISSION EXPIRES APRIL 22, 1993 ST. LOUIS COUNTY,,
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Gerald Charnoff, Esq.
g Shaw, Pittman,'Potts'& Trowbridge
- 2300 N. Street, N.W.
' Washington,'D.C.
20037
.Dr. J. O. Cermak l
CFA,.Inc..
(Suite 110) 4 Professional Drive Gaithersburg, MD. 20879 i
1.
R. C. Knop l
Chief, Reactor Project Branch.1 l
U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Bruce Little-Callaway Resident Offire U.S. Nuclear Regulatory Commission 4
RRf1 i
'Steedman, Missouri 65077 d
Tom Alexion (2)'
Office of Nuclear. Reactor Regulation U.S. Nuclear Regulatory Commission l~ White Flint, North, Mail Stop 13E21 11555 Rockville Pike Rockville, MD 20852 Manager, Electric Department l
Missouri Public Service Commission i
P.O. Box 360 l
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Jefferson City, MO 65102
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