ML19220C916
| ML19220C916 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/11/1979 |
| From: | Buhl A NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | |
| Shared Package | |
| ML19220C917 | List: |
| References | |
| NUDOCS 7905160060 | |
| Download: ML19220C916 (1) | |
Text
7'
' h.(l 60-32.o h
Bu.hl I
[266/P/h5 w
W:
f.r.
Hvf I\\, H~?
Alternate Backup Level Indicator Using PZR RTD
~
v
,Y; g
'11' EVALUATION
- p
[E TEC/0RNL have looked at using PZR RTD as level indicator.
coefficient decreases by about a factor of 100 when water level drop
@h The film below RTD (surface temperature increases).
The sensor will heat up and can determine whether water or steam environme of a time constant.
Q5
.g tc = 200 sac ye f;'i Decision Time e @ t 50 seconds
&e M
Note:
requires increased current ^100 ma into a stable bridge kE c1 g
L'~
MEASUREMENTS __
M Gd TF.C (Robinson /Mott) did measurements last night in water at TEC l could readily detect water versus air. increasing the current aos.
By Mf ey Rosemont (RID manufacturer) ran tests last night and found at 400 the senser fails in 4 minutes, but the situation looks reasonabl milliamps, milliamps.
(signal to noise problems).TEC tried lab tests at 50 milliamps but were n e at 100 f
b is that the system will work. However, with better equipment, if their judgment V
{
CONTACTS f
Dr. James Robinson, TEC, 615-966-5856 p
Dr. J. E. Mott, TEC, 615-966-5856 g:
r O
e
)t t,,.,..
\\\\8 \\00 j.'y t.[
f h 79051606 @
9
-} n
\\
's
~.