ML19199A302
| ML19199A302 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/31/1979 |
| From: | IDAHO NATIONAL ENGINEERING & ENVIRONMENTAL LABORATORY |
| To: | |
| Shared Package | |
| ML19199A301 | List: |
| References | |
| NUDOCS 7904110086 | |
| Download: ML19199A302 (25) | |
Text
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W. D. LANNING l-a l.'
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1 PRELIMINARY TEST RESULTS l
SEMISCALE PRESSURZ2ER RELIEF VALVE VENTING FROH
,{l THREE HILE ISLAND TYPE C0tsDITI0ttS f
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~o eg March 31, 1979
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l A.
SUMRARY On March 30. 1979, NRC management personnel requested EGAG Idaho personnel to help evaluate altarnativa courses of action for securing i
the Three-Hile Island Plant (THI).
We conducted our evaluation. Among i
several recommendations, we proposed conducting a venting test of the primary relief valve (PRV) in Semiscale from present TH! conditions to check the accuracy of calculations we performed on the response of THI to such a venting condition.
We conducted the proposed test from 6:55 a.m. to 9:47 a.m. on Norch 31. 1979.
Two-hundred forty channels of data were recorded.
The tes t was successful.
We believe the test results,may be of use to NRC in evaluating the probable THI plant response if venting from present conditions la attempted.
The remainder of this report is divided into three sections.
Section b presents a comparison of THI and Semiscale significant parameters as best we know them.
Section C provides the sequence of experimental events and significant pehnomena correlated with the time at which they occurred.
Section D presents the calculated THI plant response during venting from the PRV from the initts1 conditions provided by NRC.
Section E presents our conclusions from pressurizar rellut valve tests in Semiscale.
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B.
COM,P,ARISON OF SEMISCALE AND THREE MILE ISLAND (THI)
$1GNIFICANT PARAHETERS
(,"
)
1.
VOLUME RATIOS y, s e B&W Semiscale SS/BW Pressurizer 0.374 0.454 1.21 Cold Leg (one side) versus broken loop 0.118 0.255 2.16 ilot i eg (one side) versus broken loop 0.122 0.144 1.18 Total Loo (both sides) 0.974 1.596 1.639 n
2.
ELEVATIONS (from [ Nozzle HL)
B&W Semiscain Top of upper 21enum 14 f t - 6 in.
13 ft 1/2 in.
Top of core e
ft - 0 in.
-5 ft - 0 in.
Surge line connection to HL 6 ft 1/2 in.
4 ft - 0 in.se -
Surge line vertical drop (not from nozzle ()
12 ft - 8 in.
11 ft - 0 in.
Piping vertical height { total)
(tnci dtng pump suction) 68 f t - 0 in.
51.3 ft (BL) 21.3 ft (IL)
[ Nozzle to top of tube (or pipe) 46 ft - 0 in.
41 ft BL) 11 ft ILJ Surge line below top of core 3 ft 1/2 in.
2 ft - 0 in.
3.3 fC8
3.
SIGNIFICANT DIFTEREF:CES B&W 5em_f scal e Cold Leg 2 cold legs / side 1 cold leg / side (1 side scaled for 3/4 flew)
Hot Leg 1 per side 1 per side Upper Plenum Vent Valves No Vent Valves Hot Leg / Cold Leg Elevation Differenca None 8-1/2 in. (Hot II1gher)
SG Elevations (difference)
None IL 9 11 ft - 0 in.
BL 9 41 ft - 0 in.
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