ML20215M204
| ML20215M204 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/23/1987 |
| From: | Standerfer F GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| RTR-NUREG-0683, RTR-NUREG-683 4410-87-L-0093, 4410-87-L-93, NUDOCS 8706260310 | |
| Download: ML20215M204 (5) | |
Text
.
4 ENuclear Cstesi Ter""
Route 441 South l
Middletown, Pennsylvania 17057-0191
'f 717 944 7621
)
TELEX 84 2386 1
Writer's Direct Dial Nurnber:
j (717) 948-8461
)
4410-87-L-0093 Document ID 0194P 4
i June 23, 1987 1
!e j
US Nuclear Regulatoly Commission Attn: Document Control Desk Washington, DC 20555
Dear Sirs:
Three Mile Island Nuclear Station, Unit 2 (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 Post-Defueling Monitored Storage Environmental Evaluation NRC TMICPD letter NRC/TMI-87-039 dated May 8, 1987, provided four (4) comments on the GPU Nuclear Environmental Evaluation for TMI-2 Post-Defueling Monitored 1
St orage (PDMS).
This evaluation was' submitted to the NRC via GPU Nuclear letter 4410-87-L-0025 dated March 11, 1987.
The attached responds to NRC Comments 2, 3, and 4.
The GPU Nuclear response to NRC Comment 1, concerning the bases for the transuranic source term (i.e.,
2x10-8 Ci/yr), is currently being prepared and will be submitted separately.
Sincerely, h
. R. Standerfer Director, TMI-2 FRS/RDW/eml Attachments cc: Regional Administrator, Region 1 - W. T. Russell Director, TMI-2 Cleanup Project Directorate - Dr.-W. D. Travers gDR706260320 870623
- p ADDCK 05000320 GPU Nuclear Corpor t on is a subsidiary of the General Public Utilities Corporation i,
ATTACHMENT 1 4410-87-L-0094 NRC COMMENT 1 Provide the bases for the transuranic source term (2x10-8 Ci/yr) given in Table 3.
GPU NUCLEAR RESPONSE GPU Nuclear is currently preparing a response to be submitted separately.
I NRC C0tNENT 2 Specify where inleakage from rain and groundwater will collect during
" post-defueling monitored storage."
GPU NUCLEAR RESPONSE Water inleakage currently occurs in the following areas of the plant and is collected as indicated:
o Fire Service Penetration; east wall of Turbine Building at the-300' elevation. Drainage is to the Turbine Building Sump, Water Treatment Sump, or the Condensate Regeneration Polisher Sump.
o Building Joint; between the Service Building and Air Intake Tunnel. This area 1
does not have sump drainage.
It is pumped periodically, as necessary, to remove inleakage.
o Construction Joint; basement of the Auxiliary Building (Aux. Bldg.).
Drainage
{
is to the Aux. Bldg. Sump.
'l o
Electrical Penetration; southwest corner of the Control Building area at the j
281' elevation. Drainage is to the Control Building Area Sump.
Depending on the magnitude of the inleakage and the location of drains, water will initially collect in the respective areas and eventually collects in the respective sumps, except as noted.
During the recovery period, GPU Nuclear will make the above areas as water tight as as reasonably achievable.
If the inleakage persists, or if inleakage should occur in other areas, it will be monitored during PDMS and disposed through the sump drainage and collection system.
NRC COMMENT 3 Specify the groundwater elevation at the TMI Site and provide the basis for this value.
GPU NUCLEAR RESPONSE Groundwater elevations are routinely measured (i.e., currently monthly) via 19 on-site monitoring stations.
The level is measured using an electric sounder in accordance with TMI' Procedures 9420-IMP-4512.02 and 9420-IMP-4522.10. The-sounder
ATTACHMENT 1 4410-87-L-0094' provides a depth in feet below the fixed datum point on the well.
The elevation of the datum point minus the measured depth is used for the groundwater elevation.
Groundwater elevations are measured monthly in stations MS1 to MS8, OS9, OS10, l
OS138, OS14, OS15, OS16, OS17, and. NS1 to NS4..More detail on the TMI groundwater monitoring program is available in the GPU Nuclear Annual Radiological Environmental Monitoring Report submitted via GPU Nuclear letter, 3211-87-2090/
4410-87-L-0071 dated April 30, 1987.
The mean groundwater elevation for these stations for 1986, a total of 218 readings, was 283.1 ft. Mean Sea Level (MSL). Station OS 15, which is'usually dry, had the low reading of 275.5 ft. MSL.
Station OS 16 appears to have a unique 1
ground-water condition, since the level in OS16 is normally about seven feet higher than the other stations (i.e., a 1986 range-of 290.7 ft.'to 293.2 ft. MSL).
The remainder of the stations were consistent in 1986 with 204 readings in the range of 277.6 ft. to 286.75 ft. MSL. A running table of groundwater elevations for 1986 (not including 0S15) is provided in Attachment 2.
NRC COMMENT 4 i
It appears that the TMI Site is within the 500 year flood plain. Please estimate 1
the impact of a 500 year flood (with failure of the dike) so that the staff can j
determine if the proposed " post-defueling monitored storage" is a " critical action" under the " Flood Plain Management Guidelines for Implementing Executive Order j
11988" (43 FR 6030) 10 Feb 1973.
Include the minimum elevatica of door dams if they will be in place and the minimum elevation of door sills if dams.are not' planned.
GPU NUCLEAR RESPONSE Based on U.S. Army Corps. of Engineers data, a 500 year flood will result in a flow rate of 1,500,000 cubic feet per second (cfs) at TMI.
This will result in a corresponding maximum river elevation of 308' at the head of the island. The 1972 flood (i.e., Agnes) developed a flow rate 1,020,000 cfs and a corresponding maximum river elevation of 303' ac the head of the island.
During this flood, a maximum river elevation of 300.5' was recorded at the THI-1 River Water Pump House.
Therefore, the maximum river elevation associated with the 500 year flood rate of 1,500,000 cfs would be expected to be 305.5' at this location. The THI-1 River l
Water Pump House is situated just north (upstream) of.the-TMI-2 site boundary.
The TMI-2 flood procedure requires that flood door panels be installed when' the river elevation reaches 302' (3' below the minimum door sill elevation for exterior doors). The requirements of this procedure will remain in effect,during PDMS.
Installation of these flood door panels will maintain.the seismic buildings watertight during any flood condition.
The flood panel covers the entire opening of the flood door; thus, there is no applicable "minmum elevation."
Per your request, the following information is provided regarding TMI-2 flood doors.
/
ATTACHMENT 1 4410-87-L-0094 Minimum Security Elevation Building Door No.
Door No.
of Door Sills Control Building CS-202 N/A 305'-6" CS-209 11 305'-6" CS-205 18 307'-4" Auxiliary Building A-229 10 305'-0" Diesel Generator Building DG-110 23 305'-0" DG-ll2 22 305'-0" DG-100 21 308'-0" Reactor Building R-201 20 305'-6" R-200 N/A 305'-0"
- Turbine Building-T 105 281'
- Turbine Building T 104 281'
- Turbine Building T 103 281' These doors are located in the wall separating the Turbine Building from the Control Building Area. If the Turbine Building were flooded, these doors are designed to prevent the flood from comnating to other seismic design areas of the plant. A flood in the Turbine Building would most likely be contained within the basement of this facility and, therefore, would not adversely impact previous flood evaluations.
l
w m
ATTACHMENT 2 4410 87-L-0093 TIREE MILE !! LAG-DIVIRONMENTAL CONTROLS TMI-GR0VOWATERLEVELREPORT 1
1984RUNNINGTABLE-DEPTHINFTAB0VESEALEVEL i
1 ITATION JAN FEB NAR
- R MAY JUN JUL AUG JEP GCT NOV KC
.g g.
- l El 1282.791284.521284.891283.861283.991283.991282.391283.251282.271282.651283.321284 l_
l i
l _ l _
l__
l g.. - l i.
-- l
.-l ln!2 l 283.56 1285.51 1 35.64 1284.73 1284.27 1282.85 1282.39 1283.22 1282 A9 1280.70 128 j
__.g.._.. l l... _ l
_.g.__ _ l p
.g.___
g
. _ g _ __g - g
_l 1n!3 1 283.52 1284.07 1284.37 1282.06 1282.99 1282.69 1281.89 1281.76 1281.59 1280.79 1291.
l
..g i.
i.__i
-l l-p.__.p.
p.
g l
-- - g _-[
In!4 l 283.41 1285.41 1284.85 l284.481283.481281.951281.681282.351281.201280.081280.881283 p__
p.
..l_.
l
-l_
l 1-
. p
_l-l p.
p.
-.p.
I i
l M5. I 283.381283.61 1285.62 l283.881283.421282.531282.61 1282.41 1281.581280.71 1291.52128 l
- l _
p___ p_____ l
.l_
l-p.
- p. -
l ___ p__ g - g i M6 l283.431283.841283.701283.971283.671282.331281.721282.11_l281.391280.481280.851283.45; i
l p
p.
p___p
--i p
._p p.--
l-l
.l_
_l l
lMI7 l 283.67 1283.74 1285.34 1284.22 1284.64 1282.44 1281.06 1283.22 1281.59 1200.49 1280.82 12 p.
p.__
p..___ p.
l g
_l
_l p.
p.
-l
.- p
-l 1Mr8 1 284.11 1284.30 1285.11 1284.18 1283.88 1282.65 1281.98 1283.08 1281.71-1280.52 1280.82 128 l
l g
-p.-p
_.p__g p
i
..p._
l p.
_ l
--l
)
l El l282.5912163.791282.161281.281281.05l200.29l279.451280.971278.311279.801279.151282.72l j
p_.. p
_. p.-
p_
p.
.p __ p.. p._ _ p__ _.p
._ p _ p
__l-l lN!2 l 282.44 1284.32 1282.98 1281.32 1281.12 1290.32 1279.75 1286.75 12?8.68 1284.14 1279.69 1283.6 p.._ l -
p _ p__ p l-g
.p
.p.
l p
g 1
lN!3 1283.21 1283.971281.821280.951280.65 l200.631279.301281.071278.16_l279.451279.151282.69 l p. p _.l
.p
_l
.l
.p l _. p
. p p _ p
.l l
l M4 l 281.87 1279.68 1280.65 1279.85 1279.64 M 8.71 1278.51 l280.02 1277.62 1278.77 1278.50 1281.70 1 p.
l_.
p.
p.
p p.. _.g_
p. l
. p.. _ ;._____.g I O!!0 1283.81 1284.341285.651284.541284.341713.631282.541283.241232.171280.951280.991284.22 l 1
p_..
p.
p.
p___
p p.-
l.
p_
p_..p_.
p p
- p. -
g l 0!!381283.231284.231284.871283.731283.561212.331281.561282.831201.331280.171280.51 1283.51 l
. p.. p p
p
.g. __ p
. p
_.p..
_ p p
__l l
p..
. p.
l 0!I4 l 283.74 1284.56 1285.13 1284.99 l283.94 1282.63 1281.87 1283.29 1281.69 1280.44 1280.81 1283.84 1-p.._ p _. p_
p...
p.._ p.
p_
p.
_l _
__ p _ __.p.
_.p.._ p.._..g.
I O!!6 l 296.70 1291.79 1292.92 1292.21 1291.96 1291.54 1291.59 1292.82 1291.48 1291.29 1291.84 1293 ?!
p___ p....
p....__ p.___. p..._. l _
p_
. p..__ p l _
p _ l _
..l l Oft? l 284.37 1285.66 1286.01 1285.86 1284.95 1284.39 1284.36 1284.72 1284.31 1284.44 1284.22 1283.61 p
p..____.p____.p.. _ p_. p.
g p..._.p..
p
.p.
p_____. p _. g iO!9 l 283.32 1284.60 1285.32 1284.63 1283.94 1282.98 1282.?? 1284.29 1283.13 1284.70 1282.85 1285.07<
p.
.. p..
.p
....p _ p p.._l
- p..
p___.. p p._____p.
p
__.g NOTE: GROUS WATER LEVELI K A!URED FROM TOP OF WELL-
.i 4
. -.