ML20065G649
| ML20065G649 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 09/30/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE, YANKEE ATOMIC ELECTRIC CO. |
| To: | Kerrigan J Office of Nuclear Reactor Regulation |
| References | |
| SBN-336, NUDOCS 8210040193 | |
| Download: ML20065G649 (14) | |
Text
.
5"N **
IPUBLIC SERVICE
% owic.:
Companyof New HW 1671 WorceWer Road Framingham. Massachosetts 01701 (617) - 872-8100 September 30, 1982 SBN-336 T.F. B 7.1.2 United States Nuclear Regulatory Commission Washtugton, D. C.
20555 Attention:
Ms. Janis B. Kerrigan, Acting Chief Licensing Branch No. 3 Division of Licensing Re f e re nce s :
(a) Construction Permit CPPR-135 and CPPR-136, Ibcke t Nos. 50-443 and 50-444 (b) USNRC Letter, dated July 27, 1982, " Request for Additional Information", F. J. Miraglia to W. C. Tallman
Subject:
Response to 240 Serie, RAIs; (Hydrologic and Geotechnical Engineering Branch)
Dear Ms. Kerrigan:
We have enclosed responses to the following 240 Series Requests for Aidttional Information (RAIs) which were forwarded in Reference (b):
240.38, 240.39, 240.41 The response to RAI 240.40 will be submitted in the near f uture.
A draf t copy of these responses was forwarded to the NRC Staf f reviewer (Ro be rt Jachowski) on August 24, 1982.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY
& Av(
J. DeVincentis Project Manager b O ALL:dd 8210040193 820930 DR ADOCK 05000443 PDR
240.38 (2.4.3)
In your response to Question 240.32 (Hydrologic Engineering Question 240.02) you stated that the PMF on Hampton Harbor watershed combined with the PMH will increase the stillwater level at the plant site less than 0.1 feet above that calculated for the SPF combined with the PMH. However, no detailed analysis has been provided to support this assertion. Provide detailed analysis supporting this contentien.
RESPONSE
The original design stillwater level analysis performed for the PSAR and FSAR routed a maximum PMH open coast stillwater level of
+18.5 feet MLW (includes an astronomical tide of +10.6 feet MLW) concurrent with a peak SPF discharge of 72,800 cubic feet per second into Hampton Harbor to the Seabrook site. The routing model described in FSAR Section 2.4.5.2 (b-5.) was used in this analysis with a computer incremental time step of 0.25 hours2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />. The maximum stillwater level calculated inside Hampton Harbor was
+19.0 feet MLW, and when including the additional affect of hurricane winds blowir.g across Hampton Harbor, the maximum stillwater level calculated for the Seabrook site was +19.7 feet MLW. When a computer incremental time step of 0.05 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> was used, the maximum stillwater levels calculated within Hampton Harbor and at the Seabrook site were +18.7 and +19.4 feet MLW, respectively. This analysis included a maximum open coast stillwater level of +18.7 feet MLW. Therefore, the stillwater levels used in the FSAR flooding analysis of Seabrook are conservative.
The PMF discharge was routed into Hampton Harbor concurrent with a maximum open coast stillwater level of +18.7 feet MLW. The PMF discharge hydrograph used in this analysis was that shown in Figure 2.4-9 of the FSAR with a peak discharge of 136,500 CFS.
When using a computer incremental time step of 0.05 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, a maximum stillwater level within Hampton Harbor of +18.75 feet MLW was calculated. When the PMF discharge hydrograph is replaced in the analysis with a discharge hydrograph having a peak discharge of 29,250 CFS (less than that for the SPF), a maximum stillwater level within Hampton Harbor of +18.70 feet MLW was calculated.
These values of +18.70 feet and +18.75 feet MLW are less than the maximum stillwater level within Hampton Harbor of +19.0 feet MLW used in the FSAR flood analysis and result in less than the
+19.7 feet MLW that was used at the Seabrook site in the FSAR analysis.
Sensitivity t.se have shown that discharge rates versus duration in the SPF n d e F tange are insignificant in raising Hampton i
Harbor ^et r le is during the PMH occurrence due to the area-hes.;tc n tauship of the harbor and harbor's rapid response to the PR.1 open const water levels flowing through the harbor entrance, and over the beach dune system at water levels above about 12 feet MLW.
Table 240.38-1 summarizes the four cases discussed above.
i
Attached are the computer printouts for the two above described flood routing cases. The first page is input data describing the geometry of Hampton Harbor, the beach front, and the harbor entrance. On the remaining pages, the second column is the flood discharge input, the third column is the open coast stillwater level input, the fourth and fifth columns are computational steps, the sixth column is the Hampton Harbor stillwater level output, the seventh column is the flow through the harbor entrance, and the eighth column is the flow across the beach berm.
J
Table 240.38-1 COMPARISON OF PMH FLOODING CASES Feak Hydrologic Model Peak Water Level, Ft. MLW*
Flow Rate Time Step Open Inside At the (CFS)
(HRS)
Coast Harbor Site 72,800 0.25 18.6 19.0 19.7 72,800 0.05 18.7 18.7 19.4 136,500 0.05 18.7 18.75 19.4 29,250 0.05 18.7 18.70 19.4
- MLW = MSL + 4.1 I
1
~
.-+..m,
~
WATER LEVELS Iti A B'AY DUE TO COMBINED FLOOD AND HURPICANE EVENTS EV R.
FRASAD BAv ELV DT L
N NO CH NO WEIR O.00
- 0. 3 2000.
0.021 1
1 ELV AREA STORAGE O.00 O
O.
0.00 689 0.
3.00 820.
98598060.
6.00 951.
214315200.
9.00 1271.
359500680.
12.00 2349.
596031480.
15.00 342e 973369980.
18.00 4503 1491450840.
21.00 5580.
2150274060.
-a. 0 750.0
- 0. 0 750.0 40 750.0
- 8. 0 1270.0 10.0 1200.0 12.0 1e41. 0 13.0 1424.0 14.0 1790.0 16.0 1648.0 18.0 2088. v 20.0 1947.0 22.0 2386.0 w.
c.r.
~u.,....-
-4.0
- 0. 0
- 0. 0
- 0. 0 J O O. 0
- 8. 0
- 0. 0 10.0
- 0. 0 12.0
- 0. 0 13.0 3500.0 14.0 3500.0 16.0 3500.0 18.0 3500.0 20.0 3500.0 22 0 3500.0
'PMN wW-4 NEW MAA FMF m DROGR APH OW(I)
TIM 8 FLD G SEA EL SEAI BAY EL BAYI GCtI)
+
3 0.05 13400
- 0. 99 0.95 0.04 0.04 13616.
O.
O. 10 13800.
1.08 1.04 0.18 0.26
- 12998.
O.
O.15 14200.
- 1. 18 1.13 0.33 0.40
[12920.
O.
O.20 14600.
1.27 1.22 0.48
- 0. 55 42769.
O.
I O.25 15000.
- 1. 36 1.31
- 0. 63 0.70 b2555.
O.
k O.30 15400.
- 1. 44 1.40 0.78 0.86
'12152.
O.
I O. 35 15800.
- 1. 51 1.47 0.93 1.01 11547.
O.
?
O.40 16200.
- 1. 59 1.55 1.08 1.16 10849.
O.
O.45 16600.
1.66 1 63 1.23 1.30 10042.
O.
- 0. 50 17000.
1.74 1.70 1.37 1.45 9109.
O.
0.55 17400 1.83 1.79 1.52 1.59 8208.
O.
O. eO 17800 1.92 1.89 1.66 1.73 7352.
O.
O. e5 18200.
2.02 1.97 1.80 1.86 e324.
O.
- 0. 70 18600 2.11 2.06 1.93 2.00 5093.
O.
- 0. 75 19000.
2.20 2.15 2.06 2.12 3503.
O.
0.80 19800.
2.29 2.25 2.18 2.25
-533.
O.
0.85 20e00 2.38 2.34 2.29 2.34
-1807.
O.
0.90 21400.
2.47 2.43 2.39 2.44
-3022 O.
0.95 22200 2.56 2.52 2.49 2.54
-3809.
O.
1.00 23000 2.65 2.61 2.59
- 2. e4
-4592.
O.
1.05 24400.
2.77 2 71 2.70 2.75
-4403 O.
1.10 25800.
2.90 2.84 2.80
- 2. 8e
-3760.
O.
1.15 27200.
3.02 2.96 2.93 2 99
-40e1.
O.
1.20 28600.
3.15 3.08 3.04 3.10
-3672.
O.
- 1. 25 30C00.
3.27 3.21 3.16 3 22
-2792.
O.
1.30 31400 3.39 3 33 3.29 3.35
-3413.
O 1.35 32800.
3.51 3.45 3.42 3.48
-4665 0
1.40 34200 3.64 3.58 3.55
- 3. o1
-5679.
O.
- 1. 45 35600.
3.76 3.70 3.68 3.75
-670e.
O.
1.50 37000.
3.88 3.82 3.82 3 88
-7791.
O.
- 1. 55 40000 4.02 3.95 3.95 4 02
-8433.
O.
1.60 43000 4.17 4.10 4.10 4 17
-911e O.
- 1. e5 46000 4.31 4.24 4.26 4.34
-10458 0.
1.70 49000.
- 4. 4e 4.38 4.42 4 51
-120e7.
O.
1.75 52000.
4.60 4 53 4.60 4.68
-13886 O.
1.80 59800.
4.74 4.67 4.78 4.87
-16218 0.
1.85 67600
- 4. 89 4.82 4.98
- 5. 09
-19401.
O.
1.90 75400.
5.03 4.96 5 21 5 32
-2320e O
1.95 83200 5.18 5.10 5.45
- 5. 57
-27387.
O.
2.00 91000.
5.32 5.25
- 5. 71 5 64
-31905 0.
2.05 93000.
5.48 5.40 5.98 e 12
~3e224.
G.
2.10 95000
- 5. 64 5.56 6.20
- e. 30
-37774 0.
2.15 97000 5.80 5.72 6.41
- c. 52
-40064.
O.
2.20 99000.
5.96 5.88 6.62 6.73
-42356.
O.
2.25 101000.
c.12 6.04 6.83 6.94
-44e42 O.
2.30 103200.
6.28 6.20 7.04 7.15 446902.
O.
2.35 105400.
6.44 6.36 7.25 7.36 i49157.
O.
2.40 107600.
6.61 6.53 7.46 7.56
-51433.
O.
2.45 109800.
6.77 6.69 7.67 7.77 J53724.
O.
2.50 112000.
6.93 6.85 7.88 7.98
-56028.
O.
2.55 116400.
7.11 7.02 8.09 8.19
-59229.
O.
2.60 120800.
7.28 7.19 8.30 8.41
-62527.
O.
2.65 125200.
7.46 7.37 8.52 8.63
-66095.
O.
2.70 129600.
- 7. 63 7.55 8.74 8.85
-69855.
O.
2.75 134000.
7.81 7.72 8.96 9.07
-73791.
O.
2.80 134500.
7.97 7.89 9.11 9.19
-73638.
O.
2.85 135000.
8.14 8.06 0.25
- c. 32
-74311.
O.
rue c-uit, c L.ss suas
-vm m n
2 iS l io000.
6 C'
6 36
- c. 53 9 59
-75953.
O.
3 CO 136500 8 c3 8.55 9.66 9.73
-76675 O.
3.05 134800 8 80
- 8. 72 9.80 9.87
-7708E 0.
3.10 133100 8 48 8.89 9.93 10.00
-770o4 0.
3.15 131400.
9.15 9.07 10.06 10.12
-76163.
G.
3.20 129700.
9.33 9.24 10.18 10.25
-751Q3.
O.
3.25 128000 9.50 9.41 10.31 10.37
-73984 0.
3.30 127000.
9 69 9.59 10.43 10.49
-72407.
G.
3.35 126000.
9.85 9.78 10.56 10.62
-7051'9.
O.
3540 125000 10.0c 9.97 10.68 10.75
-cB6151.
O.
3j45 124000.
10.25 10.le 10.81 10.88
-6665c.
O.
3i50 123000.
10.44 10.35 10.94 11.01
-64660.
O.
3?55 122800.
10.c4 10.54 11.08 11.14
-62457.
O.
3.c0 122600.
10.83 10.73 11.21 11.28
-60123.
O.
3.e5 122400 11.03 10.93 11.36 11.43
-57897.
O.
3.70 122200 11.22 11.13 11.50 11.58
-55753 0.
3.75 122000.
11.42 11.32 11.66 11.73
-53701 0.
3.80 121900 it c5 11.53 11.81 11.89
-50631.
O.
3.85 121800 11.88 11.76 11.97 12.06
-46610
-616.
3.90 121700.
12.10 11.99 12.09 12.15
-34539
-881.
3.95 121600.
12.33 12 22 12.21 12.28
-21109.
-595.
4.C0 121500.
12.56 12.45 12.36 12.43 11640.
282 4.05 120000.
12.81 12.69 12.55 12.64 18562 1053 4.10 118500 13.0c 12.94 12.75 12.85 27340.
2972.
4.15 117000.
13 31 13.19 12.96 13.07 32134.
5827.
4.20 115500 13.5e 13.44 13.18 13.29 35582.
9492.
4.25 114000.
13.81 13.69 13.41 13.53 37943.
13308.
4 30 112600.
14.03 13.92 13.65 13.77 37595.
15242.
4 35 111200.
14.25 14 14 13.89 14.00 359el.
15310 4.40 109800.
14.4c 14.35 14.12 14.23 3524c.
15e42.
4.45 108400.
14.e6 14.57 14.35 14.46 34c10 15842.
4.50 107000.
14.90 14.79 14.58 14.69 3425c.
16140 4.55 105200.
15.24 15.07 14.80 14.91 43973.
27e49.
4.60 103400.
15.58 15.41 15.04 15.16 5797c.
44729.
4.65 101600.
15.92 15.75 15.26 15.37 74180.
83307.
4.70 99800.
16.2c 16.09 15.53 15.cc 81287.
97872.
4.75 98000.
16 e0 16 43 15.82 15.97 87318 11042c.
4.80 96400.
16.84 16.72 l o. 13 lo. 28 Sc614 11eo04.
4.85 94800.
17.08 16.96 lo.44 16.60 80174 104?Z7 4.90 93200.
17.31 17.20 16.73 lo. 88 7c575.
96c 59.
4.95 91600.
17.55 17.43 17.01 17.15 7383t 905B2.
l 5.00 90000.
17.79 17.67 17.28 17.41 71991 86c53 5.05 88600.
17.91 17.85 17.54 17.67 c1511.
63501 5.10 87200.
18.03 17.97 17.76 17 87 4c280 36024 5.15 85800.
- 18. I t 18.10 17.94 18.02 39024 25451.
5.20 84400 18.28 18.22 18.07 18.14 40072.
27t71.
I 5.25 83000.
18.40 18.34 18.20 18 26 42103 29099 5.30 81900.
18.4e 18.43 18.32 18.39 31357 l e032.
- 5. 35 80600.
18.52 18.49 18.43 18.48 12958 2'25 5.40 79400.
18.58 18 55 18.51 18.55 6488.#
eBO 5.45 78200 18.64 18.61 18.58 18 62
-11137.*
-1994.
5.50 77000.
18.70 18.67 18.63 18.66 15779..
3485.
5.55 75600.
18.68 18.69 18.71
_18.75
-39062J
-24270.
5.60 74200.
18.66 18.67 18.72 18.73
-37500
-22411.
5.65 72800.
18.64 18.65 18.73 18.74
-47005.
-35177.
5.70 71400.
18.62 18.63 LB 73.
18.72
-47592.
-36110.
i 5.75 70000.
18.60 18.61 T8.72 18.71
-49723.
-39451.
5.80 69000.
18.50 18.55 18.70 18.69
-58940.
-55511.
5.85 68000.
18.40 18.45 18.66 18.64
-68466.
-75185.
5.90 67000.
18.30 18.35 18.60 18.57
-72239.
-84180.
- 5. 95 66000.
18.20 18.25 18.53 18.49
-74959
-91186.
6.00 65000.
18.10 18.15 18.45 18.40
-7c205.
-95085.
QpQ_piritB{&
w
~
~
o tv e2cis "i7. 74 A7.83 18.25 18.20
-89498.
-1328c9.
6.15 61100.
17.So 17.e5 18.12 18.05
-92418.
-143152.
6.20 60200 17 36 17.47 17.97 17.90
-93627.
-147246.
6.25 59000 17.20 17.29 17 78 17.69
-89138.
-132903.
6.30 57500 16.98 17.09 17.61 17.53
-92302.
-140182.
6.35 56000.
le. 76 16.87 17.43 17.34
-94216.
-137527.
6.40 54500.
16 54 16.65 17.25 17.16
-96448.
-135282.
6.45 53000.
16.32 16.43 17.06 16.97
-98S68.
-132608.
6.50 51500.
16.10 16.21 16.88 16.78
-99975.
-129708.
6.55 50400.
15.86 15.98 16.69 16.60
-102)50.
-127406.
l6.60 49300.
15.62 15.74 16.51 16.41
-1049.13.
-125393.
t6.65 48200.
15.38 15.50 16.32 16.22
-107014.
-122827.
f6.70 47100.
15.14 15.26 16.13 16.03
-108948.
-119914.
?6.75 46000.
14.90 15.02 15.94 15.84
-110183.
-115938.
6.60 45000.
14.68 14.79 15.75 15.66
-110648.
-110838.
6.85 44000.
14.46 14 57 15.57 15.47
-110680
-105579.
6.90 43000.
14.24 14.35 15.39 15.30
-110915.
-100526.
6.95 42000.
14.02 14.13 15.21 15.12
-111261.
-95586.
7.00 41000.
13.80 13.91 15.04 14.95
-111693.
-90731.
7.05 40000.
13.58 13.69 14.82 14.71
-107460.
-81243.
7.10 39000.
13.36 13.47 14.61 14.50
-105077.
-73566.
7.15 38000.
13.14 13.25 14.41 14.31
-103789.
-6e953.
7.20 37000.
12.92 13.03 14.22 14.13
-102942.
-60679.
7.25 36000.
12.70 12.81 14.04 13.95
-102979.
-54482.
7.30 354c0 12.50 12.60 13.87 13.78
-104033.
-48424.
7.35 34920 12.30 12.40 13 70 13.61
-104880.
-42455.
7.40 34380.
12.10 12.20 13.54 13.46
-106013.
-36730.
7.45 33840.
11.90 12.00 13.38 13.30
-107356.
-311c5.
7.50 33300-11.70 11.80 13.23 13.16
-108880.
-25724.
'7.55 32640.
11.50 11.60 13.09 13.01
-110552.
-20259.
- 7. oO 31980.
11.30 11.40 12.95 12.88
-111770.
-17333.
7.65 31320 11.10 11.20 12.81 12.74
-112819.
-14671.
7.70 30660.
10.90 11.00 12.67 12.60
-113831.
-12011.
7.75 30000.
10.70 10.80 12.53 12.47
-114813.
-9342.
7.80 29600.
10.50 10.60 12.40 12.33
-115773.
-6659.
7.85 29200.
10.30 10.40 12.27 12.20
-116724.
-4014.
7.90 28800.
10.10 10.20 12.14 12.07
-117662.
-1404.
7.95 28400.
9.90 10.00 12.01 11.94
-118678 O.
8.00 28000.
9.70 9.80 11.80 11.70
-115444.
O.
8.05 27600 9.52 9.61 11.60 11.50
-113513.
0 8.10 27200.
9.34 9.43 11.41 11.31
-111446 O.
8.15 26800.
9.16 9.25 11.22 11.12
-109544 0.
8.20 26400.
- 8. 98 9.07 11.03 10.93
-107777.
0 8.25 26000.
8.80 8.89 10.84 10.75
-106131.
0 9.30 25600.
8 62 8.71 10.66 10.57
-104593.
O.
8.35 25200.
8.44 8 53 10.48 10.39
-103152 0
8.40 24800.
8.26 8.35 10.30 10.21
-101798.
G.
8.45 24400.
8.08 8.17 10.12 10.04
-100522.
O.
- 8. 50 24000.
7.90 7.99 9.95
- 9. 8e
-98413.
0
c.w,zlid WATER LEVELS IN A BAY DUE TO COMBINED FLOOD AND HURRICA.NE EVENTS i
Ei R.
FJM l
@AV ELV DT L
N NC CH NO WEIR O 00
- 0. 3 2800.
0.021 1
1 ELV AREA STORAGE O.00 O.
O.
0.00 689.
O.
3.00 820.
98598060.
6.00 951.
214315200.
9.00 1271.
359500680, 12.00 2349.
596031480.
15.00 3426.
973369980.
18.00 4503.
1491450840.
21.00 5580.
2150274060.
1 I
4
-a O 750.O O. O 750.O
- 4. O 750.O
- 8. O 1270.O
- 10. O 1201 0 12.O 1641.O 12 0 1424.0 14 0 1790.0 le. O 1648.0 18.0 2088.0 20.0 1947 0 22.0 2386.0 a..
,.v ve
-; O O. O *" *^ '
- 0'.- O O. O
- a. O O. O EO O. O
- 10. O
.' O 12.O O. O 11 0 3500.0 14.0 35CO.C l e. O 3500 0
- 18. 0 3500.0 20.0 3500 0 22.0 3500.0 l
1
.d r-
- re m RE TE,{GF PFCGiiAM GA$A0u iEPoo; TIME FLD G SEA EL EEAI BAY EL BAYI GCtI)
+
GW(I) 0.05 440.
- 0. 99 0.95 0.00 0.00 13876.
O.
O. 10 480 1.08 1.04 0.08 0.12 44111.
O.
O.15 520.
1.18 1.13 0.16 0.20 (4630.
O.
0.20 Sc0.
- 1. 27 1.22 0.24 0.28 45128.
O.
0.25 600.
- 1. 36 1.31 0.33 0.37 y5611.
O.
I
- 0. 30 720 1.44 1.40 0.42 0.46 15968.
O.
- 0. 35 840.
- 1. 51 1.47 0.51 0.55 16196.
O.
I 0.40 9e0 1.59 1.55 0.60 0.65 16405.
O.
0.45 1080.
- 1. c6 1.63 0.70 0.74 16592.
O.
O. 50 1200.
1.74 1.70 0.79 0.84 16755.
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t 240.39 (2.4.5)
Provide an evaluation of the effect on the wave overtopping rate resulting from the increased Design Stillwater Level using the combined PMF/PMH rather than SPF/PMH event.
RESPONSE
Since the design stillwater level when using the PMF/PMH event does not exceed the FSAR value of +19.7 feet MLW (+15.6 feet MSL),
wave overtopping rates provided in the FSAR are still the upper design values. These values, however, have been increased by 70 percent to account for wind affects.
When using the Regulatory Guide 1.59 maximum open coast stillwater level of +17.8 feet MLW, the maximum stillwater level at the Seabrook site is +18.9 feet MLW (+14.8 feet MSL). With this lower design stillwater level than that used in the FSAR, there is less wave overtopping.
I i
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240.41 (2.4.2, 2.4.5)
It is not apparent from our review of the ponding level on plant grade that concurrent intense precip.tation was included in your wave overtopping runoff /ponding analysis. Ther4 tore, provide a detailed analysis on the routing of the combined precipitation runoff from Probable Maximum Precipitation and wave overtopping runoff from the PMF/PMH event.
a)
If credit is taken for flow through the storm drainage system, provide justification that the storm drainage system cannot bec6ae blocked during this event.
b)
Identify the maximum water surface levels by location and elevation from the vertical seawall to the overflow weir (seawall).
c)
Identify plant access openings and sill elevations that may be affected by the runoff on plant grade.
RESPONSE
a)
Credit is not taken for flow through the Storm Drainage System for the PMF/PMH event. However, during a PMF/FMH event, significant blockage of the system is considered an unlikely event and, therefore, discharge through the Storm Drainage System would reduce the maximum standing water elevation on the plant site to less than the 20.6 feet MSL presented in the FSAR.
b)
Response to be supplied later.
c)
The following is a list of safety-related buildings where ponding water resulting from the PMF/PMH is critical, or approaches being critical to entering the building.
Elevations listed represent the sill of the access opening.
Building Sill Elevation (Ft.)
1.
Fuel Storage Building 20.5 (a) 2.
Main Steam and Feed Water Pipe Chase-East & West 21.0 3.
Service Water Pump House 21.0 4.
R.H.R. and Containment Spray Equipment Vault 20.67 (b)
(a) New and spent fuel are locally protected from rising water with a concrete barrier. The barrier heights are 25.5 and 25.0 feet, respectively.
i (b) The high point of the sloping floor beyond the sill restricts rising water from penetrating the building.
The high point is at El. 21.0 feet.
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