ML061840117
| ML061840117 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  (NPF-072, NPF-077) |
| Issue date: | 12/01/2005 |
| From: | Nirodh Shah NRC/RGN-III |
| To: | Mahesh Chawla Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2006-0115 | |
| Download: ML061840117 (5) | |
Text
MEMOt~I G.iiawVict - Lyvv uiuVVUUVVII tiy iU raye I From:
To:
Date:
Subject:
"NXS@NRC.GOV" <nxs@nrc.gov> *
"lmlc@nrc.gov" <mlc@nrc.gov>
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12/1/05 10:30AM CW blowdown sys req
The primary finclion of the Cire Wate" Blowdowni System is to provide fir Lake ur-novert-o prevent un1dlesirahle chemical buildup in Lake. The sccondaly function of the Circ Walcr lBlowdown System is to provide dilution for liquid rcleases.
The Circ Water Blowdown System (Attachment 7) is designed to return Cooling Lake walcr hack to tht IeKankkee River. Processed fluids from the Sewage Treatment System and tlhe Radwaste Treatlnent Systems discharge. directly to ihe Circ Water Blowdown system where dilultion occurs prior to release to Iho Kankakee River. The Wastewaer T'reatment Plant and the I )em incralizer Regenera t Waste. systems aalong with various si raincr/fill or back washew; are returned to the Cooling Lake, and thuns are indirectly returned to the lmnkakee River through the Bllowvdown line afier dilution-by the Cooling Lake.
The Circ Water Blowdown syslem begins at the Circ Water System supply to the condenser.
- rwo 24" carbon steel pipes lap off the Circ Water supply piping (one from each unit) and combine into a 36" common heiader. Motor operated isolation valves, l/2CW(l 18, are provided on each 24" line. The 6" Radwastc Treatment System dischargc pipe connects to the 36" lBlowdown header. Downstream of the Radwaste connection, the BIlowdown pipe is expanded to 48" prior to connection of the 3" Sewage Treatment Plant discharge pipe. The 48" diameter Blowdown pipe is reintorced concrete pipe (RCP) and runs along owner controlled property to the Blowdowi River Screen House. Eleven vacuum breaker assemblies are incorporated at the high points along the,48" diameter RCP to prevent pipe implosion. The 48" RCP is eventually split and reduced to two 24" di*scharge pipes at the Kankakee River. Each 24" discharge,1pipc was originally equipped with a motor operated spray valve, OCW1O I A/l3. The entire piping nelwork is approximately 29,000 ft long and is operated at about 12,000 gpm (-2.5 fl/s).
A typical vacuum breaker is shown on attachment 4. On system startup, the vacuum breaker exhausts air from the piping system until the float assembly rises with water level to close and sealt f1r system operation. Upon systeimi shutdown, the vacuum breaker is designed to open as water level decreases. The air release or 'pilot' valve provides two functions. The primary pilot valve flunction is to release en traincd air that accumulates at the high points. (during normal system operation, air that would increase head loss and reduce process flow if rot removed. T he pile! Valve aIlso facilitatcs earlier opening of the vacmuum breaker on sysiem shutdown1. On shuidowns, air pockets that develop at high points may be at positive pressure, tending to hold
[he vacuum breaker on it-, scat even though water level is below the float assembly. Howvewr, the Pilot valve will release the air ald allow fhc vacuum breaker to open as soon as level (dro;pS.
Each vacuum breaker is provided with a butterfly isolation valve to facilitate vacuum breaker nailnteliance.
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\\/16A.AJ HO0W4 TO SELECT RLOW CLOS ING AmIVACUUM VALVES STEP ONE:
CHECK PUMP CURVE FOR G.P.M. CAPACITY AT NO HEAD CONDITION.
PS TEP TWO:
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3ERIODS ELEASE Islallalions.
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ELEASE IE NO.
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As APCO AIR/VACUUM VALVE Stainless S.,el float rInd trim, synthetic, non-destructible seal Positlly will not b!ow Shut even at alaximurm dOs-charge velocities. Regular 125 lb. or 250 lb, Ilange moles with similar flange on Surge Check Unit.
APCO SURGE CHECK VALVE Bronze tnm and Str.less Steel spring tor ultimate in proleCtion.
APCO AIR RELEASE VALVE Will open while fine is in operation against p(ossures up to 3010 PSI to exhaust small pockets ot entrainod air.
.Stainless Steel Concave Float. (Higher pressure valves available.)
Simplicity of design - no delicale needle valves to fail or need adjustment Posilively will not blow ShUL REPLACE SHUT-OFF VALVE wins APCO BUTTERFLY VALVE Casts to excavate pipeline trenches can be greatly reduced by using APCO Butterfly Valves for isolation instead of gate valves. APCO butterfly Valves arc econamictl, reliable and much shorler, permitting a reduction in depth oa the trench.
SERIES T900 AIRjVACUUM VALVE &.
SURGE C~tpg iJALM(
VALVE MODEL MAX.
HEIGHT SIZE NO.
DIAM 125 LBI 250 LB 1904 11 25%
251 6-1906 13%
ý0%
30%
B" 1908 17u 34%
35%
10" 1910 20 383
,39N SERIES 1700 AIR/VACUUIOM VALVW, SUJRGI CHECK VALVE L AIR RELEASE VALVE MODEL WIDTH HEIGHT NO.
27T 28 17;or.
22%.
3 1%
32%:
1708 25%
34%
35%
17*10 27%
3 8.
39%
SERIES 1300 AIRIVACUUM VALUE.
SURIGE CHECX VALVE & OUTTERtFLY VALVE MODEL WIDTH HEIGHT NO.
- 28 1 4 20 SERIES 1200 AIRIVACUUM VALVt. SURGE CHECI VALVE AIRn RELEASE & BE5.I'it~ILY VALVE MODEL WIDTH HEIGHT NO.
20%
30%
1206 J22"Xq ý35%'
.j 1912 29 45% 1 45A 1712
- 32.
1 45% 15'4 1308 23%
1310 25%.
1312 2814 1314 31%
1316 33%
4 DA 14" 1914 29 469 4 6A 16" 1916 32 49%
49'.
45%1 55%
scoy 4 11%
545%
55%
601.
1208 25%;
12120
- 327,
ý12 12 3 2'A 1214 4 ]A 52%
42%
50%
52'A 1714 41% 1 45%1 45%
1716 45%
4n% I 4m%
--IZEs 3'* & SMAUER, SEE BLILLE71N 586 LARGER SIZES READILY AVAILABLE -
CONTACT FACTORY.
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LEGEND:
-p-EXISTING FENCE LINE/APPROXIMATE PROPERTY UNE EXISTING PERIMETER DITCH UWITS FEEDER DITCH SLOW OQWN UNE G2CO SURFACE RELASE FROM VESU
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EXISTING &'ONITORLG %NELL LOCATIoNi AND IDENTIFIER v
STAFF GAUGE LOCATION AND IDENTIFIER A-I VACUUM EREAKERLOCATIONAND IDENIFIER RW i)
TEMPORARY MONITORING WELL LOCATION ANO IDENTIFIER N
N figure 1 SITE PLAN AND WELL LOCATIONS BRAIDWOOD STATION BraceviI/e, I!170&s
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