ML20084B191
| ML20084B191 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 07/31/1972 |
| From: | Brian Lee COMMONWEALTH EDISON CO. |
| To: | James O'Reilly US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084B161 | List: |
| References | |
| NUDOCS 8304060170 | |
| Download: ML20084B191 (8) | |
Text
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. d Commonwealth Edison Company ONE FIRST NATIONAL PLAZA
- C H I C A G O.
ILLINOIS a u,.....a, POST OFFICE BOX 767
- C H l C A G O.
I L L I N O 15 60490 o) a
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July 31, 1972
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Mr. John F. O' Leary, Director I'
Directorate of Licensing
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N U.S. Atomic Energy Commission
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Washington, D.C. 20545
Subject:
Final Report on. Condenser Pump Room Modifications for Quad-Cities Units 1 and 2 - AEC Dkts 50-254 and 50-265
Dear Mr. O' Leary:
Attached is the Final Report concerning condensate pump room modifications resulting from the June 30 meeting between the AEC staff and Commonwealth Edison.
This. report, the 10-day letter reporting the flooding incident dated June 14, 1972, the July 10 Interim Report, and the July 24 Change to the Interim Report, complete our submittals on this item.
If you need any additional information, please feel free to contact me.
Very truly yours,
[!
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l Byron Lee, Jr.
(j Assistant to the President
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Final Report on Condensato Fwap Room Modifications for Qund Citics AEC Docl:ot Hos.
$0-2515 and 50-265 Ocynero1:
As o result of the recent flooding of the Unit 1 condonsato pump rooms due to a rupture of a circulatinc unter pipe o.xpension joint tho follouing desirn changon have been initiated (chongos portain,
to both Unit 1 ond Unit 2 unless stated othorniso):
1.
Scaling off the condenser pit from the condensato pump room to precludo flooding the condennoto pump room _(chould thoro bo a recurrence of the abovo incident or a hot well rupturo ).
2.
Enclosing the HHR service unter pumps and tha diosol generator cooling water pumps in watertight vaults to be protected fron untor should the condensato pump room bocomo flooded by a contoninnted condenanto system failure, due to a clean con-donsato systen failure, duo to draining of the hotuoll throuch brokon condonnate piping, or due to any combination thoroof.
Moto:
Soo figuros 1, 2, and 3.
Design Details:
In ordor to realizo the goals stated in paragraphs 1 and 2 above, the following shall be accomplished:
1.
Scaling the condonsor pit from the condensato pump room.
A.
Provisions havo boon mado in the fiold to scal off tuo ventilating openings botuoon the condonsor pit end the condensato pump room.
The ventilating openings have boon closed by means of a 1" plate-to which 8" channels have bocn attachod on the upperside for support.
This entiro assembly has boon anchorod into the concrote with 1/2" dia. cinch-anchors on 6" centers on all four sidos.
The ventilation closuros havo boon analyzed and have boon found acceptable to uithstand a 30' head of water in addition to a 0.16 g vertical accoloration as applied to the mass of water.
The plato and structural membors providing these closures undergo stresses which do not exceod 1-1/3 times the working allowable stressas for the materials.
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D.
The porconnel acccca dooruny han boon closed off by noans of a 1" p19to billhhond in'ich has been nupported by horirontal benn sect 1.one.
This plato bulkhood has boon scaled to the concrete ngninst untor coopono.
The bulhhond uill be a tonporary clo. auro until it is replaced by a pornanent unterti ht door.
t Tho bulkhcad has been unnlyzed and hos been found adequato to uithstand a 308 hond of untor in addition to a 0.2h g horizontal accoloration es appliod to tho mass of water.
The plato and struc tural menborn pro-viding this cloauro undergo stresses which do not oxcood 1-1/3 times the working allowable stress for tho matoriels.
The permanent watertight door shall be designcd to moot the above criteria.
C.
The concreto un11 oxisting betwoon the condonner pit and the condensato punp roon originally provided a unterti;;ht bnrrior botueen the tuo with the exception of the openincs nontioned above.
Af tor the flooding of tho condensato punp roon, the existing concrete wall and the turbino foundation piors which are on intogral part of this unl1 woro analycod nnd found capablo of withstanding a hnad of water of 30' o ctir.g on the condonsor side of the well.
In nddition to the hydrostatic water proscuro, a seismic occurrenco with a basic 0.2h g ground acceleration was factorod into the analysis.
The con struction of tho existhag wall is more than adequato to contain the uator pressure end the offects of the solanic occurrenco with strescos in the concreto nnd reinforcing steel not oxcoeding 1-1/3 timas the allowable working stresses.
D.
It is recognized that the flooding of part of the condensato pump roon nnd the condoncor pit is an additional load onto the foundation of the structure.
The added wei::ht of water on the foundation is more than adoquatoly supported directly on the founding rock through the concroto mat on which the structuro rosts.
2.
Enclosing the RHR service water pumps and diesel generator cooling water pumps.
A.
A separate wall will be installed to encloso each of the throo BHR service wator pump areas in Units 1 and 2.
Thoso walls have boon designed for a 30' head of water on the outside of the wall.
In addition the horizontal offect duo to a bnaic 0.2h g coismic occur-rence has boon imposed upon the abovo hydrostatic
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pronauro.
Whnro noodod, n coiling hon boon dentr; nod to withstand thn oriu ta o f n 0.16 g vertien1 ncooloratian; whoro collinga alrendy oxist, they hnvc been ennlynod to this criterin nnd found ac ceptnblo.
Tho wnlla rnd colling nro enpable or reale t.in: thla conbi ned londing utth stronnec not oxceeding 1-1/3 timon the allounblo for thn concre to and reinforcing stool.
Accons into the Idm service water pump vnulta cronted by thoco walls ohnll be by nonna or a tool bulkhond doors which are donir; nod to the anno cr.itorin na the unlla.
The now unlla ohn11 bo koyod into the existing walla and nloba and enchored with drillod-in anchorn. Stroanos in thoco reinforeLng ual33 nre such that no cracking in oxpocted to occur uhich would enuco flooding of those 1111H corvico water pump vaults.
B.
The diocol conorntor coolinn water pump No. 1/2 shall bo moved from its procent locntion in the RHH corvico water pump 1D bay to the PHR acrvico wator pump 1B ond 1C bny.
The pump dicchnrgo lino shnll be voroutod to follow the "20" colamn rou in an cautcrly direction, through the condenaer pit to a tio into its pronont location nt column rou "20".
C.
The piping previounly loc,ted in the nron immedintoly around the PHR pumpn ohn11 be vorouted outsido the Blm servico water punp vaulta except for thono piping nyutoms addroaned in 2.P.
D.
The heating nyatom condonanto return units and piping presently loc nted within tho vnult nron shall be removod and relocated.
E.
The Rim norvico water baco plato drainn are prosently pipod togethor and run to the equipment drain cump.
In ordor to provent water backing up from outsido the vaulta or from one veult to another, the d rainn from baso platos in the coparato rooms shall bo piped separntoly to the cunp and those linea chall have a chock vnlvo installod at the cump to provent back flow.
F.
The following piping in nocessnry insido the vaults and thoroforo shall remain with propor sealing at ponotrations:
Firo protection hondors and branch linos Hypochlorito injoction piping for Rim service water Rim service water pump soal piping i
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-u-The follouing pipinc shall romein in the vaults beenuse of the complexity of its renoval:
Control Eod drive pump discharco lines Two plumbing headers por unit running from floor abovo straicht doun into floor The control rod drivo pump dischargo lines arc locetod only in the vnults uith the 1A and 2D PHR servico nator pumps and so a singlo failuro of this line could not flood all H~iR panps.
The plumbing headers arc similarly located so thnt a sinclo failure of t his header will not load to a failure of all tho RHR pumps.
G.
A lovel switch shall be ndded insido nach vault which shall alarm in the control room upon detecting water lovel of 1" in the vault.
H.
All unnocessary electrical conduit, junction boxes, etc.
shall be romoved from the vaults.
Pono trations for the nocessary electrical fixtures shall be sealed.
1.
In ordor to provent the overheating of the RHR servico untor pump motors when they arc in operation, each pump motor shall be cooled by a cubiclo coolor capable of maintaining 10$ F room nnbiont temporaturo.
Cooling water to each cubic 1c coolor shall bo supplied by ita respoetivo RHR service unter pump.
Thoso coolers are identical to coolors which have boon specified and installed at tho Zion Station (Docket No. $0 295), and have boon designed and constructed for solamic Class I conditions.
The coolers are manufactured by the Buffalo Forgo Company.
J.
All itoms will bo completed by November 1,
1972.
Conclusion It is our conclusion that adequato steps are being taken to proclude the loss cf all RHR service unter and diosol generator cooling water pumps due to flooding of the condensate pump room.
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