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. Commonwealth Edison. Company ONE P8 MBT NATIONAL PLAEA
- CNICAGO. 8LL8NOle AM.m tw4 so.
PO 57 O f PIC S BO X Fo r
- CMIC AGO, IL LIN OIS 6049 0 October 13, 1972 9
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4 81 Mr. Donald J. Skovholt C
Assistant Director for
' -2 Operating Reactors b
Directorate of Licensing J
U. S. Atomic Energy Commission Washington, D. C.
20545 l
Subject:
Additional Information Concerning the Condensate Pump Room Modifications for Quad-Cities Units 1 and 2, AEC Dkts l
e7v-2543 nd 50-265
Dear Mr. Skovholt:
Your letter of September 13, 1972 requested additional information on the permanent modifications to the Quad-Cities Units 1 and 2 Condensate Pump Room.
The following information is provided in response to your letter:
Question la The seismic design for the compartments, as stated in the report, takes into account the head of flooding water combined either with vertical component g
of seismic acceleration or with the horizontal component of seismic f*,
00T16972r r acceleration.
Since this design
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Qh approach may not be sufficiently
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conservative, provide the bases for not combining the components of horizontal and vertical seismic acceleration r
simultaneously with the water loading.
Answer 1:
Where vertical and horizontal effects of seismic acceleration interacted they were combined and treated as happening simultaneously with the water loading.
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Comi..onwealth Edison Company Mr. D. J. Skovholt October 13,_1972 Question 2:
The sloshing of water level in the flooded compartments under seismic excitations may impair the structural integrity of seismic Class 1 structures and components.
Indicate the manner by
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which this effort will be taken into account in the design of the structures under'the coincident loading of flooded compartment and earthquake.
Answer 2:
Under the coincident loading of flooded compartment and earthquake sloshing effects were included with the hydrcatatic pressure.
The sloshing effects were included per the AEC publication, " Dynamic Pressure of l
Fluid Containers," Nuclear Reactors and Earthquakes TID-7024.
Question 3:
Describe the inspection program that will be implemented to assure that gasketed, sealed, or caulked structural elements will be maintained in serviceable conditions and will not result in conditions which could cause flooding.
Answer 3:
This program is presently under review.
A program will be addressed in the report on the permanent modifications which will be submitted about October 23, 1972.
Question 4:
Explain how electrical components (including connections) for supplying power to the residual heat removal service water and diesel generator cooling water pumps, instrumentation and controls are protected to assure operation of the pumps if the condenser pump room were to be flooded.
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Comn.onwealth Edison Cornpany.
October 13, 1972 Mr. D. J. Sko.v. holt
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' Answer 4:
Electrical cables supplying power to the RER service water. pumps and diesel generator cooling water pumps will~be sealed in the cubicle walls with Nelson type. fittings to prevent flooding of the cubicle.
Junction boxes connected to the conduit which penetrates.the cubicle' walls *will be l'
sealed with RTV (silicone rubber sealant)-
to prevent flooding of the cubicle.
Electrical cables and conduit which are below water level'and outside the cubicles will not be effected if submerged during the flooded conditions.
Instrumentation, controls and other electrical components which are susceptible
-to. water. damage have been located either inside the cubicles or at an-elevation above the flood level'.
Further information on both the interim measures
'and the permanent modifications will,be forthcoming per commonwealth Edison's discussions with the AEC staff.
One original and 39 copies of this report
'are provided for your use.
Very truly yours, r107\\
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7 Byron Lee, Jr.
Assistant to the President T A
.