ML17321A170
| ML17321A170 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 10/10/1984 |
| From: | Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| AEP:NRC:0500P, AEP:NRC:500P, NUDOCS 8410180122 | |
| Download: ML17321A170 (10) | |
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REGULATOR'r INFORMATION DISTRIBUTION S
~TEM (RIDS)
ACCESSION NBR:8u10180122 DOC,DATE: eA/10/10 NOTARIZED:
NO DOCKET FACIL:50-315 Donald C,
Cook Nuclear Power P'lant'nit 1~ Indiana 8
05000315 50 316 Donald C ~
Cook Nuclear Power Plant~ Unit 2~ Indiana 8
05000316 AUTH,NAME AUTHOR AFFILIATION ALEXICH<M,P, Indiana 8 Michigan Electr ic Co ~
REC IP ~ NAME RECIPIENT AFFILIATION DENTONrH ~ RE Office of Nuclear Reactor Regulationi Director
SUBJECT:
Forwards response to NRC request for addi info on hydrogen combustion 8 control program re ice condenser lower inlet door flow proportioning springs 5 shock absorber assemblies 8 dimensions 8 weight of inter mediate deck doors.
DISTRIBUTION CODE:
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INDIANA8 MICHIGAN ELECTRIC COMPANY P.O. BOX 16631 COLUMBUS, OHIO 43216 October 10, 1984 AEP:NRC:0500P Donald C.
Cook Nuclear Plant Unit Nos.
1 and 2
Docket Nos. 50-315 and 50-316 License Nos.
DPR-58 and DPR-711 RESPONSES TO NRC STAFF QUESTIONS ON HYDROGEN CONTROL Mr. Harold R. Denton, Director Office of. Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Denton:
This letter and its Attachment responds to your staff's recent verbal request for additional information on the Donald C.'Cook Nuclear Plant hydrogen combustion and control program.
More specifically, your staff requested information with regard to the ice condenser lower inlet door flow proportioning springs and shock absorber
,assemblies, the dimensions and weight of the ice condenser intermediate deck
- doors, the ice condenser flow area, and the CLASIX computer code model for the air return/hydrogen skimmer system fans.
The requested material is provided in the Attachment to this letter.
This document has been prepared following Corporate Procedures which incorporate a reasonable set of controls to ensure its accuracy and completeness prior to signature by the undersigned.
Very truly yours, M. P. Ale Ach Vice President IO MPA/dam Attachment cc: (attached) 8410180i22 84iOiO
Mr. Harold R. Denton AEP: NRC: 0500P eo:
John E. Dolan M. G. Smith, Jr. - Bridgman R.
C. Callen G. Charnoff E.
R.
Swanson - NRC Resident Inspeotor, Bridgman A. Sudduth - Duke Power Company, Charlotte, NC D. Renfro - Tennessee Valley Authority, Knoxville, TN
Provide informat1on with regard to the ice condenser lower inlet door flow proportion1ng springs.
In particular, the value of the spring constant is desired.
From the Donald C.
Cook Nuclear Plant Updated Final Safety Analysis Report (FSAR), Volume XIV (Appendix M), page 6.9-7:
.Each [ice condenser lower inlet] door is provided with four, ASTM-A-313, Type 304 flow proportioning springs, with a spring constant, per spr ing, of 0.62 lb/in.
One end of each spring is attached to the door panel and the other to a spring housing mounted on the door frame.
These springs provide a door return torque proportional to the door opening angle and thus satisfy the requirement for flow proportioning.
In addition, they assure that the doors will close in the event they are inadvertently opened during normal plant operat1ons.
Provide information with regard to the ice condenser lower inlet door shock absorber assemblies.
From the Donald C.
Cook Nuclear Plant Updated
- FSAR, Volume XIV (Appendix M), page 6.9-8:
.In order to diss1pate the large k1netic energies resulting from pressures acting on the [1ce condenser lower inlet] doors during a LOCA, each door is provided with a shook absorber assembly.
The shock absorbing element is a wedge shaped foam plastic pad 89 in. high, 32 in.
- wide, and 28 in. thick at, its maximum section.
The pad is bonded to a base plate which is bolted to the ice condenser lower support structure.
The front and sides of the pad are covered with 0.008 in. thick ASTM A240 (Type
304) stainless steel protective covers.
The top cover is solid while2the side covers are perforated with 0.020 in. diameter holes, 952 per in.
, to allow air to be expelled from the pad during crushing.
.In operation, the door panel first contacts the shock absorber pad at an opening angle of 55 and crushes to approximately 30$ of its original 0
thickness.
Stopping forces are distributed evenly over the outer two-thirds of the door panel, centered about the door center of percussion.
The foam material is selected to provide an essentially constant crushing force over its crushing distance with minimum elastic recovery.
Thus forces and bending moments on the door are minimized and, t
once opened, there is a negligible tendency for the door to "bounce" closed again.
How was the CLASIX computer code intermediate deck flow area of 1326 ft2 computed for the Donald C.
Cook Nuclear Plant?
A review of our records has indicated that this value first appeared in documentation supplied by Westinghouse Electric Corporation/Offshore Power Systems.
Since Offshore Power Systems is no longer in business, it would be difficult to resurrect the basis for this number.
In lieu of a time consuming and extensive r ecords search, it was decided to perform a recalculation of the flow area.
The recalculation of the area just below the intermediate deck, using ice condenser dimensions of 113.0 ft O.D.
and 91.0 ft I.D. (where allowance has been made for 1 ft of insulation on both the containment and crane walls), with a cross-yection covering 288 of arc, 0
indicates that the maximum flow area is 2820 ft 2 From this maximum value the total cross sectional ice basket area of 1527 ft (based on 1944 ice baskets, each of 1 ft diameter) is subtracted This yields an unobstructed flow area through the ice condenser of 1293 ft, or about 2.5$ less than the CLASIX code input value.
It is to be noted that the flow area computed above is the flow area just below the intermediate deck, rather than the actual deck area itself.
Provide information with regard to the dimensions,
- weight, and number of ice condenser intermediate deck doors.
t s
o The Donald C.
Cook Nuclear Plant Updated FSAR, Volume XIV (Appendix M),
Table 6.12-3, states that the maximum dead weig)t for an ice condenser intermediate deck door panel is 5.5 lbs. per ft.
Using the dimensions of the ice condenser intermediate deck door panels provided by Westinghouse, the following table has been generated:
Number of 2mm=
Area of 2 Maximum Dead 48 48 48 48 2'-1/4" x 4'-1/2" 2'-1/2" x 4'1-1/4" 2'-1/2" x 5'-1/2" 2'-1/2" x 5'"
12.43 11.73 11.42 11.69 68.4 64.5 62.8 64.3 Provide additional detail with regard to the modeling of the air return/hydrogen skimmer system fans in the CLASIX computer code.
The CLASIX computer code is capable of simulating up to nine fan flow paths within an ice condenser containment.
For each fan flow path, the code user must specify the fan flow source and sink volumes, the fan start and stop
- times, and a fan flow multiplier.
Each fan flow path is also assigned a fan head/flow table of values which is input to the code.
Up to nine fan head/flow tables may be specified by the user.
The CLASIX code performs the required calculations for the fan flow paths during each time step.
Reviewing one fan flow path at a time, the CLASIX code sets the fan flow to zero, then compares the actual accident time to the fan start and stop times. If the accident time is less than the start time, or greater than the stop time, the fan flow for that path remains zero.
If the fan is determined to be running, the CLASIX code computes a fan head in inches of water, based on the total pressures in the fan flow path source
, 'nd.-sink volumes.
The fan.head/flow table of values for that flow.path is then consulted in orde'r to determine the associated flow rate in ft /min.
The first flow value in the table is used if the actual head value is less than the first head value in the table.
Likewise, the last flow value in the table is used for all head values greater than the last input head value.
Intermediate values of flow are linearly interpolated from the table.
The computed flow rate along the fan flow path is then multiplied by the fan flow multiplier for that flow path.
This yields a fan flow path flow rate which is later used in the computation of mass and energy transfers between containment subcompartments.
This mass and energy transfer is assumed to take place in addition to those transfers caused by differential pressures across subcompartment boundaries.
Mr. Harold R. Denton
~ 3<<
AEP:NRC:0500P bc:
J.
G. Feinstein/D.
A. Medek H. N. Scherer, Jr./T. 0. Argenta/S.
H. Horowitz J. J. Markowsky/S.
H. Steinhart/J.
A. Kobyra R.
W. Jurgensen R. F. Kroeger J. F. Stietzel - Bridgman T. P. Beilman - Bridgman J.
B. Shinnock D. L. Wigginton - NRC, Washington, DC AEP:NRC:0500P DC-N-6015. 1
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