ML20085D756
| ML20085D756 | |
| Person / Time | |
|---|---|
| Site: | Saxton File:GPU Nuclear icon.png |
| Issue date: | 10/08/1964 |
| From: | Layman W SAXTON NUCLEAR EXPERIMENTAL CORP. |
| To: | Dean R US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20083L048 | List:
|
| References | |
| FOIA-91-17 4875, NUDOCS 9110170128 | |
| Download: ML20085D756 (8) | |
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October 8, 196b Docket No. 50-lh6 DPR-h Technical Specifications Change hequest No. 16-Page ,1_ of 7
- 1. Description of Change take the following addition to the Saxton Te'mical Specifications:
Supplement No. 2 to Technical Specifications incorperating changes applicable to conduct of a Supercritical Technology Program in the Saxton Reactor Plant.
During the conduct of tests and experiments contained in the Super-critical 5 echnology Prcgram, the Technical Specifications shall be changed to the extent indicated belew, when fuel is installed in the supercritical loop and the Except to the extent as changed, all of the Saxton reactor is abcVe 1 MW't.
remaining provisions of the Technical Spccifications shall remain in effect.
A. SUPERCRITICAL M?EL ASSEMBLY
- 1. Enriched uranium dioxide (UD 2 ) shall be used for fuel, either sintered in the forn of pellets or vibration compacted and swaged or vibration compacted and " pressure bonded."
2 The fuel pellets will have dished ends initially and a void will be provided in the upper end plug to accommodate fission gas build-up.
The fuel clad will be Type 16-20 stainless steel or Incoloy, with nominal 3 The clad will rely upon the enclosed fuel wall thickness of 10.5 mils.
for support against the coolant pressure.
One rod is in the center with
- h. Seven fuel rods form the fuel assembly.The outer six rods are spiral wrapped with the other six surrounding it.
o.05" 0.D. wire, made of the same material as the clad which it is on.
5 The fuel assenbly is bolted to the upper grid and bolts tack welded in place. The rods art slipped into the lower grid to allow axial expansien-and restrict radial novement.
- 6. The red classer is etctained within three form-fitting hexagonal The fuel assembly baffles whdrP are velded at the top of the upper grid.
inner baffle is alsc welded to the lcwer grid at the bottom. The outer baffles are dimpled fer an interference fit;. to center the fuel assembly.
- 7. fhe upper grid is then hung from the outer, of the three, fuel assembly baffles which is we]ded to the spring guide at the top of the These baffles.
The inner two baffles are free tc expand axially at the top.
baffler separate inlet and outlet coolant flow.
- 8. The fuel assembly, complete with fuel assembly baffles and fuel assembly hanger baffles, is bolted to the pressure tube baffles and fitted into the pressure tube.
DPR-b Change R9 quest Noa 16 Page 2 of 7 j
- 9. The Saxton fuel assembly, into which the pressure tube is to be inserted, has 21 rods removed from its center and is located in core position E-1. ,
The center portion of it is designated experimental position N-h.
B. SUPERCRITIhAL COOLANT SYSTEM The supercritical coolant system consists of the pressure tube, pumps, heat exchangers, purification equipment, acccmulstor, specinen holders and necessary piping and valves. All equipment except the pressure tube shall be fabricated in accordance with the applicable ASME Boiler and Pressure Vessel Code er ASA Pressure Piping Code.
- 1. Pressure Tube The pressure tube assembly shall be of the baycnet re-entry type. Coolant at pressures up to h000 psig and temperatures to 1000 F enters the pressure tube th-ough a lower jumper and flows downward through the annulus formed by the pressure tube baffles and the fuel assembly bt.ffles. At the lower end cf the p: essure tute, the ficw direction is reversed to pass upward through the fuel assenbly and inner fuel arccably hanger baffles. The coolant leaves through the top jumper at temperatures up to 10000F.
A Marman ecnoseal pipe joint serves to support the pressure tube assembly on Die'?eactor head penetration.
The pressure tube assembly consists of five componentst the connector body, pressure tube extension, head adaptor flange assembly (each three of AISI Type 316 stainless steel), a co-extruded transition joint between stain- g less steel and Zircaloy-b and Zircaloy-L pressure tube.
The pressure tube is designed for an internal working pressure of h000 psig with no external pressure and externally 2200 psig with no internal pres s ure, j
- 2. Fumps Three electrically driven triplex positive displacement pumps are provided l
l to supply coolant to the pressure tube. Two 2-speed loop pumps are rated l
at 15 gpm each at full speed and 5000 psig discharge pressure and 7.5 gem I- each at half speed at the same pressure. A single speed standby pump is previded as a reserve which is rated at 5.3 gpm at the same discharge pressure. The second 2-speed loop pump is physically piped into the 1 cop but is net conne:ted electrically. In the event of failure of
+he fu st pump, the standby pump can te utihced while the-wiring is changed to the second pump.
All parts in contact with the coolant are fabricated of austenitic stainless steel or equivalent ccrrczion resistant material.
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3 Heat Exchangers 4
- a. Heater - The heater, with a rated capacity of 650 KW, raises the #'
coolant temperature to the required pressure tube inlet conditions.
i Forty-twc individual heaters are provided in three parallel paths of austenitic stainles s steel pipe. A saturable reactor is provided to vary heater volcage and current to establish constant pressure tube inlet temperature.
2 DPR-L Change Request No. 16 Page 3 of _l,
- b. Interchanger - The interchanger is a regenerative heat exchanger utilizing three parallel paths of double pipe coils constructed of welded austenitic stainless steel and arranged concentrically about the vertical axis.
- c. High Pressure Cooler - The high pressure cooler utilizes a vertically oriented double pipe coil to cool the-tube side stream from the inter-The inner pipe changer to permit pressure reduction without flashing.is mad component cooling water, is carbon steel, Low Pressure Cooler - Th e low pressure cooler is constructed in the d.
same manner as the high pressure cooler to further cool the loop coolant to the deaerator conditions.
- h. Purification Eculpment .
The purification equipment, consisting of a deaerator, a demineralizer, a filter and two condensate pu.aps, is designed for full loop flow.
- a. Deaerator - the deserater separates and removes dissolved. and entrained gasee from the loop coolant and provides coolant storage and All wetted net surfaces -
positive su tion head for the cendensate pumps.
are austenitic stainless steel.
- b. Condensate Pumps - Two canned-moter units are arringed to cperate'in series, although they are piped such that each cai operate alone.
Both pumps may be required if both the main loor pump and standby pump are running. All parts in _ contact with the coolant are fabricated of austenitic stainless steel or equivalent corrosion' resistant material. .
- c. Radiation Monitor - An in-line radiation monito?_is located downstream l of the condensate pumps for continuous measurement of the loop radiation l
1evel.
( d. Demineralizer - A flushable, refillable, mixed bem _demineralizer is used to remove ionic impurities and corrosion products in the loop.
stain es; steel.
All wetted psrts are constructed of suster.iti:
Local radiation vaielding is used.
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- e. Filter _ - A cartridge type filter removes resin fines- escaping from the I
demineralicer. Construction of the filter container-is austenitic f
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stainless steel. Local radiation shielding is provided for the unit.
- 5. Specimen Holders Three specimen holders are provided to permit insertion of specimens in the coolant ficw stream. One holder is located downstream of theofheater All parts the and the other_two on either side cf the interchanger.
'hcider are fabricated cf austenitte stainless steel.
d D "" 's Change Request No. 16 Page h of 7
- 6. Accumulator An accumulator is provided to reduce pressure pulsations from the main coolant pumps. The necumulater is constructed of carbon steel whose interior is lined with a protective coating.
- 7. Piping and Valves All supercritical loop coolant piping is austenitic stainless steel.
Service piping for component cooling water and air is carbon steel or copper. Piping joints in the main coolant stream are welded except for remote disconnect couplings at the pressure tube and specimen holders.
Manually operated stop valves are provided to change flow circuitry, to i
pernit venting, filling and draining components and permit isolation of certain components for maintenance.
Remotely operated stop valves are used to isciate loop equipment not in use, by-pass varicus portions of the loep and vent or drain components not accessible during loop operati0n or decontamination.
All valves containing radioactive fluids, except instrument valves, are provided with leukoffs or backseats to maintain essentially zero leakage.
All valves in contact with the loop coolant are austenitic stainless steel.
C. AUXILIARY SYSTEMS i
- 1. Compenent Cooling Flow from the componer.t ecoling system of the Oaxton reactor is used to cool the folicwing pieces cf equipment in the supercritical loops high l pressure cooler, low pressure cooler, sample coolers, recombiner condenser, i and vacuum pump seal water cooler.
- 2. Shutdewn Cooling Shutdown cooling utilizes. the high pressure and low pressure coolers.
The circulation is provided by the condensate pumps. In addition, emergency cooling can be effected by using the emergency condenser.
- 3. Coolant Fbke-up The loop is filled by gravity frem the head tank to the pumps' suctions.
The head tank is a vertical cylindrical vessel constructed of stainless steel and designed for a pressure of 150 peig or full vacuam of 312 F.
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- h. Safety Injection During emergency conditiens, i.e., loss of flow or loss of coolant, the supply of pressurized water held in the coolent reservoir is discharged automatically to the accumulater connection of the loop following loss of ficw or to the pressure tube outlet line upon a loss of coolant upstream of the pressure tube.
l a. Coolant Reservoir - The coolant reservoir is a 25-gallon vertical
! cylinder constructed of carbon eteel designed for 5000 psig at 200oF. \
It contains demineralized water pressurized by a gas cylinder.
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DPR-h Change Request No.16 Page 5 of 7
- b. Reservoir Gas Cylinder - Tne reservoir gas cylinder holds the nitrogen used to drive the reservoir water into the loop. It is of all welded joint construction, carbon steel, and designed for 5000 psig.
- c. Oas Compressor - A gari compressor is provided to charge the reservoir gas cylinder and maintain its pressure at a specified value. It is designed to discharge 5000 psig with a suction pressure of 200 to 2500 psig supplied by a commercial container.
- d. Emergency Condenser - The emergency condenser consists of a pipe coil mounted in a vertical drum which is used to continue fuel cooling during an extended loss of coolant or a loss of flow accidens. An intermittent flow of make-up water balances the losses as it is boiled off in the drum. It is fabricated of austenitic stainless steel, provided with an overflow and vacuum break and designed for 15 psig shell and hh00 psig at 10000F tube side.
- 5. Pressure Relief The supercritical loop is protected from overpressure by relief valves ont
- a. Outlet line from the ic-asure tube,
- b. Discharge side of the loop pumps and standby pump,
- c. Discharge side of the gas compressor,
- d. Denineralized water line ' .pplying the coolant reservoir, and
- e. Component cooling water line.
Two rupture discs are also supplied. One protects the low pressure cooler from overpressure in the inlet. _ A second protects the deaerator from .
overpressure. An automatic valve is located between the pressure tube inlet and outlet lines to protect the interchanger in the event of pressure tube blockage.
- 6. Sampling '
Frovision shall be made to sample the coolant for crud, gad end liquid samples.
- 7. Decontamination The decontamination systen consists of a feed tank for mixing and storing decontamination solutions. It is constructed of stainless steel and is open to the atmospherc.
- 6. Reacter Head Nozzle Cooling System A bleed system for reacter coolant through the supercritical loop nozzle penetratien of the reactor vessel is provided to limit reactor nozzle temperatu:e to 650CF.
. ..e DPR-b Change hequest No. 16 Page 6 of 7 D. RADIVACTIVE WASTE DISPOSAL Liquid wastes from the supercritical 1 cop are drained to the Saxton Radio-active Waste Disposal Facility. ,
The supercritical loop gaseous waste disposal system consists of a vacuun pump which draws the gases from the deserator and pumps them to the recombiner package and its seal water system. The residue, af ter reco-bination, flows to the Saxton Radioactive Waste Disposal Facility.
E. WATER TREATMENT The supertritical loop is filled we a demineralized water initially from the Saxton plant supply. Since the loop contains a full ficw demineralizer and a deacrater, it is relatively insensitive to nake-up water specifications.
The following operating limitations shall apply to the sapercritical loop operation:
Maximum supercritical fuel assembly power level 136 KWt Maximum loop pressure h000 psig Minimum loop pressure 2000 psig Maximum supercritical pressure tube outlet tenperature 10000F Minimum loop flow 5 gpm Maximum 15-minute dcgassed gross activity of coolant 20 ue/cc-Maximum chloride concentration in loop coolant 0.1 ppm Manmum temperature of reactor vessel head flange 6500F Ifanyoftheselimitsareexceeded,actionwillbeinitiatedtobringthc\
condition tack within limits. -
In Supplement No. 1 to Technical Specifications, page h, change section labeled
" Change Item G. 3." to read Change Item G. 3 The reactor shall be automatically scram:wd ander the following conditions:
Conditions Set Point Fast startup rate (maximum) 2 decades / min.
High power level at startup (maximum) 25% full power High power level at power 20 Mdt operation (maximum) 2h Mdt 23.5 Mdt "
27 Mdt Lcw main coolant pressure (minimum) 1600 psig Low main coolant flow above 1 !+it(minimum) 2.2 x 106 lb/hr Lew water level in p 'essurizer (minimum) 8.3%
Loss of main coolant pump power Contact on breakers, failure of power supply, or loss of variable frequency set clutch excitation when variable frequency set is supplying power for uin coolant pump operation.
Main coolant temper 9ture(hm leg)(naximum) 55hoF
4 4 DPH.h Change hequest No. 16 Page 7 of 7 If the supercritical loop pressure tube is instriled in the reactor and it is fueled: '
Conditioj;s Set Point Loss of supercritical loop flow (minimum) 50% of normal flow set point, exceeding a preset time delay i Loss of supercritical loop coolant 2000 peig Loss of supercritical loop coolant Pressure drop reversal across ;
pressure tube ;
The stram sigr.a1 conditions associated with the supercriti;al icop need be merational only if a fveled pressure tube ir installed in the reactor. ,
- 2. Furpost;j7_phange i
T;:s tuipose of this change requert is to allow the insertion of a fueled '
pressure tub 6, forming a part of the supercritic11 loop coolant system into the ?
Saxton Reactor and permit the conduct of a Supercritical Technology Program.
- 3. Safety Considerations In our opinior., the proposed chance does not pienent significant hazards con: Aderations not described or implicit in the Final Safeguards Report.
- h. Health end bafety It is our opinion that the health and safety of the public will not be endar. cered by this change.
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