ML20003D000
| ML20003D000 | |
| Person / Time | |
|---|---|
| Issue date: | 06/27/1980 |
| From: | Odar F NRC |
| To: | |
| Shared Package | |
| ML20003C956 | List: |
| References | |
| NUDOCS 8103181038 | |
| Download: ML20003D000 (9) | |
Text
.
d MEASUREMD!T REQUIREMENTS FOR ASSESSMENT 0F SMALL BREAK LOCA CODES F. ODAR 4
8103131038
I 2
PHENOTNA 0F INTEREST IN SMALL BREAKS I.
MASS BALANCE A.
BREAK FLOW B.
ECC FLOW C.
VESSEL INVENTORY - MASS DISTRIBUTION D.
STEAM GENERATOR - MASS DISTRIBUTION E.
PHASE SEPARATION - HORIZONTAL AND VERTICAL COMPONENTS F.
PRESSURIZER INVENTORY G.
NONCONDENSIBLES l
l II.
ENERGY BALANCE A.
BREAK FLOW B.
ECC FLOW C.
STEAM GENERATOR HEAT TRANSFER D.
CORE POWER E.
CLAD TEMPERATURES l
i F.
LIQUID TEMPERATURES I
i G.
HEAT LOSS i
l i
L
l III.
MOMENTl!M BALANCE h.
FLOW RATES AND PRESSURE DROPS 1.
NATURAL CIRCULATION STEAM GENERATOR H.T.
FEED AND BLEED PHASE SEPAPATION - REFLUX BOILING NONCONDENSIBLE B.
PUMP DEGRADATION
- UPSTREAM INCLUDING LOOP SEAL
- DOWNSTREAM INCLUDING DOWNCOMER C.
PHASE SEPARATION AND VOID DISTRIBUTION I" ALL COMPONENTS - VESSEL, S.G., PIPING, EFFECTS OF l
ECC INJECTION D.
EFFECTS OF GEOMETRY AND SCALING l
l i
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SUMP %RY OF IMPORTANT XEASUREMENTS l
- a. 5ystem anss balance as affected by:
- 1. Flow through the break.
- 2. ECC injection,, and l
3.
Effects of geometry and scale on the sfratified or homogeneous flow pattern at the break.
- b. Heat balance as affected by:
- 1. Cort void distribution,
- 2. Core heat transfer,
- 3. Heat leakage to environment through pipe and components walls,
- 4. Void distribution on the primary and secondary side of l
- 5. 5.G. secondary side pressure,
- 6. 5.6. secondary side steam exit flow rate and feedwater flow rate and temperature,
- 7. Flow rates (and directions of flow) of the liquid and the vapor phases, through the 5.G. tubing,
- 8. 5.G. heat transfer regimes,
- 9. Thermal energy delivered to the coolant by the pumps, and
- 10. Effects of geometry and scale in Ited 1 through 9.
- c. Coolant flow through t"e primary system as affected by:
I
- 1. Coolant properties (void fractien, velocity) at pump (s) inlet,
- 2. Ptsep head and torque degradation effect on the water level in downconer.
l
- 3. Void distribution in all vertical sections of piping (loop seals) and of system components (vessel 5.G.),
- 4. Flow stratification in the horizontal pipes and recognition of l
flow direction and velocities of each phase, i
l
- 5. Natural circulation of the single pnase and of the two phase l
types including the reflux heiler type, l
- 6. Effects of feed and bleed (through break ficw) on natural circulation, and
- 7. Effects of geometry and scale on Itees i through 7
SUMMARY
OF MINIMLM MEASURE *ENTS I
Break Flow:
- Mass flow rate through the break and any cther location threugh which the coolant is escaping the system.
- Enthalpy flux for the fluid leaving the system (through the break or other locations).
- Void fraction and indication of flow regime of fluid reaching the break.
~4.
Steam Generato.r Performance as it affects the system behavior:
- Secondary side pressure
- Secondary side feedwater and steam line flow rates and fluid tenperature.
- Axial pressure differentials on the secondary side. Overall DP is a must; axial distribution would be welcome.
"SS"- Fluid axial temperature distribution on the secondary side "SS"- Outer surface temperatures of tubes "SS"- Mass flow rate and average void fraction entering and leaving i
l the primary side
- Pressure differential, inlet-to-outlet of primary side.
- Fluid temperatures of inlet and outlet of the primary side
- Fluid density or average void fraction at inlet and outlet of the primary side in LOFT, together with indication of flow regime.
3 System cressure and pressure distribution in loop.
- 4. 'Systen mass distribution:
- DP (axial) in all vertical corponents including vessel, pressurizer, loop seals (both the S.G. and pump sides) and accumulator
- Average void fraction in spool pieces located in horizontal pipes.
together with Indication of flow stratification "SS" - Axial void distribution in the reactor vessel
- Mixture level indication in the upper plenum, upper head, and core rir. L0i 5.
Ccre heat transfer:
- Heater rod or fuel (cladding) temperatures (axial and lateral distribution)
- Fluid temperatures in core 6.
Fluid temperatures throughout the system, especially where stratifi-cation or phase separation is expected.
7.
Fluid velocities in hot legs, cold legs, and at core exit (in LOFT).
Velocities and flow directions of the individual phases are of interest for stratified and countercurrent flows in horizontal pipes.
8.
Pump perfonnance:
i
- Pressure differential across each pump l
- Mass flow rate, or volumetric flow rate, or phase velocities at pump inlet
~
- Average void and flow pattern at pump inlet (and outlet if fea sible)
--m-.
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