Whole-bundle heat balance and water properties

Process demonstration — unvalidated engineering estimates. Assumptions, transferred estimates and unresolved requirements remain explicit. This readable view does not change the source evidence.

Scope and observations

Item	Definition or value
Classification	Conditional pre-A global heat/enthalpy screen; unaccepted geometry/power assumptions. Not local CFD, pilot acceptance or a DNBR result.
Reused heos saturation	evidence/coolprop-runtime-saturation-r1.json
Completed native property calls	9
Native spatial solver runs	0
Provider	Unchanged JerryMansikkaviita/CoolpropMCP 6e446f0f57b3e88716bbed92adb0495af32a44c9; CoolProp 8.0.0
Observation limits	Required T/P/density/enthalpy fields are finite; null optional IF97 compressibility factor remains null.; Native vapor quality is undefined/null in these single-phase states. The negative equilibrium enthalpy coordinate is not a negative vapor mass fraction.; HEOS/IF97 agreement in one library is formulation consistency, not independent experimental validation.; A subcooled bundle-average state does not establish local subchannel states, wall boiling, heat transfer coefficient, contact/grid effects or CHF applicability.; Other-rod power, span, enclosure, constant pressure and adiabatic steady energy assumptions are proposals.; No local flow field or heat-transfer correlation was implemented. Existing solver properties and native CHF method remain unresolved.
Method implication	Consider supported pre-CHF/subcooled methods; do not require a full two-phase spatial simulation solely because DNBR is requested. Selection still requires an existing applicable CHF implementation, compatible local fields and a relevant contact/bow/grid benchmark with uncertainty.
Main study run	Not established / not reported
Public release	No

Conditions

Item	Definition or value
Recorded at	2026-10-16T14:43:48.412361+00:00
Classification	Conditional pre-A whole-bundle energy/property screen, not accepted basis or case CFD/DNBR.
Equations	A_open = enclosure_width² - 25pirod_OD²/4; m_dot = supplied_G * A_open; Q = 25 * proposed_rod_linear_power * proposed_length; h_out = actual_MCP_h_in + Q/m_dot
Supplied	Rod od m: 0.0095; Mass flux kg m2 s: 3000; Pressure pa: 15500000; Inlet temperature k: 563.15; Bowed rod linear power w m: 25000
Proposed	Enclosure inside width m: 0.063; All 25 rods at supplied bowed rod linear power: Yes; Lengths m: 0.5; 1; 1.5; Pressure constant: Yes; Adiabatic enclosure: Yes; Inlet away from grid: Yes; Steady no storage or work: Yes
Derived	Open inlet area m2: 0.002196945; Mass flow kg s: 6.590836; Nominal per rod mean heat flux w m2: 837657.6
Reused inlet run id	4ac275dfa69547b0946ebb83951ceb22
Inlet sources	Heos: Path: qualification/water-basis-r1/inlet_heos.json; Sha-256: 5a74291a0cb9939b884e5adcab86cbf71e97efd47b8f63ac8830c02ed6c082ae; If97: Path: qualification/water-basis-r1/inlet_if97.json; Sha-256: dfecba202a829309ece0e9414a9648c9367c2fcb6f1b9c1c2af7b674b90b3511
Requests	Id: heos_length_500; Backend: heos; Length m: 0.5; Total power w: 312500; Mass flow kg s: 6.590836; Enthalpy rise j kg: 47414.32; Arguments: Fluid: Water; Input1 key: P; Input1 value: 15500000; Input2 key: H; Input2 value: 1331812; Id: if97_length_500; Backend: if97; Length m: 0.5; Total power w: 312500; Mass flow kg s: 6.590836; Enthalpy rise j kg: 47414.32; Arguments: Fluid: IF97::Water; Input1 key: P; Input1 value: 15500000; Input2 key: H; Input2 value: 1331581; Id: heos_length_1000; Backend: heos; Length m: 1; Total power w: 625000; Mass flow kg s: 6.590836; Enthalpy rise j kg: 94828.64; Arguments: Fluid: Water; Input1 key: P; Input1 value: 15500000; Input2 key: H; Input2 value: 1379226; Id: if97_length_1000; Backend: if97; Length m: 1; Total power w: 625000; Mass flow kg s: 6.590836; Enthalpy rise j kg: 94828.64; Arguments: Fluid: IF97::Water; Input1 key: P; Input1 value: 15500000; Input2 key: H; Input2 value: 1378995; Id: heos_length_1500; Backend: heos; Length m: 1.5; Total power w: 937500; Mass flow kg s: 6.590836; Enthalpy rise j kg: 142243; Arguments: Fluid: Water; Input1 key: P; Input1 value: 15500000; Input2 key: H; Input2 value: 1426641; Id: if97_length_1500; Backend: if97; Length m: 1.5; Total power w: 937500; Mass flow kg s: 6.590836; Enthalpy rise j kg: 142243; Arguments: Fluid: IF97::Water; Input1 key: P; Input1 value: 15500000; Input2 key: H; Input2 value: 1426409
Limits	Global mixing/enthalpy accounting only. No local flow redistribution, surface temperatures, rod contact, grid losses, pressure drop, boiling onset or CHF.; Same library with different HEOS/IF97 formulations is a consistency comparison, not independent experimental validation.; Only bowed-rod linear power is supplied; other rods/length/enclosure are unaccepted proposals.; A subcooled bulk estimate cannot establish local single-phase flow or DNBR applicability.

Backend consistency

Length m	If97 minus heos outlet temperature k
0.5	0.007764664
1	0.01216136
1.5	0.01164352

Native property runs

Run id	State	Started at	Completed at	Duration s
4ac275dfa69547b0946ebb83951ceb22	completed	2026-10-16T14:41:19.103993+00:00	2026-10-16T14:41:33.981749+00:00	14.87776
13453c8c10544f8fbf40e34f3dbd561a	completed	2026-10-16T14:44:02.688862+00:00	2026-10-16T14:44:12.163083+00:00	9.474221

Checkpoints

Item	Definition or value
A	Not submitted/accepted
B	Not accepted
C	Not accepted

Source record and traceability

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SHA-256: 9e7645a210fc5152aba82a97336e0316410aef9759d73209c0df78036b26e31d

Presentation generated from this retained record. Historical status fields describe the source revision; later review decisions are explained on the engineering review page.