PNNL FRAPCON-3 Errata

NUREG/CR-6534 Vol.2

  1. The equation under equation 2-13 should be changed from:

    F=1/[1/ef +(rfs/rci)(1-1/ec)]

    to:

    F=1/[1/ef +(rfs/rci)(1/ec-1)]

NUREG/CR-6534 Vol.1

  1. PNNL has discovered that in equation A.7 on Page A.5, the units are not given for the saturation areal density of gas.  The units for NS as the equation is given in A.7 are atoms/m².  In the code, this equation is divided by Avogrado's number to give the saturation areal density of gas in units of moles/m²

NUREG/CR-6534 Vol.2

  1. PNNL has discovered an error in the flowchart in figure 3.1 on page 3.2 of NUREG/CR-6534 Vol.2. The gas loop should end after the calculation of the total rod gas plenum temperature and gas pressure.  The updated figure can be seen below
     

NUREG/CR-6534 Vol.1

  1. PNNL has discovered an error in equation 9.5 on page 9.10 of NUREG/CR-6534 Vol.1.  The definition of n(T) is given as

    2. n(T) = 9.490E-2 + T•(1.165E-3 + T•(-1.992E-6 + T•9.588E-10))
    it should be
    n(T) = -9.490E-2 + T•(1.165E-3 + T•(-1.992E-6 + T•9.588E-10))

    It should be noted that this relationship for n(T) is valid up to1100 K.  Above this temperature, FRAPCON-3 has other relationships for n(T), although cladding temperatures should not go above 1100 K in the steady-state application. 

    Likewise, the definition of K(T) on page 9.8 of NUREG/CR-6534 Vol.1 is valid up to 750 K.  FRAPCON-3 has other relationships for K(T) above this temperature, although cladding temperatures should not go above 750 K in the steady state application

    The FORTRAN in the FRAPCON-3 codes is correct in this regard; this is a documentation error, not a FORTRAN error.
     

NUREG/CR-6534 Vol.3

  1. C.B. Lee of KAERI points out that Figures 3.9 and 3.10 in NUREG/CR-6534 Vol.3 are in error. They are supposed to be code-data fuel temperature comparisons for IFA-432, Rod 3, but the published figures correspond with Figures A2.9 (a) and (b) from the same document, which relate to IFA-432 Rod 1. The corrected figures are shown below.
    2. Figure 3.9


    Figure 3-9. FRAPCON3 predictions of temperature and upper thermocouple data as a function of time for IFA-432 Rod 3.
    Figure 3.10

    Figure A2.7
    Figure 3-10. Measured and predicted centerline temperature versus time for the lower end for IFA-432 Rod 3. 

NUREG/CR-6534 Vol.3

  1. PNNL has discovered that Figures A2.6 and A2.7 in NUREG/CR-6534 Vol.3 are plotted against a time scale that is inconsistent with the time scale used for all other IFA-432 data plots and code-data comparison plots. The corrected figures are shown below. 
    2. Figure A2.6


    Figure A2-6. Rod 3 measured LHGR vs. time.
    Figure A2.7

    Figure A2.7
    Figure A2-7. Rod 3 measured temperature vs. time

NUREG/CR-6534 volume 1, Section 4.4 (delay to onset of fuel swelling)

    A. Shestopalov of the Kurchatov Institute, Russia, points out that the delay to onset of fuel swelling imposed within the FRAPCON-3 fuel swelling model (subroutine SWELL) is 6.0 MWd/MTU, not the 2.13 MWd/MTU implied in Section 4.4 (page 4.5) of Volume 1 of NUREG/CR-6534.

NUREG/CR-6534 (volume 1)

  1. Chan Bock Lee of KAERI and others have pointed out that Figure 6.4 in Volume 1 of NUREG/CR-6534 is erroneously and exact copy of Figure 6.5; Similarly, Figure 6.6 is a copy of Figure 6.7. The correct versions of Figures 6.4 and 6.6 for Volume 1 are shown below. Click graph for a larger image.
    2. Figure 6.4

    Figure 6.4
    Figure 6.6

    Figure 6.6

NUREG/CR-6534 (PNNL-11513 volume 2)

    Volume 2, page 2.13 (section 2.3.4.3 on Conductance through points of contact)

    The units for the various parameters in the equations are wrongly defined with respect to the numerical constants in the equations. In particular, hsolid is in BTU/second/ft2-°F; the conductivities are in BTU/second/ft-EF; and the roughnesses are in inches; except R2 is in microinches.

    The simplest fix is to replace this section with 7.3, pages 7.2 and 7.3 of Volume 1. The latter section is consistent with the FORTRAN in subroutine GAPRS and is in consistent units.

NUREG/CR-6534 (PNNL-11513 volume 3)

    Volume 3, Appendix A.8 ("Case input for NRX Test Rod CBP") page A8.4, Table A8.4:

    Table Title should read "FRAPCON-3 Input for NRX Test Rod CBP and Notes on Derivation"

    and the the entry for "totl" should read 0.798 (feet), not 0.6885. Because of the nature of the test/input, this error has no effect on predicted results.

NUREG/CR-6534 volume 1, Section 10 (Axial Growth Model)

    The value of the constant "C" in the axial growth model (page 10.4) should be 9.09E-25, not 2.8E-25 per n/m^2. The value is quoted correctly in Figure 10.2 (Page 10.3), because in that figure the strain is quoted in %. The FRAPCON-3 coding is correct; only the documentation in volume 1 page 10.4 is in error.
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