ML20059L435
| ML20059L435 | |
| Person / Time | |
|---|---|
| Site: | 07105641 |
| Issue date: | 09/17/1990 |
| From: | Withee C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Osgood N NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 9009260320 | |
| Download: ML20059L435 (1) | |
Text
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SEP 101990 f
i SGTB:CJW
- istr h tion:-
NSS r/h NRCtFCM 71-5641 il SGTB r/c *CWithee i
MEMORANDUM'FOR:~
Nancy L. Osgood, SGTB, NMSS i
'l FROM:
Carl J. Withee, SGTB,. NMSS-
.]
4
SUBJECT:
CRITICALITY REVIEW 0F 7/25/90 AND 8/20/90 APPLICATIONS FOR
. AMENDMENTS TO UNC-2500 SHIPPING PACKAGE CERTIFICATE 1
)
l I have reviewed the criticality analysis for the applications dated 7/25/90 and-0 8/20/90 to amend the allowed contents of the UNC-2500 shipping package. The 4
.two amendments are closely related and use the same criticality analysis method.
)
The. applicant used the KENO computer code to calculate the reactivity' of the~
pro)osed; content changes. The Hansen-Roach neutron cross section set was'used wit) one corrected cross section supplied by the Oak. Ridge Nationa'l Laboratory.
L To evaluate its computational method, the applicant compared a series of KEN 0 calculations-to the results from the analysis method used by the Knolls Atomic Power Lab 7(KAPL).
The KAPL method has previously been shown to have good
~ agreement.with independent NRC calculations. The comparison showed that the KENO method: produces conservative estimates of reactivity.
,s The applicant's criticality model assumed-full flooding and reflection, and,
contained twice the number of fuel assemblies to be shipped as Fissile Class III.
3 This model-bounded both the normal and accident condition cases.
A parametric analysis was made to determine the separation between assemblies which maximizes the reactivity.
- Results were reported for the contents requested except where a specific content
.was bounded by the parameters. of a more. reactive assembly type.
In all cases,
.the sum of k-eff plus two times the standard deviation of the statistical uncertainty was less.than 0.95.
To ' ass'ist.the NRC's ' review, tte' apilicant provided ' KEN 0 model data for three representative computer runs. The c ata were checked and found to be acceptably s
= conservative.-
4 l
' The^ applicant has shown that. the proposed contents will meet the criticality y
safety requirements of 10 CFR Part 71 and approval of both applicatio:;3 is.
I recommended.
S Carl J. Withee, SGTB, NMSS n /l p
\\
OFC: SGTB LW_/:
-NAME:CWithe/."...............................................................
e
'DATE:
9//7/90 :
0FFICIAL RECORD COPY l
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