ML19224A808
| ML19224A808 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/14/1979 |
| From: | Marotta C Office of Nuclear Material Safety and Safeguards |
| To: | Kniel K, Macdonald C Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19224A809 | List: |
| References | |
| FOIA-80-301 NUDOCS 7905300433 | |
| Download: ML19224A808 (1) | |
Text
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fCKET(53-20)
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MAY 14 ;g79 Distribution:
C W omald fiSMarottaD Central Files NMSS R/F rCTR R/F REF.0RAf!DUM FOR: Karl Kniel, Chief Core Performance Branch, DSS Office of tiuclear Reactor Regulation i
THRU:
Charles E. MacDonald, Chief l
Transportation Branch Division of Fuel Cycle and Paterial Safety, ii. MSS FROM:
Charles R. Marotta, Senior Criticality and Shielding Engineer Transpcrtation Branch, FC, !GISS SU3 JECT:
RECRITICALITY POTEliTIAL OF T! I-2 CORE 3
i A nuder of KE30 !! ante Carlo analyses were undertaken to establish j
the potential of a recriticality in the TMI-2 core.
It appears that
'i 3500 ppa natural baron uniformly distributed and caintained in the riderator/ coolant will guarantee suberiticality for all credible l
possible abnormal states of the core.
The extrece assumption of j
complete loss of all r.ovable control rods ar.d all fixed burnable poisons was a condition for all the calculations.
I The study indicates alsc that the highest enriched peripheral region J.
of the cora is controlling for criticality when accidental boron (hide out) dilution occurs.
1 i
It is also noted that regardless of the baron ccncentraticn in the l
coolant, if a loc. 'ized 2 percent volu. e of the core (4 fuel assemblies in square gecnetric contact) receives unborated water for the full-l length of the active core, criticality will be achieved.
I' The method of analysi.s, results, and pertinent da'ta are enclosed.
M/
168 155 -
,aI Charles R. !trotta, Senior Criticality l
and Shielding Engineer i
Transportation Branch Divisica of Fuel Cycle and Material Safety Office of !!uclear ftaterial Safety and Safeguards
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Enclosures:
As stated 1905300V33
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