ML19274F810

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Submits Recent Results of Calculation of Decay Heat for TMI-2.Calculations Use New Decay Heat Info as Supplied in Most Recent Draft of ANS Std 5.1
ML19274F810
Person / Time
Issue date: 05/09/1979
From: Richings H
Office of Nuclear Reactor Regulation
To: Kniel K
Office of Nuclear Reactor Regulation
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NUDOCS 7908060462
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{{#Wiki_filter:g ['* *'a uNircO srArss 1 4. NUCLEAR REGULATORY COTafalsslON j,j:;/y( } WASHINGTON, D. C 20555 %.WXfE g, %..... / MAY 9 1979 MEM]PANDUM FOR: Karl Kniel, Chief, Core Perforuance Branch, DSS THRU: Daniel B. Fieno, Leader, Reactor Physics Section, Core Performance Branch, DSS FROM: H. J. Richings, Reactor Physics Section, Core Performance Branch, DSS

SUBJECT:

DECAY HEAT FOR TMI-2 The enclosed figure gives the most r'ecent results of the calculation of decay heat for TMI-2 and should replace any values used in the It differs from previous calculations primarily in having an past. increased power operatin (period A in the figure)g history several months prior to the event This results in little change for the earlier shutdown times (several hours) but results in about a 5% increase at several days shutdown,10% at about a month and up to 30% at a year plus. The operating history model is based on the infomation (on boron follow) in the TMI-2 supplementary startup report (3-23-79), plus the assumption of constant 98% power for the last two weeks of operation based on verbal communication with TMI. The model is, of course, a simplification of the detailed history, but should represent integrated full power days with accuracy suitable for the calculation. The calculations (which are by hand) use the new decay heat infor-cation as supplied in the most recent draft of the ANS Standard 5.1 (September 1978). It uses this directly rather than as a correction factor as was done in previous calculations. The calculation used the infinite operation data for operation period D for shutdown times up to 107 seconds, and the pulse data for greater shutdown times and for all of operation periods A and B. The isotope power fractions and actinide production rate were esticated from general information. The isotope effect is small (a fe,v percent or less) and uncertainty in the estimate gauld have little effect. The actinide power contribution (from U23 2 and Np 39 decay) is significant, being as much as 24% at one day shutdown (about 15% at several hours and several days). But the uncertainty in its parameters should be small and thus the actinide contributicn to uncertainty should be no more than 1 or 2 percent. ?9080go g

MAY 9 1979 Mr. Kniel ' The overall uncertainty is estimated to be 5 to 10% (assuming no explicit error in the hand calculations). The uncertainty in the new ANS data, considering the isotope mix, is about 5% (2o). The remainder of the uncertainty is from inaccuracies in the operating history model and from estimates used in the hand calculations. These are probably biased in a positive direction. For example, the pulse time was taken as the center of the operating period, which should give a slightly too large result. There has been no corrections for the possible loss of " volatile" fission products from whatever region of the fuel or reactor system is of interest to the user of the decay heat information. There are regions and shutdown times for which this loss, depending on the temperature, damage, and loss models, could be significant. As a brief reminder of the potential for decay heat change, the following table is presented, giving percentage contributions to decay heat (total, including actinides) from fission products with boiling points less than temperatures which may have existed in TMI-2 fuel in the 1 to 15 hour tir.e frame. These values are estimates (taken from the work of England, Schenter and Scmittroth) to illustrate magnitudes involved with the more prominent " low" boiling point contributors. % Contribution to Total Decay Heat Shutdown Time Isotopes B.p. (*F) sl hr sl day s2 wk s4 mo s3 yr Noble Gases 4 2 1 Halogens 22 14 5 (Te) (1800) Cs (137) 1300 3 Sr (89,90) 2500 3 7 8 4 Ba (137,140) 3000 4 6 12 La (140) 18 35 1 Note that the use of such values requires considerable ir.terpretation and modeling for the specific case. For example, these are members of cecay chains and may have benri some other element at the time of n .._--e~- ~ - -

MAY 9 1919 Mr. Kniel l40 140 hightgerature. As an example La comes primarily from Ba l40 has a 2 day h g life, Ba a 13 day half life. At The La the La contribution comes mostly from atoms one day shutdg during the high temperature regime and therefore which were La not volatile. At two weeks shutdown, however, the Lal40 comes mostly from atoms which were Ba140 during high temperature, and which may in some cases have been " volatile". Similarly, some of the iodine contribution comes from atoms which were tellurium during high temperatures. // M/ / 7 H. J. Richings Reactor Physics Section Core Performance Branch, DSS cc: R. Mattson F. Schroeder R. Tedesco R. Meyer J. Voglewede CPB Physics Section T. tiovak S. Israel G. Mazetis C. Graves Z. Rosztoczy P. fiorian L. Phillips G. Holahan N. Lauben B. Sheron V. S tello D. Davis T. Telford S. Weiss ~ C. Berlinger R. Wood D. Crutchfield m g-

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