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Enclosure 3 (to 01-31-06 Ltr) - 04-29-79 Examination of Reasons for Temp Rise in TC 9H TMI
	ML060330057
Person / Time
Site:	Three Mile Island
Issue date:	04/29/1979
From:	Buhl A, Stroupe W; - No Known Affiliation
To:	Levenson M, Levy S, Zebroski E; Office of Nuclear Reactor Regulation
Shared Package
ML060230218	List: ML060200058; ML060200059; ML060250281; ML060250286; ML060250288; ML060270341; ML060320530; ML060330052; ML060330055; ML060330057; ML060540057; ML060550444; ML061460509;
References
	NUDOCS 7908220063
	Download: ML060330057 (8)
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TO: S. Levy FROM: Buhl and Stroupe

SUBJECT:

Temperature Increase in TC 9O on 4/29 and 4/30

==

Conclusion:==

The temperature indicated by TC 9H is correlated to changes in pressure and not t:o other plant parameters. As pressure decreases the temperature indicated by TC 9H increases. This suggests a small boiling hot spot somewhere in the vicinity of TC 9H. Noise tests do not indicate boiling which says that boiling is not substantial nor located in the immediate vicinity of any of the TC's.

Pecoumendation: Continue to monitor TC 9H with all other TC's. When pressure increases the temperature indicated by TC 9H should stabilize or decrease. When pressure is reduced substantially TC 91H will increase and the surrounding TC's can be monitored to determine if boilinc area is increasinc. Also noise on the TC's snould be monitored to pick up vioorous boiiinS.

Several plant parameters were examined to determine the reasons for TC 9H temperature increases on 4/25 and 4/30/79. The system pressure and the 6 hottest TC's are plotted on Ficure 1 from 4/2C through 5/1. The correlation of TC 9H tem=eratu.-es and system pressure is evident as noted in the upper right corner of Figure 1.

Other plant parameters are plotted on Figure 2 and no czrrelations are apparent.

These data suggest that a small hot spot may exist somewhere below TC 9H which produces some boiling. If so, boiling is not vigorous and does not extend to other TC's. Noise analysis of the TC's dlid not locate boiling which says that if boiling is occurring it is limited and below the threshold of noise detection. Further, since no other TC's are showing increasing temperatures, the hot spot is small enough as to not affect adjacent TC's.

The correlation of TCreadings with pressure for the hottest TC's was apparent in early April. Figures 3 and 4 were taken from 1AG Task Report #30 dated 4/23/79 and on IAG meno Kolar to Lieb dated 4/27/79 respectively. These data show the same correlation with pressure.

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ML060330057

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