ML19221A369

Forwards Task 30 Close Out Document Re Preliminary Prediction of Core Thermocouple Behavior During Natural Circulation

ML19221A369
Person / Time
Site:	Crane
Issue date:	04/23/1979
From:	Levy S INDUSTRY ADVISORY GROUP
To:
References
OSP-790423, TASK 30, TASK-30, NUDOCS 7905220076
Download: ML19221A369 (12)

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t PRELIMINARY PREDICT:0N OF CD;.E THEpM3r5UOLE EEHAVIOR DURING NATURAL CIR:ULAT10a S L*".A RY Past core thermocouple benavior has beer. reviewed to establish hcw the thermo-couples may behave during natural circulation.

It is expected that the highest U

rate of core thernocouale increase will be below 3C F/hr and that at most 12 thermoccuoles may reach saturation temperature or above.

Most thermocouples will remain wetted and will show temperatures Delow 250 to 300 F.

DISCUSSION There have been many reports written about the core thernocouples and the basis for some of the readings in excess of the reactor outlet temperature.

Tne most acceoted picture is that of fuel ; articulates beinc in proximity to the thermo-couples. The presence of fuel particles near the thermoccupies coupled with water flow havinc trouble reachinc the thermoccupies wculd explain the thermo-couple history cbserved since tne loss of feedwater accident.

It is postulated that during the early phases of cooldown, the fuel heat generation was high enough and tne flow to some inermoccuples low enough to L-oouce superheated steam at some of the thernoccuples. As the reactor poser decayed, some of tne thermo-couples were rewetted and this behavior is illustrated in Figures la and Ib where thermocouples at position G-ll, F-7, E-9, E-ll and E-9 and H-8 are all seen to c

exhibit a temperature drop of over 200 F/hr while falling below the saturation.

temperature.

The final temperature reacned by the thermocouples probably depended upon the flow reaching the thermocouple after it was reaetted.

The behavior of thermocoupies K-ll and D-10 is particularly interesting as they may exhibit rewetting and redryout es the saturation temperature was lowered.

It is also suspected that during this early phase of the decay, some fuel particles redistribution was taking place.

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One of tne ways to ascertair, that some o# the t.errocouples were cry cur.ng the early port of the accident is to look at tneir ber.avior as system pressure is modifiec.

If the thermocouples are blanketed with steam, a Dressure increase shc ld '.cwer the temperature and a pressure decrease should do the opposite.

This benasior is especially noticeable in Figure 2a where thermocouple H8 behavior is opposite to that of I on 4/8/79.

A similar pattern of thermocouple rising while Tsa. is oecreasing is observed in Figure 2D. A plot was made of the coverage of the five hottest thermoccuoles minus hot lec temperature as a function of time and it was comparec to pressure swines.

The -esults are shown in Figure 3.

It is observed that they cenerally corresponc thouch the change in the hottest thermo-couples is small indicating that steam or dry areas are very small at this stage of the cecay heat.

This is shown in Figure 4 wnere the five hottest temperature are clotted versus time versus outiet leg temperature.

The consistent behavio'-

of all these thermocouples inoicates that all core thermocouples are now oractic ally wetted.

Of particular interest curing the natural circulation run is the behavior of tr e core thermocouples.

The highest rate of decrease or increase was that already noted in Figures la and lb.

aking alicWance for cecay heat decrease, this 0

ma).imum rate of temperature chance would be 60 to 70 F/hr.

If we assume that rewetting and dryout are reversible temperature increases of 60 to 70 F may b3 indicative of local core thermocouple dryout. A more reasonable expectation of the temperature rise that might result is to look at Figure 5 when the pump trip took place.

In this case, thermocouple H-E which was primarily wetted started to rise sharply due to particulate end flow redistribution.

The rate of tenper-ature rise is about 70 F/hr and allowing for cecay heat reduction, this would U

correspond to about a 30 F/nr temaerature rise in late April.

It is suspected that during the switch to natural circulation, hottest core thermcouples can be espected to rise at the most at this rate.

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-3 During natural circulaticn, there are ne periocs of ve", great interest. During the transient af ter the pump is tripped, the ficw f alls below the natural circula-tion value (see for example FigJre 6). This flow Could Droduce st39 nation flow at some of the thermocouples and dryout of the fuel particulates around the thermo-couple. This period of zero to 800 seconds is especially critical. Thermocouples c should rise at 30 F/hr and as high as 70 F/hr if they be:o.e olanketed. The next period of interest is the behavior of the thermocouples at the much lower ficw rate of natural circulation. The total flow will cecrease by a factor of about 20 and if we assume that the thermocouple ter.aerature will rise accordirigly, it is found that at most 12 thermocouples may reach saturation tem?erature. This rate of rise will take place slowly as water flow drops through the particulates. It is expected that some redistribution will take place during this period of time, but that in general, the same number of high thermocouples will continue to exist. CONCLUSION 1. Most core thermocouples will rise gradually curing the transfer to naturai circulation and they should stop at 200 to 250 F. 2. A few thermocouples may be sub.iect to redistribution of flow and fuel particulates. Their temperature rise may be at most 30 F/hr. 3. Due to the reduced flow rate associated with natural circulation, a few thermocouples may reach saturation temperatures. This number is not expected to exceed 12. 4 During the initial stage of the transient close to stagnation flow may set in. Even under stagnation flow, the thermocouple temperature rise will be below U 70 F/hr and may be terminated as natural circulation sets in.

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