ML19221A624

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Task 10B:Fuel Temp Thermocouple Readings During Pressure Transients from 790409-12
ML19221A624
Person / Time
Site: Crane Constellation icon.png
Issue date: 04/13/1979
From: Kolar M
INDUSTRY ADVISORY GROUP
To:
References
OLP-790413, TASK 10B, TASK-10B, NUDOCS 7905230462
Download: ML19221A624 (7)
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Members of Ccmittee U l-s? t lWf H g/ Signed 0.Arnphel-.L cccnittee Leader s

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S. LEVY 4-12-79/2 Q

FROM:

CAMPBELL & KOLAR

SUBJECT:

FUEL TEMPERATURE THEIN0 COUPLE READINGS DURING PRESSURE TRANSIENTS FROM 4/9/79 TO 4/12/79 CONCLUSION

.There is no evidence that core temperatures exceeded Tsat during the subject period.

BACKGROUND The fuel temperature themocouples were originally located at the top of the core inside sealed cylindrical vertical tube:.

Each tube also contains seven neutron-detectors and is packed with aluminum oxide.

The tubes enter the core from below so that the themocouple junctions were originally at the top of the tube. The following discussion is based on the assumption that the tubes and themoccuple junctions are still in the same location where they were originally

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installed.

The system pressure is measured at t tap near the top of the hot leg (just before it turns to enter the steam generater).

It is assumed that pressure readings

-J were reasonable throughout the period in question.

Since there is a considerable height difference between the top of the core and the locatien of the pressure tap, the static pressure at the TC position is higher than that at the pressure tap. Since relatively small velocities are likely at the TC location, we would expect the total pressure (static and dynamic) to be higher at the TC than at the tap. The saturation temperature increases with increasing pressure. Therefore, the saturation temperature at the themoccuple is agtually higher than Tsat given below.

We estimate the difference at about 4 F.

4 The attached graph shows the system pressure and the temperatures of the six hot-test TC's for the subject pegiod.

The lowest pressure was 312 psig; this corresponds to a Tsat of 426 F.

Since this pgessure corresponded to the highest temperature reading of the entire period (400 F)g we conclude that the closest approach to Tsat occurred at this point, i.e. 26 F.

Obviously, the fuel temperature is higher than the T/C reading. We were informed verbally that there were no changes in the readings of the two source BF3 neutron detection channels during the period of largest pressure reduction.

(Noon on 4/11/79 to 6 a.m. on 4/12/79)

We conclude that there is no evidence of gross boiling.

U 166 060

/

/

/

/

. FUEL TEMPERATURE THERM 0 COUPLE Page 2

/

READINGS DURING PRESSURE TRANSIENTS.

Q FROM 4/9/79 TO 4/12/.79 The temperature and pressure readings shown on the attached graphs were taken at one hour intervals using the plant computer.

It does not appear that there was continuous recording of any temperatures.

However, two T/C's (not among i,,

those shown on the attached graph) were being monitored continuously for AC vol tage. The signal from one' of these T/C's showed no change throughout tee trantient. However, the second T/C showed a factor of two change in amplitude when the pressure reached its minimum point. This new amplitude continued to

.be displayed throughout the ramp up in pressure. We do not believe this was associated with the T/C itself.

We do not have an explanation for this phenomenon at this time.

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