ML19221A348
| ML19221A348 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/02/1979 |
| From: | Zigler G BABCOCK & WILCOX CO. |
| To: | |
| References | |
| NUDOCS 7905210318 | |
| Download: ML19221A348 (3) | |
Text
.r Noise Analysis Summary 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> April 2, 1979 No significant Loose Parts noises have been detected at the bottem and top of the reactor vessel and top and bottom of steam generators.
Primary Coolant pressure fluctuations have been observed with the following characteristics:
1)
Increase and decreases of reaccor - olant system pre sure p m d ce W noise were noted with normal operating increases and decreases in reactor coolant system pressure.
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- 2) The peak magnitude of the reactor coolant system pressure
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fluctuation increased in magnitude over a period of 18
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hours reaching a maximum typical value of 55 psig peak to-peak with the maxirum observed excursion of 137 psig peak-to peak for the Reactor Coolant Loop "A" pressure signal.
The typical peak to peak fluctuation for the Reactor Coolant Loop "B" pressure was 3 PSI and the maximum peak to peak value observed over a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> period was 8.5 psi peak-to peak.
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- 3) The typical peak to peak amplitude of the reactor coolant system pressure fluctuations has not increased in the last 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> [$[z,[q q h f 30 L) 4)
The onset of the pressere fluctuations appear s to occur at threshold value of the absolute value of the reactor coolant a
system pressure.
This onset pressure value has shown a slow decrease '.n titz.e and at 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> of 4/2/79 the threshold value was approxicately 850 psig.
- 5) After the pressure fluctuations have increased to the typical 55 psig peak to peak values, no further increase in the fluc-tuation magnitudes have been observed with increasing reactor coolant system pressure up to 1100 psig.
most of 6)
Spectral Analysis were performed and revealed that the pressure fluctuation amplitude power iA> essentially random fluctuations below 2 H: with low coherence between the pressure fluctuations of the two reactor coolant system loops.
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