ML19221A356
| ML19221A356 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/02/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| NUDOCS 7905210329 | |
| Download: ML19221A356 (3) | |
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p No significant Loose Parts noises have been detected at the bottom and top of tha raactor vassel and top and bottom of steam generators.
Primary Coo. ant pressure fluctuations have been observed with the following characteristics:
1)
Increase and decreases of reactor coolant system pressure y-t/~Cti &
noise were noted with norma 7 operating increases and 1
decreases in reactor coolant system pressure.
2)
The peak magnitude of the reactor coolant system pressure fluctuacion increased in magnitude over a period of 18 -
y; 3.;.44 h sg rd 3 L r qWj hours' reaching a maximum typical value of 55 psig peak-to-peak with the maxi =um 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-tc peak.
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- 3) The typical peak to peak amplitude of the reactor coolant M'
system pressure fluctuations has not increased in the last =Mz d
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~C?p 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />)
- 4) The onset of the pressure fluctuations appears to occur at a threshold value of the absolute value of the reactor coolan'b '~
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system pressure.
This onset pressure value has shown a slow" decrease in tine' 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 val,ue was approximately 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.
6) spectral Analysis were performed and revealed that mcst of the pressure fluctuation amplitude power in essentially 4 Q %ww W ^J + l JL W O -1 1 t
random fluctuations Q Hz with low concrence between y
the pressure fluctuations of the two reactor coolant system loops.
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