ML19224C013
| ML19224C013 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/07/1979 |
| From: | Wilson R GENERAL PUBLIC UTILITIES CORP. |
| To: | Kunder G GENERAL PUBLIC UTILITIES CORP. |
| References | |
| TSG-144, NUDOCS 7906280170 | |
| Download: ML19224C013 (3) | |
Text
Enter-UTTICS IMemOrandurn nn 1.,a/a s.1 ;
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Recommended Cnanges in T:C - 2
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Operating Point i
George Kunder toca ~ Three Mile Island ference.
Gpu Memo to G.
Kunder from R.
F.
Wilson, same subject, dated May 1, 1979 The.ollowing recommendations are revisions / additions to the r e co:=e n d a tio n s given in the referenced memo.
They replace or modify Steps 1 through 5 in the reference.
1.
Completed per the referance.
2.
The A steam generator bypass valve is now at the 84% cpen position.
With the present method of draining the main steam line low point drain (direct temporary connection to the condenser), no further reduction r bypass valve position is required at this time.
The temporary drain should be opened once per day to remove condensate from the line.
A future memo will provide lanc term recommendations on the steam genera tor A bypass valve position to maintain current steam temperature.
3.
Open and tag out the circuit breakers for all four reactor coolant pumps.
This is intended to prevent inadvertent restart of the pumps.
This step should be performed as soon as possible.
/..
' ter successful completion of the above, secure the i..ermediate closed cooling water system.
No change in primary coolant temperatures or steam temperature should be observed.
Monitor for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> before proceeding.
5.
After successful completion of Step 4, close valve NS-V67 to stop cooling water flow to the Seal Return Coolers.
The tempera-ture in the makeup tank is to be raised to a value not to exceed 1500F.
If necessary, NS-V67 can be re-opened periodically to maintain temoerature at 1500F.
As makeup temperature is raised, monitor for F hours the temperature of the E cold loop.
No change in ccid loop temperature should be detected.
6.
After makeup tank temperature has been stable for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, benchmark pressurizer level by taking the pressurizer solid per Z-63, then redraw the bubble per 2-63.
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Paae Two 7
After pressurizer level is stable, gracuall3 reduce RCS pressure to 500 1 50 psig as follows.
a Take pressure reductions in steps of 100 ps1 by reducing pressurieer heater power.
(It is desirable to turn all heaters comoletelv without heaters.. off to chec} deoressurination rate See Item g.
below.)
Complete each step.
by stabilizing pressure.
The total step time should be a minimum of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
b.
Monitor all incore thermocouples and plot the hot and cold s i: every 30 minutes.
Plot each loop Tg, T T
and RCS C'
ST:.:
pressure (lowest instrument) every 30 minutes.
c.
Cattinue to estimate pressurizer level by EP-21.
d.
The Noise Analysis Team should be alerted during each oressure reduction to monitor for local noiling or other changes in system signatureb.
e.
Prior to proceeding to the next pressure step, check with the ::Oise Analysis Team to see thr conditions are stable (less thar 100 peak / peak TC-9H).
Review the plots of RCS parameters (7b.) to insure they are stable.
Evaluate any anomoly prior to proceeding.
f.
Precautions for monitoring letdown flow will be supplied later.
g.
Complete attached data sheet for rate cf pressure decrease.
8.
After Item 7, monitor the reactor system stability for several days.
During this period, benchmark pressurizer level per procedure 2-63, with approval of J.Herbein.
On the 1st benchmarking per procedure 2-63, hold the pressurizer solid for approximately 2 days or until an accurate primary sjucem leak rate in the solid mode is obtained.
After obtaininc the data, reGraw the bubble
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per procedure 2-63.
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Arnold J.
Herbein J.
DeVine B.
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- 4 Estimated Pressure Level Time (asia)
(Inches)
Beginnine'*)
of first tressurc reduction Nic-rcin of first cre.sure recuetion Endt-i of rirst pressure reduction-Beginning of second pressure reduction.
Mid-point of second pressure reduction.
End of second pressure reduction.
Beginnine of third pressure reduction.
Mid-point of third pressure reduction.
End of third pressure reduction.
Beginning of fourth pressure reduction.
Mid-point of fourth pressure. eduction, End of fourth pressure reduction.
(1) '. t the time pressurizer heaters turned of f.
(2) At the time pressurizer heaters turned on.
258 038