ML19224C175
| ML19224C175 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/10/1979 |
| From: | Wilson R GENERAL PUBLIC UTILITIES CORP. |
| To: | Arnold R GENERAL PUBLIC UTILITIES CORP. |
| References | |
| NUDOCS 7906290274 | |
| Download: ML19224C175 (3) | |
Text
,
Inter-Office Memorandum L'
L/,<
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a9 May 10, 1979 i
P-L RJ berViCO c
dah 1
Lc Long Term Reacter Coolant System Pressure Control 70 R.
C. Arnold
- C' -
Three Mile Island The current plan is to take the reactor primary system down to a pressure of approximately 300 psi for long term (2 - 4 + months) natural circulation.
This pressure is prefetred since it does not cause additional gas _to be re- --
~~~- drawn from the control rod drives and provides ample margin on incore thermo-
~
~~
couple T In all probability, the reactor coolant system temperature will sat.
also be held at its approximately current value by periodic throttling of the condenser bypass valve.
During the 2 - 4 or more months that the reactor is expected to be on natural circulation cooling, there are five potential options for pressure control.
These include:
1.
Use of the pressurizer with a normal vapor bubble.
2.
Taking the plant solid and controlling through maktop and letdown.
3.
The new pressure volume control system.
4.
Floating the plant on core flood tanks.
S.
Floating the plant on the low pressure injection pump discharge.
The sixth aption, letting the system pressure drop to atmospheric, is not viable in the near term.
The attached table summarizes some of the pros and cons of the various alternatives.
It is recommended that pressure control be maintained through normal pressurizer heating with a vapor bubble.
This recommendation assumes that current efforts to retain / rector: Seaters will be successful, that solid operation will not show a marked change in system leak rate and that system makeup and letdown can ba secured af ter periodically taking the pressurizer solid and letting the sy-eem drift down on leakage.
On going solid, P;r level can be obviously benchmarked.
In the event that unforeseen problems or other restrictions prohibit operating tae pressurizer in the normal mode, it is recommended that the first fallback position be to take the plant solid and maintain pressure through normal makeup and letdown (assuming valves. pumps, etc. permit). The second fallback position a"7
'T "
{D) l'.I OSo gt t
No GPU Servoce Corporation c a sutse ary of Genera! Puchc UUit.es Corcoranon
Long Term Reactor Cociant System Pressure Page Two should be use of the new pressure volume control system.
Floating of the core flood tanks or the low pressure injection pumps should bc considered as further fallback positions, although neither of these systems appear to be technically unacceptable.
R.
- i. Wilson RFW/al ATT cc:
J.
G. Herbein L.
Pletke - 35W E. G. Wallace D. Vollmer - NRC J. P. Moore M.
P. Morrell S.
D.
Elas G. Kulynych - B&W 3
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