ML20098B129
| ML20098B129 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/19/1995 |
| From: | EQE ENGINEERING CONSULTANTS (FORMERLY EQE ENGINEERING |
| To: | |
| Shared Package | |
| ML20098B125 | List: |
| References | |
| TASK-A-46, TASK-OR 42105-R-002, 42105-R-002-R01, 42105-R-2, 42105-R-2-R1, NUDOCS 9510020236 | |
| Download: ML20098B129 (2) | |
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i 42105-R-002 Revision 1 Sept.19,1995 Page 3 of 84 i
TABLE OF REVISIONS Revision Descriotion of Revision Date Acoroved 0
Original issue May 11,1995 1
Revised last paragraph Sept.19,1995 of Section 2.2.3 Part 1, per GPUN Letter No.
C311-95-2361 l
9510020236 950927 PDR ADOCK 0500o289 P
42105-R-002
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Revision 1 Sept.19,1995 Page 30 of 84 i-MU-P-1B is normally operating to provide make-up and seal injection. The i
make-up pump (s) will initially take suction from the make-up tank. Suction will be switched to the borated water storage tank for additional water I
inventory as the make-up tank inventory is depleted. If make-up pump MU-P-l 1C is the only pump available, make-up without relying on local operator actions is from the borated water storage tank.
In addition to providing inventory control, the make-up system supplies water for seal injection, the preferred method of protecting reactor coolant pump (RCP) seals. If seal injection is not available from the make-up system, another acceptable method of maintaining seal integrity is by providing pump thermal barrier cooling from the intermediate cooling system which is l
identified as a supporting system needed to achieve the safe shutdown i
functions. Seal injection or thermal barrier cooling is required when RCS temperature is > 190 F, whether or not the RCPs are running, to prevent excessive leakage of reactor coolant from the seals.
The make-up pumps require a minimum recirculation flow to protect the pumps from overheating. The required minimum flow is normally provided by the motor operated recirculation valves MU V-36 and MU-V-37. These valves must be open when make-up pumps are operating. Flow from make-up pump MU-P-1C is not normally directed through seal injection of the normal make-up
- path, Recirculation flow is returned to the make-up tank. For the case where the d
BWST is used as a water source, the make-up tank will eventually fill from the recirculation flow. Sufficient time is available to prevent overfilling by l
manually returning pump suction to the make-up tank.
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- 2. Letdown for Inventory control The letdown capability will greatly simplify reactor inventory control. Manual j
control of enough components is possible to achieve and control letdown flow.
1 Sufficient time is available to line up the necessary components. The letdown d
.