ML20113E364
| ML20113E364 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 04/10/1985 |
| From: | WISCONSIN ELECTRIC POWER CO. |
| To: | |
| Shared Package | |
| ML20113E359 | List: |
| References | |
| TAC-57555, TAC-57556, NUDOCS 8504160263 | |
| Download: ML20113E364 (3) | |
Text
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o 15.3 LIMITING CONDITIONS FOR OPERATION 15.3.1 REACTOR COOLANT SYSTEM Applicability' Applies to the operating status of the Reactor Coolant System.
Objective To specify those limitng conditions for operation of the Reactor Coolant System which must be met to ensure safe reactor operation.
Specification A.
OPERATIONAL COMPONENTS 1.
Coolant Pumps
- a.
When the reactor is critical, except for tests, at least one reactor coolant pump shall be in operation.
(1) Reactor power shall not be maintained above 10% of rated power unless both reactor coolant pumps are in operation.
(2)
If either reactor coolant pump ceases operating, immediate power reduction shall be initiated under administrative control as necessary to reduce power to less than 10% of rated power.
(3) If both reactor coolant pumps cease operating, the reactor shall be shut down and the reactor trip breakers opened within one hour.
b.
When the reactor is suberitical and the average reactor coolant temperature is greater than 350 F, except for tests, at least one reactor coolant pump shall be in operation.
Both reactor coolant pumps may be deenergized provided no operations are s
permitted that would cause dilution of the reactor coolant system boron concentration, core outlet temperature is maintained at least 10 F below saturation temperature, and the reactor trip breakers are open.
c.
At least one reactor coolant pump or residual heat removal system shall be in operation when a reduction is made in the boron con-i l
centration of the reactor coolant.
2.
- a.
One steam generator shall be operable whenever the average reactor I
coolant temperature is above 350'F.
3.
Components Pequired for Redundant Decay Heat Removal Capability
- a.
Reactor Coolant temperature less than 350*F and greater than 140*F.
(1) At least two of the decay heat removal methods listed shall be operable.
l (a) Reactor Coolant Loop A, its associated steam generator and either reactor coolant pump I
(b) Reactor Coolant Loop B, its associated steam generator and either reactor coolant pump
- Applicable only when one or more fuel assemblies are in the reactor vessel.
8504160263 h h 66 I
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5.
Pressurizer Power-Operated Relief Valves (PORV) and PORV Block Valves a.
Two PORVs and their associated block valves shall be operable.
(1) If a PORV is inoperable due to leakage in excess of that allowed in Specification 15.3.1.D. the PORV shall be restored to an operable condition within one hour or the associated block valve shall be closed.
(2)
If a PORV is inoperable due to a channel functional test failure, the associated PORV control switch shall be placed and maintained in the closed position or the associated block valve shall be closed within one hour.
(3)
If a PORV block valve is inoperable, the block valve shall be restored to an operable condition within one hour or the block valve shall be closed with power removed from the block valve; otherwise, the unit shall be in hot shutdown within the next six hours.
6.
The pressurizer shall be operable with at least 100 KW of pressurizer heaters available and a water level greater than 10% and less than 95%
during steady-state power operation. At least one bank of pressurizer heaters shall be supplied by an emergency bus power supply.
Basis When the boron concentration of the Reactor Coolant Sytsem is to be reduced, the process must be uniform to prevent sudden reactivity changes in the reactor.
Mixing of the Reactor Coolant will be sufficient to maintain a uniform boron concentration if at least one Reactor Coolant Pump or one residual heat removal pump is running while the change is taking place. The residual heat removal pump will circulate the primary system volume in approximately one-half hour.
The pressurizer is of little concern because of the lower pressurizer volume and because pressurizer boron concentration normally will be higher than that of the rest of the Reactor Coolant.
i Specification 15.3.1.A.1 requires that at least one reactor coolant pump must be operating whenever the average reactor coolant temperature is above 350 F unless the listed restrictions are established. This is required so that the FSAR zero power transients (rod withdrawal from suberitical and rod ejection) are addressed from conservative conditions. With the reactor suberitical, with required shut-15.3.1-3
's,'
d down margin, and with the trip breakers open, a single rod ejection will not result in criticality being reached.
With the reactor suberitical and the average reactor coolant temperature above 350 F, a single reactor coolant pump provides sufficient decay heat removal capability. lieat transfer analyses ( ) show that reactor heat equivalent to 10% of the rated power can be removed with natural circulation only; hence operation up to 10% of rated power with a single reactor coolant pump in operation provides a sufficient safety factor.
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l l
l 3
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l 15.3.1-3a