B13552, Proposed Tech Specs Re Feedwater Coolant Injection Sys Surveillance Testing
| ML20043H773 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/18/1990 |
| From: | NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML20043H766 | List: |
| References | |
| B13552, NUDOCS 9006260429 | |
| Download: ML20043H773 (3) | |
Text
.
b Docket No. 50-245' 4
B13552
-i t
t i
e Millstone Nuclear Power Station, Unit No. 1 Proposed Revision to Technical Specifications Feedwater Coolant Injection System Surveillance Testing i
i June 1990 9006260429 900618 PDR ADOCK 05000245
/
p PDC
/
.,g fLIMITINGCONDITIONFOROPERATION 3.5 -CORE AND CONTAINMENT COOLING SYSTEMS C.
FWCI Subsystem 1.
Except as specified in 3.5.C.5 below, the FWCI subsystem shall be l
operable whenever the reactor coolant temperature is greater than 330'F and irradiated fuel is in the reactor vessel.
l 2.
The trip on high Gas Turbine Exhaust. Tem)erature of the 14A to 14G
-l tie breaker shall be operable whenever tie Gas Turbine is operable J
and FWCl is capable of auto initiation of the Reactor Feedwater Pumps.
3.
There shall be a minimum of 250,000 gallons of useable water in the f
l condensate storage tank for operation of the FWCI.
j 4.
From and after the date that the 14A to 14G tie breaker trip on Gas Turbine High Exhaust Temperature is found to be inoperable, the FWCI selected feedwater pump auto start shall be inhibited from its emergency power source or the Gas Turbine Generator shall be declared inoperable. _
5.
From and after the date that the FWCI subsystem is made or found to 1
be inoperable for any reason, reactor operation is permissible only during the succeeding seven days, unless such subsystem is sooner i
made operable, )rovided that during such seven days all active components of tie Automatic Pressura Relief Subsystem, the core f
spray subsystems, LPCI subsystem, and isolation condenser system are 1
-l 6.
If the requirements of 3.5.C cannot be met, an orderly shutdown
[
shall be initiated and the reactor coolant temperature shall be less
]
than 330'F within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
[URVEILLANCEREQUIREMENT 1
4.5 CORE AND CONTAINMENT COOLING SYSTEMS C.
Surveillance of FWCl Subsystems shall be performed as follows:
1 1.
J1em Frecuency a.
Pump and valve Per Surveillance operability Requirement 4.13 b.
Simulated Automatic Every refueling i
Actuation Test outage c.
14A to 14G Tie Every refueling Test Trip outage.
2.
Once a week the quantity of water in the condensate storage tank shall be logged.
Millstone Unit 1 3/4 5-5 Amendment No. J, JE
i
+
v,.
3.5 CORE AND CONTAINMENT COOLING SYSTEMS BASES Should one cote spray subsystem become inoperable, the remaining core spray and the entire LPCI system are= available should the need for core cooling arise.
Should the los s of one LPCI pump occur, a nearly full complement of _ core 1
and containment cooling equipment is available.
Three LPCI pumps in conjunction with one core spray subsystem will perform the core cooling
~
function.
Btcause of the availability of the majority of the core cooling equipment, which will be demonstrated to be operable, a 30-day re) air i
period is justified.
If more than one LPCI pump is inoperable, tie repair 1
time is set'considering the containment cooling function of the LPCI pumps.
B.
fantainment Coolina Subsystems The two containment subsystems are provided to remove heat energy from the j
containment in the event of a loss-of-coolant accident.
Each single containmentcoolingsubsysteminclugestwoservicewaterpumps, associated valves, one heat exchanger (40 x 10 BTU /hr), two LPCI pumps and necessary instrumentation, control and power equipment. With two heat exchangers (i.e., both loops) operable, it is possible to degrade system performance to one LPCI and one service water pump operating per loop and still not exceed significantly the equipment design temperatures and not rely completely on containment pressure for net positive suction head.(NPSH).
An interlock to prevent containment spray actuation is included in the design of engineered safety features to prevent inadvertent pressure reduction below that required for NPSH.
The heat removal capacity of a single cooling' loop is adequate to prevent the torus water temperature from exceeding the equipment temperature capability which is specified to be 203'F..
It also provides sufficient subcooling so that adequate NPSH could be assured without reliance on containment pressure except for short intervals during the postulated accident.
In the event that only one heat removal' loop is operable, station operation will be permitted for four days unless necessary repairs are made to make the other loop operable. A
' four-day period is selected to permit reasonable time for operator' action and maintennce operations.
C.-
Feedwater Coolant In.iection Subsystem The feedwater coolant injection subsystem is provided to adequately cool the core for all pipe breaks smaller than those for which the LPCI or core spray-subsystems can protect the core.
The FWCI meets this l
requirement without the use of off-site electrical power. The 14A to 14G tie breaker trip protects the Gas Turbine Generator from being overloaded during a design basis event.
For the pipe breaks for which the FWCI is intended to function, the core never uncovers and is continuously cooled, thus no clad damage occurs.
The repair times for the limiting conditions of operation were set considering the use of the FWCI as part of the emergency core cooling system and isolation cooling system.
Millstone Unit 1 B 3/4 5-2
.