ML20248K371
| ML20248K371 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 04/05/1989 |
| From: | SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | |
| Shared Package | |
| ML20248K369 | List: |
| References | |
| NUDOCS 8904170315 | |
| Download: ML20248K371 (2) | |
Text
_ __. - _ _
' ELECTRICAL POWER SYSTEMS a.
~
A.C. SOURCES SHUTDOWN LIMITING CONDITION FOR OPERATION-3.8.1.2 As a minimum, the following A.C. electrical power sources shall be OPERABLE:'
2 a.
0ne circuit between the offsite transmission network and the onsite Class 1E distribution system, and.
b.
One diesel generator
- with:
j 1.
-A day tank conta'ining a minimum volume'of 300 gallons.of; fuel,.
2.
A fuel storage. system containing a minimum volume of 30,000
-j gallons of fuel, and 3.
A fuel transfer pump.
4 APPLICABILITY: MODES 5 and 6.
. ACTION:
With'less than the above minimum required A.C. electrical power sources OPERABLE, immediately. suspend'all operations involving: CORE ALTERATIONS,
. positive reactivity changes, movement of irradiated fuel,.or crane operation with loads over the fuel storage pool.
In addition..when in MODE.5 with the; Reactor Coolant loops not filled, or in MODE 6 with the water level less than' 23 feet above the reactor vessel flange, immediately initiate corrective action to restore the required sources to OPERABLE status as soon as possible.
SURVEILLANCE REQUIREMENTS 4,8.1.2 The'above required A.C. electrical power. sources shall be demonstrated OPERABLE by the performance of each of the Surveillance J
Requirements of 4.8.1.1.1, 4.8.1.1.2 (with the exception of 4.8.1.1.2.a.4)
'and 4.8.1.1.3.
- ESF Load Sequencer may be deenergized in Mode 5 and 6 provided that the loss of voltage and degraded voltage relays are disabled.
i s
e l
SUMER ' UNIT - 1 3/4 8-9
~
l
y y
' ATTACHMENT NO SIGNIFICANT HAZARDS DETERMINATION 1
Based on the following evaluation, SCE&G has determined the proposed change" does not involve a significant hazards consideration.
1)l Does the proposed change involve a significant increase in the probability or
. consequences of an accident previously evaluated? NO l
The present Technical Specifications does not require the various sequencer
. actuation signals to be operable in Modes 5 and 6. The defeat of the loss of voltage and degraded voltage relays in conjunction with the sequencer being inoperable will prevent a potentialinadvertant overload of the unit and require the operator to manually control loading of the unit. A conservative engineering evaluation has shown that there is adequate time for manual i
operator action. This change will decrease the probability of a diesel failure and I
enhance the operators' capability to respond to a loss of power in Modes 5 and
]
6.
- 2) Does the proposed change create the possibility of a new or different kind of.
accident from any accident previously evaluated? NO The proposed amendment does not create the possibility of a new kind of accident from any accident previously evaluated because the design and function of the diesel generator will not change. Starting and loading of the diesel generator will be manually controlled to reduce the possibility of overloading the unit.
- 3) Does the proposed change involve a significant reduction in a margin of safety?
NO
.The' pro osed amendment does not involve a significant reduction in the margin of safet because there will be no change in response times or emergency loads assume in the accident analysis for Modes 5 and 6.
l l
1 i
i
.