ML20024D836
| ML20024D836 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/29/1983 |
| From: | SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| Shared Package | |
| ML20024D819 | List: |
| References | |
| TAC-52047, NUDOCS 8308080275 | |
| Download: ML20024D836 (2) | |
Text
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TECHNICAL SPECIFICATIONS Limiting Conditions for Operation -
B.
Both startup transformers 'shall be in service except that one will be
. sufficient if during the time one startup transformer is inoperable, a diesel generator is started and run continously.
C.
Both diesel generators shall be operable except that from and after the date that one of the diesel generators is made or found to be inoperable for any reasons, reactor oepration is permissible for the succeeding 15 days provided that during-such 15 days the operable diesel generator shall be load tested daily and both startup transformers are available.
If the diesel is not returned to service at the end of 15 days, the other diesel will be started and run with at least minimum load continously for an additional 15 days.
If at the end of the second 15 days the diesel is not returned to service, the reactor shall be brought to the cold shutdown condition within an additional 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
D.
If the plant is separated from the system while carrying its own auxiliaries, or if all 220 KV lines are lost, continued reactor operation is permissable provided that one emergency diesel generator shall be started and run continuously until a transmission line is restored.
E.
The essential nuclear service electrical buses, switchgear, load shedding, and automatic diesel start systems shall be operable except as provided in C above and as required for surveillance testing.
F.
Nuclear service batteries are charged and in service except that one.
nuclear service battery may be removed from service for not more than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
G.
Both nuclear service buses are operable except that one nuclear service bus may be removed from service for not more than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided that all equipment on the other nuclear service bus is operable.
H. ~ If ~the switchyard voitage goes below 218Kv, positive actions, within
[
the District's procedures, will be implemented in an attempt to return the voltage to 218Kv.
If the switchyard voltage goes below 216Kv or l
remains.below 218Kv for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, one electrical division will be operated 98 on its diesel generator independent of off-site power.
The other electrical division will be operated on off-site power with its associated diesel generator on standby status. The switchyard voltage must be returned to 218Kv within the next 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Switchyard voltage above 218Kv will allow unr.estricted plant operation.
7 3.7.3 If both diesel generators become inoperable, the unit shall be placed in the cold shutdown condition.
l No JS 3.7.4 The pressurizer sh'all be OPERABLE with at least 126 kw of pressurizer
'tn heaters. With the pressurizer inoperable due to inoperable emergency power supplies to the pressurizer heater either restore the inoperable y
emergency power supply within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUTDOWN within the following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
> c3 O
3.7.5 The voltage protection system trip setting shall be as stated in Table 3.7-1.
osa.a.
Proposed Amendment No. 98.
3-42
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e RANCHO SECO UNIT 1 TECHNICAL SPECIFICATIONS TABLE 3.7-1 VOLTAGE l'ROTECTION SYSTEM RELAY TRIP VALUES EQUIVALENT TIME DELAY UNDERVOLTAGE RELAYS 4160 BUS VOLTS (SECONDS) NOTES 2 & 3 (VOLTS)
Trip Set Point 3771 38 (Note 1) 98% of set point 3695 8.2 0.82 90% of set point 3394 5.2 0.52 70% of set point 2640 3.1 2 0.31 0% of set point 0
1.5 0.15 EQUIVALENT TIME DELAY OVERVOLTAGE RELAYS 4160 BUS VOLTS (SECONDS) NOTE 2 (VOLTS)
Trip Set Point 4580 46 102% of set point 4672 7.2 + 0. 72 NOTE 1 - The relay voltage values shown have been converted by the PT ratio (40:1) for review convenience.
NOTE 2 - For bus tripping an additional 0.5 time delay must be added.
NOTE 3 - The delay times shown are based on an initial bus voltage of 4160 volts.
Proposed 3-41a Amendment No. 98