ML13317B099
| ML13317B099 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/19/1982 |
| From: | Southern California Edison Co |
| To: | |
| Shared Package | |
| ML13317B098 | List: |
| References | |
| NUDOCS 8204220405 | |
| Download: ML13317B099 (8) | |
Text
ENCLOSURE 2 DRAFT TECHNICAL SPECIFICATIONS FOR UNDERVOLTAGE PROTECTION SCHEME SAN ONOFRE UNIT 1 8204220405 820419,
PDR ADOCK 05ooo220o
3.5.8 Undervoltage Protection Instrumentation Applicability:
Applies to the undervoltage protection relays shown in Table 3.5.8-1.
Objective:
To ensure reliability of undervoltage relays for loss of power and degraded voltage protection.
Specification: A. The undervoltage instrumentation channels shown in Table 3.5.8-1 shall be OPERABLE with their trip setpoints set consistent with the Trip Setpoint column of Table 3.5.8-2.
B. With an instrumentation channel trip setpoint less conservative than the value shown in the Allowable Values column of Table 3.5.8-2, declare the channel inoperable and apply the applicable ACTION requirement of Table 3.5.8-1 until the channel is restored to OPERABLE status with the trip setpoint adjusted consistent with the Trip Setpoint Value.
C. With one instrumentation channel inoperable, take ACTION X of Table 3.5.8-1.
D. With more than one channel inoperable, take ACTION Y of Table 3.5.8-1.
Basis:
The OPERABILITY of the undervoltage protection instrumentation ensures that (1) electrical equipment will not be damaged due to a sustained degraded voltage condition on the 4kV buses, (2) the diesel generators will start in the event of a loss of offsite power or sustained degraded voltage condition and, (3) the safety injection system loads will be started on-the diesel generator's in the event of a safety injection signal coincident with a loss of offsite power or sustained degraded voltage condition.
Table 3.5.8-1 Undervoltage Protection Instrumentation Minimum Total No.
Channels Channels Applicable Functional Unit of Channels To Trip Operable Modes Action a) Loss of Power-CV7 3
2 2
1, 2, 3 X, Y b) Degraded Voltage-CV6 3
2 2
1, 2, 3 X, Y c) Degraded Voltage-SV 3
2 2
1, 2, 3 X, Y ACTION X - With the number of OPERABLE channels one less than the Total Number of Channels, operation may proceed until performance of the next required CHANNEL TEST provided the inoperable channel is placed in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
ACTION Y - With more than one channel inoperable, an operator shall assume continuous surveillance and actuate manual initiation of the undervoltage relays, if necessary. Restore the system to no more than one Channel inoperable within 7 days, or be in HOT STANDBY within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
Table 3.5.8-2 Undervoltage Protection Instrumentation Trip Setpoints Functional Unit Trip Setpoint Allowable Value a)
Loss of Power-CV7 See Figure 3.5.8-1*
See Figure 3.5.8-1*
b) Degraded Voltage-CV6 See Figure 3.5.8-2*
See Figure 3.5.8-2*
c)
Degraded Voltage-SV 3952 volts 3952 + 39 volts
- Inverse time relay; trip will occur within the tolerance specifed in Figures 3.5.8-1 and 3.5.8-2 for the range of bus voltages.
4.1.9 Undervoltage Proctection Instrumentation Objective:
To ensure reliability of undervoltage relays for loss of power and degraded voltage protection.
Applicability:
Applies to the undervoltage protection relays shown in Table 4.1.9-1.
Specification: A.
Each instrument channel shall be demonstarated OPERABLE by the performance of the CHANNEL CHECK, CHANNEL CALIBRATION, and CHANNEL TEST operations for the MODES and at the frequencies shown in Table 4.1.9-1.
Basis:
The surveillance requirements specified for this instrumentation ensure that the functional capability of the undervoltage protection system is maintained comparable to the original design standards.
Table 4.1.9-1 Undervoltage Protection Instrumentation Surveillance Requirements Modes in Which Channel Channel Channel Surveillance Functional Unit Check Calibration Test Required a) Loss of Power-CV7 S
R M
1, 2, 3 b) Degraded Voltage-CV6 S
R M
1, 2, 3 c) Degraded Voltage-SV S
R M
1, 2, 3
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