ML20203E405

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Proposed Tech Specs Re DG Surveillance Requirements
ML20203E405
Person / Time
Site: Millstone Dominion icon.png
Issue date: 02/11/1999
From:
NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20203E392 List:
References
NUDOCS 9902170183
Download: ML20203E405 (6)
v • d • e


Text

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. ELECTRICAL POWER SYSTEMS ACTION (Continued) l Inoperable Equipment Required Action i l

e. Two diesel generators e.1 Perform Surveillance Requirement 4.8.1.1.1 for the offsite circuits within I hour and at least once per 51 hours5.902778e-4 days <br />0.0142 hours <br />8.43254e-5 weeks <br />1.94055e-5 months <br /> thereafter.

AND '

e.2 Restore one of the inoperable diesel generators to OPERABLE status within 2 .

hours or be in H0T STANDBY within the next l 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and 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 />. ,

AND I

e.3 Following restoration of one diesel generator restore remaining inoperable diesel generator to OPERABLE status following the time requirements of Action .

l St tement b above based on the initial 1 loss of the remaining inoperable diesel generator.

l SURVEILLANCE REQUIREMEhTS _

4.8.1.1.1 Verify correct breaker alignment and indicated .

each required offsite circuit at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. power available for 4.8.1.1.2 Each required diesel generator shall be demonstrated OPERABLE:*

a. I At least once per 31 days on a STAGGERED TEST BASIS by:

1.

Verifying the fuel level in the fuel oil supply tank, l

2. Verifying the diesel starts from standby conditions and i Jf a m#ml accelerates to 190% of rated speed and to 197% of rated

[ SM, a s jus + clekrd, is e ruse /, %

voltage.** A modified. start involving idling and gradual re acceleration to synchronous speed may be used as recommended by

%go,ams, eik e o/ -

the manufacturer.J 4

8f a'"'"" # 3. Verifying the generator is synchronized and loaded in l "//

4 4Y' ' /</M 8'd'# accordance with the manufacturer's recommendations to 11300 kW g es b and operates with a load 11300 kW for 160 minutes.**

  • All diesel starts may be preceded by an engine prelube period.

i

    • Performance Requirement.

of Surveillance Requirement 4.8.1.1.2.d satisfies this Surveillance I I

HILLSTONE - UNIT 2 3/4 8-2a i

_ Amendment No. J77, '

9902170183 990211 PDR ADOCK 05000336  !

P PDR l

z.

3/4.8 ELECTRICAL POWER SYSTEMS i 4 .

BASES I

L 3.

An independently testable component with no potential common mode failure for the remaining diesel generator. I i

During performance of Surveillance Requirements 4.8.1.1.2.a.2 and i i

4.8.1.1.2.d.2,-

following signals: the diesel generators shall be started by using one of the

)

1. . Manual; l 2.

Simulated loss of offsite power in conjunction with a safety injection actuation signal;

3. 1 Simulated safety injection actuation signal alone; or I
4. . Simulated loss of power alone.

i The diesel generator surveillance requirements specify that the diesel generators are started from a standby condition. Standby conditions for a  !

diesel generator means the diesel engine coolant and oil are being circulated and temperature is being maintained consistent with manufacturer l

recommendations.

gg g I i The OPERABILITY of the minimum specified A.C.and D.C. power sources and associated-distribution systems during shutdown and refueling ensures that 1) i condition for extended time periods and 2)the facility can be maintaine sufficient instrumentation and facilitycontrol status.capability is available for monitoring and maintaining the .

l The non-safety grade 125V D.C. Turbine Battery is required for accident mitigation for a main steam line break within containment with a coincident loss of a vital D.C. bus. The Turbine Battery provides the i

alternate grade source5of Inverters & power

5. for Inverters 1 & 2 respectively via non-safety For the loss of a 0.C. event with a coincident steam line break within containment, the feedwater regulating valves are l

required to close to ensure containment design pressure is not exceeded.

The feedwater regulating valves require power to close. On loss j of a vital D.C. bus, the alternate source of power to the vital A.C.- bus  ;

via the Turbine Battery ensures power is available to the affected feedwater the faulted regulating generator. valve such that the valve will isolate feed flow into bus- The Turbine Battery is considered inoperable when i i

1 I

I 5 )

i

I

/ -

l MILLSTONE - UNIT 2 8 3/4 8-lb

!- 03s4 Amendment No. J7p, J77,

INSERT A - Paoe B 3/4 8-ib Surveillance Requirement (SR) 4.8.1.1.2.d.1 verifies that the diesel generators will reach 190% of rated speed and 2 97% of rated voltage within 15 seconds after a start signalis generated. Diesel generator voltage and speed will continue to increase to rated values, and then should stabilize. The time for voltage and speed (frequency) to stabilize is periodically monitored and the trend evaluated to identify degradation of j governor or voltage regulator performance when testing in accordance with the i requirements of SR 4.8.1.1.2.d.i. )

f i l 1

1 I

i

l Docket No. 50-336 l B17669 l

Attachment 3 Millstone Nuclear Power Station, Unit No. 2 l Additional Modifications to a Proposed Revision to Technical Specifications Diesel Generator Surveillance Requirements (TAC No. MA2311)

Retyped Pages l

l February 1999 i

ELECTRICAL POWER SYSTEMS ACTION (Continuedi Inoperable Equipment Required Action
e. Two diesel e.1 Perform Surveillance Requirement 4.8.1.1.1 generators for the offsite circuits within I hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter.

AND i e.2 Restore one of the inoperable diesel generators to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in H0T 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 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 />.

AND e.3 Following restoration of one diesel generator restore remaining inoperable diesel generator to OPERABLE status following the time requirements of Action Statement b above based on the initial loss of the remaining inoperable diesel generator.

SURVEILLANCE REQUIREMENTS 4.8.1.1.1 Verify correct breaker alignment and indicated power available for each required offsite circuit at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

4.8.1.1.2 Each required diesel generator shall be demonstrated OPERABLE:*

a. At least once per 31 days on a STAGGERED TEST BASIS by:
1. Verifying the fuel level in the fuel oil supply tank, l
2. Verifying the diesel starts from standby conditions and accelerates to 2 90% of rated speed and to 197% of rated vol t age .** A modified start involving idling and gradual acceleration to synchronous speed may be used as recommended by the manufacturer. If a modified start, as just defined, is not used, the requirements of Surveillance Requirement 4.8.1.1.2.d.1 apply for this test.
3. Verifying the generator is synchronized and loaded in accordance with the manufacturer's recommendations to 1 1300 kW and operates with a load 2 1300 kW for 1 60 minutes.**
  • All diesel starts may be preceded by an engine prelube period.
    • Performance of Surveillance Requirement .... 4.81 12 d satisfies this Surveillance Requirement.

MILLSTONE - UNIT 2 3/4 8-2a Amendment No. J77, 0353 i

( _

3/4.8 EL_lhCTRICAL POWER SYSIfM i BASES I

3. An independently testable component with no potential common mode failure for the remaining diesel generator.

During performance of Surveillance Requirements 4.8.1.1.2.a.2 and 4.8.1.1.2.d.2, the diesel generators shall be started by using one of the following signals:

)

1. Manual;  !
2. Simulated loss of offsite power in conjunction with a safety injection actuation signal;
3. Simulated safety injection actuation signal alone; or l
4. Simulated loss of power alone. <

The diesel generator surveillance requirements specify that the diesel generators are started from a standby condition. Standby conditions for a diesel generator means the diesel engine coolant and oil are being circulated and temperature is being maintained consistent with manufacturer recommendations.

Surveillance Requirement (SR) 4.8.1.1.2.d.1 verifies that the diesel generators will reach 2 90% of rated speed and 2 97% of rated voltage within 15 seconds after a start signal is generated. Diesel generator voltage and speed will continue to increase to rated values, and then should stabilize.

The time for voltage and speed (frequency) to stabilize is periodically monitored and the trend evaluated to identify degradation of governor or voltage regulator performance when testing in accordance with the requirements of SR 4.8.1.1.2.d.l.

The OPERABILITY of the minimum specified A.C.and D.C. power sources and associated distribution systems during shutdown and refueling ensures that 1) the facility can be maintained in the shutdown or refueling condition fcr extended time periods and 2) sufficient instrumentation and control capability is available for monitoring and maintaining the facility status.

I The non-safet" grade 125V D.C. Turbine Battery is recuireo for i accident mitigation for a main steam line break within conbinment with a  !

coincident loss of a vital D.C. bus. The Turbine Battery provides the alternate source of power for Inverters 1 & 2 respectively via non-safety grade Inverters 5 & 6.

For the loss of a D.C. event with a coincident steam line break within containment, the feedwater regulating valves are required to close to ensure containment design pressure is not exceeded.

The feedwater regulating valves require power to close. On loss of a vital D.C. bus, the alternate source of power to the vital A.C. bus via the Turbine Battery ensures power is available to the affected feedwater regulating valve such that the valve will isolate feed flow into the faulted generator. The Turbine Battery is considered inoperable when bus MILLSTONE - UNIT 2 8 3/4 8-lb Amendment No. J$$, J77, 0364

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