ML20093M461

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Proposed TS 3.8.1.1,replacing Words Except That for Cycle 13 Only W/During Millstone Unit 1 Refueling Outage 15 & Adding Footnote to TS Bases Section on Page B 3/4 8-1
ML20093M461
Person / Time
Site: Millstone Dominion icon.png
Issue date: 10/23/1995
From:
NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20093M444 List:
References
NUDOCS 9510260292
Download: ML20093M461 (7)
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Text

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Docket No. 50-336 B15403 1

Attachment 2 Millstone Nuclear Power Station, Unit No. 2 Proposed Revision to Technical Specifications Cycle-Specific A.C. Sources Allowed Outage Time Extension Marked-up Pages October 1995 i

i 9510260292 951023 '

PDR ADOCK 05000336 P PDR

,., 6/14/94 3/4.8 ELECTRICAL POWER SYSTEMS 344.3.1 A.C. SOURCES i  :

OPERATING

. LINITIN8 COMITION FOR OPERATION <

3.8.1.1 As a minimum, the following A.C. electrical power sources shall be OPERABLE:

, a. Two physically independent circuits between the offsite trans-mission network and the switchyard, and

b. Two separate and independent diesel generators each with a separate fuel oil supply tank containing a minimum of 12,000 gallons of fuel. ,

NPPLICABILITY: MODES, 1, 2, 3 and 4.

ACTION:

a. With one offsite circuit inoperable, demonstrate the OPERABILITY I of the remaining A.C. sources by perfoming Surveillance Requirement 4.8.1.1.1 within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 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. If either diesel generator has not been successfully tested within the past 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, demonstrate its OPERABILITY by perfoming Surva111ance Requirement 4.8.1.1.2.a.2 separately for each such diesel generator within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. 3 Restore the offsite circuit to OPERABLE status within 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />sb. ,

l or be in at least 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 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 />,

b. With one diesel generator inoperable, demonstrate the OPERABILITY cf the A.C. offsite sources by performing Surveillance Requirement 4.8.1.1.1 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 if the diesel generator became inoperable due to any cause other than preplanned preventative maintenance or testing, demonstrate the OPERABILITY of the remaining 0PERABLE diesel generator by performing Surveillance Requirement 4.8.1.1.2.a.2 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> *; restore the diesel generator to OPERABLE status 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 NOT 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 COLD SHUTDOWN within thQ1.owingj0Ja "D' *** M"'d 6 ~ W "' ""W '^"" * )

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  • This test is recuired to be completed regardless of when the inoperable

, diesel generator 's restored to an OPERABLE status.

NILLSTONE - WIT 2 3/48-1 Amendment No.6 ,

  1. 101 177

May 17,1995 M I

3/(,A ELECTRICAL POWER SYSTDt3 4

BASES

] The OPERABILITY of the A.C. and D.C. power sources and associated distribution systems during operation' ensures that sufficient power will be available to supply the safety related equipment required for 1) the safe shutdown of tie facility and 2 i accidentconditionswithinthefaci)ity.the mitigation and The minimum controlindepen-specified of i dont and redundant A.C. and D.C. power sources and distribution systems satisfy the requirements of General Design Criteria 17 of Appendix "A" to 10 CFR 50.

The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility operation commensurate with the level of degradation. The OPERABILITY of the power sources are consistent with the initial condition assumptions of the accident analyses and are based upon maintaining at least one of each of the onsite A.C. and D.C. power sources and associated distribution systems OPERABLE during accident conditions coincident with an assumed loss of offsite power and single failure of the other onsite A.C. source.

The OPERABILITY of the minimum specified A.C and D.C. power sources and associated distribution systems during shutdown and refueling ensures j

that 1) the facility can be maintained in the shutdown or refue ing condition for extended time periods and 2) sufficient instrumentation and control cap ility is available for monitoring and maintaining the facility status e 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 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 ,

i 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 of a vital D.C. bus, the alternate source of power to the vital A.C. bus via the k' Turbine Battery ensures power is available to the affected feedwater

d i e %t' o regulating valve such that the valve will !solate feed flow into the faalted nonerator. The Turbine Battarv in considored inonarmh1. when hun y vo' tage 's less snan un voits U.C. thereby ensur' ng adequate capacity for M
isolation functions via the feedwater regulating valves during the onset of a steam line break.

The Turbine Battery Charger is not required to be included in Technical Specifications even though the Turbine Battery is needed to power k backup Inverters 5 & 6 for a main steam line break inside containment j coincident with a loss of a Class IE D.C. bus. This is due to the fact

! _feedwater inalation a-rm within seennds fena +ka aaset of the event.-

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UN!T' 'diian .1 I.NIST0 YN h

C Docket No. 50-336 B15403 l

Attachment 3 Millstone Nuclear Power Station, Unit No. 2 Proposed Revision to Technical Specifications cycle-specific A.C. Sources Allowed Outage Time Extension Retyped Version of Current Technical Specifications l

I l

l October 1995

o' 3/4.8 ELECTRICAL POWER SYSTENS 3/4.8.1 A.C. SOURCES OPERATING LINITING COM)ITION FOR OPERATION 3.8.1.1 As a minimum, the following A.C. electrical power sources shall be OPERABLE:

a. Two physically independent circuits between the offsite trans-mission network and the' switchyard, and
b. Two separate and independent diesel generators each with a separate fuel oil supply tank containing a minimum of 12,000 gallons of fuel.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

a. With one offsite circuit inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirement 4.8.1.1.1 within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 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. If either diesel generator has not been successfully tested within the past 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />,' demonstrate its OPERABILITY by performing Surveillance Requirement 4.8.1.1.2.a.2 separately for each such diesel generator within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

Restore the offsite circuit to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> ** l 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 COLD SHUTDOWN within the following 39 hours4.513889e-4 days <br />0.0108 hours <br />6.448413e-5 weeks <br />1.48395e-5 months <br />.

b. With one diesel generator inoperable, demonstrate the OPERABILITY of the A.C. offsite sources by performing Surveillance Requirement 4.8.1.1.1 within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once ser 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter; and if the diesel generator became inoperaale due to any cause other than preplanned preventative maintenance or testing, demonstrate the OPERABILITY of the remaining OPERABLE diesel generator by performing Surveillance Requirement 4.8.1.1.2.a.2 within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> *; restore the diesel generator to OPERABLE status 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 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 />.
  • This test is required to be completed regardless of when the inoperable diesel generator is restored to an OPERABLE status.
    • During the Unit 1 Refueling Outage 15 - Restore the electrical cross-tie to Unit I to OPERABLE status within 7 days 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 COLD SHuiDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

NILLSTONE - UNIT 2 3/4 8-1 Amendment No. JJ, J//,

0221

3/4.8 ELECTRICAL POWER SYSTEMS BASES The OPERABILITY of the A.C. and D.C. power sources and associated distribution systems during operation ensures that sufficient power will l be available to su) ply the safety related equipment required for 1) the 'j safe shutdown of tie facility and 2) the mitigation and control of )

accident conditions within the facility. The minimum specified indepen- i dent and redundant A.C. and D.C. power sources and distribution systems 1 satisfy the requirements of General Design Criteria 17 of Appendix "A" '

to 10 CFR 50.

The ACTION requirements specified for the levels of degradation of the power sources provide restriction upon continued facility. operation commensurate with the level of degradation. The OPERABILITY of the power sources are consistent with the initial condition assumptions of the accident analyses and are based upon maintaining at least one of each of the onsite A.C. and D.C. power sources and associated distribution systems OPERABLE during accident conditions' coincident with an assumed loss of i offsite power and single failure of the other onsite A.C. source. 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 for extended time periods and 2) sufficient instrumentation l and control capability is available for monitoring and maintaining the facility status.* 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 alternate source of power for Inverters 1 & 2 respectively via non-safety i 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.

l The feedwater regulating valves require power to close. On loss of a vital i 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 i faulted generator. The Turbine Battery is considered inoperable when bus 4

  • A probabilistic safety assessment has examined the affect of extending the allowed outage time to seven (7) days for the electrical cross-tie from Unit 1 to Unit 2 during the' Unit 1 Refueling Ontage 15. The results shows that the increase in risk is acceptable provided that two diesel generators are available.

NILLSTONE - UNIT 2 B 3/4 8-1 Amendment No. Jpp, 0222

e 3/4.8 ELECTRICAL POWER SYSTEMS BASES

? 1 l

i voltage is less than 125 volts D.C, thereby ensuring cdequate capacity for isolation functions via the feedwater regulating valves during the onset of a steam line break.

l~

The Turbine Battery Charger is not required to be included in Technical Specifications even though the Turbine Battery is needed to power

! backup Inverters 5 & 6 for a main steam line break inside containment '

roincident with a loss of a Class IE D.C. bus. This is due to the fact t that feedwater isolation occurs within seconds from the onsct of the event.

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'ILLSTONE A - UNIT 2 8 3/4 8-2 Amendment No. 177.

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