ML20082Q268

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Proposed Tech Specs Re Addition of Note Indicating Provisions Not Applicable for Entry Into Mode 4 from Mode 5 for License DPR-65
ML20082Q268
Person / Time
Site: Millstone Dominion icon.png
Issue date: 04/21/1995
From:
NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO.
To:
Shared Package
ML20082Q262 List:
References
NUDOCS 9504280129
Download: ML20082Q268 (7)
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February 15,1995 l l

ptEACT!YITY C0ffTROL SYSTEMS CHARGING PUMPS - OPERATING LIMITING CONDITION FOR OPERATION 3.1.2.4 At,. least two** charging pumps shall be OPERABLE. l APPLICABILITY: MDDES 1, 2, 3 and ACTION:

With only one charging pump DPERABLE, restore at least two charging pumps I to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in HOT STANDBY within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; restore at least two charging pumps to OPERABLE status within the next 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. '

i SURVEILLANCE REQUIREMENTS 4.1.2.4.1 Two charging pumps shall be demonstrated OPERABLE at least once per 31 days on a STAGGERED TEST BASIS by:

a. Starting (unless already operating) each pump from the control l room, and l
b. Verifying that each pump operates for at least 15 minutes. l 4.1.2.4.2 One charging pump shall be demonstrated inoperable at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> whenever the temperature of one or more of the RCS cold legs is < 300*F by verifying that the motor circuit breaker is in the open position.

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/Oopc2A2ur "Pursmar n:, Swet,aec.mW 3. I. 2. 3 'Provieled +ke_,

c_lv c6 NA he is tcsk,r n:0_ 4o OPER ABLf sre talTulo At tr4sT' 4 h o u cs, c;r- hor 4c) t 04ecws McBE ~3., educt eu -- cc:ees J/

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    • A maximum of two charging pumps shall be OPERABLE whenever the temperature of one or more of the RCS cold legs is less than 300*F.

r"o m  :

3/4 1-13 Amendment No.185 t27950421 6

,, ADOCK 0500

n g -) 4 {

February 15,1995 BASES 3/4.1.2 BORAT10N SYSTEMS (Continued)

The analysis to determine the boration requirements assumed that the Reactor Coolant System is borated concurrently with cooldown. In the limiting situation when letdown is not available, the cooldown is assumed to be initiated within 26 hours3.009259e-4 days <br />0.00722 hours <br />4.298942e-5 weeks <br />9.893e-6 months <br /> and cooldown to 220*F, is completed in the next 28 <

I hours.

With the RCS temperature below 200*F, one injection system is acceptable l without single failure consideration on the basis of the stable reactivity  !

condition of the reactor and the additional restrictions prohibiting CORE l ALTERATIONS and positive reactivity change in the event the single injection system becomes inoperable. j

! The boron capability required below 200*F is based upon providing a SHUTDOWN MARGIN within the limit specified in the CORE OPERATING LIMITS REPORT at 140*F after xenon decay. This condition requires either 3750 gallons of 2.5% boric acid solution from the boric acid tanks or 57,300 gallons of 1720 ppm borated water from the refueling water storage tank.

1 The maximum boron concentration requirement (3.5%) and the minimum i

temperature requirement (55'F) for the Boric Acid Storage Tank ensures that boron does not precipitate in the Boric Acid System. The daily surveillance -

requirement provides sufficient assurance that the temperature of the tank will be maintained higher than 55'F at all times.

A minimum boron concentration of 1720 ppa is required in the RWST at all times in order to satisfy safety analysis assumptions for boron dilution incidents and other transients using the RWST as a borated water source as t well as the analysis assumption to determine the boratien requirement to ensure adequate shutdown margin.

A maximum of two charging pumps OPFRAFLE, when RCS temperature is less .

then 300*F, ensures that the maximum inadvertent dilution flow rate as assumed in the boron dilution analysis is 88 gallons per minute.  ;

The requirements for maximum pumping capability to reduce shutdown risk .

and low temperature overpressure protection are met by balancing the number of I OPERABLE pumps with PORVs and RCS vents. An LTOP accident scenario assumes all OPERABLE pumps start, one relief path fails, and RCS pressure then must remain less than the 10CFR50, Appendix G limits. For shutdown risk reduction, it is desirable to have the maximum pump capacity and maintain the RCS full i (notvented). The y M peidered by these technical specifications are  !

as follows: (1) A te4w9munjpumping capability of I charging and 1 HPSI pump ,

with relief from 2 PORys (to account for single failure); (2) pumping capacity  !

of 2 charging pumps and 1 HPSI pump or 2 charging pumps and 2 HPSI pumps with relief from an RCS passive vent of greater than or equal to 2.8 square inches.

To further reduce shutdown risk by maximizing pumping capacity, a HPSI pump may be made inoperable but available at short notice by shutting. its discharge valve with the key lock on the control panel.

M ent ONE - UNIT 2 5 3/4 1-3 Amendment No. JJ. FJ. 77. JJf.

em 11,119,197,185 nPC i

INSERT A The provision in Specification 3.1.2.4 that Specifications 3.0.4 and 4.0.4 are not applicable for entry into MODE 4 is provided to allow for closing the motor circuit breaker and subsequent testing of the inoperable charging pump.

Specification 3.1.2.3, which is applicable to MODES 5 and 6, requires that one charging pump be OPERABLE. Specification 3.1.2.4 requires that at least two charging pumps be OPERABLE in MODES 1,2,3, and 4. The exception from Specification 3.0.4 and 4.0.4 will allow Millstone Unit No. 2 to enter into i MODE 4 and test the inoperable charging pump and declare it OPERABLE.

Docket No. 50-336 B15199  !

1 9 I Attachment 2 L

Millstone Nuclear Power Station, Unit No. 2  ;

Proposed Revision to Technical Specifications Charging Pumps-Operating ,

Retyped Pages 4

i I

l April 1995

I I

n ,

i REACTIVITY CONTROL SYSTEMS l CHARGING PUNPS - OPERATING LINITING COMITION FOR OPERATION j i

3.1.2.4 At least two** charging pumps shall be OPERABLE.

1 APPLICABILITY: MODES 1, 2, 3 and 4*. l l ACTION:

With only one charging pump OPERABLE, restore at least two charging pumps  ;

to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in HOT STANDBY within the next 4 i hours; restore at least two charging pumps to OPERABLE status within the j next 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in COLD SHUTDOWN within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. l SURVEILLANCE REQUIRENENTS 4.1.2.4.1 Two charging pumps shall be demonstrated OPERABLE at least once per 31 days on a STAGGERED TEST BASIS by:

a. Starting (unless already operating) each pump from the control  !

room, and l

b. Verifying that each pump operates for at least 15 minutes.

4.1.2.4.2 One charging pump shall be demonstrated inoperable at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> whenever the temperature of one or more of the RCS cold legs is < 300*F by verifying that the motor circuit breaker is in the open position.

  • The provisions of Specification 3.0.4 and 4.0.4 are not applicable for entry into MODE 4 for the charging pump that is inoperable pursuant to Specification 3.1.2.3 provided the charging pump is restored to OPERABLE status within at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or prior to entering MODE 3, Michever comes first.
    • A maximum of two charging pumps shall be OPERABLE whenever the temperature of one or more of the RCS cold legs is less than 300*F.

NILLSTONE - UNIT 2 3/4 1-13 Amendment No. JpJ, 0191

h .

BASES 3/4.1.2 BORATION SYSTEMS (Continued)

The analysis to determine the boration requirements assumed that the Reactor Coolant System is borated concurrently with cooldown. In the limiting situation when letdown is not available, the cooldown is assumed to be initiated within 26 hours3.009259e-4 days <br />0.00722 hours <br />4.298942e-5 weeks <br />9.893e-6 months <br /> and cooldown to 220*F, is completed in the next 28 hours3.240741e-4 days <br />0.00778 hours <br />4.62963e-5 weeks <br />1.0654e-5 months <br />.

With the RCS temperature below 200*F, one injection system is acceptable without single failure consideration on the basis of the stable reactivity condition of the reactor and the additional restrictions prohibiting CORE ALTERATIONS and positive reactivity change in the event the single injection system becomes inoperable.

The boron capability required below 200*F is based upon providing a SHUTDOWN MARGIN within the limit specified in the CORE OPERATING LIMITS REPORT at 140*F after xenon decay. This condition requires either 3750 gallons of 2.5% boric acid solution from the boric acid tanks or 57,300 gallons of 1720 ppm borated water from the refueling water storage tank.

The maximum boron concentration requirement (3.5%) and the minimum temperature requirement (55'F) for the Boric Acid Storage Tank ensures that boron does not precipitate in the Boric Acid System. The daily surveillance requirement provides sufficient assurance that the temperature of the tank will be maintained higher than 55'F at all times.

A minimum boron concentration of 1720 ppa is required in the RWST at all times in order to satisfy safety analysis assumptions for boron dilution incidents and other transients using the RWST as a borated water source as well as the analysis assumption to determine the boration requirement to ensure adequate shutdown margin.

A maximum of two charging pumps OPERABLE, when RCS temperature is less than 300*F, ensures that the maximum inadvertent dilution flow rate as assumed in the boron dilution analysis is 88 gallons per minute.

The requirements for maximum pumping capability to reduce shutdown risk and low temperature overpressure protection are met by balancing the number of OPERABLE pumps with PORVs and RCS vents. An LTOP accident nenario assumes all OPERABLE pumps start, one relief path fails, and RCS pri sure then must remain less than the 10CFR50, Appendix G limits. For shutdown risk reduction, it is desirable to have the maximum pump capacity and maintain the RCS full (not vented). The scenarios considered by these technical specifications are ,

as follows: (1) A pumping capability of I charging and 1 HPSI pump with relief l

from 2 PORVs (to account for single failure); (2) pumping capacity of 2 charging pumps and 1 HPSI pump or 2 charging pumps and 2 HPSI pumps with relief from an RCS passive vent of greater than or equal to 2.8 square inches. To further i reduce shutdown risk by maximizing pumping capacity, a HPSI pump may be made inoperable but available at short notice by shutting its discharge valve with the key lock on the control panel.

NILLSTONE - UNIT 2 8 3/4 1-3 Amendment No. # , 71,71,14, ]

mn H,in,1H,1H, ,

1 I

1: ..

BASES 3/4.1.2 B0 RATION SYSTEMS (Continued)

Tha provision in Specification 3.1.2.4 that Specifications 3.0.4 and 4.0.4 are not applicable for entry into MODE 4 is provided to allow for closing the motor circuit breaker and subsequent testing of the inoperable charging pump.

Specification 3.1.2.3, which is applicable to MODES 5 and 6, requires that one charging pump be OPERABLE. Specification 3.1.2.4 requires that at least two charging pumps be OPERABLE in MODES 1, 2, 3, and 4. The exception from Specification 3.0.4 and 4.0.4 will allow Millstone Unit No. 2 to enter into MODE 4 and test the inoperable charging pump and declare it OPERABLE.

3/4.1.3 MOVEABLE CONTROL ASSEMBLIES The specifications of this section ensure that (1) acceptable power l distribution limits are maintained, (2) the minimum SHUTDOWN MARGIN is '

maintained, and (3) the potential effects of a CEA ejection accident are limited to acceptable levels. j The ACTION statements which permit limited variations from the basic l requirements are accompanied by additional restrictions which ensure that the '

original criteria are met.

The ACTION statements applicable to an immovable or untrippable CEA and to a large misalignment (120 steps) of two or more CEAs, require a prompt shutdown of the reactor since either l

l I

l MILLSTONE - UNIT 2 B 3/4 1-3a Amendment No. JJ, JJJ JJ),

0192

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