Text

Proposed Tech Specs to Increase Min Required Vol of Water in Condensate Storage Tank T-120 from 280,000 to 360,000 Gallons
	ML20206R280
Person / Time
Site:	San Onofre
Issue date:	01/11/1999
From:	; SOUTHERN CALIFORNIA EDISON CO.
To:	;
Shared Package
ML20206R274	List: ML20206R270; ML20206R276; ML20206R280; ML20206R292; ML20206R497;
References
	NUDOCS 9901190225
	Download: ML20206R280 (30)
	v • d • e

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CST T-121 and T-120 3.7.6 3

3.7 PLANT SYSTEMS 3.7.6 Condensate Storage Tank (CST T-121 and T-120)

! LC0 3.7.6 The CST T-121 contained volume shall be 2 144,000 gallons and CST T-120 contained volume shall be 2 280,000 gallons.

l l

APPLICABILITY: MODES 1, 2, and 3, MODE 4 when steam generator is relied upon for heat removal.

l ACTIONS 1 CONDITION REQUIRED ACTION COMPLETION TIME A. CST T-121 or T-120 A.1 Verify OPERABILITY of 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months contained volumes not backup water supply, within limit. E

\

i Once per ,

i 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter M

l A.2 Restore CST T-121 and 7 days l

T-120 contained volumes to within l limit.

l B. Required Action and B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time not met. M B.2 Be in MODE 4 without 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months reliance on steam generator for heat ;

removal. l l

l l

l i

[ SAN ON0FRE--UNIT.2 3.7-16 Amendment No. 127

{. ; 9901190225 990111 l' ADOCK 05000361j i

PDR

! P PDR,2

CST T-121 and T-120 B 3.7.6 i B 3.7 PLANT SYSTEMS l B 3.7.6 Condensate Storage Tank (CST T-121 and T-120) l BASES l

BACKGROUND The CST provides a safety grade source of water to the steam generators for removing decay and sensible heat from the Reactor Coolant System (RCS). The CST provides a passive i

flow of water, by gravity, to the Auxiliary Feedwater (AFW) -

System (LC0 3.7.5, " Auxiliary Feedwater (AFW) System"). The steam produced is released to the atmosphere by the main steam safety valves (MSSVs) or the atmospheric dump valves.

The AFW pumps operate with a continuous recirculation to the

! CST.

When the main steam isolation valves are open, the preferred means of heat removal is to discharge steam to the condenser by the nonsafety grade path of the steam bypass valves. The condensed steam is returned to the CST. This has the advantage of conserving condensate while minimizing releases l to the environment.

l l

Because the CST is a principal component in removing residual heat from the RCS, it is designed to withstand l earthquakes and other natural phenomena.

I CST T-121 is the suction source for the three AFW pumps. It is designed to Seismic Category I requirements and enclosed '

in a Seismic Category I vault that provides protection against earthquakes and other natural phenomena. CST T-120 is not Seismic Category I, but is enclosed in a Seismic l Category I structure designed to retain water following an l earthquake and to provide limited protection against other natural phenomena. Seismic Category I makeup to CST T-121 is provided by gravity feed through cross-ties from T-120 and the T-120 enclosure. Following a tornado event, remains in T-120 such that water from

sufficient inventory (which may contain debris) would not be the T-120 enclosure -

needed.

l Backup water supplies are available via non-Seismic Category i

I makeup to CST T-121 and T-120. Normal makeup is provided by gravity feed from the High Flow Makeup Demineralizer (HFMUD) tanks. Makeup may also be provided by the Units 2 and 3 Fire Water Pumps from the Units 2 and 3 Fire / Service Water Tanks, by gravity' feed or the Unit 1 Fire Water Pumps (continued) i SAN ONOFRE--UNIT 2 B 3.7-35 Amendment No. 127 05/30/97

CST T-121 and T-120 8 3.7.6 BASES !

BACKGROUND from the Unit 1 Service Water Reservoir, or by the (continued) Condensate Transfer System between Units 2 and 3. However, the water volume required in the other unit's CST by the other unit's Technical Specifications is not available as a backup supply.

A description of the CST is found in the UFSAR, Section 9.2.6 (Ref. 1).

APPLICABLE The CST provides cooling water to remove decay heat SAFETY ANALYSES and to cool down the unit following all events in the 4

accident analysis (except Large Break LOCA), discussed in the UFSAR, Chapters 3, 6 and 15 (Refs. 2, 3, and 4 respectively). For anticipated operational occurrences and accidents which do not affect the OPERABILITY of the steam generators, the analysis assumption is generally 30 minutes at MODE 3, steaming through the MSSVs followed by a cooldown using the ADVs to shutdown cooling (SDC) entry SAFETY ANALYSES conditions at the design cooldown rate.

The limiting event for the condensate volume is the Reactor Systems Branch Technical Position 5-1 (RSB 5-1) safe shutdown scenario. For the RSB 5-1 scenario, safe shutdown must be demonstrated using only safety grade systems, assuming a coincident loss of onsite or offsite power, and a concurrent single failure. For sizing of the condensate volume, 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of steaming are assumed, 1ncluding 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months at hot standby prior to initiating cooldown. The limiting single failures for the RSB 5-1 scenario are:

a. Failure of an Atmospheric Dump Valve on one steam generator. This limits the steaming rate and prolongs the cooldown to Shutdown Cooling entry conditions.

This is the most limiting failure for condensate sizing.

b. Failure of one Diesel Generator. This limits the available cooldown rate from Shutdown Cooling entry to cold shutdown. This is the most limiting failure for time to cold shutdown.

The CST satisfies Criterion 3 of the NRC Policy Statement.

(continued)

SAN ON0FRE--UNIT 2 B 3.7-36 Amendment No. 127 05/30/97 L .

r 1

CST T-121 and T-120 l B 3.7.6 BASES l

l ACTIONS B.1 and B.2 j If the CST cannot be restored to OPERABLE status within the associated Completion Time, the unit must be placed in a i MODE in which the LC0 does not apply. To achieve this status, the unit must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 4, without reliance onsteam generator for heat removal, within 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full 30wer ,

conditions in an orderly manner and without clallenging unit l systems. )

l SURVEILLANCE SR 3.7.6.1 REQUIREMENTS This SR verifies that the_ CST contains the required volume ,

of cooling water. The required volume of cooling water in 1 CST T-121 is 144,000 gallons. That corresponds to 96%. The required volume of cooling water in CST T-120 is 280,000 gallons. That corresponds to 52%. The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is

! based on operating experience, and the need for operator l awareness of unit evolutions that niay affect the CST ,

inventory between checks. The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is considered adequate in view of other indications in the control room, including alarms, to alert the operator to l

abnormal CST level deviations.

REFERENCES 1. UFSAR, Section 9.2.6.

2. UFSAR, Chapter 3

3. UFSAR, Chapter 6.

l

4. UFSAR, Chapter 15.

l l l

l i

SAN ON0FRE--UNIT 2 B 3.7-38 Amendment No. 127 05/30/97

PCN-499 ATTACHMENT B (Existing Technical Specification and Bases Pages)

SONGS Unit 3 i

l l

l 1

i l

l l

CST T-121 and T-120 l 3.7.6 l 3.7 PLANT SYSTEMS

3.7.6 Condensate Storage Tank (CST T-121 and T-120) l LC0 3.7.6 The CST T-121 contained volume shall be 2 144,000 gallons and CST T-120 contained volume shall be > 280,000 gallons.

APPLICABILITY: MODES 1, 2, and 3, MODE 4 when steam generator is relied upon for heat removal.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME l A. CST T-121 or T-120 A.1 Verify 0PERABILITY of 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months contained volumes not backup water supply, within limit. AtiQ l

Once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter l Atill l

A.2 Restore CST T-121 and 7 days :

T-120 contained l volumes to within :

limit.

B. Required Action and 8.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time not met. AliQ B.2 Be in MODE 4 without 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months reliance on steam l generator for heat removal.

[ SAN ON0FRE--UNIT 3 3.7-16 Amendment No. 116 i

1 CST T-121 and T-120 B 3.7.6 i

B 3.7 PLANT SYSTEMS j B 3.7.6 Condensate Storage Tank (CST T-121 and T-120) l BASES l

l BACKGROUND The CST provides a safety grade source of water to the steam generators for removing Reactor Coolant System RCS). (decay and The CST sensible heat provides from the a passive flow of water, by gravity, to the Auxiliary Feedwater ,

I System (LC0 3.7.5, " Auxiliary Feedwater (AFW) System")(AFW)

. The steam produced is released to the atmosphere by the main steam safety valves (MSSVs) or the atmospheric dump valves.

The AFW pumps operate with a continuous recirculation to the l CST.

I When the main steam isolation valves are open, the preferred means of heat removal is to discharge steam to the condenser by the nonsafety grade path of the steam bypass valves. The condensed steam is returned to the CST. This has the advantage of conserving condensate while minimizing releases to the environment.

Because the CST is a principal component in removing residual heat from the RCS, it is designed to withstand earthquakes and other natural phenomena.

CST T-121 is the suction source for the three AFW pumps. It is designed to Seismic Category I requirements and enclosed in a Seismic Category I vault that provides protection against earthquakes and other natural phenomena. CST T-120 is not Seismic Category I, but is enclosed in a Seismic Category I structure designed to retain water following an earthquake and to provide limited protection against other natural phenomena. Seismic Category I makeup to CST T-121 is provided by gravity feed through cross-ties from T-120 and the T-120 enclosure. Following a tornado event, remains in T-120 such that water from sufficient the T-120 inventory enclosure (which may contain debris) would not be needed.

Backup water supplies are available via non-Seismic Category I makeup to CST T-121 and T-120. Normal makeup is provided by gravity feed from the High Flow Makeup Demineralizer (HFMUD) tanks. Makeup may also be provided by the Units 2 and 3 Fire Water Pumps from the Units 2 and 3 Fire / Service l Water Tanks, by gravity feed or the Unit 1 Fire Water Pumps (continued)

SAN ON0FRE--UNIT 3 B 3.7-35 Amendment No. 116 05/30/97

CST T-121 and T-120 I B 3.7.6 l l BASES 1

i BACKGROUND from the Unit 1 Service Water Reservoir, or by the (continued) Condensate Transfer System between Units 2 and 3. However, the water volume required in the other unit's CST by the other unit's Technical Specifications is not available as a backup supply. l A description of the CST is found in the UFSAR, l Section 9.2.6 (Ref. 1).

APPLICABLE The CST provides cooling water to remove decay heat SAFETY ANALYSES and to cool down the unit following all events in the accident analysis (except Large Break LOCA), discussed in the UFSAR, Chapters 3, 6 and 15 (Refs. 2, 3, and 4 respectively). For anticipated operational occurrences and l accidents which do not affect the OPERABILITY of the steam generators, the analysis assumption is generally 30 minutes at MODE 3, steaming through the MSSVs followed by a cooldown using the ADVs to shutdown cooling (SDC) entry SAFETY ANALYSES conditions at the design cooldown rate.

The limiting event for the condensate volume is the Reactor i Systems Branch Technical Position 5-1 (RSB 5-1) safe shutdown scenario. For the RSB 5-1 scenario, safe shutdown must be demonstrated using only safety grade systems, assuming a coincident loss of onsite or offsite power, and a concurrent single failure. For sizing of the condensate volume, 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of steaming are assumed, including 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months at hot standby prior to initiating cooldown. The limiting single failures for the RSB 5-1 scenario are:

a. Failure of an Atmospheric Dump Valve on one steam generator. This limits the steaming rate and prolongs the cooldown to Shutdown Cooling entry conditions.

This is the most limiting failure for condensate sizing.

b. Failure of one Diesel Generator. This limits the available cooldown rate from Shutdown Cooling entry to cold shutdown. This is the most limiting failure for time to cold shutdown.

The CST satisfies Criterion 3 of the NRC Policy Statement.

(continued)

SAN ON0FRE--UNIT 3 8 3.7-36 Amendment No. 116 05/30/97

l CST T-121 and T-120 B 3.7.6 I

l BASES ACTIONS B.1 and B.2 l If the CST cannot be restored to OPERABLE status within the i associated Completion Time, the unit must be placed in a MODE in which the LC0 does not apply. To achieve this status, the unit must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 4, without reliance onsteam generator l for heat removal, within 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months . The allowed Completion l Times are reasonable, based on operating experience, to reach the required unit conditions from full )ower l conditions in an orderly manner and without ciallenging unit .

l systems. l l

L SURVEILLANCE SR 3.7.6.1 1 l

REQUIREMENTS This SR verifies that the CST contains the required volume

! of cooling water. The required volume of cooling water in '

l CST T-121 is 144,000 gallons. That corresponds to 96%. The required volume of cooling water in CST T-120 is 280,000 gallons. That corresponds to 52%. The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is based on operating experience, and the need for operator ,

awareness of unit evolutions that may affect the CST inventory between checks. The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is

! considered adequate in view of other indications in the control room, including alarms, to alert the operator to abnormal CST level deviations.

l l REFERENCES 1. UFSAR, Section 9.2.6.

2. UFSAR, Chapter 3

3. UFSAR, Chapter 6.

4. UFSAR, Chapter 15.

l 1

e i SAN ON0FRE--UNIT 3 B 3.7-38 Amendment No. 116 05/30/97 l

I l

PCN-499 l

l l

t 1

ATTACHMENT C (Proposed Technical Specification and Bases Pages)

SONGS Unit 2 l

L l

CST T-121 and T-120 3.7.6 3.7 PLANT SYSTEMS 3.7.6 Condensate Storage Tank (CST T-121 and T-120)

LC0 3.7.6 The CST T-121 contained volume shall be 2 144,000 gallons and CST T-120 contained volume shall be 2 200,000 360,000 gallons.

~

APPLICABILITY: MODES 1, 2, and 3, MODE 4 when steam generator is relied upon for heat removal.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. CST T-121 or T-120 A.1 Verify OPERABILITY of 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months contained volumes not backup water supply.

within limit. AE Once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter AHE A.2 Restore CST T-121 and 7 days T-120 contained volumes to within limit.

I B. Required Action and B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time not met. AHQ B.2 Be in MODE 4 without 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months reliance on steam generator for heat removal.

I SAN ON0FRE--UNIT 2 3.7-16 Amendment No. 107 l

CST T-121 and T-120 ;

B 3.7.6 )

I B 3.7 PLANT SYSTEMS j B 3.7.6 Condensate Storage Tank (CST T-121 and T-120) l

)

BASES BACKGROUND The CST provides a safety grade source of water to the steam generators for removing Reactor Coolant (decayThe System RCS). andCST sensible heat provides from the a passive flow of water, by gravity, to the Auxiliary Feedwater (AFW)

System (LC0 3.7.5, " Auxiliary Feedwater (AFW) System"). The steam produced is released to the atmosphere by the main i steam safety valves (MSSVs) or the atmospheric dump valves. 1 The AFW pumps operate with a continuous recirculation to the I CST.

l 1

When the main steam isolation valves are open, the preferred i means of heat removal is to discharge steam to the condenser by the nonsafety grade path of the steam bypass valves. The I condensed steam is returned to the CST. This has the l advantage of conserving condensate while minimizing releases I to the environment. !

Because the CST is a principal component in removing residual heat from the RCS, it is designed to withstand earthquakes and other natural phenomena.

1 CST T-121 is the suction source for the three AFW pumps. It l is designed to Seismic Category I requirements and enclosed i in a Seismic Category I vault that provides protection against earthquakes and other natural phenomena. CST T-120 is not Seismic Category I, but is enclosed in a Seismic Category I structure designed to retain water following an earthquake and to provide limited 3rotection against other i natural., phenomena CST T-121 can 3e'isol.ated by Seismic l Category:I: isolation valves. ,The. minimum required volume l specified by.LCO 3.7.6 ensures;that, when S2-1414-MU-092 is ,

isolated.within 30 minutesLand 2-HV-5715 is11solated within l

90 minutes:followingLan OperatingLBasis' Earthquake, sufficient inventory remains 11n T-120 to meet the requirements. described:in the' Applicable Safety Analysis.

Seismic' Category I makeup'to CST T-121 is provided by gravity feed through cross-ties from T-120 and the T-120 enclosure. Following a tornado event, sufficient inventory remains in T-120 such that water from the T-120 enclosure (which may contain debris) would not be needed.

Backup water supplies are available via non-Seismic Category I makeup to CST T-121 and T-120. Normal makeup is provided by gravity feed from the High Flow Makeup Demineralizer (HFMUD) tanks. Makeup may also be provided by the Units 2 (continued)

SAN ON0FRE--UNIT 2 B 3.7-35 Amendment No. 127 05/30/97

CST T-121 and T-120 B 3.7.6 BASES BACKGR0'JND and 3 Fire Water Pumps from the Units 2 and 3 Fire / Service (continued) Water Tanks, by gravity feed or the Unit 1 Fire Water Pumps from the Unit 1 Service Water Reservoir, or by the Condensate Transfer System between Units 2 and 3. However, the water volume required in the other unit's CST by the other unit's Technical Specifications is not available as a backup supply.

A description of the CST is found in the UFSAR, Section 9.2.6 (Ref. 1).

APPLICABLE The CST provides cooling water to remove decay heat SAFETY ANALYSES and to cool down the unit following all events in the accident analysis (except Large Break LOCA), discussed in the UFSAR, Cha respectively).ptersFor 3, 6 and 15operational anticipated (Refs. 2, 3,occurrences and 4 and accidents which do not affect the OPERABILITY of the steam generators, the analysis assumption is generally 30 minutes at MODE 3, steaming through the MSSVs followed by a cooldown using the ADVs to shutdown cooling (SDC) entry SAFETY ANALYSES conditions at the design cooldown rate.

The limiting event for the condensate volume is the Reactor Systems Branch Technical Position 5-1 (RSB 5-1) safe shutdown scenario, For the RSB 5-1 scenario, safe shutdown must be demonstrated using only safety grade systems, assuming a coincident loss of onsite or offsite power, and a concurrent single failure. For sizing of the condensate volume, 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of steaming are assumed, including 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months at hot standby prior to initiating.cooldown. Additionally, calculated: losses -over a 30-minute: period prior to isolation ofLS2-1414-MU-092 and,a:90-minute' period' prior to:1 solation of 2-HV-5715 E Anl additionai' are considered allotment in ~ the.

of 32,616. sizing'of gallons the volume.

is' included for future allocations ~to: provide for kny "as yet" unidentified uses or losses. The limiting' single failures for the RSB 5-1 scenario are:

a. Failure of an Atmospheric Dump Valve on one steam generator. This limits the steaming rate and prolongs the cooldown to Shutdown Cooling entry conditions.

This is the most limiting failure for condensate sizing.

b. Failure of one Diesel Generator. This limits the available cooldown rate from Shutdown Cooling entry to cold shutdown. This is the most limiting failure for time to cold shutdown.

l The CST satisfies Criterion 3 of the NRC Policy Statement.

(continued) l SAN ON0FRE--UNIT 2 B 3.7-36 Amendment No. 127 05/30/97

__ .. _ _ _ . _ . . _ _ _ __ . _._._. __=_ _ __ _ . _ _ ._ . _

l l CST T-121 and T-120 l B 3.7.6 4

BASES l 1 l

ACTIONS B.1 and B.2 If the CST cannot be restored to OPERABLE status within the l l associated Completion Time, the unit must be placed in a l MODE in which the LC0 does not apply. To achieve this status, the unit must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 4, without reliance onsteam generator for heat removal, within 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full )ower conditions in an orderly manner and without clallenging unit systems.

SURVEILLANCE SR 3.7.6.1 l REQUIREMENTS This SR verifies that the CST contains the required volume l of cooling water. The required volume of cooling water in {

l CST T-121 is 144,000 gallons. That corresponds to 96%. The

! required volume of cooling water in CST T-120 is 200,000 l 360L000 gallons ab6 veet hettank?sheroidatum. That l 81% of;useableSolumeiabbve?the

! corres[iondstoipproximately)duency~'isbasedonoperating

'eroidatum. The 12' hour Fre z

l experience, and the need for operator awareness of unit evolutions that may affect the CST inventory between checks.

l The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is considered adequate in view of l

other indications in the control room, including alarms, to alert the operator to abnormal CST level deviations.

l REFERENCES 1. UFSAR, Section 9.2.6. '

2. UFSAR, Chapter 3

3. UFSAR, Chapter 6.

4. UFSAR, Chapter 15.

I

( SAN ON0FRE--UNIT 2 B 3.7-38 Amendment No. 127 05/30/97 I

i

PCN-499 ATTACHMENT D (Proposed Technical Specification and Bases Pages)

SONGS Unit 3

CST T-121 and T-120 3.7.6 t

3.7 PLANT SYSTEMS 3.7.6 CondensateStorageTank(CSTT-121andT-120) l LC0 3.7.6 The CST T-121 contained volume shall be 2 144,000 gallons and CST T-120 contained volume shall be 2 200,000 360,000 gallons.

APPLICABILITY: MODES 1, 2, and 3, MODE 4 when steam generator is relied upon for heat removal.

ACTIONS i

CONDITION REQUIRED ACTION COMPLETION TIME A. CST T-121 or T-120 A.1 Verify 0PERABILITY of 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months contained volumes not backup water supply.

within limit. Atla Once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months

thereafter l

A.2 Restore CST T-121 and 7 days T-120 contained volumes to within limit.

B. Required Action and B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time not met. AND B.2 Be in MODE 4 without 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months reliance on steam generator for heat removal.

1 l

SAN ONOFRE--UNIT 3 3.7-16 Amendment No. 446 l

- - .- -.._ - -~ .- . . - _ - ~ -- - . . - - - -.

CST T-121 and T-120 l B 3.7.6 i

B 3.7 PLANT SYSTEMS B 3.7.6 CondensateStorageTank(CSTT-121andT-120) l 1

l BASES BACKGROUND The CST provides a safety grade source of water to the steam l gererators for removing Redctor Coolant (decayThe System RCS). andCST sensible heat provides from the a passive f flow of water, by gravity, to the Auxiliary Feedwater l

System (LC0 3.7.5, " Auxiliary Feedwater (AFW) System")(AFW) . The steam produced is released to the atmosphere by the main steam safety valves (MSSVs) or the atmcspheric dump valves.

The AFW pumps operate with a continuous recirculation to the I- CST.

When the main steam isolation valves are open, the preferred

, means of heat removal is to discharge steam to the condenser l by the nonsafety grade path of the steam bypass valves. The i

condensed steam is returned to the CST. This has the

! advantage of conserving condensate while minimizing releases to the environment, i Because the CST is a principal component in removing ;

residual heat from the RCS, it is designed to withstand earthquakes and other natural phenomena.

CST T-121 is the suction source for the three AFW pumps. It

, is designed to Seismic Category I requirements and enclosed in a Seismic Category I vault that provides protection against earthquakes and other natural phenomena. CST T-120 fs not Seismic Category I, but is enclosed in a Seismic

Category I structure designed to retain water following an l earthquake and to provide limited )rotection against.Other

! natural phenomena. CST T-121- can >e isolated by Seismic

! Category I isolation: valves. The minimum required volume l specified-by LC0 3.7.6 ensures 1that, when'S3-1414-MU-092 is

' isolated within:30 minutes and:3-HV-5715 is-isolated within 90 minutes following an10perating'. Basis Earthquake, sufficienttinventory remains in T-120.to meet the requirements described ~in the' Applicable Safety Analysis.

Seismic Category'I' makeup to CST T-121 is provided by gravity feed through cross-ties from T-120 and the T-120

enclosure. Following a tornado event, sufficient inventory remains in T-120 such that water from the T-120 enclosure

! (which may contain debris) would not be needed.

Backup water supplies are available via non-Seismic Category I makeup to CST T-121 and T-120. Normal makeup is provided j by gravity feed from the High Flow Makeup Demineralizer (HFMUD) tanks. Makeup may also be provided by the Units 2 (continued)

[ SAN ON0FRE--UNIT 3 8 3.7-35 Amendment No. 115 05/30/97 l

i CST T-121 and T-120 i B 3.7.6 BASES BACKGROUND and 3 Fire Water Pumps from the Units 2 and 3 Fire / Service (continued) Water Tanks, by gravity feed or the Unit 1 Fire Water Pumps ,

from the Unit 1 Service Water Reservoi , or by the I Condensate Transfer System between Units 2 and 3. However, I the water volume required in the other unit's CST by the other unit's Technical Specifications is not available as a backup supply.

A description of the CST is found in the UFSAR, Section 9.2.6 (Ref. 1).

APPLICABLE water to remove decay heat SAFETY ANALYSES TheCSTprovidescoolinktfollowingalleventsinthe and to cool down the un accident analysis (except Large Break LOCA), discussed in the UFSAR, Chapters 3, 6 and 15 (Refs. 2, 3, and 4 respectively). For anticipated operational occurrences and accidents which do not affect the OPERABILITY of the steam generators, the analysis assumption is generally 30 minutes at MODE 3, steaming through the MSSVs followed by a cooldown using the ADVs to shutdown cooling (SDC) entry SAFETY ANALYSES conditions at the design cooldown rate.

The limiting event for the condensate volume is the Reactor Systems Branch Technical Position 5-1 (RSB 5-1) safe shutdown scenario. For the RSB 5-1 scenario, safe shutdown must be demonstrated using only safety grade systems, assuming a coincident loss of onsite or offsite power, and a concurrent single failure. For sizing of the condensate volume, 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of steaming are assumed, including 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months '

athotstandby,priortoinitiatingcooldown.Additionallyion calculated lossef over a 30-min'ute period prior to isolat of S3-1414-MU-092iandia.90-minute period prior to isolation of 3-HV-5715 are considered in the sizing of the volume.

An additional:allotmentLof: 32,616 gallons is included for future allocations'to provide;'for any "as;yet" unidentified uses or losses. The limiting single failures ~for the RSB 5-1 scenario ~are:

a. Failure of an Atmospheric Dump Valve on one steam generator. This limits the steaming rate and prolongs the cooldown to Shutdown Cooling entry conditions.

This is the most limiting failure for condensate sizing.

b. Failure of one Diesel Generator. This limits the available cooldown rate from Shutdown Cooling entry to cold shutdown. This is the most limiting failure for time to cold shutdown.

l The CST satisfies Criterion 3 of the NRC Policy Statement.

1 (continued)

SAN ON0FRE--UNIT 3 8 3.7-36 Amendment No. 115 05/30/97

CST T-121 and T-120 B 3.7.6 I

BASES ACTIONS B.1 and B.2 If the CST cannot be restored to OPERABLE status within the associated Completion Time, the unit must be placed in a MODE in which the LC0 does not apply. To achieve this status, the unit must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 4, without reliance onsteam generator for heat removal, within 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months . The allowed Completion l i Times are reasonable, based on operating experience, to

! reach the required unit conditions from full aower l

conditions in an orderly manner and without ciallenging unit l l systems. l l

I SURVEILLANCE SR 3.7.6.1 1 REQUIREMENTS This SR verifies that the CST contains the required volume of cooling water. The required volume of cooling water in CST T-121 is 144,000 gallons. That corresponds to 96%. The recuired volume of cooling water in_ CST _T-120 is 200,000

- l 360,000 gallons abbve?thectank's'zero! datum. That corresponds to spproximately!81[of ~useablejj61umelaticietthe zero ,s datum. The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is based on operating experience, and the need for operator awareness of unit evolutions that may affect the CST inventory between checks. l The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is considered adequate in view of other indications in the control room, including alarms, to alert the operator to abnormal CST level deviations.

REFERENCES 1. UFSAR, Section 9.2.6.

2. UFSAR, Chapter 3 i 3. UFSAR, Chapter 6.

i 4. UFSAR, Chapter 15.

SAN ONOFRE--UNIT 3 B 3.7-38 Amendment No. 115 05/30/97 l

PCN-499 l

ATTACHMENT "E" (Proposed Technical Specification and Bases Pages)

Unit 2 l

1 1

CST T-121 and T-120 3.7.6 3.7 PLANT SYSTEMS 3.7.6 Condensate Storage Tank (CST T-121 and T-120)

LC0 3.7.6 The CST T-121 contained volume shall be 2 144,000 gallons and CST T-120 contained volume shall be > 360,000 gallons. l APPLICABILITY: MODES 1, 2, and 3, MODE 4 when steam generator is relied upon for heat removal.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. CST T-121 or T-120 A.1 Verify 0PERABILITY of 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months contained volumes not backup water supply.

within limit. ARQ Once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter AHQ A.2 Restore CST T-121 and 7 days T-120 contained volumes to within limit.

B. Required Action and B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time not met. ARQ B.2 Be in MODE 4 without 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months reliance on steam generator for heat removal.

l l

l l SAN ON0FRE--UNIT 2 3.7-16 i

CST T-121 and T-120 B 3.7.6 B 3.7 PLANT SYSTEMS B 3.7.6 CondensateStorageTank(CSTT-121andT-120)

BASES BACKGROUND The CST provides a safety grade source of water to the steam generators for removing Reactor Coolant System RCS).(decayTheandCST sensible heat provides from the a passive flow of water, by gravity, to the Auxiliary Feedwater (AFW)

System (LC0 3.7.5, " Auxiliary feedwater (AFW) System"). The steam produced is released to the atmosphere by the main !

steam safety valves (MSSVs) or the atmospheric dump valves, l The AFW pumps operate with a continuous recirculation to the i CST.

When the main steam isolation valves are open, the preferred means of heat removal is to discharge steam to the condenser by the nonsafety grade path of the steam bypass valves. The i l condensed steam is returned to the CST. This has the i l advantage of conserving condensate while minimizing releases ;

l to the environment. '

l Because the CST is a principal component in removing l residual heat from the RCS, it is designed to withstand l earthquakes and other natural phenomena.

i CST T-121 is the suction source for the three AFW pumps. It '

is designed to Seismic Category I requirements and enclosed in a Seismic Category I vault that provides protection against earthquakes and other natural phenomena. CST T-120 l is not Seismic Category I, but is enclosed in a Seismic i Category I structure designed to retain water following an

! earthquake and to 3rotection against other

! natural phenomena.CST provide T-121 limited can 3e isolated by Seismic

! Category I isolation valves. The minimum required volume specified by LC0 3.7.6 ensures that, when S2-1414-MU-092 is isolated within 30 minutes and 2-HV-5715 is isolated within 90 minutes following an Operating Basis Earthquake, l sufficient inventory remains in T-120 to meet the

! reguirements described in the Applicable Safety Analysis.

l Seismic Category I makeup to CST T-121 is provided by gravity feed through cross-ties from T-120 and the T-120 l enclosure. Following a tornado event, sufficient inventory i remains in T-120 such that water from the T-120 enclosure (which may contain debris) would not be needed.

Backup water supplies are available via non-Seismic Category I makeup to CST T-121 and T-120. Normal makeup is provided by gravity feed from the High Flow Makeup Demineralizer 4 (HFMUD) tanks. Makeup may also be provided by the Units 2 i

(continued)

SAN ON0FRE--UNIT 2 B 3.7-35

1 CST T-121 and T-120 B 3.7.6 ,

l BASES ,

I l BACKGROUND and 3 Fire Water Pumps from the Units 2 and 3 Fire I (continued) WaterTanks,bygravityfeedortheUnit1FireWa/ Service ter Pumps l from the Unit 1 Service Water Reservoir, or by the Condensate Transfer System between Units 2 and 3. However, the water volume required in the other unit's CST by the other unit's Technical Specifications is not available as a backup supply.

1 A description of the CST is found in the UFSAR, Section 9.2.6 (Ref. 1).

APPLICABLE The CST provides cooling water to remove decay heat SAFETY ANALYSES and to cool down the unit following all events in the accident analysis (except Large Break LOCA), discussed in the UFSAR, Chapters 3, 6 and 15 (Refs. 2, 3, and 4 respectively). For anticipated operational occurrences and accidents which do not affect the OPERABILITY of the steam generators, the analysis assumption is generally 30 minutes ,

at MODE 3, steaming through the MSSVs followed by a cooldown l using the ADVs to shutdown cooling (SDC) entry SAFE '

ANALYSES conditions at the design cooldown rate.

The limiting event for the condensate volume is the Reactor l l Systems Branch Technical Position 5-1 (RSB 5-1) safe '

shutdown scenario. For the RSB 5-1 scenario, safe shutdown must be demonstrated using only safety grade systems,

! assuming a coincident loss of onsite or offsite power, and a concurrent single failure. For sizing of the cundensate

! volume, 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of steaming are assumed, including 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months at hot standby prior to initiating cooldown. Additionally, calculated losses over a 30-minute period prior to isolation of S2-1414-MU-092 and a 90-minute period prior to isolation of 2-HV-5715 are considered in the sizing of the volume.

An additionaI allotment of 32,616 gallons is included for future allocations to provide for any "as yet" unidentified uses or losses. The limiting single failures for the l RSB 5-1 scenario are:

l a. Failure of an Atmospheric Dump Valve on one steam generator. This limits the steaming rate and prolongs the cooldown to Shutdown Cooling entry conditions.

This is the most limiting failure for condensate s1 zing, r b. Failure of one Diesel Generator. This limits the l available cooldown rate from Shutdown Cooling entry to cold shutdown. This is the most limiting failure for time to cold shutdown.

The CST satisfies Criterion 3 of the NRC Policy Statement.

l (continued)

)

l SAN ON0FRE--UNIT 2 B 3.7-36

CST T-121 and T-120 B 3.7.6 BASES ACTIONS. B.1 and B2 2 If the CST cannot be restored to OPERABLE status within the associated Completion Time, the unit must be placed in a MODE in which the LC0 does not apply. To achieve this status, the unit must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 4, without reliance onsteam generator for heat removal, within 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full aower conditions in an orderly manner and without cla11enging unit systems.

SURVEILLANCE SR 3.7.6.1 REQUIREMENTS This SR verifies that the CST contains the required volume of cooling water. The required volume of cooling water in CST T-121 is 144,000 gallons. That corresponds to 96%. The required volume of cooling water in CST T-120 is 360,000 gallons above the tank's zero datum. That corresponds to aaproximately 81% of useable volume above the zero datum.

T1e 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is based on operating experience, and the need for operator awareness of unit evolutions that may affect the CST inventory between checks. The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is considered adequate in view of other indications in the control room, including alarms, to alert the operator to abnormal CST level deviations.

REFERENCES 1. UFSAR, Section 9.2.6.

2. UFSAR, Chapter 3

3. UFSAR, Chapter 6.

4. UFSAR, Chapter 15.

SAN ON0FRE--UNIT 2 B 3.7-38

PCN-499 l

l l

ATTACHMENT "F" l

(Proposed Technical Specification and Bases Pages) l 1

Unit 3 1

l t

l

CST T-121 and T-120 3.7.6 3.7 PLANT SYSTEMS 3.7.6 Condensate Storage Tank (CST T-121 and T-120)

LC0 3.7.6 The CST T-121 contained volume shall be > 144,000 gallons and CST T-120 contained volume shall be 2 360,000 gallons. l APPLICABILITY: MODES 1, 2, and 3, MODE 4 when steam generator is relied upon for heat removal.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. CST T-121 or T-120 A.1 Verify 0PERABILITY of 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months contained volumes not backup water supply.

within limit. M Orce per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter M

A.2 Restore CST T-121 and 7 days T-120 contained volumes to within limit.

B. Required Action and B.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time not met. M B.2 Be in MODE 4 without 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months reliance on steam generator for heat removal.

l l

l SAN ON0FRE--UNIT 3 3.7-16

.- . _ - - _ _ _ - . . ~ . _ _ . - - - - - . - . - -.. - -

I l

CST T-121 and T-120 1 B 3.7.6 B 3.7 PLANT SYSTEMS

< 1 B 3.7.6 Condensate Storage Tank (CST T-121 and T-120) l 1

3 BASES !

l BACKGROUND The CST provides a safety grade source of water to the steam

- generators Reactor Coolant for removing (decayThe System RCS). and sensible CST heat provides a passivefrom the flow of water, by gravity, to the Auxiliary Feedwater (AFW)

System"). The System (LCO 3.7.5, steam produced " Auxiliary is released to the atmosphereFeedwater (AFW)by the main steam safety valves (MSSVs) or the atmospheric dump valves. i

The AFW pumps operate with a continuous recirculation to the '

CST.

When the main steam isolation valves are open, the preferred means of heat removal is to discharge steam to the condenser by the nonsafety grade path of the steam bypass valves. The condensed steam is returned to the CST. This has the advantage of conserving condensate while minimizing releases to the environment.

i Because the CST is a principal component in removing residual heat from the RCS, it is designed to withstand earthquakes and other natural phenomena.

CST T-121 is the suction source for the three AFW pumps. It is designed to Seismic Category I requirements and enclosed in a Seismic Category I vault that provides protection against earthquakes and other natural phenomena. CST T-120 is not Seismic Category I, but is enclosed in a Seismic Category I structure designed to retain water following an earthquake and to provide limited )rotection against other natural phenomena. CST T-121 can 3e isolated by Seismic Category I isolation valves. The minimum required volume specified by LC0 3.7.6 ensures that, when S3-1414-MU-092 is isolated within 30 minutes and 3-HV-5715 is isolated within 90 minutes following an Operating Basis Earthquake, sufficient inventory remains in T-120 to meet the requirements described in the Applicable Safety Analysis.

Seismic Category I makeup to CST T-121 is provided by gravity feed through cross-ties from T-120 and the T-120 enclosure. Following a tornado event, sufficient inventory remains in T-120 such that water from the T-120 enclosure (which may contain debris) would not be needed.

Backup water supplies are available via non-Seismic Category I makeup to CST T-121 and T-120. Normal makeup is provided by gravity feed from the High Flow Makeup Demineralizer (HFMUD) tanks. Makeup may also be provided by the Units 2 (continued)

SAN ON0FRE--UNIT 3 B 3.7-35

CST T-121 and T-120 B 3.7.6 BASES I

l l BACKGROUND and 3 Fire Water Pumps from the Units 2 and 3 Fire / Service 1 (continued) Water Tanks, by gravity feed or the Unit 1 Fire Water Pumps from the Unit 1 Service Water Reservoir, or by the Condensate Transfer System between Units 2 and 3. However, the water volume required in the other unit's CST Ly the other unit's Technical Specifications is not available as a backup supply.

A description of the CST is found in the UFSAR, Section 9.2.6 (Ref. 1).

APPLICABLE The CST provides cooling water to remove decay heat SAFETY ANALYSES and to cool down the unit following all events in the accident analysis (except Large Break LOCA), discussed in the UFSAR, Chapters 3, 6 and 15 (Refs. 2, 3, and 4 respectively). For anticipated operational occurrences and accidents which do not affect the OPERABILITY of the steam generators, the analysis assumption is generally 30 minutes at MODE 3, steaming through the MSSVs followed by a cooldown l using the ADVs to shutdown cooling (SDC) entry SAFETY ANALYSES conditions at the design cooldown rate.

The limiting event for the condensate volume is the Reactor Systems Branch Technical Position 5-1 (RSB 5-1) safe shutdown scenario. For the RSB 5-1 scenario, safe shutdown must be demonstrated using only safety grade systems, ,

assuming a coincident loss of onsite or offsite power, and a i concurrent single failure. For sizing of the condensate volume, 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of steaming are assumed, including 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months at hot standby prior to initiating cooldown. Additionally, calculated losses over a 30-minute period prior to isolation ;

of S3-1414-MU-092 and a 90-minute period prior to isolation of 3-HV-5715 are considered in the sizing of the volume.

Anadditionaiallotmentof32,616gallonsisincludedfor future allocations to provide for any "as yet" unidentified uses or losses. The limiting single failures for the RSB 5-1 scenario are: '

a. Failure of an Atmospheric Dump Valve on one steam generator. This limits the steaming rate and prolongs the cooldown to Shutdown Cooling entry conditions. l This is the most limiting failure for condensate sizing.

b. Failure of one Diesel Generator. This limits the available cooldown rate from Shutdown Cooling entry to

! cold shutdown. This is the most limiting failure for time to cold shutdown.

The CST satisfies Criterion 3 of the NRC Policy Statement.

(continued)

SAN ONOFRE--UNIT 3 8 3.7-36 l

. .- - . . - _ . _ - .- _.- - . . -~ - . .-.- - - . - _ -

CST T-121 and T-120 8 3.7.6 BASES ACTIONS B.1 and B.2 If the CST cannot be restored to OPERABLE status within the associated Completion Time, the unit must be placed in a MODE in which the LCO does not apply. To achieve this status, the unit must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 4, without reliance onsteam generator for heat removal, within 18 hours2.083333e-4 days 0.005 hours 2.97619e-5 weeks 6.849e-6 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full )ower conditions in an orderly manner and without cla11enging unit l

systems.

SURVEILLANCE SR 3.7.6.1 REQUIREMENTS This SR verifies that the CST contains the required volume of cooling water. The required volume of cooling water in CST T-121 is .'.44,000 gallons. That c,orresponds to 96%. The required volume of cooling water in CST T-120 is 360,000 gallons above the tank's zero datum. That corresponds to a) proximately 81% of useable volume above the zero datum.

l T1e 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is based on operating experience, and the need for operator awareness of unit evolutions that may i affect the CST inventory between checks. The 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months Frequency is considered adequate in view of other indications in the control room, including alarms, to alert ,

the operator to abnormal CST level deviations. '

l REFERENCES 1. UFSAR, Section 9.2.6.

2. UFSAR, Chapter 3

3. UFSAR, Chapter 6. ,

4. UFSAR, Chapter 15.

l l

r SAN ON0FRE--UNIT 3 B 3.7-38 l

1

l PCN-499 i

l ATTACHMENT "G" Calculations (BTP RSB 5-1 Condensate Inventory) 1 l

l

{

l

ML20206R280

Text

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