ML20206R276
| ML20206R276 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/11/1999 |
| From: | Nunn D SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML20206R274 | List: |
| References | |
| NUDOCS 9901190221 | |
| Download: ML20206R276 (18) | |
Text
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t UNITED STATES OF AMERICA 3
NUCLEAR REGULATORY COMMISSION Application of SOUTHERN CALIFORNIA
)
EDIS0N COMPANY, E AL. for a Class 103
)
Docket No. 50-361 License to Acquire, Possess, and Use
)
a Utilization Facility as Part of
)
Amendment Application Unit No. 2 of the San Onofre Nuclear
)
No. 185 Generating Station
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SOUTHERN CALIFORNIA EDIS0N COMPANY, E AL. pursuant to 10 CFR 50.90, hereby submit Amendment Application No. 185. This amendment application consists of Proposed Technical Specification Change Number 499 to Facility Operating License NPF-10.
Proposed Technical Specification Change Number 499 is a request to revise Technical Specification (TS) 3.7.6, " Condensate Storage Tank (CST T-121 and T-120)" and the associated Bases to increase the required water volume in CST T-120 from 280,000 to 360,000 gallons.
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i 9901190221 990111 I i
PDR ADOCK 05000361 P
PDR_
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Subscribed on this day of c lt tdf ( A 1999.
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Respectfully submitted, SOUTHERN CALIFORNIA EDIS0N COMPANY
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l By:
-- kk-v Dwight E. Nunn )
Vice President State of California shp County of San tego On U
befoemeh
((UN personally appeared b)ld b-d^-
~^"^d
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,p ly known to me on+hebesise+satisfactnryevidence).tobethepersonkwhosenameK isfe*e.subscribedtothewithininstrumentandacknowledgedtomethat hefthef%ey executed the same in his/her/+ hair authorized capacity s),and that by his/htr/thef u ignature n the instrument the person or the entity upon behalf of which the per on cted, executed the instrument.
WITNESS my hand and official seal.
MAR ANE SANCHi2
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t Commission # I 196482 j!
No'ay PubGc - Coffomic h Signatu 1
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f son Diego County MyComm.EgiesOct RZE2 [
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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION Application of SOUTHERN CALIFORNIA
)
EDIS0N COMPANY, H R. for a Class 103
)
Docket No. 50-362 License to Acquire, Possess, and Use
)
a Utilization Facility as Part of
)
Amendment Application Unit No. 3 of the San Onofre Nuclear
)
No. 171.
Generating Station
)
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SOUTHERN CALIFORNIA EDIS0N COMPANY, H R. pursuant to 10 CFR 50.90, hereby submit Amendment Application No. 171.
This amendment application consists of Proposed Technical Specification Change Number 499 to Facility Operating License NPF-15.
Proposed Technical Specification Change Number 499 is a request to revise
)
Technical Specification (TS) 3.7.6, " Condensate Storage Tank (CST T-121 and T-120)" and the associated Bases to increase the required water volume in CST T-120 from 280,000 to 360,000 gallons.
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Subscribed on this day of L j k h ll M L4, 1999.
J Respectfully submitted, SOUTHERN CALIFORNIA EDIS0N COMPANY
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By:
/
_ b- -
DwightE.Nunn)
Vice President State of California On b fore me, N
M b k, pe s n appeared b, Iq k b -
1, M N ally known to me ( e p,v ed to me of cat (3fggtg,y crHence) to be the person'(5{ whose namelQ gn thn hseic isfare subscribed to the within instrument and acknowledged to me that he/&hefther-executed the same in his/heefthe+r authorized capacity % and that by his/hac/1hein signatureM on the instrument the person % or the entity upon behalf of which the person acted, executed the instrument.
WITNESS my hand and official seal.
Q MARtANE SANCHEI Commission #119W dk _M dv oC ty Signature v
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WComm.Emires Oct 14,ZD2 4
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DESCRIPTION AND SAFETY ANALYSIS 0F PROPOSED CHANGE NPF-10/15-499 This is a request to revise Technical Specification 3.7.6, " Condensate Storage Tank (CST T-121 and T-120)" and the associated Bases to increase the required water volume for CST T-120 from 280,000 to 360,000 gallons.
Existina Technical Snecifications and Bases:
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Unit 2:
See Attachment "A" Unit 3:
See Attachment "B" l
Pronosed Technical Snecifications and Bases:
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Unit 2:
See Attachment "C" (red line and strike out) l Unit 3:
See Attachment "D" (red line and strike out)
Pronosed Technical Snecifications and Bases:
Unit 2:
See Attachment "E" f
Unit 3:
See Attachment "F" i
l Condensate Storaae Tank Volume Reauirement Calculations Units 2 and 3:
See Attachment "G" Descrintion of Chanaes
]
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Background:
System DescriotiOR Condensate Storage Tank (CST) T-120 has a capacity of 500,000 gallons.
It is designed to comply with Seismic Category II requirements.
It has a limited tornado missile exposure above the enclosure wall.
Loading due to transient depressurization under a tornado event is reduced by vents incorporated into the tank design.
This tank serves a variety of non-safety related plant services and systems, including supply and receipt of condensate as required for the condenser hotwell, low-pressure turbine spray system, the blowdown processing system, and the turbine plant cooling water tank.
The important safety function of CST T-120 is to contain sufficient water for extended use of the Auxiliary Feedwater System (AFWS).
The water in T-120 can be gravity fed to T-121 through a seismically qualified line (including downcomer within the tank) by opening a normally closed 8" valve within the T-121 enclosure. The "0" datum gauging elevation for T-120 is defined as the bottomoftheT-120/T-121crosstienozzle.
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l Seismic failure of this tank is considered in determining the water available l
for possible extended cooldown times following a Design Basis Earthquake l
(DBE). The tank is surrounded by a structural enclosure designed to Seismic i
Category I requirements.
In the event of failure of CST T-120, the enclosure j
provides a basin for storage of the tank water. To serve as a seismically i
assured source of water for additional AFW supply, this enclosure has seismically su) ported piping (including II/I seismic design) leading from the enclosure to tie primary Condensate Storage Tank, T-121.
In addition, the portion of the lines that lead from T-120 to the secondary plant are Seismic Category I (or II/I) supported from the enclosure wall up to (and including) manual isolation valves HV-5715 and MU-092.
Piping downstream of these valves is non-seismic. This enclosure and the associated gravity feed piping are considered in the boundary of the AFWS. Gravity serves as the motive force for feeding this water to CST T-121 upon opening manually operated valves in the Seismic Category I piping provided.
This water increases the time available for continuous use of the AFWS for extended periods to meet the San Onofre Nuclear Generating Station (SONGS) Units 2 and 3 24-hour AFW pump l
operation water storage commitment.
I CST T-120 is enclosed in a Seismic Category I concrete structure designed to l
retain a majority of the water from the tank should the tank fail during a seismic event. T-120 provides makeup to Seismic Category I CST T-121 via the condensate transfer pump, or gravity feed through a crosstie line.
In the event of the failure of T-120, another crosstie line is provided from the T-120 enclosure to T-121.
Figures 1 and 2 provide diagrams of the Condensate Storage and Transfer System.
As stated above, CST T-120 is also a water supply or makeup source for the main condensers and other secondary plant equipment.
The portion of the lines that lead from T-120 to the secondary plant are Seismic Category I from the i'
enclosure wall to (and including) manual isolation valves HV5715 and MUO92.
Piping downstream of these valves is non-seismic.
HV5715 and MUO92 are normally open.
j Licensina Basis Hitlary Revision 0 (January 1984) of Updated Final Safety Analysis Report (UFSAR) section 9.2.6.1 " Design Bases" of the condensate storage and transfer system, includes:
"The condensate storage and transfer system provides water to the i
suction of the auxiliary feedwater pumps during normal startup and shutdown and during loss of offsite power conditions, as well as during loss of feedwater and steam line rupture. The Seismic Category I condensate storage tank T-121 has sufficient storage capacity to maintain a hot standby condition for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, and to provide enough water to remove decay heat and to cool down the reactor to the temperature at which the shutdown cooling system can be used to remove decay heat. An additional minimum 200,000 gallons available from the non-Seismic Category I condensate storage tank T-120 provides a total capability of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of auxiliary feedwater pump operation."
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"The Seismic Category I condensate storage tank T-121 will remain functional after the DBE.
Ir. addition, a minimum usable volume of 200,000 gallons from the Seismic Category II condensate storage tank T-120 will be available af ter the DBE."
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Technical Specification (TS) 3.7.1.3 has required 280,000 gallons in T-120 in Modes 1, 2, and 3.
The 80,000 gallons difference between the TS and the design bases accounted for some water volume in the tank which would be unavailable for plant cooldown following a Design Basis Earthquake (DBE).
The Bases for TS 3.7.1.3 (Unit 2, Amendment 99) states, in part, that the 280,000 gallons of water in T-120, in conjunction with 144,000 gallons of water in T-121, " ensures that sufficient water is available to maintain the
[ Reactor Coolant System] at H0T STANDBY conditions for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> including cooldown to shutdown cooling initiation, with steam discharge to atmosphere with concurrent loss of offsite power and most limiting single failure."
The limiting event for the condensate volume is the Reactor Systems Branch Technical Position 5-1 (RSB 5-1) Design Requirements of the Residual Heat Removal System safe shutdown scenario.
The limiting single failure for condensate sizing is the failure of an Atmospheric Dump Valve (ADV) on one steam generator. This limits the steaming rate and prolongs the cooldown to Shutdown Cooling (SDC) entry conditions.
RSB 5-1 (G) " Auxiliary Feedwater Supply" states "The seismic Category I water supply for the auxiliary feedwater system for a PWR shall have sufficient inventory to permit operation at hot shutdown for at least 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, followed by cooldown to the conditions permitting operation of the RHR system." [ Shut Down Cooling for San Onofre Units 2 & 3].
"The inventory needed for cooldown shall be based on the longest cooldown time needed with either only onsite or l
only offsite power available with an assumed single failure." SONGS 2 and 3
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satisfied this guidance by providing sufficient water in CST T-120 for 24-hour i
AFW pump operation as stated in the UFSAR.
l In the Safety Evaluation Report (NUREG-0712) issued by the NRC, the last paragraph of Section 9.2.4 states:
"We require that the applicants provide an assured condensate supply sufficient for maintaining the plant at hot standby for four hours followed by cooldown to 350 F with a failure of one power operated relief valve.
During the course of our review, we informed the applicants that a total of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of assured water supply i
(approximately 350,000 gallons) would be acceptable.
This requirement necessitates the use of approximately 200,000 gallons of the condensate l
contained in the non-seismic Category I tank. The applicants asserted l
that, in the event of the SSE, the condensate would be retaineJ by the seismic Category I wall. We questioned the water retaining capability of the concrete wall surrounding the 500,000 gallon tank over s 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period after the SSE, since cracks could form as a result of the earthquake.
We also require demonstration that tornado generated missiles will not prevent utilization of the tank contents for safe cooldown.
To show that San Onofre 2 and 3 meet our requirements, the applicants submitted a report titled " Watertight Reliability of Condensate Storage Tank and Its Concrete Enclosure Walls under DBE and Tornado Effects," September 1980, followed by supplemental information transmitted in December 1980. Our review of the applicants' analyses is
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given below."
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In February 1995, the Southern California Edison Company (SCE) took a mechanistic approach and questioned whether the current licensing basis included certain potential events which might reduce the volume of water available in T-120 following a DBE, and whether the water volume should be increased to include these events: specifically, potential inventory losses due to the failure of non-Seismic Category I piping downstream of the tank's Seismic Category I isolation valves, and seismically induced spurious actuation of non-1E electrical equipment (valves and pumps). SCE initiated an evaluation to determine these losses. This evaluation of T-120 losses identified that the 280,000 gallon TS limit for T-120 and plant procedures were not adequate to ensure meeting the 200,000 gallon design bases requirement described in the UFSAR.
In February 1996, SCE took actions to:
e Increase the minimum level in T-120 administrative 1y to 86.2 percent level (382,207 gallons).
This administrative level limit included an allowance for 30 minutes of diversion at the maximum estimated rate, plus level instrument total loop uncertainty (TLU).
This ensured that operators had at least 30 minutes to isolate the diversion flows prior to reaching the TS required level.
Revise operating procedures and Abnormal Operating Instructions (A01).
(See LER 2-1998-009, Rev. 1.) The revisions included:
j 1.
Requiring shiftly surveillance that the level in T-120 is above the new minimum level.
2.
Inspecting and, if necessary, closing the condenser makeup water valves, and de-energizing and isolating the condensate transfer pump within 30 minutes of a seismic event larger than the Operating Bases Earthquake (0BE).
3.
Requiring closing one unit's Turbine Plant Cooling Water (TPCW) makeup isolation valve, or maintaining an Operator in attendance whenever the unit's condensate makeup systems are crosstied to the other unit.
In November of 1998, this issue became a subject of the Safety System Engineering Inspection.
U.S. NRC inspectors reviewed a draft of this amendment application and the calculations which are provided in Attachment "G".
On January 4,1998 [ SIC], Inspection Report 98-14 was issued by the U.S. NRC.
Item E8.1 discusses the inspection Team's findings regarding condensate storage.
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Discussion 7
Documentation SuoDortina the Minimum Volume SCE recently completed the calculations (provided in Attachment G) and determined that this proposed TS change is required to incorporate the Administrative Water Volume increase implemented as a compensatory measure by Licensee Event Report 2-1996-012 (Reference).
Based on these calculations SCE has determined that 360,000 gallons of water is required to be maintained in CST T-120 to ensure that 200,000 gallons of water would be available to meet the Reactor Systems Branch Technical Position 5-1 guidance, assuming a 30-minute allowance to isolate MU-092 and a 90-minute allowance to isolate HV-5715, thus isolating CST T-120 from all non-Seismic Category I piping.
The 360,000 gallon limit includes an allotment of water (37,616 gallons) which SCE may allocate to future "as yet unidentified" usages and/or losses.
The purpose of the calculation was to determine if condensate storage l
inventory requirements from seismically qualified sources meet SONGS Units 2 and 3 commitments to the guidance of NUREG-0800, Branch Technical Position RSB 5-1, " Design Requirements Of The Residual Heat Removal (RHR) System."
This calculation also determined the inventory margin available from Condensate Tank T-120 for the limiting RSB 5-1 scenario by comparing the required volume of water in T-120 to the minimum volume of water maintained in i
this tank as a result of Technical Specification (TS) requirements.
i Conclusion The minimum required volume in T-120 above the tank's zero datum is 327,384 gallons, assuming operator action within 30 minutes after a DBE to isolate MU-092, and assuming operator action within 90 minutes after a DBE to l
isolate HV-5715.
The recommended TS volume is 360,000 gallons, which includes l
32,616 gallons of available margin that can be allocated as required, should a future inventory concern occur.
These results are detailed in Table 1 and are l
graphically illustrated on Figure 3.
Additionally, the Technical Specification Bases is being revised to clearly indicate the commitment to provide an assured volume of water for 24-hour AFW pump operation, the manual operations required to preserve that volume, and the available margin for future allocations.
Reference:
Letter from R. W. Krieger (SCE) to the Document Control Desk (NRC) dated May l
29, 1998;
Subject:
Docket No. 50-361 and 50-362, 30-Day Report, Licensee Event Reports No. 2-1996-012 and 1998-009, San Onofre Nuclear Generating Station, Units 2 and 3.
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No Significant Hazards Considerations:
The Commission has provided standards for determining whether a significant hazards consideration exists as stated in 10 CFR 50.92. A proposed amendment to an operating license for facility involves no significant hazards consideration if operation of the facility in accordance with a proposed amendment would not:
(1) involve a significant increase in the probability or consequences of an accident previously evaluated; or (2) create the possibility of a new or different kind of accident from any accident previously evaluated; or (3) involve a significant reduction in a margin of safety. A discussion of these standards as they relate to this amendment request follows to show that operation of the facility in accordance with this proposed amendment does not:
1.
Involve a significant increase in the probability or consequences of an accident previously evaluated?
Response: No The purpose of the increased water volume is to ensure that the required volume of water preserved by Technical Specification 3.7.6 is sufficient to meet the San Onofre Units 2 and 3 Licensing and Design Basis. To meet the guidance of Reactor Systems Branch Technical Position RSB-5-1, the Southern California Edison Company (SCE) committed to provide an assured source of water for 24-hour Auxiliary Feedwater (AFW) pump operation. This requirement necessitates the use of approximately
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200,000 gallons of water from Condensate Storage Tank (CST) T-120.
Revising the minimum water level will not initiate an accident.
l Therefore, increasing the minimum water level in T-120 from 280,000 gallons to 360,000 gallons will not increase the probability of an accident, and the requirement for 360,000 gallons ensures the required 200,000 gallons of water will be available when the current required level does not provide that assurance.
Therefore, this change does not involve a significant increase in the probability or consequences of any accident previously evaluated.
i 2.
Create the possibility of a new or different kind of accident from any accident previously evaluated?
Response
No Increasing the minimum water volume required in a 500,000-gallon tank from 280,000 gallons to 360,000 gallons will not initiate any accident.
l Therefore, this change does not create the possibility of a new or different kind of accident from any previously evaluated.
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3.
Involve a significant reduction in a margin of safety?
Response: No The margin of safety intended by the original 280,000 gallon requirement was to ensure that following a Design Basis Earthquake (DBE) CST T-120 would have at least 200,000 gallons to meet Southern California Edison's (SCE's) commitment to RSB-5-1.
Raising the minimum volume to 360,000 gallons to account for calculated water losses, with additional allotment for future allocations, increases the margin above the 200,000 gallons and therefore increases the assurance that the RSB-5-1 commitment is met, i
Therefore, this change does ng involve a significant reduction in a margin of safety.
j Based on the responses to these three criterion, Southern California Edison (SCE) has concluded that the proposed amendment involves no significant hazards consideration.
Environmental Consideration:
SCE has determined that the proposed amendment involves no changes in the amount or type of effluent that may be released offsite, and results in no I
increase in individual or cumulative occupational radiation exposure. As l
described above, the proposed TS amendment involves no significant hazards i
consideration and, as such, meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9)..
FIGURE 1:
CONDENSATE 4
-w TO LT32041% H LC TO LT4354 FIREWATER I
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TO LT4355 PUMP HEADER TO LT3204 2WH THROTTLED Q0_
2PI NUCLEAR SERVICE $
N2 wras k
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ta-1FT
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F03076
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-p:
4 AUXILIARY ty c
ATERdD L
435 FROM TANK TOPgl
( MINIMUM )
L 528 FLOW /
D 4
fT 2.
,M 0123232 g
UA g
pg g-ggg L 0 GTORAGE pgou 7Ag 5
AUXlLIARY 8 AUXILIARY FEE 82 4
P f40 FEEDWATER MgMM L0 Tt21 e
v AUX 1LIARY W
LT CR-53 O' PUMP P 141 l
@1 g L0 AUXILIARY e
gy W
}.C.
s Tf?o PUMP P 504 2
w, SUMP TO 3 1 1
P l
DRAIN m.
d b
TO TO u
Psg'Psg Pse Psg j; 32:3 LT LT 4357 4358 MM MM M4 M58 NUCLEAR THROTTLED Im SERVICE W 75 n2 m
F
, Mk 24-4 953 AUX!LIANY BOfLER 1FT FEEDWATER ge y
g 7 LOOP SEAL PUMP E0as
-=
X +LO 9
uAxE uP rROu DEM N IZER:
g X
a cggguP l
l FO3078
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p REHEATER W
ORAIN TANKS e STORAGE 71 MAIN CONOENS h
too con LC
( RT
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l N
l T120 g
7 ; TO ORAWf E 065 rytou t w fee hWN CONDENSER 6
MAKEUP O
d (SOUTH) l Li LT enu E 065 l
cs?
use EMERGENCY -
M TA p 14$
U U
u L439 d
Me 4M79 MFC v
pggh i
P'~ "'
_ RAGE AND TRANSFER SYSTE f.f4+7
- >4 g;~.
o ty 329
'd x
F.C.
LC 435 DEMINE IZER WATER STORAGE ANKS (HILL TANKS)
=a
@ FQ 7'
8 FC FT FI FQ1 4350 4350 435 m2 9 P FULL FLOW CONDENSATE
.042 s 6 POLISHING DEMINERALIZER l
4 s'H M N
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FROM TEMPORMY s
- DEMINERAllZER FC O
". TRANSFER PUMPS O(
CROSS TIE WITH UNIT 3 HYDRAZlNE TANKS T 108 & T 109 1
- TURBINE PLANT 7I
- COOLING WATER ScotAftfWOCROMTE SYSTEM CobTE SYSTEM AM EECTCRS
.[
LOOP SEAL FlLL
" "^
BLOWDOWN PROCESSING SYSTEM X
VACUUM BREAKERS l
SLUICE PUMPS MAJN CONDENSER E085 FO 3207 X
SEPARATOR TANK T132 gf
'I W
"/*
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PERMANENT TEMPORARY ss4 TO UNIT 1 ~
- J h
Pl TOHOSE TO CONDENSATE pst 320 ON TRANSFER HEADER" 333 *j
%N s
s HYDRAZINE TANK T 113 4
=
AMMONIA TANK T 211 l
C/
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T bP P
v, BLO WH PROCESSING i
- SLU UMPS P431 & P461 3 Watt.
bC b
1 tysm \\
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l 1414 - 018 - 6*
E Unit 3 Cross-tie 1414 - 022 - 6 y
Ammonia /
IIGEND:
Ilydr. Tanks E
To turbine P-145 Emerg. Spray Pump Controlvalve g
1414 - 016 - 3*
l Normally openisolaton vake 1414 - o20 "ITCW LV-6936 Tank i
Makeup to ciiier Norma!!y closedisolaton vake FC w
le14-005-s* B---
T-050 y
LV-5257 Makeup to Condenser Pump cI 1414-004-6* B---
"h LV-3258 I414-070-la m
Makeup to Condenser LoopSeal Fill a
1414-003-6* B---
M LV-3243 Makeup to Condenser MU-092 I414-046-4*
m
<D I4:4-002-6* B---
1 I Condensate LV-3259
<--- 1414-014-8" Fill C
b a
1414 - 019 - 2*
e Vac. Breaker g
<----- T120 Enctmure ic 1305 - 155 - 2*
2 Seal Wtrsupply la o
T-120 '
T-i32 g
1414 -001-3/4* 21 LCV-3321 Sep.
]
T-121
}
i4:4-ois-s ---->
Tank to 1414 - 033-I - l/2" MU-476 flydr. Tank TII3 7
IIV-57.15 irmra g
[-]
o MU-088 j
P-049 Amm.
nk T211 SUMP R l
il Transfer Pump 1414 - 043 - 6*
I To Slutce Pumps 1414 - 032 - 6*
m u.
__I Man vi,1 above reso datum o_wrthm 446,558 gal - If2(14cf 617)
Z h 447,415 gal-113(Ret. 616)
"T1 Volume too secondsry pierd use g"
c 7
< --- 18 20 Ensiosure wen Curteaa Admin Vol = 382207 aal (TYP)
W Recom T/5 Voheme = 360,000 gal (Instr.11.U + Admie Control)= 22,207 gal i
un 144.000 gal Margm far Futm.e leakage = 32,616 gal 8"5 N35G shrinkageloss = 9.052 gel e
os Logo _st_dowggh MU - 092 Imss due so TPCW11C imake=p = 62,900 gal L.asse_s _dgmetrjlV-37l3 for Rgeimates:
13dme sacriticaleract = 5.950 gal
[ag 29 g(egigg; I) Cendemner Makeup L_oes so the Separater Task = 450 gal
- 1) TrCW Task Makeup C
- 2) Emeg. Spey reap Seal Wang ones = 90s gol
- 2) Crisiesi crack o,
s
!**!!h'**E'! ^_M E***f parking = n3 tal
- 3) Separesor Teok e
l []944e-oonCl414-el4!s7
- 4) SealWats
~,
j l Il irecover. vol se T-520 eact = 2,96e set w
f l<-
t gg loss dee tacand makeup = 73,558 gal 1484 - 018 - 6*
a
-s lies ~tO Esmera. Spray reap = 4,450 gel y
System valve leakage = 8.3e0 gel Lasses through the enclosure = 3,000 gal g
t#l Reg'd volume is shutdoen = 200,000 gal As" (see Hote below) l cs Cms n ri M
l Og W-MApe Y
tamo DArune Irv-stts
[s4 0 - 476 Recoverable below
---> Q P-949 p
E <-----
l __ l< --
rero det. = 45,316 ast l
Ceed. Deest.reep p
g U esu-e51
-)
N sion:
g o
I neu-me l BINRECOVERABLE VOLUGAE) 1 T_ o 5Edeo Pumpe M-Note: While the Tech Spa & Adenia. Volumes are messwed from the acro detun,the steamble volume includes 45,316 recoverable getoes below the sete deten.
Water Volume Requirements Table 1 Description Gallons Note 1.
Useable volume in T-120 required for shutdown 200,000 2.
Losses through T-120 concrete enclosure 3,000 3
3.
System valve leakage 8,360 3
4.
Net SG shrinkage loss 9,052 5.
Line 1414-014-8"... loss due to the condenser 73,558 1
hotwell makeup 6.
Loss through Emergency Spray Pump P-145 4,410 1
7.
Loss due to critical crack 5,950 2
8.
Loss due to the Separator Tank T-132 makeup 450 2
9.
Loss due to the AFW pumps packing 1,080 3
- 10. Unrecoverable volume in T-120 enclosure 2,960
- 11. Loss due to makeup to TPCW Tank T-050 62,980 2
- 12. Losses due to water seals 900 2
- 13. Recoverable volume below T-120 zero datum (45,316) 5
- 14. Total required volume above zero datum 327,384
- 15. RECOMMENDED T.S. VOLUME AB0VE T-120 ZERO DATUM 360,000 4
Notes: See page 12.
4
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l Notes to Table 1:
1.
These losses are assumed isolatable in 30 minutes by operator action to j
close MU-092 following an OBE (or DBE).
I Further, normal isolation of flows from T-120 via closure of MU-092 (with operators standing by when opened) would eliminate losses for both items 5 & 6.
Under these conditions, the margins identified below, in Note 4, would increase in direct proportion to the reduction in losses.
2.
These losses are assumed isolatable in 90 minutes by operator action to close HV-5715 following an OBE (or DBE).
Further, normal isolation of flow from T-120 via closure of isolation valve 1414-MU-048 upstream of the TPCW tank makeup valve LV-6936 (with operators standing by when opened) would eliminate losses for item 11.
i Under this condition, the margins identified below, in Note 4, would l
increase in direct proportion to the reduction losser 3.
These losses are assumed for the duration of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
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4.
The 360,000 gallons includes an allotment of 32,616 gallons which may be used for future allocations.
5.
The Zero datum gauging elevation for CST-T-120 is defined as the bottom j
of the 2(3) T-120/2(3) T-121 crosstie nozzle.
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i k.
l PCN-499 ATTACHMENT A (Existing Technical Specification and Bases Pages)
SONGS Unit 2 o
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