ML20112D041
| ML20112D041 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/26/1995 |
| From: | Barbour P, Castello T, Evinay A SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML20112D021 | List: |
| References | |
| N-4080-003, N-4080-003-R05, N-4080-3, N-4080-3-R5, NUDOCS 9606040035 | |
| Download: ML20112D041 (125) | |
Text
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N-4080-003 Rev 5: Containment Spray and Emergency Cooling Unit Actuation Times (including CCNI) r,,'
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ICCN NO i
CALCULATION TITLE PAGE PAGE OF CCN CONVERSION:
I Calo. No.
N-4080-003 DCP/MMP/FIDCN/FCN No. & Rev.
N/A CCN NO. CCN-Subject Containment Spray (CS) and Emervency Cooline Unit (ECU) Actuation Times Sheet I
l System Number / Primary Sta'.lon System Designator 1206.1500/ BKA. GNF SONGS Unit 2/3 0-Class II Tech. Spec. Affecting? X NO O YES, Section No.
N/A Equipment Tag No.
N/A D PROGRAM PROGRAM / DATABASE NAME(S)
VERSION / RELEASE NO.(S)
CONTROLLED OG M/
O DATABASE DATABASE IN ACCORDANCE WITH NES&L 41-5-1 N/A N/A RECORDS OF ISSUES TOTAL REV.
PREPARED APPROVED CRim SMS DISC.
(Print name/ initial)
(Signature)
ORIG.
GS Other i
ORIGINAL ISSUE SEE BECHTEL CALC COVER SHEET IRE DM DATE BECH ORIO.
GS Other REVISIONS 1 THROUGH 4 SEE BECHTEL CALC COVER SHEET t......
IRE DM DATE BECH Complete revision - All sheets from 38 ORIG.
G Other Revs 0-4 replaced; includes 5 peig 37 Paul Barbo I
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I)l MSA revised spray piping fill analysis Allen Evinay 1
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IRE DM DATE Space for RPE Stamp, Identify use of an attemate calc., and notes as applicable.
Rrywon S.rapegseces cALCV M 77p N M- 0 0 M- 003, REv. O This calculation was typed using ' Word perfect 5.1" software as an electric typewriter. The WPS.1 software was not used for any computational portions of this calculation.
This calc. was prepared for the identified DCP/MMP. DCP completion and tumover acceptance to be verified by receipt of a memorandum directing DCN Conversion. Upon receipt, this calc. represents the as-built condition. Memo date by 4
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C
i NES&L DEPARTMENT CALCULATION SHEET "o '
PRELIM. CCN NO.
PAGE OF Project or DCP/MMP N/A Caic. No. N-4080-003 OCN CONVERSION:
CCN No. CCN -
Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
4 l
REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
M Paul Barbour 12/23/93 Allen Evinay 12/23/93 /\\
h A
A a
TABLE OF CONTENTS
.SECTION PAGE 1.0 PURPOSE.......................................5 2.0 RESULTS, CONCLUSIONS & RECOMMENDATIONS.......
6 3.0 ASS U M PTI O N S...................................
9 4.0 DESIG N IN P UT..................................
12 5.0 M ETH O D OLO GY.................................
14 6.0 R E FER E N C ES...................................
16 7.0 N O M E N C LATU R E................................
19 8.0 CALC U LATI O N S.................................
21 8.1 Emergency Cooling Units......................
21 8.1.1 ECU Actuation With No Loss of Offsite Power.......
21 8.1.2 ECU Actuation With Loss of Offsite Power..........
22 8.2 Containment Spray System.....................
25 8.2.1 CS Actuation With No Loss of Offsite Power........
25 l
8.2.2 CS Actuation With Loss of Offsite Power...........
26 8.2.3 Spray Piping / Header Filling.....................
29 APPENDICES Appendix A Gould-Brown Bovari Switchgear Division......
36 Bulletin 8.2-1E,"ITE Type HK Stored Energy Metal Clad Switchgear", Table 9, Page 43 [ Reference 6.4)
I Appendix B Amerace Corporation, Industrial Electrical.....
37 Products Division, Bulletin E70-1, "Agastat Nuclear j
Qualified Time Delay Relays", E7000 Series Operating Characteristics from Specifications on Page 4 [Ref. 6.25]
NES&L DEPARTMENT CALCULATION SHEET
' '" " $CN No.
eReu eAoE__ or.__
Project or DCP/MMP N/A Calc. No. N-4080-o03 CCN CONVERSION:
CCN NO. CCN -
Subject Containment Sprav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
5 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
/\\
Paul Barbour 12/23/93 Allen Evinay 12/23/93 /'\\
8 A
A s
1.0 PURPOSE The purpose of this calculation is to determine a conservative time interval between the occurrence of the design basis loss of coolant accident (LOCA) or main steam line break (MSLB) in containment and the time at which a single train of the containment spray (CS) system or a post accident emergency cooling unit (ECU) is fully functional for containment heat removal. The containment spray and emergency cooling unit delay times are determined with and without a loss of off-site power (LOOP).
This revision of the calculation specifically includes engineered safety features (ESP) analysis set points of 5 psig for safety injection and containment emergency cooling unit actuation and 20 psig for containment spray system actuation. This revision also specifically calculates a spray piping fill time consistent with the performance of a 7.5% degraded containment spray pump identified in calculation M-0014-009 [Ref. 6.1].
The results of this calculation are included in UFSAR Chapter 6, tables 6.2-30 and
-6.2-31, which present design basis delay times for containment heat removal system operation following a design basis LOCA or MSLB in containment. For conservar.sm, the delay times developed in this calculation are based on the containment pressure response to the design basis MSLB (main steam line break at 102% reactor power) since this accident provides a slower rate of containment pressure rise than does the design basis LOCA.
The delay times determined in this calculation provide a basis for modeling the start of containment heat removal systems in analyses to determine the containment pressure and temperature response to the design basis LOCA and MSLB events. These delay times are applicable only to large break events with containment pressure ramps that reach the containment high and high-high pressure analysis setpoints within the times used in this calculation.
In-containment high energy line break events which provide slower rates of containment pressurization should be individually evaluated for the timing of heat removal system operation using the methodology of this calculation, but based on a calculated break-specific time to reach the high and high-high containment pressure analysis setpoints.
This calculation revision is required to support closure of disposition step 2 of NCRs 93030001,2,3, and 4 [Ref. 6.7) by providing minimum CS and ECU start time data for use in revising the design basis LOCA and MSLB analyses of record.
NES&L DEPARTMENT CALCULATION SHEET gnet McN NO.
,,Aoe 0,
Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN NO. CCN -
Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
6 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
/\\
Paul Barbour 12/23/93 Allen Evinay 12/23/93 [\\
A A
1 2.0 RESULTS, CONCLUSIONS, AND RECOMMENDATIONS 2.1 Results The results of this calculation show that, following a design basis loss of coolant accident (DB LOCA) or a design basis main steam line break (DB MSLB), the containment emergency cooling units and containment spray system will be fully functional after the time intervals identified below. Delay times reflecting loss of offsite power (LOOP) and no loss of offsite power (no LOOP) are provided. For the LOOP case, the loss of power is assumed to occur at a point in time following the LOCA or MSLB such that the loss of voltage signal (LOVS) which starts the emergency diesel generator, occurs coincident with the generation of the safety injection actuation signal (SIAS) occurring on containment high pressure (SlAS/LOVS event). The values in brackets {} are the values of record from the previous revisions of this calculation.
SUMMARY
OF RESULTS Emeraency Coolina Unit and Containment Sorav Actuation Times No Loss of Power With Loss of Power Emergency Cooling Unit Delay Time (seconds) 15 {13}
34 {33}
Containment Spray Delay Time (seconds) 49 {46.6}
59 {55}
These delay times are specifically applicable to the DB LOCA (double-ended RCS suction leg slot break) or DB MSLB (steam line break at 102% power).
Containment high energy line break events which provide slower rates of containment pressurization than the DBA events cited should be individually evaluated for the timing of heat removal system operation using the methodology of this calculation, but based on break-specific times to reach the high and high-high containment pressure setpoints.
Timelines describing the sequence of events and individual delay times associated with each component of the overall actuation time are provided in Section 8 (Calculations) as Figures 1 and 2 on pages 24 and 28 for the emergency cooling units and the containment spray, respectively.
NES&L DEPARTMENT CALCULATION SHEET
'fng ccn no.
o g,o, og Project or DCP/MMP N/A Calc. No. N-4080-o03 CCN CONVERSION:
CCN No. CCN -
Subject Containment SDrav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
7 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
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Paul Barbour 12/23/93 Allen Evinay 12/23/93 [\\
h A
/\\
1 4
The change in analysis setpoint for containment high pressure from 4 psig to the currently used 5 psig [Ref. 6.2] had no effect on the delay time calculation. The l
2 seconds previously allowed for the containment pressure to reach the high pressure setpoint envelopes the higher setpoint.
i The 2-second increase in the delay time for emergency cooling unit operation with no LOOP is due to not crediting full operability until the component cooling water block valves to the fan cooler units are completely open versus 83% open at 13 seconds in the prior analysis.
1 l
The 1-second increase in the delay time for emergency cooling unit operation with LOOP is due to increasing the tolerance on the sequencing time delay relays for i
component cooling water pump start from 0.5 seconds to 1.5 seconds ( 10% of the 15-second delay setting).
The change in containment spray system flow rate to allow for up to 7.5% spray pump degradation [Ref. 6.1] increased the spray piping / header fill time by about 3.5 seconds which is the major contributor to the changes in spray start time.
j Minor changes in other components of the overall delay time for the spray system i
actuation, including a 10% uncertainty in the repeatability of sequencing the containment spray pump, also contributed to the differences in the results.
NES&L DEPARTMENT CALCULATION SHEET
!REu" " $CN NO.
PAGE OF Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN NO. CCN --
Subject Containment Sprav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
8 REV ORIGINATOR DATE 1RE DATE REV ORIGINATOR DATE 1RE DATE R
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Paul Barbour 12/23/93 Allen Evinay 12/23/93 [\\
r A
A a
2.2
. Conclusions & Recommendations The overall delay times employ constituent response times which are consistent or conservative with respect to Station response time and operability testing success criteria. Therefore, this calculation revision does not impact Station procedures.
The overall delay times from the prior revisions of this calculation are included in UFSAR table 6.2-30 and 6.2-31. Therefore, a UFSAR change request has been initiated to conform these tables to the current analysis of record.
The analyses of record for containment pressure and temperature response to the design basis LOCA and MSLB events [N-4080-026 and N-4080-027,Refs. 6.9 and 6.8, respectively] use emergency cooling unit and containment spray start times which conservatively envelope the values generated in this calculation. Therefore, these P/T calculations are not impacted by this revision.
The analysis of record for the containment P/T response to the design basis MSLB event for equipment qualification [N-4080-004, Ref. 6.23) used emergency cooling unit and spray start times which do not envelope the values in this calculation.
Calculation N-4080-004 is scheduled for revision as a disposition step of NCRs 93030001,2,3, and 4 [Ref. 6.7). The future revision of the MSLB P/T equipment qualification calculation willinclude emergency cooling unit and containment spray start times consistent with the current revision of this start time calculation.
Calculation M-0014-003 [Ref. 6.24) is an early analysis of the fill time for containment spray piping inside containment. The current piping fill analysis contained in this revision of the emergency cooling unit and containment spray system startup delay times supersedes the analysis in Reference 6.24, and that calculation will be obsoleted.
NES&L DEPARTMENT CALCULATION SHEET l Rsun $cN NO.
moe or
^
Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN NO. CCN -
Subject Containment Sorav (CS) & EmeraencV Coolina Unit (ECU) Actuation Times Sheet No.
9 A
REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
[5\\
Paul Barbour 12/23/93 Allen Evinay 12/23/03 A A
A a
3.0 ASSUMPTIONS 4
3.1 Instrument response and ESF signal generation time is assumed to be 1 second.
This value is consistent and conservative with respect to the ESF response times 1
calculated and used in the Plant Protection System Setpoint Calculation, CE-NPSD-570-P [Ref. 6.2]. According to sections 4.9 and 4.10 of Reference 6.2, the total ESFAS response time for either containment high pressure or high-high pressure is estimated to be 0.551 seconds, which is below the 1 second analysis i
response time assumed in this calculation. The 1-second response time also
{
coincides with the combined " sensor and ESF logic" and " subgroup relay" delay times identified in General Engineering Procedure SO23-XV-6, " Technical Specification Response Time Surveillance Implementing Procedure Master List" j
[Ref. 6.3]. The 1-second ESF response time used in this calculation and in Reference 6.2 is split in to the " sensor and ESF logic" and " subgroup relay" delay times to facilitate response time testing by the Reference 6.3 procedure.
3 l
3.2 Closing times for the electrical power breakers supplying the motors for the containment spray pumps, the component cooling water pumps and the i
emergency cooling unit fans are assumed to be included in the motor acceleration times identified in Design input items 4.7,4.8, and 4.9. The breaker closing time l
is normally a very short interval, and a typical value from vendor equipment catalog data (Ref. 6.4) shows closure times of about 4.5 cycles (0.075 seconds) for the SKv breakers used to supply the 4160 volt power to the component cooling water an.d containment spray pumps. Since the minimum motor acceleration times used l
in this calculation are at least 4 seconds and typically include margin above the j
expected acceleration times, the assumption that the motor acceleration times include a breaker closure time allowance of the order of 0.1 second is reasonable.
3.3 For the loss of offsite power case, the LOOP is assumed to occur at a finite time following the LOCA or MSLB such that the diesel start in response to the loss of j
voltage signal (LOVS) occurs coincident with the generation of the safety injection actuation signal (SIAS), a SIAS/LOVS event. Since, as identified in Design input 4.5, the bounding time for the containment pressure to reach the high pressure analysis setpoint of 5 psig is taken to be 2 seconds following either the design basis LOCA or MSLB event and the ESF delay time to generate the SIAS is assumed to be 1 second (Assumption 3.1, above), the diesel generators will be starting 3 seconds following the design basis pipe break event.
NES&L DEPARTMENT CALCULATION SHEET eneun $CN NO.
PAGE OF Project or DCP/MMP N/A Calc. No. N4080-003 CCN CONVERSION:
CCN NO. CCN -
Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
10 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE ICE DATE R
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Paul Barbour 12/23/93 Allen Evinay 12/23/93 [\\
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3.4 Consistent with vendor specifications for sequencing time delay relay repeatability i
of 10% of the Agastat relay setting as provided in Reference 6.25, conservative sequencing delays of 11 seconds (10 1 sec) and 16.5 seconds (15 1.5 sec) will be assumed for the containment spray pumps and component cooling water pumps, respectively. These delay times are conservative with respect to the acceptance criteria for sequence loading accuracy of 10% of the load block time interval ( 0.5 sec for load groups 2 through 4) as provided in the Reference 6.3 procedure.
3.5 The bounding time for the containment pressure to rise to the high pressure analysis setpoint of 5 psig following the design basis LOCA or MSLB pipe break event will be assumed to be 2 seconds. This time delay is based on the containment pressure response to the design basis steam line break event (MSLB at 102% power). For this break, the containment pressure has increased by 6.5 psi at 2 seconds following the break [Ref. 6.8]. For the design basis LOCA event, the containment pressure has increased by 11.7 psi at 2 seconds following the break [Ref. 6.9].
3.6 The bounding time for the containment pressure to rise to the high-high pressure analysis setpoint of 20 psig following the design basis LOCA or MSLB pipe break event will be assumed to be 9 seconds. This time delay is based on the containment pressure response to the design basis MSLB at 102% power. For this break, the containment pressure has increased by 20 psi at 8 seconds and by 21.8 psi at 9 seconds following the break [Ref. 6.8]. For the design basis LOCA event, the containment pressure has increased by 20 psi at about 4.1 seconds, and by 34 psi at 9 seconds following the break (Ref. 6.9].
3.7 The containment spray piping riser is assumed to be filled with water to within 10 feet of the lower (first) ring header as required by Technical Specification Surveillance Requirement 4.6.2.1.b.4 [Ref. 6.15]. The water level in the spray riser piping is established using Station Procedure 8023-3-3.11.2 [Ref. 6.16]
3.8 The containment spray headers are assumed to fill one at a time from the bottom ring to the top ring. As each spray ring is being filled, it is further assumed that the flow rate of water into the ring available to fill the ring is reduced by having each nozzle in the ring immediately begin leaking water at a flow rate set by an assumed water pressure in the ring of 5 psi above the containment pressure. This is a conservative assumption since the nozzles can only begin to leak water after the water reaches them, and the pressure driving the leakage would only be the static head at each nozzle location which, on average, would be expected to be
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less than the assurned 5 psi for the ring being filled. As the riser between the rings is filled, the full spray rings leak water at a flow rate consistent with the 5 psi assumed for the higher ring being filled plus the static pressure between the ring j
j being filled and the full ring below. The nozzle spray flow rate as a function of nozzle pressure drop is defined in Design input 4.11.
1 3.9 The filling of the spray headers will be assumed to start at the time the spray pump reaches full speed. The filling flow rate will be assumed to be 1900 gpm.
This value is conservatively chosen to be less than that calculated in Case 7 of Reference 6.1 (1933 gpm; see Design input 4.10). This flow rate is representative 1
of the minimum value during injection mode operation with the RWST full, the containment at the design pressure of 60 psig, the spray block valves full open, but without the full nozzle pressure drop as would be the case while the headers are filling. For the case of containment spray actuation with OLo LOOP, the spray block valves are only 67% open at the time the spray pump reaches full speed, and about 4 seconds remain before the block valves are full open (see section 8.2.1). Based on Case 5 of Reference 6.1, the filling f!ow rate with the valves half open would be greater than 1650 gpm, or 87% of the valves full open flow rate i
(1679 gpm is shown in Ref. 6.1). Using linear interpolation, the filling flow with the block valves 67% open would be about 91% of the maximum filling flow rate. The assumption of the maximum filling flow rate from the time the block valves are 67%
l open, with the spray pump at full speed, is justified since no credit is taken for the substantial amount of water which will enter the assumed empty portion of the riser during the 4 seconds that the pump is accelerating to full speed while the block valves are moving from about 33% open to 67% open. It is estimated that over 50 gallons of water would enter the assumed empty portion of the spray riser 1
system, which is enough to fill about 25 feet of the initial 8" and 6" diameter riser piping before the calculation assumes any water enters the dry part of the piping system.
3.10 The spray piping filling time will be calculated for,the "A" spray train (header number 1) since the total length of all 3 ring headers for this train is about 19 feet longer than that for the "B" train.
i i
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2 4.0 DESIGN INPUT 4
4.1 The analysis setpoint for containment high pressure is 5 psig [Ref. 6.2]. This value l
is consistent with the actual containment high pressure setpoint of 3.4 psig established in Reference 6.2 and incorporated into the Station Technical Specifications (Ref. 6.15, Unit 2 as an example). The high pressure setpoint 1
initiates the safety injection actuation signal (SIAS) and containment cooling i
actuation signal (CCAS). The SIAS signal initiates startup of the high and low j
pressure safety injection pumps and the containment spray pumps (P-012 and P-013) through the ESF sequencer. The CCAS signal will start the emergency t
cooling units (E-399, E-400, E-401 and E-402) and cause the component cooling water block valves to the emergency cooling units to open (2(3)HV-6366 through 2(3)HV-6373).
4.2 The analysis setpoint for containment high-high pressure is 20 psig (Ref 6.2]. This value is consistent with the actual containment high-high pressure setpoint of 14.0 psig established in Reference 6.2 and incorporated into the Station Technical Specifications [Ref. 6.15, Unit 2 as an example). The high-high pressure setpoint initiates the containment spray actuation signal (CSAS) which causes the containment spray block valves,2(3)HV-9367 and 2(3)HV-9368, to open.
4.3 The diesel generator delay for the LOOP case is 10 seconds [Section 4.8.5.D of Ref. 6.5]. This time interval includes generator start, attainment of rated voltage and frequency, and breaker closure energizing the 4160 volt ESF bus. This value is the same as the surveillance test acceptance value of 10 seconds cited in Section 7.1.16.2.2 of Reference 6.17.
4.4 Ine nominal delays for sequencing the first 4 ESF load groups are [Ref. 6.6]:
Group 1 0 seconds Group 2 5 seconds Group 3 10 seconds Group 4 15 seconds The emergency fan cooler motors are in Group 1 [Ref. 6.6].
The containment spray pump motors are in Group 3 [Ref. 6.6].
The component cooling water pump motors are in Group 4 [Ref. 6.6].
As identified in Assumption 3.4, supported by Reference 6.25, the repeat accuracy of the load group delay times is 10% of the Agastat time delay relay setting.
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4.5 The maximum stroke time for opening the containment spray block valves, 2(3)HV-9367 and 2(3)HV-9368, is 12 seconds (Refs. 6.10 and 6.11).
4.6 The maximum stroke time for opening CCW isolation valves 2(3)HV-6366 through 2(3)HV-6373, which permit cooling water to flow through the containment emergency cooling units, is 12 seconds [Refs. 6.10 and 6.11).
4.7 The maximum time required to accelerate a containment spray pump to full speed, following closure of the pump power supply breaker is 4 seconds. This value is slightly more conservative than the maximum acceptable surveillance test value of 3.9 seconds identified in Reference 6.12.
4.8 The maximum time required to accelerate a CCW pump to full speed following closure of the pump power supply breaker is 4.5 seconds [Ref. 6.3). This value is conservative with respect to a vendor-supplied acceleration time of 2 seconds I
at 75% voltage shown in Reference 6.13.
4.9 The maximum time required to accelerate an emergency cooling unit fan motor to full speed following closure of the fan motor power supply breaker is 10 seconds
[Ref. 6.3).
This value is conservative with respect to a vendor-supplied acceleration time of 7.8 seconds at 80% voltage shown in Reference 6.14.
4.10 The spray pump flow rate delivered to the containment riser while filling of the spray ring headers is in progress (prior to establishment of full containment spray flow at design nozzle pressure drop) will be taken to be 1650 gpm with the spray isolation valve 2(3)HV-9367 or 2(3)HV-9368 one-half open and 1900 gpm with the spray block valves full open. These values have been conservatively selected to be less than the minimum flow rates calculated for cases 5 and 7, respectively, of I
Reference 6.1 for a 7.5% degra'ded spray pump drawing water from a full RWST and pumping into a 60 psig containment building during the time that the spray piping is filling, before the full nozzle pressure drop is developed.
4.11 The Sprayco 1713A hollow cone bottom ramp spray nozzles have a design flow rate of 15.2 gpm at a 40 psid nozzle pressure drop [ Appendix 2 of Ref. 6.1). With turbulent flow conditions, the flow rate will vary ac the square root of the nozzle pressure drop.
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i 5.0 METHODOLOGY The start times for the containment sprays and emergency cooling units are j
determined by combining in series (and in parallel, if appropriate) the time intervals for each action which must occur to establish a functioning heat removal system.
The constituents of the total delay times are identified below.
A. Emeraency Coolina Unit Operation 1)
Time to reach containment high pressure analysis setpoint following the design basis LOCA or MSLB i
2)
Sensor and instrumentatiori delays to generate the containment cooling actuation signal (CCAS)
)
j 3)
Assuming LOOP, time to start the diesel generator, reach design voltage and frequency, and energize the 4160 volt ESF bus (with no LOOP, the diesel generator delay is not applicable) 4)
Time to open the component cooling water (CCW) block valves to the emergency cooling units 1'
5)
Time for the emergency cooling unit fan motors, which are in the 1st ESF t
load group, to be energized and accelerate to full speed i
l 6)
Also, assuming LOOP, ESF sequencing delay in restarting the CCW pumps which start in the 4th load group (with no LOOP, CCW pumps remain running and this delay does not apply) l 7)
Time to accelerate the CCW pumps to full speed, restoring CCW flow, assuming a LOOP had occurred (not applicable for a no LOOP case) i
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B. Containment Sorav System Operation 1)
Time to reach containment high pressure analysis setpoint following the design basis LOCA or MSLB 2)
Sensor and instrumentation delays to generate the safety injection actuation signal (SIAS) which initiates automatic sequencing of ESF equipment and starts the containment spray pump in the 3rd load group (with LOOP, sequencing is delayed until the ESF bus is energized by the emergency diesel generator) 3)
Assuming LOOP, time to start the diesel generator, reach design voltage and frequency, and energize the 4160 ESF bus (with no LOOP, the diesel generator delay is not applicable) 4)
Time for the spray pump motors to be energized and accelerate to full speed 5)
Time to reach containment high-high-pressure analysis setpoint following design basis LOCA or MSLB 6)
Sensor and instrumentation delays to generate ti.a containment spray actuation signal (CSAS) which initiates opening of the containment spray isolation valves and allow spray water to begin filling the spray piping in containment 7)
Time to open the containment spray isolatio.n valves 8)
Time to fill the spray rings and establish full containment spray flow
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6.0 REFERENCES
6.1 Mechanical Calculation M-0014-009. Rev. O, " Containment Spray Pumps inservice Testing Minimum Requirements", March 3,1993 6.2 ABB-CE Calculation CE-NPSD-570-P, Rev. 03-P," Plant Protection System Setpoint Calculation", October,1991, SCE Document No. SO23-944-C50-0 6.3 General Engineering Procedure SO23-XV-6, Rev. O, thru TCN 0-2, " Technical Specification Response Time Surveillance implementing Procedure Master List",
April 27,1989 6.4 Gould-Brown Bovari Switchgear Division Bulletin 8.2-1E, "ITE Type HK Stored Energy Metal-Clad Switchgear", Table 9, page 43 (copy of page 43 provided in Appendix A) 6.5 Specification SO23-403-12, Rev. 2, " Diesel Driven Electrical Generating Sets for SONGS Units 2 and 3", October 3,1975 6.6 Electrical Calculation E4C-016, Rev. 5 "ESF Sequencing", May 4,1984 6.7 NCRs 93030001,2,3, and 4; Containment Spray Pumps 1 & 2 for SONGS Units 2&3 6.8 Nuclear Calculation N-4080-027, Rev. O, " Containment P/T Analysis for Design Basis MSLB" 6.9 Nuclear Calculation N-4080-026, Rev. O, " Containment P/T Analysis for Design Basis LOCA" 6.10 Engineering Procedure, SO23-V-3.5, TCN 7-32, " Inservice Testing of Valves Program", December 9,1993 6.11 Surveillance Operating Instruction, SO23-3-3.30, TCN 7-26, "in-service Valve Teotng, Quarterly", September 10,1993 6.12 Engineering Procedure SO23-V-3.4.6, TCN 10-12, " Containment Spray inservice Pump Test", November 6,1993
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a 6.13 Vendor Drawing, SO23-405-9-70-1, " Motor Acceleration Time Curves" 6.14 Vendor Document, SO23-410-1-158-3, " Electric Motor Data, 460-Volt Motors and Below" 6.15 SONGS Unit 2 Technical Specifications, Through Amendment 108 6.16 Operator Surveillance Test, S023-3-3.11.2, TCN 0-3, " Containment Spray System Refueling Test", September 20,1993 6.17 Surveillance Operating Instruction, S023-3-3.12, TCN 11-1," Integrated ESF System Refueling Test", November 23,1993 6.18 Spray Piping Plan Drawings (Unit 2) a.
40494-6 c.
40397-8 b.
40421-16 (sheet 1) d.
40383-10 6.19 Spray Piping Isometric Drawings (Unit 2)
A-Train (Header No.1)
B-Train (Header No. 2) a.
S2-1206-ML-047, Sh.1, Rev. 9 h.
S2-1206-ML-041, Sh.1, Rev. 9 b.
S2-1206-ML-047, Sh. 2, Rev. 8 i.
S2-1206-ML-041, Sh. 2, Rev. 9 c.
S2-1206-ML-048, Sh.1, Rev. 4 J.
S2-1206-ML-042, Sh.1, Rev. 5 d.
S2-1206-ML-049, Sh.1, Rev. 3 k.
S2-1206-ML-043, Sh.1, Rev. 5 e.
S2-1206-ML-050, Sh.1, Rev. 4 1.
S2-1206-ML-044, Sh.1, Rev. 5 f.
S2-1206-ML-051, Sh.1, Rev. 3
- m. S2-1206-ML-045, Sh.1, Rev. 4 g.
S2-1206-ML-052, Sh.1, Rev. 4 n.
S2-1206-ML-046, Sh.1, Rev. 6 6.20 Piping and Instrumentation Drawing 401148-12 6.21 Piping Material Classifications, Drawing 90004-55 6.22 Crane, Technical Paper 410,,-low of Fluids",1976 6.23 Nuclear Calculation N-4080-004, Rev.1," Equipment Qualification Thermal Analysis (MSLB)", November 6,1978
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1 6.24 Mechanical Calculation M-0014-003, Rev. O, " Containment Spray Flow History",
May 28,1975 6.25 Amerace Corporation, Industrial Electrical Products Division, Bulletin E70-1, "Agastat Nuclear Qualified Time Delay Relays", E7000 Series Operating Characteristics from Specifications on Page 4 (copy of the table provided in Appendix B)
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1 7.0 NOMENCLATURE 7.1 Mathematical Symbols i
A pipe flow area (ft )
L pipe length (feet)
O volumetric flow rate (gal / min) qn individual spray nozzle flow rate (gal / min-nozzle) l t
time (seconds) l l
V piping volume (ft )
i 7.2 Abbreviations & Acronyms i
l CCAS Containment Cooling Actuation Signal j
l CCW Component Cooling Water COPATTA Containment Pressure and Temperature Transient Analysis computer i
program i
CS Containment Spray CSAS Containment Spray Actuation Signal CSP Containment Spray Pump DB Design Basis DBA Design Basis Accident ECU Emergency Cooling Unit (in containment)
EDG Emergency Diesel Generator
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a ESF Engineered Safety Feature ESFAS Engineered Safety Feature Actuation System gpm gallons per minute (flow rate)
LOCA Loss Of Coolant Accident LOOP Loss of Offsite Power LOVS Loss Of Voltage Signal MSLB Main Steam Line Break NCR Non-Conformance Report psid pounds per square inch differential RWST Refueling Water Storage Tank SIAS Safety injection Actuation Signal UFSAR Updated Final Safety Analysis Report
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8.0 CALCULATIONS 8.1 Emeraency Coolina Units The timing of the automatic startup of the emergency cooling units following a design basis LOCA or MSLB, with and without loss of offsite power, is developed in the following two sub-sections. The total delay time is developed using a chronology of events approach. Timelines describing the sequence of events for emergency cooling unit startup, with and without loss of offsite power, are provided in Figure 1. The delay times associated with each component of the overall delay time, which are provided in the chronologies below, have been included on the timelines in parentheses.
8.1.1 ECU Actuation With No Loss of Offsite Power (see Figure 1.A)
(A)
DB LOCA or MSLB occurs zero seconds (B)
Containment pressure reaches the analysis 2 seconds (Assump. 3.5) setpoint for containment high pressure (5 psig, Des. Input 4.1)
(C)
SIAS generated 1 second after reaching Sequencing of ESF equipment begins hi pressure setpoint (CCW pumps already running)
(Assump. 3.1)
CCAS generated CCW block valves to ECUS begin to open Emergency cooling unit fan motors start (ECUS are in the first ESF load group per Design input 4.4)
(D)
Emergency cooling unit motor and fan at 10 seconds after ESF start rated speed signal (Des. Input 4.9 and Assump. 3.2)
(E)
CCW isolation valves to ECUS are fully 12 seconds from time open valves begin to open (Des. Input 4.6)
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__ Sheet No.
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Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to reach full speed
=A+B+C+D
= 0 + 2 + 1 + 10 = 13 seconds i
Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to be j
at full speed with CCW block valves full open
=A+B+C+E I
= 0 + 2 + 1 + 12 = 15 seconds i
j The limiting action for establishing emergency cooling unit full operability with no l
loss of offsite power, following a design basis LOCA or MSLB, is opening the CCW 2
valves which provide cooling water flow through the ECUS. Although the CCW block valves will be about 83% open at the time the emergency cooling unit fans j
reach full speed, and should be capable of passing essentially full cooling water flow, full EF cooler operability will conservatively assumed to be available only after 3
the block valves are full open at 15 seconds post accident.
8.1.2 ECU Actuation With Loss of Offsite Power (see Figure 1.B) l (A)
DB LOCA or MSLB occurs zero seconds (B)
Containment pressure reaches the analysis 2 seconds (Assump. 3.5) setpoint for containment high i
pressure (5 psig, Des. Input 4.1)
(C)
SIAS generated 1 second after reaching CCAS generated hi pressure setpoint LOVS is present and EDG starts due to LOOP (Assump. 3.1) 3 4
(D)
EDG @ full speed and frequency and 10 seconds after EDG i
ESF bus energized start (Des. Input 4.3)
Sequencing of ESF equipment begins i
CCW block valves to ECUS begin to open ECU fan cooler motors start (ECUS are in first ESF load group per Design input 4.4)
)
(E)
ECU motor and fan at rated speed 10 seconds after ESF start signal (Des. Input 4.9 and Assump 3.2) d
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A a
l l
(F)
CCW isolation valves to ECUS are fully open 12 seconds from time valves begin to open (Des. Input 4.6) 4 1
(G)
CCW pump motor starts (CCW pump 16.5 seconds after start motors are in the fourth ESF load of ESF sequencing group per Des. Input 4.4)
(Assumps. 3.2 and 3.4)
\\
(H)
CCW pump at full speed 4.5 seconds after ESF start signal (Des. Input 4.8)
Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to reach full speed
=A+B+C+D+E
= 0 + 2 + 1 + 10 + 10 = 23 seconds Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to be at full speed with CCW block valves full open
=A+B+C+D+F
= 0 + 2 + 1 + 10 + 12 = 25 seconds Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to be j
a full speed, CCW block valves fully open and restarted CCW pump
=A+B+C+D+G+H
]
= 0 + 2 + 1 + 10 + 16.5 + 4.5 = 34 seconds The limiting action for establishing emergency cooling unit full operability with loss of offsite power and the loss of voltage signal simultaneous with the safety injection actuation signal (SIAS/LOVS event), following a design basis LOCA or MSLB, is l
restarting the CCW pumps through the ESF sequencing time delay relays. The total delay time for emergency cooling unit operability in this case is 34 seconds.
4
to T
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ECU ACTUATION WITH NO LOSS OF OFFSITE POWER g g g
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0)
Z 08 LOCA (10)
Dg mergency Cooling Unit 3
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motor & fan at Q
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rated speed a 13 sec C
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3 3
2
-4 Contairunent SIAS generated; CCW block valves to ECUS e
m 3
e 5
pres reaches ESF seg begins; are futty open; 8
h-hi analysis CCW ptmps running; design CCW flow to S
Zq setpt a 2 see CCAS generated; Ecus established; o
o g
CCW btk vives to ECUS ECUS futty operational a 15 sec 0-Q m
begin to open; O
Q a
3 o
ECU fan motors start a 3 sec 8
D C
z g
g o
m 3
i B.
ECU ACTUATION WITH LOSS OF OFFSITE POWER f
3 3
/
/
E j
CCW blk vtves to
.~
o j
F/ECUsfullyopen D
o h
O 1
m.
O To or MSLB 1 2 25 see S
f 2
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occurs f
(10)
Ep a time 0 T
I ECU motor & fan at
.+
gz gg 8
I I rated speed a 23 sec O
o A (2)
II(1)C_
+ +
4 un z
i 3
=
o (10)
D (16.5)
G (4.5) H l
Containment SIAS generated; EDG G full spd & freq; CCW puup CCW ptmp a futt speed; N
$Q pres reaches CCAS generated; ESF bus energized; motors design CCW flow to j
fg hi analysis Lovs present ESF seq begins; start ECUS established; WB Om setpt a 2 sec & EDG starts CCW btk vives to ECUS a 29.5 see ECUS futty operational Z
h j a 3 see begin to open; a 34 sec 3
g y
ECU fan motors start Q
e a 13 sec l
Z 3
N40803F1.WQ1 o
I W
$m < m:D
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25 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
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Paul Barbour 12/23/93 Allen Evinay 12/23/93 /\\
h 5
/\\
/\\
s 8.2 Containment Sorav System The timing of the automatic startup of the containment spray system following a design basis LOCA or MSLB, with and without loss of offsite power, is developed in a manner similar to that used for the emergency air coolers. The time to fill the empty spray piping and ring headers inside containment is calculated separately in sub-section 8.2.3. Timelines describing the sequence of events for containment spray startup, with and without loss of power, are provided in Figure 2. The delay times associated with each component of the overall delay time, which are provided in the chronologies below, have been included on the timelines in parentheses, i
8.2.1 CS Actuation With No Loss of Offsite Power (see Figure 2.A)
(A)
DB LOCA or MSLB occurs zero seconds j
I (B)
Containment pressure reaches the analysis 2 seconds (Assump. 3.5) i setpoint for containment high pressure (5 psig, Des. Input 4.1)
(C)
SIAS generated 1 second after reaching 4
Sequencing of ESF equipment initiated hl pressure setpoint (Assump. 3.1)
(D)
Containment pressure reaches the analysis 9 seconds (Assump. 3.6) setpoint for containment high-high pressure (20 psig, Des input 4.2)
(E)
CSAS generated 1 second after reaching Containment spray block valves begin hi-hi pressure setpoint to open (Assump. 3.1)
(F)
Containment spray pump motor starts 11 seconds after start of (Spray pump motors are in the third ESF sequencing ESF load group per Des. Input 4.4)
(Assumps. 3.2 and 3.4)
(G)
Containment spray pump at full speed 4 seconds after ESF start Spray block valves are about 67% open signal (Des. Input 4.7)
(8 seconds of the 12 second valve stroke time have elapsed)
1 NES&L DEPARTMENT CALCULATION SHEET
"" $cN so.
eReu eme Or Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN No. CCN -
Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
26 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE 1RE DATE R
/\\
Paul Barbour 12/23/93 Allen Evinay 12/23/93 /\\
A A
a (H)
Containment spray' block valves full open 12 seconds after CSAS generated (Des. Input 4.5)
(1)
Spray piping and ring headers filled and 31.1 seconds after CSP at full containment spray flow established full speed (see 8.2.3) from the spray system Elapsed time following DB LOCA or MSLB for containment spray pumps to reach full speed
=A+B+C+F+G
= 0 + 2 + 1 + 11 + 4 = 18 seconds Elapsed time following DB LOCA or MSLB for containment spray block valves to be full open
=D+E+H
= 9 + 1 + 12 = 22 seconds Elapsed time following DB LOCA or MSLB for containment spray system to be fully functional assuming full header filling flow rate credited at time CSP reaches full speed (Assump 3.9)
=A+B+C+F+G+1
= 0 + 2 + 1 + 11 + 4 + 31.1 = 49.1 seconds
= 49 seconds rounded 8.2.2 CS Actuation With Loss of Offsite Power (see Figure 2.B)
(A)
DB LOCA or MSLB occurs zero seconds (B)
Containment pressure reaches the analysis 2 seconds (Assump. 3.5) setpoint for containment high pressure (5 psig, Des. Input 4.1)
(C)
SIAS generated 1 second after reaching LOVS is present and EDG starts due to LOOP hi pressure setpoint (Assump. 3.1)
(D)
Containment pressure reaches the analysis 9 seconds (Assump. 3.6) setpoint for containment high-high pressure (20 psig, Des. Input 4.2)
NES&L DEPARTMENT C#!.CULATION SHEET eReu ccN NO.
PAGE OF Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
ccN NO. CCN -
Subject Containment SDrav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
27 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
/\\
Paul Barbour 12/23/93 Allen Evinay 12/23/93 [\\
h 5
A A
4 i
(E)
CSAS generated 1 second after reaching i
hi-hi pressure setpoint (Assump. 3.1)
(F)
EDG at full speed and frequency and 10 seconds after EDG ESF bus energized start (Des. Input 4.3)
Sequencing of ESF equipment begins Containment spray block valves begin to open with CSAS already present (G)
Containment spray pump motor starts 11 seconds after start of i
(Spray pump motors are in the third ESF sequencing ESF load group per Des. Input 4.4)
(Assumps. 3.2 and 3.4)
(H)
Containment spray block valves full open 12 seconds after ESF bus is loaded with CSAS l
present (Des. Input 4.5)
(1)
Containment spray pump at full speed 4 seconds after ESF start signal (Des. Input 4.7) l (J)
Spray piping and ring headers filled and 31.1 seconds after CSP at i
full containment spray flow established full speed (see 8.2.3) from the spray train Elapsed time following DB LOCA or MSLB for containment spray block valves to be full open
=A+B+C+F+H
= 0 + 2 + 1 + 10 + 12 = 25 seconds Elapsed time following DB LOCA or MSLB for containment spray pump to be at t
full speed
= A + B- + C + F + G + 1
= 0 + 2 + 1 + 10 + 11 + 4 = 28 seconds Elapsed time following DB LOCA or MSLB for containment spray system to be fully functional assuming full header filling flow rate credited at time CSP reaches full
]
speed (with all vaives wide open at that time)
=A+B+C+F+G+1+J 1
= 0 + 2 + 1 + 10 + 11 + 4 + 31.1 = 59.1 seconds
= 59 seconds, rounded 4
. _ _ ~ - - -
.. ~ -..
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2 N N 3
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9 EI to A.
CS ACTUATION WITH NO LOSS OF OFFSITE POWER N
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E o A
(9)
D (1) E (12)
H CS valves k
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^
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i futt open
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a 22 see z
]
O go or MSLB pressure a generated; I
O y
O F
s occurs hi-hi anal CS btk vives 8
C U
bb O
a time O setpoint begin to open l
9' a 9 sec a 10 sec y
Q>
p g
3 e
s h
A (2) 8 (1) C (11)
(4) G (31.1)
J g
h a
o s.
s (j) m Contairment SIAS gen; CS puup CS plap a full speed; Full containment 3
g 2
Z pres reaches ESF seg motor CS btk vives a 67% open; spray established 0_8 M
O hi analysis begins starts spray piping begins a 49.1 sec 3
O O
N setpt a 2 sec a 3 see a14 see to fitt a 18 sec (49 sec, rounded) 3 5
EL M U
E d
u
-4 C
Z M
g d
9
'O B.
CS ACTUATION WITH LOSS OF OFFSITE POWEa n
I g
(TI g
^
h A
N N 2
A (9)
T
-0 (1) E y CSAS
)
1 generated 3
g 8
8 j
g h yg 310 sec DB LOCA Cont'n't g
(12)
H CS valves T.
6 y
@o p
or MSLB pres a g
I full open h
j
{f I
3 occurs hi-hi anal i I
a 25 sec a time O setpoint 8
I q
y go i
2 o
l 8 9 sec 8
3 U2 Z
i T
- k -
0 k
O p
A (2) 8 (1) C (10)
F (11)
G (4) 1 (31.1)
J h
Containment SIAS gen; EDG a full speed CS pulp CS pump a Full contairment O
pres reaches LOVS present
& frequency; aiotor full speed; spray established zy hi analysis
& EDG starts ESF bus energized; starts spray pipng a 59.1 sec g
m
- O
.a setpt a 2 see a 3 see ESF seg begins; a 24sec begins to fitt (59 sec, rounded) m
,T CS btk vives begin a 28 sec m
to open a 13 sec z
N40803F2.Wo1 9
Q g
I a
pm <ma
NES&L DEPARTMENT CALCULATION SHEET ge" "o ccy no.
og Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN NO. CCN -
Subject Containment Sprav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
29
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REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DtTE IRE DATE R
/g Paul Barbour 12/23/93 Allen Evinay 12/23/93 /\\
y
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s 8.2.3 Spray Piping / Header Filling i
Filling of the spray riser piping and ring headers in containment is modeled as occurring in 8 discrete steps. The separate times calculated for each step are individually combined in series although a number of the steps will actually occur in parallel. The resultant fill time is, therefore, conservative. With reference to Figure 3 on page 30, the 8 steps are:
l 1)
Filling the 8" riser from 10 feet below the first ring header up to the elevation of the first ring header (length AB) 4 2)
Filling the horizontal 6" riser at the elevation of the first ring header (length BC) 3)
Filling the first ring header (4" piping), from points B and C to the capped ends of the ring header 4)
Filling the 6" riser from the first to the second ring headers (length CD) 5)
Filling the horizontal 6" riser at the elevation of the second ring header (length DE) 6)
Filling the second ring header (4" piping) from points D and E to the capped ends of the ring header 7)
Filling the 4" riser between the second and third ring headers (length EF) 8)
Filling the third ring header (21/2" piping) from point F to the capped ends of the ring header The A-train spray piping will be used as a basis for the fill time calculation per Assumption 3.9. The A-train piping to be filled consists of the following specific lines:
10 feet of 047-8"-C-KEO 049-4"-C-KEO 047-6"-C-KEO 050-4"-C-KEO 047-4"-C-KEO 051 4"-C-KEO 048-4"-C-KEO 052-21/2"-C-KEO
NES&L DEPARTMENT i
CALCU.LATION SHEET
" " $CN NO.
eREu PAGE OF Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION-1 CCN NO. CCN -
Subject Containment Sorav (CS) & Emeroency Coolina Unit (ECU) Actuation Times Sheet No.
30 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
/sg Paul Barbour 12/23/93 Allen Evinay 12/23/93
/\\
i
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a l
i i
o.rg. 2 6.'#-C-KEO l
A'"
3 2o AbstidS 3 os 180 '- ll g p-EL.
- A~ ~ 2 Y "~ C ~ KEO i
0 47 s4"-C-KGo 2
o S/- Y *- c - Kc o i
40 Aloittu E
D s9,ncy "2 Os~o. 9 c.elfo EL. / 7/'- 7 ks
O C. (,"-C - KlE D l
i oyp-V"-C -Kro l
}
56 No44tc i
B ca l
098-4 L c-xco anc, *'t Et, / YJ'- 3 d "
04 7-8" c-KED A
'0ll$.g*E.ki33 ' 3, ^ (a r rwn to'of f~t/tST' RIMG M6 Ab6A.
1 i
4 i
FIGURE 3 Containment Sorav Header Schematic - Train A 4
NES&L DEPARTMENT CALCULATION SHEET
- Reu"" $CN No.
,, Ace or Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN No. CCN -
Subject Containment Sorav (CS) & Emeroency Coolina Unit (ECU) Actuation Times Sheet No.
31 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE lRE DATE R
M Paul Barbour 12/23/93 Allen Evinay 12/23/93 [\\
A A
a I
The spray piping is all class KEO per P&lD 40114B [Ref. 6.20). The schedule [Ref.
4 6.21), inside diameter an'd cross-sectional flow area [Ref. 6.22) of each of the 4 pipe sizes being filled are tabulated below.
)
8" Schedule 20 8.125" ID 0.3601 ft area 6"
Schedule 10S 6.357" ID 0.2204 ft area
~
2 4"
Schedule 10S 4.260" ID 0.09899 ft area 21/2" Schedule 40S 2.469" ID 0.03325 ft area i
The time to fill each of the 8 piping sections identified on the previous page, and l
shown in Figure 3, is calculated as follows:
i 1)
The 10-foot length of empty riser below the 1st spray ring header (length AB):
l Length, L = 10 feet (Assumption 3.7) 3 Volume, V = L, x A = 10 x 0.3601 x 7.48 gal /ft = 26.9 gallons 3
i l
Filling flow rate, O, = 1900 gpm [ Des. Input 4.10)~
l j
Fill time, t, = V /O = (26.9/1900) x 60 sec/ min = 0.85 seconds i
i 2)
The 6" horizontal pipe connecting the lower 8" riser to the 6" riser between the 1st and 2nd ring headers (length BC):
Length, L = 17 feet (Ref. 6.19.a]
2 Volume, V = L x A = 17 x 0.2204 x 7.48 gal /ft = 28.0 gallons 2
2 2
Filling flow rate, O = 1900 gpm [ Des. Input 4.10]
2 Fill time, t = V /0 = (28.0/1900) x 60 sec/ min = 0.88 sec 2
2 2 3)
The first ring header,4" lines 048 and 049, points B and C to the capped ends of the ring header:
Ring header radius = 66' - 6" [Ref. 6.19.a]
Circumference (maximum for a complete circle) = 2 x x x 66.5 = 418 feet Ring header length, L (less length BC) = 418 - 11 = 401 feet a
NES&L DEPARTMENT CALCULATION SHEET
' !e"u"fCCN No.
eAos or Project oc DCP/MMP N/A Calc. No. N-4080M CCN CONVERSION:
j CCN No. CCN -
Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No. 32 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
5/\\
Paul Barbour 12/23/93 Allen Evinay 12/23/93 /\\
A
/\\
s I
i Volume, V = L x A = 401 x 0.09899 x 7.48 gal /ft = 296.9 gallons 3
3 3
While filling the 1st ring header, the filling flow rate (1900 gpmu) will be reduced by an assumed leakage flow from each of the 56 nozzles in the 1st header with the leakage flow rate based on a 5 psig head [ Assumption 3.8].
Based on Design input 4.11, the expected flow per nozzle with a 5 psig pressure drop is d
qn = 15.2 (5/40) 5 = 5.37 gpm per nozzle total nozzle leakage = 56 x 5.37 = 301 gpm i
Net filling flow rate, O = 1900 - 301 = 1599 gpm 3
Fill time, t = V /0 = (296.9/1599) x 60 sec/ min = 11.14 seconds 3
3 3 4)
The 6" riser from the 1st ring header to the 2nd ring header (length CD):
Length, L = 44 feet [Refs. 6.19.a and 6.19.b]
4 i
Volume, V = L x A = 44 x 0.2204 x 7.48 gal /ft = 72.5 gallons 4
4 4
I While filling the 6" riser, the static head on the first ring header increases by the elevation gain from the 1st ring header to the 2nd ring header. The 4
elevation of the 1st ring is 143'-311/16" [Ref. 6.19.a] and the elevation of the 2nd ring is 171'-7 5/16" [Ref 6.19.b]. The elevation difference is j
28'-3 5/8", or 28.3 feet. At ambient temperature, the conversion factor for l"
feet of water to psi is 0.433. Thus, the elevation gain will increase the pressure on the 1st ring header by 28.3 x 0.433 = 12.3 psi. The effective pressure acting to drive leakage out through the nozzles in the first ring header while the 6" riser is being filled is conservatively taken to be the 5 psig applicable during the filling of the ring plus the 12.3 psig due to the elevation difference between the 1st and 2nd rings, or a total of 17.3 psig
[ Assumption 3.8].
l 1
NES&L DEPARTMENT CALCULATION SHEET
'oc"", ccu so.
,,o, Og gRet Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN NO CCN --
Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
33 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE 1RE DATE R
A Paul Barbour 12/23/93 Allen Evinay 12/23/93 [\\
/\\
/\\
Based on Design input 4.11, the expected flow per nozzle with a 17.3 psig pressure drop is qn = 15.2 (17.3/40)"5 = 10.0 gpm per nozzle total 1st ring nozzle leakage = 56 x 10.0 = 560 gpm Net filling flow rate, Q = 1900 - 560 = 1340 gpm 4
Fill time, t = VJO = (72.5/1340) x 60 sec/ min = 3.25 sec 4
4 5)
The 6" horizontal pipe connecting the riser feeding the 2nd ring header with the 4" riser that feeds the 3rd ring header (length DE):
Length, L = 15 feet [Ref. 6.19.b]
3 Volume, V = L x A = 15 x 0.2204 x 7.48 gal /ft = 24.7 gallons 3
3 3
Filling rate, O = 1340 gpm (same as 0 )
3 4
i Fill time, t = VgO = (24.7/1340) x 60 sec/ min = 1.11 sec 3
3 6)
The second ring header, 4" lines 050 and 051, points D and E to the capped ends of the ring header:
Ring header radius = 43'-0" [Ref. 6.19.e]
Circumference (maximum for a complete circle) = 2 x x x 43.0 = 270 feet Ring header length, L (less length DE) = 270 - 15 = 255 feet e
Volume, V, = L x Ao = 255 x 0.09899 x 7.48 gal /ft = 188.8 gallons e
While filling the 2nd ring header, the maximum filling flow rate (1900 gpm) will be reduced by leakage out of the 40 nozzles in the 2nd ring header at a pressure drop of 5 psig.plus leakage out of the nozzles in the 1st ring header at a pressure drop of 5 psig plus the static head of water between the two ring headers [ Assumption 3.8].
Net filling rate, O = 0 - (40 x 5.37) = 1340 - 215 = 1125 gpm s
3 Fill time, t, = VgO = (188.8/1125) x 60 sec/ min.= 10.07 sec
NES&L DEPARTMENT CALCULATION SHEET
"" $CN No.
eReu PAGE OF Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN No. CCN -
Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
34 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE 1RE DATE R
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Paul Barbour 12/23/93 Allen Evinay 12/23/93 [\\
h b
A A
1 7)
The 4" riser from the 2nd ring header to the 3rd ring header (length EF):
Length, L = 25 feet [Ref. 6.19.b]
7 Volume, V = L x A = 25 x 0.09899 x 7.48 gal /ft = 18.5 gallons 7
7 7
While filling the riser, the pressure on the 1st and 2nd ring header nozzles will be increased by the static head equivalent to the elevation difference between the 2nd and the 3rd ring headers. Per References 6.19.e and 6.19.g, the elevation of the 3rd ring header is 180'-113/16" and that of the 2nd ring header is 171'-7 5/16". The elevation difference is 9'-3 7/8", or 9.33 i
feet. At 0.433 psi /ft, the static head is worth 4.0 psi pressure. Thus, the nozzles in the first ring header will see 5 psig plus 12.3 psig plus 4.0 psig, or 21.3 psig and the nozzles in the 2nd ring header will see 5 psig plus 4 psig, or 9 psig.
Based on Design input 4.11, the expected flow per nozzle with a 21.3 psig pressure drop is 1
qn = 15.2 (21.3/40) " = 11.1 gpm per nozzle 1st ring header leakage = 56 x 11.1 = 622 gpm and the flow per nozzle with a 9 psig pressure drop is qn = 15.2 (9/40) " = 7.21 gpm per nozzle 2nd ring header leakage = 40 x 7.21 = 288 gpm Net filling flow rate, 0 = 1900 - 622 - 288 = 990 gpm 7
l l
~
Fill time, t = V /0 = (18.5/990) x 60 sec/ min = 1.12 sec 7
7 7 J
i i
n
NES&L DEPARTMENT CALCULATION SHEET
!'!Eu nCN No.
esoe og Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN No. CCN -
Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
35 REV ORIGINATOR DATE 1RE DATE REV ORIGINATOR DATE 1RE DATE R
6/\\
Paul Barbour 12/23/93 Allen Evinay 12/23/93 [\\
A A
4 8)
The third ring header,21/2"line 052, from point F in two half-circles to the capped ends of the ring header:
Ring header radius = 25'-6" [Ref. 6.19.g]
Ring header length L, = circumference = 2 x x x 25.5 = 160 feet Volume, V, = L x A, = 160 x 0.03325 x 7.48 gal /ft = 39.8 gallons 8
While filling the 3rd ring header, the net flow rate will be the value used to fill the riser EF less leakage flow from the 20 nozzles in the top ring header leaking at a pressure drop of 5 psig, as used for the filling of the other two ring headers.
Net filling rate, 0 = 0 - (20 x 5.37) = 990 - 107 = 883 gpm 8
7 Fill time, t, = V /O = (39.8/883) x 60 sec/ min = 2.70 sec 3 s The total time to fill the spray piping from the time flow is assumed to begin is the sum of t through t. Thus, i
e t,p, nor,;ii = 0.85 + 0.88 + 11.14 + 3.25 + 1.11 + 10.07 + 1.12 + 2.70 t,ng,,ii, = 31.12 sec, or 31.1 seconds, rounded op
NES&L DEPARTMENT CALCULATION SHEET
'cc"
- PREL!M. CCN NO.
PAGE OF Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN NO. CCN --
a Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No. 36 4
REV ORIGINATOR DATE 1RE DATE REV ORIGINATOR DATE 1RE DATE R
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Paul Barbour 12/23/93 Allen Evinay 12/23/93
[\\
/\\
/\\
t APPENDIX A Table 7--Operating Voltage Rafige Table 8-Current Values-Voltage shown in Table 7.1 unee, Vensee Nominal SetW Clen Tate LMkat undu N.E.C.
Centree Cawging C,l*",,
Tj
.Pien up C",';'O' Con Cean Cess venage P.se e
wo,,
Voo,e oes.
a.im.m
' 24 V DC 14-30 21 F 14 22.0 09 30 a 48 V DC e 35-60 35 50 2s 60 41 15 29~
'20 0 10.7 to 7 0.15
- 0. 5 30 12S V OC 8013e -- 90430
_10-140 _
104 36 15 10.0 SO SO
-006 - -- 02 30 4
250 V OC 100 200 184 240 14& 280 212 FS-ISO 5.0 2.2 22 0.03
- 0. I 30 StSVAC 95 125 95-12S 8 95-12S 94 35-96 50 0 45 48 0.04 02 30 230 V AC 19 & 250 190 250 $ 19&250 194 89-140 50 23 23 0 20 01 30 NOTES:
- uniese ine circuit breanw is loc.ated close to one battery and protec-I Curreas niva are enesee eiesdy essee vais e-enen, inne n ove reia, and adeausie eiecinc conneenons are provided eetween time'eate se, sie snar,ing meters and AC seese see see,esimai.sy s.:
eur ene entiery and ino cos. 24 von DC tripoing is tioi recommended.
s ines wenues, en isnpe,ians seaside,esie ene sinin, one j 48VDC sonnq castging it not recommended.
benefy.
- AC erioping es not recommended (see page sob a de voit titopene er closing functions are not recommended. esceot onen ine device se secated near the aattery or enere specisi esto,1 is 4
made to ensure the adequacy of conductors between bettery and j
contros terminals.
y i
Table 9-HK Breaker Time Characteristics Table 10-Current Transformers MC 5, MC 15A1 Av. Spring interrupt 6ng Tiene Aetsyt Breeser Av. Cleeing Av. Tetoping Charging S 100% et Refing g,g.
Adeureep
.eteeing Accueseyt L
8MK 4 5 Cycies PO.1 Bo.2 So.5 81 82 FS&
18 Cycles 3 Seconde S Cycles T5/ 6 C10 12 l.2
=
=
F 5 Cycks 15 MW 100/8 C10 00 02 16 HK 1000 0 Cycles 2 0 Cycies 2 Seconde 5 Cycles i
t
]
Ctesing Teme-Between energimag closang cool and mating of arcing 200/8 CSO 0.3 0.3 0.3 1.2
- 2. 4 9 contacts.
400/S C50 0.3 0.3 0.3 0.0 12 Tripping Time-Between energising of trip coil and pariing of arc 6pg 600/5 C100 0.3 0.3 0.3 0.3 06 contacts.
800/S
.C100 0.3 03 0.3 03 0.3 laterrupting firne-8etween energialag trip coil and complete interruption.
1200/8 C200 0.3 0.3 0.3 03 03 1500/8 C200 0.3 0.3 0.3 0.3 03 2000/5 C200 0.3 0.3 0.3 03 03 T.= u-s, e weai.,.
, ou
, uui,,nenie
==g gg
- =
gj gj
- j Me.of Nestore Tessi wette 4000/5 C200 0.3 03 0.3 03 03 Type unal Per Frame Per Freme
, Fro,n,t mowneed..Ce.rrent,e.ra,nsformers are.evastao.w.oniy up to 2000/SA.
u T
2 300
,e i#., as ee e
.a,-t d. t ici e omee.
P s a ts HW 3
as0
- Space nesters on endoor equipment are an opponal aedition.
Table 12 stendeed singie Table 13 sianee,d Paese Centrel Potentist Poww Treneseemers Transleemere Venete Aeting "A
V*#e9e 2400/ 4140y-120 5
2400 - 240/120 2404 -120 416b240/120 4204 -120 10 4400 - 240/120 4806 -120 F200-240/120 7200 - 120 18 9400 - 240/120 840te-120 13200 - 240/120 12000-=120 25 13804 -240/120 14400 - 120 43
NES&L DEPARTMENT CALCULATION SHEET
'cc" * '
PREUM. CCN NO.
PAGE OF j
Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN No. CCN --
Subject Containment SDrav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
37 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
j
/$\\
Paul Barbour 12/23/93 Allen Evinay 12/23/93 /\\
E y
b b
g APPENDIX B OPERATING CHARACTERISTICS v
Environmental Conditions. (Qualified Ufe)
PARAMETIR MIN.
NORMAL MAX.
Temperature ('F) 40 70-104 156 Humidity (R.H. %)
10 40-60 95 Pressure Atmospheric Radiation (rads) 2.0 X 10'(Gamma)
Operating Conditions. (Normal Environment)
NORMAL OPERAUNG $PICINCATIONS WITH DC COILS WITH AC ColLS Coil Operating Voltage, Nominal (Rated)
As Spec As Spec Pull-in (% of rated value) 80% Min.
85% Min.
Drop out (% of rated value) 10% Approx.
50% Approx.
Power (Watts at rated value) 8 Approx.
8 Approx.
Relay Operate Tirne Model E7012 N/A N/A Model E7022 50 ms Max.
50 ms Max Relay Release (Recycle) Time ModelE7012 50 ms Max.
50 ms Max.
Model E7022 N/A N/A Contact Ratings, Continuous (Resiative at 125 vde) 1.0 amp 1.0 a np (Resistive at 120 vac,60 Hz) 10.0 amp 10.0 amp Insulation Resistance (in megohms at 500 vde) 500 Min.
500 Min.
Dielectric (vrms,60 Hz)
Between Terminals and Ground 1.500 1,500 Between Non connected Terminals 1,000 1,000 n
Repeat Accuracy 4 210%
e10%
Operating Conditions. (Abnormal Environment)
ADVER$E OPERATING NORMAL DIE "A" 08E "S" 088 "C" 08E "0" 8PECIPICADON8 Temperature (*F) 70 104 40 120 145 156 Humidity (R.H. %)
40-60 10 95 10 95 10-95 10 95 Coil Operating Voltage
- (% of Rated)
Model E7012 (AC)85-110 85-110 85 110 85 110 85 110 (DC) 80 110 80-110 80 110 90 110 90-110 Model E7022 (AC)85-110 85 110 85 110 85-110 85-110 (DC) 80 110 80-110 80-110 80 110 80 110
- All coils may be operated on intermdtent duty cycles at voltages 10% above 16sted maximums (Intermittent Duty = Maximum 50% duty cycle and 30 minutes "oN" time )
- s Repeat accuracy at any fixed temperature is 210% of setting.
INDUSTRIAL. ELECTRICAL PRODUCTS AMERACE CORPORATION INDUSTRIAL ELECTRICAL PRODUCTS 530 W. MT PLEASANT A/ENUE
'ses Amerace corporaton l7o.i LMNGSTON. NJ 07039-1790 novemoe, 5 seg (201) 992-8400 suonoces es2 TELEX 13 8403 FAX (201) 992 9416
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Nuclear Engineering Bec tel Job 10079
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Cont nment Accident Analysis Los Angeles Power Division Building 45 Copin to Ext.
R. Kawag hi D. Wilbur Utilize the fol wing delay times for your containment accident analysis calculat ons:
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LOS ANGELES. CALIFORNI A CONTROL VALVE 5 5PEC. NO.
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501 54 V
FORM NUM6ER (00 1
SOUTHERN CAllFORNIA EDIS0N COMPANY DATE CONTRACT i
5 R,0SEMEAD. CALIFORNIA N0 Bf DATE REVISIONill C/M N01 10/01/74 I
l 100776 TO
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P.O.
N 5AN N0FRE NUCLEAR GENERATING 51All04 SEE LINE 4C lAPPR St CNED I
TAG N0.
.'2 NY 6366
- 3 NV e348
- 2 NV 8367
- COOLING UNIT E401 C00 LING UNii E401 C00 LING UNil E401
- t00 LING #411 E40t N 1 LINE No./VE5 EL No.
281
- 2tl
- 283
- 203 E 4A CLA55lFICAT10NK 2lNS
. 2tNS 2146
. 21NS A 8 PAID N0.
- COORDINATES 40172 t.7 40172 B.7 40172 B.?
40172
- B1 A C P,0. NUMBER 501 58 507 58 507 50
- 501 58 L 0 APPLICABLE N0iES
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BODY SIZE : PORT SIZE 10 INCH FULL 10 INCH : FULL 10 INCH FULL
- 10 INCH : FULL 7
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- No. OF PORil. STEM
, SINGLE
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END CONN. 8 RATING x8Wl50 LB BWl50 Lt Bul50 LB
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BODY MATERIAL SA216 WCC CA$i $1 EEL SA216 WCC CA$f STEEL 5A216 WCC CAST STEEL SA216 WCC CAST STEEL
$ 10 PACKING MATERIAL J.C'1625GF J C 1625GF
- J.C 4625GF
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- YI5 i 8 limit SWitCN PER $PEC
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. PER $PEC
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. MOTOR REQUIREMENTS 460V/60HZ 3. PHASE
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. MOTOR REQUIREMENT 5
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- N/A N/A N/A N/A 0 31 FILT. REG.: GAGES :BY.PA$5:
Ji 5 32 INPUT SIGNAL I 33A QUTPUT SIGNAL f 8 34 FLOW UNIT 1. UNLESS OTHERWi$E SPECIFIED :L10Ul0 GPM :5fEAM Lt/NR : GAS SCFM 35 FLulo WATER WATER WATE WATER 36A QUANilif MAI.
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LosAngeleshCalifornia 90060 rsK t 5.E.
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P90L L L Attention: Vendor Print Control pygj, g, g
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,,g, g Gentlemen:
PROJ. E E.
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Subject:
San Onofr Nuclear Generation Station
~
PROI.C& 3DL L Units 2 & g ggg BechtelJob1Q079 PRD). R Main Steam Containment Isolation Valves Bechtel File S023-507-6 y, p *,
' j' ~&
,,_u Purchase Order J4'1g1821 p
6 Please find attached W-K-M CV in(ormation for the main steam containment i
isolation valves. This informati'on is not required per Bechtel Specifications, but is supplied in\\ eference to questions and Telexes from Bechtel to W-K-M.
Very ruly yours, rn y
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CONTROL NO. os9 31 CERTIFICATE OF AUTHENTICITY CONTINLATION This is to certify that the microphotographic images appearing in this microform are direct and facsimile reproductions of the original records of the Southern California Edison Company and were microfilmed in the regular course of business. The microfilming has been performed according to established routine Company Policy for systems utilization and/o. maintensnce and preservation of records through the storage of such microforms in protected locations.
THE DOCUMENTS CONTAINED ON THIS MICROFORM ARE ORIGINAL RECORDS OF:
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Southern California Edison For the NATERIAL a ADetINISTRATIVE SERVICES - CD06/8CMGS Depar nt 4
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This microform file is a complete record of the transaction herein recorded. The documents are arranged on this microform in the following manner:
O av moain ia 'ocaiioa aad work order i au ac. O Order of Payroll Location Number I
Q Alphabetical order by O Grievance File Number sequence i
@ Numerical order by Design Cal.50.
O oei ord r O ord r of casiomer service Siore aumeer O'ot*er 1
The hardcopy documents used to create this microform have been authorized for destruction after verification of correctness and acceptability of the microfilming.
It is further certified that on the date specified below, the micrographic images appearing on this microform were made at a reduction ratio of 29 :1 under my direction and control.
The above information is deemed necessary in compilance Licensees - issued March 14,1972. This order has subse.
with the Federal Power Commission Order No. 450 Resu.
quently been approved by the Putdic Utilities Commission lations to govem the Preservation of Public Utilities and of the State of california on October 29,1974.
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PAGE TOTAL NO. OF South;rn California Edison company kE$ccN NO.]
N-4080-003 INTERIM CALCULATION BASE CALC. REV.
UNIT CCN CONVERslON :
CALC. REV.
CHANGE NOTICE (ICCN)/
5 2&3 CCN NO. CCN-
/
5 CALCULATION CHANGE CALCULATION SUBJECT :
NOTICE (CCN)
CONTAINMENT SPRAY (CS) AND EMERGENCY COOLING COVER PAGE UNIT (ECU) ACTUATION TIMES ENGINEERING SYSTEM NUMBER / PRIMARY STATION SYSTEM DESIGNATOR Q class CALCULATION cross-INDEX j
O New/ Updated index included CONTROLLED PROGRAM OR PROGRAM / DATABASE NAME (s)
VERslON/ RELEASE NO.(s)
O Exis'ing index is complete DATABASE ACCORDING TO O ALsO, LISTED BELOW s0123 XXIV-5.1 IBRIEF DESCRIPTION OF ICCN / CCN: O PROGRAM O DATA BASE N/A N/A Rsvise sheets 2,4-16,18, and 21-28; Add sheets SA,21 A,27A, and 38 40; Delete sheets (NONE)
This change inccrporates:
- 1) Increased Agastat sequencing time datay relay repeatability from vendor specification of +/- 10% of the relay setting to
+/- 2.5 seconds for sequencing the containment spray (CS) pumps and the component cooling water (CCW) pumps.
- 4) A new evaluation of the startup of Emergency Cooling Units with no Loss of Offsite Powerwhich assumes a malfunction in the operating CCW train which requires an ESF sequenced startup of a non-running CCW pump with the sequencing commencing with SIAS. A credible event causing this scenario would be a LOVS on the operating CCW bus, but with with no LOOP.
Incorporation of the above changes results in no change in overall actuation time forthe CS with orwithout LOOP, and no change in overall actuation time for the ECU with LOOP. The overall actuation time for the ECU with no LOOP increases from 15 seconds to 24 seconds. The additional delay in actuating ECUS with no LOOP has no impact on analyses of record for Containment pressure-temperature response to design basis LOCA or MSLB events because the ECU start times actually used in the P-T AORs bound the value from this actuation timing analysis.
INITIATING DOCUMENT (DCP, FCN, OTHER)
N/A REV.
- 2. OTHER AFFECTED DOCUMENTS (CHECK AS APPLICABLE FOR CCN ONLY):
(see cHAmc To cAcc cAoss swg cAcc. sH.D)
( YEs O NO OTHER AFFECTED DOCUMENTS exist AND ARE IDENTIFIED ON ATTACHED FORM 26-s03.
t
- 3. APPROVAL :
DISCIPLINE / ESC : Nuclear Safety Anal.
PAUL BARBOU 9/x/> fy-9/2cjjf" ORIGINATOR (Pnnt name/ initial /date)(
.shnature/date) /
OTHER (signature /date)
ALLEN EVINAY/h / k20/95
/
9/3/jf-IRE (Pnnt name/ initial /date)
DM (sihnature/date) '
OTHER (signature /date)
- 4. ASSIGNED SUPPLEMENT ALPHA DE GNATOR :
CONVERslON TO CCN DATE Mb b
[dCE CDM - SONGS sCE 26-122-1 REV. o 8/94 [
REFERENCE:
s0123-XXIV-7.1s}
T UETFORWORMSWEDO.GEhn1221. 00 MDF Ver 00 00 03 6/9/95:-
CALCULATION CROSS INDEX
= N NO. u 4 -.z so CCN CONWEfBON Calculatiort No.
N4000-003 Sheet No.
2 CCN NO.
CCN-l Cale. rev.
INPUTS OUTPUTS Does the output Ident#y output number lhese interfacing calculations and/or Results and conclusions of the sulsect interface interface and docuenents prowle input to the subject calculation are used in these interfacing calc / document cale/docuenent responsible calculation, and if revised may require calculations and/or documents.
require revueon?
OCN,DCN supervisor revision of the suficct calculation.
1EN/Rev.or FIDCN initials and YES/NO Cale/ Document No.
Rev. No.
Calc / Document No.
Rev. No.
/
f Calculations:
UFSAR, SONGS Units 2&3, Section 6.2.2 10 /
q SAR23-270 l
)
f M-0014-009 0
Tables 6.2-30 & 6.2-31
})
N4000-002 1
N-4000-007 2
Calculation M-0014-003 0
Yes/ supersede AJB-93-141' l
E4C-016 5
SO23-944C50 0
Calculation N-4000-004 I
Yes 9030001/1 thru (CE-NPSD-570-P Rev. 03-P) 9030004/I "
5 Drawinas:
Calculation N Il40-020 0
No M/A 40383 10 40397 8
Calculation N-4000-026 0
No N/A 40421, sheet I 16 40494 6
Calculation N-4080-027 0
No N/A 40114B 12 90004 55 5
IsometrE Drawinas:
52-1206-ML-047, sheet I 9
- MN les im S21206-ML-047, sheet 2 8
S2-120644L-048, sheet 1 4
- N N W
/
S2-1206-ML-049, sheet i 3
( acq g;gfryeJ4 Imp /toOG Wh Ss9A C/rA*JCe S21206-ML-050, sheet 1 4
Wr Lt. 6F C# BATE D dY ACAlo /? tor 4 A
S2-1206 ML-051, shece 1 3
A/FN!/Af4 7b 4/C GALTt/Jef Tb AG f(Ac.7-O S21206-ML-052, sheet 1 4
8 C C-C// 4@GT#J71ffj 1404f"
~
5 Vendor Prints:
S023-405-9-70 1
5023-410-1-158 3
NES&L DEPARTMENT CALCULATION SHEET
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,Aa, 3 0,3 o gnc Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERslON:
y CCN No. CCN -
I Subject Containment Spray (CS) & Emeroency Coolina Unit (ECU) Actuation Times Sheet No.
4 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
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g TABLE OF CONTENTS SECTION PAGE 1.0 PURPOSE.....................................
5 2.0 RESULTS, CONCLUSIONS & RECOMMENDATIONS..
6 3.0 ASSUMPTIONS..................
...........9 4.0 D ESIG N IN PUT.....................
12 5.0 METHODOLOGY.............
14
6.0 REFERENCES
16 7.0 N O M E N C LATU R E.......................
19 8.0 CALCULATIONS 21 8.1 Emergency Cooling Units...
21 8.1.1 ECU Actuation With No Loss of Offsite Power......
21 8.1.2 ECU Actaation With Loss of Offsite Power 22 8.2 Containment Spray System..
25 8.2.1 CS Actuation With No Loss of Offsite Power 25 8.2.2 CS Actuation With Loss of Offsite Power..
26 8.2.3 Spray Piping / Header Filling.
29 APPENDICES Apperrix A 0 ild-Brown Bovari Switchgear Division.
36 Basiea 8.2-1E, *lTE Type HK Stored Energy Metal Clad Switchged. Table 9, Page 43 [ Reference 6.4)
Appendix B Amerace Corporatu.i, Industrial Electrical Products 37 D: vision, Bulletin E70-1, 'Agastat Nuclear Qualified Time Delay Relays", E7000 Series Operating Characteristics from Specifications on Page 4 [Ref. 6.25]
Appendix C Memorandum, D. Stickney to A. Brough, " Analysis for 38 Obtaining a 22.5 seconds of Relay Setting on Agastat
]
Timing Relay for Load Sequence Timing Tolerance in Tech Spec 4.8.1.1.2.d.13", July 21,1995 [Ref. 6.26]
NES&L DEPARTMENT CALCULATION SHEET lREu" " $CN No. u - /
eAceforlo Project Or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
j CCN No. CCN - I Subject Containment Sorav (CS) & Erneraency Coolina Unit (ECU) Actuation Times Sheet No.
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g 1.0 PURPOSE The purpose of this calculation is to determine a conservative time interval between the occurrence of the design basis loss of coolant accident (LOCA) or main steam line break (MSLB) in containment and the time at which a single train of the containment spray (CS) system or a post accident emergency cooling unit (ECU) is fully functional for containment heat removal. The containment spray and emergency cooling unit delay times are determined with and without a loss of off-site power (LOOP).
This revision of the calculation specifically includes engineered safety features (ESF) analysis set points of 5 psig for safety injection and containment emergency cooling unit actuation and 20 psig for containment spray system actuation. This revision also specifically calculates a spray piping fill time consistent with the performance of a 7.5% degraded containment spray pump identified in calculation M-0014-009 [Ref. 6.1].
This revision of the calculation also incorporates an increase in the Agastat sequencing time delay relay repeatability from the vendor specification of 10% of the relay setting to 2.5 seconds for sequencing the containment spray (CS) pumps and the component cooling water (CCW) pumps. The revision also includes shorter CS pump and CCW pump acceleration times of 1.9 and 2.5 seconds, respectively, as requested by Reference 6.26.
The esults of this calculation are included in UFSAR Chapter 6, tables 6.2-30 and 6.2-31, which present design basis delay times for containment heat removal system operation following a design basis LOCA or MSLB in containment. For conservatism, the delay times developed in this calculation are based on the containment pressure response to the design basis MSLB (main steam line break at 102% reactor power) since this accident provides a slower rate of containment pressure rise than does the design basis LOCA.
The delay times determined in this calculation provide a basis for modeling the start of containment heat removal systems in analyses to determine the containment pressure and temperature response to the design basis LOCA and MSLB events. These delay times are applicable only to large break events with containment pressure ramps that reach the containment high and high-high pressure analysis setpoints within the times used in this calculation.
In-containment high energy line break events which provide slower rates of containment pressurization should be individually evaluated for the timing of heat
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s removal system operation using the methodology of this calculation, but based on a calculated break-specific time to reach the high and high-high containment pressure analysis setpoints.
This calculation revision is required to support closure of disposition step 2 of NCRs 93030001,2,3, and 4 [Ref. 6.7] by providing minimum CS and ECU start time data for use in revising the design basis LOCA and MSLB analyses of record.
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NES&L DEPARTMENT CALCULATION SHEET lREun CCN NO.u -/
exGE sor So Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN No. CCN -.
Subject Containment SDrav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
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g 2.0 RESULTS, CONCLUSIONS, AND RECOMMENDATIONS 2.1 Results The results of this calculation show that, following a design basis loss of coolant accident (DB LOCA) or a design basis main steam line break (DB MSLB), the i
containment emergency cooling units and containment spray system will be fully functional after the time intervals identified below. Delay times reflecting loss of offsite power (LOOP) and no loss of offsite power (no LOOP) are provided. For the LOOP case, the loss of power is assumed to occur at a point in time following the LOCA or MSLB such that the loss of voltage signal (LOVS) which starts the emergency diesel generator, occurs coincident with the generation of the safety injection actuation signal (SlAS) occurring on containment high pressure (SIAS/LOVS event). The values in brackets {} are the values of record from the previous revisions of this calculation used to support the original licensing of g SONGS Units 2 and 3.
SUMMARY
OF RESULTS Emeraency Coolina Unit and Containment Sprav Actuation Times No Loss of Power With Loss of Power Emergency Cooling Unit Delay Time (seconds) 24 {13}
34 {33}
p Containment Spray Delay Time (seconds) 49 {46.6} ~
59 {55}
These delay times are specifically applicable to the DB LOCA (double-ended RCS suction leg slot break) or DB MSLB (steam line break at 102% power).
Containment high energy line break events which provide slower rates of containment pressurization than the DBA events cited should be individually evaluated for the timing of heat removal system operation using the methodology of this calculation, but based on break-specific times to reach the high and high-high containment pressure setpoints.
Timelines describing the sequence of events and individual delay times associated with each component of the overall actuation time are provided in Section 8 (Calculations) as Figures 1 and 2 on pages 24 and 28 for the emergency cooling units and the containment spray, respectively.
NES&L DEPARTMENT CALCULATION SHEET gREt"McNao.4/_f gAoE2 Orb Project or DCP/MMP N/A Calc. No. N-4083-003 l CC:I CoNVERStoN: j l CCN No. CCN - /
Subject Containment SDray (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
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g The change in analysis setpoint for containment high pressure from 4 psig to the currently used 5 psig [Ref. 6.2) had no effect on the delay time calculation. The 2 seconds previously allowed for the containment pressure to reach the high pressure setpoint envelopes the higher setpoint.
The 11-second increase in the delay time for emergency cooling unit operation with no LOOP reflects current station operating practice of normally operating only a single CCW pump train rather than always running both train pumps with only one train performing a cooling function. In this case, a loss of voltage signal (LOVS) on the operating CCW pump train without a loss of offsite power (LOOP),
or some other operating CCW train-related malfunction, will force a delay in the availability of the alternate CCW train. In this event, ESF sequencing which initiates b th on SIAS would start the available non-operating CCW train in the 4 load group, 15 2.5 seconds after initiating ESF sequencing. In addition, prior ECU startup j
analyses credited full functional capability at the time the CCW block valves were 10 seconds into their 12-second full open stroke time when the valves were 83%
open. However, now that ECU availability is delayed until the idle CCW train is operational (with or without LOOP), the the CCW block valves to the ECUS are fully open 9 seconds prior to the CCW pump reaching full speed.
The 1-second increase in the delay time for emergency cooling unit operation with LOOP results from the net effect of increasing the tolerance on the sequencing time delay relays for component cooling water pump start combined with a b reduction in the CCW pump acceleration time used in the current analysis.
The change in containment spray system flow rate to allow for up to 7.5% spray pump degradation (Ref. 6.1) increased the spray piping / header fill time by about 3.5 seconds which is the major contributor to the changes in spray start time.
Minor changes in other components of the overall delay time for the spray system actuation, including a 2.5 second uncertainty in the repeatability of sequencing the containment spray pump and a compensating reduction in the spray pump b motor acceleration time, also contributed small differences to the results.
NES&L DEPARTMENT CALCULATION SHEET eREuSCN NO.
$7 PAGE O OF O Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION. /-
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Subject Containment Sorav (CS) 8 Emeroency Coolina Unit (ECU) Actuation Times Sheet No.
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g 2.2 Conclusions & Recommendations The overall delay times employ constituent response times which are consistent or conservative with respect to Station response time and operability testing success criteria. Therefore, this calculation revision does not impact Station procedures.
The overall and constituent delay times from the prior revisions of this calculation l 6 are included in UFSAR table 6.2-30 and 6.2-31. Therefore, a UFSAR change request has been initiated to conform these tables to the current analysis of record.
The analyses of record for containment pressure and temperature response to the design basis LOCA and MSLB events used to support containment functional design and equipment qualification are N-4080-026 (Supplement A, LOCA) and g
N-4080-027 (Supplements A and B, MSLB) [Refs. 6.9 and 6.8, respectively]. These i
calculations use emergency cooling unit and containment spray start times which conservatively envelope the values generated in this calculation. Therefore, these l
P/T calculations are not impacted by this revision.
l The original analysis of record for the containment P/T response to the design basis MSLB event for equipment qualification (N-4080-004, Ref. 6.23] used emergency cooling unit and spray start times which do not envelope the values in this calculation. Calculation N-4080-004 has been revised by CCN to identify Supplement A to N-4080-027 (Ref. 6.8] as the current analysis of record for b containment P/T response to the design basis MSLB for equipment qualification.
Calculation M-0014-003 [Ref. 6.24] is an early analysis of the fill time for containment spray piping inside containment. The current piping fill analysis contained in this revision of the emergency cooling unit and containment spray 4
system startup delay times supersedes the analysis in Reference 6.24, and that calculation will be obsoleted.
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g 3.0 ASSUMPTIONS 3.1 Instrument response and ESF signal generation time is assumed to be 1 second.
This value is consistent and conservative with respect to the ESF response times calculated and used in the Plant Protection System Setpoint Calculation, CE-NPSD-570-P [Ref. 6.2]. According to sections 4.9 and 4.10 of Reference 6.2, the total ESFAS response time for either containment high pressure or high-high pressure is estimated to be 0.551 seconds, which is below the 1 second analysis response time assumed in this calculation. The 1-second response time also coincides with the combined " sensor and ESF logic" and " subgroup relay" delay times identified in General Engineering Procedure SO23-XV-6, " Technical Specification Response Time Surveillance implementing Procedure Master Ust"
[Ref. 6.3]. The 1-second ESF response time used in this calculation and in Reference 6.2 is split in to the " sensor and ESF logic" and " subgroup relay" delay times to facilitate response time testing by the Reference 6.3 procedure.
3.2 Closing time for the electrical power breakers supplying the motors for the containment spray pumps, the component cooling water pumps and the emergency cooling unit fans are assumed to be 0.4 seconds. The breaker closing time is normally a very short interval, and a typical value from vendor equipment catalog data [Ref. 6.4] shows closure times of about 4.5 cycles (0.075 seconds) for the SKv breakers used to supply the 4160 volt power to the component cooling water and containment spray pumps. The assumption of 0.4 seconds for breaker closure time will conservatively envelop the expected closure time.
i 3.3 For the loss of offsite power case, the LOOP is assumed to occur at a finite time l
following the LOCA or MSLB such that the diesel start in response to the loss of voltage signal (LOVS) occurs coincident with the generation of the safety injection actuation signal (SIAS), a SIAS/LOVS event. Since, as identified in Design input 4.5, the bounding time for the containment pressure to reach the high pressure j
analysis setpoint of 5 psig is taken to be 2 seconds following either the design basis LOCA or MSLB event and the ESF delay time to generate the SIAS is assumed to be i second (Assumption 3.1, above), the diesel generators will be j
starting 3 seconds following the design basis pipe break event.
3.4 The Agastat sequencing time delay relays used for starting the CS pumps and the CCW pumps will be assumed to actuate within 2.5 seconds of their setting. On this basis, conservative sequencing delays of 12.5 seconds (10 2.5 sec) and 17.5 g I
seconds (15 2.5 sec) will be assumed for the containment spray pumps and component cooling water pumps, respectively. These delay times are conservative
)
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g with respect to the vendor specification for sequencing time delay relay repeatability of 10% of the Agastat relay setting as shown in Reference 6.25.
3.5 The bounding time for the containment pressure to rise to the high pressure analysis setpoint of 5 psig following the design basis LOCA or MSLB pipe break event will be assumed to be 2 seconds. This time delay is based on the l
containment pressure response to the design basis steam line break event (MSLB at 102% power). For this break, the containment pressure has increased by 6.5 psi at 2 seconds following the break (Ref. 6.8]. For the design basis LOCA event, the containment pressure has increased by 11.7 psi at 2 seconds following the break (Ref. 6.9].
3.6 The bounding time for the containment pressure to rise to the high-high pressure analysis setpoint of 20 psig following the design basis LOCA or MSLB pipe break event will be assumed to be 9 seconds.
This time delay is based on the containment pressure response to the design basis MSLB at 102% power. For this break, the containment pressure has increased by about 20 psi at 8 seconds and by at lease 21.5 psi at 9 seconds following the break (Ref. 6.8]. For the design basis LOCA event, the containment pressure has increased by 20 psi at about 4.1 seconds, and by 34 psi at 9 seconds following the break [Ref. 6.9].
3.7 The containment spray piping riser is assumed to be filled with water to within 10 feet of the lower (first) ring header as required by Technical Specification Surveillance Requirement 4.6.2.1.b.4 [Ref. 6.15]. The water levelin the spray riser piping is established using Station Procedure SO23-3-3.11.2 (Ref. 6.16]
3.8 The containment spray headers are assumed to fill one at a time from the bottom ring to the top ring. As each spray ring is being filled, it is further assumed that the flow rate of water into the ring available to fill the ring is reduced by having each nozzle in the ring immediately begin leaking water at a flow rate set by an i
assumed water pressure in the ring of 5 psi above the containment pressure. This is a conservative assumption since the nozzles can only begin to leak water after i
the water reaches them, and the pressure driving the leakage would only be the static head at each nozzle location which, on average, would be expected to be less than the assumed 5 psi for the ring being filled. As the riser between the rings is filled, the full spiay rings leak water at a flow rate consistent with the 5 psi assumed for the higher ring being filled plus the static pressure between the ring being filled and the full ring below. The nozzle spray flow rate as a function of nozzle pressure drop is defined in Design input 4.11.
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Subject Containment Spray (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
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g 3.9 The filling of the spray headers will be assumed to start at the time the spray pump reaches full speed, The filling flow rate will be assumed to be 1900 gpm.
This value is conservatively chosen to be less than that calculated in Case 7 of Reference 6.1 (1949 gpm; see Design input 4.10). This flow rate is representative of the minimum value during injection mode operation with the RWST full, th 6
containment at the design pressure of 60 psig, the spray block valves full open, but without the full nozzle pressure drop as would be the case while the headers are filling. For the case of containment spray actuation with rLo LOOP, the spray block valves are only 65% open at the time the spray pump reaches full speed, l b and about 4 seconds remain before the block valves are full open (see section 8.2.1). Based on Case 5 of Reference 6.1, the filling flow rate with the valves half open would be greater than 1650 gpm, or 87% of the valves full open flow rate (1686 gpm is shown in Ref. 6.1). Using linear interpolation, the filling flow with the
' lock valves 65% open would be about 90% of the maximum filling flow rate. The b o
assumption of the maximum filling flow rate from the time the block valves are 65%
open, with the spray pump at full speed, is justified since no credit is taken for the substantial amount of water which will enter the assumed empty portion of the riser during the 1.9 seconds that the pump is accelerating to full speed while the block valves are moving from about 49% open to 65% open. It is estimated that over 40 gallons of water would enter the assumed empty portion of the spray riser 6 system, which is enough to fill the 10 feet of the initial 8" diameter riser piping and about half the horizontal 6" diameter distribution pipe in the 1st ring header before the calculation assumes any water enters the dry part of the piping system.
3.10 The spray piping filling time will be calculated for the "A" spray train (header number 1) since the total length of all 3 ring headers for this train is about 19 feet longer than that for the "B" train.
3.11 The time to accelerate the CS pump to full speed following closure of the pump breaker is assumed to be 1.9 seconds per Reference 6.26.
3.12 The time to accelerate the CCW pump to full speed following closure of the pump b breaker is assumed to be 2.5 seconds per Reference 6.26.
This value is conservative with respect to a vendor-supplied acceleration time of 2 seconds at 75% voltage shown in Reference 6.13.
4
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Project or DCP/MMP N/A Calc. No. N.4080-003 CCN CONVERSION: f CCN No. CCN -
Subject Containment Sprav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
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g 4.0 DESIGN INPUT 4.1 The analysis setpoint for containment high pressure is 5 psig [Ref. 6.2]. This value is consistent with the actual containment high pressure setpoint of 3.4 psig established in Reference 6.2 and incorporated into the Station Technical Specifications [Ref. 6.15, Unit 2 as an example]. The high pressure setpoint initiates the safety injection actuation signal (SIAS) and containment cooling actuation signal (CCAS). The SIAS signal initiates startup of the high and low pressure safety injection pumps and the containment spray pumps (P-012 and P-013) through the ESF sequencer. The CCAS signal will start the emergency cooling units (E-399, E-400, E-401 and E-402) and cause the component cooling water block valves to the emergency cooling units to open (2(3)HV-6366 through 2(3)HV-6373).
4.2 The analysis setpoint for containment high-high pressure is 20 psig [Ref 6.2]. This value is consistent with the actual containment high-high pressure setpoint of 14.0 psig established in Reference 6.2 and incorporated into the Station Technical i
Specifications [Ref. 6.15, Unit 2 as an example]. The high-high pressure setpoint initiates the containment spray actuation signal (CSAS) which causes the containment spray block valves,2(3)HV-9367 and 2(3)HV-9368, to open.
4.3 The diesel generator delay for the LOOP case is 10 seconds (Section 4.8.5.D of Ref. 6.5]. This time interval includes generator start, attainment of rated voltage and frequency, and breaker closure energizing the 4160 volt ESF bus. This value is the same as the surveillance test acceptance value of 10 seconds cited in Section 7.1.16.2.2 of Reference 6.17.
4.4 The nominal delays for sequencing the first 4 ESF load groups are [Ref. 6.6]:
Group 1 0 seconds Group 2 5 seconds l
Group 3 10 seconds Group 4 15 seconds The emergency fan cooler motors are in Group 1 [Ref. 6.6].
The containment spray pump motors are in Group 3 [Ref. 6.6].
The component cooling water pump motors are in Group 4 [Ref. 6.6].
1 As identified in Assumption 3.4, the repeat accuracy of the load group delay times is 2.5 seconds applied to the Agastat time delay relay setting.
j l
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Subject Containment Sprav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
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g 4.5 The maximum stroke time for opening the containment spray block valves, 2(3)HV 9367 and 2(3)HV-9368, is 12 seconds [Refs. 6.10 and 6.11].
4.6 The maximum stroke time for opening CCW isolation valves 2(3)HV-6366 through 2(3)HV-6373, which permit cooling water to flow through the containment emergency cooling units, is 12 seconds [Refs. 6.10 and 6.11].
4.7 (Replaced by Assumption 3.11.)
b 4.8 (Replaced by Assumption 3.12.)
4.9 The maximum time required to accelerate an emergency cooling unit fan motor to full speed following closure of the fan motor power supply breaker is 10 seconds 4
(Ref. 6.3].
This value is conservative with respect to a vendor-supplied acceleration time of 7.8 seconds at 80% voltage shown in Reference 6.14.
4.10 The spray pump flow rate delivered to the containment riser while filling of the spray ring headers is in progress (prior to establishment of full containment spray flow at design nozzle pressure drop) will be taken to be 1650 gpm with the spray isolation valve 2(3)HV-9367 or 2(3)HV-9368 one-half open and 1900 gpm with the spray block valves full open. These values have been conservatively selected to be less than the minimum flow rates calculated for cases 5 and 7, respectively, of Reference 6.1 for a 7.5% degraded spray pump drawing water from a full RWST and pumping into a 60 psig containment building during the time that the spray piping is filling, before the full nozzle pressure drop is developed.
4.11 The Sprayco 1713A hollow cone bottom ramp spray nozzles have a design flow rate of 15.2 gpm at a 40 psid nozzle pressure drop [ Appendix 2 of Ref. 6.1]. With turbulent flow conditions, the flow rate will vary as the square root of the nozzle pressure drop.
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Subject Containment Sorav (CS) & Emeroency Coolina Unit (ECU) Actuation Times Sheet No.
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g 5.0 METHODOLOGY The start times for the containment sprays and emergency cooling units are determined by combining in series (and in parallel, if appropriate) the time intervals for each action which must occur to establish a functioning heat removal system.
The constituents of the total delay times are identified below.
A. Emeraency Coolina Unit Operation 1)
Time to reach containment high pressure analysis setpoint following the design basis LOCA or MSLB 2)
Sensor and instrumentation delays to generate the containment cooling actuation signal (CCAS) 3)
Assuming LOOP, time to start the diesel generator, reach design voltage and frequency, and energize the 4160 volt ESF bus (with no LOOP, the diesel generator delay is not applicable) 4)
Time to open the component cooling water (CCW) block valves to the emergency cooling units 5)
Time for the emergency cooling unit fan motors, which are in the 1st ESF load group, to be energized and accelerate to full speed (breaker closure g time plus motor acceleration time) 6)
Also, with or without LOOP, ESF sequencing delay in starting the operable CCW pumps which start in the 4th load group 6a) With a loss of voltage signal (LOVS) on the operating CCW train (but with no LOOP) or another malfunction in the operating CCW train, the ESF sequencing delay will still apply to restoring CCW flow, but without the b diesel generator starting delay 7)
Time to accelerate the CCW pumps to full speed, restoring CCW flow, assuming a LOOP had occurred (breaker closure time plus motor p acceleration time)
NES&L DEPARTMENT CALCULATION SHEET l' "us% No.u -/
,,AoEFodo Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION: h cCN No. CCN -
Subject Containment Sorav (CS) & Emeroency Coolina Unit (ECU) Actuation Times Sheet No.
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g B. Containment Sorav System Operation 1)
Time to reach containment high pressure analysis setpoint following the design basis LOCA or MSLB 2)
Sensor and instrumentation delays to generate the safety injection actuation signal (SIAS) which initiates automatic sequencing of ESF equipment and starts the containment spray pump in the 3rd load group (with LOOP, sequencing is delayed until the ESF bus is energized by the emergency diesel generator) 3)
Assuming LOOP, time to start the diesel generator, reach design voltage and frequency, and energize the 4160 ESF bus (with no LOOP, the diesel generator delay is not applicable) 4)
Time for the spray pump motors to be energized and accelerate to full speed (breaker closure time plus motor acceleration time)
Ib 5)
Time to reach containment high-high-pressure analysis setpoint following design basis LOCA or MSLB i
6)
Sensor and instrumentation delays to generate the containment spray actuation signal (CSAS) which initiates opening of the containment spray isolation valves and allow spray water to begin filling the spray piping in containment 7)
Time to open the containment spray isolation valves 8)
Time to fill the spray rings and establish full containment spray flow
NES&L DEPARTMENT CALCULATION SHEET l RfuIl CCN NO. 4/ -/PAGE/dbF O Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION. j CCN NO. CCN - l Subject Containment Sorav (CS) & Emeroency Coolina Unit (ECU) Actuation Times Sheet No.
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6.0 REFERENCES
6.1 Supplement A to Mechanical Calculation M-0014-009, Rev. O, " Containment Spray g Pumps inservice Testing Minimum Requirements", July 28,1994 6.2 ABB-CE Calculation CE-NPSD-570-P, Rev. 03-P," Plant Protection System Setpoint Calculation", October,1991, SCE Document No. SO23-944-C50-0 6.3 General Engineering Procedure SO23-XV-6, Rev. O, thru TCN 0-2, " Technical Specification Response Time Surveillance implementing Procedure Master List",
April 27,1989 6.4 Gould Brown Bovarl Switchgear Division Bulletin 8.2-1E, "lTE Type HK Stored Energy Metal-Clad Switchgear", Table 9, page 43 (copy of page 43 provided in Appendix A) 6.5 Specification SO23-403-12, Rev. 2, " Diesel Driven Electrical Generating Sets for SONGS Units 2 and 3", October 3,1975 1
6.6 Electrical Calculation E4C-016, Rev. 5, "ESF Sequencing", May 4,1984 6.7 NCRs 93030001,2,3, and 4; Containment Spray Pumps 1 & 2 for SONGS Units 2&3 6.8 Supplements A and B to Nuclear Calculation N-4080-027, Rev. O, " Containment P/T Analysis for Design Basis MSLB", November 4,1994 and March 14,1995 b
6.9 Supplement A to Nuclear Calculation N-4080-026, Rev. O, " Containment P/T Analysis for Design Basis LOCA", February 6,1995 6.10 Engineering Procedure, SO23-V-3.5, TCN 7-32, " Inservice Testing of Valves Program", December 9,1993 6.11 Surveillance Operating Instruction, SO23-3-3.30, TCN 7-26, "in-service Valve Testing, Quarterly", September 10,1993 6.12
[ Reference Deleted]
b 4
NES&L DEPARTMENT l
CALCULATION SHEET
!Reu ccN NO. n -/
PAGE((OF30 Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN NO. CCN - l Subject Containment SDrav (CS) & Emeroency Coolina Unit (ECU) Actuation Times Sh'eet No.
18 I
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g 6.24 Mechanical Calculation M-0014-003, Rev. O, " Containment Spray Flow History",
May 28,1975 6.25 Amerace Corporation, Industrial Electrical Products Division, Bulletin E70-1, "Agastat Nuclear Qualified Time Delay Relays", E7000 Series Operating Characteristics from Specifications on Page 4 (copy of the table provided in Appendix B) l 6.26 Memorandum, D. Stickney to A. Brough, " Analysis for Obtaining a 2.5 Seconds of Relay Setting on Agastat Timing Relay for Load Sequence Timing Tolerance in g Tech Spec 4.8.1.1.2.d.13.", July 21,1995 (copy of the memo is provided in Appendix C)
NES&L DEPARTMENT CALCULATION SHEET
' '" SCN No. N -/
s 3o eREu exce or Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION: f CCN NO. CCN -- f Subject Containrnent Sprav (CS) & Emeraency Coolina Unit (ECU) Actuation Tirnes Sheet No.
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3 8.0 CALCULATIONS 8.1 Emeraency Coolina Units The timing of the automatic startup of the emergency cooling units following a design basis LOCA or MSLB, with and without loss of offsite power, is developed in the following two sub-sections. The total delay time is developed using a chronology of events approach. Timelines describing the sequence of events for emergency cooling unit startup, with and without loss of offsite power, are provided in Figure 1. The delay times associated with each component of the overall delay time, which are provided in the chronologies below, have been included on the timelines in parentheses.
8.1.1 ECU Actuation With No Loss of Offsite Power (see Figure 1.A)
(A)
DB LOCA or MSLB occurs zero seconds (B)
Containment pressure reaches the analysis 2 seconds (Assump. 3.5) setpoint for containment high pressure (5 psig, Des. Input 4.1)
^
(C)
SIAS generated 1 second after reaching LOVS occurs on operating CCW train hi pressure setpoint (without LOOP) or other malfunction (Assump. 3.1) b Sequencing of ESF equipment begins CCAS generated CCW block valves to ECUS begin to open g
ECU fan motor breaker coils energized (ECUS are in the first ESF load group per Design input 4.4)
(C')
ECU fan motors start 0.4 sec after ESF start signal; brkr closure time d (Assump. 3.2)
(D)
Emergency cooiing unit motor and fan at 10 sec after brkrs close rated speed (Des. Input 4.9)
(E)
CCW isolation valves to ECUS are fully 12 seconds valve stroke time (Des. Input 4.6)
NES&L DEPARTMENT CALCULATION SHEET WuSN No. Ar-/ PAGE/m 0F ] O 9
Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSloN: f CCN No. CCN -
Subject Contairvnent Soray (CS) & Erneroency Coolina Unit (ECU) Actuation Times Sheet No. El A REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE R
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t (F)
CCW pump motor breaker coils energized 17.5 see after ESF start
{
(CCW pump motors are in the 4"' load (Assump. 3.4) l group per Des. Input 4.4) b (G)
CCW pump motors start 0.4 sec brkr closure time i
(Assump. 3.2) i (H)
CCW pump at full speed, full CCW flow 2.5 sec after brkrs close to ECU established (Assump. 3.12)
Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to reach full speed
= A + B + C + C' + D 6
= 0 + 2 + 1 + 0.4 + 10 = 13.4 seconds Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to be at full speed with CCW block valves full open
=A+B+C+E
= 0 + 2 + 1 + 12 = 15 seconds Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to be at full speed, CCW block valves fully open, and restarted CCW pump at full flow
=A+B+C+F+G+H
= 0 + 2 + 1 + 17.5 + 0.4 + 2.5 = 23.4 seconds
= 24 seconds, rounded
}
The limiting action for establishing emergency cooling unit full operability with no loss of offsite power but with a loss of voltage signal on the operating CCW train, following a design basis LOCA or MSLB, is restarting the CCW pumps through the ESF sequencing time delay relays. The total delay time for emergency cooling unit operability in this case is 24 seconds.
1 NES&L DEPARTMENT CALCULATION SHEET lREus% NO. ev-/
noE.zo Og so Project Or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION: f CCN NO. CCN -- I Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
22 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE 1RE DATE R
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g 8.1.2 ECU Actuation With Loss of Offsite Power (see Figure 1.B)
(A)
DB LOCA or MSLB occurs zero seconds (B)
Containment pressure reaches the analysis 2 seconds (Assump. 3.5) setpoint for containment high pressure (5 psig, Des. Input 4.1) 1 (C)
SIAS generated 1 second after reaching CCAS generated hi pressure setpoint LOVS is present and EDG starts due to LOOP (Assump. 3.1)
(D)
EDG @ full speed and frequency and 10 seconds after EDG ESF bus energized start (Des. Input 4.3)
Sequencing of ESF equipment begins l
CCW block valves to ECUS begin to open ECU fan cooler motor brkr coils energized (ECUS l b are in first ESF load group per Design Input 4.4)
(D')
ECU fan cooler motors start 0.4 sec after ESF start signal; brkr closure time b (Assump. 3.2 (E)
ECU motor and fan at rated speed 10 seconds after brkrs close (Des. Input 4.9)
(F)
CCW isolation valves to ECUS are fully open 12 seconds from time valves begin to open (Des. Input 4.6)
(G)
CCW pump motor brkr coils energized 17.5 seconds after start of (CCW pump motors are in the 4*
ESF sequencing ESF load group per Des. Input 4.4)
(Assump 3.4) group per Des. Input 4.4)
(G')
CCW pump motor starts 0.4 sec brkr closure time g
(Assump. 3.2 (H)
CCW pump at full speed 2.5 seconds after brkrs g
close (Assump. 3.12)
NES&L DEPARTMENT CALCULATION SHEET gRl2 fcN NO.
a./
gAceator x Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION: j CCN No. CCN - /
Subject Containment SDrav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
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g Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to reach full speed
= A + B + C + D + D' + E
= 0 + 2 + 1 + 10 + 0.4 + 10 = 23.4 seconds Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to be at full speed with CCW block valves full open
=A+B+C+D+F
= 0 + 2 + 1 + 10 + 12 = 25 seconds Elapsed time following DB LOCA or MSLB for emergency cooling unit fan to be a full speed, CCW block valves fully open and rectarted CCW pump
= A + B + C + D + G + G' + H
= 0 + 2 + 1 + 10 + 17.5 + 0.4 + 2.5 = 33.4 seconds 6
= 34 seconds, rounded The limiting action for establishing emergency cooling unit full operability with loss of offsite power and the loss of voltage signal simultaneous with the safety injection actuation signal (SIAS/LOVS event), following a design basis LOCA or MSLB, is restarting the CCW pumps through the ESF sequencing time delay relays. The total delay time for emergency cooling unit operability in this case is 34 seconds.
l
)
0 2
N g 2
c Q
2.
h
/
/
O o
A.
ECU ACTUATION WITH NO LOSS OF OFFSITE PCbTR 7
m O
os ny o
C 2
O g
CCW block valves to ECOs C-5 3
o (12)
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Emergency Cooling Unit QZ Z
m I motor & fan at o
or MSLB
\\ECU fans I O
R M
o occurs start l rated speed a 13.4 sec E
3s C U}
8 time 0 a 3.4 sec I g
O Y
T m
c,n 63 A (2)
B (1) C (17.5)
F (0.4)
(2.5)
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N B
E I
O>
Containment SIAS generated; CCW pm p mtr CCW pump CCW pwps a futi speed; M
e o
e 2
pres reaches LOVS or other malfunction brkr coils motor design CCW flow to ECUS 3
U U
hi analysis present but no LOOP; energized starts established; ECUS fully 3
setpt a 2 sec ESF sequencing begins; a 20.5 sec a 20.9 see operational a 23.4 sec
'O 5'
5' Q
@g CCAS generated; (24 sec, rounded)
E O Z "-i O
g g
CCW btk valves to o
h 4
ECUS begin to open; o
=.
b 6
ECU fan motor brkr coils
(")
Q G
o energized a 3 see h
$ b D
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=:
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O B.
ECU ACTUATION WITH LOSS OF 0FFSITE POWER 3
(n G)
O
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{
CCW block valves to Ecus C
N N 2
/ are futty open a 25 sec 3
/
/
E g)
(12)
Ff 3
o D
f O.
k O T5 (0.4)
D' (10)
E j % mergency Cooting Unit g
/
E 3
y2 or MSLB ECU fans 3 motor & fan at g
I rated speed a 23.4 sec o
d M
8"o occurs start o
l l
3 m
a time 0 a 13.4 sec 5
d I
f I
oo 3
o oo o
Z2 A (2 B (1) C (10) 0 (17.5)
G'(0.4 G (2.5 )
H e
[
o Containment SIAS generated; EDG a full spd & freq; CCW pump mtr CCW pump CCW pumps a full speed; e
g pres reaches CCAS generated; ESF bus energired; brkr coils motor design CCW flow to ECUS 98 O
hi analysis LOVS present ESF seg begins; energized starts established; ECUS fully Zh setpt a 2 see w/ LOOP & DG CCW btk vlves to a 30.5 sec a 30.9 sec operational 3 33.4 sec g
to I @
m
,7
- y starts a 3 see ECUS begin to open; (34 sec, rounded) m g
ECU fan mtr brkr coil 3
energized a 13 sec z
19 0
o N40803F1.Wo1 C
N W
O em <mm
NES&L DEPARTMENT CALCULATION SHEET gREO CCN NO. ^> - /
gAosc O, w Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION: l CCN NO. CCN --
Subject Containment Soray (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
25 _
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g 8.2 Containment Sprav System The timing of the automatic startup of the containment spray system following a design basis LOCA or MSLB, with and without loss of offsite power, is developed in a manner similar to that used for the emergency air coolers. The time to fill the empty spray piping and ring headers inside containment is calculated separately in sub-section 8.2.3. Timelines describing the sequence of events for containment spray startup, with and without loss of power, are provided in Figure 2. The delay times associated with each component of the overall delay time, which are provided in the chronologies below, have been included on the timelines in parentheses.
8.2.1 CS Actuation With No Loss of Offsite Power (see Figure 2.A)
(A)
DB LOCA or MSLB occurs zero seconds (B)
Containment pressure reaches the analysis 2 seconds (Assump. 3.5) setpoint for containment high pressure (5 psig, Des. Input 4.1)
(C)
SlAS generated 1 second after reaching Sequencing of ESF equipment initiated hi pressure setpoint (Assump. 3.1)
(D)
Containment pressure reaches the analysis 9 seconds (Assump. 3.6) setpoint for containment high-high pressure (20 psig, Des input 4.2)
(E)
CSAS generated 1 second after reaching Containment spray block valves begin hi-hi pressure setpoint to open (Assump. 3.1)
(F')
Containment spray pump motor breaker coils 12.5 seconds after stad energized (Spray pump motors are in the of ESF sequencing O
3* ESF load group per Des. Input 4.4)
(Assump. 3.4)
(F)
Containment spray pump motor starts 0.4 sec after ESF signal; brkr closure time b
(Assump. 3.2)
NES&L DEPARTMENT CALCULATION SHEET eREuI:i CCn NO.
nt-f eAoEMOrb Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN NO. CCN - l Subject Containment Sorav (CS) & EmeroencV Coolina Unit (ECU) Actuation Times Sheet No.
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g (G)
Containment spray pump at full speed 1.9 seconds after breaker Spray block valves are about 65% open closure (Assump. 4.11) b (7.8 seconds of the 12 second valve stroke time have elapsed)
(H)
Containment spray block valves full open 12 seconds after CSAS generated (Des. Input 4.5)
(1)
Spray piping and ring headers filled and 31.1 seconds after CSP at full containment spray flow established full sped (see 8.2.3) from the spray system Elapsed time following DB LOCA or MSLB for containment spray pumps to reach full speed
= A + B + C + F' + F + G 6
= 0 + 2 + 1 + 0.4 + 12.5 + 1.9 = 17.8 seconds Elapsed time following DB LOCA or MSLB for containment spray block valves to be full open
=D+E+H
= 9 + 1 + 12 = 22 seconds Elapsed time following DB LOCA or F ' ' LB for containment spray system to be fully functional assuming full header fillir aw rate credited at time CSP reaches full speed (Assump 3.9)
= A + E - C + F' + F + G + 1 6
= 0 + 2 + 1 + 0.4 + 12.5 + 1.9 + 31.1 = 48.9 seconds
= 49 seconds, rounded The controlling actions for establishing containment spray following a design basis LOCA or MSLB with no loss of offsite power are the opening the spray block valves in parallel with the sequenced starting of the spray pumps, followed by the g actual filling of the dry containment spray riser and ring header piping. In this case the containment spray pump is at full speed about 2 seconds before the block valves are fully open, and the total delay time for establishing full containment spray flow is 49 seconds.
NES&L DEPARTMENT CALCULATION SHEET
' c=cN No. y _ f,,,ogogo fne Project or DCP/MMP N/A Calc. No. N 4080-003 CCN CONVERSloN:
j CCN No. CCN - I Subject Containment Sorav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No.
27 REV ORIGINATOR DATE IRE DATF.
REV ORIGINATOR DATE IRE DATE R
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g 8.2.2 CS Actuation With Loss of Offsite Power (see Figure 2.B)
(A)
DB LOCA or MSLB occurs zero seconds (B)
Containment pressure reaches the analysis 2 seconds (Assump. 3.5) setpoint for containment high pressure (5 psig, Des. Input 4.1)
(C)
SIAS generated 1 second after reaching LOVS is present and EDG starts due to LOOP hi pressure setpoint j
(Assump. 3.1)
(D)
Containment pressure reaches the analysis 9 seconds (Assump. 3.6) setpoint for containment high-high pressure (20 psig, Des. Input 4.2)
(E)
CSAS generated 1 second after reaching hi-hi pressure setpoint (Assump. 3.1)
(F)
EDG at full speed and frequency and 10 seconds after EDG ESF bus energized start (Des. Input 4.3) l Sequencing of ESF equipment begins Containment spray block valves begin to open with CSAS already present f
(G')
Containment spray pump motor breaker coils 12.5 seconds after start of energized (CS pump motors are in the 3'd ESF sequencing 6
ESF load group per Des. Input 4.4)
(Assump. 3.4)
(G)
Containment spray pump motor starts 0.4 sec brkr closure time 6
(Assump. 3.2)
(H)
Containment spray block valves full open 12 seconds after ESF bus is loaded with CSAS present (Des. Input 4.5)
(1)
Containment spray pump at full speed 1.9 sec after brkr closure g
(Assump. 3.11)
NES&L DEPARTMENT CALCULATION SHEET lRso"" fcN ao. u- /
,,o,24c,3o Project or DCP/MMP N/A Calc. No. N.4080-003 CCN CONVERSION: /
CCN No. CCN - I Subject Containment Sprav (CS) & Emeraency Coolina Unit (ECU) Actuation Times Sheet No. 27A REV ORIGINATOR DATE 1RE DATE REV ORIGINATOR DATE IRE DATE R
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s (J)
Spray piping and ring headers filled and 31.1 seconds after CSP at full containment spray flow established full speed (see 8.2.3) from the spray train 1
Elapsed time following DB LOCA or MSLB for containment spray block valves to be full open
=A+B+C+F+H
= 0 + 2 + 1 + 10 + 12 = 25 seconds Elapsed time following DB LOCA or MSLB for containment spray pump to be at full speed
= A + B + C + F + G' + G + 1 g
= 0 + 2 + 1 + 10 + 0.4 + 12.5 + 1.9 = 27.8 seconds Elapsed time following DB LOCA or MSLB for containment spray system to be fully functional assuming full header filling flow rate credited at time CSP reaches full speed (with all valves wide open at that time)
= A + B + C + F + G' + G + 1 + J
= 0 + 2 + 1 + 10 + 0.4 + 12.5 + 1.9 + 31.1 = 58.9 seconds b
= 59 seconds, rounded The limiting action for estab!ishing containment spray flow with loss of offsite power following a design basis LOCA or MSLB is the sequenced starting of the containment 6 spray pump and subsequent filling of the dry spray riser and ring header piping. The total delay time for this case is 59 seconds.
4 4
d
- a 51 O
O A
A.
CS ACTUATION WITH NO LOSS OF OFFSITE POWER E
E k
k k b
f )O 2
O m
i A
(9) 0 (1) E (12)
H g
g
- D 3
y O2 i
CS valves o
full open g g j
Q]
Z or MSLB pressure a generated; I
a 22 sec 3
M y
go occurs hi-hi anal CS btk vives l
O E
y a
t-s a time O setpoint begin to open i
C
$ 8 9
O d -
I a 9 see a 10 sec 3
Os r
- y ITI
-. M A (2)
B (1) C (12.5)
F' (0.4) F (1.9) G (31.1)
J fo R R O >g 8
8 zd "E
8 s
Containment S!AS gen; CS punp mtr CS pump CS pump a full speed; Full containment O
m m
pres reaches 5SF seg brkr coils motor CS btk vives a 65% open; spray established O
s.
5.
3 hi analysis begins energize starts spray piping begins a 48.9 sec 3
2 gm 1
setpt a 2 see a 3 sec a 15.5 see a 15.9 see to fill a 17.8 sec (49 sec, rounded) 8 x
x o
3 8
m o
3 o
m
=
- m S
s E
N O
8.
CS ACTUATION WITH LOSS OF OFFSITE POWER d
$ h D
C Z
03 D
'0 S
9
'O m
A (9)
D (1) E g
m z
j%CSAS
\\ \\
g h
i
/
/
l generated y
DB LOCA Cont *m't a 10 sec (12)
H O
M Q
j h
or MSLB pres a I % CS valves C
O occurs hi-hi anal I l
futt open 2!
R m
i a tp 0 setpoint i
e a 25 sec
~~
h h
O z
3 9 sec f,
g, g
g7 3
b A (2) 8 (1) C (10)
(12.5)
G' (0.4)
(1.9)
(31.1)
J Containment
$1AS gen; EDG a full spd CS pmp mtr CS pump CS pump 3 Tutt contairunent k
h O
ZZ pres reaches LOVS present
& freq; ESF brkr coils motor futt speed; spray established 3
g 88 hi analysis w/ LOOP & EDG bus energized; energize starts spray pipng a 58.9 sec m
setpt a 2 see starts ESF seq begins; a 25.5 sec a 25.9 sec begins to filt (59 sec, rounded) gg (
a 3 see CS btk valves a 27.8 sec gm t
begin to open Zh
)
a 13 sec g
g y
m r
O N40803F2.WQ1 F
lM D
\\
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$m
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l NES&L DEPARTMENT CALCULATION SHEET lReuSCN NO. v--/ eAostoh Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
f CCN NO. CCN -
Subject Containment SDrav (CS) & Emeroency Coolina Unit (ECU) Actuation Times Sheet No.
38 REV ORIGINATOR DATE BRE DATE REV I
ORIGINATOR DATE IRE DATE R
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Paul Barbour 08/28/95 Allen Evinay 08/28/95
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l APPENDIX C (3 pages)
To: Alaa Brough From: Doeg stickney Request FOR support July 21, 1995 subject: Analysis for obtaining a +/- 2.5 seconds of Relay Setting on Agastat Timing Relay for Load Sequence Timing Tolerance in Tech Spec 4.8.1.1.2.d.13.
Background:
'The agastat time delay relays used in the load sequencer have a manufacturer's stated accuracy ~of +/- 10% of relay setting.
Technical Specification (TS) requires verification that they perform with an accuracy of +/- 10% of design interval. This is a more restrictive requirement and results in many failures during Integrated ESF testing. To correct this situation, a Technical Specification change will be requested to increase the TS criteria to a value which exceeds the manufactures stated tolerance.
Some System safety analyses and procedures (i.e. NFA Calcs & IST programs) use assumptions about load sequencing and pump acceleration times. These assumptions are verified in various surveillances. A review of *.hese analyses shows that changes to NFA calculations are required to support the proposed TS change.
These required changes are discussed below.
NFA Changes for CS and CCW Pumpa Some preliminary studies have-been performed to evaluate wider allowable load sequencing deviations from a system interaction viewpoint. Based on a review of existing procedures and calculation, the only safety analysis calculations which do not presently allow for a load sequencing deviation of as much as 2.5 seconds are NFA calculations N-4080-026 and 027.
These calculations evaluate containment pressure and temperature rise following a LOCA or MSLB, and are sensitive to the start time of both containment spray and containment cooling. Timing assumptions used for these calculations are contained in calculation N-4080-003 Rev 5.
Start time for the containment Emergency Cooling Unit (ECU) is dependent both on CCW pump start and acceleration time, and valve stroke time. However, N-4080-026 & 027 calculations arbitrarily assume a start time for the ECU which matches the start of actual containment spray at 50/60 seconds (no LOP / LOP).
This assumption envelopes the start times which would result from increasing
NES&L DEPARTMENT CALCULATION SHEET
'?nEun $CN NO. N-4 eu d or_3o Project or DCP/MMP N/A Calc. No. N-4080-003 CCN CONVERSION:
CCN NO. CCN -
Subject Containment Sorav (CS) & Enmraency Coolina Unit (ECU) Actuation Times Sheet No.
39 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE BRE DATE R
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Paul Barbour 08/28/95 Allen Evinay 08/28/95 /'\\
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s Appendix C. Continued allowable agastat delay for the CCW pump from 0.5 to 2.5 seconds (23.2/33.2 seconds). TS table 3.3-5, however, limits total response time to 21.2/31.2 seconds. As a result, surveillance procedure 8023-XV-6 limits CCW pump acceleration time to 4.5 seconds. To increase its agostat time from 0.5 to 2.5 seconds therefore, requires decreasing the allowable pump acceleration time to 2.5 seconds, and changing the TS table 3.3-5.
The containment Spray (CS) pump start times are also critical to the reference N-4080-026 E027 calculations. The analyses assume a 0.5 second load sequencing delay, which equals a CS pump breaker close time of 10.5 seconds, and an acceleration time of 4.4 seconds. A total of 26.9 seconds is available for the containment spray pump to be running at speed with valves full open' to avoid exceeding pressure and/or terrporature limits. TS table 3.3-5, however, limits this to 25.4 seconds. Since there is at most a 1.5 second margin in N-4080-026 E 27 calculations above the TS limit, changing the Tech Spec to gain 2.0 seconds for the agastat is not an option. This Technical Specification limit translates into a 3.9 second acceleration requirement, assuming a 0.5 second delay in the load sequencer. Therefore, in order to permit a 2.5 second load sequencer delay for the CS pump breakers, it is necessary to impose a 1.9 second limit for,CS pump acceleration.
Action requested:
1.
Consider +/- 2.5 second agastat deviation times, 1.9 seconds CS pump acceleration time and 2.5 seconds CCW pump acceleration time as an assumed inputs to N-4080-026 and 027 calculations.
2.
Identify any other NFA effected documents, and re-evaluate them by considering +/- 2.5 seconds instead of existing +/-
10% of design interval. -
The results of your evaluation along with evalauations and calculations performed by others for this purpose will be used as a justification and supporting evidence for Technical Specification change request.
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