ML20196H038
| ML20196H038 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 07/18/1997 |
| From: | Miskiewicz D FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML20196H022 | List: |
| References | |
| 32-1266125-02, 32-1266125-2, FP97-0003, FP97-0003-R00, FP97-3, FP97-3-R, NUDOCS 9707230295 | |
| Download: ML20196H038 (18) | |
Text
...
i i
f FLORIDA POWER CORPORATION CRYSTAL RIVER UNIT 3 DOCKET NUMBER 50-302/ LICENSE NUMBER DPR-72 TECHNICAL SPECIFICATION CHANGE REQUEST NOTICE 213, REVISION 0 ATTACHMENT B CR-315 EFPY LTOP LIMITS FPC CALCULATION FP97-0003 l
DR 5
0 02 P
1 rh 6
% Florida INTEROFFICE CORRESPONDENCE (L
2 Power
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Nuclear Engineering gol Zyo./6 /f s
M ce MAC Telephone i
SUBJECT:
Crystal River Unit 3 Quality Document Transmittal-Analysis / Calculation TO: Records Management - NR2A i
The following analysis / calculation package is submitted as the QA Record copy:
DOCNO (FPC DOCUMENT IDENTIFICATION NUMBER)
REV SYSTEM (S)
TOTAL PAGES TRANSMITTED f-97-ooo3 7-
- c, Hu
/7 j
TITLE i
c23
/f GFPY LToP uMITS KWDS (IDENTIFY KEYWORDS FOR LATER RETRIEVAL)
LTOP j
DXREF (REFERENCES OR FILES. UST PRIMARY FILE FIRST)
I VEND (VENDOR NAME) l VENDOR DOCUMENT NUMBER (DXREF)
SUPERSEDED DOCU, CC O,i4F)
FT.C l
r-91-ooo3 rea I ACV-/D ll Ac-f-/
l l
tiu f-l l
l t1 ult-31 l
ll ll l
l l
COMMENTS (USAGE RESTRICTIONS. PROPRIETARY ETC.)
-b calc ala G revdw alw L same Le Pt?-coos n.i. L are as nuiseJ L ah-F yLIrd h,ws, mLd.,
- is cale.
wn NOTE:
Use Tag number only for valid tag numbers (i.e., RCV-8, SWV-34, DCH-99), otherwise; use Part number field (i.e., CSC14599, AC1459). If more space is required, write "See Attachment" and list en separate sheet.
DESIGN ENGINEER DATE VERIFICATION ENGINEER DATE SUPERVISOR. NUCLEAR ENG.
DATE 0 N.
7!/ 1 Nb
= = ^
7h.5"lf?
cc: Nuclear Projects (if MA GW EERE Calculation Review foirn Part lli actions required M Yes O wo Return to Service Related)
Yes b No (if Yes, send copy of the form to Nuclear Regulatory Assurance and a copy of Supervisor, Confqp. Mgt. Info.
the Calculation to the Responsible Organization (s) identified in Part lil on the Mgr., Nucl. Operations Eng. (Original) W/ attach Calculation Review form.)
- 5. KoloC0 Rev 3/97
, - ~,
( N CALCULATION REVIEW b'
canvrm Page 1 of 2 CALCULATION NoJREv F-n-oo o 3 b o. 2.
PART I -
DESIGN ASSUMPTION / INPUT REVIEW: APPLICABLE 6 Yes O No The following organizations have reviewed and concur with the design assumptions and inputs identified for this calculation:
haws @, h. !Q 7[f6fj7 Nuclear Picnt Technical Support System Engr y=uwon.
Nuclear Plant Operations
.2 7// 87 oTHER(S) 6,=uwoam ju A]ua m The G a vaa S L L Y 7bshf?
i
.o 3
f f
6pauwoat.
PART11-RESULTS REVIEW: APPLICABLE E Yes U No The following organizations have reviewed and concur with the results of this calculation and understand the actions which the organizations must take to implement the results.
Nuclear Plant Technical Support System b
h 7//5Y17 Engr 89"* **
Nuclear Plant Operations
/[ f )
, ~..
Nuclear Plant Maintenance 6,=u-om.
y,,
g Nuclear Licensed Operator Training 6,.uwo..
Manager, Site Nuclear Services Yes 2 N/A l
Sr. Radiation Protection Engineer Yes 0 N/A hC_ [.ncoud;stan6 l 5.!??
UC Segnauwoai.
Rev 3/97
[, m')D CALCULATION REVIEW
\\
/*~~"-
Pm2d2 cALCULATloN NoJREV.
PART 111 - CONFIGURATION CONTROL: APPLICABLE Q Yes C No The following is a list of Plant procedures / lesson plans /other documents and Nuclear Engineering calculations which require updating based on calculation results review:
Document Date Required Responsible Organization
.f-97-000s Def _ /S'
/997 Ajac, D c & deen A,
u a
SP IS 2,. S/'-3O I. $f 451 Ajou
/S",. / 99 7 n,orn bks i
SP. m 9. Pf-149, AC-s'of.
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fo f-(., 606 8; fof 'l, o/'402.. Of-209 ; o F-30/.
O P A D 5,' OP fol; OP 'lo2,.
O P - % 4, OP -/63 i
V V
l Upon completion, forward a copy to the Manager, Nuclear Regulatory Assurance Group for tracking of actions if I
cny items are identified in Part 111.
PART IV - NUCLEAR ENGINEERING DOCUMENTATION REVIEW The responsible Design Engineer must thoroughly review the below listed documents to assess if the j
calculation requires revision to these documents. If "Yes," the change authorizations must be listed below and issued concurrently with the calculation.
Enhanced Design Basis Document E Yes O No rrce (p/4 Vendor Qualification Package O Yes % No (VoPM FSAR S Yes O No Ita=%(41 ran Topical Design Basis Doc.'
O Yes @ No (TCM l
Improved Tech. Specification E Yes O No n==a 75 CAW 53 E/SOPM O Yes E No (TCM j
improved Tech. Spec. Bases
@ Yes O No (Lam TSCay 2.13 Other Documents reviewed Config. Mgmt. Info. System E Yes O No icionagio(,rios' O Yes O No snmae coc weece Analysis Basis Document O Yes $ No (Tea O Yes O No enmoe coc meece Design Basis Dc.cument O Yes E No (Tcn O Yes O No snmoecoc e seco i
Appendix R Fire Study 0 Yes @ No rrce O Yes O No j
samaaooc eseco l
Fire Hazardous Analysis O Yes @ No (Ten O Yes O No tenmos ooc. weece NFPA Code Conformanm Document O Yes @ No (Tcc O Yes O No l
c=ce ooc weece PART V - PLANT REVIEWS / APPROVALS FOR INSTRUMENT SETPOINT CHANGE PRC/DNPO approval is required if a setpoint is to be physically changed in the plant through the NEP 213 process.
PRC Review Required Yes
@ No l
PRC Chairmar*
/Date I
i t
DNPO Review Required O Yes W No DNPO
/Date DESIGN ENGINEER /DATE DESIGN ENGINcEER - PR6NTED NAME
, /$, 9 7 h, k. f'flbN!l$$4lh 0 J
Rs s. 3/97
206974 (1235)
CALCULATIONAL
SUMMARY
SHEET (CSS) m'
" 1MSNRM l
l DOCUMEN'r IDENTIFIER tt_19u19(_n1 TITLE CR-315 EFPY LTOP Ilmits PREPARED BY:
REVIEWED BY:
NAME J. A.Weimer NAME BL Boman
{
SIGNATURE SIGNATURE l
~7[/cjh TITLE (g g
DATE y/9 <J
[g g g [y,g MLE DATE g
RkFIFACE(S) 3 TM ETATEMENT: REVI' EWER INDEPENDENCE COST CENTER PURPOSE AND
SUMMARY
OF RESULTS:
4 PURPOSE Th3 purpose of the calculations provided hemin am to:
(1)
Define the 15 EFPY enable temperature.
(2)
Determine the location adjusted 15 EFPY LTOP PT limit and show that the current PORV setpoint protects this limit.
(3)
Define a maximum allowable, instrument corrected, pressurizer level for Crystal-River 3 such that the most limiting LTOP event, failed-open makeup control valve, will not violate the 15 EFPY LTOP pressure-temperature limit.
(4)
Define the makeup tank level for which a failed open makeup control valve will not violate the LTOP limit.
(5)
Provide all the appropriate assumptions and operation restrictions to implement these LTOP limits.
(6)
Show that the 0.75 in' RCS vent hole size is sufficient to maintain the pmssum below the LTOP PORV setpoint for a failed open MU control valve.
The results of this analysis are discussed on page 4.
THE FOLLOWING COMPUTER CODES HAVE BEEN USED IN THIS DOCUMENT:
CODE / VERSION / REV CODE / VERSION / REV THIS DOCUMr.NT CONTAINS ASSUMPTIONS THAT MUST BE VERIFIED PRIOR TO USE ON SAFETY.RELATED WORE YES ( !) NO (
)
CR-3 No F-97-003 Rov. 02 PAGE 1
OF 14
20004B-5 (3/97)
[sc N N o D ak NUMBER:
RECORD OF REVISION 32-12se12s-02 REV. NO.
CHANGE SECT / PARA.
DESCRIPTION / CHANGE AUTHORIZATION 01 The entire Rev. O is Different initial assumptions required a complete replaced with Rev. 01 re-calculation 02 Reference List (pg. 3)
The date and revision level of Reference 12 was corrected I
02
" Pressurizer level / initial Additions discussion was included to embellish pressurizer parameter" the pressurizer level section section (pg. 6)
DATE:
PAGE:
7/14/97 2 of 14 CR-3 No F-97-003 Rev. 02
.. -.. _ - ~. - -..
FTIDoc. 32-1266125-02 ~
J A Weimer REFERENCES J
l
'1.
PT! Doc 77-2091-00 "Pr Limits for 15 EFPY for CR-3", 8/89 i-2.
FTI Doc. 32-1176020-00 "CR-3 Cormeted P/T Limits at 15 EFPY" 8/89 3.
FPC Calculation I 97-0005, "RC Low Range Pressure Imop Accuracy, RC-131-PT
[
(LTOP Serpoint) Rev 0.
j 4.
FII Doc. 32-5000115-00 "CR-3 NPT.1, Seal Staging, DHRS, subcooling, NDT Limits" 5.
PTI Doc. 32-1259026-00, "CR-3 LTOP Setpoint for 15 EFPY' 3/97 '
6.
PTI Doc. 32-1176228-00 "LTOP Design Bases Analysis" 9/89 7.
- CR-3 Drawing 4CP-2433
}
8.
FIT Document 32-1259000-00, " Pre-Startup LTOP Set point", AD Nana, March 1997
- 9. -
- PPC Calculation I-88-0021, Revision 2.
10.
FTI Doc. 32-5000279-01 "CR-3 PORV and RCS Vent Flow" 6/97 i
11.
PTI Doc 32-1268903-00 "CR-3 Partial Pump Flow & Pressure Dist. 7/97 l
12.
FTI Doc. 32-1266172-01 "CR-3 LTOP RELAP-5 Analysis" 6/97 i'
13.
FIT Document 51-121232-01, " Key Elevations for All Plants", BR Aldefer, March 1994
}
14.
- FPC Calculation M94-W53, Revision 4.
15.
- FPC Calculation 191-0002, Revision 0, "MU Tank Level Accuracy".
16.
- FPC Calculation I-95-0015, Revision 0, " Core Flood Tank Level & Pressure Loop l
Error Evaluation".
17.
- FPC Calculation M-97-0044, Revision 0.
I
'Ihese am references controlled and retrievabic through FPC ment control system l
and can be used as acceptable references for this document.
PURPOSE...........................
........... 1 RECORD OF REVISION.................
...-.........2
)
REFERENCES............................................
..3 RE S ULT S............................................
.........4 i
LTOP LIMIT AND PORY SETPOINT..................
.4 j
NDT CURVES...................................
.....4 l
MAXIMUM ALLOWABLE PRESSURIZER LEVEL..
.4 i
MU TANK VOLUME
.5 i
LIMITING TEMPERATURE FOR CFT FLOW INITIATION....
.................5 KEY INP LTr ASSUMPTIONS........................................................
....5 PRESSURIZER LEV 5UINITIAL PRESSURE PARAMETERIZATIONS........... 6 PORV and VENT FLOW RATES....................
_6 AS S UMPTION S.....................................
.......6 INSTRUMENT UNCERTAINTIES AND LOCATION CORRECTION.
............7 I
CALCULATIONS......................
.7 PORV Setpoint...........
.7 Maximum Allowable Pressurizer Level.......................
.9 F10URES.'
.10 I
.i j
l l
CR 3 NoF.97 003 Rev. 02 Page 3 of 14 l
. _. - -~ ~
FTI Doc. 32-1266125-02 J A WIimer l
' RESULTS LTOP LIMITAND PORVSETPOINT l
The minimum LTOP allowable pressure is 464 psig as measured from the hot leg "A" j
tap per Figure 1. The base LTOP limiting curve is defmed in Reference 5 as 110% of the steady state HU/CD pressure limit as a function of temperature. The adjusted LTOP limit at 85*F is 548 psig (Reference 5) minus the 2/0 location. correction (84 i
psi). Based on the current low-range PORV setpoint of 442.6 psig and its pressure uncertainty of 11.4 psi, Reference 3, the maximum PORV opening pressure setpoint is.
454 psig. Thus, the LTOP limit is protected by the low-range PORV setpoint.
1 This LTOP limit is applicable below the enable temperature of 263 F which is the RtNDT (203 F) + 50 F (required conservatism) + 10 F (instrument uncertainty).
Figure 1 shows the entire LTOP limit up to the 263*F limit.
NDT CURVES Figure 2 shows the present 15 EFPY heatup and cooldown curve assuming the original instrument uncertainties (25 psi,10 F). Also shown is the restricted operational area due to the low-range PORV setpoint. This region of the operator curve is set to prevent challenging the PORV.
With the PORV setpoint of 442.6 psig and its pressure uncertainty of 11.4 psi, Reference 3, the minimum PORV opening pressure setpoint is 431.2 psig (rounded to 431 psig).
To provide an operating limit to preclude PORV challenge the indicated uncertainty of 16 psi, Reference 3, is subtracted from the minimum PORV opening pressure setpoint of 431 psig, to yield 415 psig as shown in Figure 2. This PORV operating limit is incorporated into the other heatup and cooldown limits, Reference 4.
MAXIMUM ALLOWABLE PRESSURIZER LEVEL The maximum allowable indicated pressure is based on the envelope of the heatup, cooldown, and restricted area shown in Figure 2.
If the RCS is at the maximum allowable Indicated pressure, a pressurizer level of 160 inches (135_ inches instrument corrected) will not allow the maximum RCS pressure to exceed the LTOP limiting curve for 10 minutes during a failed open makeup control valve event. Note that the initial conditions for the LTOP event are adjusted from the indicated conditions by the pressure and temperature uncertainty. For the NDT curves, a pressure uncertainty of 16 psi was added (i.e., if the plant pressure was at the NDT limit, the actual pressure could be 16 psi greater). For the PORV operating limit of 415 psig, an additional 10 psi was added to the 16 psi instrument uncertainty due to the fact that the current PORV setpoint could be increased by approximately 10 psi and still protect the LTOP CR-3 No F-97-003 Rev. 02 Page 4 of14
~ - -.
[
FTI Doc. 32 1266125-02 J A Weimer I
limit. Also, the initial conditions have 10 F subtracted from the NDT and PORV l
operating limit curves since the actual tempemture could be 10 F less.
o.
ne actual RCS pressure after 10 minutes of maximum makeup for 150",~ 160", and 190" initial pressurizer levels (compared with the LTOP limit) is shown on Figure 3.
Figure 4 shows an enlargement of the critical temperature for the 160" initial j
pressurizer level, i
MU TANK VOLUME If the MU tank volume depletes in less than 10 minutes, the pressurization transient will stop. He volume of water required to pressurize the RCS to the LTOP limit j
starting at 425 psig' is 27881 lb or 3342.2 gallons (Reference 12). This is equivalent j
to 88.9 inches in the MU tank per the MU tank volume equation Vgal = 31.26 x (level in inches) +562 gal as described in Reference 62. Using a conservative makeup tank level uncertainty of approximately 3 inches (2.7" in Reference 15), this means that if the MU tank is less than 86 inches (indicated), the LTOP limiting curve cannot j
be reached during the 10-minute transient from initial pressures discussed above.
i LIMITING TEMPERATURE FOft CFTFLOWINITIATION The maximum calculated CFT pressure is 638 psig, Reference 16. If the CFTs are
{.
- not isolated from the RCS, the LTOP lirrit can be protected by raising the RCS temperature above the value corresponding to an RCS pressure of 638 psig. For the 15 EFPY LTOP limit, Table 2, this temperature is 197*F, uncorrected. Correcting i
for the 10 F uncertainty provides a procedural limit of 207 F.
KEYINPUTASSUMPTIONS i
Other results pertinent to this analyses include the input assumption that no RC pumps can operated below an indicated RCS temperature of 95*F (85*F uncorrected and 10 F c
i uncertainty) and. the third RC pump cannot be operating below 230 F (220*F uncorrected and 10 F uncertainty).
He LTOP 10-minute transient assumed the pressure location corrections associated with these pump combinations. While the i
maximum allowable pressurizer level and LTOP limit would accommodate fourth RC i
pump start above 235"F, core lift considerations would preclude fourth RC pump start below the LTOP enable temperature.
f 1 This is conservative relative to the 431 psig lowest PORV openmg pressure.
' 2 Note that Reference 17 shows a slightly different MU tank total volume equation.
CR 3 No F-97-003 Rev. 02 Page5of14
FTIDoc. 32 1266125-02 J A Waimer l
PRESSURIZER LEVEUINITIAL PRESSURE PARAMETERIZATIONS A higher initial pressurizer level can be tolerated if the initial pressure is less than the NDT limit discussed above. Calculations of the pressurization during the 10 minute failed open makeup control valve transient were conducted as a function of initial pressure and pressurizer level, Reference 12.
Using the LTOP limit as the maximum allowable pressure, the maximum allowable pressurizer level vs RCS pressure relation hip was developed as shown in Figure 5. For example, if the indicated RCS pressure was 198 psig, the maximum allowable j
indicated pressurizer level would be 220 inches.
l l
PORVand VENTFLOWRATES l
Reference 10 demonstrates the adequacy of a 0.75 in' RCS and the 1.049 in' PORV to provide sufficient flow to prevent RCS pressurization above the LTOP limit. The RCS vent conservatively provides a discharge of 345 gpm at 431 psig (the lowest PORV opening pressure) and a temperature of 212 F versus the failed open makeup control valve flow rate of i
340.5 gpm at the same RCS gw aure. The PORV will provide a steam flow of 4.1 ft'/s at 431 psig which is far in excess of the failed open makeup control' valve flow rate of 0.8 ft'/s.
[
In addition, values of PORV steam, liquid water, and nitrogen flow rates were calculated at i
the revised PORV setpoint of 442.6 psig. Thus, the revited Table 4-1 FSAR Values should be:
i l
-Low Pressure Open Setpoint '
442.6 psig j
=
i Low Pressure Closed Setpoint 392.6 psig
=
j Design Capacity 14,180 lb./hr
=
j Liquid Capacity @442.6 psig 505 gpm (@l00 F)
=
160 gpm (Saturated Liquid)
=
Nitrogen Capacity @442.6 psig 20,560 lb./hr
=
i i
j ASSUMPTIONS The results presented herein are based on the following assumptions and inputs:
(1)
The first reactor coolant pumps will not be started until the monitored RCS temperature is greater than, or equal to, 95 F.
Accounting for the DHRS temperature uncertainty of 10*F, the analyzed first reactor coolant pump temperature start is 85*F. ~ The reactor coolant pump start temperatures affects the hot leg pressure tap to reactor vessel beltline pressure differential l
correction (i.e., location adjustment)
(2)
The minimum allowable temperature for the third reactor coolant pump start will l
be 230*F (220 F analyzed and 10 F uncertainty).
L 1
CR-3 No F-97-003 Rev. 02 Page 6 of14
- -. -... - - - -. -. -. - ~. -.. - - - _. -
i FTI Doc. 32-1266125 02 J A Weimer l
(3)
' The pressurizer pressurization rates are based on the makeup system i
configuration discussed in Reference 12. They are approximately 330 to 365
[
gpm at RCS pressures less than 500 psig.
4 INSTRUMENT UNCERTAINTIES' AND LOCATION CORRECTION j
Since this evaluation only applies to LTOP considerations (up to 263F and below 464 psig), the wide range pressure uncertainty is not applicable and only low range pressure will be addressed. The 15 EFPY NDT curves used a 25 psi pressure uncertainty and a 10 F temperature uncertainty. Since these are conservative relative
, to more recent uncertainty calculations, they will not be changed.
t j
The LTOP limit does not use an uncertainty explicitly but rather the indicated pressure uncertainty is added to the operator curve limits to form the starting point of the LTOP I
. transients. This analysis will use the 15.2 psi Iow range uncertainty (rounded to 16 psi) r; per Reference 3 and will be used for all pressure indications herein.
ne decay heat outlet temperature uncertainty is 6.8 + 2.5 readability = 9.3 and the i
}.
RTD's are 8.3 F (see Reference 4). Herefore, since the 9.3 is bounded by the
~
original 10 F uncertainty,10 F will be used for the LTOP work. Again, the LTOP limit does not incorporate this uncertainty directly but temperature uncertainty is subtracted from the operator curve limits to fonn the starting point of the LTOP i
4 transients.
The pressurizer level uncertainty is -7.47% of span, Reference 9. From, Reference.13, j
l the upper tap is at 52.03 ft and the lower tap is at 24.74 ft. This corresponds to
[
-0.0747*(52.03-24.74)*12 = 24.5 inches (25" was used in the analysis).
The location pressure adjustments from the beltline to the hot leg taps during pump operation are based on Reference 11. During no pump operation, the location correction
[
is effectively a stagnation head of 23 psi (Reference. 8). These location corrections are l
shown for the appropriate temperatures below.
I CALCULATIONS
}
PORVSetpoint The PORV setpoint for LTOP protection must be at the minimum LTOP pressure. This i-minimum prusure is determined from the Reference 5 pressures (see Table 2 below) with location correction and instrument uncertainty added. The Reference 5 allowable pressures j
are a composite of the minimum pressure at the belt line, CL nozzle, or closure head (as a I
3 The original uncertamty was 25 psi and 10*F for the entire PT range.
CR 3 No F-97-003 Rev. 02 Page 7 of14
FTIDoc. 32 1266125-02 J A WGimer l
function of temperature).- These pressures are 110% of the steady state heatup/cooldown limit.
1 l
The Reference 5 pressures (shown in Table 2 below) continually increase with temperature.
The location adjustment to the "A" ard "B" hot legs, however, are a function of the number i
of RC pumps operating, Reference 11. Since the number of operating pumps is the key component of the locxtion adjustment, pump operating me.rictions must be set to assure a 4
reasonable LTOP minum pressure. Typical location adjustments are 80-100 psi for 2 or 3 pump operation and 23 cd ~or zero pump. operation, Reference 8. Since the combination of the surge line limit and the seal staging limit, Reference 4, prevents RC pump operation i
below 95'F, this will be chosen as the minimum temperature for RC pump operation. The 5
actual pump start was assumed at 85'F to account for temperature uncertainty.
j Figure 1 shows the minimum LTOP setpoint limit for CR-3 to be 464 psig at 85 F. The 0/2 l
pump combination will have a smaller location correction and therefore the 2/0 case is ccoservative for all startup cases.
5 4
Table 2 Reference 5 LTOP plus Adjustments 4
i Base LTOP 00 l
2/0 l
0/2 l
2/1 Press Mmus 110% SS LOCATION CORRECTION
]
P, psig -
T, *F Psid Psid Psid Psid poig 525 70 23 85.00 32.74 102.00 502.00 i
545 80 23 84.00 32.68 102.00 522.00 548 85 23 84.00 32.66 102.00 525.00 1
548 85 23 84.00 32.66 102.00 464.00 551 90 23 84.00 32.64 102.00 467.00 i
558 100 23 84.00 32.60 101.00 -
474.00 567 110 23 84.00 32.55 101.00 483.00 575 120 23 84.00 32.49 101.00 491.00 581 125 23 84.00 32.46 101.00 497.00 614 150 23 83.00 32.30 100.00 531.00 661 175 23 83.00 32.10 100.00 578.00 E88 195 23 82.00 31.92 99.00 606.00 728 200 23 82.00 31.87 99.00 646.00 775 121 23 82.00 31.75 99.00 693.00 808 220 23 82.00 31.67 98.00 725.00 808 220 23 82.00 31.67 98.00 709.00 825 225 23 81.00 31.61 98.00 727.00 849 230 23 81.00 31.56 98.00 751.00 964 250 23 81.00 31.32 97.00 867.00 985 253 23 81.00 31.28 97.00 888.00 All location adjustments are rounded up to the next highest whole number.
i i
CR-3 Na F.97-003 Rev. 02 Page 8 of14
l FTIDocI 32 1266125-02 J A Weimer 1
1
]
The RCS pressure must not exceed this pressure (464 psig) until the RCS temperature is i
greater than the RtNDT plus 50*F conservatism plus the temperature uncertainty (10 F). This is 263*F. Therefore, during a heatup or cooldown, the RCS cannot exceed 464 psig until the i
RCS is greater than 263*F indicated. Figure 2 shows where this limit is lower (more conservative) than the NDT heatup and cooldown limits.
i 1
]
Maximum Allowable Pressurizer Level The maximum allowable pressurizer level was calculated by first detennining the maximum allowable pressure increase (during the 10 minute MU tunsient). The initial RCS pressure 1
1 was assumed to be the maximum allowable operating pressure. This value was either: (1) the i
NDT heatup or cooldown limit with 16 psi added for the indicated pressure uncertainty, or (2) l the 415 psi PORV operating limit with 16 psi added for the indicated pressure uncertainty and 10 psi for the PORV setpoint margin (i.e., the current setpoint could be increased by approxiinately 10 psi and still protect the LTOP limit). Prior to reaching the PORV operating l
limit, the cooldown NDT limit is more restrictive than the heatup limit except for a small region between 210 and 230*F (see Figure 2). Beyond the LTOP enable temperature (263'F), the heatup NDT is the limiting curve.
I Starting from the minimum enveloping curve on Figure 2, the 10 minute MU transient pressure was added to the initial pressure assuming a 150" and 190" initial pressurizer level.
1 This added pressure was based on Reference 12. A simple linear equation was developed describing the 10 minute pressurization rate. 'Ihis was:
1 Final Pressure = 0.833* Initial Pressure - 41.6 for 190" initial pressurizer level and j
Final Pressure = 0.666* Initial Pressure - 58 for 150" initial pressurizer level Figure 3 shows these results. The 190" case exceeded the LTOP limit at approximately l
180F. The 150" case was below the LTOP limit for the entire temperature ange. The 160" l
case (interpolated from 150" and 190") will approach the LTOP limit at 195 F. Note that the 2/0 pump combination was assumed for the pressure location correction until 230 F. Figure -
4 shows an enlargement of the critical temperature for the 160" initial pressurizer level. This figure shows that there is approximately 10 psi additional margin to the LTOP limit at the present POLV setpoint.
i i
5 l
CR 3 No F-97-003 Rev. 02 Page 9 of14
FTl Doc. 32-1266125-02 l
FIGURE 1 CR-3 15 El-PY LTOP LIMIT 1100~
s' 1050
/
/
1000 A
LTOP Limit at Hot Leg w/ Loc Adjustments 950
- -110% Steady State LTOP Limit
/
3 900
=
4'=
Minimum Allowable LTOP Limit (464 psig) 3
{
k 850
/
}
e
/
/
Ei 800 E
/
l e
750 700 Y
' /
650
/
p 3
600 550 8'
./
exM...
400 350 300 50 100 150 200 250 300 RCS Temperature (F)
CR-3 No F-97-003 Rev. 02 PAGE 10 of 14
FTlDoc. 32-1266125-02 FIGURE 2 15 EFPY NDT COOLDOWN & HEATUP LIMITS 800 750
/
t 700 0
15 EFPY Coo! dawn Limit
[
~ 650
--e--LTOP Restricted Area (415 psig) 6:, 600 g
2
- - - 15 EFPY Heatup Limit
/ e'"
g 550
[.'
e e
/.'
goo f
/s 4
=
450
?
l 8 400
[
o I
350 7'
us f
0 E 300
.- y j
250 200 150 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 RCS Temperature (F)
CR-3 No F-97-003 Rev. 02 PAGE 11 of 14
FTl Doc. 32-1266125-02 FIGURE 3 15 EFPY LTOP 10 MIN MU TRANSIENT PRESSURE INCREASE 900
[
--e-Minimum of 15 EFPY Cooldown/Heatup i
8M
--m-10 MIN Transient Pressure (150 in. Pzr Level)
[
U d'
-*--Hot Leg Corrected LTOP Pressure Limit I /
~ 700 o
y
- - - 10 MIN Transient Pressure (160 in. Pzr Level) f p _,,_,, _.,
9:.
- - 10 MIN Transient Pressure (190 in. Pzr Level) -
/
5 f
E 000 j
(
l 5
r I
e y
I p
500
- s
-y
[
cn t
] 4og y
,s
+-o- +- -+ - - ----4 o
/
I
, W o
g 3M l
f o.--
._m t
1 200 100 l
50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 RCS Temperature (F) i CR-3 No F-97-003 Rev. 02 PAGE 12 of 14 l
32-1266125-02 FIGURE 4 15 EFPY LTOP 10 MIN MU TRANSIENT PRESSURE INCREASE 750
/
700
[...
/
f
}650 f..- *,/
s S
A 600 -
t r eso a
O Min 15 EFPY HU/CD Plus PORV Set Point u) 500
--m-10 MIN Transient Pressure (150 in. Pzr Level)
O A
Hot Leg Corrected LTOP Pressure Limit
- - - 10 MIN Transient Pressure (160 in. Pzr Level) -
450 400 190 195 200 205 210 215 220 225 230 235 240 245 250 RCS Temperature (F)
CR-3 No F-97-003 Rev. 02 PAGE 13 of 14 1
FIGURE 5 Maximum Allowable Pressurizer Level vs. RCS Pressure i
260 (214 psig, 24s in.)
instrument Corrected i
240 -----------------------3 t-------------
16_psig,_.25_ inches -
m
\\
~
e g
Uncorrected 3
220 o
\\------------
t
.C
\\
i (198 psig,220 in.)
\\
l S
---\\-----------------------------
> 200 0
\\
1 i
J
\\
\\
l 0 180
.N
\\
(
3
\\
6 t
\\ f (286 psig,160 in.)
5 m
i M 160 O
D u
140 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
w w
(270 psig,135 in.)
-^
m l
l l
l
'l m
120
-^w 0
100 200 300 400 500 t
i Pressure, psig i
CR-3 No F-97-003 Rev. 02 Page 14 of 14 I
-