ML20214T497
| ML20214T497 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/18/1987 |
| From: | SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| Shared Package | |
| ML20214T470 | List: |
| References | |
| E.03, E.3, NUDOCS 8706100294 | |
| Download: ML20214T497 (17) | |
Text
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O EFFECTIVE DATE i
02-18-87
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LOSS OF SUBCOOLING I
POST TRIP WINDOW
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SATURATION
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'SUBC00 LED SECONDARY MARGIN SYSTEM SATURATION TEMPERATURE
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.s INFORMATION PAGE h
i 1.1 To prevent mechanical damage to all the RCPs only two RCPs, one in each loop, should be operated. If they fail, the two pumps which were idle should be started even if mechanical damage is again likely.
1 2.0 HPI should be initiated by actuating SFAS Channels 1A and 1B at panel HIRC ONLY. and IMMEDIATELY opening RCP seal return valves SFV-24004 and SFV-24013.
If pressurizer level is recovered during HPI, the pressurizer g
may not be at saturation conditions, and pressure control 'may
_not be as stable as expected.
3.1 AFW must be started any time OTSG level is required to be controlled at 95% (381" EFIC) 3.2 Imvel will control at 50% (317" EFIC) if "ECC SETPOINT" is not selected when RCP's are tripped 3.3 If RCP's are still running, the "ECC SETPOINT" cannot be actuated.
3.4 CONTfNUOUS AFW flow raises OTSG thermal center above 951 invel increase may be gradual to avoid overcooling i
E flow must be continuous and level must HQI decrease.
AFW X&I be throttled to hold a constant level during an OVERC0011NG regardless of setpoint.
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4.0 A.65 " Radiation Detection Gaseous System".
l A.52 " Hydrogen Monitor and Purge System".
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E.0a IDSS OF SUBCOOIJNG CAUTION IF RCPS ARE NOT TRIPPED WITHIN TWO MINUTES, THEN ONE (1) PER IDOP MUST BE LEFT RUNNING UNTIL SCM IS RESTORED.
- 1. 0 TRIP ALL RCPs TMMEDIATELY
.1 2 the RCPs are 10.I tripped within the required 2 minutes i
.IHEt[ shift to 1 RCP per loop.
(
)
.1 2 the rimaing RCPs trip before SCM is recovered
.THEt[ start the non tripped RCPs.
2.0 INITIATE AND CONTROL HPI (RULES 1 and 2).
.1 Manually initiate SFAS Channels 1A and 1B.
O
.1 Immediately take manual control and open RCP
. seal Return Yalves. (SFV-24004 and STV-24013) e--
.2 Balance HPI Flow
- 3. 0 MANUALLY INITIATE EFIC CHANNEIE A & B i
AND INITIATE "ECC SETPOINT" FOR CHANNEIS A & B (RULE 3)
.1 2 any RCPs are ri==ia:
.IHEt[ manually raise OTSGs level to the "ECC SETPOINT".
(381" EFIC or 957.)
4.0 PLACE RB H.' MONITORS (AE-53811, AE-53812)
AND R-15100 IN SERVICE O
Rev. 1 E.03 ~
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INFORMATION PaGE h
5.0 Typical loss of SCM Trace Due to Overcooling I
POST TRIP r
Tg SATURETION CURVE VARIABIE SUBC0012D SECONDARY
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MARGIN N
7 SATURATION -
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~ TEMPERATURE 6.0 Acoustic monitors for pressurizar code safeties, EMOV, Vent and Hot Img Vents should be checked on IDADS for indication of possible leakage flow paths.
On IDADS - RCS - Z1122 to Z1141, Z9109 to Z9120 for position indication open/olosed or in % open/ closed.
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O E.03 LOSS OF SUBCOOllNG 1
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5.0 IE EXCESSIVE HEAT TRANSFER EXISTS (GUIDELINE 3) i 4
.1 Go to E.05, " Excessive Heat Transfer",
otherwise continue.
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i 6.0 ISOLATE POSSIBLE RCS LEAKS I
.1 SFV-22025 Imidown Isolation Valve
.2 HV-21505 EMOV Block j
.3 PSV-21511 EMOV i
.4 HV-21510 PZR Spray Block j
.5 PV-21509 PZR Spray Valves PV-21520 I
.6 HV-21515 PZR Vents i
HV-21517 i
HV-21528 i
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HV-21522 i
.7 SFV-70003 PZR Samples SFV-70001 HV-21518 l
.8 HV-20533 Hot Leg Vents HV-20534 O
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l HV-20580 1
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l 7.0 E SUBC00 LING MARGIN IS RESTORED i
(GUIDELINE 1)
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.1 Go to Step 12, otherwise continue.
3 8.0 E SUPERHEATED (GUIDELINE 5)
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.1 Go to E.07, "lCC.", otherwise continue.
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9.0 E CORE FLOOD TANKS ARE EMPTYING
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Go to CP.101, a
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10.0 E PRIMARY TO SECONDARY HEAT TRANSFER EXISTS IN BOTH OTSGs (GUIDELINE 2) rum 1
Go to CP.103, otherwise continue.
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.2-INFORMATION PAGE h
11.0 Typical loss of Heat Transfer Trace after a Loss of SCM.
I POST TRIP WINDOW That
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s.oa LOSS OF SUBC00 LING 11.0 IE PRIMARY TO SECONDARY HEAT TRANSFER IS LOST IN ONE OR BOTH OTSGs (GUIDELINE 2)
THEN
.1 Go to E.04, " Loss of Heat Transfer".
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STATUS THE RCS IS SATURATED. A SMALL BREAK IS INDICATED. CORE COOLING IS PROVIDED BY ONE OTSG WHILE HPI MAINTAINS RCS INVENTORY.
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9, i
INFORMATION PAGE h
NOTE Any water put into the pressurizer to recover level is or will be subcooled when subcooling margin is regained. Even though the pressure may be artificially held up by compressing the steam bubble, the time frame to achieve a true saturate pressure will be dependent on the degree of subcooling and the amount of water in pressu'rizer that must be heated to saturation. If the Pressurizer low level cut off (40" indicated) de-energized pressurizer heaters, they have to i
be reset at H1RC for groups 2-3-4.
12.0 Typical Loss of SCM after an SCM Recovery.
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RCS temperature dropped below 500*F and exceeded a 100*F/hr cooldown rate.
D.E RCS temperature dropped below 500*F and RCPs are off and HPI flow exists through any HPI injection valve as indicated on the HPI flowmeters.
The PTS limit takes priority over the fuel pin in compression limit.
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E.03 LOSS OF SUBcoouNG 1
STATUS ENTRY FRoM STEP 7 ADEQUATE SUBCooLING MARGIN HAS BEEN ESTABLISHED I
12.0 JE ADEQUATE SUBC00 LING MARGIN IS LOST DURING THE FOLLOWING STEPS OF THIS PROCEDURE (GUIDELINE 1)
THEN
.1 Go BACK to Step 8, otherwise continue.
I.
13.0 THROTTLE HPI AS NECESSARY TO PREVENT EXCEEDING THERMAL SHOCK LIMITS IE tt.ermal shock limits have been exceeded MN
.1 Stablize temperature and pressure below the Interim Brittle Fracture curve and DEPRESSURIZE if in the restricted region. Pressurizer spray, pressurizer vents or EMoV can be used as required to avoid or exit the i
restricted region. (FIGURE 1)
.2 The PTS limit remains in effect for the remainder of the cooldown.
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INFORMATION PAGE g
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I 15.0 ECC setpoint will reset upon first RCP start. It will have to be activated again if RCP's cannot be run continuously.
15.1 RC Pump start interlocks.
<30% Reactor power RCP motor oil lift > 1750 psig RCP motor upper bearing oil level 2 inches a
RCP. motor' lower bearing oil level i 2 inches.
W.
Seal injection flow > 3 gpm RCP CCW flow > 307 gym To start fourth RCP T. > 500 7 Motor 86 Lockout (Motor Protection Relay)
Normal - Green Light Dim i
Abnormal - Green Light Bright i
15.2 Normal pump start cycle limits apply.
i Number of allowed RCP motor successive starts with motor i
initially at ambient temperature is 3 starts.
Number of allowed successive starts with motor initially at t
j rated temperature is 2 starts. An interval of 20 minutes 1
with motor running, or 40 minutes with motor not running, j
must elapse before an additional start.
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16.0 When the Condenser is available, use TBV's.
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i E.03-12
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IDSS OF SUBCOOLING.
I CAUTION DO NOT DELAY BETWEEN STEPS 14 AND 15 14.0 TAKE MANUAL CONTROL AND CLOSE OTSG A AND B ADVs AND TBVs CAUTION STARTING RCPs MAY CAUSE SIGNIFICANT DECREASES IN RCS TEMPERATURE, PRESSURIZER LEVEL, RCS PRESSURE, AND SUBC00 LING MARGIN DUE TO THE POSSIBILITY OF VOIDS IN THE SYSTEM.
.1 Preferred RCP starting sequence is D, B, A & C.
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.2 2 SCM is 1ost when si.rtin, RCP l
.IHEN allow RCP to run up to 2 minutes while q
attempting to recover SCM, otherwise continue.
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1 16.0 STABILIZE Tc AT PRESENT VALUE WITH i
TBVs OR ADVs 17.0 IE RCPs CANNOT BE RUN
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.1 Go to OP B.4, Section 6.0, otherwise continue.
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IASS OF SUBC00 LING l
18.0 E PRIMARY TO SECONDARY HEAT TRANSFER l
IS LOST (GUIDELINE 2) 32iEN I
.1 Go to E.04, "Ioss of Heat Transfer",
otherwise continue.
i 19.0 OPEN PZR SPRAY BLOCK VALVE (HV-21510)
.1 Verify RCS pressure does not decrease.
f 20.0 E AN SGTR IS INDICATED (GUIDELINE 4)
.IHEN
.1 Go to E.06, "SGTR", otherwise continue.~
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STATUS
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RCS IS SUBC00 LED WITH RCPs RUNNING AND CORE COOIJNG BY OTSG.
21.0 GO TO SECTION CP.105 i
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REACTOR COOLANT SYSTEM INTERIM FRACTURE LIMIT NO FORCED FIM AND THERMAL SHOCK OPERATING REGION 4
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NOTE:
Maintaining the reactor SATURATEN 3000-coolant subcooled takes precedence CURVE over the Interim Brittle Fracture ysM \\
l Curve (B&W 74-1122501 page 8)
NO FORCED FIDW
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