ML20205A282
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E.1. Mrocrka 8-25-83 Form Approved by Station Sr.'erintendent effective Date STATION PROCEDURE COVER SHEEl f
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IDENTIFICATION Number E0P 577 Rev.
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Title Emergency RPV Depressurization Emergency Proceaun Prepared B.w W. R. Mccellum 8.
REVIEW I have reviwed the above procedure and have found it to be satisfactory.
TIT! E SIGNATURE DATE
- 2. 4'8/9 DEPARTMENT HEAD M&' l^9" W
Z7 ca MLh6 kAhv C.
UNREVIEVE0 SAFETY QUESTION EVi.tVATION 00CUMENTATION REQUIRED:
(Significant change in procedure method or scope
/
YES [4 NO C ]
as described in TSAR)
(If yes, document in PORC/SORC meeting minutes)
ENVIRONMENTAL IMPACT (Adverse environmental impact)
YES [ ]-
NO /]
(If yes, document in PORC/SORC meeting minutes)
O.
PROCEDURE REQUIRES PORC/SORC REVIEW YES [
NO [ ]
E.
PORC/SORC ADPROVAL SORC Meeting Number NM/ 7 F.
APPROVAL AND IMPLEMENTATION
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The attached procedure is hereby approved, and effective on the date below:
N O &
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S t a t i o n/ S e rv i c e /U n i&5 up e r i n t e nd e n t Effective Date SF-301 Rev. 6 O
feram sigle P
Emergency RPV Depressurization E0P 577 Page 1 Rev. 1 Unit 1 Emergency RPV Depressurization Emergency Procedure PAGE NO.
EFF. REV.
1-4 1
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LT[P1 os/ECT1vts Free E0P 571. 574. 575, 576, s78. 540 A
l Initiate IC l Reduce RPV pressure b
open All APR Yelves Reduce RPV pressure d
if ( 4 sRV's Are open. Use Reduce RPV pressure Alternate Systees
-* Co to E0P 57R 'RPV Flooding" 04
-900 to E0P 571 'RPV Pressure Control" CR
-tGo to E0P 576 "RPV Level Restoration" ot r
-t Go to E07 575 'RPV Level /h Power Contr$1" l
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References:
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Emergency Procedure Guidelines, Millstone Unit One I
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Emergency Procedure Guidelines, Appendix B 3)
Emergency Procedure Guidelines, Appendix C 4)
ACP-QA 3.02, Attachment A
- O E0P 577 Leergency RPV Depressurization
Emergency RPV Depressurization E0P 577 Page 2 Rev. 1
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PURPOSE v
The purpose of this procedure is to rapidly depressurize the RPV to allow injection systems to inject and restore RPV water level to an acceptable level above -127" (TAF).
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ENTRY CONDITIONS 2.1 This procedure is entered from the following Emergency Procedures 2.1.1 E0P 571 "RPV Pressure Control" 2.1.2 E0P 574 "RPV Steam Cooling" 2.1.3 E0P 575 "RPV Level / Power Control" 2.1.4 E0P 576 "RPV Level Restoration" 2.1.5 E0P 578 "RPV Flooding" 2.1.6 F0P 580 "Containment Control" 3.
OPERATOR ACTIONS V
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAteAAAAAAAAAAAAAAA CAUTION Cooldown rates > 100*F/hr may be required to accomplish this step.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA4AAAAAAAAAAAAAAAAAAAAAA 3.1 IF Boron injection is required and all make Jp into the RPV
[exceptfromBoroninjectionsystemsandCRO)hasbeenterminated
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and prevented, OR, E Boron injection is not required THEN perform the following:
NOTE The Main Condenser is the preferred heat sink and should be j
used (if imediately available) prior to using the SRV's.
3.1.1 Initiate the Isola'. ion Condenser 3.1.2 IF Suppression Poci water level is > 6 ft (CRP 925 U 1630 A,B) g 3 2 open all 4 APR valves.
E0P 577 Emergency RPV Oaoressurization
Emergency RPV Depressurization E0P 577 Page 'a Rev. 1
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M IIWtCit;n t(Qute(p(NT5 A.
k.iower Centrol (EOP $72) 1.
If the h is not shut donm erwl Sepressten Peel Teeperature reaches 110*F.
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O E0P 577 Emer,
~ RPV Depressurization
C Emergency RPV Depressurization E0P 577 Page 3 Rev. 1
( T 3.1.3 IF any APR valve cannot be opened
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THEN open other SRVs until 4 valves are open.
namaneannannanannananmanananmaananmananamannannamanamannamananamanzanaam CAUTION Defeating isolation interlocks may be required to accomplish the following step.
AAAAAAAAAAAAAAnaAAAARRRRAAAAAmeA222 TAR 22222AA24244A442222222A4tRAmeA$mmA 3.1.4 IF less than four SRV's are open, AND RTV pressure is at least 50 psig aSove Suppression Chamber pressure.
THEN rapidly depressurize the RPV using one or more of the following subsystems in an order that will minimize radioactive release to the environment:
3.1.4.1 Main Turbine Bypass Valves.
3.1.4.2 Steam Jet Air Ejectors, e,.
_ __ 3.1.4.3 CR0
. Head Spray 3.1.4.4 Main Steam Line Orains.
3.1.4.5 RPV Head Vent.
3.1.4.6 Iso Cond Tube Side Manual Vent.
3.1.5 Exit this procedure and GO T0 the appropriate procedure listed, consistent with the following conditions:
3.1.5.1 IF E0P 577 was entered from E0P 576, or E0P 574 THEN GO TO E0P 576 "RPV Level Restoration" step 3.4 3.1.5.2 IF E0P 577 was entered from E0P 575, THEN GO TO E0P 575 "RPV Level /Rx Power Control", Step 3.4 AND E0P 571 "RPV Pressure Control" Step 3.5.
3.1.5.3 IF RPV Flooding is required, THEN GO TO E0P 578 "RPV Flooding".
O E0P 577 Emergency RPV Depressurization
Emergency RPV Depressurization E0P 577 Page 3a Rev. 1 l
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C0 01710 5 a(00!st e apV FL000! W t
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RPY Level Coe SN1 (IOP 570) 1.
RPV water level connet be determined.
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Cantainment Centrol (IOP $40) 1.
Drywell tesperature reacMs tM REY $4twration feeperature.
2.
Sworessten Chamber pressure cannot be setntainej below the i
Primary Containment Design P,ressure.
C.
RPV Level Restoratien (E07 576) 1.
RPY water level cannot be determined.
I O.
RPY Level /Am Power (t0F.575) 1.
RPY water 1svel cannot be determined, and Rm Power cannot be deterstned er natntained eneve m.
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Emergency RPV Depressurization E0P 577 Page 4 Rev. 1
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'f 3.1.5.4 OTHERWISE GO TO E0P 571 "RPV Pressure j
Control" step 3.5 i;
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E0P $77 Emergency RPV Depressurization F
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