ML20205B287
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E. J. Mroc2 1-1-85
. Fora Approved by Station Superintendent Effective Onte l STATION PROCEDURE COVER SHEET
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h A. IDENTIFICATION Number E0P 35 ES-0.3 Rev. 1 l Title NATURAL CIRCULATION C00LOOWN WITH STEAM VOID IN VESSEL (WITH RVLMS)
Prepared By H. K. COVIN ,
B. REVIEW 1 have reviewed the above procedure and have found it to be satisfactory.
l TITLE SIGNATURE DATE DEPARTMENT HEAD l
l C. UNREVIEWED SAFETY QUESTION EVALVATION DOCUMENTATION REQUIRED:
(Significant change in procedure method or scope YES [ ] NO [ ]
I as described in FSAR) l (if yes, document in PORC/SORC meeting minutes)
ENVIRONMENTAL IMPACT (Adverse environmental impact) YES [ ] NO [ ]
(if yes, document in PORC/50RC meeting minutes)
D. INTEGRATED SAFETY REVIEW REQUIRED (Affects res* .se of Safety Systems, performance YES [ ] NO [ ]
of safety- . sated control systems or performance of control systems which may indirectly affect safety system response.)
(If yes, document in PORC/50RC meeting minutes.)
l E. PROCEDURE REQUIRES (h30RC REVIEW YES N NO [ ]
F. (ORC /SORC APPROVAL .
h/50RCMeetingNumber 3*b7'*2dl G. APPROVAL AND IMPLEMENTATION The attached procedure is hereby approved, and effective on the date below:
' Y Q A Station /5ergice/ Unit Superint#iident Effective Date SF 301 N'V- 7 8810260219 801007 Page 1 of 1 PDR ADOCK 05000213 P PDR l
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E0P 35 ES-0,3 Page 1 ;
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i NATURAL CIRCULATION COOLDOWN WITH STEAM V010 IN VESSEL (WITH RVLMS)
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- NATURAL CIRCULATION COOLDOWN WITH E0P 35 ES-0.3 Page 2 l STEAM VOID IN VESSEL (WIT;I RVLMS) Rev. 1 $
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o A. PURPOSE i
i This procedure provides actions to continue plant cooldown and depressurization to cold shutdown, with no accident in progress, under conditions that allow for the potential formation of a void- l
' in the upper head region with a vessel level system available to l monitor void growth. l J i B. ENTRY CONDITIONS j This procedure is entered from E0P 35 ES-0.2, NATURAL CIRCULATION j C00LDOWN, after completing the first eleven steps. i r
l This procedure was written for Modes 1, 2 and 3 near no load :
i conditions. Using this procedure when not in these modes !
l requires a step by step evaluation to determine if the required I
! action is still applicable to current plant conditions. {
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. NATURAL CIRCULATION C00LDOWN W11H E0P 35 ES-0.3 Page 3 STEAM VOID IN VESSEL (WITH RVLMS) Rev. 1 :
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-- g?IP ACTH)NitXPECTED RESPONSE RESPONSE NOT OSTMNED CAUTION
, 1. If SI actuation occurs during this procedure ECP 35 E-0, REACTOR TRIP OR SATETY INJECTION, should be performed.
- 2. The first eleven steps of E0P 35 ES-0.2, NATURAL CIRCULATION -
COOLDOWN should be performed before continuing with this procedure.
. NOTE
- 1. Foldout page should be open.
- 2. RCPs should be run in order of priority (2,1. THEN 3 or 4) to provide normai PZR spray.
- 3. If conditions can be established for starting an RCP during this procedure Step 1 should be repeated.
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- 5. If auxiliary spray is required during procedure performance, maintain spray flow and throttle charging flow as necessary for proper plant control.
1 Try to Restart an RCP
- a. Establish conditions for a. Go to Step 2.
starting an 9CP, per OP 3301D, RCP OPERATION
- b. Check RVLMS head Icvel b. Perform the following AED plenam level -- 100%
- 1) Increase PZR level to approximately 90%
using charging and letdown.
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- 2) Establish subcooling ,
> 70*F by dumping steam to atmosphere t
- c. Start one RCP c. Go to Step 2.
l d. Go to OP 3208. PLANT l C00LD0kN CFkes-1 3 44
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- i NATURAL CIRCULATION C00LDOWN WITH E0P 35 ES-0.3 Page 4 '
STEAM VOID IN VESSEL (WITH RVLMS) Rev. 1 STEP ACTIONIEXPECTED RESPONSE RESPONSE NOT OBTAINiQ l
NOTE f
Saturated conditions in the P7R should be established before trying to decrease PZR level.
2 Establish PZR Level To Accommodate Void Growth a Place PZH level controls in manual
- b. Check PZR level - b. Control charging and BET %IEN 20% AND 30% letdown as necessary.
3 Continue RCS Cooldown And Initiate Depressurization
- a. Maintain cooldown rat.e in RCS cold legs -
< 100*T/HR
- b. Maintain RCS subcooling (j
xs hased on core exit TCs -
> 50*r
- c. Maintain RCS temperature I and pressure to the right '
of the 60*F/HR curve on Tech Spec figure 3.4-3 i RCS COOLDOWN LIMITATIONS ;
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- e. Depressurire RCS using auxiliary spray O
0 % Va-1 3 44
NATURAL CIRCULATION C00LDOWN WITH E0P 35 ES-0.3 Page 5 STEAM VOID IN VESSEL (WIT}l RVLMS) Rev. 1 0 --
STEP ACTHM0tXPECTED RESPONlt RESPONlt NOT QBTAINED NOTE With a steam void in the vessel head, decreasing PZR pressure will cause the void to expand and PZR level to increase.
4 Control PZR Level
- a. Level - > 20% a. Control charging and .
letdown, as necessary, to increase PZR level to >
20%.
- b. Level - < 90% b. Perform the following
- 1) Turn on PZR heaters to maintain PZR pressure stable.
- 2) Decrease PZR level to
< 90% by one of the following a) Control charging and letdown as necessary.
- OR -
b) Continue cooldown to shrink RCS inventory, 5 Check RVLMS plenum level Repressurize RCS to maintain GREATER TilAN OR EQUAL TO 82% RVLMS GREATER THAN 82%.
Return to Step 3.
6 Check If S1 Accumulators Should Be Isolated
- 4. Check PZR pressure 4. DO NOT Isolate S!
< 1000 psia Accumulators. Continue with Step 7. Vl(EN requirements met, THEN do Step 6b.
- b. Close the St Accumulator b. IF any accumulators Isolation valves and OPEN cannot be isolated THEN
Accumulator Isolation vent off pressure from x_- motor supply breakers appropriate unisolated accumulators CPN661 S S4
NATURAL CIRCULATION C00LDOWN WITH E0P 35 ES-0.3 Page 6 STEAM VOID IN VESSEL (k'ITH RVLMS) Rev. 1 i
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STEP ACTION. EXPECTED RESPONSE RESPON$t NOT OBTAINED 7 Maintain Letdown Flow
- a. Open letdown orifice isolatier. valves as necessary
- b. Adjust low pressure letdown control valve setpoint as necessary 8 Maintain RCP Seal Injection Flow between 8 to 13 spm 9 Check if RHR System Can Be Placed in Service
- a. RCS temperature - a. Return to Step 3.
< 350*F
- b. RCS pressure - b. Return to Step 3. '
< 390 PSIA
- c. Place RHR System in service
~ as follows:
- 1. OP 3310A, RESIDUAL HEAT REMOVAL SYSTEM
- 2. OP 3208 PLANT COOLDokN
- d. Disable all but one chargint pump and as least one SI pump prior to cooling down to < 350*F
- e. Arm cold overpressure protection system 10 Continue RCS Cooldown To Cold Shutdown O
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e NATURAL CIRCULATION C00LDOWN WITH E0P 35 ES-0.3 Page 7 STEAM VOID IN VESSEL (WITH RVLMS) Rev. 1 U)
- STEP ACTION,tXPECTED RESPONSE RESPONSE NOT OSTAINED 11 Continue Cooldown Of Inactive Portion of RCS '
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- a. Cool upper head region 1. IF the head cannot be ,
using CRDM fans cooled by CRDM fans THEN '
use vessel head vent excess letdown,
- b. Cool SG U-tubes by dumping ;
steam from all SGs [
- c. RVLMS head and plenum c. Return to Step 10.
level - 100%
CAUTION !
Depressurizing the RCS before the entire RCS is
< 200*F may result in additional void formati e in the RCS. i O 12 Determine If RCS Depressurization Is Permitted
Head T/C's LESS THAN Retur;,to Ctep 10, 200*F
- b. Go to OP 3208, PLANT C00LDOWN FINAL ,
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