ML20205B287

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Rev 1 to Emergency Operating Procedure EOP 35 ES-0.3, Natural Circulation Cooldown W/Steam Void in Vessel (W/Rvlms)
ML20205B287
Person / Time
Site: Millstone, Haddam Neck, 05000000
Issue date: 12/13/1985
From:
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20204H467 List: ... further results
References
EOP-35-ES-.3, EOP-35-ES-0.3, NUDOCS 8810260219
Download: ML20205B287 (8)
v • d • e


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E. J. Mroc2 1-1-85

. Fora Approved by Station Superintendent Effective Onte l STATION PROCEDURE COVER SHEET

/N 1

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.
4. If the computer is not available to measure core exit TCs, manually measure TCs.

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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  ;

d. Check letdown - IN SERVICE d. Depressurize RCS using one PZR PORV. Go to Step 4.

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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

a. Entire RCS AND RVLMS a. DO NOT DEPRES5URIZE RCS.

Head T/C's LESS THAN Retur;,to Ctep 10, 200*F

b. Go to OP 3208, PLANT C00LDOWN FINAL ,

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