ML20204J914

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Rev 3 to Emergency Operating Procedure FR-S.1, Response to Nuclear Power Generation/Atws
ML20204J914
Person / Time
Site: Millstone, Haddam Neck, 05000000
Issue date: 06/03/1988
From:
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20204H467 List: ... further results
References
FR-S.1, NUDOCS 8810250281
Download: ML20204J914 (7)
v • d • e


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JUN 0 31980 NUMBER TTTIE REV. ISSUE /DATE FR S.1 RESPONSE TO NUCLEAR POWER Rev. 3 GENERATION / ATWS i

A. PURPOSE This procedure provides actions to add negative reactivity to a core which is observed to be critical when expected to be shutdown.

B. SYMPTOMS OR ENTRY CONDITIONS This procedure is entered from:

1. E 0, REACTOR TRIP OR SAFETY INJECITON, Step 1, when reactor trip is not veriDed and manual trip is not effective.
2. F 0.1, SUBCRITICALITY Critical Safety Function Status Tree ,

on either a RED or ORANGE condition.

i l

8010250203 ongoo7 Page 1 of 7 ,

DR ADock 0500021a p PDR

a JUN 0 31986 NUMBER TIT U REV. ISSUE /DATE FR S.1 RESPONSE TO NUCLEAR POWER Rev.3 GENERATION / ATWS i

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: STEPS ONE THROUGH FIVE ARE IMMEDIATE ACTION STEPS.

1 VERIFY REACFOR TRIP:

a. Push reactor trip button
b. Check the following: b. Perform the following:

o Reactor trip breakers OPEN o Manually insert control rods.

o Neutron Dux - DECREASING o All rod bottom lights - LIT o De-energize 480 V buses 4 and 7, by performing the following:

1. Open 480 V bus supply breakers 4841 and 4971.
2. Check open 480 V tie breakers 4T5 and 671.

2 VERIFY TURBINE TRIP:

a. Push turbine tria button
b. Check both tur sine trip valves - b. Manually run back turbine.

CLOSED IE turbine can b'QIbe run back.

THEN close all four main steam line trip valves.

3 VERIFY FW PUMP RUNNING:

a. Check at least one main feedwater a. Check AUTO AUX feedwater pump - RUNNING actuated.

IE b'QI actuated.

THEN manually stan auxiliary feedwater pumps.

b. Open all four feedwater bypass valves
c. Establish total auxiliary feedwater flow greater than 640 GPM Page 2 of 7

JUN 0 31986 NUMBER TTTIE REV. ISSUE /DATE FR S.1 RESPONSE TO NUCLEAR POWER Rev.3 GENERATION / ATWS STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 4 VERIFY REACTOR SUBCRmCAL:

a. Check power range channels - a. QQIQ Step 5.

LESS THAN 5 %

b. Check intermediate range b. QQIQ Step 5.

start up rate -

NEGATIVE

c. Restore 480 V buses 4 and 7 by perform the following:
1. Close 480 V supply breakers:

o 4841 and 4971 QR o 4T5 and 6T7

2. Reset 480 V lockout relays:

o 27Y-4 and 27Y-4B for bus 4 o 27Y-7 and 27Y-7B for bus 7

3. Close MCC supply breakers as necessary
4. Stan service water and component cooling water pumps as necessary
d. RERJRNIQ procedure and step in effect Page 3 of 7 l

JUN 0 31988 NUMBER Tnu REV. ISSUE /DATE F R.S.1 RESPONSE TO NUCLEAR POWER Rev. 3 GENERATION / ATWS STEP ACTION /EXPECED RESPONSE RESPONSE NOT OBTAINED 5 INITIATE EMERGENCY BORATION OF RCS:

a. Emergency borate using charging pump:
1. Align boration flow path: 1. E boration flow path EQI aligned.

TEEN Q.QIQ Step 5 b.

a. Open BA MOV-366, boric acid to charging pump suction
b. Oxn BA MOV 373 Q1 BA MOV-32, RWST to

, charging pump suction valve

c. Oose CH MOV 257
2. Check running QR st.ut a charging 2. E no charging pum available, pump by"taking control switch to THEN QQIQ Ste 5 b.

the "Trip then to the "Stan" position

3. Stan one boric acid pump 3. E no boric acid pump available.

THEN QQIQ Step 5 b.

4. QQIQ Step 5 e
b. Emergency borate using metering pump:
1. Open BA MOV 349, metering pump suction from BAMT
2. Close CH AOV 278, metering pump suction frem VCT
3. Stan metering pump
4. Increase pump speed to maximum
c. Align charging flow path:
1. Check OI.MOV 292B and 1. Oxn GI MOV 292B and Cil MOV 292C OPEN C f.MOV 292C.
2. Manually adjust GI FCV 110 QR CH FCV Il0A for maximum flow Page 4 of 7

JUN 0 31988 NUhGER TTT12 REV. ISSUE /DATE FR S.1 RESPONSE TO NUCLEAR POWER Rev.3 GENERATION / ATWS I

STEP ACTION / EXPECTED RESPONSE RESPONbh NOT OBTAINED 5 d. Check PRZR pressure - d. Verify PRZR PORVs and block LESS THAN 2350 PSIG valves open.

IE E0Iopen.

THEN manually open PORVs and block valves.

WHEN PRZR pressure is less than 2150 PSIG, THEN close PORVs and block valves.

c. Adjust letdown flow as necessary to maintain PRZR !cvel 6 CHECK THE FOLLOWING TRIPS HAVE OCCURRED:
a. Reactor trip a. Dispatch an operator to locally trip reactor trip breake s.
b. Turbine trip b. Dispatch an operator to locally trip turbine.

7 VERIFY FEEDWATER FLOW MANUALLY START PUMPS AND GREATER THAN 640 GPM ALIGN VALVES AS NECESSARY.

8 VERIFY ALL DILUTION PATHS ISOLA 17.D:

a. Check primary water to blender- a. Isolate prinury water to blender.

ISOLATED

b. Check primary water to charging b. Lxally close BA V-367.

suction, BA V 367 -

ED i

l Page $ of 7

JUN 0 31988 NUMBER TTT12 REV. ISSUE /DATE FR S.1 RESPONSE TO NUCLEAR POWER Rev.3 GENERATION / ATWS

(

STEP ACT10N/EXPECIED RESPONSE RESPONSE NOT OBTAINED 9 CHECK FOR REACTIVITY IE UNCOVrROLLED COOLDOWN INSERTION FROM UNCONTROLLED NQIIN PROGRESS, RCS COOLDOWN: THEN QQIQ STEP 13.

o Check RCS temperature -

DECREASING IN AN UNCONTROLLED MANhTR 2

o Check SG pressures-ANY DECREASING IN AN UNCONTROLLED MANbTR 10 CHECK MAIN STEAM LINE TRIP MANUALLY CLOSE MALN STEAM VALVES CLOSED LINE TRIP VALVES.

11 IDENTIFY FAULTED SG(s):

a. Check pressures in all SGs: a. GQIQ Step 12.

o Any SG pn:ssure decreasing in an uncontrolled manner 2

o Any SG completely depressurized 12 ISOLATE FAULTED SG(s): MANUALLY DE LOCALLYCLOSE VALVES AS NECESSARY.

o Isolate main feedline o Isolate AFW flow o isolate steam sup sly to atmospheric vent and terry turame Page 6 of 7

JUN 0 31985 NUMBER TITLE REV. ISSUE /DATE FR.S.1 RESPONSE TO NUCLEAR POWER Rev.3 GENERATION / ATWS STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAlhTD 13 VERIFY REACTOR SUBCRITICAL: CONTINUE TO BORATE.

o Check power range channels - IE BORATION EQI AVAILABLE, LESS THAN 5 % THEN ALLOW THE RCS TO HEAT UP.

o Check intennediate range PERFORM ACTIONS OF ORIER start up rate - FUNCTION RESTORATION NEGATIVE PROCEDURES IN EFFECT WHTCH DO NOT COOLDOWN OR OT11ERWISE ADD POSITIVE REACITVITY TO THE CORE.

RETURN I.Q STEP 4.

14 RESTORE 480 V BUSES 4 AND 7, PERFORM THE FOLLOWING:

a. Close 480 V supply breakers 4841 and 4971
b. Reset 480 V lockout relays:

o 27Y-4 and 27Y-4B for bus 4 o 27Y-7 and 27Y-7B for bus 7

c. Close MCC supply breaken as necessary
d. Start service water and component cooling water pumps as necessary NOTE: BORATION SHOULD CONTINUE TO OBTAIN ADEQUATE SilUTDOWN ofARGIN DURING SUBSEQUENT ACTIONS.

15 RETURNIQ PROCEDURE AND STEP IN EFFECT END Page 7 of 7

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