ML20116J833

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Rev 2 to SDG-6, AP600 Response to Unexpected RCS Temp Changes During Shutdown
ML20116J833
Person / Time
Site: 05200003
Issue date: 07/31/1996
From:
WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML20116J585 List:
References
SDG-6, NUDOCS 9608140097
Download: ML20116J833 (17)
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Text

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O BACKGROUND INFORMATION FOR AP600 SHUTDOWN EMERGENCY RESPONSE GUIDELINE SDG-6 O AP600 RESPONSE TO UNEXPECTED RCS TEMPERiTURE CHiNGES DURING SHUTDOWN Rev.2 July 31,1996 WESTINGHOUSE ELECTRIC CORPORATION ENERGY SYSTEMS BUSINESS UNIT ADVANCED TECHNOLOGY BUSINESS AREA P.O. BOX 355 PITTSBURGH, PENNSYLVANIA 15230 O c :88: u ts:8:e F PDR suc6473196 REVISION: 2

TABLE OF CONTENTS Section faya

1.0 INTRODUCTION

1-1

2.0 DESCRIPTION

2-1 3.0 RECOVERY / RESTORATION TECHNIQUE 3-1 3.1 High-Level Action Summary 3-1 3.2 Key Utility Decision Points 3-2 4.0 DETAILED DESCRIPl' ION OF GUIDELINE 4-1 4.1 Detailed Description of Steps, Notes, and Cautions 4-1 4.2 Step Sequence Requirements 4-7 O

Oi sDG6-073196 i REVis!ON: 2

1.0 INTRODUCTION

Guideline SDG-6, RESPONSE TO UNEXPECTED RCS TEMPERATURE CHANGES DURING SHUTDOWN is a Shutdown Guideline (SDG) that provides procedural guidance if unexpected RCS temperature changes occur during plant shutdown conditions. '

There is only one explicit transition to the guideline SDG-6. It is from the Shutdown Safety Status Tree, SDF-0.I, on a ORANGE priority if unexpected RCS temperature changes occur (e.g., other  !

than during a controlled heatup/cooldown or filling the refueling cavity etc.). .

After all the actions in guideline SDG-6 are completed, the operator is instructed to retum to the appropriate plant procedure.

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2.0 DESCRIPTION

O Guideline SDG-6, RESPONSE TO UNEXPECTED RCS TEMPERATURE CHANGES DURING SHUTDOWN provides actions to respond if unexpected RCS temperature changes occur. This  ;

guideline is entered on an ORANGE priority on the Shutdown Safety Status Tree when the operator l has determined that a controlled heatup or cooldown is not in progress and changes occurring in  !

RCS temperature are not anticipated or expected. When the RCS is being cooled by the RNS. RCS  !

temperature can change unexpectedly as a result of malfunctions in the RNS or the RNS support  ;

systems i.e., component cooling water system and service water system.  ;

The actions of this guideline try to stabilize RCS temperature by controlling RNS operation, checks l RNS suppon systems for causes of the unexpected RCS temperature change and verifies RCS  !

temperature is stable after corrective action is taken. l t

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sDG6.(T13196 2-1 REVIsloN: 2 j

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O 3.0 RECOVERY / RESTORATION TECHNIQUE The objective of the recovery / restoration technique incorporated into guideline SDG-6 is to provide actions to respond to an unexpected RCS temperature change during plant shutdown. I The following subsections provide a summary of the major action categories of operator actions and the key utility decision points for guideline SDG-6, RESPONSE TO UNEXPECTED RCS ,

TEMPERATURE CHANGES DURING SHUTDOWN.

3.1 High Level Action Summary k

A high level summary of the actions perfonned in SDG-6 is given on the following page in the form of major action categories. These are described below in more detail.

. Attempt To Stabilize RCS Temperature By Controlling RNS Operation The RNS controls RCS temperature by automatically contmiling cooling wa.er flow to the l

RNS heat exchanger. A malfunction in the temperature control instrumentation that causes  !

an unexpected RCS temperature change would require manual actions to be taken by the operator to stabilize RCS temperature. l

. Determine Cause Of The Unexpected RCS Temperature Chance I Actions are initiated to evaluate operations of the RNS support systems, which are the  ;

component cooling water and service water systems. This guideline assumes the RNS pumps are operating, therefore, assuming power is available. Suppon system operation is adjusted as necessary to restore stable RCS temperature.  ;

e RCS Temperature is Checked For Stable Conditions i

Corrective actions taken in this guideline ase verified to be effective in stabilizing RCS temperature prior to leaving this guideline. If these guideline actions were not successful in restoring RCS temperature control before RCS temperature reaches 200*F, then the operator is directed to SGD-2, RESPONSE TO LOSS OF RNS DURING SHUTDOWN.  !

O SDG6 a31% ,, .1 REVis10N: 2

1 MAJOR ACTION CATEGORIES IN SDG-6

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Attempt To Stabilize RCS Temperature Bv Controlline RNS Operation a Determine Cause Of The Unexpected RCS Temperature Chance

  • RCS Temperature is Checked For Stable Conditions l

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sDo683196 3-2 REVISION: 2

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-____ . . _ _ _ _ ______.z_____ __ __ _ _ _ _ . , _ __ . . _ _ . _ _ _ _ , _ , _ . _ . _ _ . . , _ _ . _ . _ , _ _ _ _ __ __!

e 4.0 DETAILED DESCRIPTION OF GUIDELINE This section provides a very detailed discussion of the generic guideline SDG-6 to facilitate EOP writing and training efforts. By presenting guideline background information in greater detail through the use of a structured format (i.e., step description tables, step sequence tables, and logic diagrams), plant applicability can be more easily detennined. The separate and unique subsections  !

containing this information follow.

4.1 Detailed Description of Steps, Notes, and Cautions This section contains a one-page (or more) step description table for each separate guideline step, note, and caution. Notes and cautions are always presented relative to the step they precede. ,

The Step Description Tables for the steps and associated notes and cautions of guideline SDG-6 are presented on the following page.

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SDG6@3196 41 REVIsloN: 2 j

l STEP DESCRIITION TABLE FOR SDG-6 i

STEP 1 STEP: Try To Stabilize RCS Temperature By Controlling RNS Operation As Necessary PURPOSE: To attempt stabilizing RCS temperature by making nonnal RNS system adjustments or manually if the RNS temperature control instrumentation malfunctions BASIS:

RNS/RCS temperature is controlled by controlling cooling water flow to the RNS heat exchanger.

The operator attempts to adjust RNS operation as necessary to stabilize RCS temperature. If a malfunction occurs in the temperature control instrumentation, the operator can manually control RNS operation to stabilize RCS temperature.

ACTIONS:

Stabilize RCS temperature by controlling RNS operation INSTRUMENTATION:

l RNS/RCS temperature indication CONTROL /EOUIPMENT:

Automatic RNS/RCS temperature contmis with manual capability KNOWLEDGE:

N/A ADDITIONAL INFORMATION:

N/A O

S006-073196 42 REVIsloN: 2

STEP DESCRIITION TABLE FOR SDG-6 STEP 2 - NOTE NOTE:

Flooding of the reactor cavity for refueling will result in RCS temperature decreasing to the IRWST temperature PURPOSE To alert the operator that a change in RCS temperature can be expected because of this operation BASIS:

The IRWST contains a large volume of cool (around containment ambient temperature) water used for filling the refueling cavity during reactor refueling. Water transfer is accomplished using RNS.

Therefore RNS/RCS temperature will decrease to a new stable lower temperature during this process.

ACTIONS:

N/A INSTRUMENTATION:

N/A CONTROL /EOUIPAENT:

O N/A KNOWLEDGE:

N/A

_ ADDITIONAL INFORMATION:

N/A O

soo64r/3196 43 REVISION: 2

STEP DESCRIFFION TABLE FOR SDG-6 STEP 2 STEP: Determine Cause Of Unexpected RCS Temperature Change PURPOSE To evaluate operation of the appropriate system (s) that may have caused the unexpected RCS temperature change BASIS:

Actions are initiated to evaluate operation of the various RNS support systems so that corrective action can be taken to restore stable RCS temperature conditions.

ACTIONS:

Determine cause of unexpected RCS temperature change Evaluate operation of the following RNS supporting systems:

RNS CCS SWS Adjust operation of the RNS, CCS or SWS as necessary INSTRUMENTATION:

Instrumentation to determine operating performance status of:

- RNS CCS SWS CONTROL /EOUIPMENT:

1 Controls to adjust operation of RNS, CCS and SWS l KNOWLEDGE: I N/A ADDITIONAL INFORM ATION:

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i sDo64n3196 44 REVislON: 2 l l

STEP DESCRIITION TABLE FOR SDG-6 STEP 3 STEP: Check RCS Temperature - STABLE PURPOSE: To determine if recovery actions were effective BASIS:

Stable RCS temperature is checked to verify recovery actions were successful prior to exiting this guideline.

ACTIONS:

Check if RCS temperature is stable INSTRUMENTATION:

RCS/RNS temperature indication with tending capability CONTROL /EOUIPMENT:

N/A KNOWLEDGE:

N/A PLANT-SPECIFIC INFORMATION:

N/A O  ;

i SDG6473196 4-5 REVIsloN: 2 j

l STEP DESCRIPTION TABLE FOR SDG-6 STEP 4 STEP: Go To Appropriate Plant Procedure PURPOSE: To direct the operator to the proper procedure following completion of the steps in this guideline BASIS:

Now that the guideline steps have been completed, the operator should continue plant operation and/or recovery going to the apps;priate normal plant procedure or abnonnal plant procedure.

ACTIONS:

Go to appropriate plant procedure INSTRUMENTATION:

N/A CONTROL /EOUIPMENT:

N/A KNOWLEDGE:

N/A PLANT-SPECIFIC INFORM ATION:

N/A O

soc 64ri3196 46 REVISION: 2

, 4.2 Step Sequence Requirements Os -

j This section consists of a table which presents the existing guideline sequence and identifies the  :

i allowed interchangeability of guideline steps for the benefit of the EOP writer. '

The Step Sequence Table for SDG-6 is provided on the following page. The interchangeability of guideline steps is identified by the numbers in the column to the right of each guideline step.

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O SDo6m31% 47 REVislON: 2

STEP SEQUENCE FOR SDG-6 STEP SEOUENCE 1.

Try To Stabilize RCS Temperature By Controlling RNS Operation As Necessary 1

2. Determine Cause Of Unexpected RCS Temperature Change 2
3. Check RCS Temperature - STABLE 3
4. Go To Appropriate Plant Procedure 4 O

O spo6m3196 48 REVISloN: 2

1 O

Instructions for the AP600  ;

Emergency Response Guidelines Manual Shutdown Safety Status Tree Tab Section REMOVE INSERT No. SDF-0.1 No. SDF-0.1 Shutdown Safety Status Tree Shutdown Safety Status Tree Rev.17/28/95 Rev. 2 7/31/96 O SDG-1 Rev.1,7/28/95 SDG-1 Rev.2,7/31/96 SDG Rev.1, 7/28/95 SDG-2 Rev.2,7/31/96 SDG-3 Rev.1,7/28/95 SDG-3 Rev.2,7/31/96  ;

SDG-4 Rev.1,7/28/95 SDG-4 Rev.2,7/31/96

SDG-5 Rev.1,7/28/95 SDG-5 Rev.2,7/31/96 2

SDG-6 Rev.1,7/28/95 SDG-6 Rev.2,7/31/96 Shutdown Guideline

{ Footnote Definition j -

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SDG-1 RESPONSE TO LOSS OF RCS '

O INVENTORY DURING SHUTDOWN l l

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Number Title Rev /Date SDG-1 RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 A. PURPOSE The purpose of this guideline is to provide the actions necessary for maintaining core cooling and protecting the reactor core in the event that PRZR level is lost during shutdown operations when the RCS is intact or RCS level is too low to support operation of the RNS pumps during operation in reduced inventory conditions in the RCS.

B. SYMPTOMS OR ENTRY CONDITIONS This guideline is entered from SDF-0.1, SHUTDOWN SAFETY Critical Safety Function Status Tree on an ORANGE condition.

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Number Title Rev./Date SDG-1 RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE f RESPONSE NOT OBTAINED 1 Check If RNS Pumps Should Be Stopped:

a. RNS pumps - ANY RUNNING a. Go to Step 2.
b. RCS hot leg level - LESS b. Continue with Step 2. H RCS THAN (SLO 2) level decreases to less than (SLO 2) and RNS pumps start to cavitate, M stop RNS pumps.
c. RNS pumps - CAVITATING c. Continue with Step 2. H RNS pumps start to cavitate, E stop RNS pumps.
d. Stop RNS pumps 2 Verify RCS Drain Path Isolation Manually close valves as necessary. j e RNS IRWST return valve l

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  • Letdown l

NOTE The RCS is considered open when an opening exists that cannot be closed from the control room such as a SG manway.

3 Check RCS Status - OPEN H reduced inventory operations were in progress, M go to Step

4. H RQl, M go to Step 15.

4 Verify Stage 1, 2 and 3 ADS Manually open valves as Valves - OPEN necessary.

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Number Title Rev./Date SDG-1 RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION

  • Personnel working in containment should be warned before refilling the RCS to avoid inadvertent contamination of personnel working near RCS openings.
  • If RCS hot leg level remains less than (SLO 2) for greater than 30 minutes, automatic alignment for IRWST injection should be verifled.

5 Refill RCS

a. Refill RCS using CVS makeup a. Jf CVS makeup can 1101 be pumps as necessary established, IllEN refill the RCS using any of the

. [ Include additional AP600 following:

details in E0Ps]

e CMTs.

-0R-4 l

e Gravity feed using the IRWST to RNS suction line.

-0R-e Gravity feed using the IRWST injection line.

b. Refill RCS until RCS hot leg level greater than (SLO 2) l 6 Identify And Isolate Any RCS Leakage

]

7 Check RCS Hot Leg Level - GREATER Continue with Step 11. luiEN RCS THAN (SLO 2) hot leg level greater than (SLO 2), IllEN do Step 8.

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Numb 1r Title SDG-1 Rev./Date RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE O

RESPONSE NOT OBTAINED CAUTION Starting an RNS pump may result in an RCS level decrease due to shrink or void collapse.

8 Try To Restore RNS Flow:

a. Start one RNS pump e [ Include additional AP600 details in E0Ps]
b. Maintain RCS hot leg level -

GREATER THAN (SLO 2)

c. RNS flow - RESTORED c. Go to Step 11.
d. Establish desired RCS cooldown rate
e. Go to appropriate plant procedure 9 Check If Fourth Stage ADS Should Be Actuated:
a. CMT level - LESS THAN (SLO 5) a. Perform the following:
1) H CMT level decreases to less than (SLO 5), E do Steps 9b and c.
2) E RCS hot leg level indication decreases to less than (SLO 4), M manually actuate fourth stage ADS and do Steps 9b and c.
3) Continue with Step 10.
b. Verify fourth stage ADS b. Manually open valves as isolation valves - OPEN necessary.
c. Verify IRWST injection c. Manually open valves as isolation valves - OPEN necessary.

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l Number Title SDG-1 Rev./Date RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED  ;

10 Check IRWST Level:

a. IRWST level - LESS THAN a. Perform the following:

(SLO 6)

1) WHEN IRWST level less than (SLO 6), IllEN do Step 10b.
3) Go to Step 11.
b. Verify containment sump b. Manually align valves as recirculati;n valves - OPEN necessary.

11 Initiate Actions To Protect Personnel Working In Containment:

a. Evacuate non-essential personnel in containment O

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b. Periodically monitor containment radiation conditions 12 Initiate Actions To Establish Containment Closure:

. Equipment hatch

  • Personnel hatch ,

e Containment purge and exhaust system e [ Include additional AP600 details in E0Ps]

13 Start Available Containment Fan Coolers 14 Return To Step 3 Page 5 of 12

Number Title SDG-1 Rev./Date RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 Check If CMTs should Be Actuated:

a. PRZR level - LESS THAN a. Go to Step 22.

(SLO 1)

b. CMT injection valves - OPEN b. Manually open valves as necessary.

16 Verify PRHR Actuated:

Actuate PRHR Initiation. IE

. Verify PRHR isolation valves -

valves will 110I open, M '

manually open valves as OPEN necessary.

17 Check If ADS Should Be Actuated:

a. CMT level - LESS THAN (SLO 3) a. If RCS hot leg level indication greater than (SLO 4), M go to Step 22.

If 11Q1, E manually I actuate ADS.

b. Verify first stage ADS b. Manually open valves as isolation valves - OPEN necessary.
c. Check second stage ADS c.

valves - OPEN M (ST01) seconds have elapsed from first stage ADS signal, E verify second stage ADS valves open. IE fiDI, M manually open second stage ADS valves as necessary.

j

d. Check third stage ADS d.

valves - OPEN M (ST02) seconds have elapsed from second stage ADS signal, M verify third stage ADS valves open.

If fiQI, M manually open third stage ADS valves as necessary.

e. Align RNS to inject into RCS O

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Number Title Rev./Date SDG-1 RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 18 Check If Fourth Stage ADS Should Be Actuated:

a. CMT level - LESS THAN (SLO 5) a. Perform the following:
1) 1E CMT level decreases to less than (SLO 5), JHEN do Steps 18b and c.
2) lf RCS hot leg level indication decreases to less than (SLO 4), JHEN manually actuate fourth stage ADS and do Steps 18b and c.
3) Continue with Step 19.
b. Verify fourth stage ADS b. Manually open valves as isolation valves - OPEN necessary.
c. Verify IRWST injection c. Manually open valves as isolation valves - OPEN . necessary.

19 Check IRWST Level:

a. IRWST level - LESS THAN a. Perform the following:

(SLO 6)

1) WilEN IRWST level less than (SLO 6), IllEH do Step 19b.
3) Go to Step 27.
b. Verify containment sump b. Manually align valves as recirculation valves - OPEN necessary.

20 Evaluate Long Term Plant Status 21 Go To Appropriate Plant Procedure Page 7 of 12

Number Title Rev./Date SDG-1 RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION

  • Personnel working in containment should be warned before refilling the RCS to avoid inadvertent contamination of personnel working near RCS openings.

22 Maintain PRZR Level - GREATER THAN (SLO 1)

a. Maintain PRZR level using a. If CVS makeup can RQI be CVS makeup pumps as established, IllEN maintain necessary PRZR level using any of the following:

. [ Include additional AP600 details in E0Ps] . CMTs.

-0R-e Gravity feed using the <

IRWST to RNS suction 1 line.

-0R-l e Gravity feed using the i IRWS1 injection line.

23 Check If CMT Injection Should Be Isolated

a. PRZR level - GREATER THAN a. Continue with Step 24. kuiER (SLO 1) PRZR level greater than (SLO 1), IllEH do Step 23b. l l
b. Close CMT injection valves l

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Number Title SDG-1 Rev./Date RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION Starting an RNS pump may result in an RCS level decrease due to shrink or void collapse.

24 Try To Restore RNS Flow:

a. RCS hot leg level - GREATER a. Go to Step 25.

THAN (SLO 2)

b. Start one RNS pump

. [ Include additional AP600 details in E0Ps]

c. Try to maintain PRZR level -

GREATER THAN (SLO 1)

d. RNS flow - RESTORED d. Go to Step 25.
e. CMTs - ISOLATED e. Return to Step 22.

( f. PRHR - ISOLATED f. Close PRHR isolation valves.

g. Establish desired RCS cooldown rate
h. Go to appropriate plant procedure 25 Establish RCS Heat Sink Using SGs:
a. SGs - ANY AVAILABLE a. Perform the following:
1) Try to restore SGs to service.
2) Go to Step 26.
b. Feed SGs as necessary to establish and maintain SG level
c. Open respective SG PORVs Page 9 of 12

Number Title SDG-1 Rev./Date RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE O

RESPONSE NOT OBTAINED 26 Establish RCS Heat Sink Using PRHR:

a. PRHR - AVAILABLE a. Continue with Step 27. Try to restore PRHR. WiiB PRHR available,1115 do Steps 26b and c.
b. Align PRHR to Cool RCS e [ Include additional AP600 details in E0Ps]
c. PRHR cooling - IN SERVICE c. If RCS temperature increases to greater than (ST03) F before a heat sink is established,1118 open all ADS valves.

27 Initiate Actions To Protect Personnel Working In Containment:  :

a. Evacuate non-essential personnel in containment .

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b. Periodically monitor containment radiation conditions I 28 Initiate Actions To Establish Containment Closure:

. Equipment hatch e Personnel hatch  !

l e Containment purge and exhaust system j i

e [ Include additional AP600 details in E0Ps]

i 29 Start Available Containment Fan Coo 1ers Page 10 of 12

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Number Title Rev./Date SDG-1 RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Rev. 2  !

7/31/96  :

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 30 Return To Step 15

- END -

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Number Title SDG-1 RESPONSE TO LOSS OF RCS INVENTORY DURING SHUTDOWN Re 2 7/31/96 FOOTNOTES Refer to SD GUIDELINE FOOTNOTE DEFINITION Document for a description of all footnoted parameters used in this guideline.

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I SDG-2 RESPONSE TO LOSS OF RNS O DURING SHUTDOWN i

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Number Title Rev./Date 506-2 RESPONSE TO LOSS OF kNS DURING SHUTDOWN Rev. 2

, 7/31/96 A. PURPOSE The purpose of this guideline is to provide the actions necessary for maintaining core cooling and protecting the reactor core in the event that RNS cooling is lost.

I B. SYMPTOMS OR ENTRY CONDITIONS This guideline is entered from SDF-0.1, SHUTDOWN SAFETY Critical Safety Function Status Tree on an ORANGE condition.

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Number Title Rev /Date SDG-2 RESPONSE TO LOSS OF RNS DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE 9

RESPONSE NOT OBTAINED l

1 Check Reactor Cavity Level - Go to Step 4. OBSERVE NOTE PRIOR FLOODED TO STEP 4, 2 Try To Restore RNS Flow

a. [ Include additional AP600 details in E0Ps]
b. RNS flow - RESTORED b. Align fuel pool cooling system to cool reactor cavity.

[ Include additional AP600 details in E0Ps]

IE fuel pool cooling can H0I be aligned to cool reactor cavity, IBEH perfortn the following: g

1) Establish containment integrity.
2) Establish a long term makeup source of water for the reactor cavity.

3 Go To Appropriate Plant Procedure '

NOTE The RCS is considered open when an opening exists that cannot be closed from the control room such as a SG manway.

4 Check RCS Status - OPEN Go to Step 14.

5 Check RCS Hot Leg Level - GREATER Go to SDG-1, RESPONSE TO LOSS OF THAN (SLO 2) RCS INVENTORY DURING SHUTDOWN, STEP 1.

6 Verify Stage 1, 2 and 3 ADS Manually open valves as 4

Valves - OPEN necessary.

Page 2 of 8

Number Title Rev./Date SDG-2 RESPONSE TO LOSS OF RNS DURING SHUTDOWN Rev. 2 l

p 7/31/96 l\

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l

CAUTION

  • Personnel working in containment should be warned before refilling the RCS to avoid inadvertent contamination of personnel working near RCS l

openings.

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  • Only borated water should be added to the RCS to \

maintain adequate shutdown margin.

7 Maintain RCS Hot Leg Level -

GREATER THAN (SLO 2)

, a. Maintain RCS hot leg level a. IE CVS makeup can HDI be using CVS makeup pumps as used, IHEN maintain RCS hot necessary leg level using any of the following: ,

1 e [ Include additional AP600 details in E0Ps] e CMTs.

-0R-

/~ 1 1

l e Gravity feed using the l IRWST to RNS suction i line.

-0R-e Gravity feed using the IRWST injection line.

8 Identify And Isolate Any RCS

Leakage l

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Numb 0r Title SDG-2 Rev./Date RESPONSE TO LOSS OF RNS DURING SHUTDOWN Rev. 2  !

7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l 1

l CAUTION Starting an RNS pump may result in an RCS Ievel i decrease due to shrink or void collapse.

9 Try To Restore RNS Flow:

a. Start one RNS pump e [ Include additional AP600 details in E0Ps]
b. Maintain RCS hot leg level -

GREATER THAN (SLO 2)

c. RNS flow - RESTORED c. Go to Step 10.
d. Establish desired RCS cooldown rate
e. Go to appropriate plant procedure 10 Initiate Actions To Protect Personnel Working In Containinent:
a. Evacuate non-essential personnel in containment
b. Periodically monitor containment radiation conditions 11 Initiate Actions To Establish Containment Closure:

. Equipment hatch e Personnel hatch e Containment purge and exhaust system

[IncludeadditionalAP600 details in E0Ps]

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l Number Title Rev./Date SDG-2 RESPONSE TO LOSS OF RNS DURING SHUTDOWN Rev. 2 7/31/96 O STEP ACTION / EXPECTED RESPONSE 1

RESPONSE NOT OBTAINED 12 Start Available Containment Fan l Coolers I

l 13 Return To Step 4 14 Check PRZR Level - GREATER THAN Go to SDG-1, RESPONSE TO LOSS OF (SLO 1) RCS INVENTORY DURING SHUTDOWN, STEP 1.

CAUTION

  • Personnel working in containment should be warned before refilling the RCS to avoid inadvertent contamination of personnel working near RCS openings.

, 15 Maintain PRZR Level Greater Than

\

(SLO 1) Using CVS Makeup Pumps As Necessary CAUTION Starting an RNS pump may result in an RCS level decrease due to shrink or void collapse.

16 Try To Restore RNS Flow: .

a. Start one RNS pump

. [ Include additional AP600 i l details in E0Ps] '

i b. Maintain PRZR level -

l 1

GREATER THAN (SLO 1)

c. RNS flow - RESTORED c. Go to Step 17.

1

d. Establish desired RCS cooldown rate
e. Go to appropriate plant procedure O

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Number Title Rev./Date SDG-2 RESPONSE TO LOSS OF RNS DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE O

RESPONSE NOT OBTAINED 17 Establish RCS Heat Sink Using SGs:

a. SGs - ANY AVAILABLE a. Perform the following:
1) Try to restore SGs to service.
2) Go to Step 18.
b. Feed SGs as necessary to establish and maintain SG level
c. Open respective SG PORVs 18 Establish RCS Heat Sink Using PRHR:
a. PRHR - AVAILABLE a. Continue with Step 17. Try to restore PRHR. litiB PRHR available, Ilia do Steps h

18b, c and d.

b. Align PRHR to Cool RCS

. [ Include additional AP600 details in E0Ps]

c. PRHR cooling - IN SERVICE c. Perform the following:
1) Jf RCS temperature increases to greater than (ST03) F before a heat sink is established, IliB open all ADS valves.
2) Go to Step 19.
d. Check PRZR level - GREATER d. Continue with Step 19.1f118 THAN - (SLO 1) PRZR level greater than (SLOI), Ilia do Step 18e.
e. Close all ADS valves O

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Number Title Rev./Date SDG-2 RESPONSE TO LOSS OF RNS DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1

19 Initiate Actions To Protect Personnel Working In Containment:

a. Evacuate non-essential  !

personnel in containment I

b. Periodically monitor containment radiation  !

conditions i

20 Initiate Actions To Establish >

Containment Closure: '

. Equipment hatch l e Personnel hatch e Containment purge and exhaust system U e [ Include additional AP600 details in E0Ps]

21 Start Available Containment Fan Coolers 22 Return To Step 14 I

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l Number Title Rev./Date SDG-2 RESPONSE TO LOSS OF RNS DURING SHUTDOWN Rev. 2 I 7/31/96 1

FOOTNOTES Refer to SD GUIDELINE FOOTNOTE DEFINITION Document for a description of all footnoted parameters used in this guideline.  ;

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s ,,____,m _n,4 4-- a , , &MLA s---- -4& ' ~- " * ^ ' ' '

' " " " ~ " " " ~

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SDG-3 RESPONSE TO HIGH CONTAINMENT RADIATION DURING SHUTDOWN O

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. . . ~ . . - . . . -..-- _ _ _- . - . - _ . ..

Number Title Rev./Date SDG-3 RESPONSE TO HIGH CONTAINMENT RADIATION DURING SHUTDOWN Rev. 2 7/31/96 A. PURPOSE The purpose of this guideline is to provide actions for responding to high radiation in containment.

B. SYMPTOMS OR ENTRY CONDITIONS This guideline is entered from SDF-0.1, SHUTDOWN SAFETY Critical. Safety Function Status Tree on an ORANGE condition.

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Number Title SDG-3 Rev./Date RESPONSE TO HIGH CONTAINMENT RADIATION DURING SHUTDOWN Rev. 2 7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1

1 Verify Containment Ventilation Manually close dampers.

Isolation i

2 Initiate Actions To Establish I Containment Closure:

. Equipment hatch e Personnel hatch e

Instrument Air to containment

  • [IncludeadditionalAP600 details in E0Ps]

3 Start Available Containment Fan Coolers 4 Determine If Any Additional O Actions Are Necessary 5 Go To Appropriate Plant Procedure l

- END -

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Number T1 tie Rev./Date SDG-3 RESPONSE TO HIGH CONTAINMENT RADIATION DURING SHIITDOWN Rev. 2 7/31/96 FOOTNOTES NONE USED IN THIS GUIDELINE O

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_ _ _ y _ w - ,_ - --

0 1

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SDG-4 l

RESPONSE TO INCREASING NUCLEAR FLUX DURING SHUTDOWN O

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Number Title Rev./Date SDG-4  ;

RESPONSE TO INCREASING NUCLEAR FLUX DURING SHUTDOWN Rev. 2 l 7/31/96 l

A. PURPOSE This guideline provides actions to respond to increasing nuclear flux during shutdown.

B. SYMPT 0MS OR ENTRY CONDITIONS l

This guideline is entered from SDF-0.1, SHUTDOWN SAFETY Critical Safety Function I Status Tree on an ORANGE condition.

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NumbIr Title Rev./Date I SDG-4 RESPONSE TO INCREASING NUCLEAR FLUX DURING SHUTDOWN Rev. 2 l 7/31/96 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1 Verify CVS DW Isolation Valves - Manually close CVS DW isolation CLOSED valves as necessary.

2 Verify Three Way Blend Valve - Manually align three way blend ALIGNED TO BORIC ACID TANK valve to boric acid tank.

3 Check Reactor Cavity Level - Go to Step 5.

FLOODED NOTE Fuel movement adjacent to a source range detector will cause indicated nuclear flux to change rapidly to a new subcritical multiplication level.

4 Stop Fuel Movement If Flux Change Is Unexpected 5 Check Nuclear Flux - STABLE OR DECREASING Initiate boration of RCS:

e [ Include additional AP600 details in E0Ps]

6 Check RCS Shutdown Margin - Borate RCS to reestablish GREATER THAN TECH SPEC shutdown margin:

REQUIREMENT e [ Include additional AP600 details in E0Ps]

7 Verify All Dilution Paths -

ISOLATED Manually isolate dilution paths.

[ Include additional AP60C details in E0Ps]

8 Determine If Any Additional Actions Are Necessary 9 Go To Appropriate Plant Procedure

- END -

Page 2 of 3

l Number Title Rev./Date l 50G-4 RESPONSE TO INCREASING NUCLEAR FLUX DURING SHUTDOWN Rev. 2 l 7/31/96 l

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FOOTNOTES NONE USED IN THIS GUIDELINE l l

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SDG-5 4

i RESPONSE TO RCS COLD OVERPRESSURE DURING SHUTDOWN  :

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Number Title Rev./Date  !

SDG-5 RESPONSE TO RCS COLD OVERPRESSURE DURING SHUTDOWN Rev. 2 +

O 7/31/96 l A. PURPOSE i

This guideline provides actions to respond to an overpressure condition at low f temperature.

B. SYMPT 0MS OR ENTRY CONDITIONS This guideline is entered from SDF-0.1, SHUTDOWN SAFETY Critical Safety Function Status Tree on an ORANGE condition. ,

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I Number Title Rev./Date  !

SDG-5 RESPONSE TO RCS COLD OVERPRESSURE DURING SHUTDOWN Rev. 2 l 7/31/96 g, w l STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l

1 Decrease RCS Pressure To Within Tech Spec Pressure-Temperature Limits:

a. RCS - WATER SOLID a. Perf'orm the following:
1) Use auxiliary spray. JE auxiliary spray E I availabla, Elli Use one set of first stage PRZR ADS valves.
2) Go to Step 2.
b. Decrease pressure as follows:

. Increase letdown flow

. Decrease RCS makeup flow 2 Check If All RCPs Should Be Stopped:

a. RCP - HAS JUST BEEN STARTED a. Go to Step 3.

WITH SOLID RCS CONDITIONS .

b. Stop all RCPs 3 Determine Cause Of RCS Pressurization 4 Determine If Additional Corrective Actions Are Necessary 5 Go To Appropriate Plant Procedure

- END -

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1 Number Title l SDG-5 RESPONSE TO RCS COLD OVERPRESSURE DURING SHUTDOWN Re . 2 l

7/31/96 FOOTNOTES NONE USED IN THIS GUIDELINE i I

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l RESPONSE TO UNEXPECTED RCS

! TEMPERATURE CHANGES DURING lO SHUTDOWN i

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} Number Title Rev./Date

SDG-6 RESPONSE TO UNEXPECTED RCS TEMPERATURE CHANGES DURING Rev. 2 i SHUTDOWN 7/31/96 A. PURPOSE
This guideline provides actions to respond to unexpected changes in RCS
temperature.

B. SYMPTOMS OR ENTRY CONDITIONS

{ This guideline is entered from SDF-0.1, SHUTDOWN SAFETY Critical Safety Function a

Status Tree on an ORANGE condition.

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1 l Number 11tle Rev./Date l SDG-6 RESPONSE TO UNEXPECTED RCS TEMPERATURE CHANGES DURING Rev. 2  !

SHUTDOWN 7/31/96 l

STEP ACTION / EXPECTED RESPONSE 9

RESPONSE NOT OBTAINED 1 Try To Stabilize RCS Temperature By Controlling RNS Flow As  :

l Necessary l

NOTE Flooding of the reactor cavity for refueling will result in RCS temperature decreasing to IRWST temperature. j 2 Determine Cause Of Unexpected RCS Temperature Change .

a. Evaluate operation of the following systems:

. RNS

. CCS l

. SWS I

b. Adjust system operation as necessary 3 Check RCS Temperature - STABLE Perform the following:
1. Continue efforts to regain temperature control.
2. IE RCS temperature increasing AND temperature control can EI be restored before RCS temperature exceeds 200 F, IHEN go to SDG-2, RESPONSE TO LOSS OF RNS DURING SHUTDOWN.

4 Go To Appropriate Plant Procedure

- END -

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Number Title Rev./Date SDG-6 RESPONSE TO UNEXPECTED RCS TEMPERATURE CHANGES DURING Rev. 2 SHUTDOWN 7/31/96 FOOTNOTES NONE USED IN THIS GUIDELINE O

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&-+ ma e- --=w- =- a -m0 ,A --- --J--

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SHUTDOWN GUIDELINE O FOOTNOTE DEFINITION DOCUMENT l

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Number Title Rev./Date SDF00TNOTE SHUTDOWN GUIDELINE FOOTNOTE DEFINITION DOCUMENT Rev. 2 7/31/96 i j

A. PURPOSE This document contains the definitions for all the footnotes used within the AP600 Shutdown Emergency Response Guidelines.

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NumbIr Title Rev./Date SDF00TNOTE SHUTDOWN GUIDELINE FOOTNOTE DEFINITION DOCUMENT Rev. 2  !

7/31/96 '

STEP ACTION / EXPECTED RESPONSE MASTER FOOTNOTE INDEX SLOl PRZR level CMT actuation setpoint during shutdown SLO 2 RCS hot leg low level IRWST actuation setpoint SLO 3 CMTlowlevel ADS actuation SLO 4 RCS hot leg level greater than bottom of hot legs SLOS CMT fourth stage ADS actuation setpoint SLO 6 IRWST level for transfering RNS to contaiment sump SR01 Containment radiation setpoint to isolate containment purge and exhaust system ST01 Time delay for second stage ADS actuation ST02 Time delay for third stage ADS actuation ST03 Normal RNS cut-in temperature

- END -

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