ML20204J092

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Rev 6 to Emergency Operating Procedure EOP 3.1-34, Complete Loss of Control Air Supply
ML20204J092
Person / Time
Site: Millstone, Haddam Neck, 05000000
Issue date: 04/05/1988
From:
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20204H467 List: ... further results
References
EOP-3.1-34, NUDOCS 8810240535
Download: ML20204J092 (8)
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PRO EDUR COVER SHEET APR 5 1958 PROCEDURE NUMBER TITLE REV.NO.

EOP 3.1-34 Complete Loss of Control Air Supply 6

ORGiNATOR B. Gracie DATE DEPT.

2/10/88 Ops I

TECHNIC AL REVIEW l

f

( OPERATIONS u.Iv HEALTH PHYSICS i

ENGINEERING CHEMISTRY REACTOR ENGR.

SECURITY MAINTENANCE STORES O INST. & CONTROL CR

[ ADMIN.

RECORDS

[

]

[

]

i Ot 1

Ot 1

l DEPARTMENT HEAD REVIEW COMPLETE / BIENNtAL REVIEW 7 YES NO PORC REVIEW REQUIRED?

hYES]NO YEShNO ENVIRONFENTAL IMPACT 7 YEShNO MAJOR REVISION?

YEShNO WRITTEN SAFETY EVALUATON ATTACHED 7 YES[ N/A A CHANGE TO INTENT?

YEShNO UNREVIEVED SAFETY OVESTod?

YEShNO SAFETY EVALUATON REQUIRED?

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APPROVAL

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'23Y)".hsA IURC'M EiTING NO.

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KEN DATE PROCEIXJRE EqCilVE DATE REQUIRE.S UCENSED OPER ATOR REN1EW7 YES3NO 1

9.87 ACP 1.2 6.5. Attachment 8.1

!!A "A888R 825 % a p

PDR

EOP 3.134 i

Rev. 6 APR 51988 I

Connecticut Yankee Emergency Operating Prxedure No. EOP 3.1-34 Operations COMPLETE LOSS OF CONTROL AIR SUPPLY 1.0 DISCUSSION 1.1 Control air is distributed throughout the plant by means of parallel headers, each originating at a separate receiver and containing filtration and drying apparatus. Each header, and associated conponents, is sized to meet normal plant requinments for instrument and control air. Failure of the operating compressor or a system leak will result in an automatic start of the standby compressors due to low system pressure. "C" air compressor is installed so that it will supply the control room and PAB. Additional capa, city can be made available by valving in the inter connection from the service air system.

2.0 SYMPTOMS 2.1 Low control air pressure indication and alarm at 80 psig.

2.2 Low MCB control air pressure alarm at 18 psig.

2.3 Control air compressor trouble alarm.

2.4 Steam generator low level alarms.

2.5 Reactor and turbine trip alarms.

2.6 Erratic and/or erroneous indications on pneumatic level indicators.

2.7 HJgh pressurizer level alarm.

2.8 Low RCP seal water retum flow alarm.

2.9 Low total component cooling flow indication.

2.10 VCr level and pressure indicating zero.

2. I 1 1.ow level alarms on all feedwater heaters.

2.12 Low level alarms on drain receivers.

Page 1 of 7

EOP 3.134 Rev 6 3.0 AUTOMAVC ACTIONS APR 5 1986 I

3.1 Reactor and turbine trip.

3.2 Feedwater regulating valves close and bypass valves open.

3.3 Letdown valves close.

3.4 Charging flow control valves fail open.

3.5 Seal water retum trip valve closes.

3.6 Seal water supply HICV fails open.

3.7 Secondary safety valve actuation.

3.8 Containment isolation valves close.

3.9 Feedwater heater normal and high level control valves fall open.

3.10 IIcater drain pumps trip.

3.11 Both auxiliary steam generator feedwater pumps start.

3.12 Loss of steam dump control.

4.0 IMMEDIATEACTIONS 4.1 Trip all RCPs.

4.2 Perform immediate actions in E 0, REACTOR TRIP OR S AFETY INJECTION, 5.0 SUBSEQUENT ACTIONS 5H,E ACnON/ EXPECTED RESPONSE RESPONSE NOT OBTAINED 5.1 Place standby charging pump in TPO 5.2 Control charging flow by throttling

' Throttle charging line manual valves CH MOV 2928 and CH MOV 292C CH.V 286 AND CH.V 286B 5.3 Control AUX feedwater flow with feed bypass manualisolation valves at greater than 320 GPM until atleast one SO wide range levelis gester than 63 %

5.4 Start the service air compressor:

a. Check control air pressure greater
a. Attempt tolocate and isolate leak than 30 psit and go to step 5.5.

Page 2 of 7

EOP 3.134 RGv 6 APR 5 1986 IIEE ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED

(

5.4

b. Open service air to control air cross connect valves (SA V-407 and CA-V 121)
c. Verify control air pressure
c. Go to step 5.5.

increases to approximately 90 psig

d. Rerum to procedure and step in effect 5.5 Isolate hotwell makeup valve
a. Maintain hotwelllevel with makeu 3 and dump MOVs (CD&OV 10 and CD MOV 17),

Observe levellocally 5.6 Open bypass valves around the NRVs:

a. Manually control gland steam pressure
b. ControlTave by:
1. Manually controlling steam to terry turbines
2. Throttling open hog jet steam supply valves 5.7 Check MSIV accumulator pressure Within one hour connect nitrogen l

greater than 86 psig backup to pressurizer accumulator greater than 86 psig.

5.8 Verify PAB control air pressure Oo to step 5.9 normal

a. Attempt to testore control air to turbine building and realign affected valves
b. Rerum to procedure and step in effect 5.9 Shift charging pump suction to RWST
a. Open BA MOV 373
a. Open CH MOV 32
b. Close CH.MOV 257
b. Locally close CH.MOV.257 Page 3 of 7

EOP 3.1-34

  • " hPR S 1985 4

SIIg ACTIONEYPECTED RESPONSE RESPONSE NOT OBTANED 5.10 Line up drain header to PDT

a. Open DH.V-408
a. Open DH V 407
b. Cose CH V 383 5.11 Cose the following valves:
a. CH MOV 292B and
a. Cose ch: fng line manual valves CH.MOV 292C CH V 2F and CH Y 286B
b. LD-MOV 200
b. Cose LD-\\ 221
c. Sea 1 water retum MOVs (CH MOV 311,312,313,314)
d. RCP thermal barrier retum manualisolation CC V 841
e. RCP oil cooler rerum manual isoladon CC V 901
f. Drain cooler CCW retum CC V 738
g. Feedline MOVs (FW MOV 11,
g. Cose feedline manualisolation 12,13, and 14) valves.

5.12 Line up emergency nitrogen supply to RCP thermal banier mp valves:

a. Cose CA V 972 (control air to thermal banier trip valves)
b. Open CA V 971 (nitrogen supply to thermal barrier trip valves)
c. Slowly thrtxtle oxn CC V 841 to establish CCW f ow to RCP thermal barriers Page 4 of 7

EOP 3.1 34 Rev.6 APR 5 1988

$31E ACnONEXPECITD RESPONSE RESPONSE NOT OBTAINED 5.13 Check runninJ or start a service air compressor, t wn ogn the cross connect valves to control air (SA V-407 and CA V 121)

a. Check control air pressure
a. Perform the following:

approximately 90 psig

1. Close service air to control air cross connect valves.
2. Installjumperin blowdown I

room from service alt (SA V 414) to control air.

3. Determine reason for low control air pressure and isolate any leaks.
4. Go to step 5.14

[

5.14 The following valves will

[

reopen:

i

s. RCP bearing water retum trip valve CC TV 1411
b. Drain header trip valves i

DH TV 1847 and DH TV 1841

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l

c. Valve stem leak off trip valve L

DH W 1842A

d. Va w seal heti tank trip valve i

DE TV 1843

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e. Seal water return trip valve CH TV 334
f. Drain cooler CCW return trip l

valve CC FCV 611 i

i 5.15 Slowly establish cooling water to:

l

a. RCPoilcoolers

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b. Draincooler I

L 3

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r Page 5 of 7 I

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EOP 3.134 Rev.o M ACTIONEXPECH!D RESPONSE RESPONSE NOT OBTAINEQ t

5,16 Perform the following:

a. Place letdown systemin service
b. Lineup drain header to VCT
c. Shift chargiae pump suction to the VCT 5.17 Check open service air to coctrol sir cross connect valves
a. Check control air pressure
a. Perform the following:

approximAtely 90psig

1. Shut service air to control air cross connect valves.
2. Do not proceed to Step'5.18 until conwl air system -

4 pressurized.

5.18 Return auxiliary feedwater system to normallineup I

5.19 Open condenser makeup valve manual

{

isolation valve l

5.20 Isolate nitrogen to MSIV accumulator and align control air to the secumulator 5.21 Open CA V 972, then close CA V 971 to align control air to the RCP thermal barrier trip valves 5.22 When control air system is returned to normal pressure, then retura to procedure and step in effect f

END l

6.0 FOOTNOTES None i

Page 6 of 7 i

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EOP 3.134 Rev.6 7.0

SUMMARY

OF CHANGES Step #

Changes Reasons 2.3 Change "hi temp" to "trouble" Added new local alarm panel.

4.1/ 4.2 Made 4.1 into two separate steps Make each step only one action.

5.2 Changed step arrangement Give guidance on controling chargmg flow.

5.4 a.

Add "Attempt to locate and isolate leak" Give additional guidance to find leak.

5.4 b.

Add valve names Better description.

5.6 b.

Rearrange step Give additional guidance to control steam flow for Tave control.

5.8 Move RNO Trom 5.7 to 5.8 Relocate to properlocatio; 5.11 Add valve numbers Better description.

5.12 i New step PDCR 878 add emergency nitrogen supply to thennal barner trip valves.

5.13 Change guidance in RNO column Give additional uidance toinstall F

service air to control airjumper, 5.14 a.

Delene PDCR 878 add emergency nitrogen supply to thermal bamer trip valves.

5.15 a.

Delete PDCR 878 add emergency nitrogen i

supply to thermal barrier trip valves.

5.17 New step Insure control air system is pressurized before going on.

5.21 New step Retum thermal barrier trip valves to i

normal control air supply, i

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Page 7 of 7 L

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