Text

Proposed Tech Specs Providing LCO 3.0.4 Exception for Modes 5,6 or Defueled Configuration
	ML20072M360
Person / Time
Site:	San Onofre
Issue date:	08/26/1994
From:	; SOUTHERN CALIFORNIA EDISON CO.
To:	;
Shared Package
ML20072M352	List: ML20072M348; ML20072M354; ML20072M356; ML20072M360;
References
	NUDOCS 9409010287
	Download: ML20072M360 (51)
	v • d • e

..

EXISTING TECHNICAL SPECIFICATIONS ATTACHMENT A i

l UNIT 2 TS I

1 i

l 1

f 9409010287 940826 PDR ADOCK 05000361 P

PDR w-N

-ww-

,v;- Sv57Eus 3,: ,.3 C '.T; L R::M E"!;0Ee a R c'.!WJP $3 sigea I

t..!T!* ",, CC'QITION FOR OPERATION 3.7.5 Two inde;endent control rocm e ergency air cleanup systems shall te 07 ERA 3kE-a::LIC t.!!LITY:

ALL MCOES ACTION:

Unit 2 or 3 in M00E 1, 2, 3 or 4:

With one control room emergency air cleanup system inoperable, restore the ine;erable system to CPERABLE status within 7 days or be in at least HOT STA!;*SY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTOOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

Units 2 and 3 in MODE 5 or 6:

With one control room emergency air cleanup system inoperable, a.

restore the inoperable system to OPERABLE status within 7 cays or initiate and maintain operatien of the remaining OPERABl.E contro*

rocm emergency air cleanup system in the recirculation mode.

b.

With both control room emergency air. cleanup systems inoperable, or with the OPERABLE control reem emergency air cleanup system re::uire:

to be in the recirculation mode by ACTION (a), not capable of be' ;

powe ed by an OPERABLE emergency power source, suspend all c;erati: s involving CORE ALTERATIONS or positive reactivity changes.

The provisions of Specification 3.0.3 are not applicable in MO:E 5.

c.

SURVEILLANCE REQUIREMENTS 4.7.5 Each control room emergency air cleanup system 1 hall be demonstra:ec OPERABLE:

At least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying that the control room air a.

te parature is less than or equal to 110'F.

b.

At least once per 31 days on a STAGGERED TEST BASIS by initating, from the control room, flow through the HEPA filters and charcoal adsaf$ers and verifying that the system operates for at least 10 hours1.157407e-4 days 0.00278 hours 1.653439e-5 weeks 3.805e-6 months with the heaters on.

At $esst once per 18 months or (1) after any structural maintenarce c.

on the HEPA filter or charcoal adsorber housings, or (2) following painting, fire or chemical release in any ventilation zone communicating with the system by:

1.

Verifying that with the system operating at a flew rate of 35415 cfm + 10% for the air conditioning unit,.and 2050 = 150 for the ventilatien unit and recirculating threagh tne respec HEPA filters and charcoal adsorbers, leakage through the sys W diverting valves is less than or equal to 1% air conditioning unit and 1% ventilation unit when the system is tested by admitting cold DOP at the respective intake.

MAY.161993 "S r.a re:: system with San Onofre - Unit 3.

SAN O*.0FRE ';N:T2 3/4 7-13 AMENOME!iT 10.'I

i punt SYSTEMS t

i i

_sg::vEnu.'CE REQUIREMENTS (Continueo i

2.

Verifying that the cleanup system satisfies the in place testing acceptance criteria and uses the test procedures of Regulatory Positions C.S.a. C.S.c and C.S.d of Regulatory Guide 1.52, Revision 2 March 1978, and the system flow rate is 2050 1 150 cfm for the ventilation unit and 35,485 cfm 1 1C%

l for the air conditioning unit.

3.

Verifying within 31 days af ter removal that a laboratory analysis of a representative carbon sample obtained in accordance with Regulatory Position C.6.b of Regulatory Guide 1.52, Revision 2, March 1978, meets the laboratory testing criteria of Regulatory Position C.6.a of Regulatory Guide 1.52, Revision 2, March 1978.

Verifying a system flow rate of 2050 1 150 cfm for the l

4 ventilation unit and 35,485 cfm i 10% for the air conditioning unit during system operation when tested in accordance witn ANSI N510-1975.

After every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of charcoal adsorber operation by verifying d.

within 31 days after removal that a laboratory analysis of a representative carbon sart.;:le obtained in a:cordance with Regulatory Position C.6.6 of Regulatory Guide 1.52, Revision 2, March 1975, meets the laboratory testing criteria of Regulatory Position C.6.a of Regulatory Guide 1.52 Revision 2, March 1978.

At least once per 18 months by:

e.

1.

Verifying that the pressure drep across the combined HEPA filters and charcoal adsorber banks is less than 7.0 inches l,

Water Gauge ventilation unit and less than 7.3 inches Water Gauge air conditioning unit while operating the system at a g

flow rate of 2050 2 150 cfm for the ventilation unit and e

35,485 cfm t 10% for the air conditioning unit.

M Verifying that on a control room isolation ?.est signal, the system automatically switches into the eme.cgency mode of operation with flow through the HEPA filters and charcoal adsorber banks.

Verifying that on a toxic gas isolation test signal, the syste-3.

automatically switches into the isolation mode of operation with flow through the HEPA filters and charcoal adsorber banks.

/

Verifying that the system maintains the control room at a 4.

positive pressure of greater than or equal to 1/8 inch W.G.

relative to the outside atmosphere during system operation in the emergency mode.

Verifying that the heaters dissipate 4.8 kw t 5% when tested 5.

in accordance with ANSI N510-1975.

9.,

s.

AMENOMENT NO. 14 SAN ONOFRE-UNIT 2 3/4 7-14 l

ptANT SYSTEMS

p y y :. =. T i ~ ':.~ " i :

r,,..:.u, p Af ter each ccmplete or partial replacement of a HEPA filter bank by f.

verifying that the HEPA filter banks remove greater than or equal to 99.95% of the 00P when they are tested in place in accordance with ANSI H510-1975 while operating the system at a flow rate of 2050 150 cfm for the ventilation unit and 35,485 cfm : IC% for the l

air conditioning unit.

Af ter each complete or partial replacement of a charcoal adsorber g.

bank by verifying that the charcoal adsorbers remove greater than or equal to 99.95% of a halogenated hydrocarbon refrigerant test gas when they are tested in place in accordance with ANSI N510-1975 while operating the system at a flow rate of 2050

150 cfm for the l

ventilation unit and 35,485 cfm 210% for the air conditioning unit.

.i FEBi810R1 SAN ONOFRE-UNIT 2 3/4 7-15 AMEN 0HENT NO. I'

1.--

m 9

e EXISTING TECHNICAL SPECIFICATIONS ATTACHMENT B

UNIT 3 TS f

w e-p-M

l*

pt ANT SYSTEFS I

CONTROL RocM EMERGENCY AIR Ct.!ANUP SYSTEH"

,][

3 /.t. 7. 5 j

ggITING MITION FOR OP! RATION i

Two independent control room emergency air cleanup systems shall be 3.7.5 OPERA 8LE.

APPt.ICA31LITY_: ALL M00E5 g:

Unit'2 or 3 in MODES 1. 2, 3 or 4:

With one control room emergency air cleanup systas inoperable, restore the inoperable system to CPERA8LE status within 7 day i

{

30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

[

Units 2 and 3 in HOOFS 5 or 6:

With one contrer room emergency air cleanopr system inoperable, restore the inoperable system to OPERA 8LE status within 7 days or a.

initiate and maintain operation of the remaining QPERABLE control J

room emergency air cleanup system in the recirculation mode.

With both control room energency air cleanup systems inoperable, or with the OPERA 8LE control room emergency air cleanup system required b.

to be in the recirculation mode by ACTION (a), not capable of being powered by an CPERASLE emergency power source, suspend all f

involving CORE ALTERATIONS or positive reactivity changes.

d, The provisions of Specification 3.0.3 are not applicable in MCOE 6.

c.

t

$URVEILLANCE REQUIREMENTS

}

Each control roca emergency air cleanup systes shall be demonstrated 4.7.5 OPERA 8LE: At least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying that the control room air j

j temperature is less than or equal to 110*F.

a.

At least once per 31 days on a STAGGERO TEST 8 ASIS by initating, free the control rosa, flow through tha NEPA filters and charcoal b.

adsettlers and verifying that the-system operstas for at least 10 hours1.157407e-4 days 0.00278 hours 1.653439e-5 weeks 3.805e-6 months with the heaters on.

c.. 'At, least once per 18 months or (1) after any structural saintenance en the HEPA filter or charcoal adsorber housings, or (2) following-painting, fire or cheatcal release in any ventilation zone communicating with the system by:

Verifying that with the syntaa operating at a flow rate of 35445. cfm f,105 for the air conditioning unit, and 2050 t 150 1.

for the ventilation unit and recirculating through the respective HEPA filtars and charcoal adsorbers, leakage through the system diverting valves is less than or equal to 15 air conditioning unit and 3X ventilation unit when the system is tested by 4

admitting cold 00P at the respective intake.

f f

(

Shared system with San Onofre - Unit 2.

R N D OMDC NO. 3 3/4 7-14 SAN ONOFRE-UNIT 3

l i-l

(

PLANTSY53y5 sMVEIuaA'ct At001REMENTS (Continued 1

)

Verifying that the cleanup system satisfies the 2.

Regulatory Positions C.5.a. C.5.c and C.5.d of Regulatory O

Guide 1.52 Revision 2, March 1978, and the system flow rate is.'

\\

t cfm for the ventilation unit and 35,485 cfm e 10%

I 2050 2 150 I

for the air conditioning unit.

f Verifying within 31 days after removal that a laboratory analysis of a representative carton sample ibt 3.

Guide 1.52, Revision 2, March 1978, meets th i

Guide 1.52, Revision 2, March 1978-

}

(

2050

150 cfm for the Verifying a system flow rate of ventilation unit and 35,485 cfa 2 105 for the air conditioning

[

4.

unit during system operation when tested in accordance with f]

ANSI N510-1975.

After every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of charcoal adsorber operation by verifyi g

within 31 days after removal that a laboratory analysis of a

[

d.

representative carton sample obtained in accordance with Re Position C.6.h of Regulatory Guide 1.52 Re 5

6 of Regulatory Guide 1.52, Revision 2, March 1978.

8 f

At least once pir 18 months by:

e.

Verifying that the pressure drop across the combined HEPA filters and charcoal adsorber banks is less than 7.0 1.

Water Gauge vent 11stien unit and less than 7.3 inches Water Gauge air conditioning unit while operating'the system at a flow rate of 2050 s 150 cfm for the ventilation unit 35,445 cfm 2105 for the air conditioning unit.

Verifying that en a control rose isolation test signal, the system automatically switches into the 2.

j adsorter banks.

f Verifying that on a toxic gas isolation test signal, the sys i

automatically switches into the isolation mode of operatio j

1 with flow through the NEPA filters and charcoal adsorbe Verifying that the system maintains the control reos at a positive pressure of greater than er equal to 1/8 inch 4.

i in relative to the outside atmosphere during system operat on the emergency mode.

Verifying that the heaters dissipate 4.8 kw * $5 whe 5.

accordance with ANSI N510-1975.

ftB i 8190 AMENDMENT NO. 3 3/4 7-15 SAN ONOFRE-UNIT.3

pte:* Sv5'!"5 SugygILLANCE A!001 AEMENT5 (Continued, p-._

After each complete or partial replacement of a HEPA filter bank by 2

f.

verifying that the HEPA filter banks remove greater than or equal to 99.95% of the 00P when they are tested in place in accordance with

[

while operating the system at a flow rate of AN5I N510-1975 2050 2 150 cfm for the ventilation unit and 35,485 cfm 210% for the

{i air conditioning unit.

After each conclete or' partial replacement of a charcoal edsorber t

i bank by verifying that the charcoal adsorbers remove greater than or g.

. I equal to 99.95% of a halogensted hydrocarbon refrigerant test gas when they are tested in-place in accordance with ANSI N510-1975 lll

- L' while operating the system at a flow rate of 2050 2 150 cfm for the ventilation unit and 35,485 cfm 2 10% for the air conditioning unit.

i i

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j i

i L

a 1

l FE) 1 R FF'

.J AMD O O T N0. 3 3/4 7-16 5AN ONOFRE-UNIT 3 j

i I

PROPOSED TECHNICAL SPECIFICATIONS 1

l i

ATTACHMENT C

l l

UNIT 2 TS 1

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.o 1

g svs I"s y,4,7,!

CC'.?R '. R:04 EIRGio A

a c'.!:nJP $3 sige.

,qins CC'CITICN FOR OPERATICN Two inde;endent control reem e ergency air cleanup systems shall te 3.7.5 C7 IRA 3LE-AdemexV f hLetsdt'4/gg[uthaMcM MU S

1::LIC.!!LITY:

ALL M*0E or del ACTICN' Unit 2 or 3 in PODE 1, 2, 3 or 4:

with one control room emergency air cleanup system inoperable, restore the ino;erable system to OPERABLE status within 7 days or be in at least HOT STA:CBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTD0'a*N within the following j

Ui nc 3 in M00E 5 or 6 With one control roem emergency air cleanup system inoperable, a.

restore the inoperable system to OPERABLE status witnin 7 days or initiate and maintain operatien of the remaining OPERABLE cor. trol roem emergency air cleanup system in the recirculation mode.

I With both control room emergency air. cleanup systems inoperable, or b.

with the OPERABLE control roem emergency air cleanup system re::ui ed to be in the recirculation mode by ACTION (a), not capable of be# g p:ve-ed by an OPERABLE emergency power source, suspend all c;erati: r A TONS positive reactivity changes)3FE D e rm Lf foRI Agasse;mb s wa Wd li la in M"E c-1_provls tiEn en.1.0.3 are

~

a mwwy The proRs toHecJ.o.4rdre deF Mrob w

.a k?! M k W F " W SUR 4.7.5 Each control room emergency air cleanup system Thall be demenstratec OPERA 5LE:

At least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying that the control reem air a.

terparature is less than or equal to 110*F.

At least once per 31 days on a STAGGERED TEST BASIS by initating, b.

from the control room, flow through the HEPA filters and charcoal ads h ers and verifying that the system operates for at least 10 tours with the heaters on.

At keest once per 18 months or (1) af ter any structural maintanar:e c.

on the HEPA filter or charcoal adsorber housings, or (2) following painting, fire or chemical. release in any ventilation Zone communicating with the system by:

Verifying that with the system ope-ating at a flow rate of 1.

35415 cfm + 10% for the air conditioning unit, and 2050 : li; :'-

for the ventilation unit and recirculating threagh sne res;e:P HEPA filters and charcoal adsorbers, leakage through the syt W diverting valves is less than or equal to 1% sir conditioning unit and 1% ventilation unit when the system is tested by admitting cold 00P at the respective intake.

MM.161993 "Sr.arec system w uh San Onofre - Unit 3.

A'4E cy.E',T IC. ' i 5 3 0'.;*RE ';';;T 2 3/4 7-13

punt SYSTEMS

\\

n syssnUNCE REQUIREMENTS (Continue:n

)

2.

Verifying that the cleanup system satisfies the in-pla:e testing acceptance criteria and uses the test procedures of Regulatory Positions C.S.a, C.S.c and C.5.d of Regulatory i

Guide 1.52, Revision 2. March 1978, and the system flow rate is 2050 150 cfm for the ventilation unit and 35,485 cfm 10%

l for the air conditioning unit.

Verifying within 31 days after removal that a laboratory 3.

analysis of a representative carbon sample obtained in accordance with Regulatory Position C.6.b of Regulatory Guide 1.52, Revision 2, March 1978, meets the laboratory testing criteria of Regulatory Position C.6.a of Regulatory Guide 1.52, Revision 2, March 1978.

4 Verifying a system flow rate of 2050 150 cfm for the l

ventilation unit and 35,485 cfm t 10% for the air conditioning unit during system operation when tested in accordance witn ANSI N510-1975.

After every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of charcoal adsorber operation by verifying d.

within 31 days after removal that a laboratory analysis of a representative carbon sart:1e octained in a::.ordance with Regulato j

, Position C.6.b of Regulatory Guide 1.52, Revision 2, March 1975, meets the laboratory testing criteria of Regulatory Position C.S.a of Regulatory Guide 1.52, Revision 2, March 1978.

At least once per 18 months by:

a.

Verifying that the pressure drop across the combined HEPA filters and charcoal adsorber banks is less than 7.0 inches l

1.

Water Gauge ventilation unit and less than 7.3 inches Water Gauge air conditioning unit while operating the system at a l

flow rate of 2050

150 cfm for the ventilation unit and 35,485 cfm

10% for the air conditioning unit.

Verifying that on a control room isolation test signal, the Pg6 system automatically switches into the emergency mode of operation with flow through the HEPA filters and charcoal adsorber banks, Verifying that on a toxic gas isolation test signal, the syste-s 3.

automatically switches into the isolation mode of operation with flow through the HEPA filters and charcoal adsorber banks.

Verifying that the system maintains the control room at a 4.

positive pressure of greater than or equal to 1/8 inch W.G.

relative to the outside atmosphere during system operation in the emergency mode.

Verifying that the heaters dissipate 4.8 kw i 5% when testec 5.

in accordance with ANSI N510-1975.

g.,

AftEN0 MENT No. M 3/4 7-14 SAN Ot:0FRE-UNIT 2

\\

ptwT SYSTEMS E

c,-~.;~.ti~ : ;. ~ "i - - t. :.

..._,:)

After each complete or partial replacement of a HEPA filter bank by f.

verifying that the HEPA filter banks remove greater than er equal to 99.95% of the DOP when they are tested in place in accordance with ANSI H510-1975 while operating the system at a flow rate of 2050 150 cfm for the ventilation unit and 35,485 cfm : IC% for the l

air conditioning unit, After each complete or partial replacement of a charcoal adsorber g.

bank by verifying that the charcoal adsorbers remove greater than or equal to 99.95% of a halogenated hydrocarbon refrigerant test gas when they are tested in-place in accordance with ANSI N510-1975 while operating the system at a flow rate of 2050 2 150 cfm for the l

ventilation unit and 35,485 cfm 10% for the air conditioning unit.

e

' s...,'

FEBi810" AMENDMENT No. Il 3/4 7-15 SAN ONOFRE-UNIT 2

b a2 e--

m

-.-u-1 I

1 i

l PROPOSED TECHNICAL SPECIFICATIONS

'l ATTACHMENT D

UNIT 3 TS

i

'h plast SYSTEMS CONTROL ROOM EMga,gy Y AIR CLEANUP SYST!M" H[

3/4,7 $

I

PIT 1RG UnGITICM FOR OPERATION Two independent control room emergency air cleanup systems shall be 3.7.5 d5<$66ef

/

b p cA ILITY:

ALL HCDE

~

g:

unit 2 or 3 in MODES 1, 2, 3 or 4:

J With one control room emergency air cleanup system inoperable, restore the inoperable system to OPERA 8LE status within 7 days or be in at least HOT 4

STANOBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the follo

'k a % A M ' A lrf" O N S #'

y'5]

W i

30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

- m Units 2 and 3 in H00F5 5 or 6 or With one contrer room emergency air cleanup system inopenble, restore the inoperable system to OPERABLE status within 7 days or a.

initiate and saintain operation of the remaining CPERASLE control i

roce amargency air cleanup system in the recirculation mode.

With both control room emergency air cleanup systems inoperable, or with the OPERA 8LE control room amargency air cisanup systen require b.

to be in the recirculation mode by ACTION (a), not capable of being powered by an CPERABLE emergency power source, s f

{

kl f

ese 1 cable

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one fict Lion J._0.3__are no.

f{

e pro.

n ca dA a ie

' cons 7.6.tprew app /E**

E rkovdoen W

%NM"M %

l CT-iiquTRDiiWi>

suRvEI Each control room emergency air cleanup systaa shall be demonstrated

4.7.5 OPERABLE

At least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying that the control room air temperature is less than or equal to 110*F.

a.

At least once per 31 days on a STAGGERED TEST 5A$15 by initating from the control room, flow through the HEPA filtars and charcoal

~

b.

adsorbers and verifying that the systaa operatas for at least F

10 hours1.157407e-4 days 0.00278 hours 1.653439e-5 weeks 3.805e-6 months with the heatars on.

At least once per 18 months or (1) after any structural saintenance

~

en the HEFA filter or charcoal adsort>er housings, or (2) following

c..

,i painting, fire or chemical release in any ventilation zone casounicating with the systes by:

Verifying that with the system operating at a flow rate of2050 2 1.

35445 cfa 1 10% for the air conditioning unit, and HEPA filtars and charcoal adsorbers, leakage through the system diverting valves i; Ws than or equal to 1% sir conditioning unit and 3% ventilation unit when the system is testati by admitting cold 00P at the respective intake.

(

Shared system with San Onofre - Unit 2.

=

NID E U4T NO 3 3/4 7-14 SAN CHOFRE-UNIT 3

b 1

(

[

'.,, I sugyEILLAsc1. 210UIREMENT5 (Continued) n Verifying that the cleanup systes satisfies the i fc i

2 l

Regulatory Positions C.5.a. C.S.c and C.5.6 of Regulatory

\\

Guide 1.52, Revision 2, March 1974, and the system flow rate is l

y 2050 a 150 cfm for the ventilation unit and 35,485 cfm c m l

fr for the air conditioning unit.

Verifying within 31 days after removal that a laboratory analysis of a representative ci.rson sample ibtained in 3.

accordance with Regulatory Position C.8.b of Regulatory Guide 1.52, Revision 2, March 1978, meets th Guide 1.52, Revision 2, March 1974

\\

2050

150 efs for the Verifying a systas flow rate of i

i ventilation unit and 35,485 cfs a 105 for the air condition ng 4.

f unit during system operation when tested in accordance with g

i AM5! N510-1975.

After every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of charcoal adsorber operation by verif j

within 31 days after removal that a laboratory analysis of a

[

d.

representative carton sample obtained in accordance with Position C.E.b of Regulatory Guide 1.52, Revision 2, March 6

seats the laboratory testing criteria of Regulatory Position C.

o.' Regulatory Guide 1.52, Revision 2, March 1974.

f At least once per 18 months by:

Verifying that the pressure drop across the combined HEPA e.

filters and charcoal adsorber banks is less than 7 1.

Water Gauge ventilation unit and less tha flew rate of 2060 e 150 cfm for the ventilation un 35,445 cfm

105 for the air conditioning unit.

Verifying that en a control rose isolation test signal, the system automatically switches into the 2.

adsetter banks.

Verifying that en a toxic gas isolatten test signal, the sy asteestically switches into the isolatten sede of operati 1

with flow through the NEPA f t1 tars and charcoal ads Verifying that the system maintains the centrol room at a positive pressure of greater than er equal to 1/8 in 4.

in relative to the outside atmosphere during system opera the emergency mode.

Verifying that the heaters dissipate 4.8 kw t SX whe 5.

accordance with ANSI N510-1975.

FEB i 81#1 AM NDMENT MO. 3 3/4 7-15 SAN ONOFRE-UNIT.3

p,y

Sv5*E"1 SUgygILLANCE REQUIREMENTS (Continued

,N

~p After each complete or partial r. placement of a HEPA filter bank by f.

verifying that the HEPA filter banks remove greater titan or equal to 99.95% of the 00P when they are tested in place in accordance with while operating the systes at a flow rate of ANSI N510-1975 cfa for the ventilation unit and 35,445 cfa 210% for the

{

2050

150 air conditioning unit.

t After each complete or' partial replacement of a charcoal adsorber t

bank by verifying 'that the charcoal adsorbers remove greater than er g.

equal to 99.95% of a halogenated hydrocarbon refrigerant test gas when they are tested in-place in accordance with AM5! H510-1975 l

wnile operating the syates at a flow rate of 2050 2 150 cfm for the ventilation unit and 35,a85 cfm 10% for the air conditioning unit.

1 l

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6 NM3 3/4 7-16 1AN ONOFRE-UNIT 3

,,-,-n-,------,-,-

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l ENCL 0SURE 2

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i PCN-299 (TSIP)

TECHNICAL SPECIFICATION 3.7.11 and BASES (with marked-up chanaes proposed by PCN-439)

UNIT 2 l

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.i, ;

3.'

3,7 PLMT SYSTEMS Control Room Emergency Air Cleanup System (CREACUS) 3.7.11 LCO 3.7.11 Two CREACUS trains shall be OPERABLE.

MODES 1, 2, 3, 4, 5, and 6, APPLICABILITY:

During movement of irradiated fuel assemblies.

NOTES---------------------------

f. Each Unit shall enter applicable ACTIONS sepa ACTIONS 1x. seer I

~

REQUIRED ACTION COMPLETION TIME CONDITION A.

One CREACUS train A.1 Restore CREACUS train 7 days to OPERABLE status.

inoperable.

S.

Required Action and B.1 Be in M00E 3.

6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion Time of Condition A gg not met in MODE 1, 2,

3. or 4.

B.2 Be in MODE 5.

36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months C.

Required Action and C.1 Place OPERABLE Ismediately associated Coupletion CREACUS train in Time of Condition A emergency radiation not met in MODES 5 protection mode.

or 6, or during movenset of irradiated gg feel assashlies.

(continued) f

~

JC0 3.D.y are n/ gnyticoate 2.k povwns or gue/ed cogurah'e, 1

N k n en/eri s s; MENDMENT NO.

SAN ON0FRE--UNIT 2 3.7-25

ACTIONS

~

CON 0! TION REQUIRED ACTION COMPLETICH TIME C.

(continued)~

C.2.1 Suspend CORE Imediately ALTERATIONS.

!.EE C.2.2 Suspend movement of Imediately irradiated fuel assemblies.

D.

Two CREACUS trains 0.1 Enter LCO 3.0.3.

Imediately i

inoperable in MODE 1, 2, 3, or 4.

E.

Two CREACUS trains E.1 Suspend CORE Imediately inoperable in MODES 5 ALTERATIONS.

or 6, or during movement of irradiated 8,HQ fuel assemblies.

E.2 Suspend movement of Imediately irradiated fuel assemblies.

SURVEILLANCE REQUIRDIENTS SURVEILLANCE FREQUENCY SR 3.7.11.1 Operate each CREACUS train for 31 days on a STAGGERED TEST a 15 minutes.

BASIS (continued)

SAN ONOFRE--UNIT 2 3.7-26 AMEN 0 MENT NO.

l e

SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.7.11.2 Perform required CREACUS filter testing in In accordance accordance with Ventilation Filter Testing with the VFTP Program (VFTP).

24 months SR 3.7.11.3 Verify each CREACUS train actuates on an actual or simulated actuation signal.

SR 3.7.11.4 Verify one CREACUS train can maintain a 24 months on a positive pressure of n 0.125 inches water STAGGERED TEST gauge, relative to the atmosphere during BASIS the energency radiation state of the energency mode of operation.

t 1

\\

e d

SAN ONOFRE--UNIT 2 3.7-27 AMEN 0 MENT NO.

i

.v 3 :.'..

g 3.7 PLANT SYSTEMS B 3.7.11 Control Room Emergency Air Cleanup System (CREACUS)

BASES

=

BACKGROUND The CREACUS provides a protected environment from which operators can control the plant following an uncontroiled release of radioactivity.

The CREACUS consists of two independent, redundant trains that recirculate and filter the control room air.

Each CREACUS train consists of emergency air conditioning unit, emergency ventilation air supply unit, emergency isolation dampers, and cooling coils and two cabinet coolers per Unit.

Each emergency air conditioning unit includes a prefilter, a high efficiency particulate air (HEPA) filter, an activated carbon adsorber section for removal of gaseous activity (principally iodine), and a fan. A.second bank of HEPA filters follows the adsorber section to collect carbon fines.

Each emergency ventilation air supply unit includes prefilter, HEPA filter, carbon adsorber and fan. Ductwork, motor-operated dampers, and instrumentation also form part of the system. Air and motor-operated dampers are provided for air volume control and system isolation purposes.

Upon receipt of the actuating signal, normal air supply to the control room is isolated, and the stream of ventilation air is recirculated through the ' system's filter trains.

The prefilters remove any large particles in the air to prevent excessive loading of the HEPA filters and charcoal adsorbers. Continuous operation of each train for at least 15 minutes per month verifies proper system operability.

There are two CREACUS operational modes. Emergency mo'.e is an operational mode when the control room is isolated to protect operational personnel from radioactive expostre through the duration of any one of the postulated I'miting i

faultsdiscussedinChapter15UFSAR(Ref.2).

Isclation mode is an operational mode when the control room is isolated to protect operational personnel from toxic gasses and smoke.

Actuation of the CREACUS places the system into either of two separate states of operation, depending on the initiation signal. Actuation of the system to the emergency node of operation closes tne unfiltered-outside-air intake (continued)

U-SANONOFRE--UNITg, B 3.7-62 AMENDMENT NO.

. D '...

]

8ASES BACKGROUND and unfiltered exhaust dampers, and aligns the system for -

(continued) recirculation of control room air through the redundant trains of HEPA and charcoal filters.

The emergency mode initiates pressurization of the control room.

Outside air is added to the air being recirculated from the control. room.

Pressurization of the control room prevents infiltration of unfiltered air from the surrounding areas of the building.

The control room supply and the outside air supply of the nonnal control room HVAC are monitored by radiation and -

toxic-gas detectors respectively. One detector output above the setpoint will cause actuation of the emergency mode'or isolation mode as required. The actions of the isolation mode are more restrictive, and will override the actions of the emergency mode of operation. However, toxic gas and radiation events are not considered to occur concurrently.

A single train will pressurize the control room to at least~

0.125 inches water gauge, and provides an air exchange rate in excess of 45% per hour. The CREACUS operation in maintaining the control room habitable is discussed in j

Reference 1.

t Redundant recirculation trains provide the required filtration should an excessive pressure drop develop across the other filter train. Nonnally-open isolation dampers are arranged in series pairs so that one' damper's failure to shut will not result 'in a breach of isolation. The CREACUS is designed in accordance with Seismic Category I requirements.

The CREACUS is designed to maintain the control room environment for 30 days of continuous occupancy after a Design Basis Accident (DBA) without exceeding a 5-rem c

whole-body dose.

e APPLICABLE The CREACUS components are arranged in redundant safety SAFETY ANALYSES related ventilation trains. The location of components and ducting within the control room envelope ensures an adequate supply-of filtered air to all areas requiring access.

(continued)

O SANONOFRE--UNIT 4 8 3.7-63 AMENOMENT NO.

i i

_ =...

^'

2 BASES APPLICABLE The CREACUS provides airborne radiological protection for SAFETY ANALYSES the control room operators, as demonstrated by the control (continued) room accident dose analyses for the most limiting design basis loss of coolant accident fission product release presented in the UFSAR, Chapter 15 (Ref. 2).

The analysis of toxic gas releases demonstrates that the toxicity limits are not exceeded in the control room following a toxic chemical release, as presented. in Reference 1.

The worst case single active failure of a component of the CREACUS, assuming a loss of offsite power, does not impair I

the ability of the system to perform its design function.

1 The CREACUS satisfies Criterion 3 of the NRC Policy Statement.

LC0 Two independent and redundant trains of the CREACUS are required to.be OPERABLE to ensure that at least one is available, assuming that a single failure disables the other r

train. Total system failure could result in a control room operator receiving a dose Tn excess of 5 res in the event of

?

a large radioactive release.

The CREACUS is considered OPERABLE when the individual components necessary to control operator exposure are OPERABLE in both trains. A CREACUS train is considered i

OPERABLE when the associated:

- a.

Fan is OPERABLE; y..

b..J.HfPK ~ filters and charcoal adsorber are not-eicessively

~-._;;?ms.tricting flow, and are capable of-performing their

p p S_:f'L ftRj ation functions; and

~

, c.

Ductwork, valves, and dampers are OPERABLE, and air

_ p [,". ~

circulation can be maintained.

yp.

In addition, the control room boundary must be maintained, or administrative 1y controlled, including the integrity of the walls, floors, ceilings, ductwork.and access doors.

me h

(continued)

SANONOFRE--UNIT $

B 3.7-64 AMEN 0 MENT NO.

BASES (continued)

APPLICABILITY In MODES 1, 2, 3, and 4, the CREACUS must be OPERABLE to limit operator exposure during and following a OBA.

In MODES 5 and 6, the CREACUS is required to cope with the release from a rupture of an outside waste gas tank.

During movement of irradiated fuel assemblies, the CREACUS must be OPERABLE to cope with the release from a fuel handling accident.

ACTIONS l ACTION statements are modified by a NOTE:

"Each Unit shall enter applicable ACTIONS separately." CREACUS is a shared system between Unit 2 and Unit 3.

LC0 does not address the d.-M.Sd!47 [7 operational situation when the units are in different operational MODES. Without this NOTE it may not be clear what ACTION should be taken.

A.1 With one CREACUS train inoperable, action must be taken to restore OPERABLE status within 7 days.

In this Condition, the remaining OPERABLE CREACUS subsystem is adequate to perform control room radiation protection function.

l Mowever, the overall reliability is reduced because a single failure in the OPERABLE CREACUS train could result in loss of CREACUS function. The 7 day Completion Time is based on the low probability of a DBA occurring during this time period, and the ability of the remaining train to provide J

the required capability.

B.1 and B.2

\\

If the inoperable CREACUS cannot be restored to OPERABLE status within the required Completion Time in MODE 1, 2, 3, or 4, the unit must be placed in a MODE that minimizes the accident risk. To achieve this status, the unit must be i

placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging unit systems.

(continued)

SAN ONOFRE--UNIT 2.

B 3.7-65 AMENOMENT NO.

INSERT "A" ACTIONS statements are modified by two NOTES. NOTE 1 reads: "Each Unit shall enter applicable ACTIONS separately

CREACUS is a shared system between Unit 2 and Unit 3.

LC0 does not address the operational situation when the units are in different operational MODES. Without this NOTE it may not be clear what ACTION should be taken.

NOTE 2 reads: "The provisions af LC0 3.0.4 are not applicable when entering MODES 5, 6, or defueled configuration."

In accordance with the APPLICABILITY statement "or during movement of irradiated fuel assemblies", OPERABILITY of the CREACUS will be ensured prior to movement of irradiated fuel assemblies.

Therefore, the only threshold between defueled configuration and MODE 6 is the position of the first irradiated fuel assembly--whether it is in the reactor vessel or external to it. This threshold has no safety significance because the only credible event during the transition from a defueled configuration to MODE 6 and from MODE 6 to defueled configuration is a Design Basis Fuel Handling Accident which is covered by the LC0 APPLICABILITY.

Therefore, this threshold can be excepted from LCO 3.0.4.

The threshold of entering MODE 5 from MODE 6 consists of fully tightening the last reactor vessel head closure bolt. This evolution has no safety significance from the point of view of isolating the control room from external hazards. Therefore, this MODE change can be excepted from LCO 3.0.4.

The threshold of entering MODE 6 from MODE 5 consists of untightening at least one reactor vessel head closure bolt.

If no irradiated fuel assemblies are being moved, this evolution has no safety significance from the point of view of isolating the control room from external hazards.

Therefore, this MODE change can be excepted from LC0 3.0.4 also.

The threshold of entering MODE 5 from MODE 4 consists of decreasing Reactor

> 200*F to T 5 200aF by Coolant System (RCS) temperature from 350cF > TIf no irradiated E!el assemblies, ya initiating shutdown cooling.

moved, this evolution has no safety significance from the point of view of isolating the control room from external hazards.

Therefore, this MODE change can be excepted from LCO 3.0.4 also.

i

i:. 5 3

3.'

BASES ACTICNS C.I. C.2.1. and C.2.2 (continued) j In MCDE 5 or 6, or during movement of irradiated fuel assemblies, if Required Action A.1 cannot be completedwithin the required Completion Time, the OPERABLE CREACUS train must be imediately placed in the emergency made of operation.

This action ensures that the remaining train is OPERABLE, that no failures preventing automatic actuation will occur, and that any active failure will be readily detected.

An alternative to Required Action C.1 is to imediately suspend activities that could result in a release of radioactivity that might require isolation of the control room.

This places the unit in a condition that minimizes the accident risk. This does not preclude the movement of fuel assemblies to a safe position.

D.d If both CREACUS trains are inoperable in MODE 1, 2, 3, or 4, the CREACUS may not be capable of performing the intended 1

function and the unit is in a condition outside the accident i

analyses. Therefore, LCO 3.0.3 must be entered imediately.

E.1 and E.2 When in MODES 5 or 6, or during movement of irradiated fuel assemblies with two trains inoperable, action must be taken immediately to suspend activities that could result in a release of radioactivity that might enter the control room.

This places the unit in a condition that minimizes the accident risk. This does not preclude the movement of fuel to a safe position.

w SURVEIL SR 3.7.11.1 REQUIREMENTS l

Standby systems should be checkect periodically to ensure that they function properly. Sir.ce the environment and normal operating conditions on this system are not severe,

)

testing each train once every month provides an adequate check on this system.

(continued)

SAN ONOFRE.--UNIT &

B 3.7-66 AMENDMENT NO.

- Uinf e

1.s

.L

~,

BASES SURVEILLANCE SR 3.7.11.1 (continued)

REQUIREMENTS Systems not requiring humidity control need only be operated for t 15 minutes to demonstrate the function of the system.

The 31 day on a STAGGERED TEST BASIS Frequency is based on the known reliability of the equipment, and the two train redundancy available.

SR 3.7.11.2 This SR verifies that the required CREACUS testing is performed in accordance with the Ventilation Filter Testing Program (VFTP).

The CREACUS filter tests are based on Regulatory Guide 1.52 (Ref. 3).

The VFTP includes testing HEPA filter performance, charcoal adsorber efficiency, minimum system flow rate, and the physical properties of the activated charcoal (general use and following specific operations).

Specific test frequencies and additional infonnation are discussed in detail in the VFTP.

SR 3.7.11.3 This SR verifies each CREACUS train starts and operates on i

an actual or simulated actuation signal. The Frequency of 24 months is consistent with that specified in Reference 3.

SR 3.7.11.4 This SR verifies the integrity of the control room enclosure and the assumed inleakage rates of potentially contaminated air. The control room positive pressure, with respect to potentially contaminated atmosphere, is periodically tested to verify proper function of the CREACUS. During the emergency radiation state of the emergency mode of operation, the CREACUS is designed to pressurize the control roce = 0.125 inches water gauge positive pressure with respect to the atmosphere in order to prevent unfiltered inleakage. The CREACUS is designed to maintain this positive pressure with one train.

+

d.-

(continuer SAN ONOFRE--UNIT 1 B 3.7-67 AMENDNENT N0.

i.'..

i 2.

~

BASES (continued)

REFERENCES 1.

UFSAR. Section 9.4.

2.

UFSAR, Chapter 15.

3.

Regulatory Guide 1.52 (Rev. 2).

3 4

SAN ON0FRE--UNIT 1 B 3.7-68 AMEN 0 MENT NO.

)

PCN-299 (TSIP)

TECHNICAL SPECIFICATION 3.7.11 and BASES (with wrked-up changes proposed by PCN-439)

UNIT 3 1

l.~

l 1

i 3.7. PLANT SYSTEMS i

Control Room Emergency Air Cleanup System (CREACUS)

)

l 3.7.11 LCO 3.7.11 Two CREACUS trains shall be OPERABLE.

APPLICABILITY:

M00 5 1 A 5 g irra iated fuel assemblies.

1

NOTE----------------------------

ACTIONS MIT

-.$$.5 $ b--------

REQUIRED ACTION COMPLETION TIME CONDITION A.

One CREACUS train A.1 Restore CREACUS train 7 days to OPERABLE status.

inoperable.

I 8.

Required Action and 8.1 Be in M00E 3.

6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months associated Completion t.

Time of Condition A Atgl not met in MODE 1, 2, B.2 Be in MODE 5.

36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months

3. or 4.

C.

Required Action and C.1 Place OPERA 8tE Imediately associated Cagletion CREACUS train in Time of Condition A emergency radiation not met in NODES 5 protection mode.

or 6, or during i

i anvemaet of irradiated Q8 feel assemblies.

(continued)

)

V-

-4 do 3.0.4i are 'c & */ W T " '

2.7h povisiexs $seG r6, oe n'efua/1e'*g'ahe, wA<n en4r44 p AMENOMENT NO.

3.7-25 SANONOFRE--UNITj

.s

ACT10N$_

REQUIRED ACTION COMPLETION TIME CONDITION C.

(continued)'

C.2.1 Sus;end CORE Imediately ALTERATIONS.

A10 C.2.2 Suspend movement of Imediately irradiated fuel assemblies.

D.

Two CREACUS trains 0.1 Enter LCO 3.0.3.

Imediately inoperable in MODE 1, 2, 3, or 4.

E.

Two CREACUS trains E.1 Suspend CORE Imediately inoperable in MODES 5 ALTERATIONS.

or 6, or during movement of irradiated

!!gl fuel assemblies.

Immediately E.2 Suspend movement of irradiated fuel assemblies.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.7.12.E Operate each CREACUS train for 31 days on a a 15 minutes.

STAGGERED TEST r

BASIS i

(continued)

SANON0FRE--UNITj 3.7-26 ANENDNENT NO.

..m (continued)

FREQUENCY S#URVEILLANCE REQUIREMENTS

~

SURVEILLANCE In accordance Perfort required CREACUS filter testing with the VFTP s

i 3.7.11.2 SR Program (VFTP).

l 24 months Verify each CREACUS train actuates on an l

actual or simulated actuation signa.

3.7.11.3 SR 24 months on a STAGGERED TEST Verify one CREACUS train can maintain a positive pressure of e 0.125 inches water 8 ASIS gauge, relative to the atmosphere during SR 3.7.11.4 h

the emergency radiation state of t e emergency mode of operation.

1 w

f AMENDMENT NO.

3.7-27 SANON0FRE--UNITJ j

5 B 3.7 PLANT SYSTEMS 2

8 3.7.11 Control Room Emergency Air Cleanup System (CREACUS) i BASES BACKGROUND The CREACUS provides a protected environment from which j

operators can control the plant following an uncontrolled release of radioactivity.

The CREACUS consists of two independent, redundant trains that recirculate and filter the control room air.

Each j

CREACUS train consists of emergency air conditioning unit, 1

emergency ventilation air supply unit, emergency isolation dampers, and cooling coils and two cabinet coolers per Unit.

Each emergency air conditioning unit includes a prefilter, a l

high efficiency particulate air (HEPA) filter, an activated carbon adsorber section for removal of gaseous activity i

(principally iodine), and a fan. A second bank of HEPA filters follows the adsorber section to collect carbon fines.

Each emergency ventilation air supply unit includes prefilter, HEPA filter, carbon adsorber and fan. Ductwork, motor-operated dampers, and instrumentation also fonn part of the system.

Air and motor-operated dampers are provided i

for air volume control and system isolation purposes.

Upon receipt of the actuating signal, normal air supply to the control room is isolated, and the stream of ventilation air is recirculated through the ' system's filter trains.

The prefilters remove any large particles in the air to prevent i

excessive loading of the HEPA filters and charcoal adsorbers. Continuous operation of each train for at least 15 minutes per month verifies proper system operability.

There are two CREACUS operational modes. Emergency mode is an operational mode when the control room is isolated to protect operational personnel from radioactive exposure through the duration of any one of the postulated limiting faultsdiscussedinChapter15UFSAR(Ref.2).

Isolation 1

mode is an operational mode when the control room is isolated to protect operational personnel from toxic gasses and smoke.

Actuation of the CREACUS places the system into either of two separate states of operation, depending on the initiation signal. Actuation of the system to the emergency mode of operation closes the unfiltered-outside-air intake (continued) b, SAN ONOFRE--UNIT 3 8 3.7-62 AMENOMENT NO.

4

BASES BACKGROUND and unfiltered exhaust dampers, and aligns the system for (continued) recirculation of control room air through the redundant trains of HEPA and charcoal filters.

The emergency mode initiates pressurization of the control room.

Outside air is added to the air being recirculated from the control room. Pressurization of the control room prevents infiltration of unfiltered air from the surrounding areas of the building.

The control room supply and the outside air supply of the nonnal control room HVAC are monitored by radiation and toxic-gas detectors respectively. One detector output above the setpoint will cause actuation of the emergency mode or isolation mode as required.

The actions of the isolation mode are more restrictive, and will override the actions of the emergency mode of operation. However, toxic gas and radiation events are not considered to occur concurrently.

A single train will pressurize the control room to at least 0.125 inches water gauge, and provides an air exchange rate in excess of 45% per hour. The CREACUS operation in maintaining the control room habitable is discussed in Reference 1.

Redundant recirculation trains provide the required filtration should an excessive pressure drop develop across the other filter train. Normally-open isolation dampers are arranged in series pairs so that one damper's failure to shut will not result in a breach of isolation.

The CREACUS is designed in accordance with Seismic Category I requi rements.

The CREACUS is designed to maintain the control room environment for 30 days of continuous occupancy after a Design Basis Accident (DBA) without exceeding a 5-rem whole-body dose.

APPLICABLE The CREACUS components are arranged in redundant safety SAFETY ANALYSES related ventilation trains. The location of components and ducting within the control room envelope ensures an adequate supply of filtered air to all areas requiring access.

(continued) f' i

SAN ONOFRE--UNIT 3 8 3.7-63 AMENDMENT NO.

i

t

I 3 3. '. '..

BASES APPLICABLE The CREACUS provides airborne radiological protection for SAFETY ANALYSES the. control room operators, as demonstrated by the control (continued) room accident dose analyses for.the most limiting design basis loss of coolant accident fission procuct release presented in the UFSAR, Chapter 15 (Ref. 2).

The analysis of toxic gas releases demonstrates that the toxicity limits are not exceeded in the control room following a toxic chemical release, as presented in Reference 1.

The worst case single active failure of a component of the CREACUS, assuming a loss of offsite power, does not impair the ability of the system to perform its design function.

The CREACUS satisfies Criterion 3 of the NRC Policy Statement.

q LCO Two independent and redundant trains of the CREACUS are required to be OPERABLE to ensure that at least one is available, assuming that a. single failure disables the other train.

Total t,ystem failure could result in a control room j

r operator receiving a doseln excess of 5 res in the event of

.?

a large radioactive release.

The CREACUS is considered OPERABLE'when the individual h

components necessary to control operator exposure are OPERABLE in both trains. A CREACUS train is considered i

OPERABLE when the associated:

a. - Fan is OPERABLE; 5.

1

b.,' HfPX ' filters and charcoal adsorber are not-ex'cessively

' :ims.tricting flow, and are capable of-performing their

-s W,,~,,,;, w fi Qration functions; and m

f Ductwork, valves, and dampers are OPERABLE, and air

_ c.

9,7,,f..'

circulation can be maintained.

e In addition, the cor. trol room boundary must be maintained, or administratively controlled, including the integrity of the walls, floors, ceilings, ductwork,.and access doors.

d (continued) 1 l

SAN ONOFRE--UNIT 3 8 3.7-64 AMENOMENT NO.

-)

BASES (continued)

APPLICABILITY In MODES 1, 2, 3, and 4, the CREACUS must be OPERABLE to limit operator exposure during and following a DBA.

In MODES 5 and 6, the CREACUS is required to cope with the release from a rupture of an outside waste gas tank.

During movement of irradiated fuel assemblies, the CREACUS must be OPERABLE to cope with the release from a fuel handling accident.

ACTIONS ACTION statements are modified by a NOTE:

"Each Unit shall enter applicable ACTIONS separately." CREACUS is a shared LCO does not address tne ggg 7 "[m system between Unit 2 and Unit 3.,ts are in different operational situation when the uni operational MODES. Without this NOTE it may not be clear i

(whatACTIONshouldbetaken.j

'A.1 With one CREACUS train inoperable, action must be taken to restore OPERABLE status within 7 days.

In this Condition, the remaining OPERABLE CREACUS subsystem is adequate to perform control room radiation protection function.

However, the overall reliability is reduced because a single i

I failure in the OPERABLE CREACUS train could result in loss of CREACUS function.

The 7 day Completion Time is based on the low probability of a DBA occurring during this time period, and the ability of the remaining train to provide the required capability.

B.1 and 8.2 i

If the inoperable CREACUS cannot be restored to OPERABLE status within the required Completion Time in MODE 1, 2, 3, or 4, the unit must be placed in a MODE that minimizes the t

accident risk. To achieve this status, the unit must be placed in at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , and in MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months .

The allowed Completion Times are reasonable, based on operating experience, to reach the recuired unit conditions from full power conditions in an orcerly manner and without challenging unit. systems.

(continued)

SAN ONOFRE--UNIT 3 B 3.7-65 AMENOMENT NO.

INSERT "A" ACTIONS statements are modified by two NOTES. NOTE 1 reads: "Each Unit shall enter applicable ACTIONS separately." CREACUS is a shared system between Unit 2 and Unit 3.

LC0 does not address the operational situation when the units are in different operational MODES. Without this NOTE it may not be clear what ACTION should be taken.

NOTE 2 reads: "The provisions of LC0 3.0.4 are not applicable when entering MODES 5, 6, or defueled configuration."

In accordance with the APPLICABILITY statement "or during movement of irradiated fuel assemblies", OPERABILITY of the CREACUS will be ensured prior to movement of irradiated fuel assemblies.

Therefore, the only threshold between defueled configuration and MODE 6 is the position of the first irradiated fuel assembly--whether it is in the reactor vessel or external to it.

This threshold has no safety significance because the only credible event during the transition from a defueled configuration to MODE 6 and from MODE 6 to defueled configuration is a Design Basis Fuel Handling Accident which is covered by the LC0 APPLICABILITY.

Therefore, this threshold can be excepted from LC0 3.0.4.

The threshold of entering MODE 5 from MODE 6 consists of fully tightening the last reactor vessel head closure bolt. This evolution has no safety significance from the point of view of isolating the control room from external hazards.

Therefore, this MODE change can be excepted from LC0 3.0.4.

The threshold of entering MODE 6 from MODE 5 consists of untightening at least one reactor vessel head closure bolt.

If no irradiated fuel assemblies are being moved, this evolution has no safety significance from the point of view of isolating the control room from external hazards. Therefore, this MODE change can be excepted from LC0 3.0.4 also.

The threshold of entering MODE 5 from MODE 4 consists of decreasing Reactor Coolant System (RCS) temperature from 350af > T

> 200aF to T 5 200aF by initiating shutdown cooling.

IfnoirradiatedE!elassemblies, yare being moved, this evolution has no safety significance from the point of view of isolating the control room from external hazards. Therefore, this MODE change can be excepted from LCO 3.0.4 also.

1 ap &Of Osh b

- - - - ~ - - _ - _ - _ _ _ - _

. i:..

5 b.'

BASES ACTIONS C.I. C.2.1. and C.2.2 (continued)

In MODE 5 or 6, or during movement of irradiated fuel assemblies, if Required Action A.1 cannot be completedwithin the required Completion Time, the OPERABLE CREACUS train must be imediately placed in the emergency mode of operation.

This action ensures that the remaining train is OPERABLE, that no failures preventing automatic actuation will occur, and that any active failure will be readily detected.

An alternative to Required Action C.1 is to imediately suspend activities that could result in a release of radioactivity that might require isolation of the control This places the unit in a condition that minimizes room.

the accident risk.

This does not preclude the movement of fuel cssemblies to a safe position.

Q.d If both CREACUS trains are inoperable in MODE 1, 2, 3, or 4, the CREACUS may not be capable of performing the intended function and the unit is in a condition outside the accident analyses.

Therefore, LC0 3.0.3 must be entered immediately.

E.1 and E.2 When in MODES 5 or 6, or during movement of irradiated fuel assemblies with two trains inoperable, action must be taken immediately to suspend activities that could result in a release of radioactivity that might enter the control room.

This places the unit in a condition that minimizes the accident risk.

This does not preclude the movement of fuel to a safe position.

SURVEILLAME SR 3.7.11.1 REQUIREMENTS Standby systems should be checked periodically to ensure that they function properly. Since the environment and normal operating conditions on this system are not severe, testing each train once every month provides an adequate check on this system.

(continued)

U<-

SAN ONOFRE.--UNIT 3 B 3.7-66 AMENOMENT NO.

1

.U..i 3 3.7.ll 3

8ASES i

1 SURVEILLANCE SR 3.7.11.1 (continued)

REQUIREMENTS Systems not requiring humidity control need only be operated for a 15 minutes to demonstrate the function of the system.

The 31 day on a STAGGERED TEST BASIS Frequency is based on the known reliability of the equipment, and the two train redundancy available.

SR 3.7.11.2 This SR verifies that the required CREACUS testing is perfonned in accordance with the Ventilation Filter Testing Program (VFTP).

The CREACUS filter tests are based on Regulatory Guide 1.52 (Ref. 3).

The VFTP includes testing HEPA filter performance, charcoal adsorber efficiency, minimum system flow rate, and the physical properties of the activated charcoal (general use and following specific operations). Specific test frequencies and additional information are discussed in detail in the VFTP.

SR 3.7.11.3 This SR verifies each CREACUS train starts and operates on an actual or simulated actuation signal. The Frequency of 24 months is consistent with that specified in Reference 3.

SR 3.7.11.4 This SR verifies the integrity of the control room enclosure and the assumed inleakage rates of potentially contaminated air. The control room positive pressure, with respect to potentially contaminated atmosphere, is periodically tested to verify proper function of the CREACUS. During the emergency radiation state of the emergency mode of operation, the CREACUS is designed to pressurize the control room = 0.125 inches water gauge positive pressure with respect to the atmosphere in order to prevent unfiltered inleakage. The CREACUS is designed to maintain this positive pressure with one train.

b (continued)

SAN ONOFRE--UNIT 3 8 3.7-67 AMENDMENT NO.

~

3

BASES (continued)

REFERENCES 1.

UFSAR, Section 9.4.

2.

UFSAR, Chapter 15, i

3.

Regulatory Guide 1.52 (Rev. 2).

1 SAN ONOFRE--UNIT 3 8 3.7-68 AMENDHENT NO.

i 4

1 ENCL 0SURE 3

i l

l 1

EXISTING TECHNICAL SPECIFICATION 3/4.7.5 and BASES (with marked-up changes proposed by pcn-407 and PCN-439)

UNIT 2 7

h:..;- Sv 5~ i5 7, 5 C "'.~::t C 4 EIRGEC A::t C'.! 'rJP Si sTE" w

s, t..q T I,, CO*!":ITICN % OPE:ATION 7,

3,7.5 Two inde;ende c:ntrol recm e ergen:y air cleanup systems shall te N

CFERA3' E-

=

t

C f.3 ! L 1IY :

ALL hE cr clur//t /wa/cmex4 f FAtodd2kd[u(LaMcMhddf SLN EseW4f$/ heQ5'A*! ol6/d(E'R OSS ANDNS Unit 2 cr 3 in F0DE 1, 2, 3 er tegos/tehg With one centrol room emergency air cleanup system inoperable, restore the ine:erable system to OPER LE status within 7 days or be in at~least H0i A STAN:3Y within the next 6 urs and in COLD SHUTDOWN within the following x 30 h;ur5. ot*

6[ MM" Units 2 3 in M00E 5 a,

With one centr:1 reem emergency air cleanup system inoperable, restere the inoperable system to OPERABLE status witnin 7 cays er initiate and maintain operati:n of the remaining OPERABLE control rece emergency air cleanup system in the recirculation mode.

b.

With both centrol roem emergency air. cleanup systems ineperable, er h

with the OPERABLE centrol reem aergency air cleanup' system re:uire:

to be in the recirculatien mode by ACTION (a), net capable of bef ;

4) p:ve ed by an OPERABLE emergency power seur:e, suspend all c: era:i:

v1 Lv h ;a_fJ1P r p sitive reactivity changes h a assema_ 4 e m ai te ~

fih n.1 r

if a le in M**E :

e

+

W' "s

M ta Hen. c.

G re' n e a 9 9 ra p e w,

ntri~ig R

The pecor'src s

....T5NfC.~.k.fd M D,/f # M SURv

u 4.7.5 Each contrel roem emergency air cleanup system 1ha11 be demonstrate:

OPERABLE:

At least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying that the centrol roem air a.

terparature is less than or equal to 110*F.

b' b.

At least once per 31 days on a STAGGERED TEST BASIS by initating, D

from the control room, flow through the HEPA filters and char::ai b

a*An ud verifyino that the system operates for at least Mt1 tours with the heaters % /Smt'isu/dS.

8 At Isast once per 18 stonths or (1) af ter any structural r.aintenar:e c.

j on the HEPA filter or charcoal adsorber housings, or (2) fo11 ewing painting, fire or chemical release in any ventilation zone n

A coe.municating with the system by:

'~ Verifying that with the system ope-ating at a flow rate cf

1. N 35485 cfm + 10% for the air conditioning unit, and 2050 : 150 ~'-

N' g for the ventilatien unit and recirculating thre.sgh the res;e:~- 'f I

j HEPA filters and charcoal adsorbers, leakage through the syftt~

diverting valves is less than or equal to 1% air conditiening unit and 1% ventilation unit when the system is tested by J

admittingcold00Pattherespectiveintake[

j

~

MAY.16190 "Starec sys:en with San Onofre - Unit 3.

A'.tE.CMENT tc. " i S IN C'.",r RE LT,T 2 3/* 7-13

.pttyi SYSTEMS t

i 4

5.y/EnL ANCE REOUIREMENTS (Continueel 1

2.

Verifying that the cleanup system satisfies the in place testing acceptance criteria and uses the test procedures cf Regulatory Positions C.S.a, C 5.c and C.S.d of Regulatory Guide 1.52, Revision 2, March 1978, and the system flow rate is 2050 2 150 cfm for the ventilation unit and 35,485 cfm IC%

l' for the air conditioning unit.

3.

Verifying within 31 days af ter removal that a laboratory analysis of a representative carbon sample obtained in accordance with Regulatory Position C.6.b of Regulatory Guide 1.52, Revision 2, March 1978, meets the laboratory testing criteria of Regulatory Position C.6.a of Regulatory Guide 1.52, Revision 2, March 1978.

4 Verifying a system flow rate of 2050 2 150 cfm for the l

ventilation unit and 35,485 cfm 10% for the air conditioning unit during system operation when. tested in accordance witn l

ANSI H510-1975.

d.

After every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of charcoal adsorber operation by verifying within 31 days after rem 0 val that a laboratory analysis of a re;tesentative carbon sam;1e obtained in a:ccrdance with Regulat: j

, Position C.6.b of Regulat:ry Guide 1.52, Revision 2, March 1975, meets the laboratory testing criteria of Regulatory Position C.6.a of Regulatory Guide 1.52, Revision 2, March 1978.

At least once per 18 months by:

e.

1.

Verifying that the pressure drop across the combined HEPA filters and charcoal adsorber bank.s is less than 7.0 inches l,

Water Gauge ventilation unit and less than 7.3 inches Water Gauge air conditioning unit while operating the system at a l

flow rate of 2050 150 cfm for the ventilation unit and 35,485 cfm t 10% for the air conditioning unit.

h Verifying that on a control room isolation test signal, the system automatically switches into the emergency mode of operation'with flow through the HEPA filters and charcoal' adsorber banks.

3.

Verifying that on a toxic gas isolation test signal, the sysce-automatically switches into the isolation mode of operation with flow through the HEPA filters and charcoal adsorber banks.

4.

Verifying that the system maintains the control room at a positive pressure of greater than or equal to 1/8 inch W.G.

relative to the outside atmosphere during system operation in i

the emergency mode.

W 5.

Verifying that the heaters dissipate 4.8 kw t 5% when tested in accordance with ANSI H510-g.,

a s

san ol0FRE-UNIT 2 3/4 7-14 AMENOMENT NO. Il

... -. - ~ _.

. Lui SYSTEM _S J

p

}'

g-

,y.-

,..,, n.

. u._..

e After each complete or partial replacement of a HEPA filter bank by f.

verifying that the HEPA filter banks remove greater _ than or ez'.:a1 to 99.95% of.the DOP when they are tested in place in accordance with ANSI H510-1975 while operating the system at a flow rate of 2050 150 cfm for the ventilation unit and 35,485 cfm : 10% for tr.e l

air conditioning unit.

After each complete or partial replace =ent of a charcoal adsorber g.

bank by verifying that the charcoal adsorbers remove greater than er equal to 99.95% of a halogenated hydrocarbon refrigerant test gas when they are tested in place in accordance with ANSI H510-1975 while operating the system at a flow rate of 2050 2 150 cfm for the j

ventilation' unit and 35,485 cfm : 10% for the air conditioning unit.

i 1

. f-c i

a J

1

' s....'

q FEB1810M N

SAN-ONOFRE-UNIT 2 3/4 7-15 AMENOMENT NO.

9 PLANT SYSTEMS r

BASES 3/a.7.5 CONTROL ROCM EMERGENCY AIR CLEANUP SYSTEM frem which operat:rs can The CREACUS provides a protected environment 4

i control the plant following an uncontrolled release of radioactivity, or toxic gas.

L The CREACUS consists of two independent, redundant trains that recircu Each train consists of a prefilter, a and filter the control room air.

(HEPA) filter, an activated charcoal high efficiency particulate airadsorber section for removal of (for A second bank of HEPA filter follows the adsorber section emergency air conditioning unit only) and is used to retain c a fan.

downstream of carbon adsorber.

Ductwork, includes prefilter, HEPA filter, charcoal adsorber, and fan.

motor-operated dampers, and instrumentation als system isolation purposes.

b Upon receipt of the actuating signal, nonnal air supply to the co room is isolated, and the stream of ventilation air is recirculated The prefilters remove any lar;e through the system's filter trains.

particles in the air to prevent excessive loading of the HEPA filters ar 15 Continuous operation of each train for at least charcoal adsorbers.

minutes per month verifie,s proper system operation.

g There are two CREACUS operational modes. Emergency mode is an mode when the control room is isolated to prevent operation personnel f the radioactive exposure through the duration of any one of the postula Isolation mode is limiting faults discussed in FSAR, Chapter 15 (Ref.2).

Q an operational mode when control room is isolated to protect oper N

personnel from toxic gases and smoke.

Actuation of the CREACUS places the system into either of two separateA states of the operation, depending on the initiatio Outside-air intake and exhaust dampers and aligns the system f:r recirculation of control room air through the redundan charcoal filters.Outside air is added to the air being recirculated frem tne control room.

control room.

Pressurization of the control room prevents infiltration of infiltered air from the surrounding areas of the building.

The actions taken in the toxic gas isolation mode are the same, exce that the signal switches control room ventilation to an isolation mcce preventing outside air from entering the control room.

B 3/4.7-4 SAN ONOFRE-UNIT 2,

PLANT SYSTEMS BASES 3/4.7,5 CONTROL ROOM EMERGENCY AIR CLEANUP SYSTEM (continu The control room supply and the outside air supply of the normal control room HVAC is monitored by radiation and toxic-gas detectors respectively.

above the setpoint will cause actuation of tne One detector _ output The actions of the toxic emergency mode or isolation mode as required. gas the emergency radiation mode. However, toxic gas and radiation events are not considered to occur concurrently.

A single train will pressurize the control room to at least 0.125 inches water gauge, and provides an air exchange rate in excess of 45% per ho g

Redundant recirculation trains provide the required filtration should an. Nor excessive pressure drop develop across the other filter train.

open isolation dampers are arranged in series pairs 50 that the fai The CREACUS one damper to shut will not result in a breach of isolation.

is designed in accordance with Seismic Category 1. requirements.

The CREACUS is designed to maintain the control room environment for 3 days of continuous occupancy after a Design Basis Accident (OBA) wi; exceeding a 5 rem whole body dose.

i SAN ONOFRE-UNIT 2 3 3/4.7-4a

EXISTING TECHNICAL SPECIFICATION 3/4.7.5 and BASES (with marked-up changes proposed by pcn-407 and PCN-439)

UNIT 3 l

'l g i SYSTEMS g CCNTROL RocM EMER0ENCY A* R c'.E ANUP SYSTEM" I

LIMITING CDNOTTION WP optRATION q' -

~

vi 3.7.5 Two independ control room emergency air cleanup systems anall be j

CPERAELE.

lE 4pptIcABILIU:

ALL DES e du, *,*c 4/unut / //mu60cdh asve5kg N

I le W

b k,d ACTION:

_b2dM[

or 3 in MODES 1, 2, 3 or 4:

h Unit With one control room eeer ency aiMeanup systra noperable, restore the inoperable system to OPE

.E status within 7 days or be in at least HOT 4

N STANOBy within the next 6 turs and in COLD SHUTOOWN within the following 3 in MODFS S fa i

moa emergency air cleancpr system inoperable, With one contrer restore the inoperable system to OPERASLE status within 7 days or a.

initiate and saintain operation of the remaining CPERABLE control I

roce amargency air cleanup system in the recirculation mode.

1 l

With both control room ecargency air cleanup systees inoperable, or I

with the OPERABLE control room amargency air cleanup systes required b.

E

)

4 to be in the recirculation mode by ACTION (a), not capable of being i

I D

powered by an OPERABLE energency power source, suspend all operatien i

4 volyi g. ElLTERAT1 NS or positive reactivity changes 2Wmmw w}i f

oreafi< c w?pueVm :>r<z akM'M*Ma% awns?4 t%"%%"MQ~

G j

SURVEI[

E1TTOUDERIST56# UM "N

2"MU'M f ach control room ansegency air cleanup systan shall be damonstrated

4.7.5 OPERABLE

At leasi. Soca por 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying that the cootrol roca air a.

terparature is less than or equal to 110*F.

At least erw:e per 31 days on a STAGGERED TEST BASIS by initating, frca the control roca, flew through the HEPA filters and charcoal h.

b.

4 adsorbers and verifying that the systaa operatas for at least O

$ #e w mm. vnn saa nowWon) /fm/ou/es k

~At leest once par 18 months or (1) after any structural naintenance on the )ffPA filtar or charcoal adsort>er housings, or (2) folleving

c..

l painting, fire or chemical release in any ventilation zone i

consunicating vpi systes by:

l Verifying that with the system operating at a flow rate of g

g, 8gg 35485 cfm + 10% for the air conditioning unit, and 2 N

1.

for the ventilation unit and recirculating through the respective HEPA filters and charcoal adsorbers, leakage through the system P

,g diverting valves is less than or equal to 1% air conditioning unit and 1% ventilation unit when the system is testall by admitting cold 00P_ at the respective inta

- (

" Shared system with San Onofre - Unit 2.

N M EffT NO. 3 3/4 7-14 SAN CHOFRE-UNIT 3 5

i

5 6

C. I SMVEILLECI. RIOUIREMENTS (Continuedl m

Virifying that the cleanup system satisfies the i y

2.

Regulatory Positions C.5.a. C.5.c and C.5.d of Regulatory c

Guide 1.52, Revision 2, March 1978, and the system flow rate is

}

i IC:

cfm for the ventilation unit and 35,485 cfm :

I 2050 2 150 A

for the air conditioning unit.

Verifying within 31 days after removal that a laboratory fj analysis of a restresentative carton sar:ple tb

/

3.

J Guide 1.52, Revision 2, March 1978, asets the

)

1i Guide.1.52, Revision 2, Karch 1971

}

2050

150 cfm for the Verifying a systa:a flow rate of i

ventilation unit and 35,485 cfm 210% for the air oncitioning f

4.

unit during system operation when tested in acco

'nce with f

ANSI H510-1975.

j Af ter every 720 hours0.00833 days 0.2 hours 0.00119 weeks 2.7396e-4 months of charcoal adsorber operat' m by actry g

within 31 days after removal that a laboratory arQsis of d.

[

t y representative carbon sample obtained in accordance with % a Pesition C.S.b of Regulatory Guida 1.52, R 6

of Regulatoy Guide 1.52, Revision 2, March 1978.

f At least once per 18 months by:

Verifying that the pressure drop across the combined HEPA e.

flitars and charcoal adsorber banits is less than 7.0 1.

Vater Gauge ventilation unit and less than 7.3 inches Water Gauge air conditioning unit while operating ~the systas at a cfm for the ventilation unit and flow rate of 2050 2 150 35,485 cfm 210% for the air conditioning unit.

Yorifying that on a control roce isolation test signal, the systaa automatically switchos into the e 2.

sdsorber banks.

Verifying that on a toxic gas isolation test signal, the sys k

autenatically switches into the isolation mode of operation 3.

k with flow through the HEPA filters and charcoal adsorber l*

Verifying that the system saintains the control roca at a positive pressure of greater than or equal t.o V8 inch i

in 4.

l relative to the outside atmosphere during system operat on r

q A

g the emerge g nede. Verifying that the heaters dissipate 4.8 kw 2 5% whe accordance with ANSI H510-1975.

~

Q 5.

s b

FEB i 8190 AMENDHENT NO. 3 3/4 7-15 I

d SAN ONOFRE-UNIT.3 5

e g ILLANCE REQUIREMENTS (Centinued, 3

After each complete or partial replacement of a HEPA filter bank by i

f.

verifying that the HEPA filter banks remove greater than or equal to 99.95% of the DOP when they are tested in place in accorcance with M5I H510-1975 while operating the system at a flow rate of 2050 2 150 cfm for the ventilation unit and 35,485 cfm 210% for the air conditioning unit.

Af ter each complete or' partial replacement of a charcoal adsorber t

g.

bank by verifying that the charcoal adsorbers remove greater than er l

equal to 99.95% of a halogenated hydrocarbon refrigerant test gas when they are tested in. place in accordance with MSI HS10-1975 l

while operating the syates at a flow rate of 2050 2 150 cfm for the 1

ventilation unit and 35,485 cfm 210% for the air conditioning unit.

I I

L 9

Y

.s u

I 1

'd 3 g yp

'~

AMatOM M NO. 3 3/4 7-16 1AN ON0FRE-tmIT 3

1 Pt h SYSTEMS f

r BASES 3/4.7.5 CONTROL ROOM EMERGENCY AIR CLEANUP SYSTEM from which operators can The CREACUS provides a protected environment control the plant following an uncontrolled release of radioactivity, :r toxic gas.

The CREACUS consists of two independent, redundant trains and filter the control room air.

filter, an activated chartcal high efficiency particulate air (HEPA) adsorber section for removal of gaseous activity (p i

emergency air conditioning unit only) and is used to retain c a fan.

downstream of carbon adsorber.

Ductwork, j

includes prefilter, HEPA filter, charcoal adsorber, and fan.

i motor-operated dampers, and instrumentation al I

system isolation purposes.

b Upon receipt of the actuating signal, normal air supply to the co recirculated room is isolated, and the stream of ventilation air is The prefilters remove any lar;e through the system's filter trains.

particles in the air to prevent excessive loading of the H charcoal adsorbers.

minutes per month verifies proptr system operation.

g There are two CREACUS operational modes. Emergency mode is a mode when the control room is isolated to prevent operation personn the radioactive exposure through the duration of any one of the postu Isolation mode is limiting faults discussed in FSAR, Chapter IS (Re personnel from toxic gases and smoke.

Actuation of the CREACUS places the system into either of two separat Actuation :f j

s44tes of the operation, depending on the initiatio autside-air intake and exhaust dampers and aligns the system f:r recirculation of control room air through the redundan charcoal filters.Outside air is added to the air being recirculated frem tre control room.

control room.

Pressurization of the control room prevents infiltration of infiltered from the surrounding areas of the building.

The actions taken in the toxic gas isolation mode are the same, exc that the signal switches control room ventilation to an isolation mec preventing outside air from entering the control room.

8 3/4.7-4 SAN ONOFRE-UNIT 3

A PLANT SYSTEMS BASES 3/4.7.5 CONTROL ROOM EMERGENCY AIR CLEANUP SYS The control room supply and the outside air supply of the normal control room HVAC is monitored by radiation and toxic-gas detectors respectiveis.the above the setpoint will cause actuation of One detector output The actions of the toxic emergency mode or isolation mode as required.

gas isolation mode are more restrictive, and will override the actions A

the emergency radiation mode. However, toxic gas and radiation events are I'

not considered to occur concurrently, A single train will pressurize the control room to at least 0.125 inches water gauge, and provides an air exchange rate in excess of 454 per hour g

f Redundant recirculation trains provide the required filtration should an Normally excessive pressure drop develop across the other filter train.

open isolation dampers are arranged in series pairs so that the failu i

The CREACUS one damper to shut will not result in a breach of isolation.

is designed in accordance with Seismic Category 1 requirements.

The CREACUS is designed to maintain the control room environment for 3 days of continuous occupancy after a Design Basis Accident (OBA) with exceeding a 5 rem whole body dose.

SAN ONOFRE-UNIT 3 3 3/4.7-4a

ML20072M360

Text

4.7.5 OPERABLE

4.7.5 OPERABLE

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