ML20108E333

Proposed Tech Specs,Consisting of Change Number 458,revising Unit 2 Amend 127 & Unit 3 Amend 116 Changing TS 3.9.4 & 3.9.5

ML20108E333
Person / Time
Site:	San Onofre
Issue date:	05/08/1996
From:	SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML20108E322	List: ML20108E319 ML20108E325 ML20108E333
References
NUDOCS 9605100176
Download: ML20108E333 (38)

Text

,

l SDC and Coolant Circulation-High Water Level 3.9.4 3.9 REFUELING OPERATIONS 3.9.4 Shutdown Cooling (SDC) and Coolant Circulation-High Water Level LC0 3.9.4 One SDC loop shall be OPERABLE and in operation.

---

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

4 1.

The required SDC loop may be removed from operation for l

s I hour per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period, provided no operations are l

permitted that would cause dilution of the Reactor Coolant System boron concentration.

l 2.

A containment spray pump may be used in place of a low I

pressure safety injection pump to provide shutdown i

cooling flow.

l APPLICABILITY:

MODE 6 with the water level 2 23 ft above the top of reactor vessel flange.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME I

1 A.

SDC loop A.1 Suspend Immediately I

requirements not operations I

met.

involving a reduction in reactor coolant boron concentration.

AND (continued) i 1

l l

I i

l SAN ONOFRE--UNIT 2 3.9-6 Amendment No. 127 9605100176 960508 PDR ADOCK 05000361 P

PDR

SDC and Coolant Circulation-High Water Level 3.9.4 ACTIONS CN!D17 70N REQUIRED ACTION COMPLETION TIME A.

(continued)

A.2 Suspend loading Immediately irradiated fuel assemblies in the Core.

AND A.3 Initiate action to Immediately satisfy SDC loop reouirements.

AND A.4 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> penetrations providing direct access from containment atmosphere to outside atmosphere.

i SURVEILLANCE REQUIREMENTS l

i SURVEILLANCE FREQUENCY i

SR 3.9.4.1 Verify one SDC loop is in operation and 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> circulating reactor coolant at a flow rate of 2 2200 gpm.

l l

l l

l f

i l

l SAN ONOFRE--UNIT 2 3.9-7 Amendment No. 127

SDC and Coolant Circulation-Lou Water Level 3.9.5 3.9-REFUELING OPERATIONS 3.9.5 Shutdown Cooling (SDC) and Coolant Circulation-Low Water Level LC0 3.9.5 Two SDC loops shall be OPERABLE, and one SDC loop shall be in operation.

---

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

A containment spray pump may be used in place of a low pressure safety injection pump to provide shutdown cooling flow.

APPLICABILITY:

MODE 6 with the water level < 23 ft above the top of reactor vessel flange.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

One SDC loop A.1 Initiate action to Immediately inoperable.

restore SDC loop to OPERABLE status.

0_B A.2 Initiate actions to Immediately establish a 23 ft of water above the top of reactor vessel flange.

B.

No SDC loop OPERABLE B.1 Suspend operations Immediately or in operation.

involving a reduction in reactor coolant boron concentration.

AND (continued)

I SAN ONOFRE--UNIT 2 3.9-8 Amendment No. 127

1 SDC and Coolant Circulation-Lou Water Level 3.9.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME B.

(continued)

B.2 Initiate action to Immediately restore one SDC loop to OPERABLE status and to operation.

AND B.3 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> penetrations providing direct-access from containment

{

atmosphere to outside atmosphere.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.9.5.1 Verify required SDC loops are OPERABLE 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and one SDC-loop is in operation and circulating reactor coolant at a flow rate of a 2200 gpm.

I I

1 SAN ON0FRE--UNIT 2 3.9-9 Amendment No. 127

NPF-10/15-458 ATTACHMENT "B" EXISTING SPECIFICATIONS UNIT 3 i

SDC and Coolant Circulation-High Water Level 3.9.4 3.9 REFUELING OPERATIONS 3.9.4 Shutdown Cooling (SDC) and Coolant Circulation-High Water Level LC0 3.9.4 One SDC loop shall be OPERABLE and in operation.

---

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

1.

The required SDC loop may be removed from operation for s 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> per 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period, provided no operations are permitted that would cause dilution of the Reactor Coolant System boron concentration.

2.

A containment spray pump may be used in place of a low pressure safety injection pump to provide shutdown cooling flow.

APPLICABILITY:

MODE 6 with the water level 2 23 ft above the top of reactor vessel flange.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

SDC loop A.1 Suspend Immediately requirements not operations

met, involving a reduction in reactor coolant boron concentration.

AND (continued) 1 i

l SAN ON0FRE--UNIT 3 3.9-6 Amendment No.

116 l

SDC and Coolant Circulation--High Water Level 3.9.4 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME l

A.

(continued)

A.2 Suspend loading Immediately irradiated fuel assemblies in the Core.

AND A.3 Initiate action to Immediately satisfy SDC loop requirements.

AND A.4 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> penetrations providing direct access from containment atmosphere to outside atmosphere.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.9.4.1 Verify one SDC loop is in operation and 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> circulating reactor coolant at a flow rate of a 2200 gpm.

4 SAN ON0FRE--UNIT 3 3.9-7 Amendment No.

116 l

l

i SDC and Coolant Circulation-Low Water Level 3.9.5 3.9 REFUELING OPERATIONS 3.9.5 Shutdown Cooling (SDC) and Coolant Circulation-Low Water Level LC0 3.9.5 Two SDC loops shall be OPERABLE, and one SDC loop shall be in operation.

---

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

A containment spray pump may be used in place of a low pressure safety injection pump to provide shutdown cooling flow.

APPLICABILITY:

MODE 6 with the water level < 23 ft above the top of reactor vessel flange.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

One SDC loop A.1 Initiate action to Immediately inoperable.

restore SDC loop to OPERABLE status.

OB A.2 Initiate actions to Immediately establish 2 23 ft of water above the top of reactor vessel flange.

l l

B.

No SDC loop OPERABLE B.1 Suspend operations Immediately or in operation.

involving a reduction in reactor coolant boron concentration.

AND (continued)

SAN ON0FRE--UNIT 3 3.9-8 Amendment No.

116 l

i

SDC and Coolant Circulation-Loc Water Level 3.9.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME B.

(continued)

B.2 Initiate action to Immediately restore one SDC loop to OPERABLE status and to operation.

AND B.3 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> penetrations providing direct access from containment atmosphere to outside atmosphere.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.9.5.1 Verify required SDC loops are OPERABLE 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and one SDC loop is in operation and circulating reactor coolant at a flow rate of 2 2200 gpm.

SAN ON0FRE--UNIT 3 3.9-9 Amendment No.

116

NPF-10/15-458 l

l l

ATTACHMENT "C" REVISED SPECIFICATIONS UNIT 2 i

I j

SDC and Coolant Circulation-High Water Level 3.9.4 3.9 REFUELING OPERATIONS 3.9.4 Shutdown Cooling (SDC) and Coolant Circulation-High Water Level LC0 3.9.4 One SDC loop shall be OPERABLE and in operation.

---

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

Wi th7 t hEEUppsg'u i fe d"SDC "I ob p*nihT bTridiBVsd "f F6e" jiji dsTit rudthf6WEmsiidif f6nif t h6TfEidt'6T6 Vessel.liths req foFT4 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> per 8-hour period, provided? ne operction:

are permitted that would ccuse dilutica of the ccctor a

Coc1:nt Sy: tem beren concentretien.

a' Th6 maximum RCS temperature ^ is^ maint'ain'ed Y 140*F!

b.

No operations are permitted that would cause a,redu'ction of the RCS boron concentration. '"

'~"

' "'" ~ ' '

c. "The capability to close the containment ~ penetrations

'with' direct access to the outside atmosphere within the calculated time to boil is maintained'

" ' ^ ' ' ~ ~ ~ ' ' ' ~ ~

f d.' The reactor cavity water level is maintained T20 ' feet above the top of the reactor pressure vessel flange, or;

^'

for core alterations, a 23 feet above the top"of the "

reactor pressure vessel flange.

^'

---

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

A containment spray pump may be used in place of a low pressure safety injection pump Thief thdPf6MbbthyshutdoWH

._:_::f:il66p=isto provide shutdoGK"6661 Thy

• fib 77 ~~"

cE61th.: =

APPLICABILITY:

MODE 6 with the water level a N 20 ft above the top of the reactor vessel flange.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

SDC loop requirements A.1 Suspend operations Immediately not met.

involving a reduction in reactor coolant boron concentration.

AND (continued)

SAN ONOFRE--UNIT 2 3.9-6 Amendment No. K4

SDC and Coolant Circulation-High Water Level 3.9.4 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

(continued)

A.2 Suspend loading Immediately irradiated fuel assemblies in the Core.

AND A.3 Initiate action to Immediately satisfy SDC loop requirements.

AND A.4 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> penetrations providing direct access from containment atmosphere to outside atmosphere.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.9.4.1 Verify one SDC loop is in operation and 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> circulating reactor coolant at a flow rate of 2 2200 gpm.

SAN ON0FRE--UNIT 2 3.9-7 Amendment No. 427

SDC and Coolant Circulation-Low Water Level 3.9.5 3.9 REFUELING OPERATIONS 3.9.5 Shutdown Cooling (SDC) and Coolant Circulation-Low Water Level LC0 3.9.5 Two SDC loops shall be OPERABLE, and one SDC loop shall be in operation.

---

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

A containment spray pump may be used in p, lace of a low pressure safety injection pump KiithirviribbthBhutddiM

$N__M___91lNP.jjto provide shutdown E661ind'_fl6E""'~~"'"__~*

'6Y.a ww Oni31bopidf3hstdoWHTEo61 t hiEshs l l? bd10PERABLEisWd ?6p"iFsti &y

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' ) '" containment' spray pump,'and,the associated high preis0'fs 5

'~The' Shutdown Codlingispstem fs^' operating"using:'the safety ' injection, pump and the low pressure safety'^ ^"~^ ~"

injection pump are OPERABLE'and at ambient tempera'tnrei i

'available for injection from the RWST.f ' "' "

~ " * ~ '

")]Q'Thi!RWSTrddhtit hRtheNol nMEMfNatiWr64U f fddit67Fhi'is 6

.t.hsile,V_elit,e,,3.,20?fm - Esl,ioV.m,lth.eWssst6.mm.ess.mmm.,and..ef eef e

niv 61sfl

. mm;. =..

,w 4-mmm.mm o m.

a)a? !Thb.n? sis _6dii.,t'6'd.sEmdFsbH.E9..?DiEisli_Gh6~ F,s,t6fI.ma. ERA.BLEi.

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isIOP n

a

~

n

._n

$1]ThQstpytsmpbfatutsgf$hsiSDC]Q{dm]Mnisjj{sjjiid less,rthang1 _20 W-u.

APPLICABILITY:

MODE 6 with the water level < 24 20 ft above the top of reactor vessel flange.

SAN ON0FRE--UNIT 2 3.9-8 AMENDMENT NO. 4W

SDC and Coolant Circulation-Lou Water Level 3.9.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

One SDC loop A.1 Initiate action to Immediately inoperable.

restore SDC loop to OPERABLE status.

(Applibibibi;tCihitihl conditiohfofstwofshut'dowri OR

~

E6oling"ilo6p~'s!;0PERABLE) "

^ ~

~ " " ~ "

A.2 Initiate actions to Immediately establish t M 20 ft of water above tiie top of reactor vessel flange.

B%i0n'eTSDCylo6p?operablei Bil' IInitiatelictibnMtd

^ "igPe'stablistfM20ffest Imm;e'distil "

"" ^" ~ ' ' ' " "y

-mam.W U

20 ffeet?df' "

Wafesabovel?the*'" "

6fiWhteF " '"'"~~

WiactsyvesselffMge, a.nd;any4.ofB he[8 _ t gegu.iregen3singg.ye

'(ApplWabli!?tdiinitilhl j

' conditions?6fIbnefshutdoWri bdolinsilo$10PERABLElend" bperating!with~~ ~~"*"~~

n qdir_einentsiit1.m.-)

re 28

.mm

_. m 1

Bq. No SDC loop OPERABLE BC.1 Suspend operations Immediately or in operation.

involving a reduction in reactor coolant boron concentration.

AND (continued)

SAN ON0FRE--UNIT 2 3.9-9 AMENDMENT N0. W

4 SDC and Coolant Circulation-Lou Water Level 3.9.5 i

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME BC.

(continued).

80.2 Initiate action to Immediately

~

restore one SDC loop i

to OPERABLE status j

and to operation.

l l

AND 4

j BC.3 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />

~

penetrations providing direct i

access from containment atmosphere to outside atmosphere.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.9.5.1 Verify required SDC loops are OPERABLE 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and one SDC loop is in operation and circulating reactor coolant at a flow rate of 2 2200 gpm.

1 l

l SAN ON0FRE--UNIT 2 3.9-9a AMENDMENT N0. 127

. i

NPF-10/15-458 i

ATTACHMENT "D" REVISED SPECIFICATIONS UNIT 3 l

SDC and Coolant Circulation-High Water Level 3.9.4 3.9 REFUELING OPERATIONS 3.9.4 Shutdown Cooling (SDC) and Coolant Circulation-High Water Level LC0 3.9.4 One SDC loop shall be OPERABLE and in operation.

---

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

Wi thi t hEiiipdfTgdi deHtFO^c tiTrelFEEVidsf F6hiith'sEFEsctif Wsselfths reliGiFed"SDC"lo6p*msy* tis *reeblTed"ffoliinpbfsfion foFT4 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />? per 8-hour period, provided? nc Operation:

are pennitted that would cause dilutien cf the Reacter Ccolant Syste ; bcron concent+M4+nr a.

The maximum'RCS temperatsre'is maintained Y 140'Ft b.

No operations are permitted that would cause a,redQction

~

^ of the RCS boron concentration.

' " ' ' ~ ' ^ ' ^ ^ ^ ' *

c. ' The capability'to close the containment' penetrations with' direct access to the outside atmosphere within the calculated time to boil is maintained. ' '~^"~* ' ' ~"

d.

'The reactor cavity water level is maintaTndd i'20ffeet

• ' ~

above the top'of the reactor pressure vessel' flange;3or,'

for core alterations, l'23 feet above the to " of,the"^' ~

Teactor' pressure vessel flange'.^"~ ' ~ ~~ '

~^~"p"^'

---

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

A containment spray pump may be used in place of a low pressure safety injection pump inibithetfor3bbthishdtd6Wri t

t _t=gy=: _[gt o p ro v i d e s h u t d osin"_'E61il inj*fl esi."_ _ _~ ^'~'~

c661fii bb APPLICABILITY:

MODE 6 with the water level 2 23 20 ft above the top of the

~'

reactor vessel flange.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME 1

A.

SDC loop requirements A.1 Suspend operations Immediately not met.

involving a reduction in reactor coolant boron concentration.

AND (continued)

SAN ON0FRE--UNIT 3 3.9-6 AMENDMENT NO. 4M

SDC and Coolant Circulation-High Water Level 3.9.4 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

(continued)

A.2 Suspend loading Immediately irradiated fuel assemblies in the Core.

AND A.3 Initiate action to Immediately satisfy SDC loop requi rements.

AND A.4 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> penetrations providing direct access from containment atmosphere to outside atmosphere.

SURVEILLANCE REQUIREMENTS-SURVEILLANCE FREQUENCY

-SR 3.9.4.1 Verify one SDC loop is in operation and 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> circulating reactor coolant at a flow rate of 2 2200 gpm.

SAN ON0FRE--UNIT 3 3.9-7 AMENDMENT N0. 446

SDC and Coolant Circulation-Low Water Level 3.9.5 3.9 REFUELING OPERATIONS 3.9.5 Shutdown Cooling (SDC) and Coolant Circulation-Low Water Level i

LCO 3.9.5 Two SDC loops shall be OPERABLE, and one SDC loop shall be in operation.

---

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

A containment spray pump may be used in place of a low pressure safety injection pump ihTeithihi6Eb'6thYih'0Td6Gh coolingildbpisto provide shutdoWh"_enelihy"_fibC "___"___*

'rtr=_ :::_ 0_____....__------

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166 lis n~a-ra-

.-na nl

' ) ' containment spray pump, and the ' associated high prsss~urs 5

' The Shutdown Cooling ~ system ^is' operating'~using"the safety' injection pump' and the low pressure safety'""~~*

injection pump are OPERABLE and at ambient temperature l 4

available for injection from the RWST. '* ~'

^ " ' ^ ' ^ ~ ' ~ ^ '

>~

r l

4 6) The RWST'containsthe' volume of water' required to raise thq lpvel to 20 f_eet_above 3hejea,ctor vessel, flange. ^

4 s

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w anma

+u APPLICABILITY:

MODE 6 with the water level < 33 20 ft above the top of

~

reactor vessel flange.

SAN ON0FRE--UNIT 3 3.9-8 AMENDMENT N0. 4M i

SDC and Coolant Circulation-Lou Water Level 3.9.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

One SDC loop A.1 Initiate action to Immediately inoperable.

restore SDC loop to OPERABLE status.

(AppliablWitbMni~tihl conditions?ofitW63h6tdoWri OR

.b6olingsl_6opsi.O, PERABLE[~~

-m.

e.-

' ~'*^

A.2 Initiate actions to Immediately establish a M 20 ft of water above the top of reactor vessel flange.

BIR0nslSDCfL66p10pei#bTe?

B.1 ~ > Initiate actions to ImmWdiatel

"""~'"^ y^

" ~1sss$thinf20ifee Wof-

" establish > 20 ft of Watsrlaboyeiths~""'"

wa t e r ' ' " ' ' ' ^ ' ~ ' ~~"

Fesct'6tNssielsflin s

""~

pndj(any3Mthe[8[g"'

['911remppsinot[ met (ApplichblWEtbEiriitihl condit'i6nstof76netshutdoWn b64) ins!ilcapiOPERABLE3isnd" bperatirfyisi th"^* ~ " "'"'*"

Trehbirements1118).

94aho;+Mswumv.vh:+," '

e BC. No SDC loop OPERABLE 80.1 Suspend operations Immediately or in operation.

involving a reduction in reactor coolant boron concentration.

AND (continued)

I SAN ONOFRE--UNIT 3 3.9-9 AMENDMENT N0. M6

SDC and Coolant Circulation-Lou Water Level 3.9.5 ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME BC.2 Initiate action to Immediately restore one SDC loop to OPERABLE status and to operation.

AND BC.3 Close all containment 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> penetrations providing direct access from containment atmosphere to outside atmosphere.

1 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.9.5.1 Verify required SDC loops are OPERABLE 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and one SDC loop is in operation and circulating reactor coolant at a flow rate of 2 2200 gpm.

SAN ONOFRE--UNIT 3 3.9-9a AMENDMENT NO. 146

I 1

l NPF-10/15-458 4

i 1

1 4

d i

4 1

I i

1 i

1-ATTACHMENT "E" i

i FIGURE 1 FROM CALCULATION NO. SUPPLEMENT A.N-0220-029 RCS HEATUP RATE AS A' FUNCTION OF TIME 2

l AFTER SHUTDOWN AND CAVITY LEVEL N

\\

\\

.'ss

\\.

As A

N

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~s

\\

N

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.._.~,,m_,,,

CALCULATION SHEET i

• c" "o' PREW. CCN NO. N "4-FAGEM OF 32.

Project or DCP/MMP SONGS 2/3 Calc. No.Suco A N-0220029_

CCN COWERSION:

i ccN No. CCN -

SubjectRCS Heatuo Folidwino I a=? of Shutdown Coolina Sheet No. A-28 nev onioiMATom DATE me DATE nev onioiNAton DATE int DATE n

A W. G. Flournoy 3/25/M J. Boyajian 3/25/M /\\

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i ATTACHMENT "F" Technical Specification Bases for Units 2 and 3

SDC and Coolant Circulation-High Water Level B 3.9.4 BASES (Continued)

APPLICABLE If the reactor coolant temperature is not maintained below SAFETY ANALYSES 200*F, boiling of the reactor coolant could result.

This could lead to inadequate cooling of the reactor fuel due to a resulting loss of coolant in the reactor vessel.

Additionally, boiling of the reactor coolant could lead to a reduction in boron concentration in the coolant due to the boron plating out on components near the areas of the boiling activity, and because of the possible addition of water to the reactor vessel with a lower boron concentration than is required to keep the reactor subcritical.

The loss of reactor coolant and the reduction of boron concentration in the reactor coolant would eventually challenge the integrity of the fuel cladding, which is a fission product barrier. One t+em.lbbli?of the SDC System is required to be operational in MODE 6,Nith the water level 2 33 20 ft above the top of the reactor vessel flange, to prevent this challenge. The LC0 does permit de-energizing of the SDC pump for short durations under the condition that the boron concentration is not diluted.

This conditional de-energizing of the SDC pump does not result in a challenge to the fission product barrier.

SDC and Coolant Circulation-High Water Level satisfies Criterion 3 of the NRC Policy Statement.

LC0 Only one SDC loop is required for decay heat removal in MODE 6, with water level 2 33 20 ft above the top of the reactor vessel flange. Only ohE SDC loop is required because the volume of water above the reactor vessel flange provides backup decay heat removal capability. At least one SDC loop must be in operation to provide:

a.

Removal of decay heat; b.

Mixing of borated coolant to minimize the possibility of a criticality; and c.

Indication of reactor coolant temperature.

An OPERABLE SDC loop includes an SDC pump, a heat exchanger, valves, piping, instruments, and controls to ensure an OPERABLE flow path and to determine the low end temperature.

(continued)

SAN ON0FRE--UNIT 2 B 3.9-17 Amendment No. 4W

SDC and Coolant Circulation-High Water Level B 3.9.4 BASES LC0 The flow path starts in one of the RCS hot legs and is (continued) returned to the RCS cold legs.

The LC0 is modified by two Notes. Withilthi[UppdrTyfiidd stiddtWeiremoVsdifromitheTresctorNesssliN6te"1*h116sli the

'fe(Jifs3"6p'entilig"SDC"ldbii~t'o"bTfsmoVed"from service for up to 42 hours4.861111e-4 days <br />0.0117 hours <br />6.944444e-5 weeks <br />1.5981e-5 months <br /> in each 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period, provided thati ne operati5n: crE pennitted that wculd c::: dilutlF3f the Reacter Ccclant Syster beren concentratien.

ar'""The maximum RCS" temp'erature"is' maintained 'i(140'F1

b. < No operations are perwitted that would cause a"^ ~

~ ' ~ ~

reduction of the' RCS boron concentration.~~'"~

c '.

'The capability to close the containment'penst'rati~ons

'~'"with direct access'to the outside temperature within the calculated time to boil.is maintained.^'

'~ ^

d S Theireactor cavity water level is'mairitained *i 204 feet

' ~ ' ^ above the, top of the reactor pressure vessel flange,

or,' for core alterations.,2 23' feet'above the top of

.the reactor pres _sure vessel, flange: ' '

' " ~ ' ' "

This permits operations such as core mapping or alterations in the vicinity of the reactor vessel hot leg nozzles, and RCS to SDC isolation valve testingjT3WdMhi'6r,gifilifsiUWjY6f LPSIIsystemTcbmponEnts. During this'T2$61IF jisFilid7decsy" hiat~is"FbiiidVE'd bi'nstural convection t6'the large mass of water in the refueling canal.

Note 2 allows Operations to use a containment spray pump in place of a low pressure safety injection pump to provide shutdown cooling flow.

APPLICABILITY One SDC loop must be in operation in MODE 6, with the water level a M 20 ft above the top of the reactor vessel flange, to provide dscay heat removal.

The 23 ft level w : clected because it corrc: pend; tc the 23 ft requirc cat c:tablished fer fuel =cvement in LCO 3.9.5, " Refueling S tcr Level."

Requirements for the SDC System in other MODES are covered by LCOs in Section 3.4, Reactor Coolant System (RCS), and 1

Section 3.5, Emergency Core Cooling Systems (ECCS).

SDC

)

loop requirements in MODE 6, with the water level < N 20 ft

{

above the top of the reactor vessel flange, are located *in LC0 3.9.5, " Shutdown Cooling (SDC) and Coolant Circulation-Low Water Level."

(continued)

SAN ON0FRE--UNIT 2 8 3.9-18 Amendment No. 4N

SDC and Coolant Circulation-High Water Level B 3.9.4 BASES ACTIONS SDC loop requirements are met by having one SDC loop OPERABLE and in operation, except as permitted in the Note to the LCO.

A.1 If SDC loop requirements are not met, there will be no forced circulation to provide mixing to establish uniform boron concentrations.

Reduced boron concentrations can occur through the addition of water with a lower boron concentration than that contained in the RCS.

Therefore, actions that reduce boron concentration shall be suspended immediately.

A.2 If SDC loop requirements are not met, actions shall be taken immediately to suspend loading irradiated fuel assemblies in the core. With no forced circulation cooling, decay heat removal from the core occurs by natural convection to the heat sink provided by the water above the core. A minimum refueling water level of M20 ft above the reactor vessel flange provides an adequate ~ivailable heat sink. Suspending any operation that would increase the decay heat load, such as loading a fuel assembly, is a prudent action under this condition.

A.3 If SDC loop requirements are not met, actions shall be initiated and continued in order to satisfy SDC loop requirements.

l A.4 l

If SDC loop requirements are not met, all containment penetrations to the outside atmosphere must be closed to prevent fission products, if released by a loss of decay heat event, from escaping the containment building. The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Completion Time allows fixing most SDC problems without incurring the additional action of violating the l

containment atmosphere.

j (continued)

SAN ON0FRE--UNIT 2 B 3.9-19 Amendment No. W

SDC and Coolant Circulation-Low Water Level B 3.9.5 l

BASES APPLICABLE If the reactor coolant temperature is not maintained below SAFETY ANALYSES 200'F, boiling of the reactor coolant could result.

This could lead to inadequate cooling of the reactor fuel due to the resulting loss of coolant in the reactor vessel.

Additionally, boiling of the reactor coolant could lead to a reduction in boron concentration in the coolant due to the boron plating out on components near the areas of the boiling activity, and because of the possible addition of water to the reactor vessel with a lower boron concentration than is required to keep the reactor subcritical.

The loss of reactor coolant and the reduction of-boron concentrati u in the reactor coolant would eventually challenge the integrity of the fuel cladding, which is a fission product barrier. Two t+a4*s T66Kof the SDC System are required to l

be OPERABLE, and one t+aw loopjls required to be in operation in MODE 6, with th'E' water level < M 20 ft above the top of the reactor vessel flange, to prevent"this challenge.

l With thd reactor ' vessel' head" removed ind 12' feet ^"of #stEf above the reactor vessel flange and all the specified ^ '"'

requirements met, a heat sink is available for core coolin and a method is available to restore the reactor cavity g level to 20 feet' above the reactor vessel flange.

therefore, in the event.of a failure of the operating shutdown cooling loop, adequate time is provided to initiats emergency procedures to cool the core. '

~

" ' ~ ~ ' ~ ' ^ " ' ~ ~ ^

SDC and Coolant Circulation-Low Water Level satisfies Criterion 3 of the NRC Policy Statement.

LC0 In MODE 6, with the water level < N20 ft above the top of the reactor vessel flange, both SDC 160ps must be OPERABLE.

Additionally, one loop of the SDC System must be in operation in order to provide:

a.

Removal of decay heat; b.

Mixing of borated coolant to minimize the possibility l

of a criticality; and c.

Indication of reactor coolant temperature.

(continued)

SAN ON0FRE--UNIT 2 B 3.9-22 Amendment No. 4N

l SDC and Coolant Circulation-Low Water Level B 3.9.5 BASES (continued)

LC0 An OPERABLE SDC loop consists of an SDC pump, a heat (continued) exchanger, valves, piping, instruments, and controls to ensure an OPERABLE flow path and to determine the low end temperature.

The flow path starts in one of the RCS hot legs and is returned to the RCS cold legs.

This LC0 is modified by the Note that allows Operations to use a containment spray pump in place of a low pressure safety injection pump to provide shutdown cooling flow.

55

,1U.I'.The" reactor'ha,s' been, 'sh' tdo,wn^ for"at,leajt* 6(days.'

u 2)' " Th'e'~ilater level above the" reactor've'ssel: flange,is12 feet op,gyeate r,. " '" ^ '" ' ~"^ ' " ~ ~ ~ '~ "~ "'

'* ~ "' "

^

3) ' The' a~^ssociate^d lo6p^'df Salt" Water Coolin'g'(SWC)is

OPERA,BLE and oper,atinge' 4)'~^iThe associated Component' Cooling Water'(CCW) pump ^and i

the CCW swing pump are OPERABLE, and the associated' '

CCW loop is OPERABLE and operatingi^~'""~"

" ^ ' ' ' ^ ~ ^

5)

The Shutdown Cooling' system is' operating using the

' ' containment spray pump, and the associated.high '~"

pressure safety injection pump and the low press' re u

safety injection pump are OPERABLE and at ambient"

, temperature, availab,le for injection, from, t,he,RWST:

6) " The' RWST contains 'the volume'of water ' required'to

~ ~ ' raise the,, l,,e,v, e.l' to, 20, f,eet_' above.t,he re.act..or vesse,l

~m f)

7) E The' associated' Emergency Diesel' Gen,erator~ is^ OperableJ 8)' The water' temperature 'of the'SDC sy' stem is^ maintained

' ~ ~ ' ' ' "

• ' " ' ' ' ' ' ^ ' ' " ' ^ ' "

l e.ss t.han 120* f '"'~

~ ~.

APPLICABILITY Two SDC loops are required to be OPERABLE, and one SDC loop i

must be in operation in MODE 6, with the water level

< 2320 ft above the top of the reactor vessel flange, to prov'ide decay heat removal. Requirements for the SDC System

)

in other MODES are covered by LCOs in Section 3.4, Reactor j

I I

l l

(continued)

SAN ON0FRE--UNIT 2 B 3.9-23 Amendment No. 427 1

1 1

SDC and Coolant Circulation-Low Water Level B 3.9.5 BASES (continued)

APPLICABILITY Coolant System. MODE 6 requirements, with a water level (continued) 2 M20 ft above the reactor vessel flange, are covered in LC0 3'.'9.4, " Shutdown Cooling and Coolant Circulation-High Water Level."

ACTIONS A.1 and A.2

$p{ty61SDCj]65ppfiyMbph' fab]jfshdj(ijf one SDC loop 4+

incpera!!!3becomes Ainoperable, actions shall be immediately initiated 'ind"2Bufihdid"UWfi~1 the SDC loop is restored to OPERABLE status and to operation, or until 2 M 20 ft of water level is established above the reactor vessel flange.

When the water level is established at a M20 ft above the reactor vessel flange, the Applicability will change to that of LC0 3.9.4, " Shutdown Cooling and Coolant Circulation-High Water Level," and only one SDC loop is required to be OPERABLE and in operation. An immediate Completion Time is necessary for an operator to initiate corrective actions.

B.1 When'one' loop of the"SDC is operable ^With' requirementsl-8 t

satisfied and the SDC, loop becomes inoperable or any of the 8 requirements are not met, actions 'shall be immediately ^~^"

initiated to establish a water level > 20 feet above the reactor flange. When the water level is established at > 20 feet above the reactor vessel flange, the applicability will change to that of LCO 3.9.4', " Shutdown Cooling and Coolant "

l Circulation-High Water Level," and only one SDC loop is' ~

required to be OPERABLE and in operation. An immediate Completion Time is necessary for an operator to initiate corrective actions. '~

' '^ ' ' ' ^ '~' '

' ' ~ ' ' ' ' ^ ' '

BC.1 If no SDC loop is in operation or no SDC loops are OPERABLE, there will be no forced circulation to provide mixing to establish uniform boron concentrations.

Reduced boron concentrations can occur by the addition of water with lower i

boron concentration than that contained in the RCS.

l Therefore, actions that reduce boron concentration shall be suspended immediately.

(continued)

SAN ON0FRE--UNIT 2 B 3.9-24 Amendment No. 4 Git

SDC and Coolant Circulation-Low Water Level B 3.9.5 BASES ACTIONS BC.2 (continued)

If no SDC loop is in operation or no SDC loops are OPERABLE, actions shall be initiated immediately and continued without interruption to restore one SDC loop to OPERABLE status and operation. Since the unit is in Conditions A and B concurrently, the restoration of two OPERABLE SDC loops and one operating SDC loop should be accomplished expeditiously.

BC.3 If SDC loops requirements are not met, all containment penetrations to the outside atmosphere must be closed to prevent fission products, if released by a loss of decay heat event, from escaping the containment building.

The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Completion Time allows fixing most SDC problems without incurring the additional action of violating the containment atmosphere.

SURVEILLANCE SR 3.9.5.1 REQUIREMENTS This Surveillance demonstrates that one SDC loop is operating and circulating reactor coolant.

The flow rate is determined by the flow rate necessary to provide sufficient decay heat removal capability and to prevent thermal and boron stratification in the core.

In addition, this Surveillance demonstrates that the other SDC loop is OPERABLE.

In addition, during operation of the SDC loop with the water level in the vicinity of the reactor vessel nozzles, the SDC loop flow rate determination must also consider the SDC pump suction requirements.

The Frequency of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is sufficient, considering the flow, temperature, pump control, and alarm indications available to the operator to monitor the SDC System in the control room.

l Verification that the required loops are OPERABLE and in operation ensures that loops can be placed in operation as needed, to maintain decay heat and retain forced circulation. The Frequency of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is considered reasonable, since other administrative controls are available and have proven to be acceptable by operating experience.

(continued)

SAN ON0FRE--UNIT 2 B 3.9-24a Amendment No. 4M

SDC and Coolant Circulation-High Water Level B 3.9.4 BASES (continued)

APPLICABLE If the reactor coolant temperature is not maintained below SAFETY ANALYSES 200*F, boiling of the reactor coolant could result.

This could lead to inadequate cooling of the reactor fuel due to a resulting loss of coolant in the reactor vessel.

Additionally, boiling of the reactor coolant could lead to a reduction in boron concentration in the coolant due to the boron plating out on components near the areas of the boiling activity, and because of the possible addition of water to the reactor vessel with a lower boron concentration than is required to keep the reactor subcritical.

The loss of reactor coolant and the reduction of boron concentration in the reactor-coolant would eventually challenge the integrity of the fuel cladding, which is a fission product barrier. One t+ain lob operationalinMODE67"y?oftheSDCSystemisrequiredtobe dith the water level 2 M20 ft above the top of the reactor vessel flange, to prevent"this challenge.

The LC0 does permit de-energizing of the SDC pump for short durations under the condition that the boron concentration is not diluted. This conditional de-energizing of the SDC pump does not result in a challenge to the fission product barrier.

SDC and Coolant Circulation-High Water Level satisfies Criterion 3 of the NRC Policy Statement.

LC0 Only one SDC loop is required for decay heat removal in MODE 6, with water level 2 N20. ft above the top of the reactor vessel flange. Only bhe SDC loop is required because the volume of water above the reactor vessel flange provides backu) decay heat removal capability. At least one SDC loop must 3e in operation to provide:

a.

Removal of decay heat; b.

Mixing of borated coolant to minimize the possibility of a criticality; and c.

Indication of reactor coolant temperature.

An OPERABLE SDC loop includes an SDC pump, a heat exchanger, valves, piping, instruments, and controls to ensure an OPERABLE flow path and to determine the low end temperature.

(continued)

SAN ON0FRE--UNIT 3 B 3.9-17 Amendment No. 4M

SDC and Coolant Circulation-High Water Level B 3.9.4 BASES LCO The flow path starts in one of the RCS hot legs and is (continued) returned to the RCS cold legs.

The LC0 is modified by two Notes. WithithhE6jijiBHibids strUtt'UfeYrdmoVpdiff6mithhW6sttbHVesselM61e ^1"sil6N5' the F

FW WW SDC"166]i"te*bE7sleid*fromservicefor up to 42 houri in each 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> period, provided thuti ne operati5n arE per:"itted that ;;culd cause dilutiEE*5f the Reacter Ccclant Syste-beren concentration.

a. ~The' maximum RCS temperature is, maintained "s' '140'FJ b.

No operations are pennitted that would cause a '

reduction of the RCS boron concentration. '

The capability to close the containment pen'etrations c.

with direct' access to the outside temperature within the calculated time to boil,is maintainedi

~

^~

d.1 The reactor cavity water level is maintained ^i 20' feet above the or, for co, top of the reactor pressure vessel flange.

re alterations the reactor pressure vess,el flange.,a 23 feet above the top o This permits operations such as core mapping or alterations in the vicinity of the reactor vessel hot leg nozzles, and RCStoSDCisolationvalvetestingH's%h;dEihsdrVi 6

1.PSII5y5t'siniboiiipbiishti. During thi T2theiFjisFibd,"'dsca W E " W F u ed"by^iiifural convection tB*the large mass of water in the refueling canal.

Note 2 allows Operations to use a containment spray pump in place of a low pressure safety injection pump to provide shutdown cooling flow.

APPLICABILITY One SDC loop must be in operation in MODE 6, with the water level 2 M20 ft above the top of the reactor vessel flange, to provide" decay heat removal.

The 23 ft level :::: ;clected becau;c it correspond; to the 23 ft requirement c;tablished for fuel mcyc=cnt in LC0 3.9.5, " Refueling Water Lc,e4 r"-

Requirements for the SDC System in other MODES are covered by LCOs in Section 3.4, Reactor Coolant System (RCS), and

(

Section 3.5, Emergency Core Cooling Systems (ECCS).

SDC l

loop requirements in MODE 6, with the water level < M20 ft above the top of the reactor vessel flange, are located ^in l

LC0 3.9.5, " Shutdown Cooling (SDC) and Coolant Circulation-Low Water Level."

i I

1 (continued)

SAN ON0FRE--UNIT 3 B 3.9-18 Amendment No. 446

i SDC and Coolant Circulation-High Water Level B 3.9.4 4

BASES ACTIONS SDC loop requirements are met by having one SDC loop OPERABLE and in operation, except as permitted in the Note to the LCO.

A.1 If SDC loop requirements are not met, there will be no forced circulation to provide mixing to establish uniform boron concentrations.

Reduced boron concentrations can occur through the addition of water with a lower boron concentration than that contained in the RCS.

Therefore, actions that reduce boron concentration shall be suspended immediately.

A.2 If SDC loop requirements are not met, actions shall be taken immediately to suspend loadir.g irradiated fuel assemblies in the core. With no forced circulation cooling, decay heat removal from the core occurs by natural convection to the heat sink provided by the water above the core. A minimum refueling water level of M20 ft above the reactor vessel flange provides an adequate"svailable heat sink.

Suspending any operation that would increase the decay heat load, such as loading a fuel assembly, is a prudent action under this condition.

A.3 If SDC loop requirements are not met, actions shall be initiated and continued in order to satisfy SDC loop requirements.

A.4 If SDC loop requirements are not met, all containment penetrations to the outside atmosphere must be closed to prevent fission products, if released by a loss of decay heat event, from escaping the containment building.

The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Completion Time allows fixing most SDC problems without incurring the additional action of violating the containment atmosphere.

(continued)

SAN ONOFRE--UNIT 3 8 3.9-19 Amendment No. 446

SDC and Coolant Circulation-Low Water Level B 3.9.5 BASES APPLICABLE If the reactor coolant temperature is not maintained below i

SAFETY ANALYSES 200*F, boiling of the reactor coolant could result. This could lead to inadequate cooling of the reactor fuel due to the resulting loss of coolant in the reactor vessel.

Additionally, boiling of the reactor coolant could lead to a reduction in boron concentration in the coolant due to the boron plating out on components near the areas of the boiling activity, and because of the possible addition of water to the reactor vessel with a lower boron concentration than is required to keep the reactor subcritical.

The loss of reactor coolant and the reduction of boron concentration in the reactor coolant would eventually challenge the integrity of the fuel cladding, which is a fission product barrier. Two t-r+is 16bpi of the SDC System are required te be OPERABLE, and one tr-&in Toby is required to be in operation in MODE 6, with thTwater level < M20 ft above the top of the reactor vessel flange, to prevent this challenge.

With the reactor vessel head' removed and 12 feet of wat'er above the reactor vessel flange and all the specified

requirements met, a heat sink is available for core cooling and a method is available to restore the reactor cavity"

level to 20 feet above'the reactor,vesse1 31ange.:'"

Therefore, in the event of a failure of W, operating shutdown cooling loop, adequate time i

einergency procedures,to cool the core (q' greided to initiate

" ' ~ " ^ ' ' ' * " ~ ' ~ ~ ~ ' '

SDC and Coolant Circulation-Low Water Le. u satisfies Criterion 3 of the NRC Policy Statement.

LC0 In MODE 6, with the water level < N20 ft above the top of the reactor vessel flange, both SDC 1dops must be OPERABLE.

Additionally, one loop of the SDC System must be in operation in order to provide:

a.

Removal of decay heat; b.

Mixing of borated coolant to minimize the possibility of a criticality; and c.

Indication of reactor coolant temperature.

(continued)

SAN ON0FRE--UNIT 3 B 3.9-22 Amendment No. 4%

SDC and Coolant Circulation-Lou Water Level B 3.9.5 BASES (continued)

LC0 An OPERABLE SDC loop consists of an SDC pump, a heat (continued) exchanger, valves, piping, instruments, and controls to ensure an OPERABLE flow path and to determine the low end temperature. The flow path starts in one of the RCS hot legs and is returned to the RCS cold legs.

This LC0 is modified by the. Note that allows Operations to use a containment spray pump in place of a low pressure safety injection pump to provide shutdown cooling flow.

1)a v ~hh_Rsit,t_6Ehit'Ibe3nishutd6WnTfoRntE1 East?n.n.y.5?

MT i

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V k$

3 ) " ' ThEVI556EI'stid 366p?6fWil t?WstiElC661 ih'QSygg~i:

g R38((jg gj y p a,tjpgj ~ ~ " " ~

4,._).~TTThdEddi6di k tsdlC6iiip6iidn tic 661 t hpiWiteM(CCW)Wuingaud "thECCWiswihgf pumpfare10PERABLERA#d Etheias30ciated" CCW $160"Pu siOPERA. BCEfan. ~di6P",i.. fs_t i ns.?"'"~~~~""-"

Ei x s-u-

m 5)

The Shutdown Cooling system is' operating'using the containment spray pump, and the associated high pressure safety injection pump and the low pressure safety injection pump are OPERABLE and at ambient temperature, available for injection from the RWS,T!

6)~~ The~ RWST~contains the volume'of ' water ^ required' to

~ raise the level to'20 feet above the reactor vessel fl ange.'

+. w. +s....w4 7.).,T ETh6faighiatsdiEm6[gd;hc9.i.?.Dif5:41EGEn6fitbfliR0pEfhbl~ 7.)

i s

f g / - - ' ' '

nwwO

.x.y a-9<

x..)(@

h.:dco C - @/UX(

.../.fo0$e&G/ WyAv i

8)? 'ITh'dTWitshitsmpti'atur6?dfRthi:1lSDC3syytlemjisimaihtAJHEq

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-~ 0! F.~2 W 12

'~ ~ ~ ~ " ~ ~ ~ ~

c 5

APPLICABILITY Two SDC loops are required to be OPERABLE, and one SDC loop must be in operation in MODE 6, with the water level

< 2-320 ft above the top of the reactor vessel flange, to provi~de decay heat removal.

Requirements for the SDC System in other MODES are covered by LCOs in Section 3.4, Reactor (continued)

SAN ON0FRE--UNIT 3 8 3.9-23 Amendment No. 446

SDC and Coolant Circulation-Low Water Level B 3.9.5 BASES (continued)

APPLICABILITY Coolant System. MODE 6 requirements, with a water level (continued) 2 M20 ft above the reactor vessel flange, are covered in LC0 3'.'9.4, " Shutdown Cooling and Coolant Circulation-High Water Level."

ACTIONS A.1 and A.2

@$tj6KSDCH66^ppifi?6p#@gstidMf one SDC, loop 4s incperabibbecomessinoperable, actions shall be immediately initiated INTci6htiiiGeTinti"1 the SDC loop is restored to OPERABLE status and to operation, or until 2 M20 ft of water level is established above the reactor vesiel flange.

When the water level is established at a M20 ft above the reactor vessel flange, the Applicability will change to that of LC0 3.9.4, " Shutdown Cooling and Coolant Circulation-High Water Level," and only one SDC loop is required to be OPERABLE and in operation. An immediate Completion Time is necessary for an operator to initiate corrective actions.

B.1 i

When one' loop ~of the'SDC^is operable with'requi'rements*1"8 satisfied *and the 500 loop becomes inoperable or any of the 8 requirements are not met, actions shall be immediately'"~'

initiated to' establish a water level > 20 feet above the s

reactor flange. when the water level is established at > 20 feet above the reactor vessel flange, the applicability will change to that of LC0 3,9.4, " Shutdown Cooling and Coolant"'

Circulation-High Water Level," and only one SDC loop is " '

j required to be OPERABLE and in operation. An immediate 1

Completion Timesis necessary for an operator to initiate corrective actionsi' ' '

j BC.1 1

If no SDC loop is in operation or no SDC loops are OPERABLE, I

there will be no forced circulation to provide mixing to

)

establish uniform boron concentrations.

Reduced boron concentrations can occur by the addition of water with lower boron concentration than that contained in the RCS.

Therefore, actions that reduce boron concentration shall be suspended immediately.

(continued) 1 SAN ON0FRE--UNIT 3 B 3.9-24 Amendment No. 446

._ =_ _-_____

SDC and Coolant Circulation-Low Water Level B 3.9.5 i

BASES 4

ACTIONS BC.2 (continued)

If no SDC loop is in operation or no SDC loops are OPERABLE, actions shall be initiated immediately and continued without interruption to restore one SDC loop to OPERABLE status and j

operation. Since the unit is in Conditions A and B 1

concurrently, the restoration of two OPERABLE SDC loops and one operating SDC loop should be accomplished expeditiously.

BC.3 If SDC loops requirements are not met, all containment penetrations to the outside atmosphere must be closed to arevent fission products, if released by a loss of decay l

1 eat event, from escaping the containment building. The 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Completion Time allows fixing most SDC problems l

without incurring the additional action of violating the containment atmosphere.

SURVEILLANCE SR 3.9.5.1 REQUIREMENTS j

This Surveillance demonstrates that one SDC loop is l

l operating and circulating reactor coolant.

The flow rate is determined by the flow rate necessary to. provide sufficient decay heat removal capability and to prevent thermal and t

boron stratification in the core.

In addition, this Surve'51ance demonstrates that the other SDC loop is OPERABLE.

In addition, during operation of the SDC loop with the water level in the vicinity of the reactor vessel nozzles, the SDC j

loop flow rate determination must also consider the SDC pump suction requirements. The Frequency of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is i

sufficient, considering the flow, temperature, pump control, and alarm indications available to the operator to monitor the SDC System in the control room.

4 i

i Verification that the required loops are OPERABLE and in operation ensures that loops can be placed in operation as needed, to maintain decay heat and retain forced l

circulationi The Frequency of'12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is considered i

reasonable, since other administrative controls are available and have proven to be acceptable by operating j

experience.

1 l

(continued)

SAN ON0FRE--UNIT 3 83.9-g4j Amendment No. 4M i

,