ML20094F830
| ML20094F830 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/06/1995 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML20094F791 | List: |
| References | |
| NUDOCS 9511090092 | |
| Download: ML20094F830 (25) | |
Text
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4 SITS 3.5.1 3.5 EMERGENCY CORE COOLING SYSTEMS (ECCS)
J 3.5.1 Safety Injection Tanks (SITS) i LCO 3.5.1 Four SITS shall be OPERABLE.
APPLICABILITY:
MODES 1 and 2, MODE 3 with pressurizer pressure a 715 psia.
l ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.
One SIT inoperable due A.1 Restore boron 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to boron concentration concentration to-not within limits.
within limits.
i B.
One SIT inoperable for B.1 Restore SIT to I hour reasons other than OPERABLE status.
Condition A.
C.
Required Action and C.1 Be in MODE 3.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion Time of Condition A AND or B not met.
C.2 Reduce pressurizer 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> pressure to
< 715 psia.
D.
Two or more SITS D.1 Enter LC0 3.0.3.
Immediately inoperable.
i SAN ON0FRE--UNIT 2 3.5-1 Amendment No. 02/28/95 9511090092 951106 PDR ADOCK 05000361 P
SITS B 3.5.1 BASES ACTIONS M (continued) during reflood concentrates the boron in the saturated liquid that remains in the core.
In addition, the volume of the SIT is still available for injection.
Since the boron requirements are based on the average boron concentration of the total volume of three SITS, the consequences are less severe than they would be if an SIT were not available for injection. Thus, 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> is allowed to return the boron concentration to within limits.
M If one SIT is inoperable, for a reason other than boron concentration, the SIT must be returned to OPERABLE status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
In this Condition, the required contents of three SITS cannot be assumed to reach the core during a LOCA.
Due to the severity of the consequences should a LOCA occur in these conditions, the 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> Completion Time to open the valve, remove power to the valve, or restore the proper water volume or nitrogen cover pressure ensures that prompt action will be taken to return the inoperable accumulator to OPERABLE status. The Completion Time minimizes the exposure of the plant to a LOCA in these conditions.
C.1 and C.2 If the SIT cannot be restored to OPERABLE status within the associated Completion Time, the plant must be brought to a MODE in which the LC0 does not apply.
To achieve this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and pressurizer pressure reduced to < 715 psia within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
The allowed _ Completion Times are reasonable, based on operating experience, to reach the required plant conditions. Tom full power conditions in an orderly manner and without challenging plant systems.
(continued)
SAN ON0FRE--UNIT 2 B 3.5-7 Amendment No.
02/28/95
SITS B 3.5.1 BASES ACTIONS DJ (continued)
If more than one SIT is inoperable, the unit is in a l'
condition outside the accident analyses. Therefore, LC0 3.0.3 must be entered immediately.
1 SURVEILLANCE SR 3.5.1.1 l
REQUIREMENTS Verification every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> that each SIT isolation valve is fully open, as indicated in the control room, ensures that l
SITS are available for injection and ensures timely discovery if a valve should be partially closed.
If an l
isolation valve is not fully open, the rate of injection to l
the RCS would be reduced. Although a motor operated valve 1
should not change position with power removed, a closed I
valve could result in not meeting accident analysis a::sumptions. A 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Frequency is cons,idered reasonable in view of other administrative controls that ensure the l
unlikelihood of a mispositioned isolation valve.
i SR 3.5.1.2 and SR 3.5.1.3 SIT borated water volume and nitrogen cover pressure should l
be verified to be within specified limits every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> in order to ensure adequate injection during a LOCA.
Due to the static design of the SITS, a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Frequency usually allows the operator sufficient time to identify changes i
before the limits are reached. Operating experience has shown this Frequency to be appropriate for early detection 1
and correction of off normal trends.
SR 3.5.1.4 Thirty-one days is reasonable for verification to determine i
that each SIT's boron concentration is within the required limits, because the static design of the SITS limits the ways in which the concentration can be changed. The 31 day Frequency is adequate to identify changes that could occur from mechanisms such as stratification or inleakage. A preferred method to sampling is permitted for verifying the boron concentration in the SIT after a greater than or equal l
(continued)
SAN ON0FRE--UNIT 2 B 3.5-8 Amendment No.
02/28/95 l
l
SITS B 3.5.1 BASES SURVEILLANCE SR 3.5.1.4 (continued)
REQUIREMENTS to 1% volume increase in the SIT not caused by deliberate filling of the SIT from the RWST. This method requires, within six hours, that the new boron concentration of the affected SIT shall be calculated using the volume change of the SIT and the results of the recent RCS boron analysis.
If the result of the calculation indicates the boron concentration of the affected SIT is within the limits specified in this SR, the surveillance verification is satisfied.
It is not necessary to varify boron concentration if.the added water is from the RWST, because the water contained in the RWST is within the SIT boron concentration requirements. This is consistent with the recommendations of NUREG-1366 (Ref. 5).
SR
- 3. L 1. 5 Verification every 31 days that power is removed from each SIT isolation valve operator when the pressurizer pressure is a 715 psia ensures that an active failure could not result in the undetected closure of an SIT motor operated isolation valve.
If this were to occur, only two SITS would be available for injection, given a single failure coincident with a LOCA.
Since installation and removal of power to the SIT isolation valve operators is conducted under administrative control, the 31 day Frequency was chosen to provide additional assurance that power is removed.
This SR allows power to be supplied to the motor operated isolation valves when RCS pressure is < 715 psia, thus allowing operational flexibility by avoiding unnecessary delays to manipulate the breakers during unit startups or shutdowns.
Even with power supplied to the valves, inadvertent closure is prevented by the RCS pressure interlock associated with the valves.
Should closure of a valve occur in spite of the interlock, the SI signal provided to the valves would open a closed valve in the event of a LOCA.
(continued)
SAN ON0FRE--UNIT 2 B 3.5-9 Amendment No.
02/28/95
- _. _ _ _ _ _ _ _. _ _ ~ _ _
SITS B 3.5.1 BASES (continued)
REFERENCES 1.
2.
UFSAR, Section 6.3.
3.
-4.
UFSAR, Chapter 15.
i 5.
NUREG-1366, December 1992.
)
l i
SAN.0N0FRE--UNIT 2 B 3.5-10 Amendment No. 02/28/95 i
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ATTACHMENT "B" 1
i POST PCN-299 (TECHNICAL SPECIFICATION IMPROVEMENT PROGRAM) SPECIFICATIONS UNIT 3 i
4 i
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j SITS 3.5.1 f
3.5 EMERGENCY CORE COOLING SYSTEMS (ECCS)-
3.5.1 Safety Injection Tanks (SITS) i LC0 3.5.1 Four SITS shall be OPERABLE.
APPLICABILITY:
MODES 1 and 2, MODE 3 with pressurizer pressure a: 715 psia.
ACTIONS CONDITION REQUIRED ACTION-COMPLETION TIME A.
One SIT inoperable due A.1 Restore boron 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to boron concentration concentration to not within limits.
within limits.
B.
One SIT inoperable for B.1 Restore SIT to I hour reasons other than OPERABLE status.
. Condition A.
C.
Required Action and C.1 Be in MODE 3.
- 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion Time of Condition A MNID or B not met.
C.2 Reduce pressurizer 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> pressure to
< 715 psia.
D.
Two or more SITS D.i Enter LC0 3.0.3.
Immediately inoperable.
SAN ON0FRE--UNIT 3 3.5-1 Amendment No.
02/28/95 l
SITS B 3.5.1 BASES ACTIONS Ad (continued) during reflood concentrates the boron in the saturated liquid that remains in the core.
In addition, the volume of the SIT is still available for injection. Since the boron requirements are based on the average boron concentration of the total volume of three SITS, the consequences are less severe than they would be if an SIT were not available for injection. Thus, 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> is allowed to return the boron concentration to within limits.
L1 If one SIT is inoperable, for a reason other than boron concentration, the SIT must be returned to OPERABLE status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
In this Condition, the required contents of three SITS cannot be assumed to reach the core during a LOCA. Due to the severity of the consequences should a LOCA occur in these conditions, the I hour Completion Time to open the valve, remove power to the valve, or restore the proper water volume or nitrogen cover pressure ensures that prompt action will be taken to return the inoperable accumulator to OPERABLE status. The Completion Time minimizes the exposure of the plant to a LOCA in these conditions.
C.1 and C.2 If the SIT cannot be restored to OPERABLE status within the associated Completion Time, the plant must be brought to a MODE in which the LC0 does not apply. To achieve this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and pressurizer pressure reduced to < 715 psia within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.
J (continued) l SAN ON0FRE--UNIT 3 B 3.5-7 Amendment No.
02/28/95 2
l SITS B 3.5.1 BASES ACTIONS L1 (continued)
If more than one SIT is inoperable, the unit is in a condition outside the accident analyses.
Therefore, LC0 3.0.3 must be entered immediately.
SURVEILLANCE SR 3.5.1.1 REQUIREMENTS Verification every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> that each SIT isolation valve is i
fully open, as indicated in the control room, ensures that I
SITS are available for injection and ensures timely discovery if a valve should be partially closed.
If an isolation valve is not fully open, the rate of injection to the RCS would be reduced. Although a motor operated valve should not change position with power removed, a closed valve could result in not meeting accident analysis assumptions. A 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Frequency is considered reasonable in view of other administrative controls that ensure the unlikelihood of a mispositioned isolation valve.
SR 3.5.1.2 and SR 3.5.1.3 SIT borated water volume and nitrogen cover pressure should be verified to be within specified limits every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> in order to ensure adequate injection during a LOCA.
Due to the static design of the SITS, a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Frequency usually allows the operator sufficient time to identify changes before the limits are reached. Operating experience has shown this Frequency to be appropriate for early detection and correction of off normal trends.
SR 3.5.1.4 Thirty-one days is reasonable for verification to determine that each SIT's boron concentration is within the required limits, because the static design of the SITS limits the ways in which the concentration can be changed.
The 31 day Frequency is adequate to identify changes that could occur from mechanisms such as stratification or inleakage. A preferred method to sampling is permitted for verifying the boron concentration in the SIT after a greater than or equal (continued)
SAN ON0FRE--UNIT 3 B 3.5-8 Amendment No.
02/28/95
SITS B 3.5.1 BASES SURVEILLANCE SR 3.5.1.4 (continued)
REQUIREMENTS to 1% volume increase in the SIT not caused by deliberate filling of the SIT from the RWST. This method requires, within six hours, that the new bcron concentration of the affected SIT shall be calculated using the volume change of the SIT and the results of the recent RCS boron analysis.
If the result of the calculation indicates the boron concentration of the affected SIT is within the limits specified in this SR, the surveillance verification is satisfied.
It is not necessary to verify boron concentration if the added water is from the RWST, because the water contained in the RWST is within the SIT boron concentration requirements. This is consistent with the recommendations of NUREG-1366 (Ref. 5).
SR 3.5.1.5 Verification every 31 days that power is removed from each SIT isolation valve operator when the pressurizer pressure i s 2: 715 psia ensures that an active failure could not result in the undetected closure of an SIT motor operated isolation valve.
If this were to occur, only two SITS would be available for injection, given a single failure coincident with a LOCA.
Since installation and removal of power to the SIT isolation valve operators is conducted under administrative control, the 31 day Frequency was chosen to provide additional assurance that power is removed.
This SR allows power to be supplied to the motor operated isolation valves when RCS pressure is < 715 psia, thus allowing operational flexibility by avoiding unnecessary delays to manipulate the breakers during unit startups or shutdowns.
Even with power supplied to the valves, inadvertent closure is prevented by the RCS pressure interlock associated with the valves.
Should closure of a valve occur in spite of the interlock, the SI signal provided to the valves would open a closed valve in the event of a LOCA.
(continued)
SAN ON0FRE--UNIT 3 B 3.5-9 Amendment No.
02/28/95
SITS B 3.5.1 BASES (continued)-
REFERENCES 1.
2.
UFSAR, Section 6.3.
3.
4.
UFSAR, Chapter 15.
5.
NUREG-1366, December 1992.
SAN ON0FRE--UNIT 3 B 3.5-10 Amendment No.
02/28/95
9 i
ATTACHMENT "C" PROPOSED SPECIFICATIONS UNIT 2 1
SITS 3.5.1 3.5 EMERGENCY CORE COOLING SYSTEMS (ECCS) 3.5.1 Safety Injection Tanks (SITS) l LC0 3.5.1 Four SITS shall be OPERABLE.
l l
l 1
APPLICABILITY:
MODES 1 and 2, MODE 3 with pressurizer pressure a 715 psia.
ACTIONS 1
CONDITION REQUIRED ACTION COMPLETION TIME
)
i A.
One SIT inoperable due A.1 Restore boron 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />
]
to boron concentration concentration to i
not within limits.
within limits.
BM0nsisIT6inoperableidde B7E ' FReitorsiSITit6 721houbs
" ~~tn%11oy[ystoWeiFiffessufef" inabilit "0PERABLEiststui?
" " ~ "
~ ~ " ~ " " ~ ~ ~
le h
Br C? One SIT inoperable for Cjl Restore SIT to 1bcur2Qoup reasons other than OPERABLE status.
Condition A or B.
C--
C-D.
Required Action and 0.1 Be in MODE 3.
6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion TimeofConditionAi AND B2orBC;notmet."
D.2 Reduce pressurizer 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />
^
pressure to
< 715 psia.
9 9
~E. Two or more SITS E.1 Enter LC0 3.0.3.
Immediately inoperable.
SAN ON0FRE--UNIT 2 3.5-1 Amendment No.
2 SITS B 3.5.1 4
BASES ACTIONS L1 (continued) l during reflood concentrates the baron in the saturated liquid that remains in the core.
In addition, the volume of the SIT is still available for injection.
Since the boron requirements are based on the average boron concentration of j
the total volume of three SITS, the consequences are less severe than they would be if an SIT were not available for injection.
Thus, 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> is allowed to return the boron concentration to within limits.
i B.1 If cac SIT i; incper:ble, fer : r ::ca cther than boren concentr:tica, the SIT =u;t be returned t OPE"^2LE :tatu within I hcur.
In thi: Ccaditica, the required centent; cf three SIT: canact bc ::: :cd to rc ch the ccre during :
LOCA.
Duc tc the severity of the cca:cqucacc: cheuld : LOCA cccur in thc;c conditions, the I hcur Cc=pletica Ti=c to apen the valve, rc ve pcwer to the valve, cr rc:tcre the proper water vclu=c cr nitregen ccver prc :ure ensure: that prc=pt action will be taken tc return the incper:ble
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minimicc: the expccure of the plant t: ; LOC" in the:c ccadition.
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sdrveil l ancss:?riqui rement sli ni tschs i cal fspeb i fi cati on sifoE thefinstrumsntichashelsfusedlin?thesessurssent3cfdstsi
,1sysl_iasd,; press.s_ eel;iniSITsi, "~"" *~"~'" """
Sect,'ibnE7:4.1."6CRefer., e. ricel5?st ates. Ei..h,i p.a_rtY EThe'c~ombinatioh70ffredsndantMsVelfindTpFesiufs i n s tvumentati oniforlanisi ngl elSITImay3 rb Vi deisn'ffi di ent
'i n fo rmati oblio ith atili tt siay.[notiilbe.l.sorthwhil e jtofalwayF' attemptstofcorrectidriftfassociated(with?odelinstrument
[with.TesultingiradiatlohjexpbsuresiduFing[shtpilinto" tbntai nment]si ff theret were 2iu f fi ci ents t imeltoirepaiWWn6Ti n thefeventsthatsa secondLonejbecamelinosierablekBecassi" "
e theset i n s t rnment sidoinctli ni ti ate S s a fetyiscti on sti tsi s Fehsonable toTstendithstall'sableibstagesfonithsC:The i
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(continued)
SAN ONOFRE--UNIT 2 B 3.5-7 Amendment No.
SITS B 3.5.1 BASES ACTIONS jkl (continued) condition be established:for the ' specific case, where"One' accumulator (SIT) is inoperable due to the inoperability of, water level and pressure channels," in which the completion time to restore the accumulator to operable status will be'^
72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. While technically inoperable, the accumulator,'"
would be available to fulfill its safety function during this time and, thus, this change would have a negligible increase _i,nrisk,."~~
' ^ ^ ~ ' ' '^' "
fL1 If one SIT is inoperable, for a reason 'other than boron concentration or the inability to verify level or pressure ^,"
the SIT must be returned to OPERABLE status within 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />sJ:
In this Condition,,the required contents of three SITS
" ^ ' ~ " "
' annot be assumed to reach the core during a LOCA as is c
asspeed in Appendix,K,to 10CFR50,
' ' ^ ' " '
^
Rd ferenc'e WpF6VidesWisFi fiToffddtsrmidi s t iWihd probstill i sticEfindi WgsifthatFssppshti24s hsspilailbsi hs eithehWisk!6ensfiEialMorMiskissutFs1"Mnissepsni;i6sith "shoEteriperi6diif6E# sit 6rispithsiSITitol0PERABLEiststsEC Referenset71diseussssfaibistiestimatsianalyiissthstI ~~""
c6nfimed ? thatNdupinM1 arps?bisakiLOCAiscenssi osphordiniel t canibesprevsntedibi?sithe'rtsp6 Fit 16n:fofionsitsw?PAsssri" ~
SafstphInjssti6ni{ LPSI)ppsspibbitise(spiritish76ffssi Hiih Re feren:elsafetyy nj ect i dn }(HPSI )] pump [and t als}ngley Pressur ce f ilsoldiscussesga yecovegperisdyn.uhtedithe[j pla~ tispecificip n
analysisitha_tiivil rfikMapactiofsthel24jhourT^~ _
y.cpaparj sons tophorterflecoveryj pefi dd sj E0.1 and G0.2 If the SIT cannot be restored to OPERABLE status within the associated Completion Time, the plant must be brought to a MODE in which the LC0 does not apply. To achieve this status, the plant must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and pressurizer pressure reduced to < 715 psia within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. The allowed Completion Times are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems.
(continued)
SAN ON0FRE--UNIT 2 B 3.5-8 Amendment No.
.- -.. - - - ~. - - _
SITS j,
B 3.5.1 BASES l, '
i ACTIONS-EL].
l j
(continued)
If more than one SIT is inoperable, the unit is in a condition outside the accident analyses.
Therefore, LC0 3.0.3 must be entered immediately.
e i
SURVEILLANCE SR 3.5.1.1 1
REQUIREMENTS J
Verification every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> that each SIT isolation valve is i
fully open, as indicated in the control rocm, ensures that i
SITS are available for injection and ensures timely discovery if a valve should be partially closed.
If an i
isolation valve is not fully open, the rate of injection to
[
the RCS would be reduced. Although. a motor operated valve
]-
should not change position with power removed, a closed valve could result in not meeting accident analysis assumptions.. A 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Frequency is considered reasonable in view of other administrative controls that ensure the unlikelihood of a mispositioned isolation valve.
s SR 3.5.1.2 and SR 3.5.1.3 i
SIT borated water volume and nitrogen cover pressure should be verified to be within specified limits every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> in order to ensure-adequate injection during a LOCA. Due to the static design of the SITS, a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Frequency usually i-allows the operator sufficient time to identify changes i
before the limits are reached. Operating experience has shown this Frequency to be appropriate for early detection 2
and correction of off normal trends.
SR 3.5.1.4 Thirty-one days is reasonable for verification to determine that each SIT's boron concentration is within the required limits, because the static design of the SITS limits the i
).
ways in which the concentration can be changed. The 31 day Frequency is adequate to identify changes that could occur 4
from mechanisms such as stratification or inleakage. A preferred method to sampling is permitted for verifying the 3
boron concentration in the SIT after a greater than or equal i
to 1% volume increase in the SIT not caused by deliberate filling of the SIT from the RWST. This method requires, 4
(continued)
SAN ON0FRE--UNIT 2 B 3.5-9 Amendment No.
e p
i-ym-er g
---rw g
-r-
SITS B 3.5.1 BASES SURVEILLANCE SR 3.5.1.4 (continued)
REQUIREMENTS within six hours, that the new boron concentration of the affected SIT shall be calculated using the volume change of the SIT and the results of the recent RCS boron analysis.
If the result of the calculation indicates the boron concentration of the affected SIT is within the limits specified in this SR, the surveillance verification is satisfied.
It is not necessary to verify boron concentration if the added water is from the RWST, because the water contained in the RWST is within the SIT boron concentration requirements. This is consistent with the recommendationsofNUREG-1366(Ref.5)QRsfpNnbe@p{&ny Referece%
SR 3.5.1.5 Verification every 31 days that power is removed from each SIT isolation valve operator when the pressurizer pressure is a 715 psia ensures that an active failure could not result in the undetected closure of an SIT motor operated isolation valve.
If this were to occur, only two SITS would be available for injection, given a single failure coincident with a LOCA. Since installation and removal of power to the SIT isolation valve operators is conducted under administrative control, the 31 day Frequency was chosen to provide additional assurance that power is removed.
This SR allows power to be supplied to the motor operated isolation valves when RCS pressure is < 715 psia, thus allowing operational flexibility by avoiding unnecessary delays to manipulate the breakers during unit startups or shutdowns.
Even with power supplied to the valves, inadvertent closure is prevented by the RCS pressure interlock associated with the valves. Should closure of a valve occur in spite of the interlock, the SI signal provided to the valves would open a closed valve in the event of a LOCA.
1 (continued) i SAN ON0FRE--UNIT 2 B 3.5-10 Amendment No.
1 1
SITS B 3.5.1 i
r l
BASES (continued)
REFERENCES 1.
2.
UFSAR, Section 6.3.
l l
3.
1 4,
UFSAR, Chapter 15.
l 5.
NUREG-1366, December 1992.
61P3iNRC7GshEffE?iL^stt#E93:05?M Lihe:lteiiDTidhhiEul m3 g f96 d 6'6 W e n ' M d'fR's W 661SdrV6111Ahti RedsifessntssfohsTsstin 0drid PowshiO ntions 2 Sept @edyj199 ""p"'""*gl~ ~y"""~"["* ""~"f. CE? NPSD4994]iEf CEOGiJoi htiAppl i catibniLRepbrtifd ri$afety 7X _..e,b$.nsnn,as!:i.T,asklE,A0T,/.u.T.INEi,tensioh!..",!!,Mi,y!s1.n99.a.a.6 ~ ~ " ~^ '" s S .a a, n.n ; s. n.u.x nm. a. .n c l i i l I I SAN ON0FRE--UNIT 2 Bj}if{10a Amendment No. 1
I ATTACHMENT "D" l PROPOSED SPECIFICATIONS UNIT 3 I 1 1 i i i
i i SITS 3.5.1 3.5 EMERGENCY CORE COOLING SYSTEMS (ECCS) 3.5.1 Safety Injection Tanks (SITS) i LC0 3.5.1' Four SITS shall be OPERABLE. APPLICABILITY: MODES 1 and 2, l-MODE 3 with pressurizer pressure 2: 715 psia. ACTIONS i ^ CONDITION REQUIRED ACTION COMPLETION TIME A. One SIT inoperable-due A.1 Restore boron 72 hours to boron concentration concentration to not within limits. within limits. Bg!OndiSITEinoperabl.eidde ! R 1 Rest 6Fi3SITits [2]hoff toAir ability 2toEverify OPERABLEatatuH lpsljj66[p[eljuhi[~ ^ " ~ ~ " ~ ~ ~ " ~ " ^ Br Br CJj One SIT inoperable for C11 Restore SIT to Ihcur24jp6sys reasons other than OPERABLE status. j Condition A or B. Gr Gr D. Required Action and D.1 Be in MODE 3. 6 hours associated Completion ^ i Time of Condition A? AND i B;: orb!Cnotmet." D.2 Reduce pressurizer 12 hours pressure to < 715 psia. 9 9 E. Two or more SITS E.1 Enter LC0 3.0.3. Immediately inoperable. SAN ONOFRE--UNIT 3 3.5-1 Amendment No.
SITS B 3.5.1 BASES l l ACTIONS - Ad (continued) ] i during reflood concentrates the boron in the saturated liquid that remains in the core. In addition, the volume of ) the SIT is still available for injection. Since the boron 1 requirements are based on the average boron concentration of I the total volume of three SITS, the consequences are less severe than they would be if an SIT were not available for injection. Thus, 72 hours is allowed to return the boron concentration to within limits. . lkl If :n SIT is incperable, for a rea n Other th;n 50r n concentration, the SIT mu:t be returned t OPERA.SLE :tatu within I hour. In thi; Condition, the required cent nt: Of three SIT: c:nnet bc ::::::d to re:ch the c;re during : LOCA. Due to th: : verity of th: con:cquence: :h: ld : LOCA
- cur in th::: condition:, the I hour C::pletion Time t Open the valve, re::ve p : r t; the v;lve, or rc:tcrc the pr:per ::ter vele:: er nitregen cover pre::ure en:ure: th:t prc pt action will be t ken to return the inoper:ble
- cumulater to OPERASLE :tatu:.
The C =pletion Ti= minimi::: the exp;;cre of the pl::t t: : LOCA in th :: conditi n:. Sicti6hMT4?of?RsfspshEs75 NNUREGil366??diWhsisi j survsill sshiWs4si Fsmintininitschsi cal dpsdi ficit lonK f6h t hsiint'rumenuchanneli 3sedlii Mths? maissur'emsst%fj"sstsi lev,eliss.d,iipress.spe. l,_in1S._ITst ^~*""" ~ ~ ~ ~ * " " ' " " . o67 l4.Iofi R.ef.e.r, enEe_!.5 Fst a.tu,lli, nip _arti Secti "The combination of redundant' level'and pressure instrumentation for any single SIT may provide, sufficient information so that it may not be worthwhile to always~~' i attempt to correct drift associated with one, instrument [with resulting radiation exposures,during entry into ' containment) if there were sufficient time to repair one in the event that a second one became inoperable. Because I these instruments do not, initiate a safety action, it is rusonable to extend.the allowable outage for them.' The [N. RC] staff, therefore, recommends, that an additional ' (continued) SAN ON0FRE--UNIT 3 8 3.5-7 Amendment No. i -a r a w
SITS B 3.5.1 BASES ACTIONS IL1 (continued) ' condition'be' established for the specific case,' where~"One iccumulator (SIT) is inoperable due to the inoperability of water level and pressure channels," in which the completion time to restore the accumulator to operable status will be 72 hours. While technically inoperable, the accumulator, would be available to fulfill its safety function during this time and, thus, this change would have a negligible increase in, risk."" ' ' ^ ~ ~ " ' ' " ' ' L1 If one SIT is' inoperable,'for*'a' reason other than borori concentration or the inability to verify level or pressure,' the SIT must be returned to OPERABLE status within 24 hours. ' In this Condition, the required contents of three SITS ^ cannot be assumed to reach the core during a LOCA as is' assumed in Appendix K to 10CFR50, ~ Reference 7 provides a 'seHes of deterministic and probabilistic findings that support 24 hours as being either
- risk beneficial" or " risk neutral" in comparison to shorter periods for restoring the SIT to OPERABLE status.,
Reference 7 discusses a best-estimate analysis that confirmed that, during large-break LOCA scenarios, core melt can be prevented by either operation of one Low Pressure' ' Safety Injection (LPSI) pump or the operation of one High Pressure Safety Injection (HPSI) pump and a single SIT, ' Reference 7 also discusses a plant-specific probabilistic analysis that evaluated the risk-impact of the 24 hour recovery period,in comparison,to shorter recovery periods!, G0.1 and GD.2 If the SIT cannot be restored to OPERABLE status within the associated Completion Time, the plant must be brought to a MODE in which the LC0 does not apply. To achieve this I status, the plant must be brought to at least MODE 3 within 6 hours and pressurizer pressure reduced to < 715 psia within 12 hours. The allowed Completion Times.are reasonable, based on operating experience, to reach the required plant conditions from full power conditions in an orderly manner and without challenging plant systems. (continued) SAN ONOFRE--UNIT 3 B 3.5-8 Amendment No.
? SITS B 3.5.1 BASES i ACTIONS f)L1 l (continued) If more than one SIT is inoperable, the unit is in a condition outside the accident analyses. Therefore, LC0 3.0.3 must be entered immediately. J l \\ SURVEILLANCE SR 3.5.1.1 l REQUIREMENTS Verification every 12 hours that each SIT isolation valve is fully open, as indicated in the control room, ensures that SITS are available for injection and ensures timely 4 discovery if a valve should be partially closed. If an isolation valve is not fully o)en, the rate of injection to j the RCS would be reduced. Altlough a motor operated valve should not change position with power removed, a closed valve could result in not meeting accident analysis assumptions. A 12 hour Frequency is considered reasonable in view of other administrative controls that ensure the unlikelihood of a mispositioned isolation valve. SR 3.5.1.2 and SR 3.5.1.3 SIT borated water volume and nitrogen cover pressure should be verified to be within specified limits every 12 hours in order to ensure adequate injection during a LOCA. Due to the static design of the SITS, a 12 hour Frequency usually allows the operator sufficient time to identify changes before the limits are reached. Operating experience has shown this Frequency to be appropriate for early detection and correction of off normal trends. 4 SR 3.5.1.4 Thirty-one days is reasonable for verification to determine that each SIT's boron concentration is within the required limits, because the static design of the SITS limits the ways in which the concentration can be changed. The 31 day Frequency is adequate to identify changes that could occur from mechanisms such as stratification or inleakage. A preferred method to sampling is permitted for verifying the boron concentration in the SIT after a greater than or equal to 1% volume increase in the SIT not caused by deliberate filling of the SIT from the RWST. This method requires, i (continued) SAN ON0FRE--UNIT 3 B 3.5-9 Amendment No.
SITS B 3.5.1 BASES SURVEILLANCE SR 3.5.1.4 (continued) REQUIREMENTS within six hours, that the new boron concentration of the affected SIT shall be calculated using the volume change of the SIT and the results of the recent RCS boron analysis. If the result of the calculation indicates the boron concentration of the affected SIT is within the limits specified in this SR, the surveillance verification is satisfied. It is not necessary to verify boron concentration if the added water is from the RWST, because the water contained in the RWST is within the SIT boron concentration requirements. This is consistent with the recommendationsofNUREG-1366(Ref.5)MRefeNndI6pihd Refe're_nlc_e171 -^ SR 3.5.1.5 Verification every 31 days that power is removed from each SIT isolation valve operator when the pressurizer pressure i s 2: 715 psia ensures that an active failure could not result in the undetected closure of an SIT motor operated isolation valve. If this were to occur, only two SITS would be available for injection, given a single failure coincident with a LOCA. Since installation and removal of power to the SIT isolation valve operators is conducted under administrative control, the 31 day Frequency was chosen to provide additional assurance that power is removed. This SR allows power to be supplied to the motor operated isolation valves when RCS pressure is < 715 psia, thus allowing operational flexibility by avoiding unnecessary delays to manipulate the breakers during unit startups or shutdowns. Even with power supplied to the valves, inadvertent closure is prevented by the RCS pressure interlock associated with the valves. Should closure of a valve occur in spito of the interlock, the SI signal provided to the valves would open a closed valve in the event of a LOCA. (continued) SAN ON0FRE--UNIT 3 B 3.5-10 Amendment No.
SITS t B 3.5.1 BASES (continued) REFERENCES 1. IEEE Standard 279-1971. 2. UFSAR, Section 6.3. 3. 10 CFR 50.46. 4. UFSAR, Chapter 15. I 5. NUREG-1366, December 1992. ) 6." NRC Generic" Letter' 93;05',' "Line-Item Technical Specification Improvements to Reduce Surveillance i Requirements for Testin During Power Operations,", 5_eptember,27, 1993., " "g' ' " ' ~ ~ ' ~ ^ '" "' " i 7;. CE NPSD;994,'*CE0G Joint Application' Report for~ Safety " In(qction Tan,k A0J/STI, Exten,sion,",,,May,1995. ~ ' '*' ' ' } i SAN ON0FRE--UNIT 3 B{3!Sjlps Amendment No.}}