ML20046C203

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Proposed Tech Specs 3.8.y Re LCO
ML20046C203
Person / Time
Site: 05200001
Issue date: 07/28/1993
From:
GENERAL ELECTRIC CO.
To:
Shared Package
ML20046C194 List:
References
TECH-930728, NUDOCS 9308090338
Download: ML20046C203 (12)
v • d • e


Text

'

Ac Sources--Shutdown 3.8.Y

                  • JU"E 15, 1993 DREM MINARY DRAFT ' = = ' ^

P 3.8 ELECTRICAL POWER SYSTEMS 3.8.Y Ac Sources--Shutdown (Lc 0 L3,4e< Lesel )

LCO 3.8.Y The following ac electrical power sources end lcr&-

-scquercers shall be OPERABLE and capable of supplying both divisions of required OPERABLE features:

Juo olo.vi sion s a.

One qualified circuit between the offsite transmission network capable of supplying both troias of the onsite Class 1E a,p electrical power distribution subsystem (s) required by LCO 3.8.10, " Distribution Systems--Shutdown and Refueling".

b.

Two diesel generators (DGs) capable of supplying two ddid'I'^*

r

-ttems of the onsite Class 1E ag electrical power distribution subsystem (s) required by LC0 3.8.10.

-- c.

Sutomatic l^2d regt!encers as:ccicted with the twu DGs-capable of sequencing ente the OGs wmiriir;iura, the

-support :ystem: necessary for continued oper& tion of the-

- DCs. -

APPLICABILITY:

MODES 4 and 5 with water level in the refueling cavity < 23 ft above the reactor pressure vessel flange.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME

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J 9308090339 930728 I'

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Ac Sources-Shutdcen 3.8.Y A.

One required qualified A f 'c2 Initiate action to Immediately offsite circuit restore required off-inoperable or incap-site power circuit to able of supplying both OPERABLE status.

trains of the onsite Class IE ac electrical AND power dis 6ibution subsystem (s).

A.MJ Declare affected 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> required features

[

with no offsite power

/^available inoperable 7O r # " g and enter applicable Conditions and g g o s)d f Required Actions of the LCOs for the inoperable required features.

(continued)

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i Model STS for BWR/2/3/4/5 Plants i

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Ac Sources-Shutdown 3.8.Y ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME B.

One or more required S.1 Declare the DC of en Imed i ately-DG er-its 2 :cci-ate +

_ir.;per2ble iced load sequencer-requencer inoperablo-inoperable.

AND i

B.2 Initiate action to Immediately restore required DG to OPERABLE status.

AND B.3 Declare affected 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> required feature (s) by the gy4 n a m a-apport;{c99inoper-mcper:b.

py47G able and enter Appli-cable Conditions and b"/8#

Required Actions of the LCOs for the inoperable required feature (s).

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Model STS for BWR/2/3/4/5 Plants

Ac Sources--Shutdown 3.8.Y i

' ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME i

C.

Two or more required uC 1 Declare the DC cf aa-

~Irmedictcly --

ac sources er DC leed-inoperable le:d-FE uenceet inoperable.

-sequencer inopercble.

q AND C.F 1 Declare affected Immediately required feature (s) normally supported by the inoperable Ac sources inoperaEle and enter applicable Conditions and Required Actions of the LCOs for the inoperable required fehture(s).

AND C.39A Initiate action to Immediately restore required aj sources to OPERABLE status.

I SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY i

SR 3.8.Y.1 For ac sources required to be OPERABLE, the In accordance following SRs are required to be met:

with applicable i

SRs SR 3.8.1.1 SR 3.8.1.5 SR 3.8.1.11.

SR 3.8.1.2 SR 3.8.1.6 SR 3.8.1.15

  • 0nly required when more than the minimum AC sources of LC0 3.8.Y are available but at least once every six months.

Model STS for BWR/2/3/4/5 Plants

l AC Sources-Shutdown B 3.8.7 y r

B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.J' AC Sources-Shutdown (Lot) 4M/er IM/)

T BASES I

BACKGROUND A description of the AC sources is provided in the Bases for LCO 3.8.1, "AC Sources-Operating."

APPLICABLE The OPERABILITY of the minimus AC sources during MODES 4 SAFETY ANALYSES and 5 ensures that:

i a.

The unit can be maintained in the shutdown or refueling condition for extended periods; b.

Sufficient instrumentation and control capability is available for monitoring and maintaining the unit l

status; and c.

Adequate AC electrical power is provided to mitigate events postulated during shutdown, such as an inadvertent draindown of the vessel or a fuel handling accident.

In general, when the unit is shut down the Technical Specifications (TS) requirements ensure that the unit has the capability to mitigate the consequences of postulated accidents. However, assuming a single failure and concurrent loss of all offsite or loss of all onsite power is not required. The rationale for this is based on the fact that many Design Basis Accidents (DBAs) which are analyzed in MODES 1, 2, and 3, have no specific analyses in MODES 4 and 5.

Worst case bounding events are deemed not credible in MODES 4 and 5 because the energy contained within the' reactor pressure boundary, reactor coolant temperature and pressure, and the corresponding stresses i

result in the probabilities of occurrence significantly l

reduced or eliminated, and minimal consequences. These deviations from DBA analysis assumptions and design requirements during shutdown conditions are allowed by the LCO for required systems.

J During MODES 1, 2, and 3 various deviations from the J

analysis assumptions and design requirements are allowed-l within the ACTIONS. This allowance is in recognition that-

]

(continued)

BWR/6 STS 8 3.8-35 Rev. O,09/28/92

-l

~

AC Sturces-Shutdown 8 3.8.2 BASES APPLICABLE certain testing and maintenance activities must be conducted i

SAFETY ANALYSES provided an acceptable level of risk is not exceeded.

(continued)

During MODES 4 and 5, perfomance of a significant number of required testing and maintenance activities is also required.

In MODES 4 and 5, the activities are generally planned and administrative 1y controlled. Relaxations from typical MODE s. 2, and 3 LCO requirements are acceptable during shutdown MODES based on:

a.

The fact that time in an outage is limited. This is a risk prudent goal as well as utility economic consideration.

b.

Requiring appropriate compensatory measures for certain conditions. These may include administrative controls, reliance on systems that do not necessarily meet typical design requirements applied to systems credited in operating MODE analyses, or both.

c.

Prudent utility consideration of the risk associated with multiple activities that could affect multiple

. systems.

ractical, the ability to Maintaining, to the extent p(even if not meeting d.

perform required functions MODE 1, 2, and 3 OPERASILITY requirements) with systems assumed to function during an event.

In the event of an accident during shutdown, this LC0 ensures the capability of supporting systems necessary to' avoid immediate difficulty, assuming either a loss of all offsite power or a loss of all onsite (diesel generator (DG)) power.

The AC sources satisfy Criterion 3 of the NRC Policy' Statement.

l LCO One offsite circuit. capable of-supplying onsite Class IE-power distribution subsystem (s) of LC0 3.8.10, " Distribution Systems-Shutdown,' ensures that all required MetyistrT

  • ' ';i= 0 Ed r i:S.' are powered from offsite

- loads,h0ptRA8LE065, associated with / Division 1 er j r.

..O':... Distribution System Egineered Safety Fea,ture 3.8.10, ensure a diverse (ESF)p required OPERABLE by L pes -

(continued)

BWR/6 STS 8 3.8-36 Rev.

O, 09/28/92-t---

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l 1

AC Sources-Shutdown i

8 3.8.2 BASES LCO power source is available to provide electrical power (continued) support, assuming a loss of the offsite circuit.

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"*CS.

ogether, OPERABILITY of the required l

offsite circuit and ensure the availability of sufficient AC sources to operate the plant in a safe manner and to mitigate the consequ ces of postulated events during shutdown (e.g., fuel handling accidents, reactor vessel draindown).

gg The qualified offsite circuit (s) must be capable of ma bte!r,;r.g rated frequency)and voltage while connect i

during an accident. Qualified offsite circuits are those that are described in the5FSAR and are part of the licensing basis for the plant.

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st be capable of starting, accelerating to I

The required rated speed and voltage, and connecting to its respective ESF bus on detection of bus undervoltage, and accepting required loads. This sequence must be accomplished within 78-64 seconds. Each DG aust also be capable of accepting required loads within the assumed loading sequence intervals, and must continue to operate until offsite power

~

can be restored to the ESF buses..These capabilities are required to be met from a variety of initial conditions such DG in standby with the engine hot, DG in standby with as:

the engine at ambient conditions, and DG operating in parallel test mode.

Proper sequencing of loads, including tripping of nonessential loads, is a required function for DG

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OPERASILITY.

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(continued) 8 3.8-37 Rev.

0, 09/28/92 BWR/6 STS i

AC Sources-Shutdown

.b B 3.8.2 y;

@ddos Coedi 8cdj i d '. )

BASES 4"#I N

LCO It is ecceptaMe f r di.~isi=; t: 5 treer tied durin;;

(continued)

- 6td-a ce=diti=:. p; mitt circuittosupplyallrequire%asingleoffsitepowerd divisions. @: '.;;

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y, wn.., g O?:7l.0L -l As described in Applicable Safety Analyses, in the event of an accident during shutdown, the TS are designed to maintain the plant in a condition such that, even with a single failure, the plant will not be in immediate difficulty.

t APPLICABILITY The AC sources required to be OPERABLE in MODES 4 and 5 and during movement of irradiated fuel assemblies in the g

yMpri : y ;r secondaryVcontainment provide assurance that:

a.

Systems to provide adequate coolant inventory makeup are available for the irradiated fuel in the core in case of an inadvertent draindown of the reactor.

vessel-

?

b.

Systems needed to mitigate a fuel handling accident are available; c.

Systems necessary to mitigate the effects of events that can lead to core damage during shutdown are i

available; and d.

Instrumentation and control capability is available i

for monitoring and maintaining the unit in a cold shutdown condition or refueling condition.

The AC power requirements for MODES 1, 2, and 3 are covered j

in LC0 3.8.1.

ACTIONS I

An offsi Q uit is consi inoperable if it is not

/)p6g h available to one required F division. If two or more

(,,1 _

CiE.4.rwkVbusesDre utred per LC0 3.8.10, division (s) er th offsite power al'1able any be capable of supporting g'

sufficient ut d featureets allow continuation of CORE 6

ALTERATIONS, el movement, andbtations with a potential (continued).

{

i BWR/6 STS 3 3.3 38 Rev.

0, 09/23/92

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' INSERT 1, LCO 3.8.Y BASES 1

ACTIONS A.1. A.2. A.3

)

An offsite circuit is considered inoperable if it is not available to two required ESF divisions. The onsite CTG is capable of supporting the required features of any two ESF divisions and hence operating the CTG and connect it to the required AC buses compensate for the loss of offsite power support. With no offsite power available, the DGs will supply the necesssary AC power until the CTG is connected to the required AC buses.

immediate action is required to be initiated to restore the required offsite power circuit to OPERABLE status to provide long term power supply reliability to the site.

Required features with no offsite power or CTG power support are required to be declared inoperable and actions taken per applicable LCOs since the minimum diversity of AC power sources is not available.

B.1. B.2. B.3 With one or more DGs inoperable, it is required to verify that the onsite CTG is available and capable of being aligned to the required AC buses. the CTG has sufficient capacity to supply power to any two ESF divisions. To verify CTG capability, the CTG should be started and connected to the required AC buses.

Continued operation of the CTG is however, not required.

Although the CTG does not automatically connect to the required AC buses upon loss of offsite power, manual action to start and connect the CTG to the required AC buses are sufficient since the plant will not be in immediate difficulty in MODES 4 and 5 assuming a loss of offsite power. Immediate action is required to be initiated to restore the required DG(s) to OPERABLE status to provide long term power standby supply reliability.

Required features with no DG power or CTG power support are required to be declared inoperable and actions taken per applicable LCOs since the minimum diversity of AC power sources is not available.

C.1. C.2 With both required AC sources inoperable, the normally supported feature (s) must be immediately declared inoperable and appropriate LCOs enter and Required Actions taken.

Immediate action is required to be initiated to restore the required AC sources to OPERABLE status to provide long term power supply reliability to the site.

i AC Sources-Shutdown 8 3.8.2 BASES r

ACTIONS (continued) for dr.aining the reactor vessel. By th allowance of the option \\to declare required features in perable with c.;,

offsite%ower available, appropriate restrictions can be implemented in accordance with the affected required feature (s) LCOs' ACTIONS.

/

l l

A.2.1. A.2.2. A.2.3. A.2.4. B.1. E.2. B.3. and 8.4 With the offsit circuit not ava lable to all required i

divisions, the option still exi ts to declare all required features inoperabt. Since th s option may involve undesired administ ive effo s, the allowance for sufficiently conse ive ac ons is made.. With the required DG inoperabl the inimum required diversity of AC

\\

[v power sources is not ak, ail g

le. It is, therefore, required

- [4 to suspend CORE A ERAT

, movement of irradiated fuel-s assemblies in the rima or secondary containmentK and activities that cou d pot tially result in inadvertent draining of the reactor 've el.

Suspension of these ac iviti shall not preclude' comp 1etion ofactionstoestabl%hasaf conservative condition.

i These actions sinteire probabi ty of the occurrence of postulatedevents./Itisfurt required to initiate action immediatelf to restore t required AC sources and to continue this action until restor tion is accomplished in order to providd the necessary AC r to the plant safety systems.

/

Notwithstanding performance of the ve conservative Required Actions, the plant is still without sufficient AC power sou es to operate in a safe r.

Therefore.

action su t be initiated to restore the inimum required AC power s rees and continue until the LCO quirements are l

resto The C letion Time of immediately is const ent with the requ red times for actions requiring prompt ttention. The res oration of the required AC electrical sources Id be completed as~ quickly as possible in er to s nimize the time during which the plant safety ystems may without sufficient power.

(continued)

Z/5 MS 3 3.8 39 Rev. O,09/28/92

AC S:urces-Shutdown B 3.8.2 l

BASES ACTIONS A 2.1.

A.2.3. A.2.4. B.

B.2. B.3. and B.4 i

i Tcontinued)

Pursuant to LCO 3.0.

t Distribution System ACTIONS are not entered even if al sources to it are inoperable.

resulting in de-energ a Therefore, the Required l

Actions of Conditio A have en modified by a Note to indicate that when Condition s entered with no AC power tooneESFbus,ATIONSforLCO 8.10 must be immediately i

entered. This/ Note allows Condit A to provide or the loss of the off (3.1 10 provides the te circuit whether or requirement on is de-energized. LCO l

not a divi l

appropri e restrictions for the situatio involving a de-ene,ygized division.

/

I C.1 m

When t CS is required to be OPERA 8LE, and the sion 3 OG is inoper the required diversity of ower sources to the HPCS is no allable. Since th ources only affect the HPCS, the S is ducia noperable and the Required Actions of the ett rgency Core Cooling-Systems LCO entered.

In the event all s es of power Division 3 are lost, Condition A wi so be entered a t that the ACTIONS of LC0 3.8 taken. If only the Div 3 OG is inoper

, and power is still supplied to H 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> is all to restore the DG to OPERA 8LE. This~is re ble i

sidering HPCS will still perform its function, absen additional single failure.

i SURVEILLANCE st 3.8.2.1 REQUIRDIENTS SR 3.8.2.1 requires the SRs from LC0 3.8.1 that are necest;ry for ensuring tha OPERABILITY of the AC sources in other than MODES 1, 2, and 3.

55 3.S.I.17 i: :: n;;ind to k ::t M ::::: th n;;f nd ^*"."f'S ""(:) !! et -

2 M te end: ge p=M d ;f hi:; :y;;h n:!: M te th--

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-r; dim clic.it. E 311.?" i: ::::;;tM W==e strti:5 -

__44 ::;::f:::: is ;;; n;; ired ti; iin Di(3) ilmi is eet -

_n;;f nf t: k 0"C""."'.C.~ Refer to the corresponding ~ Bases for LC0 3.8.1 for a discussion of each SR.

(continued) l 1

guayyap:s 8 3.8 40 Rev. O,09/28/92

+

. i AC Sources--Shutdorn B 3.8.2 l

BASES SURVEILLANCE SR 3)877,1 (continued)

}

ThJs SR is \\modt Qed by ae.

The reason for the Note is REQUIREMENTS to preclude requih'eg t OPERABLE DG(s) from being paralleled with the site power network or otherwise renderedinoperab) dur % the performance of SRs. With limited AC sou (es available a single event could compromise h the required rcuit and the DG. It is the intent t these SRs must stil e capable of being met, but a al performance is not requ ved during periods when thp CG is required to be OPERABLE.

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i REFERENCES None.

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gwnjg-sM 8 3.3 41 Rev. 0..Og/28/92

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