ML20091F591

Proposed Tech Specs,Revising Actions for TS Table 3.3-3

ML20091F591
Person / Time
Site:	Sequoyah
Issue date:	11/27/1991
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20091F581	List: ML20091F578 ML20091F591
References
NUDOCS 9112090162
Download: ML20091F591 (12)

Text

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

+

LNCLOSURE 1 PROPOSED TECHNICAL SPECIFICATION CHANGE SF9UOYAH NUCLEAR PLANT UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVA-5 QN-IS-91 -16 )

LIST OF AFFECTED PAGES Unit i 3/4 3-21 3/4 3-23 Unit 2 3/4 3-21 3/4 3-23

=

91120-s0162 911127 PDR ADCiC K 030003':7 P POR I .. . . . .

l v.

m

@ TABLE 3.3-3 (Continued) 5 o I ENGINEERED SAFETY FEATURE ACTUATION SYSTEM INSTRtNENTATION E -

i MINIMUM j TOTAL NO. OiANNELS

,i $,TUNCTIONALUNIT

._ OF CHANHELS TO TRIP CHAT #iELS APPLICABLE OPERABLE M3 DES

- 7. ACTION LOSS OF POWER

a. 6.9 kv Shutdown Board

--Loss of Voltage

1. Start Diesel 1 2/ shutdown 1 loss of 2/ shutdown Generators board voltage on 1, 2, 3, 4 -GG1 3f #

f board any shutdown board

2. Load Shedding M*

2/ shutdown 1/ shutdown 2/ shutdown 1, 2, 3, 4 #

1

b. 6.9 Ev Shutdown Board Degraded Voltage board board board (WM

1. Voltage Sensors 3/ shutdown 2/shutcown 2/ shutdown board board board 1, 2, 3, 4 -298 3/5

2. Diesel Generator 2/ shutdown 1/ shutdown 1/ shutdown Start and load board board I, 2, 3, 4 -29*- 39 4 Shedding Timer board

3. SI/ Degraded 2/ shutdown 1/sbutdown Voltage Enable board board 1/ shutdown I, 2, 3, 4 # J'/ #

gT Tir er board kd 8. ElGINEERED SAFETY FEATURE ACTUATION SYSTEM INTERLOCKS

1. a. Pressurizer Pressure - 3 2

,g ,5 P-11/Not P-11 2 I , 2, 3 22a ,

$w

b. Deleted gi43 '

~

c. Steam Generator 3/ loop M Level P-14 2/ loop 3/ loop 1. 2 w 22c a

any loop b

1 RI45

4 l

l i

TABLE 3.3-3 (Continued)

ACTICN 21

• With less than the Minimum Number of Channels CPERABLE, declar with the ACTICN recuirements of Specification 3.7. .'

ACTION 22 -

With less than the Minimum Number of Channels CPERABLE, declar the functions Itsted below are OPERABLE or ap ACTION statement evaluated are: (s) for those functions.Functions to be

s. Safety Injectio7 -

Pressurizer Pressure Steam Line Pressure Negative Steam Line Pressure Rate

b. Deleted, R145 l

c. Turbins Trip  !

Steam Generator Level High-High Feedwater Isolation Steam Generator Level High-High ,

ACTION 23 - ,

n, With the number of OPERABLE channels one less than th Number of Channels, be in at least HOT STANOBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> however, one channel may be bypassed for up to 2 h for surveillance testing oer Specification 4.3.2.1.

ACTION 24 -

With the -number of OPERABLE channels one less than the Number of Channels, restore the inoperaDie channel to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least HOT'ST within following66hours hours, and in at least HOT SHUTDOWN within the ACTION 25 -

With the number of CPERABLE channels one less than the Number cf Channels, restore the inoperable c'ennel to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or declare the-associa.ad valve inoperable a,

take the ACTION required by Specification 3.7.1.5.

- (L bbb "?ilou

~

< I.NtitR.T 55

• b--b-

..itn-the number of OPERABLE channels one less than.the Total Nurber of Channels STARTUP and/or POWER OPERATION may proc provided the-following conditions are satisfied:

a. R145 1 The inoperable within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. channel is placed in the tripped condition

b. t For ~the af fected protection set, the Trip Time Delay for one.affected steam generator _(T S

) is adjusted to match the Trip Time Delay for multiple affected steam generators (TM ) within 4 hcurs.

s SEQUOYAH - UNIT 1 3/C 3-23 h4/(Y 161530 Amendment-No. 12, 63, 129. 141

......__.._-. t ,;

%. ..~ ~ _.- , __ ...___..m._.-._,.__,--..,,_...,,,,,_--r.m..,.m_ -

INSERT A ACTION 34'- a. With the number of OPERABLE channels one less than the Total Number of Channelc, restore the inoperable channel to OPEPABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at Icast HOT STANT'BY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SilUTOOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

b. With the number of GPERALLE channels less than the Total Number of Channets by more than one. declare the associated 6,700-volt shutdown board inoperable, and comply with the action requirements of Specification 3.8.2.1 or 3.8.2.2 as applicable.

ACTION 35 - With the number of OPL'.ABLE channels. less -than the Total Nu:abt:-of Channelo by one or more, declare the associated diesel generator set i+toperable, and comply with the action- requirements o.! Specification 3.3.1.1 or 3.8.1.2 as applicable.

l

~.

.rW%,s J. .

1 vs TABLE 3.3-3 (Continued)

. E ENGINEERED SAFETY FEATURE ACTUATION SYSTEM INSTRUMENTATIGN -)

8

>- MINIMUM x '

i

' TOTAL NO. CHANNELS CHANNELS APPLICABLE FUNCTIONAL UNIT OF CHANNELS TO TRIP [

OPERABLE MODES ACTION f '

'Z . 7.' LOSS OF POWER '.  !

RI32

}

a. 6.9 kv Shutdown Board  ;

--Loss of Voltage I l

1. , Start Diesel 2/ shutdown- 1 loss of 2/ shutdown j' Ge..erators - board' 1, 2, 3, 4 , -208-355 '  !

voltage on board +

any shutdown l i

l board

! 2. <

Lead Shedding 2/shutdewn 1/ shutdown 2/ shutdown \

i" R board 1, 2, 3, 4 -fe*- 31' '

• board board i LI8 l

Y b. 6.9 kv Shutdown Board l O Degraded Voltage /

, y i

1. Voltage Sensors 3/ shutdown 2/ shutdown 2/ shutdown 1, 2, 3, . -fe ,34 *

i. board board board i

t

2. Diesel Generator 2/ shutdown 1/ shutdown 1/ shutdown

! Start and Load board board 1, 2, 3, 4 34

• board l Shedding Timer i 3. SI/ Degraded 2/ shutdown 1/ shutdown

)

1/ shutdown 1, 2, 3, 4 34&

. > Voltage Enable. board board board 3 Timer r

{ OE Oa

• I  !

_ .2 w '

i m

• 5  !

RI32 4

I~I ,

,. M' i b. l

. . . -t q

'fV

4 TABLE 3.3-3 (Continued) -

(

ACTION 21 - With less than the Minimum Number of Channels OPERABLE, declare the associated auxiliary feedwater pump inoperable, and comply with the ACTION requirements of R116 Specification 3.7.1.2.

ACTION 22 With less than the Minimum Number of Channels OPERABLE, declare the interlock inoperable and verify tht.t all affected channels of the functions listed below are OPERABLE or apply the appropriate ACTION statement (s) for those functions. Functions to be evaluated are:

a. Safety Injection Pressurizer Pressure Steam Line Pressure Negative Steam Line Pressure Rate R132

b. Deleted ,

c. Turbine Trip Steam Generator Level High-High Feedwater Isolation Steam Generator Level High-High ACTION 23 -

WiththenumberofOPERABLEchannelsonelessthantheTotaldk Number of Channels, be in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in at least HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; however, one channel may be bypassed for up to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for RSS surveillance testing per Specification 4.3.2.1.1.

ACTION 24 - With the number of 0PERABLE channels one less than the Total Number of Channels, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in at least HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

ACTION 25 - With the number of OPERABLE channels one less than the Total Number of Channels, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or declare the associated valve inoperable g and take the ACTION required by Specification 3.7.1.5.

' aLTIUtt With the number of OPERABLE channels one less than the Total Number of Channels. STARTUP and/or POWER OPERATION may proceed provided the,following conditions are satisfied;

a. The inoperable channel is placed in the tripped condition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. R132

b. For the affected protection set, the Trip Time Delay for one affected steam generator (T S

) is adjusted t6 match the Trip Time Delay for multiple affected steam generators (T g) within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

1 SEQUOYAH - UNIT 2 3/4 3-23 Amendment No. 55, 116, 132 nv vv, l

INSERT A ACTION 34 - a. With the number of OPERAPLE channels one less than the Total Number of Channels, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least l!0T STANDEY tithin the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />,

b. With the number of OPERABLE channels less than the Total Number of Channels by more than one, declare the associated 6,900 volt shutdown board inoperable, and comply with the action requirements of Specification 3.8.2.1 or 3.8.2.2 as applicable.

ACfl0N 35 - With the number of OPERABLE channels less than the Total Number of Channels by one or more, declare the associated diesel generator set inoperable, and comply with the action requirettents of Specification 3.8.1.1 or 3.8.1.2 as applicable.

] .'

ENCLOSURE :

PROPOSED TECHNICAL SPECITICATION CHANGE l SEQUOYAH NUCLEAR PLA'iT UNITS 1 AND 2 l

DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-91-16)

DESCRIPTION AND JUSTIFICATION FOR REVISION OF ACTIONS FOR TABLE 3.3-3 1

j .- ,

t:

l 1

L f a -*4 + +M" -&-w +eww g rtmem'i'+n -mt*w*r-whr m.rtiwweeyeb---y ,-p pe+ y mya- - + + - -W(-m.- +-Mar -- ebde- + m m ( > p w e- y='q eg--W-'t e-wa wTe ywe-yy W"pr-w pi,-,'-my ima v ,aag-e we-

i Description of Change ,

7 i

TVA proposes to modify the Sequoyah Nuclear Plant (SQN) Units 1 and 2 Technical Specifications (TSa) to revise the required actions f or inoperability of loss of power instrumentation in item 7 of Table 3.3-3. ,

This change adds two new actions (34 and 35) to Table 3.3-3. Action 34 l addresses actions for 6.9-kilovolt (kV) shutdown board load shedding and j deBraded voltage instrumentation inoperability. The "a" portion of this action is for operable channels one less than the total number of channels  !

- and has not changed from Action 20, which presently applies. Hnwever, the "b" portion of the proposed Action 34 for operable channels more than one less than the total number of channels allows continued operation provided the associated 6.9-kV shutdown board is declared inoperable and the actions of TS 3.9.2 1 or 3.B.2.2 are conplied with. Action 35 addresses a:tions for 6.9-kV shutdown board diesel ger.erator (D/G) start instrumentation inoperability. This action requires declaring the associated D/G inoperable and complying with the- actions of TS 3.8.1.1 or 3.5.1.2 f or one or mere operable channels less than the total number-of channels.

Reason _for_ Change The requested changes are needed for the following reasons and were identified by Operations personnel when they pointed out that literal reading of the requirements appear to require TS 3.0.3 entry f or TS testing. .

The existins Action 20 of Table 3.3-3 does not adequately provide for TS testing of the loss of power = instrumentation. .The test switches and test blocks provided for testing purposes do not have the capability to disable only one channel and perform all the required testing without actuating engineered safety features (EST) unnecessarily. To perform all required TS testing with only one channel inoperable, multiple wire lifts and jumpers would be required with significant potential for the inadvertent actuation of ESF equipment. Additionally, design changes to provide circuitry to allow testing under this action would be very complex, expensive, and could create test performance sequences that could also challenge ESF actuations.

The proposed change to add Actions 34 and 35 to Table 3.3-3 f or-loss of power instrumentation will allow performance of required TS testing with'n the allowed actions of the equipment directly affected by the instrumentation inoperability.

Justit ication for Change The loss of power _ instrumentation provides detection of loss-cf-voltage or degraded voltage at the 6.9-kV shutdown-boards. These instruments initiate load shedding for the shutdown board and initiate the start of_the D/Gs.

SQN utilizes a two out of three logic for degraded voltage identification

'that~ actuates two parallel and redundant sets of timers and relays.- Tho ,

-ability to verify the functions of the voltage sensors.without initiating load shedding is not available with test switches and blocks unless both sets of timers and relays are disabled. For D/G start instrumentation, the single test switch provided also disables all channels that would' initiate a loss-of-voltage start _ signal. Because of these system configurations, TS-required testing cannot be performed without multiple wire lifts and jumpers, which would significantly increase the patential for inadvertent

_D/G_ starts or shutdown board load shedding.

2-The requirements of Action 20 require returning an inoperable channel to  !

operable status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> with one less than the total number of channels' operable or initiate unit shutdown. For more than one channel inoperable, the action does not apply, and the requirements of TS 3.0.3 would be applicable to require an expedited shutdown on the unit. The shutdown boards and D/Gs that this instrumentation supports are the only devices affected by their ittoperability. Therefore more than one or all channels inoperable cannot be any more limiting than the loss of a shutdown ,

board or a D/G. For this reason, the application of TS 3.0.3 is overly restrictivet the TSs for the equipment affected already provide acceptable ,

action statements to ensure safe operation of the unit for more than one ,

inoperable. loss of power instrumentation channel. The proposed revision

requires declaring the shutdown board inoperable for more than one load shedding or degraded voltese channel inoperable and maintains the existing action for only one channel inoperable. For tt:e D/G. the inoperability of any loss of power start channel would require declaring.the D/G inoperable and complying with the associated actions. These changes are acceptable >

because the accident mitigation equipment (i.e., shutdown boards and D/Cs) that can be affected by this instrumentation inoperability is the crimary tafety concern, and complying with the actions for its inoperability will maintain safe operation of the unit. {.

Therefore, the proposed revisions are acceptable from a nuclear safety ,

standpoint based on the above discussions. The Actior 20 changes that create the new Actions 34 and 35 ensure the application of actions for the equipment affected by the loss of power instrumentation when multiple inoperabilities occur and prevent unnecessary TS 3.0.3 entries to perform ,

TS-required testing. .

Environmental Impact Evaluation The proposed change request revises the required actions for inoperability of ESF-instrumentation, but will.-not alter the operation or functions of any system and will not impact the environment. Therefore, this change does not involve an unreviewed environmental question because operation of SQN-Units 1 and'2 in accordance with this change would nott- ,

1. Result in a significant increase in any adverse environmental impact previously evaluated in the Final Environmental Statement (FES) as modified by the staff's testimony to-the Atomic Saiety and Licensing Board. supplements to the FES, environmental impact appraisals, or decisions of the Atomic Safety and Licensing Board.

2. Result in a significant change in effluents or revcr levels.

3.' Result in matters not previously reviewed !n-the_ licensing basis for SQN that may have a significant environmental impact.

t

@ 1Wt5 T- p- F W 4 'T 3 *tc--^7i.'emtsy *==M ewe --i vgW y - w T 3 qs e-g * '

• o 4

s

• Enclosure 3 i PROPOSED TECHNICAL SPECIFICATION CHANGE l SEQUOYAH NUCLEAR Ff. ANT UNITS 1 AND 2 .i i

DOCKET NOS. 50-327 AND 50-328 (TVA-SQN-TS-91-16) t DETERMINATION OF NO SIGNIFICANT HA2ARDS CONSIDERATION  :

1 h

l i

i V

l.

l l!

l' l.

l i.

..=..

s - , , , . , . - - . . , - , ~ s,., y--~-.w-,- , , . , - . -c.-.-,--y,--.--a .,-,-,,,---,--nm.r-e,---- .,,.-,,,,-n.w1,,vn,.-s.,e,._r.-,-...,v.,,,,,,wa .- - ,w,- ,. - ~ + ,,e, aw-' --x,cwew -

i i

Significant Hazards Evaluation

- TVA has evaluated the proposed technical specification (TS) change and has determined that it does not represent a significant hazards considera".lon based on criteria established in 10 CFR 50.92(c). Operation of Sequoyah Nuclear Plant in accordance with the proposed amendment will nott

-1, involve a significant increase in the probability or conbequences of an ,

accident previously evaluated.

The changes to existing-TS Table 3.3-3 action requirements for loss of power instrumentation that creates the new Actions 34 and 35 only affect the requirements for instrumentation inoperability. These actions do not-alter plant _ configurations for accident mitigation equipment, but l provide _ acceptable time requirements for inoperability and provide for 7 instrumentation conditions that are consistent with plant design. The revised actions will not disable safety-related instrumentation cutside of the TS requirements for the associated accident mitigation equipment or allow inappropriate inhibits to safety functions and, therefore, will not significantly increase the consequences of an accident. The functions of the instrumentation remain the same; only the actions for inoperability are modified. The proposed' changes to these TS actions do ,

not alter plant equipment configurations such that the potential for an accident is impacted. The affected instrumentation and associated '

equipment are utilized for. accident mitigation and are not considered to be the source of any. accident. Therefore, the probability of an

• accident previously evaluated is not increased. -

2. Create the possibility of a new or different kind of accident from any previously analyzed.

As discussed above, only accident mitigation equipment is affected by ,

the proposed changes. .The equipment functions have not been alteredt l only the actions for inoperability have been modified to allow TS-rcquired testing. Therefore, no equipment postulated to create an accident is impacted, and the possibility of a new or different kind of accident is not increased.

3. Involve a significant reduction in a margin of safety.

-These proposed changes do not alter the functions of any safety-related equipment. All accident; mitigation functions will remain the same, and actions for inoperableL instrumentation will provide for TS-required tes ting. . This will alicw1for operability testing of equipment used to mitigate. accidents to ensure margins of safety.are not impacted _The .  ;

changes to the actions for inoperable loss of power instrumention are

• still consistent with the actions for the associated equipment.

Therefore, a significant reduction in any margin of safety it not involved as a result of-the-proposed changes.

> ' + + N, as r- ,-..-m-r y -w:,-..%n, . *,ypw-+9T+,.- p. c , , y w -c -e y w,----