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Proposed Tech Specs Re Onsite Power Distribution
	ML19325C607
Person / Time
Site:	Byron, Braidwood, 05000000
Issue date:	10/03/1989
From:	; COMMONWEALTH EDISON CO.
To:	;
Shared Package
ML19325C606	List: ML19325C605; ML19325C607;
References
	NUDOCS 8910170109
	Download: ML19325C607 (11)
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aHACit!ERLB EROPOSED CHANGES TO APPENDI)UL

, JECHNICAL SPECIFICAIIONS OF FACILITY OPERATING LICENSE NPF-r..

E-63 NPF-72 AND NPF-77 BIROM BRAIDHOOD Revised Pagti: 3/4 8-14 3/4 8-14 3/4 8-15 3/4 8-15 1

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' I ELECTRICAL POWER SYSTEMS l

3/4.8.3 ONSITE POWER DISTRIBUTION i

- OPERATING .

1 LIMITING CONDITION FOR OPERATION !

3.8.3.1 1he following electrical busses shall be energized in the specified !

manner for the applicable unit:. -

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a. A.C. ESF Busses consisting of:

UNIT 1 UNIT 2 l Division 11 Division 21 !

1) 4160-Volt Bus 141, 1) 4160-Volt Bus 241 g 2) 480-Volt Bus 131X, and I:) 480-Volt But- 231X, and !

3) 480-Volt Bus 1312. 3) 480-Volt,8us 2312.

b. A.C. ESF Busses consisting cf:

UNIT 1 UNIT 2 :

Division 12 Divistoi) 22 j

1) 4160-Volt Bus 142 1) 4160-Volt Bus 242

2) 480-Volt Bus 132X, and 2) 480-Volt Bus 232X, and [,

3) 480-Volt Bus 132Z. 3) 480-Volt Bus 2321. s

c. 120-Yolt A.C. Instrument Bus 111 for Unit 1 (Bus 211 for Unit 2) ;

energized from its associated inverter connected to D.C. Bus 111 for ;

, Unit 1 (Bus 211 for Unit 2), i

d. 120-Volt A.C. Instrument Bus 113 for Unit 1 (Bus 213 for Onit 2) energized from its associated inverter connected to D.C. Bus 111 for i Unit 1 (Bus 211 for Unit 2),

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e. 120-Volt A.C. Instrument Bus 112 for Unit 1 (Bus 212 for Unit 2) energized from its associated inverter connected to D.C. Bus 112 for :

Unit 1 (Bus 212 for Unit 2), and f.

120-Volt A.C. Instrument Bus 114 for Unit 1 (Bus 214 for Unit 2) energized from its associated inverter connected to D.C. Bus 112 for Unit 1 (Bus 212 for Unit 2). -

l APPLICABILITY: ' MODEL 1, 2, 3, and 4.

ACTION:

a. With one of the required divisions of A.C. ESF busses not fully energized, reenergize the division within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months or be in at least r HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With one A.C. instrument bus either not energized from its associated inverter, or with the inverter not connected to its associated D.C. <

bus: 1) reenergize the A.C. instrument bus within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN ,fl within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months , antt 2) reenergize the A.C. instrument Vi bus from its associated inverter cennected to its associated D.C. bus within e aurr yor be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in" COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

@) t ed &monsfrde CvT249 wry of :Ae retwhd A C 5wrus w.M 24 lu. ors and ed forst mee per- 0 hours0 days 0 hours 0 weeks 0 months 3/4 8-14 6eredter hy /dr4_, spe4ca do4.r BYRON - UNITS 1 & 2

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. ELECTRICAL-Psi?J SYSTEMS J. SURVEILLANCE PEQUIREMENTS ;

4.8.3.1.1The specified busses shall be determined energized in the required manner at least once per 7 days by verifying correct breaker alignment and ,

indicated voltage on the ESF busses. '

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ELECTRICAL POWER SYSTEMS i 3/4.8.3 ONSITE POWER DISTRIBUTION OPERATING !

LIMITING CONDDION FOR OPERATION l

3.8.3.1 The following electrical busses shall be energized in the specified l manner for the applicable viit: i

a. A.C. ESF Busses consisting of- !

UNIT 1 UNIT 2 Division 11 Division 21 !

1) 4160-Volt Bus 141, 1) 4160-Volt Bus 241 ;

2) 480-Volt Bus 131X. 2) 480-Volt Bus 231X. !

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b. A.C. ESF Busses consisting of:

UNIT 1 UNIT 2, !

Division 12 Division 22 i

1) 4160-Volt Bus 142 1) 4160-Volt Bus 242 i

2) 480-Volt Bus 132X. 2) 480-Volt Bus 232X.

c. 120-Volt A.C. Instrument Bus 111 for Unit 1 (Bus 211 for Unit 2) l energized from its associated inverter conaected to D.C. Bus 111 for '

Unit 1 (Bus 211 for Unit 2),

d. 120-Volt A.C. Instrument Bus 113 for Unit 1 (Bus 213 for Unit 2) !

energized from its associated inverter connected to D.C. Bus P2 for l Unit 1 (Bus 211 for Unit 2), .. ;

e. 120-Volt A.C. Instrument Bus 112 for Unit 1 (4us 212 for Unit 2)

L energized from its associated inverter connected to D.C. Bus 112 for Unit 1 (Bus 212 for Unit 2), and '

Y. 120-Volt A.C. Instrument Bus 114 for Unit 1 (Sus 214 for Unit 2) !

energized frca its associated inverter connected tu D.C. Bus 112 for '

Unit 1 (Bus 212 for Unit 2). l APPLICABILITY: MDDES 1, 2, 3, and 4.

ACTION _:

a. With ona of the required dirisions of A.C. ESF busses not fully -

energized, reenergize the division within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months or be in it least H0T STANOBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

t;. With one A.C. instrument bus either not energi .d from its associated L inverter, or with the inverter not connected to its associated D.C.

bus: 1) reenergize the A.C. instrument bus within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in l at least HOT STANDRY wf thin the next F hours and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months , and 2) reenergize the A.C. instruneent .

bus from its associated inverter connected to its associated D.C. bus within hourscor he in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in OLD SHUTD0hil)within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

%d awrate cwtsoj y et se rega,4d 4.c.

@ .5 ouren wa N 24 h o"'a oc a 1 /ec t on e e. pe1 -

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l ELECTRICAL POWE2 SYSTEMS .

I., SURVEIU ANCE REQUIREMENTS i

4.8.3.1.1The specified busses shall be deters' ed energized in the required l :

mannet at 'twait once per 7 days by verifying correct breaker alignment and I indicated voltage on the ESF busses. ;

4.8. 3.1, 2 ff< f U -vit A C. 555 sis enceyasny Ue afkcTed' Go*nk l lC. l c/rament hv.s slia.H be cedermmed energ i ed in' he regsdd Atuncr~ by 6'erllyty corretI bWNtr aljnwnY and /ndNaAed Voltye- on the ctstoc<aTrcl -//40 ~ m/t o<x/ p'go~ & d 6" M - f l8 3. /. 3 Th'e dN i c e' ud2lbcdc/ 20- yo/t A C. ins %menf- f,,ug . .

5lh!/ be Adermined e<1eryizy fem an OM'9& E imergee b) l'erthij dorrect dveu4r a /j.nment oi?o' InNcAWW roNetc' '

on k' assoch&c/ Esf and' /25-Volt L). C. Agc. '

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l ATTACHMMLC LVAludilotLDLSIGNIFICANT HAZARD CORSlDIFAUORS l l'

Commonwealth Edison has evaluated this proposed amendment and has :

determined that it soes not involve a significant hazards consideration. :

According to 10 CFR 50.92(c), a proposed amendment to an operating license involves no significant hazards considerations if operation of the facility in accordance with the proposed amehdment would not: !

1. Involve a significant increase in the probability or consequences of an accident piaviously evaluated; or

2. Create the pcssibility of a new or different kind of accident frm any accident previously evaluated; or

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

The nroposed amendment requests a change which involves revising Technical Specification 3/4.8.3.1 to increase the allowed action time from 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months to 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months Mr an AC instrument bus te be disconnected from its associated inverter. Two additional surveillance requirements (4.8.3.1.2 and '

4.8.3.1.3) are proposed. Surveillance 4.8.3.1.2 will verify that the 480 VAC ;

ESF bus supplying the constant voltage transformer is energized in the ,

required manner within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter.

Surveillance 4.8.3.1.3 will verify that the other three instrument busses are tnergized from an OPERABLE inverter within the same time period. This amendment is requested to allow sufficient time to fully troubleshoot and repa!r failed inverters and to provide sufficient time for preventive maintenance to be performed on operable inverteis while in modes 1 through 4.

The proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.

Increasing the action time to allow one 120 VAC instrument bus to be energited from its associated constant voltage transformer from 24 houts to 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months does not significantly increase the probability of an accident previously evaluated. The loss of a single 120 VAC instrument bus is not in itself an l initiating event in any cf the accidents presented in Chapter 15 of the FSAR.

I With one of the instrument busses on its constant voltage transformer instead of its associated inverter there is some loss of redundancy in bus power supplies due to the loss of feed from the inverter to the 125V DC bus. This

! lots of redandancy may result in an increased probability of a spurious l reactor trip and/or safety injection, and loss of one train of ESF output relays. It is felt that this increase is not significant dua to the following:

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1. The 480 VAC ESF bus is a very reliable source of power to the constant i voltage transformers. The 480 VAC ESF bus receives power fr m the 4.16kV :

, ESF hus which in turn is capable of receiving power 6 m the Unit ;

Aux 111ary, Transformer (UAT), Station Aux 111ary 7:ensformer (SAT), the emergency diesel generator and the SAT of the opposite unit. -

2. The constant voltage transformer is a reliable piece of equipment classified as Safety Category I (Class IE) and is required for safe shutdown. The failure probability of the constant voltage transformer, ,

while not quantified, is considered to be small. This is substantiated by !

the fact that no failures have occurred on any of the sixteen constant i voltage transforme.s installed on Byron and Braidwood Units 1 and 2. This was determined based on a review of the Nuclear Plant Reliability Data ,

System.

3. Two surveillances 4.8.3.1.2 and 4.8.3.1.3, have been proposed to ensure ;

the reliability of the three unaffected instrument busses and the instrument bus on the constant voltage transformer. -

Also, it should be noted that the Allowable Outage Time is only being ,

increased when one redundant power supply to an instrument bus is out-of-service. There are three additional instrument busses (while not totally redundant they have several overlapping capabilities) that would remain operable in accordance with Specification 3.8.3.1.

Increasing the action time to allow o'ie 120 VAC instrument ha to be energized from its associated constant voltage transformer from 24 f.ours to 71 .

hours does not significantly increase the consequences of an accident previously evaluated. The current Technical Specifications (3/4.8.3.1) and the FSAR (Section 15.0.1.1) allow operation with the inverter out-of-service for 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . Extending this period to 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months will not alter the plant .

response to a loss of a 120 VAC instrument bus should the constant voltage '

transfoimer fall while supplying the instrument bus. Off normal procedures r have already been developed and would be used by the operators to address this situation.

The proposed change does not create the possibility of a n o or different kind of accident from any accident previously evaluated. ,

Increasing the action iime to allow one 120 VAC instrument bus to be energized from its associated constant voltage transformer from 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months to 72 hoars will not create any new modes of plant operation beyond those normally performed. The proposed change does not involve a modificat! a to currently installed systema or equipment or require operation in a man n different from that currently allowed. The constant voltage transformer is designed for continuous operation so the extended action time is within design limitations. <

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The change is administrative in nature and as such it has no impact -

[' on the accident analysis from the standpoint of the possibility of creating a new or different kind of accident from any accident previously evaluated.

.[ The proposed change does not involve a significant reduction in a t margin of safety. ,

o Previously evaluated accidents demonstrate margins of safety. These accident analyses are based on the availability of a minimum set of safety equipment and do not take into account allowable outage times for equipment.

Therefore, there is no margin of safety associated with allowable outage times. .

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s ENVIRONMENTAL ASSESSMENT Commonwealth Edison has evaluated the proposed amendment against the (

. criteria for and identification of licensing and regulatory actions requiring l l environmental assessment in accordance with 10 CFR 51.21. It has been I determined that the proposed changes meet the criteria for a categorical !

exclusion as provided for under 10 CFR 51.22(c)(9) and (10). Following is a .

discussion of the changes and how they meet the criteria for categorical exclusion.

The change to Specification 3/4.8.3.1 increases the action time allowed for an A.C. instrument bus to be energized from a source other than ;

from the inverter connected to its associated D.C. bus from 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months to 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months . . Two additional surveillances, 4.8.3.1.2 and 4.8.3.1.3, have been added for verification of energization of the affected instrument bus from the 480 VAC bus supplying its constant voltage transfer and verification of energiza-tion of the three unaffected busses from their inverters, respectively. This does not involve a change in the use of a facility component located in the t restricted area.

The preceding change does not involve a significant hazards .

consideration as discussed in Attachment C of this letter. Also there is no significant change in the types or significant increase in the amounts of any i effluents that may be released offsite since this change does not affect the '

generation of any radioactive effluents nor does it affect any of the permitted release paths. Finally, the change does not involve a significant ,

increase in individual or cumulative occupational radiation exposure.

Therefore, this change meets the categorical exclusion permitted by 10 CFR

- 51.22(c)(9).

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ML19325C607

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