ML20063G707

Proposed TS Table 3.3-11, Fire Detection Instruments

ML20063G707
Person / Time
Site:	Sequoyah
Issue date:	02/09/1994
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20063G705	List: ML20063G700 ML20063G707
References
NUDOCS 9402160162
Download: ML20063G707 (8)

Text

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I i ENCLOSURE 1 l

1 PROPOSED TECHNICAL SPECIFICATION CHANGE SEQUOYAH NUCLt.xR PLANT (SON) UNITS 1 AND 2 DOCKET NOS. 50-327 AND 50-328 (TVS-SON-TS-93-21)

LIST OF AFFECTED PAGES Unit 1 3/4 3-65 Unit 2 3/4 3-64 1

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-PDR- ADOCK 05000327 P PDR- js

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,,, TABLE 3.3-11 (Continued) g . <

8 FIRE DETECTI0ft IttSTRUMENTS 1 "

I Fire Minimum Instruments Operable

' Zone Instrument'tocation* Ionization Photoelectric Thermal Infrared E

y 174 Mech. Eqpt. Rm. El. 734 1 175c Mech.'Eqpt. Rm. El. 734 1 176- 480-V Shtdn. Bd. Rm. IA1 2 El. 734 177 480-V Shtdn. Bd. Rm. 1A1 2 E1. 734

.178

-480-V Shtdn. Bd. Rm. IA2 2 El.'734 179 480-V Shtdn. Bd. Rm. IA2 2 El. 734 w 180 480-V Shtdn. Bd. Rm. 1B1 2 1- .

El. 734 w -181- 480-V Shtdn. Bd. Rm. 181 2

'a El. 734

• 182 480-V Shtdn. Bd. Rm. 1B2 3 El. 734 183 480-V Shtdn. Bd. Rm. 182 3 El. 734 7 184 6.9-KV Shtdn. Bd. Rm. A.

El. 734 7

-185 6.9-KV Shtdn. Bd. Rm. A

.El. 734 186 6.9-KV Shtdn, Bd. Rm. B.

El. 734

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. p_187 6.9-KV Shtdn. Bd. Rm. B El. 734 h

& 188. 480-V Shtdn..Bd. Rm. 2A1 2 B El. 734

' ?. 189- 480-V Shtdn. Bd. R'm. 2A1 2.

z El.-734 P 190 480-V Shtdn. Bd.'Rm. 2A2 3

- El. 734

? --.191. -480-V Shtdn. Bd. Rm. 2A2 3

. El. 734 192' 480-V Shtdn. Bd. Rm. 2B1 2 E1. /34 g

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, TABLE 3.3-11 (Continued) .

FIRE DETECTION INSTRUMENTS x

5 i FIRE MINIMUM INSTRUMENTS OPERABLE ZONE' INSTRUMENT LOCATION Photoelectric Ioniza ti_on Thermal Infrared

~t 153 Add. Equip. Bldg., El. 740.5 4

154- Add. Equip. Bldg., El. 740.5 -6 R86 155 Refuel Rm. El. 734 19 158 RB Access Rm. El. 734 2 159' RB Access Rm. E1. 734 2 160 SG B1wdn. Rm. El. 734 4 161 - SG B1wdn. Rm. E1. 734 4 162 EGTS Rm. El. 734 3 163 EGTS Rm. El. 734 3 164 EGTS' Filter A, E1. 734 1 2 10 165 EGTS Filter A, E1. 734 1 2 166 EGTS Filter B, E1. 734 1 2 Y 167- EGTS Filter B, E1.'734 1 2 3: 172 Mech. Equip. Rm., E1. 734 1 173 iiech.. Equip. Rm., El. 734 1 174 Mech. Eqpt. Rm. El. 7?- R86 1

175 Mech. Eqpt. Rm. E1.734 1 176 480-V SD Bd. Rm. lA1, El. 734 2 177 - 480-V SD Bd. Rm. 1A1, E1. 734 2 178 480-V SD'Bd. Rm. lA2, El. 734 2 179 480-V SO Bd. Rm. lA2, El. 734 2

-180 480-V-SD Bd. Rm. 181, El. 734 2 181 480-V SD Bd. Rm. 181 El. 734 2 182 480-V SD Bd. Rm. 182 E1. 734 3 b& 183 480-V SD Bd. Rm. 182 E1. 734 3 ef g@ 184 6.9KV SD Bd. Rm. A El. 734 ,7 g Et '185- 6.9XV SD Bd. Rm. A El. 734 x s' 186 6.9KV SD Bd. Rm. B El. 734 'I y" 187 - 6.9KV SD Bd. Rm. B El. 734 7

- EF 188 480-V.SD Bd. Rm._2Al E1. 734- 2 g' 189 - 480-V SD Bd. Rm'. 2A1 E1.'734 2

' g @? 190' . 480-V SD Bd. Rm. 2A2 E1. 734 3 191 -480-V SD Bd. Rm. 2A2 El. 734 . 3.

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i ENCLOSURE 2 -j I

PROPOSED TECHNICAL SPECIFICATION CHANGE '  !

i SEQUOYAH NUCLEAR PLANT (SON) UNITS 1' AND 2  ;

i DOCKET NOS, 50-327 AND 50-328 - -i

- , (TVS-SON-TS-93-21) - 1 I

i s DESCRIPTION AND JUSTIFICATION FOR  :

3 REVISION OF FIRE DETECTION INSTRUMENTATION ,

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3.' g Descrintion of Chanag '  !

TVA proposes to modify the Sequoyah Neclear Plant (SON) Units 1 and 2 technical l specifications (TSs) to add one additional ionization detector to Fire Zones 184,185,186, and 187.~ This change affects TS Table 3.3-11, " Fire Detection instruments,". for both  !

units at SON.  !

Reason for Chanag i National Fire Protection Association (NFPA) 72E requires ceiling obstructions and potential .

changes in air movement to be considered in the spacing of detectors. At SON, the ;  !

Units 1 and 2 6900-volt (V) shutdown board room corridors on Elevation 734 of the. '

auxiliary building are not within the range of coverage for the associated shutdown board  !

room detectors in accordance with NFPA 72E. Specifically, the corridor ceiling is :

separated from the general room area ceiling by a concrete beam. This could result in the .;

smoke associated with a fire in the corridor being blocknd by the concrete beam during j conditions of low air flow, such as when the general room area fans are not operational.

• Based on the NFPA requirements, TVA has added two additional cross-zone detectors in  ;

each of the Units 1 and 2 6900-V shutdown board room corridors on Elevation 734 of the auxiliary building. This modification affects the TSs for both units at SON since the fire detection instrumentation is considered to be common equipment.

l The proposed changes will ensure that SON Units 1 and 2 are in compliance with NFPA 72E code requirements.

Justification for Chanaes  !

1 The fire protection instrumentation at SON provides an early warning fire detection system to notify personnel of a fire, actuate automatic suppression systems, and control auxiliary- l equipment. The added detectors provide additional assurance that the fire detection instrumentation associated with the auxiliary building shutdown board rooms will operate l as required in the event of a fire. Specifically, the functions of the detectors that were l added to the shutdown board room corridors include:

1. Alarms in the control room and at the local fire detection alarm panel

2. Charging of the sp.ay headers for the shutdown board room ,

3. Actuation of the fire dampers in the shutdown board room 5

These functions do not directly affect electrical equipment located in the shutdown board ,

room since the spray headers will not discharge until the fusible link located at each spray header is directly affected by the heat associated with a fire.

l The changes discussed above increase conservatism through the use of additional l detectors. These changes do not affect any safety analysis conclusions because the fire '

detection instrumentation is not taken credit for in the SON design for design-basis )

accidents. In addition, the implementation of additional detectors enhances the reliability "I of the fire protection system and ensures cross-zone protection within the 6900-V .{

shutdown board room corridors. j

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Environmental Imoact Evaluation  :

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q ., The proposed change does not involve an unreviewed environmental question because the - '

j i, operation of SON Units 1 and 2 in accordance with this change would not:

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1. Result in a significant increase in any adverse environmental impact previously evaluated in the Final Environmental Statement (FES) as modified by NRC's testimony  ;

to the Atomic Safety and Licensing Board, supplements to the FES, environmental ~  ;

impact appraisals, or decisions of the Atomic Safety and Licensing Board. l 1

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

3. Result in matters not previously reviewed in the licensing basis for SON that may have a significant environmental impact.

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1: ENCLOSURE 3 I

PROPOSED TECHNICAL SPECIFICATION CHANGE 'l-I-

l^ SEQUOYAH NUCLEAR PLANT (SON) UNITS 1 AND 2 rl j --- .

• i 4- DOCKET NOS. 50-327 AND 50-328 i

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I (TVS-SON TS-93-21) i:

i DETERMINATION OF NO SIGNIFICANT HAZARDS CONSIDERATION i  !

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Significant Hazards Evaluation -

4 TVA has evaluated the proposed technical specification (TS) change and has determined that it does not represent a significant hazards consideration based on criteria established in 10 CFR 50.92(cl. The operation of Sequoyah Nuclear Plant (SON) in accordance with the proposed amendment will not:

1. Involve a significant increase in the probability or consequences of an accident ' ,

previously evaluated.

The proposed change to the fire detection instrumentation adds two additional cross-rone detectors in each of the Units 1 and 2 6900-volt shutdown board room corridors on Elevation 734 of the auxiliary building. The additional fire detection ,

instrumentation provides additional assurance that the fire detection instrumentation l will operate as required in the event of a fire. However, neither the fire detection instrumentation nor the equipment associated with this instrumentation is considered ';

to be the source of an accident. In addition, this equipment is not taken credit for in .j the safety analysis. Therefore, there is no increase in the probability or i consequences of a previously evaluated accident.

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

analyzed.

The fire detection and/or suppression functions affected by this change enhance fire mitigation functions only and do not result in a change in plant functions. Therefore, -

the proposed change does not create the possibility of a new or different kind of -

accident from any previously analyzed.

3, involve a significant reduction in a margin of safety.

The equipment functions affected by the proposed changes are not assumed for any

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accident in the SON safety analysis and are not an input to the TS margin of safety. l Therefore, the proposed change will not result in a reduction in the margin of safety, j s

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