ML20096C336

Proposed Tech Specs Changing Table 3.3-11 Allowing Use of Thermal Fire Detectors Instead of Infrared Detectors

ML20096C336
Person / Time
Site:	Sequoyah
Issue date:	08/27/1984
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20096C323	List: ML20096C321 ML20096C336
References
NUDOCS 8409050233
Download: ML20096C336 (5)

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ENCLOSURE 1 PROPOSED TECHNICAL SPECIFICATIONS SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 t

TVA-SQN-TS-58 1 B409030233 840827

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TABLE 3.3-11 (Continued)

FIRE DETECTION INSTRUMENTS [

Fire Minimum Instruments Operable Zone Instrument location Ionization Photoelectric Thermal Infrared 267 Aux. Instr. Rm. El. 685 8 268 -Aux. Instr. Rs. El. 685 9 269 Computer Rm. El. 685 4 270 Computer Rm. El. 685 4

276 ~ Intk.~ Pumping Sta. El. 690 & 670.5 15 354 Upr. Compt. Coolers, El. 778 4

352 Lwr. Compt. Coolers, El. 693 4 356- RCP 2, El. 693 2*

357 RCP 2, El. 693 2

360 'RCP 1, El. 693 2*

361 RCP 1, El. 693 2

364 RCP 3. El. 693- 2*

365 RCI 4 il. 693 2

368 RCP 4, El. 693 2*

369 RCP 4, El. 693

'2 372 Reactor-Bldg. Annulus 18

.373. Reactor Bldg. Annulus 18 1 Diesel Gen. Rm. 2B B, El. 722 5 2 Diesel Gen. Rm. 28-8, El. 722 5 3 ' Diesel Gen.-Rm. 18-8, El. 722 ,

5 4 Diesel Gen. Rm. IB-8, El. 722 5 5 . Diesel Gen. Rm. 2A-A, El. 722 .

~ 5-6 Diesel Gen. Rm. 2A-A, El. 722 5 7 Diesel Gen. Rm. lA-A, El. 722 5

.8 Diesel Gen. Rm. 1A-A, El. 722 5

• This change is effective upon completion of the associated modification.

SEQUOYAH - UNIT 1 3/4 3-66 ,

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1 296 Aux. CR this. 1-4H,~4tl, & 11B L1 732 6 N 297 Main CR Bds. El. 732 9 l 298 - Conanon MCR Bds. El 732 9 l 387~ lurbine Cont. Bldg. Wall, El. 706 18 353 Iwe.-Compt.' Coolers, L1. 693 4 355 Upr. Cuiupt. Coolers ,- f. l . 7/8 -

4 3/4 Reactor Huiltling Annulus 18 3/S Reactor fluilding Annulus- 18 362 RCP 1 L1. 69.1 2*

363 RCP 1 11. 693 2 m -358 RCP 2 11. 693- 2*

}_ 359 RCP 2 Ll. 693 2 RLP 3 L1. 693 2, m 366_ ,

j, 367 RCP 3 El. 693 2 ,

N 370 RCP 4 ll. 693 2*

371 RCP 4 Ll. 693 2 l

• This change is effective upon completion of the modification.

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ENCLOSURE 2 JdSTIFICATION FOR PROPOSED TECHNICAL SPECIFICATIONS TVA-SQN-TS-58

. Description of Change Table 3.3-11 for units 1 and 2 lists the fire detection instruments. This proposed technical specification change revises the type of detectors used in fire zones 356, 360, 364, 368 for unit 1 and fire zones 362, 358, 366, and 370 for unit 2. The new detectors will be thermal detectors. The technical specification is requested to be approved for implementation following completion.of the associated modifications.

Justification The infrared detectors have experienced a high failure rate which has been attributed to the high temperature and high radiation environment surrounding the' infrared detectors. The infrared detectors are also subject to spurious alarms caused by flashlight beams. Suitable infrared detector replacements are not available. Thermal detectors are available

- that have not adversely responded to the high radiation and high tempera-ture environment. This change in detectors will increase the fire detection system availability and reliability. Also, based on the attached significant hazards consideration determination, we have concluded that:

(1) the proposed change does not constitute a significant hazards consideration as defined by 10 CFR 50.92; and (2) there is reasonable assurance that the health and safety of the public will not be endangered

.by the proposed change; and (3) this action will not result in a condition which significantly alters the impact of the station on the environment as described in the NRC Environmental Statement.

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SIGNIFICANT HAZARDS CONSIDERATIONS 1.

Is the probability of an occurrence or the consequences of an accident c .-

increased?, evaluated in the safety analysis report significantly previously '

No. .

v Replacing the infrared flame detectors with thermal detectors

'will increase the fire detectio'n systems availability and reliability.

' Thermal detectors presently located in the same environment have not responded adversely. .

2. , Is the possibility for an accident of a new or different type than evaluated 'previously in the safety analysis report created?

No.

'The fire detection system will perform the identical function as it did prior to the modification.

3. _ Is the margin of safety significantly reduced?

I No.

d This modification and reliability. is necessary to increase the system's availability The margin of safety will not be reduced.

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