ML19253B833

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Safety Evaluation Re Air Intake Tunnel Fire Protection Sys
ML19253B833
Person / Time
Site: Crane 
Issue date: 01/20/1976
From:
Office of Nuclear Reactor Regulation
To:
Shared Package
ML19253B831 List:
References
NUDOCS 7910310585
Download: ML19253B833 (4)
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SAFETY EVALUATION BY Tl!E OFFICE OF NUCLEAR REACTOR REGUI ATION AIR INTAKE TUNT.EL FIRE PROTECTICN SYSTE" METROPOLITAN EDISON COMPANY THREE MILE ISLAND NUCLEAR STATICN UNIT 1 DOCKET NO. S0-2.9 Introduction By letter dated Nove: ber 3,1975, Metropolitan Edison Company requested that the Technical Specification Bases appended to Operating License No. DPR-50 be anended. Metropolitan Edison Cocpany (I'.ctEd) hcs determined that the Air Intate Tunnel Fire Protection System at Three l'ile Island Unit 1 (TMI-1) does not ncet the critmia specified in the Final Safety M alysis R:prrt (FSAR). Thcir subsequent analy.;is of the instn11cd fire protection system indicates that the existing system is adequate and, thus,?!ctEd has proposed that the Technien1 Specification Bases be atended to be consistent with the installed systen.

Evaluation "etEd discovered and reported that the ultraviolet (UV) detectors installed in the air intake tunnel vere not the detectors specified in the FSAR.

!!ctEd then proposed to change the Technical Specificatic:i Bases to remnin censistcnt with the installed ITl detectors since their analysis indicat.ed the installed system uns adequate.

Auteratic systens cre installed in the air intche tunnel for fire and explosion detection and suppression follcwing a hypothetical aircraft incident.

Explosion protection is prceided by a spcnini !!alon 1301 dispersig, device that is actuated by ultraviolet (UV) and/or pressure dctectors.

The detectors "see" a dcrcicping explosion and operate the !!alon suppression systen. Test data shou that an explcsion frca aircraft fuel in the air tunnel uould require 1350 millioecends (1.36 seconds) to go to completion. Desi,9 requircrents callcd for discharge of flalen 1301 c::picsion sum ression egent te be strrted within 230 nilli-seconds end cc pleted u chin 600 -d111s..cends.

7910310_ &]S 1505 139

., The detector supplier has evaluated the existing installation and concluded that the installed detector provides adequate coverage. !?e agree that the UV type detectors installed in the air intake tunnel will provide adeqttate incipient explosion detection capability.

Initiation of ihlon discharge remains below 200 milliseconds and satisfies the 250 millisecond design requirement. Time required for completion of Iblon discharge also r. r'ains below the design requi recent of 600 milliseconds.

Based on our evaluation, we concluded that the proposed Tcchnical Specification Bases change is acceptable.

Date:

January 20, 1976 1505 140

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Applics to the fire protcetion systeca protectin,the air intake tunnel.

O'o.i ec tive To provide fire protection cycters to prevent fire or explocive hydrocarton vapora catering the control building through the air intake tunnel.

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closas -nen ultrevlolet re. diction fren a fine.c or cre is present ithin the detecter cone of vicien. Parfo::- ance:

'"he d tector crrangenent with reccrd to censitivity, Spectral rccponce, end cene c,t' vinica cha.11 be ccup'.tible with the a :u11ct.tior l

perri$~ cuppresc., in that, the response tines vill be cufficiently rapid to ica and or inertiry of the < eflagratica, oc applienble.

l Dmicaive Pressure Detectors - Orcration:

!;onnally npen centact closeo V an the static pres:ure setting is exceeded.

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0-5 pai; field adjustable.

Tcrperatere detectors:

Opcration - The detectors operate when their temperature 0

reaches or er.ceeds 193 T + 100F; cnd whenever the currounding air torpertture reacheJ a ta:perature above which a fire ccnditica is concidered to exist unier all cenditiens of riter of rise ca specified by Undeuriters Laboratori.es '"m c.

Vapcr detectors: Or ration - Ionicatien type which functienc when curroz._ing cir reaches the alern cet point.

Snohe Detectors:

Ionicction type which vill respond to an alarn conditica vhen products of corbusticn are generated by a deflagration in the tunnel.

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