ML19208A797
| ML19208A797 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/31/1979 |
| From: | Herbein J Metropolitan Edison Co |
| To: | Jay Collins NRC - TMI-2 Operations/Support Task Force |
| References | |
| GQL-1132, NUDOCS 7909170485 | |
| Download: ML19208A797 (10) | |
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August 31, 1979 GQL 1132 D1I-2 Support Attn: Jchn T. Collins, Deputy Director U.S. ?;uclear Regulatory Co=::lission c/o "'hree Mile Island IIuclear Station Middletevn, PA 17057 1
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50-320 Fire Protection 'dodifications
..n es;cnse to your le.tter dated Aug :st 21, 1979 to '4r. E. C.
- ..1011, the f',ce prctection conditions described therein have been reviered and the
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Tne cc bustible loading in the vicinity of 9.e ' ziliary and Fuel 22ndling 3uildings exhaust.'.lters was incr esse d
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Four additional fire extinguishers wit'..,/3/C ratings have been located in areas ad,j1 cent to the f_lter 2nics aa r
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The existing procedure for valve position of the fire protection syste= for the condenser exhaust filters has been reevaluated by the architect engineer, Burns and Roe, with an engineering judgement that the =anual valve on the filter housing can be maintained Iceked opened. The valves associated with their unit are being added tc the surveillance precedure $0 =cnitor
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- a September 3, 1979 3 urns and Ece has been requested to provide engineering' support by Septe=ber 7,1979 for installation of a fire protection alar = in the centrol rocs for the condenser exhaust filter syste=.
It is estimated that this installation vill be ec=pleted by Septe=ber 21, 1979 3
The state =ent that it requires operation of five manual valves to activate a fire suppression syste= for each unit of the Auxiliary Building tack-up exhaust filters is incorrec*.
Cne manual valve must be opened and the deluge valve tripped to actuate a unit's protection.
The four valves identified in your letter are believed to be the irain valves for each unit.
yire 3r4 gade sulletin #5 (attached) vas presulgated en August s,
1979 describing the actions required to activate this fire protection system and ir typical of how fire brigade cu.d."'aa..d n' A d.4 * '.c ' ' ' v,
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operaticns and fire brigade personnel vill receive training on
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Valve position and ope ability vill be included in the surveillance
' testing progrs= by Septenber 3, 1979 k.
Section 9.5 of Supplement #2 to the Uni: II Safety Evaluation Report required hat adiiticnal in-plan: hose stations te installed to reach any plant location in safety-related areas, and other areas containing major fire hacards vich at least one effective hose strea=.
yurther, in the design features of a proposed autecatic water suppression system in the basenent of each diesel generator, we agreed to install separate sprinkler sys t ems.
The hose reel and sprinkler systen modificaticns, a,,
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o Burns and Ece specificaticn is attached and deacribes the locations y
selected for the additicnal hose reels. We vill evaluate the feasibility of installation of these reels with the present plant conditiens by Septe=ber 7,1979 Grinnell has been asked to provide a schedule for the installatien of the hose reels
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hose reel installatica (if any are put en ho d becauce of radiation expcsure considerations) will be held as an open ite for consideration and installation as plant ceniiticns permit sq
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~4e vill also develope a schedule by :!ovember 1,1979 for the installation of fire door supervision and locking to satisfy the only other remaining open fire protection ite: 'n the Safety Evaluation ?eport. The same criteria concernirg radiation exposure censideratiens for the installation c:' the hose reels vill be used it. scheduling the fire door modifications. Un00mpleted fire door codifications vill be held as an open item for installation as plant conditions permit.
Sincerel'/,
/s/ J. G. Herbein J. C. :ierbein Vice President Nu:'.er_r Operaticn
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E:!CLCSURE 1 Subject Fire Brigade Bulletin #5 - Auxiliary and Fuel Location TMI Nuclear Station Handling Bldg - Supplementary Air Filtering Middletown, PA Date 9 August 1979 System To M J. Ross J.R. Floyd The following information should be passed on to the member: of the Fire Brigade via the Shift Supervisors.
This air filtration system utilizes combustible charcni filters to remove radioactivity in the exhaust from the Auxiliary and Fuel Handling Bldgs.
The system is divided into four separate filter trains.
The hazards associated with this system are:
1.
Combustible charcoal 2.
electrical hazards 3.
radioactive material in filter beds 4.
contaminated water from fire fighting Charcoal:
Extinguishing agents: water from fixed deluge., Charcoal filters use a pe tdered form oi charcoal from processed coconut shells.
The material ho; a nigh surface area to mass ratio and since it is organic, is sus-ceptible to spontaneous combustion af ter being wetted during fire fighti g.
Spontaneous combustion can also occur as the result of decay heat from ti.a isotopic decay of iodine (This would require a tremendous amount of iodine).
The heaters also provide an ignition source if they malfunction.
Once water has been used on the filters, the wetted charcoal should be
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removed from the housings, following HP guidelines, for storage in metal cans outside the plant.
Electrical:
This system has its cwn switchgear in a separate switchgear building on the south end of the Auxiliary Building roof.
Four smaller buildings on the roof house air monitors. Two 20# C0 extinguisher 5 are in the switchgear buil di ng.
Eachairmonitorshelter$asone20#C0., extinguishers.
Dry chemical extinguishers are mounted on the filter h6usings; ':ne on the north platform, one at the center and one on the south platform.
Substations USS2-38 and USS2 a8 in the switchgear enclosure supply pcwer to'the fans and heaters.
These substations are supplied from 4160V buses 2-3 and 2-4.
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Two 480V (PDP-5A + 5B) and two 120V (MP-2-38 and 2-48) distribution panels are near the unit substations. These power supplies should be secured for an electrical fire.
Accessibility:
The Auxiliary Building roof may be reached from inside the plant however, these routes require passing through radiation and ccntamination control areas.
The roof is also accessible by scaffolding from grade level outside the Unit 1/2 hallway.
The deluge valve station is mounted on the south end of the east outside wall of the Fuel Handling Building..This valve station can be reached by going around the filter units or by going under the south units if not involved in the fire.
Contamination Levels:
The filte units could be very highly contaminated and therefore represent an exposure problem to the fire brigade and to the public if a release occurs as a result of a fire.
Quick response to high temperature alarms minimize these possibilities.
If tne rewoc.se detects a fire, HP monitoring will be necessary for-tne brigade and to track a possible release.
Water from Fire Fichtina:
Water should or.ly be applied using the deluge system for a 5 minute period during which period extinguishment should occur.
If water application is continued, the filter housings could flood and contaminated water leak from gasket joints or back into the ventilation system.
Draining water frem fire fighting requires manually opening the drain valves for the housing involved. Valve FS-FB-V-1 on top of the drain tank will automatically close when the level in the tank reaches 1900 gallons (power must be restored to the valve if the entire substation was de-energi~ed). HP should be consulted prior to any draining.
Installation:
Fire Service water is supolied to the Auxiliary Building roof through FS-FGV-4 located at the fire service manifold 305' Turbine Building north.
FS-FGV-4 is normally open.
The four deluge trip valves are located west of the filters on the outside east wall of the Fuel Handling Builcing.
Manual isolation valves for each of these deluge valves are located immediately below the deluge valves. There are two valves dcwnstream of the deluge valves for filters #1 and #2.
These were installed to get the unit operational orier to completing tne fire service hookup and are normally open. When investigating a high filter bed temperature alarn the important points to remember are:
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1.
The units are arranged, from north to south as Unit #3, 4, 2, l.
2.
Regardless c/ the numbe.r system, the deluge valves are arranged at the valve station so that they correspond to the position of their respective filter housing from north to south.
3.
To initiate water flow, the fire brigade must open the manual valve below the deluge valve then trip the deluge valve at the Break Glass Station (manual pull box on the deluge valve).
He should hear water flow and see water come from the drain piping at the valve station. The Control Room should also report a fire pump start.
NOTE:
There,is M automatic deluge valve actuation - This requires manuai action.
4.
When investigating a high temperature alarm, be alert for smoke, heat, odor and the local indications on each filter housing:
0 a.
yellow pre-alarm light set 0 220 F.
b.
red alarm light set 9 325 F c.
white alarm light indicatinc snsor failure.
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Temperature gauge indication on each unit 150 to 400 F range.
A high temperature alarm is good indication of a pgtential fire since the out of service heaters are limjted to 90 F, a resetting thermal cutout limits temperature to 135 F, and a manually reset g
thermostat cuts out the heaters completely at 185 F.
All of these setpoints are below the alarm setpoints for high bed temperatures.
Therefore, when investigating a high temperature, the heaters should be secured as soon as the high temperature is verified. The heaters of the affected unit may be secured by pushing the stop button and opening the knife switch on the panel at the filter. Also de-energize the space heater on the affected unit by opening the breaker on the appropriate 120V distribution Dv l (MP2-38 or MP2-48) located in the Switchgear Enclosure).
After the heaters are secured in the event of fire, initiate delu spray as previously discussed, for a 5 minute period.
Flow is secured by shutting the manual valve below the deluge salve.
It is reccmmended that a brigade member stand by the deluge station while other personnel monitor temceratures of the filter units in the event fire occurs on the other filters.
It may also be advisable to monitor the local panel on the turbine floor.
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The po..antial for a rel;ase of radh ctive material is the most significant result of a fire in these units.
No significant fire exposure to other plant systems exist.
Consideration should be given to securing and isolating the vantilation sys'. ems that are tied into rM s system.
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rh.~~em..e o Table 1 HOSE STATICNS 1.
Control Building Mechanical Equip =ent Rocm, Elevation 351'-6"> C47-CA (South wall) ; Locate hose station 12 feet from inside of wall.
(Tag nu=bers:
Isolation gate valve - FS-V-654, Hose angle valve - FS-V-655, Monitor switch - FS-KS-6700) 2.
Control Scilding Mechanical Equipment Rocm, Elevation 3 51'-6";. Between C49-C50 & CD, (North wall) ; Lccate hose station 10 feet frcm Panel 709AG (edge of panel)
(Tag n"-kers:
Isolation gate valve - FS-V-656, Hose angle valva - FS-V-L 17, Monitor switch - FS-KS-6701) 3.
Cc r. trol Building Battery & OC Switchgear Recm, Elevation 280'-6", C-49-CA (South wall).
(Tag numbers:
Isolation gate valve - FS-V-656, Hose angle valve - FS-V-657, Moniter switch - FS-KS-6701) 4.
Control Stilding 3attery 1 CC Switchgear Rec =. Elevation 280'-6", C48-CD (North wall).
(Tag numbers :
Isolation gate valve - FS-V-660, Hose angle valve - FS-V-661, monitor switch - FS-KS-6703) 5.
Auri'i= y Building, Elevation 328'-0", 3etween AJ-AL, A62; Locate hose station nent to 40 3:C fire extinguisher (wall, directly north of Unit Substation 2-45).
(Tag numbers:
Isolation gate valve - FS-V-662, Hose angle valve -
FS-V-663, =onitor switch - FS-KS-6704) 6.
Auxiliary Building, Elevation 305'-0"; Between AE-AG, A60 (East wall) ; Lccate hose statica seven feet from end of wall cf Unit Substation acem 2-21E.
(Tag numbers:
Isolation gate valve - FS-V-664, hose angle valve -
FS-V-665, monitor switch - FS-KS-6705) 7.
Auxiliary Building, Elevation 305'-0";,Between A60-A61, at (North wall); Locata hose station 15 feet from end of eas: wall., (Tag numbers:
Isclation gate valve - FS-V-666, hose angle wall - FS-V-667, monitor switch - FS-KS-670G) 8.
Auxiliary Stilding, Elevation 280'-6"; Between AE-AG &
A62-A63; Lccata hose station between doors to recms con-taining WOL-K-2A aad WDL-K-23.
Do not locace hcce station on block wall.
(Tag numbers:
Isolatica gate valve -
FS-V-663, hcse angle valve - FS-V-669, monitor switch -
FS-KS-6707) 357040 m _
Table 1-(Continued)
HOSE STATIONS V/
i 9.
Control Building Area (West side), Elevation 282'-6",
t CAa-CS7; Locate hose station on west side of column.
(Tag nu=bers:
Isolation gate valve - FS-V-670, ho.
1 angle valve - FS-V-671, monitor switch - FS-KS-6708, 10.
Diesel Generator Building (West) ; Between DD and DE, D70, 10 feet south of edge of double door.
(Tag numbers:
Isolation gate valve - FF-V-672, hose angle valve -
FS-V-673, monitor switch - FS-KS-6709) 11.
Diesel Generator Building (East); Between DD and DE, D69, 10 feet south of edge of double door.
(Tag numbers:
Isolation gate valve - FS-V-674, hose angle valve -
FS-V-675, =cnitor switch - FS-KS-6710) 12 River. Water Pu=p Hose; Locate hose station si:: feet south of double doors of Switchgear Roo= 2-3E.
(T 2g nu=bers :
Isolatic:. gate valve - FS-V-676, hose angle valve -
F$-V-677, monitor switch - FS-KS-6711) 13.
River Water Pu=p Ecuse; Locate station near emergency exit fira door, locate station 5 feet west of edge of door.
(Tcg n-'ers:
Isolation gate valve - FS-V-673, hose angle valve - FS-V-679, =onitor switch - FS-KS-6712)
' 14..
Con r '- "" 4' ding, Ele'vation 305'-0". Cable Roo= C46-47 &
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CA; Locate hose station four feet west of edge of door.
(Tag nu=hers:
Isolation gate valve - FS-V-680, hose angle valve - FS-V-631, monitor switch - FS-KS-6713) m o
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