ML19261F130
| ML19261F130 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/20/1978 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| GQL-1250, NUDOCS 7910240791 | |
| Download: ML19261F130 (16) | |
Text
.
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e RE9FFRGE TO NRC REQUEST OF 06/20./70.
FORWARDING ADDL INFO CONCERNINO i'_'? JECT FA.'*LITV"5 FIRE PROTECTICN FROOF AM.
i LANT NAME: THREE MILE ISLAND - UNIT 1 REVIEWER INITIt
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POST OFFICE BOX 542 READING. PENNSYLVANI A 19603 TELEPHONE 215 - 929-3601 July 20, 1978 GQL 1250 Director of Nuclear Reactor Regulations Attn:
R. 'd.
Reid, Chief Cperating eacters Branch No. k U. S. Nuclear Regulatory Cc==ission
'4as hingten, D. C. 20555
Dear Sir:
Three Mile Island Nuclear Station Unit 1 (S!I-1)
Operating License No. DPR-50 Docket No. 50-289 Fire Protection - Additional Information In response to your letter of June 23, 1978, attached are ten (10) copies of the requested information.
Sincerely,
/ J. G. Herbein
/
/ Vice President-Generation i
/
JGH:RJS:ejg Attachment c,_ c.);.1 -
1485 285 g'gIDc I D v g0
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""4REE MILE ISLTTD UNIT 30.1 FIRE PROTECTION PROGRAM FEVIE'.i RECUEST FOR ADDITFNAL INi'ORMATION 1.
In your letter or J:ne 12, 1978, your respons: to Question 8 identifies areas where fire detectors and/or suppressior systems will be installed, but does not explicitly address the question as asked. Assuming the fire detection and/or suppression systems are installed as proposed in your response, vill there then remain any 9.reas which contain safety related equipment and/or cables in open cable trays that are not pro-vided with either fire detection or autcmatic fire suppression.
If there are such areas, identify them and justify the lack of fire detec-tion means or automatic fire suppression.
Response
The following areas are not provided with either fire detection er automatic fire suppression.
a.
?uel Handline Building (Elev. 280') - A study in accordance with the response to Staff Position P9 vill be performed on marinite barriers, and proposed modifications, if any, vill be submitted July 15, 1979 (Elev. 305', 329', 331') - Limited amount of ecm'.ustibles (32,200 stu/
ft#) and spatial separation between cable trays.
(Zone between Fuel Fool (east vall) and Centrol Building Elev. 322' to 380') - Fire hoses will be added to this area per Fire Hazards Analysis Report ec=mitment. Loss of safety related ca.bler in this scne vill not ecmpromise safe shutdown.
b.
Auxiliary Building (Elev. 271') - Limited amount of combustibles (2,700 3tu/ft ) and spatial separation between redundant equipment and cable trays.
(Elev. 281') - Rated fire vall between MJ-P1A and MU-P13.
MU-F13 and MU-F1C are separated by a concrete vall. Limited a= cunt of combustibles.
(Elev. 281' - Valve gallery) - Limited amcunt of ccabustibles (3,600 3tu/
ft2) and spatial separation betweer redundant trays.
S (Remainder of Elev. 281') - Linited ccabustibles (20,500 3tu/ft~) and spatial separation between redundant cable trays.
(Note: Penetration area is protected with detectors and sprays. )
( Elev. 305' Demineraliser and Motcr Centrol Centers, Decay Heat Removal 1485 286
. and Nuc; ear Service Closed Cocling Pgp area) - Limited amount of ccabustibles (22,000 and 9,000 stu/ft ) and spatial separation between redundant equipment and cable trays.
9 c.
Intermediate Building
( Elev. 322') - Limited amcunt of combustibles and spatial separation.
Shin Steen safety relief valves are spring loaded and vill not be af-fected by fire.
2.
Supplement your response to Question 17 (Met-Ed letter of June 12, 1978) as follows:
a.
Indicate whether the "ecmbination fire-stat and smoke detector" units are UL or FM approved for the indicated application, and briefly des-cribe their principle of operation, sensitivity and speed of response.
b.
Indicate whether the operators for the fire dampers which are actuated by detection of high temperature, smcke, cc=bustible vapor, etc., are UL cr FM approved for the indicated application and briefly describe their principle of operation and speed of response.
c.
Describe hcv the ionizatien detectors are "self =cnitoring against circuit faults" and indic te whether the fault is alarmed in the Control Roem.
Restonse:
a.
The smoke detector units are Pyr-A-Lars Model CDA-1 and are listed by Underwriters ' Laboratories, Inc.
The fire-stat units are Jchnsen T-Th02 Electric High Limit Thermostat and are not UL or FM approved.
Both units are being used in the application they were designed fer.
Attached are copies of the catalcg specification sheets for the above units.
b.
The caly fire dampers presently installed at TMI-1 in safety related areas are in the air intake tunnel. These dampers are of the trap decr type activated by an Electric Thermal Link (E*L).
The CL's are UL listed and are actuated by an early warning Pyr-A-Lara release model SDH-8.
The dampers are gravity operated upon actuatien.
Refer to the response to Questien 8.h (p29/Q28).
c.
3 Supplement the respcnse to Questien 30 (Met-Ed letter of June 12, 1978) by providing the specific information requested regarding the type and quantity of transient ccmbustibles likely to be found in each fire tene.
In addition, discuss the effects of transpcrting transient ccabustibles, especially combustible liquids, through other senes which vere not analyzed for their presence. Provide the bases for your conclusiens regarding the effects v2 transport of transient ccabuctibles and proposed corrective measures, if any.
I485 287
Respense:
A review of the fire zones vill be performed to determine the effects of transporting transient ec=bustibles through zones which were not analyzed for their presence. The results of this review and proposed corrective measures, if any, vill be submitted by October 31, 1978.
4.
Supplement the response to Question 51 (Met-Ed letter of June 12, 1978) to identify any areas where loss of function was not assumed for cables contained in metallic conduit or metallic interlock ar=or when the enclosure was exposed to a postulated fire.
P_ ovide justification for any exceptions.
Fespcnse:
Loss of function was assumed for cables centained within retallic conauit or provided with metallic interlock armer where these enclosures were ex-posed to a postulated fire.
5 Supplement the response to Question 29 (Met-Ed letter of June 12, 1978) as follevs:
a.
Indicate the source of power for activation of the carben dioxide extinguishing system in the relay recm.
b.
Indicate whether discharge of the autc=atic carbon dicxide and Halon systems is annunciated in the Control Rocm.
Response
a.
The source of power for activation of the carbon dioxide extinguishing system in the relay rces is the 1A ES motor centrol center.
b.
Actuation of the autcmatic carben dioxide and Halcn systems is annunciated in the Control Rocm.
The CO annunciates on Fanel Right Front (FRF), and the Halen annunciktes en the overhead an-nunciator panel.
6.
Supplement the response to Question 2 (Met-Ed letter of June 12, 1973) to verify that in the event of a failure which vculd disable both a fixed water suppression system and the backup =anual hose station, a second hace station capable of serving all of the affected area vould remain Operable. If the present design of the fire water suppression system does not provide this capability (within NFPA requirements), indicate your conmitment to provide this capability.
Resconse:
Investigations subsequent to cur July 11, 1978 telecon, revealed that there are no fire hose stations, independent of the fixed water suppres-sien system and b2ckup manual hose station within 100 feet cf the safety related equipment in the Auxiliary Building (Elev. 305').
1435 288
h_
Therefore, a review of the fire system for the Auxiliary Building vill be performed to determine the modificaticns necessary to previde a backup water system to areas where both the fixed water system and the backup manual hose station could be disabled in the event of a failure.
Results of this review, proposed modifications, and the schedule for installation vill be submitted by Cetober 31, 1978.
7 Describe the analysis that.as performed for the Turbine Building to support the ccnclusions given in Section h.8.3 of the TMI-l Fire Hazards Analysis Report.
Response
A f'.re loading analysis is being performed to determine the Turbine Building fire loading in further support of the conclusions given in Section h.8.3 of the TMI-l Fire Hazards Analysis Report. Results of the analysis vill be submitted by August 15, 1978.
8.
Indicate your cc=mitment to conform to the ic11cving Staff Positions regarding Fire Protection at TMI-1:
a.
(P5a) Fire door release mechanisms should be fast-acting to prevent adjoining areas (particularly stair wells) frcs filling with s cke.
A fusible link based mechanism is not acceptable for this application.
b.
(P13) All unlabelled fire doors and frames should be replaced by fire door assemblies having an appropriate rating or the adequacy of the fire resistance of the door assenblies should be established through tests, or other acceptable means.
c.
(P1k)
(1) An alternate shutdown capability independent of the cables and equipment in the relay roc = should be provided, and (2) A manually operated fixed water suppressicn system should be provided in the relay reca as a backup to the automatic CO system.
2 d.
(plt) A sucke seal should be provided to seal each of the electrical bus ducts penetrating the barriers enclosing the switchgear rects.
e.
(P21) a.
Training classes should be scheduled at least quarterly and crganized such that the fire brigade training program is repeated within each two year period, and b.
A detailed review of the fire fighting procedures, pre-fire strategies, procedure changes, and plant =cdificatiens relating to manual fire fighting should be included in the fire brigade training program.
f.
(P27/Rh) Met-Ed should provide by December 31, 19T8, an analysis of the effect of water sprays tc determine whether bcth divisions of safety related equipment could be incapacitated by rupture or inadvercent operation cf fire water systems, or the ap-1485 289
. plication of fire hoses in each fire area.
If the analysis indicates that both divisiens could be disabled, Met-Ed should commit to provide corrective =cdif.ications, and des-cribe the modificatien that vill be provided.
g.
(P28/Q25) Met-Ed shculd provide by December 31, 1978, an analysis to determine whether a single fire at any location could cause loss of both local control and centrol frcm the Control Recm of any systems needed for safe shutdown.
If the analysis indicates such loss could occur, Met-Ed shculd cc=mit to provide corrective modifications and describe the modifications that vill be provided.
h.
(P29/Q28) Signal initiating and alarm circuits for all fire detection and suppression systems should be supervised to detect and annunciate in the Centrol Room, circuit and ground faults and pcVer supply failure.
i.
(P3?/Qhl) An effective fire barrier should be installed between a non-safety related cable tray located below the redunda: t ec==unication cable penetrations inside containment to protect these penetrations frcm a possible fire in the tray.
Response
a.
The only enclosed stair vell is in the Centrol Building. The fire docrs between the Turbine Building and Centrol Building consist of two fire doors in series separated by about 10 feet through an off-set corridor. Althcugh these doors are not locked, they are kept closed when not in use. All other fire doors in this stair well are locked except for the entrance to the Control Room (Elev. 355') and the entrance to the Health Physics centrol point (Elev. 305').
Both of these decrs vill be electrically locked at all times and access vill be controlled as part of the Physical Security Program, with installation scheduled to be completed by January 1,1979 b.
All unlabelled fire docrs and frames vill be replaced by fire door assemblies having an appropriate rating, or the adequacy of the fire resistance of the decr assemblies will be established thrcugh tests, or other acceptable means.
c.
(1) An alternate shutdown capability independent of the cables and equipment in the relay roc = vill be provided. The design vill be submitted to :iRC for review and approval when ecmpleted. It is anticipated that installation vill be ccepleted by the end of the 1980 refueling outage.
(2)
The following fire protection is provided for the relay rocm:
Early varning (ionicatien) detection which alarms in the a.
centrol roca.
1485 290
e 4
b.
Aute=atic low pressure CO, system actuated by heat detectors (lkO F) and designed for " double-shot" protection in accor-O dance with BTFpA-12. The system acceptance test verified that a 50% concentration held for 18 minutes and a 40% for 23 minutes.
Therefore, with a " double-shot", a 50% concentration should hold for at least 36 minutes and a h05 for h6 minutes.
c.
Portable fire extinguiahers i==ediately available in the vicinity of the relay roc = as shcvn on Dvg. No. E-023-016.
In addition, a fire hose station vill be provided outside each access door to the relay roc =.
Therefore, with all of the above, adequate protection is provided for the relay roc =, and a manually operated fixed water system is not necessary.
d.
Further investigation of the SK7 CALVERT Bus Duct, revealed that there are vapor seals installed in the bus duct at all fire valls where the bus duct penetrates safety related areas. These installed vapor seals satisfy the requirement for providing smoke seals. Attached are the manufacturer's drawings for your review.
e.
a.
Training classes will be scheduled at least quarterly and organized such that the fire brigade training program is repeated within each two year period.
b.
A detailed review of the fire fighting procedures, procedure changes, and plant =cdifications relating to manual fire fighting vill be included in the fire brigade training program.
The pre-fire strategies vill be developed and implemented by July 1,1979 at which time they will be included in the fire brigade training program.
f.
An analysis of the effect of water sprays as described vill be provided by Dece 'er 31, 1978. If the analysis indicates that both disablet, corrective =cdifications vill be pro-divis'ons coul vided C appro,d I,e.
g.
An analysis to determine whether a single fire at any location could cause less of both local control and control frc= the Centrol Roc =
of any systems needed for safe shutdcvn vill be provided by December 31, 1978.
If the analysis indicates such loss could occur, corrective modifications vill be provided as appropriate.
h.
A study will be performed to determine if the signal initiating and alann circuits for all fire detection and suppression systens are supervised to detect circuit and ground faults and pcVer supply failure and annunciate in the Centrol Room. The results of this study and propcsed modifications, if any, vill be submitted by December 31, 1973.
1485 291
_7_
- i. A fire barrier vill be installed in each cable tray (s) belev the redundant communication cable penetrations inside co tainment (Penetrations #313 and #205) to protect these penetrations frce a possible fire in the tray (s). The redundant ec==unications cir-cuits are run in conduits throughout containment. Refer to the response to NRC Staff Position P9 1485 292
APPARATUS T-N M auutun StPI JOHNSON 00F' TROL DE ao""So" 5"="
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,of trouble operated relay contacts. One set of alarm contacts is normally open and the second set is of the single pole double The Pyr-A-Larm Afodel CDA-! is a comrictely self-centained throw type. The set of trouole operated contacts is of the air Juct detector unit designed for installation directly to the single pole double throw ty pe. All contacts are non powered d cts associated with air conditioning, heating and ventdating and rated at 5 amreres.120 volts. 60 cyc!es,
- s. stems. The unit orfers the following unique features:
The detector unit has visual indicators for power and e THE IONIZATION PRINCIPLE OF OPERATION-alarm. Further. there are terminals for the connection of a The Slodel CDA-1 uses a Pyr-A-I. arm lonization Dctccror as Pyr-A-Larm remote alarm lamp. Nfodel RAL 1 or RAL-2.
the ccmbusuon sen6ng c!cment. The Jetector responds directly which may be located at a remote pomt from the detector to comoustion products without requiring the prc<cnce of heat, unit. Additional mdicators of alarm and trouble may be con-flame or visib!e smoke. The sensiovity of the detector is ad-trolled from the relay contacts in the unit. The unit can also lustable over a wide range and can be checked with the be connected to most coded and non-coded systems.
Pyr-A Larm Stodel SCU-6 Sensitivity Checker under actual e ECONO 31ICAL INSTALLATION-Air handling fans may s
dynarnid air flow conditions.
be controlfed directly from the unit, thus eliminating the e S ELF-CONTAIN ED OP ER ATION-The unit contains running of wiring to and from remote control units. All that its own power supply, supervision and control circuitry. All
'S D'.cessary for instalianon n the cutting of a hole (template that is required is a standard 120 volt. 60 c)cle. AC power pr vided) and the drilling of four mountmg hoacs :n the duct.
input. The umt consumes less than I watt of power in standby The unit is then mounted in place and connechons made to operaticn and fess than 6 watts in alarm.
terminals provided.
- EFFICIENT OPER ATION-The detector unit employs a
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section::1 sample of the air moving throuch the duct is taken.
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combustion prnducts (especially in large ducts) from reaching f
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a spot. type detector. In adJitien, the unicue design of the
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II!GIIEST !lOsstar.E REI.! Ant!.ITY,4ll ccmponen:s are the f.tte=t m hien *eh a rt h t y.
<nch as ;:.ns-sealed reed 1
t appg Wg p]g-p, y
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re<istant Just cave t 7 5e Ntodel CDA-i is rated for conuncous
.i relays and control e!.ns totally e9c!cced mth 5 eat and shed v
M. @.
m=d=Q. m m
f-Wip.-g%p@.*;
e dt*ty and is dc< ired 'c Orcrate ove a tempernre e::cee of g
4 C
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r' -
rr
-20*F to -IWF. De comperents are mcunted an 1 neavy b
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B~n#GCM duty. eroty cn.ss. pro ted c:r mt coarJ. The power and shrm l esE M-'Md.bf$-DdkhMR'y_q indicators ire !cnc-iiic neen lam ps with no ilamems to Surn ott.
' *=??Q PvROTRONICS, INC. 1 A85 29% f jaansiese_n g
-,m E
- f. fcot o l? O P EI'.t TIO N-A ret m + \\!odel RS l.
- 5. Proude on-.e t # Cn e!: role dniiN: throw trouble-
- i. 3 a.
- cr me with ths CDAl' e
ch enaHes the ore ated
- cor
. '5 A.
I:0V., AC).
un ta Fc Sc: ' rom i remote icca:1-w
.I has orcrated.
The unit shal:, crate om a two wire 120 vcit. 60 cyde Tic ece: s.
ch is key cremrej and of th: momenta ry S r0 rower source.ind <h.iii he orcrible over a ran;e of 102132 m :h: ro u-k always arrhed ta the timt. esecrt when the voits. The trouNe circuit sha.1 ac:ivate if the umt becames s v t.n s.;re tc). The Wde! CD b1 can also be reset by a innreratne due to Iow input seita;e. T c standby power con-key arcr:ael switem located on the aucmbly.
sumption, excluding any external deuces, shall r:ot etcced f.%
. S.Uli't.ING T!*!!ES-To in<ure accurate sampling of the I Si *
!{
mr.n :he.. r conj."oning sprem. pairs of sampiing tubes in The unit shall inc!ude power and alarm indicator !ights. It -
'our orn :nie nt lengths are avalaole from Py rot torucs. In shall have a key operated momentary switch for resett:rg Nct n; me Urrerrute !cn;:5 of tube $rst the w.dth of the the umt. A remete reset switch assemcly shall he availacle as y:.
is J. crnurel. then the san.run; tore nearest to, but an optional accessery. !! shail be pass.cle to check the de-greater th,'n :ne Jrc widt5. is se:ected The :uoing then is tector's sensitivity under actual air How conditions, using tr.mmed at :he job site to the exact width of the duct.
Pyr A-Larm Sensitivity Checker.
S.01PLING TUEE SELECTION CHART The unit shall be mounted directly to the outside of duct Duer Width Samplinst Tube Size by means of four belts (surplied). A template sha:1 be provided for making necessary cut outs and holes. Complete mstruc-9 inches to 1% ft.
2 ft.
tions shall be provided with unit.
[I,
- j,
I can n f detec: ors within ventdation systems ( e. g.
Sew t.
f NOTE TO ARCHITECT:.When puilding codes regulate,the a) fr. to 10 't*
10 ft*
York City Building Code). refer to the appropriate building code to be sure that the nu nber and location of detectors is AnCHIiECT.S SPECIFICATIONS in accoreance with code reguistions.
i he att duct f:re detector umt shal1 be a Pyr-A-Larm Model Co.ui : snaa ee asted by Unecronters-Labermones. inc.
ORDERING INFORMATION The Umt shall te designed fur detection af comoustion pes. ire..r d smoke in mr condit cning and atilauon system wuo <n comriiance with the Nat:onal Fire rrotection Associa.
Shiccing en. Necammended Pracmes pampnier No. 90A. It shall con-Model Weig9t v of a Pyr-A.Larni :omzar.on-tyre-detector with self-contained No.
Cescription (Ibs.)
cent ci amt The asemoly shall consist of a casting to ac-1;iine tubes w5:ch estend across the duct of CDA.I Air Cuct Cetector Unit O.ncludes cornmoda te s
the sentiistaen s>ste'm. Whi!e the fans arc operating, a con.
detecict, less sam; ling tubes.)
6V2 nnuaus erm utienal saminng of air from the duct will dew ernu;h the tentation detector, af:ct which the sampled ASI*2 2 fcCt Air Duct Sameling Tubes (pr.)
1 nr paii be returned to the duct.
AST-3 3V2 feet Air Cuct Sarn:: ling Tutes (pr.) 2 The enit <nal1 prcvide the foltowin2 functions:
I f urneh necesvrv DC power for operation of the detector.
A ST-o, tW.2 feet Air Cuct Samcling Tubes (pr.)
- ,,2
- 3. Sorerme the detector ciret:it and all re:ry coils.
AST 10 10 feet Air Cuct samcling Tubes (pr.) 5
. nuce rower to the neon alarm indicators.
4.
P uude one *et of normally open and one set of single RS 1 Reset Switch Assembly I
role 4fouble throw alarm operated relay cont:: cts (SA.,
l'0V.. AC ).
Note: samphng tut:es are orcered and Shipped in pairs.
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