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| issue date = 04/04/1986
| issue date = 04/04/1986
| title = Forwards Requested Addl Info Re Fire Protection.Smoke & Heat Purge for Each Fire Zone Specified in Prefire Plans. Portable Exhaust Fans Not Used for Purging W/Exception of Areas Not Having Permanently Installed HVAC
| title = Forwards Requested Addl Info Re Fire Protection.Smoke & Heat Purge for Each Fire Zone Specified in Prefire Plans. Portable Exhaust Fans Not Used for Purging W/Exception of Areas Not Having Permanently Installed HVAC
| author name = CUTTER A B
| author name = Cutter A
| author affiliation = CAROLINA POWER & LIGHT CO.
| author affiliation = CAROLINA POWER & LIGHT CO.
| addressee name = DENTON H R
| addressee name = Denton H
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000400
| docket = 05000400
Line 16: Line 16:


=Text=
=Text=
{{#Wiki_filter:ACCESSION NBR: FAC IL'0-400 AUTH.NAME CUTTERi A.B, REC IP.NAME DENTON>H.R.'REGULATORY FORMATION DISTRIBUTION S M (RIDS)8b04080274 DOC.DATE: 8b/04/04 NOTARIZED:
{{#Wiki_filter:'REGULATORY   FORMATION DISTRIBUTION S             M (RIDS)
NO DOCKET 0 Shearon Harris Nuclear Power Planti Unit ii Carolina 05000400 AUTHOR AFFILIATION Carolina Power h Light Co.RECIPIENT AFFILIATION Office of Nuclear Reactor Regulationi Director<post 851125  
ACCESSION NBR: 8b04080274       DOC. DATE:   8b/04/04   NOTARIZED: NO           DOCKET 0 FAC IL'0-400    Shearon Harris Nuclear Power Planti Unit         ii Carolina   05000400 AUTH. NAME            AUTHOR AFFILIATION CUTTERi A. B,        Carolina Power h Light   Co.
REC IP. NAME          RECIPIENT AFFILIATION DENTON> H. R.        Office of Nuclear Reactor Regulationi Director <post         851125


==SUBJECT:==
==SUBJECT:==
Forwards requested addi info re fire protection.
Forwards requested addi info re fire protection. Smoke 5 heat purge for each fire zone specified in pre-fire plans.
Smoke 5 heat purge for each fire zone specified in pre-fire plans.Portable exhaust fans not used for purging w/exception of areas not having permanently installed HVAC.DISTRIBUTION CODE: AOObD COPIES RECEIVED: LTR ENCL SIZE: TITLE: OR Submittal:
Portable exhaust fans not used for purging w/exception of areas not having permanently installed HVAC.
Fire Protection NOTES: Application for permit renewal filed.05000400 RECIPIENT ID CODE/NAME PWR-A PD2 PD 01 INTERNAL: ADM/LFMB IE WHITNEY'NRR PWR-A DIR NRR STANGa J 07 NRR/DHFT DIR RGN2 COPIES LTTR ENCL 3 3 1'1 1 1 1 2 2 1 1 1 1 RECIPIENT ID CODE/NAME BUCKLEY'S B KLD/HDS1 NRR BWR DIR NRR P WR-B D IR E ILi JOb REQ ILE 04 COPIES LTTR ENCL 1 1 1 0 1 1 1 1 0 1 1 EXTERNAL: 24X NRC PDR 02 1 1 1 1 LPDR NSIC 03 05 1 1 1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 20 ENCL 17 G(i:G3'XAATP~
DISTRIBUTION CODE: AOObD       COPIES RECEIVED: LTR         ENCL       SIZE:
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TITLE:   OR Submittal: Fire Protection NOTES: Application for permit renewal filed.                                     05000400 RECIPIENT         COPIES            RECIPIENT            COPIES ID CODE/NAME      LTTR ENCL        ID CODE/NAME           LTTR ENCL PWR-A PD2 PD 01        3      3      BUCKLEY'S B              1    1 INTERNAL: ADM/LFMB                 1 KLD/HDS1                  1    0 IE WHITNEY'           1      1      NRR BWR DIR              1    1 NRR PWR-A DIR         1     1     NRR P WR-B D IR           1 NRR STANGa  J  07    2      2            E     ILi JOb       1    0 NRR/DHFT DIR          1      1      REQ   ILE       04       1     1 RGN2                  1     1 EXTERNAL: 24X                      1     1     LPDR            03      1     1 NRC PDR         02     1     1     NSIC             05       1 TOTAL NUMBER OF COPIES REQUIRED:       LTTR   20   ENCL     17
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SNK Carolina Power&LIght Company APR 4 1986 SERIAL: NLS-86-101 Mr.Harold g.Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO.1-DOCKET NO.50-000 FIRE PROTECTION
-ADDITIONAL INFORMATION


==Dear Mr.Denton:==
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Carolina Power R Light Company (CPRL)has been requested to provide additional information concerning the following fire protection issues: 1)Method of post-fire smoke and heat purge.2)Conformance with the guidance of Branch Technical Position 9.5-1, Section C.7.b, Control Room Complex.Attachment 1 pro'vides the information requested.
                                                                                                                                          'i(
Should you have any questions concerning this letter, contact Mr.Patrick P.Carier at (919)836-8165.ABC/PPC/rtj (3596PPC)Attachment A.B.Cutter-Vice President Nuclear Engineering R Licensing Cct Mr.B.C.Buckley (NRC)Mr.G.F.Maxwell (NRC-SHNPP)
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Dr.3.Nelson Grace (NRC-RII)Mr.Travis Payne (KUDZU)Mr.Daniel F.Read (CHANGE/ELP)
t<.T~".,~,>> ~: ~eA SO>irVV~
Wake County'Public Library Mr.Wells Eddleman Mr.3ohn D.Runkle Dr.Richard D.Wilson Mr.G.O.Bright (ASLB)Dr.3.H.Carpenter (ASLB)Mr.3.L.Kelley (ASLB)Mr.H.A.Cole 8~OOOSon4 S6040~PDR ADOCK 05000000 F PDR'11 Fayettevilte Street~P.O.Box 1551~Raleigh.N.C.27602 ATTACHMENT 1 Question: How will Shearon Harris Nuclear Power Plant (SHNPP)ventilate post-fire heat and smoke from a fire area where the adjacent fire area contains redundant equipment?
Pt  'v~>>>(O>1    t~(>X  I4      T    ~  ~
The concern is that the purging process would break the fire ban ier and could possibly cause smoke and heat damage to redundant equipment.
j Vt, K 1    l A J l'"13+        1 &i."", J 3
~Res onse: Smoke and heat purge for each fire zone is specified in the pre-fire plans.SHNPP does not use portable exhaust fans for purging with the exception of areas not having permanently installed HVAC.Areas not having permanent HVAC are: 1)the Intake Screening Structure (this area is remote to the power block and does not present an exposure hazard to redundant equipment) and 2)areas adjacent to the former Unit 2 containment and fuel handling building.For these areas, smoke and heat will be exhausted directly to the atmosphere.
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For the majority of the remaining areas, smoke and heat will be purged using the normal ventilation system.Some areas (e.g.cable spreading room, control room)have a dedicated purge system, which will be used to ventilate these areas.In both cases, no fire barriers will be breached so smoke and heat damage to redundant equipment will not occur.Should the fire cause the fire dampers to automatically close, these dampers will then be locally re-opened after the fire is extinguished to establish flow.Should the effects of a fire be severe enough to isolate every branch of the HVAC system for an area, the damaged sections could be repaired or removed to establish an adequate flow path.Access paths to each area are specified in the pre-fire plan.Access paths which could result in an exposure of redundant equipment in the adjacent room will be so noted in the plan so that an alternate path will be used.Question: BTP 9.5-1, Section C.7.b states: "Peripheral rooms in the control room complex should have automatic suppression and should be separated from the control room by noncombustible construction with a fire resistance rating of one hour." How does the SHNPP meet this guidance?~Res onse: SHNPP control room fire area as shown in FSAR Figure 9.5A-10 is not provided with an automatic suppression system.This was found acceptable by the NRC in SER Supplement No.2 dated 3une 1985.As shown in FSAR Figure 9.5A-10, the wall between the Main Control Board (MCB)area and the Main Terminal Cabinet/living quarters (MTC)area is not shown as a rated barrier.In our comparison to BTP 9.5-1 (NUREG-0800), Section C.7.b, dated October 10, 1983, CPRL addressed this area.The MTC area is an extension of the MCB area.It is an integral part of the main control room habitability envelope.This MTC area (like the control room)contains redundant safe shutdown equipment, therefore, a fire in this area would require the plant to proceed to alternate shutdown per BTP 9.5-1 Section C.5.c.It is noteworthy to realize that the MTC area is separated from the MCB area by 0-feet thick concrete walls.Additionally, the HVAC is (3596PPC/ccc
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heavy gauge seismic Category l duct work.The HVAC return from the MTC area passes through the MCB area but has no openings in the MCB area.The other areas (i.e., office, kitchen area), when in use, will be occupied by personnel trained and knowledgeable in fire protection.
                                      ~ 3>'H        b  't,t., 1 >. t tt't  >>,    tXt'T Q i> mftt t'9 (i Pft g r'>i t,                t,  ', >>  '~6o >tt J>.>rtR              N      j:(>:.<(r.-. -."di>l ('3 1'TQ~t              GBQGA; 8('"J') ViP z                      >
The control room cotnplex is continuously manned with licensed operators that are knowledgeable in emergency response, plant systems and safe shutdown procedures.
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The walls that bound the office/kitchen from the MTC area are seismic block walls that provide equivalent one-hour protection.(Penetrations, doors, etc., are not fire rated construction.)
 
An automatic, single sprinkler head will be provided in the office/kitchen area to provide additional protection.
SNK Carolina Power & LIght Company SERIAL: NLS-86-101 APR      4  1986 Mr. Harold g. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 - DOCKET NO. 50-000 FIRE PROTECTION - ADDITIONALINFORMATION
The following will be incorporated in the design of this sprinkler:
 
I)The source of water will be'potable water.2)One-inch copper tubing will be used.3)Non-seismic rod and clevis will be used to support the copper piping.0)A manual isolation globe valve and two check valves will be used.5)A flow alarm will be provided.In summary, CPRL provides adequate protection for the MTC and the office/kitchen areas of the main control room complex for the following reasons: l)Alternate shutdown is provided for a disabling fire in the MTC area (regardless of the genesis of the fire).2)The control room complex is continuously manned by licensed operators knowledgeable in fire protection and safe shutdown procedures.
==Dear Mr. Denton:==
3)A single, automatic sprinkler head will be provided in the office/kitchen area.0)A hose station is located in the MTC area.5)The wall between the MTC and office/kitchen is a seismic block wall which will aid in containing a fire.6)HVAC return duct from the MTC area is heavy gauge seismic Category l duct work.The above stated fire protection features, training and design provide defense in-depth to ensure that the safety of the plant is maintained for any potential fire in the MTC room.(3596PPC/ccc)}}
 
Carolina Power R Light Company (CPRL) has been requested to provide additional information concerning the following fire protection issues:
: 1)     Method of post-fire smoke and heat purge.
: 2)     Conformance with the guidance of Branch Technical Position 9.5-1, Section C.7.b, Control Room Complex. pro'vides the information requested. Should you have any questions concerning this letter, contact Mr. Patrick P. Carier at (919) 836-8165.
A. B. Cutter - Vice President Nuclear Engineering R Licensing ABC/PPC/rtj (3596PPC)
Attachment Cct    Mr. B. C. Buckley (NRC)                                  Mr. Wells Eddleman Mr. G. F. Maxwell (NRC-SHNPP)                            Mr. 3ohn D. Runkle Dr. 3. Nelson Grace (NRC-RII)                            Dr. Richard D. Wilson Mr. Travis Payne (KUDZU)                                Mr. G. O. Bright (ASLB)
Mr. Daniel F. Read (CHANGE/ELP)                          Dr. 3. H. Carpenter (ASLB)
Wake County'Public Library                              Mr. 3. L. Kelley (ASLB)
Mr. H. A. Cole 8~OOOSon4 S6040~
PDR    ADOCK 05000000 F                    PDR
                            '11 Fayettevilte Street ~ P. O. Box 1551 ~ Raleigh. N. C. 27602
 
ATTACHMENT 1 Question:
How will Shearon Harris Nuclear Power Plant (SHNPP) ventilate post-fire heat and smoke from a fire area where the adjacent fire area contains redundant equipment? The concern is that the purging process would break the fire ban ier and could possibly cause smoke and heat damage to redundant equipment.
~Res onse:
Smoke and heat purge for each fire zone is specified in the pre-fire plans. SHNPP does not use portable exhaust fans for purging with the exception of areas not having permanently installed HVAC. Areas not having permanent HVAC are: 1) the Intake Screening Structure (this area is remote to the power block and does not present an exposure hazard to redundant equipment) and 2) areas adjacent to the former Unit 2 containment and fuel handling building. For these areas, smoke and heat will be exhausted directly to the atmosphere.
For the majority of the remaining areas, smoke and heat will be purged using the normal ventilation system. Some areas (e.g. cable spreading room, control room) have a dedicated purge system, which will be used to ventilate these areas. In both cases, no fire barriers will be breached so smoke and heat damage to redundant equipment will not occur. Should the fire cause the fire dampers to automatically close, these dampers will then be locally re-opened after the fire is extinguished to establish flow.
Should the effects of a fire be severe enough to isolate every branch of the HVAC system for an area, the damaged sections could be repaired or removed to establish an adequate flow path.
Access paths to each area are specified in the pre-fire plan. Access paths which could result in an exposure of redundant equipment in the adjacent room will be so noted in the plan so that an alternate path will be used.
Question:
BTP 9.5-1, Section C.7.b states: "Peripheral rooms in the control room complex should have automatic suppression and should be separated from the control room by noncombustible construction with a fire resistance rating of one hour." How does the SHNPP meet this guidance?
~Res onse:
SHNPP control room fire area as shown in FSAR Figure 9.5A-10 is not provided with an automatic suppression system. This was found acceptable by the NRC in SER Supplement No. 2 dated 3une 1985. As shown in FSAR Figure 9.5A-10, the wall between the Main Control Board (MCB) area and the Main Terminal Cabinet/living quarters (MTC) area is not shown as a rated barrier. In our comparison to BTP 9.5-1 (NUREG-0800),
Section C.7.b, dated October 10, 1983, CPRL addressed this area. The MTC area is an extension of the MCB area. It is an integral part of the main control room habitability envelope. This MTC area (like the control room) contains redundant safe shutdown equipment, therefore, a fire in this area would require the plant to proceed to alternate shutdown per BTP 9.5-1 Section C.5.c. It is noteworthy to realize that the MTC area is separated from the MCB area by 0-feet thick concrete walls. Additionally, the HVAC is (3596PPC/ccc )
 
4 ~
heavy gauge seismic Category l duct work. The HVAC return from the MTC area passes through the MCB area but has no openings in the MCB area. The other areas (i.e., office, kitchen area), when in use, will be occupied by personnel trained and knowledgeable in fire protection. The control room cotnplex is continuously manned with licensed operators that are knowledgeable in emergency response, plant systems and safe shutdown procedures. The walls that bound the office/kitchen from the MTC area are seismic block walls that provide equivalent one-hour protection. (Penetrations, doors, etc., are not fire rated construction.) An automatic, single sprinkler head will be provided in the office/kitchen area to provide additional protection. The following will be incorporated in the design of this sprinkler:
I)   The source of water    will be'potable water.
: 2)   One-inch copper tubing will be used.
: 3)     Non-seismic rod and clevis will be used to support the copper piping.
: 0)   A manual isolation globe valve and two check valves will be used.
: 5)   A flow alarm will be provided.
In summary, CPRL provides adequate protection for the MTC and the office/kitchen areas of the main control room complex for the following reasons:
l)   Alternate shutdown is provided for a disabling fire in the MTC area (regardless of the genesis of the fire).
: 2)   The control room complex is continuously manned by licensed operators knowledgeable in fire protection and safe shutdown procedures.
: 3)   A single, automatic sprinkler head will be provided in the office/kitchen area.
: 0)   A hose station is located in the MTC area.
: 5)   The wall between the MTC and office/kitchen is a seismic block wall which     will aid in containing a fire.
: 6)     HVAC return duct from the MTC area is heavy gauge seismic Category       l duct work.
The above stated fire protection features, training and design provide defense in-depth to ensure that the safety of the plant is maintained for any potential fire in the MTC room.
(3596PPC/ccc)}}

Latest revision as of 21:39, 23 February 2020

Forwards Requested Addl Info Re Fire Protection.Smoke & Heat Purge for Each Fire Zone Specified in Prefire Plans. Portable Exhaust Fans Not Used for Purging W/Exception of Areas Not Having Permanently Installed HVAC
ML18019A769
Person / Time
Site: Harris Duke Energy icon.png
Issue date: 04/04/1986
From: Cutter A
CAROLINA POWER & LIGHT CO.
To: Harold Denton
Office of Nuclear Reactor Regulation
References
NLS-86-101, NUDOCS 8604080274
Download: ML18019A769 (6)


Text

'REGULATORY FORMATION DISTRIBUTION S M (RIDS)

ACCESSION NBR: 8b04080274 DOC. DATE: 8b/04/04 NOTARIZED: NO DOCKET 0 FAC IL'0-400 Shearon Harris Nuclear Power Planti Unit ii Carolina 05000400 AUTH. NAME AUTHOR AFFILIATION CUTTERi A. B, Carolina Power h Light Co.

REC IP. NAME RECIPIENT AFFILIATION DENTON> H. R. Office of Nuclear Reactor Regulationi Director <post 851125

SUBJECT:

Forwards requested addi info re fire protection. Smoke 5 heat purge for each fire zone specified in pre-fire plans.

Portable exhaust fans not used for purging w/exception of areas not having permanently installed HVAC.

DISTRIBUTION CODE: AOObD COPIES RECEIVED: LTR ENCL SIZE:

TITLE: OR Submittal: Fire Protection NOTES: Application for permit renewal filed. 05000400 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PWR-A PD2 PD 01 3 3 BUCKLEY'S B 1 1 INTERNAL: ADM/LFMB 1 KLD/HDS1 1 0 IE WHITNEY' 1 1 NRR BWR DIR 1 1 NRR PWR-A DIR 1 1 NRR P WR-B D IR 1 NRR STANGa J 07 2 2 E ILi JOb 1 0 NRR/DHFT DIR 1 1 REQ ILE 04 1 1 RGN2 1 1 EXTERNAL: 24X 1 1 LPDR 03 1 1 NRC PDR 02 1 1 NSIC 05 1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 20 ENCL 17

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SNK Carolina Power & LIght Company SERIAL: NLS-86-101 APR 4 1986 Mr. Harold g. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 - DOCKET NO.50-000 FIRE PROTECTION - ADDITIONALINFORMATION

Dear Mr. Denton:

Carolina Power R Light Company (CPRL) has been requested to provide additional information concerning the following fire protection issues:

1) Method of post-fire smoke and heat purge.
2) Conformance with the guidance of Branch Technical Position 9.5-1, Section C.7.b, Control Room Complex. pro'vides the information requested. Should you have any questions concerning this letter, contact Mr. Patrick P. Carier at (919) 836-8165.

A. B. Cutter - Vice President Nuclear Engineering R Licensing ABC/PPC/rtj (3596PPC)

Attachment Cct Mr. B. C. Buckley (NRC) Mr. Wells Eddleman Mr. G. F. Maxwell (NRC-SHNPP) Mr. 3ohn D. Runkle Dr. 3. Nelson Grace (NRC-RII) Dr. Richard D. Wilson Mr. Travis Payne (KUDZU) Mr. G. O. Bright (ASLB)

Mr. Daniel F. Read (CHANGE/ELP) Dr. 3. H. Carpenter (ASLB)

Wake County'Public Library Mr. 3. L. Kelley (ASLB)

Mr. H. A. Cole 8~OOOSon4 S6040~

PDR ADOCK 05000000 F PDR

'11 Fayettevilte Street ~ P. O. Box 1551 ~ Raleigh. N. C. 27602

ATTACHMENT 1 Question:

How will Shearon Harris Nuclear Power Plant (SHNPP) ventilate post-fire heat and smoke from a fire area where the adjacent fire area contains redundant equipment? The concern is that the purging process would break the fire ban ier and could possibly cause smoke and heat damage to redundant equipment.

~Res onse:

Smoke and heat purge for each fire zone is specified in the pre-fire plans. SHNPP does not use portable exhaust fans for purging with the exception of areas not having permanently installed HVAC. Areas not having permanent HVAC are: 1) the Intake Screening Structure (this area is remote to the power block and does not present an exposure hazard to redundant equipment) and 2) areas adjacent to the former Unit 2 containment and fuel handling building. For these areas, smoke and heat will be exhausted directly to the atmosphere.

For the majority of the remaining areas, smoke and heat will be purged using the normal ventilation system. Some areas (e.g. cable spreading room, control room) have a dedicated purge system, which will be used to ventilate these areas. In both cases, no fire barriers will be breached so smoke and heat damage to redundant equipment will not occur. Should the fire cause the fire dampers to automatically close, these dampers will then be locally re-opened after the fire is extinguished to establish flow.

Should the effects of a fire be severe enough to isolate every branch of the HVAC system for an area, the damaged sections could be repaired or removed to establish an adequate flow path.

Access paths to each area are specified in the pre-fire plan. Access paths which could result in an exposure of redundant equipment in the adjacent room will be so noted in the plan so that an alternate path will be used.

Question:

BTP 9.5-1, Section C.7.b states: "Peripheral rooms in the control room complex should have automatic suppression and should be separated from the control room by noncombustible construction with a fire resistance rating of one hour." How does the SHNPP meet this guidance?

~Res onse:

SHNPP control room fire area as shown in FSAR Figure 9.5A-10 is not provided with an automatic suppression system. This was found acceptable by the NRC in SER Supplement No. 2 dated 3une 1985. As shown in FSAR Figure 9.5A-10, the wall between the Main Control Board (MCB) area and the Main Terminal Cabinet/living quarters (MTC) area is not shown as a rated barrier. In our comparison to BTP 9.5-1 (NUREG-0800),

Section C.7.b, dated October 10, 1983, CPRL addressed this area. The MTC area is an extension of the MCB area. It is an integral part of the main control room habitability envelope. This MTC area (like the control room) contains redundant safe shutdown equipment, therefore, a fire in this area would require the plant to proceed to alternate shutdown per BTP 9.5-1 Section C.5.c. It is noteworthy to realize that the MTC area is separated from the MCB area by 0-feet thick concrete walls. Additionally, the HVAC is (3596PPC/ccc )

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heavy gauge seismic Category l duct work. The HVAC return from the MTC area passes through the MCB area but has no openings in the MCB area. The other areas (i.e., office, kitchen area), when in use, will be occupied by personnel trained and knowledgeable in fire protection. The control room cotnplex is continuously manned with licensed operators that are knowledgeable in emergency response, plant systems and safe shutdown procedures. The walls that bound the office/kitchen from the MTC area are seismic block walls that provide equivalent one-hour protection. (Penetrations, doors, etc., are not fire rated construction.) An automatic, single sprinkler head will be provided in the office/kitchen area to provide additional protection. The following will be incorporated in the design of this sprinkler:

I) The source of water will be'potable water.

2) One-inch copper tubing will be used.
3) Non-seismic rod and clevis will be used to support the copper piping.
0) A manual isolation globe valve and two check valves will be used.
5) A flow alarm will be provided.

In summary, CPRL provides adequate protection for the MTC and the office/kitchen areas of the main control room complex for the following reasons:

l) Alternate shutdown is provided for a disabling fire in the MTC area (regardless of the genesis of the fire).

2) The control room complex is continuously manned by licensed operators knowledgeable in fire protection and safe shutdown procedures.
3) A single, automatic sprinkler head will be provided in the office/kitchen area.
0) A hose station is located in the MTC area.
5) The wall between the MTC and office/kitchen is a seismic block wall which will aid in containing a fire.
6) HVAC return duct from the MTC area is heavy gauge seismic Category l duct work.

The above stated fire protection features, training and design provide defense in-depth to ensure that the safety of the plant is maintained for any potential fire in the MTC room.

(3596PPC/ccc)