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| issue date = 08/08/1990
| issue date = 08/08/1990
| title = Forwards Addl Info Re Util Request for Exemption from Separation Criteria of 10CFR50,App R,Section III.G.2 Re Containment Air Room
| title = Forwards Addl Info Re Util Request for Exemption from Separation Criteria of 10CFR50,App R,Section III.G.2 Re Containment Air Room
| author name = SLADE G B
| author name = Slade G
| author affiliation = CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.),
| author affiliation = CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.),
| addressee name =  
| addressee name =  
Line 18: Line 18:


=Text=
=Text=
{{#Wiki_filter:1 . .... consumers Power POW ERi Nii PROliRESS Palisades Nuclear Plant: 27780 Blue Star Memorial Highway, Covert, Ml 49043 August 8, 1990 Nucl.ear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255 -LICENSE DPR-20 -PALISADES PLANT -CONTAINMENT AIR ROOM -10CFR50 APPENDIX R EXEMPTION REQUEST -ADDITIONAL INFORMATION GB Slade General Manager Consumers Power Company (CPC) letter dated October 4, 1985, requested an exemption from the separation criteria of 10CFR50 Appendix R, Section III.G.2 for the pressure and level transmitters in the Containment Air Room. Subsequently, after discussion with the NRC staff, our January 11, 1989 letter proposed Appendix R compliance for the Containment Air Room using post-fire safe shutdown methodology similar to that methodology which could be used after a Main Steam Line Break (MSLB) inside containment.
{{#Wiki_filter:1
If used as an Appendix R compliance strategy, this methodology could require exemptions from two other Appendix R criteria (III.G.3 & III.L.2).
. *~t,*~ ....
After further study, the NRC staff determined that neither the October 4, 1985 nor the January 11, 1989 Exemption Request contained enough substantiation to allow an exemption.
consumers Power                                                 GB Slade General Manager POWERiNii MICHlliAN~S PROliRESS Palisades Nuclear Plant: 27780 Blue Star Memorial Highway, Covert, Ml 49043 August 8, 1990 Nucl.ear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
CPC then decided to install fixed suppression to bring the area into compliance with Section III.G.2 and committed to install the suppression system during the 1990 Refueling Outage. Because of potential containment sump level problems caused by the suppression system actuating during postulated transients, intricate shutoff controls of the fire water made the installation more expensive than previously estimated.
CONTAINMENT AIR ROOM - 10CFR50 APPENDIX R EXEMPTION REQUEST - ADDITIONAL INFORMATION Consumers Power Company (CPC) letter dated October 4, 1985, requested an exemption from the separation criteria of 10CFR50 Appendix R, Section III.G.2 for the pressure and level transmitters in the Containment Air Room.
Therefore, after extensive discussion with the NRC staff, it was mutually decided that if CPC would further analyze the effect of a fire using state-of-the-art methods and would still conclude that a credible worst case fire could not prevent post-fire safe shutdown, the staff would re-evaluate CPC's October 4, 1985 exemption request. Also, it was agreed that the planned installation of a fixed suppression system could wait until the exemption request re-evaluation is complete.
Subsequently, after discussion with the NRC staff, our January 11, 1989 letter proposed Appendix R compliance for the Containment Air Room using post-fire safe shutdown methodology similar to that methodology which could be used after a Main Steam Line Break (MSLB) inside containment. If used as an Appendix R compliance strategy, this methodology could require exemptions from two other Appendix R criteria (III.G.3 & III.L.2).
Thus, if installation is still required, it will be delayed until a shutdown of sufficient length after the 1990 Refueling Outage. Attachment 1, analysis EA-GWS-90-002, is CPC's state-of-the-art re-analysis of the effect of a Containment Air Room fire. The analysis uses the Hazard I Fire Assessment Method which is approved by the National Institute of Standards and Technology, assumes very conservative amounts of combustibles
After further study, the NRC staff determined that neither the October 4, 1985 nor the January 11, 1989 Exemption Request contained enough substantiation to allow an exemption. CPC then decided to install fixed suppression to bring the area into compliance with Section III.G.2 and committed to install the suppression system during the 1990 Refueling Outage. Because of potential containment sump level problems caused by the suppression system actuating during postulated transients, intricate shutoff controls of the fire water made the installation more expensive than previously estimated. Therefore, after extensive discussion with the NRC staff, it was mutually decided that if CPC would further analyze the effect of a fire using state-of-the-art methods and would still conclude that a credible worst case fire could not prevent post-fire safe shutdown, the staff would re-evaluate CPC's October 4, 1985 exemption request. Also, it was agreed that the planned installation of a fixed suppression system could wait until the exemption request re-evaluation is complete. Thus, if installation is still required, it will be delayed until a shutdown of sufficient length after the 1990 Refueling Outage.
Attachment 1, analysis EA-GWS-90-002, is CPC's state-of-the-art re-analysis of the effect of a Containment Air Room fire. The analysis uses the Hazard I Fire Assessment Method which is approved by the National Institute of Standards and Technology, assumes very conservative amounts of combustibles


Regulatory Commission Palisades Plant lOCFRSO Exemption Req -Add Info Draft and rate of combustion, and concludes that a credible worst case fire in the Containment Air Room would leave sufficient instruments operable to safely shutdown the plant. In view of the above additional information, CPC again requests that the Containment Air Room be exempted from the separation criteria of lOCFRSO Appendix R, Section III.G.2. This request is made under the provisions of lOCFRS0.12 (a)(2)(ii) in that application of the requirements of Appendix R, Section III.G.2 in these particular circumstances is not necessary to achieve the underlying purpose of the rule. OS< --\L::s Gerald B Slade General Manager Palisades Nuclear Plant CC: Administrator  
Nu~lear  Regulatory Commission                                               2 Palisades Plant 10CFRSO Exemption Req - Add Info Draft and rate of combustion, and concludes that a credible worst case fire in the Containment Air Room would leave sufficient instruments operable to safely shutdown the plant.
-Region III NRC resident Inspector  
In view of the above additional information, CPC again requests that the Containment Air Room be exempted from the separation criteria of 10CFRSO Appendix R, Section III.G.2. This request is made under the provisions of 10CFRS0.12 (a)(2)(ii) in that application of the requirements of Appendix R, Section III.G.2 in these particular circumstances is not necessary to achieve the underlying purpose of the rule.
-Palisades OC0790-0060-NL04 2
OS<         --\L::s ~
OC0790-0060-NL04 ATTACHMENT 1 Consumers Power Company Palisades Plant Docket 50-255 ANALYSIS OF THE EFFECT OF A FIRE ON SAFETY RELATED INSTRUMENTS IN THE CONTAINMENT AIR ROOM August 8, 1990 19 Pages   
Gerald B Slade General Manager Palisades Nuclear Plant CC:   Administrator - Region III NRC resident Inspector - Palisades OC0790-0060-NL04
., .. @).CONSUMERS  
 
-POWER Palisades Nuclear Plant Engineering Analysis Work Sheet GWS-90-002 l'OUIERIN6 MICHl6RN'S l'R06RESS Sheet __ 1 __ of _ __._19..___
ATTACHMENT 1 Consumers Power Company Palisades Plant Docket 50-255 ANALYSIS OF THE EFFECT OF A FIRE ON SAFETY RELATED INSTRUMENTS IN THE CONTAINMENT AIR ROOM August 8, 1990 19 Pages OC0790-0060-NL04
Title Analysis of the effect of a fire on safety related instruments in the Containment Air Room. INITIATION AND REVIEW Rev Initiated Initiator Review Method Check ( II' ) Technically Reviewed Reviewer # Appd Alt Det Qual Appd Description By .\ Date By Cale Rvw Test By Date Bx ,,,..., 0 Original Issue GWSle'eP0r 8/6/90  
 
/ ;;,u. )<j. IZ./ /J-7-?CI V' Reference/Comment OBJECTIVE The purpose of this analysis is to show the impact a fire in the Containment Air Room would have on safety related instruments located in that room. This analysis will show that the affect on the instruments will be small enough such that sufficient instruments will be available to safely shut down the plant. ANALYSIS INPUT 1. Hazard I Rre Assessment Method, Version 1.0 National Institute of Standards and Technology, May 1989. 2. Various plant drawings showing room layout, equipment locations, conduit, cable and tubing routings.
  - @)             .CONSUMERS POWER l'OUIERIN6 MICHl6RN'S l'R06RESS Palisades Nuclear Plant Engineering Analysis Work Sheet EA-    GWS-90-002 Sheet __1__ of _ __._19..___
: 3. SFPE Handbook of Rre Protection Engineering, Copyright 1988, Page 2-14. 4. NUREG/CR-5384, SAND89-1359, A Summary of Nuclear Power Plant Fire Safety Research at Sandia National Laboratories, 1975-1987.
Title     Analysis of the effect of a fire on safety related instruments in the Containment Air Room.
INITIATION AND REVIEW Rev                                     Initiated         Initiator Review Method Check ( II' )   Technically Reviewed   Reviewer Appd       Alt     Det     Qual                                 Appd Date Description             ,,,...,.\
By                      By     Cale     Rvw     Test           By           Date     Bx 0           Original Issue     GWSle'eP0r 8/6/90       ~'}V                  /               ;;,u. )<j. IZ./ /J-7-?CI ~
V' Reference/Comment OBJECTIVE The purpose of this analysis is to show the impact a fire in the Containment Air Room would have on safety related instruments located in that room. This analysis will show that the affect on the instruments will be small enough such that sufficient instruments will be available to safely shut down the plant.
ANALYSIS INPUT
: 1. Hazard I Rre Assessment Method, Version 1.0 National Institute of Standards and Technology, May 1989.
: 2. Various plant drawings showing room layout, equipment locations, conduit, cable and tubing routings.
: 3. SFPE Handbook of Rre Protection Engineering, Copyright 1988, Page 2-14.
: 4. NUREG/CR-5384, SAND89-1359, A Summary of Nuclear Power Plant Fire Safety Research at Sandia National Laboratories, 1975-1987.
: 5. EPRI NP-1881, Categorization of Cable Flammability Intermediate-Scale Fire Tests of Cable Tray Installations.
: 5. EPRI NP-1881, Categorization of Cable Flammability Intermediate-Scale Fire Tests of Cable Tray Installations.
: 6. Generic Letter86-10, Implementation of Fire Protection Requirements, April 24, 1986 7. Licensing correspondence pertaining to ttie Containment Air Room. 8. Development and Results of a Test Program to Demonstrate Compliance with IEEE Std. 384 and R.G. 1.75 Electrical Separation Requirements, IEEE Power Engineering Review, June 1987.
: 6. Generic Letter86-10, Implementation of Fire Protection Requirements, April 24, 1986
' cti>> CONSUMERS . POWER POIDERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET Sheet Rev# M
: 7. Licensing correspondence pertaining to ttie Containment Air Room.
:O::"'"Af:'C:C:
: 8. Development and Results of a Test Program to Demonstrate Compliance with IEEE Std. 384 and R.G. 1.75 Electrical Separation Requirements, IEEE Power Engineering Review, June 1987.
ASSUMPTIONS
 
' cti>>
CONSUMERS POWER POIDERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 2    of _ _
0 19 M IC:Hll:A"'1'~ :O::"'"Af:'C:C:
Rev#
Reference/Comment ASSUMPTIONS
: 1. A cable tray fire is the only type of fire that needs to be considered for the following reasons:
: 1. A cable tray fire is the only type of fire that needs to be considered for the following reasons:
* Access to this area is severely limited during operations.
* Access to this area is severely limited during operations. Personnel entering containment dress and undress outside of containment. There are no "step-off" pads and no discarded Anti-Cs inside of containment during operation. Everything is stored or discarded outside of containment when the plant is operating.
Personnel entering containment dress and undress outside of containment.
* Strict administrative controls dictate that all loose material be removed from containment prior to startup to prevent containment sump plugging and transient fires.
There are no "step-off" pads and no discarded Anti-Cs inside of containment during operation.
Since controls are in place to remove the risk of transient fires during operation and the only major fixed combustible is cable, a cable tray fire is the only fire that needs to be considered.
Everything is stored or discarded outside of containment when the plant is operating.
: 2. Fires that occur during plant operations are considered worst case since that is the time the instruments would be needed to safely shut down.
* Strict administrative controls dictate that all loose material be removed from containment prior to startup to prevent containment sump plugging and transient fires. Since controls are in place to remove the risk of transient fires during operation and the only major fixed combustible is cable, a cable tray fire is the only fire that needs to be considered.
: 3. A worst case fire involves the cables in one channel of cable trays only. By the use of cable tray fire stops and other protective features and controls, it can be assumed that one train of instrumentation circuits will be free of fire damage for anticipated fires inside containment.
: 2. Fires that occur during plant operations are considered worst case since that is the time the instruments would be needed to safely shut down. 3. A worst case fire involves the cables in one channel of cable trays only. By the use of cable tray fire stops and other protective features and controls, it can be assumed that one train of instrumentation circuits will be free of fire damage for anticipated fires inside containment.
This has been agreed to by the NRC Staff and documented in our exemption request dated 7/23/85.
This has been agreed to by the NRC Staff and documented in our exemption request dated 7/23/85. 4. Narrow range (0-100%) Steam Generator level indication is sufficient for safe shutdown.
: 4. Narrow range (0-100%) Steam Generator level indication is sufficient for safe shutdown.
This is acceptable because a LOCA or MSLB is not considered to be occurring at the same time as a fire. 5. Level indication in one steam generator is sufficient for safe shutdown.
This is acceptable because a LOCA or MSLB is not considered to be occurring at the same time as a fire.
Again because a LOCA or MSLB is not occurring simultaneously.
: 5. Level indication in one steam generator is sufficient for safe shutdown. Again because a LOCA or MSLB is not occurring simultaneously.
ANALYSIS This analysis for a fire in the Containment Air Room is organized as follows: 1. Description of Room 2. Likelihood of a fire. 3. Type of a fire. 4. Consequences of a fire. GWS-90-002 2 of __ 19 __ 0 Reference/Comment 
ANALYSIS This analysis for a fire in the Containment Air Room is organized as follows:
.. @)CONSUMERS
: 1. Description of Room
* POWER POIDERIN6 Descrjptjon of Room Palisades Nuclear Plant ANAL VSIS CONTINUATION SHEET Sheet Rev# The room is oddly shaped with a 13 1/2 foot high ceiling. Total volume is approximately 14,420 cubic feet. The walls, floors and ceiling are constructed of poured, reinforced concrete.
: 2. Likelihood of a fire.
The northeast corner contains a metal staircase.
: 3. Type of a fire.
The stairs go up only. The area is well ventilated.
: 4. Consequences of a fire.
Air flow is out of the room. The cable trays in the room are lightly loaded. The majority of the cable trays located near the instruments contain small gauge instrumentation cables. Table 1 has a listing of the cable trays in this room along with their loading obtained from the circuit and raceway schedule.
 
Figure 1 shows a 3-D perspective of the room with approximate locations of the raceways.
  * @)          CONSUMERS POWER POIDERIN6 MICHISRN'~ PRBSRF~~
The flow of air in the room is from the louver at the 590' elevation up the stairwell and through the door on the 607' elevation.
Palisades Nuclear Plant ANAL VSIS CONTINUATION SHEET EA-Sheet Rev#
Figure 2 with views A through F is a plan view of the room with the approximate locations of the various instrumerits in this room. Table 1 RACEWAY CABLE SIZE Cinches) LENGTH %Fill CABLE VOL IME CcufO GAUGE HEIGHT WIDTH (Feet) Ria ht Left CP226 (R) AWG14 4.00 6.00 25.00 18.10% 0.75 CV226 (R) AWG16 4.00 6.00 25.00 6.10% 0.25 CP216 (L) AWG12-14 4.00 6.00 40.00 11.90% 0.79 CV216 (L) AWG16 4.00 6.00 40.00 11.10% 0.74 CV224 (R) AWG16 4.00 6.00 25.00 10.30% 0.43 CP224 (R) AWG12-14 4.00 6.00 25.00 17.10% 0.71 4CP224 (R) AWG14 4.00 6.00 22.00 2.30% 0.08 4CV224 (R) AWG16 4.00 6.00 22.00 3.70% 0.14 CP214 (L) AWG12-14 4.00 6.00 20.00 11.90% 0.40 CV214 (L) AWG14-16 4.00 6.00 20.00 18.50% 0.62 CP212 (L) AWG12-14 4.00 6.00 20.00 11.90% 0.40 CV212 (L) AWG14-16 4.00 6.00 20.00 22.10% 0.74 CP222 (R) AWG12-14 4.00 6.00 20.00 17.10% 0.57 CV222 (R) AWG16 4.00 6.00 20.00 16.00% 0.53 4CP222 (R) AWG14 4.00 6.00 16.00 2.30% 0.06 4CV222 (R) AWG16 4.00 6.00 16.00 9.20% 0.25 3CP212 (L) AWG12-14 4.00 6.00 14.00 1.20% 0.03 3CV212 (L) AWG14 4.00 6.00 14.00 14.40% 0.34 CP202 AWG2-14 4.00 12.00 25.00 18.20% 1.52 1.52 CP204 AWG2-14 4.00 12.00 23.00 16.70% 1.28 1.28 4CV180 (R) AWG16 4.00 6.00 10.00 0.50% 0.01 CV180 (R) AWG16 4.00 6.00 6.00 5.90% 0.06 CV170 (R) AWG16 4.00 12.00 12.00 3.00% 0.12 4CP210 (R) AWG14 4.00 6.00 6.00 1.70% 0.02 4CV210 (R) AWG16 4.00 6.00 6.00 9.30% 0.09 CP210 (R) AWG1/0-14 4.00 16.00 5.00 25.00% 0.56 CV210 (R) AWG16 4.00 16.00 5.00 8.60% 0.19 3CP214 (L) AWG14 4.00 6.00 17.00 1.20% 0.03 3CV214 (L) AWG16 4.00 6.00 17.00 13.10% 0.37 Total volume 1n cub1c feet= 7.62 7.25 -GWS-90-002 I 3 of 19 0 Reference/Comment Reference 7 
GWS-90-002 3    of 0
.. @>> CONSUMERS
19 I
* POWER
Reference/Comment Descrjptjon of Room The room is oddly shaped with a 13 1/2 foot high ceiling. Total volume is approximately 14,420 cubic feet. The walls, floors and ceiling are constructed of poured, reinforced concrete. The             Reference 7 northeast corner contains a metal staircase. The stairs go up only. The area is well ventilated.
* POIDERIN6 590' Figure 1 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET PALISADES NUCLEAR PLANT CONTAINMENT AIR ROOM CABLE TRAYS OPENING TO THE REST OF CONTAIN MEN CP212 QY.....---...
Air flow is out of the room.
c 603'-6" EA-GWS-90-002 Sheet 4 of _1_9 __ Rev# ___
The cable trays in the room are lightly loaded. The majority of the cable trays located near the instruments contain small gauge instrumentation cables.
Reference/Comment Reference 4 AIR INTAKE TO ROOM 
Table 1 has a listing of the cable trays in this room along with their loading obtained from the circuit and raceway schedule.
. . *o CONSUMERS
Figure 1 shows a 3-D perspective of the room with approximate locations of the raceways. The flow of air in the room is from the louver at the 590' elevation up the stairwell and through the door on the 607' elevation.
* POWER *. POUIERIN6
Figure 2 with views A through F is a plan view of the room with the approximate locations of the various instrumerits in this room.             Table 1 RACEWAY CABLE               SIZE Cinches)       LENGTH %Fill CABLE VOL IME CcufO GAUGE HEIGHT WIDTH               (Feet)                   Ria ht         Left CP226 (R)     AWG14         4.00     6.00     25.00     18.10%         0.75 CV226 (R)     AWG16         4.00     6.00     25.00       6.10%         0.25 CP216 (L)     AWG12-14       4.00     6.00     40.00     11.90%                       0.79 CV216 (L)     AWG16         4.00     6.00     40.00     11.10%                       0.74 CV224 (R)     AWG16         4.00     6.00     25.00     10.30%         0.43 CP224 (R)     AWG12-14       4.00     6.00     25.00     17.10%         0.71 4CP224 (R) AWG14             4.00     6.00     22.00       2.30%         0.08 4CV224 (R) AWG16             4.00     6.00     22.00       3.70%         0.14 CP214 (L)     AWG12-14       4.00     6.00     20.00     11.90%                       0.40 CV214 (L)     AWG14-16       4.00     6.00     20.00     18.50%                       0.62 CP212 (L)     AWG12-14       4.00     6.00     20.00     11.90%                       0.40 CV212 (L)     AWG14-16       4.00     6.00     20.00     22.10%                       0.74 CP222 (R)     AWG12-14       4.00     6.00     20.00     17.10%         0.57 CV222 (R)     AWG16         4.00     6.00     20.00     16.00%         0.53 4CP222 (R) AWG14             4.00     6.00     16.00       2.30%         0.06 4CV222 (R) AWG16             4.00     6.00     16.00       9.20%         0.25 3CP212 (L)     AWG12-14       4.00     6.00     14.00       1.20%                       0.03 3CV212 (L)     AWG14         4.00     6.00     14.00     14.40%                       0.34 CP202         AWG2-14       4.00     12.00     25.00     18.20%         1.52         1.52 CP204         AWG2-14       4.00     12.00     23.00     16.70%         1.28         1.28 4CV180 (R) AWG16             4.00     6.00     10.00       0.50%         0.01 CV180 (R)     AWG16         4.00     6.00       6.00       5.90%         0.06 CV170 (R)     AWG16         4.00     12.00     12.00       3.00%         0.12 4CP210 (R) AWG14             4.00     6.00       6.00       1.70%         0.02 4CV210 (R) AWG16             4.00     6.00       6.00       9.30%         0.09 CP210 (R)     AWG1/0-14     4.00     16.00       5.00     25.00%         0.56 CV210 (R)     AWG16         4.00     16.00       5.00       8.60%         0.19 3CP214 (L)     AWG14         4.00     6.00     17.00       1.20%                       0.03 3CV214 (L)     AWG16         4.00     6.00     17.00     13.10%                       0.37 Total volume 1n cub1c feet=             7.62         7.25
* Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET PALISADES NUCLEAR PLANT 'f::2_ CONTAINMENT AIR ROOM Ill( MCC No. 15 MCC No. 16 II 19*-o* Transformer No. 15 Transformer No. 16 EA-GWS-90-002 Sheet 5 of _...:....:19=----
 
Rev # ___ ....:;.o __ _ Reference/Comment
  @>>       CONSUMERS POWER
..... _1*-*=-6' Reference 4 43'-, * : * ...... ;. '1 . . -.. * ...... ; .. ,
* POIDERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 4    of _1_9_ _
42'-0" Figure 2 
Rev# _ _ _~o'---~
.. 'G CONSUMERS
Reference/Comment PALISADES NUCLEAR PLANT CONTAINMENT AIR ROOM Reference 4 CABLE TRAYS OPENING TO THE REST OF CONTAIN MEN 603'-6" CP212
* POWER --l'OUJERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-GWS-90-002 Sheet 6 of __:.1.=...9--Rev I PT-101A Reference/Comment EL. 604' Figure 2 (Contd) PT\ 7751C 8 8 8 '8 8 T-0751 C LT lo2 EL. 601' PTi7528 riT-7520 LT --07,A L T--OJ52C
                      .:...w~~~1--11--~-  QY.....---...
* 8 8 8 8 . I . Reference 4
c CV2~2 590' AIR INTAKE TO ROOM Figure 1
&#xa9; PT-0751 .,.,.
 
PT-0704 EL. 590' LT-0700 EL. 600* ELEVATED -----------E-PLATFORM EL. 600' ----:3--
  *o CONSUMERS POWER
/ PT-0105A PT-01058 EL. 590' EL. 590' II D Right channel Left Channel
      *. POUIERIN6
.. EA-GWS-90-002
* Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 5      of _...:....:19=----
({>)CONSUMERS
Rev # _ _ _....:;.o_ __
* POWER , l'OIDERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET Sheet 7 of _ _.1 .... 9 __ Rev# ____ o ___ _ . --... -.... :-.. .:: .. . .... -8 I 8 I I ---I -=-CABLE TRAYS 8 8 8 I I 8 8 I I F Figure 2 (Contd) 8 8 8 8 8 8 8 EL. 603' 6" I I I II I I a a EL. 590' Table 2 shows the approximate horizontal distances between right and left channel transmitters in feet. The following observations can be made from this information:
                    'f::2_
Reference/Comment PALISADES NUCLEAR PLANT CONTAINMENT AIR ROOM             Ill(
                                                                          . . . . ._1*-*=-6' II     19*-o*
Reference 4 43'-
Transformer MCC No. 15        No. 15 Transformer MCC No. 16       No. 16
                                                    ,* : *...... ; . '1          *-...... ; ..,
~------------- 42'-0" -----------------~;:;.-!
Figure 2
 
  'G CONSUMERS POWER
          - - l'OUJERIN6 I
Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet      6 GWS-90-002 Rev #~~~~O=--~~-
of __:.1.=...
9- -
Reference/Comment EL. 604'                               Figure 2 (Contd)
                                                                ~~                          PT\           7751C LT-~2 8 LT-0~
8 8               '8 8         ~LT-0751 C LTlo2        EL. 601' PT- 101A PT-~52A          PT-~752C        PTi7528         r i T -7520                         Reference 4 LT--07,A     ~  LT--OJ52C *     ~~t7~B          <'~520 8 8 8 8 . I                               .     ~
PT-0704 PT-~
                                                          ~FT-0704
                                                          ~FT--0700 EL. 590'
                                                        &#xa9; PT-0751 ~ .,.,.
PT~lil ~-~048                LT-0700 LT075~ ~LT-0100 1
7510 LT-0704~            ~
EL. 600
* ELEVATED                                        EL. 600'
                  ---------                      --E- PLATFORM   ----:3-- ~--~-~---
                                                                              /        8~
PT-0105A            PT-01058 EL. 590'                                                     EL. 590'
                                                                            ~--------
II Right channel D
Left Channel
 
({>)CONSUMERS POWER Palisades Nuclear Plant               EA-Sheet GWS-90-002 7     of _ _.1....
9__
ANALYSIS CONTINUATION SHEET
              , l'OIDERIN6                                                                  Rev# _ _ _ _o____
MIC:Hll:RAI'~ ~=~
Reference/Comment Figure 2 (Contd) 8 I 8 I                    .:: .. ~
                                            ~
                                              .     .... -                               EL. 603' 6" Reference 4 I
I                             ~
                                                  - -=-                                       I I
IL. 599' 7" EL. 598' 5" CABLE TRAYS       ~
8 8 8 8 I II I 8 8             8            I               I                 8                     I 8 8             I I                                8 8                   aa EL. 590' F
Table 2 shows the approximate horizontal distances between right and left channel transmitters in feet. The following observations can be made from this information:
: 1. Redundant steam generator pressure transmitters are.27 ft apart (PT-0751A/PT-0752D).
: 1. Redundant steam generator pressure transmitters are.27 ft apart (PT-0751A/PT-0752D).
: 2. Redundant narrow range steam generator level transmitters are 16 ft apart for SG-A, (LT-0751A/LT-0751 D) and 7 ft apart for SG-8 (LT-0752A/LT-0752D).
: 2. Redundant narrow range steam generator level transmitters are 16 ft apart for SG-A, (LT-0751A/LT-0751 D) and 7 ft apart for SG-8 (LT-0752A/LT-0752D).
: 3. Redundant wide range steam generator level transmitters are within one ft of each other. This does not prevent safe shutdown since the operator can modulate the Auxiliary Feedwater flow and keep the SG level within the narrow range. The wide range level transmitters are a minimum of 9 ft from their redundant narrow range instruments (LT-0757A/LT-0751 D, L T-0758A/LT-0752D, LT-07578/LT-0751A, L T-07588/L T-0752C).
: 3. Redundant wide range steam generator level transmitters are within one ft of each other.
: 4. Wide range pressurizer level transmitters are 1 O ft apart (L T-0102/L T-0103). 5. Although redundant wide range pressurizer pressure transmitters (PT-0105A/PT-01058) are located adjacent to each other, they are separated from redundant narrow range pressure transmitters by 12 ft (PT-0105A/PT-01018) and 12 ft (PT-01058/PT-0101A).
This does not prevent safe shutdown since the operator can modulate the Auxiliary Feedwater flow and keep the SG level within the narrow range. The wide range level transmitters are a minimum of 9 ft from their redundant narrow range instruments (LT-0757A/LT-0751 D, LT-0758A/LT-0752D, LT-07578/LT-0751A, LT-07588/LT-0752C).
If both wide range pressurizer pressure transmitters were rendered inoperable, one of the narrow range pressure transmitters could be calibrated over the wide range before the approach to cold shutdown is made. Since cable trays are the only combustible in the room, and assuming one train of cables is the source of the fire, , the relative position of right and left channel redundant instruments to each other is not as important as their position relative to the hot gases which could be generated if one train of cables burned. Reference/Comment Reference 4 IL. 599' 7" EL. 598' 5" 
: 4. Wide range pressurizer level transmitters are 1Oft apart (LT-0102/LT-0103).
. . . G. , CONSUMERS POWER POIUERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-GWS-90-002 Sheet 8 of _1_9 __ Rev# ____ o ___ _ Right Channel Instruments Steam generator Pressure Table 2 Q) > (I) ....I ..... LT-0752A 10 9 0 iii LT-0752C 10 9 ..... (I) c: 25 .5 (I) LT-0757A 9 10 27 (.!) E LT-0758A 6 7 23 25 Cl! (I) LT-0701 14 15 25 27 Ci5 LT-0702 en ...... c Q) ::I (/) E (/) ::J .._ a.. ...... ..... en 0 c iii ..... Q) (I) c: c (I) c Cl cu E ..c Cl! () (I) U5 ;i: Q) ....I ::I (/) (/) a.. ..... (I) N *;:: PT-0105A ::I (/) PT-0101A (/) (I) ..... a.. Q) > (I) ....I ..... (I) N *;:: ::I (/) (/) a.. LikelibQQd Qf 8 Ei(e One aspect of this issue is the likelihood of a fire. During plant operation external sources of ignition are extremely unlikely.
: 5. Although redundant wide range pressurizer pressure transmitters (PT-0105A/PT-01058) are located adjacent to each other, they are separated from redundant narrow range pressure transmitters by 12 ft (PT-0105A/PT-01018) and 12 ft (PT-01058/PT-0101A). If both wide range pressurizer pressure transmitters were rendered inoperable, one of the narrow range pressure transmitters could be calibrated over the wide range before the approach to cold shutdown is made.
This leaves the possibility of a self initiated cable tray fire. As a result of fire research it has been found that for #12 AWG cables currents of from 120 to 130 amperes were required to induce open flaming. In full-scale testing, the intense period of fire activity persisted for between 40 and 240 seconds after which rapid reduction to self-extinguishment of the fire was observed.
Since cable trays are the only combustible in the room, and assuming one train of cables is the source of the fire, , the relative position of right and left channel redundant instruments to each other is not as important as their position relative to the hot gases which could be generated if one train of cables burned.
In no case involving electrically initiated fires in rated low flame spread cables was propagation of the fire beyond the tray of fire origin observed.
 
Reference/Comment Pressurizer Level Reference 4 
      .G, CONSUMERS POWER POIUERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 8
.. e e Palisades Nuclear Plant EA-GWS-90-002  
Rev# _ _ _ _o of _1_9__
' 'fp)coNSUMERS POWER ANAL YSIS CONTINUATION SHEET Sheet __ 9_ of
Reference/Comment Right Channel Instruments Steam generator Pressure                           Pressurizer Level Table 2 Q)
-POUIERIN6 PRacar:rr Rev# O In other tests conducted, locked rotor amperes (LRA) were applied to test cables to judge their impact on target cables. One of the design criteria for the test program was that the worst-case electrically induced fault would be on a motor feeder circuit, because the majority of large loads, and the more potentially damaging ones, are motor loads. The most credible worst-case fault would be the sustained application of locked rotor amperes (LRA) to the test cables. This type of fault was selected because it is a typical condition, it can be postulated as having an extended duration, and its magnitude is large enough to cause damage to the fault cable and adjacent cables. To select the test cable, typical plant cable feeder sizes were tabulated along with the corresponding maximum LRA for each feeder, and the corresponding motor pigtail conductor size. Based on preliminary screening test data, a relationship was developed between LRA durations and fusing (open circuit) of the motor pigtail conductors.
(I)
Using this relationship in conjunction with data obtained from the screening tests, the worst-case fault cable was selected, and was used in the subsequent configuration tests. The selected worst-case cable was the cable with the highest temperature at the time its corresponding motor pigtails fused (open circuited).
          ....I
The tests demonstrated that when ignition occurred, the fire never propagated to an adjacent target cable even when both were touching.
            ..... LT-0752A 10 9 0
The fires that occurred were self-extinguishing when the electrical fault was interrupted.
iii (I)  LT-0752C 10   9 c:
The amount of smoke created by the overload was extremely dense and would be readily detected by the plant fire detection systems. The majority of the cable trays in the vicinity of the instruments contain only instrumentation cable which is fused to prevent the high currents necessary to ignite the cable. Should the fusing still allow high currents it is unlikely that surrounding cables or cable trays would be affected.
(I)
Also the smoke generated would activate the detectors very early into a problem. Type Of A Eire From the previous section it can be seen that the most likely type of fire would be a small extinguishing fire that would generate a lot of smoke. For the purposes of analysis, we will assume a much worse fire the type of which would be most likely initiated by an external source. The type of fire was determined using an equation developed by B.T. Lee in a study conducted in 1985. This research indicates that the peak full scale heat release rate(q) can be predicted according to bench scale heat release measurements  
(.!)
'fs . . " 'rs = 0.45
LT-0757A 9 10 25 27 .5 E     LT-0758A 6   7 23 25 Cl!
(I)
LT-0701 14 15 25 27 Ci5 LT-0702 en c         ~
Q)       ::I
(/)
E ~      (/)
::J
...... a.......
en 0 c       iii (I)
Q)        c:
c         (I) c         Cl cu       E
..c       Cl!
(I)
()
U5
;i:
Q)
....I   ~
::I
(/)
(/)
        ~
a..
(I)
N
::I      PT-0105A
(/)
(/)
(I)     PT-0101A a..
Q)
(I)
        ....I (I)
N
::I
(/)
(/)
        ~
a..
LikelibQQd Qf 8 Ei(e One aspect of this issue is the likelihood of a fire. During plant operation external sources of ignition are extremely unlikely. This leaves the possibility of a self initiated cable tray fire.
As a result of fire research it has been found that for #12 AWG cables currents of from 120 to Reference 4 130 amperes were required to induce open flaming. In full-scale testing, the intense period of fire activity persisted for between 40 and 240 seconds after which rapid reduction to self-extinguishment of the fire was observed. In no case involving electrically initiated fires in rated low flame spread cables was propagation of the fire beyond the tray of fire origin observed.
 
  ..                                     e                                               e
' 'fp)coNSUMERS    POWER Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-GWS-90-002 9 _ of --'1~9_
Sheet _ _
                  - POUIERIN6 MICHll:llAI'~    PRacar:rr                                                                 Rev#         O Reference/Comment In other tests conducted, locked rotor amperes (LRA) were applied to test cables to judge their impact on target cables. One of the design criteria for the test program was that the worst-case         Reference 8 electrically induced fault would be on a motor feeder circuit, because the majority of large loads, and the more potentially damaging ones, are motor loads. The most credible worst-case fault would be the sustained application of locked rotor amperes (LRA) to the test cables. This type of fault was selected because it is a typical condition, it can be postulated as having an extended duration, and its magnitude is large enough to cause damage to the fault cable and adjacent cables. To select the test cable, typical plant cable feeder sizes were tabulated along with the corresponding maximum LRA for each feeder, and the corresponding motor pigtail conductor size. Based on preliminary screening test data, a relationship was developed between LRA durations and fusing (open circuit) of the motor pigtail conductors. Using this relationship in conjunction with data obtained from the screening tests, the worst-case fault cable was selected, and was used in the subsequent configuration tests. The selected worst-case cable was the cable with the highest temperature at the time its corresponding motor pigtails fused (open circuited).
The tests demonstrated that when ignition occurred, the fire never propagated to an adjacent target cable even when both were touching. The fires that occurred were self-extinguishing when the electrical fault was interrupted. The amount of smoke created by the overload was extremely dense and would be readily detected by the plant fire detection systems.
The majority of the cable trays in the vicinity of the instruments contain only instrumentation cable which is fused to prevent the high currents necessary to ignite the cable. Should the fusing still allow high currents it is unlikely that surrounding cables or cable trays would be affected. Also the smoke generated would activate the detectors very early into a problem.
Type Of A Eire From the previous section it can be seen that the most likely type of fire would be a small self-extinguishing fire that would generate a lot of smoke.
For the purposes of analysis, we will assume a much worse fire the type of which would be most likely initiated by an external source.
The type of fire was determined using an equation developed by B.T. Lee in a study conducted in 1985. This research indicates that the peak full scale heat release rate(q)         can be       Reference 3 predicted according to bench scale heat release measurements                     'fs
                                          'rs =   0.45
* qbs
* qbs
* A where the bench scale heat release value is the peak measured under irradiance conditions of 60 kW/sq m, and A is the exposed tray area actively pyrolyzing.
* A where the bench scale heat release value (qb~) is the peak measured under irradiance conditions of 60 kW/sq m, and A is the exposed tray area actively pyrolyzing. The active pyrolysis area, in turn, is estimated based on the type of cable and its bench scale heat release rate which can be obtained from Figure 2-1 .18 of the SEPE Handbook of Eire Protection Engineering, which gives dA/dt as a function of     a".
The active pyrolysis area, in turn, is estimated based on the type of cable and its bench scale heat release rate which can be obtained from Figure 2-1 .18 of the SEPE Handbook of Eire Protection Engineering, which gives dA/dt as a function of a " . Thus, at any given time t, . A 'bs dA A(t) = o + cit
A 'bs dA Thus, at any given time t,       .
A(t) = o + cit
* t Using a conservative number 400kW/sq m for the bench scale heat release rate (322 is the mean for the ones listed) and 1.0sq rn/min. rate of flame coverage (obtained from Ref. 3 Figure 2-1.18). The fire shown in Table 3 was generated:
* t Using a conservative number 400kW/sq m for the bench scale heat release rate (322 is the mean for the ones listed) and 1.0sq rn/min. rate of flame coverage (obtained from Ref. 3 Figure 2-1.18). The fire shown in Table 3 was generated:
Reference/Comment Reference 8 Reference 3 
 
.. *o CONSUMERS Palisades Nuclear Plant ANAL VSIS CONTINUATION SHEET EA-GWS-90-002
  *o CONSUMERS POWER
* POWER Sheet 1 O of __ 1_9 __ . POUIERIN6 Rev# ____ o ___ _ Table3 0.00 0.00 0.0000 0.0000 30.00 0.25 1.5000 3.8333 64.10 60.00 0.63 3.8066 9.2155 154.10 90.00 1.02 6.1133 14.5976 244.10 120.00 1.40 8.4199 19.9797 334.10 150.00 1.79 10.7265 25.3619 424.10 180.00 2.17 13.0331 30.7440 514.10 210.00 2.56 15.3398 36.1261 604.10 240.00 2.94 17.6464 41.5082 694.10 270.00 3.33 19.9530 46.8904 784.10 300.00 3.71 22.2597 52.2725 874.10 330.00 4.09 24.5663 57.6546 964.10 360.00 4.48 26.8729 63.0368 1,054.10 390.00 4.86 29.1795 68.4189 1,144.10 420.00 5.25 31.4862 73.8010 1,234.10 450.00 5.63 33.7928 79.1832 l,324.10 480.00 6.02 36.0994 84.5653 1,414.10 510.00 6.40 38.4060 89.9474 1,504.10 540.00 6.79 40.7127 95.3296 1,594.10 600.00 7.55 45.3259 106.0938 1,774.10 630.00 7.94 47.6326 111.4760 1,864.10 660.00 8.32 49.9392 116.8581 1,954.10 780.00 9.86 59.1657 138.3866 2,314.10 900.00 11.40 68.3922 159.9151 2,674.10 1,080.00 0.00 0.0000 0.0000 0.00 This represents over 68 feet of 12 " wide cable tray with 50% fill involved in a fire. The volume at the end of the fire exceeds the total volume of either right or left channel cable trays in the Containment Air Room. This is considered a worst case fire. A slower burning fire is more likely however a slower fire would not produce as high a temperature as a faster fire. Conseguences of a Fjre Now that we have looked at the room configuration and at what we consider is a worst case fire, we can try to assess the impact this fire will have on instruments the operators need to safely shut down the plant. What we expect will happen is that hot air from the fire will travel along the ceiling and go up the stairway without having a negative impact on necessary instruments.
              . POUIERIN6 Palisades Nuclear Plant ANALVSIS CONTINUATION SHEET EA-Sheet GWS-90-002 1O Rev# _ _ _ _
To verify this we will use fire modeling program called Hazard I developed by the National Institute of Standards and Technology.
of __1_9__
Reference/Comment  
o____
. ' EA* GWS-90-002 ' .
Reference/Comment Table3 0.00         0.00           0.0000       0.0000 30.00       0.25           1.5000       3.8333           64.10 60.00       0.63           3.8066       9.2155         154.10 90.00         1.02         6.1133       14.5976         244.10 120.00         1.40         8.4199       19.9797         334.10 150.00         1.79         10.7265       25.3619         424.10 180.00       2.17         13.0331       30.7440         514.10 210.00       2.56         15.3398       36.1261         604.10 240.00         2.94         17.6464       41.5082         694.10 270.00         3.33         19.9530       46.8904         784.10 300.00         3.71         22.2597       52.2725         874.10 330.00       4.09         24.5663       57.6546         964.10 360.00       4.48         26.8729       63.0368         1,054.10 390.00       4.86         29.1795       68.4189         1,144.10 420.00         5.25         31.4862       73.8010         1,234.10 450.00         5.63         33.7928       79.1832         l,324.10 480.00         6.02         36.0994       84.5653         1,414.10 510.00         6.40         38.4060       89.9474         1,504.10 540.00         6.79         40.7127       95.3296         1,594.10 600.00         7.55         45.3259     106.0938         1,774.10 630.00         7.94         47.6326     111.4760         1,864.10 660.00         8.32         49.9392     116.8581         1,954.10 780.00         9.86         59.1657     138.3866         2,314.10 900.00       11.40         68.3922     159.9151         2,674.10 1,080.00       0.00         0.0000       0.0000           0.00 This represents over 68 feet of 12 " wide cable tray with 50% fill involved in a fire. The volume at the end of the fire exceeds the total volume of either right or left channel cable trays in the Containment Air Room. This is considered a worst case fire. A slower burning fire is more likely however a slower fire would not produce as high a temperature as a faster fire.
POWER Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET Sheet 11 of __ POWERING Rev # ____ o ___ _ The first step in using Hazard I to validate our theory of what happens for a fire in the Containment Air Room is to input the necessary parameters into the program. We will do this in two parts. First we will look at the main part of the Containment Air Room, then we will look at the stairway.
Conseguences of a Fjre Now that we have looked at the room configuration and at what we consider is a worst case fire, we can try to assess the impact this fire will have on instruments the operators need to safely shut down the plant.
Each area will be modeled separately.
What we expect will happen is that hot air from the fire will travel along the ceiling and go up the stairway without having a negative impact on necessary instruments. To verify this we will use fire modeling program called Hazard I developed by the National Institute of Standards and Technology.
The first parameter we input is the physical dimensions of the main part of the room. Figure 3 below shows what this room looks like to the computer.
 
Vent 1 represents the stairway going up. -Next we input the fire shown in table 2. Both the Heat Release Rate and the Area of the fire are input into Hazard I. Figure 3 The fire is located in the center of the room at a height of 9.8 feet. The ceiling floors and walls are all 6" thick concrete.
  ~ .    '
' . ~)CONSUMERS  POWER Palisades Nuclear Plant                      EA*
GWS-90-002 ANALYSIS CONTINUATION SHEET                     Sheet     11     of _ _1~9-POWERING                                                                     Rev # _ _ _ _    o____
Reference/Comment The first step in using Hazard I to validate our theory of what happens for a fire in the Containment Air Room is to input the necessary parameters into the program.
We will do this in two parts. First we will look at the main part of the Containment Air Room, then we will look at the stairway. Each area will be modeled separately.
The first parameter we input is the physical dimensions of the main part of the room. Figure 3 below shows what this room looks like to the computer. Vent 1 represents the stairway going up.
- Next we input the fire shown in table 2. Both the Heat Release Rate and the Area of the fire are input into Hazard I.
Figure 3 The fire is located in the center of the room at a height of 9.8 feet.
13' -6" The ceiling floors and walls are all 6" thick concrete.
Ambient conditions:
Ambient conditions:
Internal=
Internal= 100 degrees F External = 120 degrees F
100 degrees F External = 120 degrees F 13' -6" Reference/Comment GWS-90-002
 
'* c:f J CONSUMERS POWER Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET Sheet _1_2_ of __ 19 __ POWERIN6 Rev# O The results of running this fire model are shown in graphs 1 through 4. As can be seen from these graphs, there is a layer of extremely hot air near the ceiling, that .extends down two feet during the worst part of the fire.
    '* c:fJ              CONSUMERS POWER POWERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet _ 1_
Rev#
GWS-90-002 2_    of _ _
O 19_ _
Reference/Comment The results of running this fire model are shown in graphs 1 through 4. As can be seen from these graphs, there is a layer of extremely hot air near the ceiling, that .extends down two feet during the worst part of the fire.
* The lower layer of air in the room is significantly cooler than the upper layer. In addition, the wall temperature (which is where most of the instruments are mounted is also significantly cooler than the upper layer air temperature.
* The lower layer of air in the room is significantly cooler than the upper layer. In addition, the wall temperature (which is where most of the instruments are mounted is also significantly cooler than the upper layer air temperature.
HEAT RELEASE -2000 ..........
HEAT RELEASE
Q) (/J ca Q) Q) a: 1000 +-' ro Q) I Reference/Comment 0 0. 0 1000.0 2000.0 3000.0 400 .0 400 -0 300 ..........
    ~
(].) i.... :::::J co i.... Q) 200 a. E Q) I-100 0 0.0
    ~
* N = 1 Graph 1 Time (s) UPPER LA YER TEMPERATURES U Air Temp. 1 U Wall Temp. . . . , ... . . . .. .. . . . . .. .......................  
2000 Q)
-.. 1000.0 2000.0 3000.0 4000 0 N = 1 Graph 2 Time (s) e e Palisades Nuclear Plant ANAL VSIS CONTINUATION SHEET EA-Sheet GWS-90-002 13 of _19 __ ' G. CONSUMERS POWER . POUJERIN6 Rev# ___ o:__ __ -(.) -(]) .... :::J ca .... (]) a. E Q) 60.0 55.0 50.0 45.0 40.0 LOWER LAYER TEMPERATURES
(/J ca Q)
.. . . . ... . . . . . . .. . . . . 1 L Air Temp. 1 L Wall Temp.  
Q) a: 1000
-E --.c .Q> (]) -: 603' Q) >. ctS _J 601'-6" 0.0 1000.0 2000.0 3000.0 4000.0 N = 1 Graph 3 Time (s) . LA YER HEIGHT 1 u Ceilin El. 603'-6" 600' 0.0 1000.0 N = 1 2000.0 Time (s) Graph 4 3000.0 4000.0 Reference/Comment 
      +-'
' ' '* G CONSUMERS  
ro Q)
*POWER /POWERING Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-GWS-90-002 Sheet 14 of __ 19 __ Rev# ____ o ___ _ Now that we have modeled the main part of the room, we can model the stairwell area. Again, we input the physical dimensions of the stairway.
I 0
Figure 4 below shows what the stairway looks like to the computer.
: 0.                 1000.0                 2000.0               3000.0             400 .0 0                         *N = 1     Graph 1       Time (s)
Vent 1 represents the opening to the main part of the room. Vent 2 represents the opening to the rest of containment.
UPPER LA YER TEMPERATURES 400 U Air Temp.
Next we input the fire shown in table 2. Even though the fire will be in the main section of the room we will assume it is all contained in the stairway.
1 U Wall Temp.           .. .,
Again, both the Heat Release Rate and the Area of the fire are input into Hazard I. The other inputs to Hazard I were the same as the previous model. I I I I I I I I I I I I The fire is located against a wall at a height of 9.8 feet. I 34' . )-------------,,-
0.......... 300
l '/-I 20' 10' Figure 4 VENT2 6.5' The results of running this fire model are shown in graphs 5 through 8. As can be seen from these graphs, the layer of hot air, extends down to above elevation 607'. The lower layer of air in the stairwell is significantly cooler than the upper layer. In addition, the wall temperature (which is where the instruments are mounted is also significantly cooler than the upper layer air temperature).
(].)
Reference/Comment 
i....
** 't '@>)CONSUMERS POWER POUIER/N6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET HEAT RELEASE EA-GWS-90-002 Sheet 1 5 of __ 19_ Rev# 0 Reference/Comment 3000..-------
:::::J co i....
1--u--.-----------.-----------..-----------.
Q)            200 a.
2000 1000 0 0.0 1000.0 2000.0 3000.0 4000.0 N = 1 Time (s) Graph 5 UPPER LA YER TEMPERATURES 500 1 U AirTemp. 1 U Wall Temp. 400 -() -Q) '-300 :J ....... Cl> a. E 200 Cl> I-100 ...... .. . .. . . . . . .. . .. .. .. . . .. 0 0.0 1000.0 2000.0 3000.0 4000. N = 1 Time (s)
E Q)
* Graph 6
I-100                                ... . . . .. .. . . . .
;
0 0.0                1000.0               2000.0                 3000.0             4000 0 N =1     Graph 2 Time (s)
* POWER POWERING -(.) 50.0 -Cl) L.. :::::J '-45.0 E Cl) I-40.0 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET LOWER LAYER TEMPERATURES
 
.. 1 L Air Temp. . . ... . . . . . . . EA-GWS-90-002 Sheet 16 of __ 19_ Rev# 0-Reference/Comment . . . . ..... 1 L Wall Temp. 35.0
e                                   e
___ ___. 623' -E ::-619'-6" ..c 0) Cl) 616' Q) _J612'-6" 609' 0.0 -1000.0 2000.0 3000.0 4000.0 N = 1 Graph 7 Time (s) LA YER HEIGHT 1 u Ceilin El. 624' 1 000.0 2000.0 3000.0 4000.0 N = 1 Time (s) Graph 8
'G.                    CONSUMERS POWER
' ' " '',.C!f>JcoNSUMERS POWER
                    . POUJERIN6 Palisades Nuclear Plant ANAL VSIS CONTINUATION SHEET EA-Sheet GWS-90-002 13     of _19_ _
* POUJERIN6 MIC:Hl6RN'S L*'-' Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-GWS-90-002 Sheet 17 of _ _,_19,..__
Rev# _ _ _o:___ _
Rev# 0 Now that we have a good idea what the temperatures will be at what elevations in the Containment Air Room and stairwell, we can see how many instruments will be affected.
Reference/Comment LOWER LAYER TEMPERATURES 60.0
In the main part of the room, equipment below elevation 601' 4" will be in the cooler part of the room. In the stairway, equipment below elevation 607' will be in the cooler part of the room. The safety related instruments in the Containment Air Room were looked at to see if enough instruments would be available to safely shut down the plant. In looking at the instruments, not only was the instrument elevation looked at but so was the elevation of the process tubing and cable. Table 4 was developed to show the results of this evaluation.
( .)
55.0
    ....:::J
( ])
ca....
(])
: a.         50.0 E                                                      .. . . . ...
Q)
    ~                                                                  ....... ....
45.0 40.0 1 L Air Temp.
1 L Wall Temp.
35.0'--~~~~l--~~~--l~~~~--r.~~~~--'
0.0       1000.0       2000.0             3000.0       4000.0 N= 1 Graph 3   Time (s) .
LA YER HEIGHT 1 u
-E
  .c
  .Q>
(])                                            Ceilin   El. 603'-6"
-: 603' Q) ctS
_J 601'-6" 600' L-~~~~.....__~~~~--~~~~-"-~~~~-'
0.0           1000.0        2000.0            3000.0        4000.0 N= 1           Time (s)
Graph 4
 
' ''* G                 CONSUMERS
                      *POWER
                    /POWERING Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet 14 GWS-90-002 Rev# _ _ _ _
of _ _
o____
19_ _
Reference/Comment Now that we have modeled the main part of the room, we can model the stairwell area.
Again, we input the physical dimensions of the stairway. Figure 4 below shows what the stairway looks like to the computer. Vent 1 represents the opening to the main part of the room. Vent 2 represents the opening to the rest of containment.
Next we input the fire shown in table 2. Even though the fire will be in the main section of the room we will assume it is all contained in the stairway. Again, both the Heat Release Rate and the Area of the fire are input into Hazard I.
The other inputs to Hazard I were the same as the previous model.
The fire is located against a wall at a height of 9.8 feet.
VENT2 I
I I
I I
I I    34'                     .
                          )-------------,,-
I l '/-
20' 6.5' I
I I
I I
I Figure 4 10'                           ~I The results of running this fire model are shown in graphs 5 through 8. As can be seen from these graphs, the layer of hot air, extends down to above elevation 607'.
The lower layer of air in the stairwell is significantly cooler than the upper layer. In addition, the wall temperature (which is where the instruments are mounted is also significantly cooler than the upper layer air temperature).
 
** 't
      '@>)CONSUMERS POWER Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet 15 GWS-90-002 of _ _ 19_
POUIER/N6 Rev#             0 Reference/Comment HEAT RELEASE 3000..-------1--u--.-----------.-----------..-----------.
2000 1000 0
0.0         1000.0           2000.0               3000.0                   4000.0 N=1               Time (s)
Graph 5 UPPER LA YER TEMPERATURES 500 1 U AirTemp.
1 U Wall Temp.
400
()
Q)
:J
        ....... 300
        -~
Cl>
a.
E Cl>   200 I-100                                       ...... .. . .. . . . . . .. . .. .. .. . . ..
0 0.0         1000.0             2000.0                 3000.0                 4000.
N =1             Time (s)
* Graph 6
 
  ; '~)CONSUMERSPOWER Palisades Nuclear Plant              EA-Sheet 16 GWS-90-002 of _ _ 19_
ANALYSIS CONTINUATION SHEET POWERING                                                     Rev#          0-Reference/Comment LOWER LAYER TEMPERATURES
(.)
Cl) 50.0 L..
:::::J
  ~
  ~        45.0                                   .. . . ...
E                                                          ...... .. .. .
Cl)                                                                        .....
I-40.0 1 L Air Temp.
1 L Wall Temp.
35.0 '---------~----~----.....___ _ ____.
0.0 -       1000.0           2000.0           3000.0         4000.0 N =1     Graph 7 Time (s)
LA YER HEIGHT 1 u Ceilin   El. 624' 623'
- E
::-619'-6"
..c 0)
Cl)
~ 616' Q)
  ~
_J612'-6" 609' 1 000.0           2000.0           3000.0         4000.0 N= 1               Time (s)
Graph 8
 
" ' ,.C!f>JcoNSUMERS     POWER Palisades Nuclear Plant                     EA-   GWS-90-002 ANALYSIS CONTINUATION SHEET                    Sheet 17     of _ _,_19,..__
* POUJERIN6 Rev#         0 MIC:Hl6RN'S "'::~ L*'-'
Reference/Comment Now that we have a good idea what the temperatures will be at what elevations in the Containment Air Room and stairwell, we can see how many instruments will be affected.
In the main part of the room, equipment below elevation 601' 4" will be in the cooler part of the room. In the stairway, equipment below elevation 607' will be in the cooler part of the room.
The safety related instruments in the Containment Air Room were looked at to see if enough instruments would be available to safely shut down the plant. In looking at the instruments, not only was the instrument elevation looked at but so was the elevation of the process tubing and cable. Table 4 was developed to show the results of this evaluation.
It should be noted that emergency operating procedure EOP 9.0 informs the operator that during degraded containment conditions, the operator should not rely on any single instr&#xb5;ment indication due to instrument errors. Alternate I additional instrumentation should be used to confirm trending of PCS conditions.
It should be noted that emergency operating procedure EOP 9.0 informs the operator that during degraded containment conditions, the operator should not rely on any single instr&#xb5;ment indication due to instrument errors. Alternate I additional instrumentation should be used to confirm trending of PCS conditions.
The majority of these instruments are environmentally qualified which means they have been tested to survive a LOCA or MSL8. The temperatures seen in the lower layer of air are significantly lower than a LOCA or MSL8. Therefore, instruments located in the lower layer will operate satisfactorily.
The majority of these instruments are environmentally qualified which means they have been tested to survive a LOCA or MSL8. The temperatures seen in the lower layer of air are significantly lower than a LOCA or MSL8. Therefore, instruments located in the lower layer will operate satisfactorily.
As can be seen from the table there are some instruments that have either conduit, process tubing or instruments themselves in the hot layer of air. The following discussion will show that sufficient instruments are available to safely shutdown the plant. Steam Generator Pressure For a right channel cable tray fire, left channel steam generator pressure instruments are available for both steam generators (PT-0751C and PT-0752C).
As can be seen from the table there are some instruments that have either conduit, process tubing or instruments themselves in the hot layer of air. The following discussion will show that sufficient instruments are available to safely shutdown the plant.
For a left channel cable tray fire, PT-0751 O and its cables are located in the hot layer. However, the corresponding instrument for Steam Generator 8 (PT-07520), located 15 feet from PT-0751 O is not affected.
Steam Generator Pressure For a right channel cable tray fire, left channel steam generator pressure instruments are available for both steam generators (PT-0751C and PT-0752C).
Since steam generator pressure would be the same in both steam generators PT-07520 can be used as sufficient indication for steam generator pressure.
For a left channel cable tray fire, PT-0751 O and its cables are located in the hot layer.
Steam Generator Level For a right channel cable tray fire, left channel steam generator level instruments are available for both steam generators (LT-0751 C and L T-0752C).
However, the corresponding instrument for Steam Generator 8 (PT-07520), located 15 feet from PT-0751 O is not affected. Since steam generator pressure would be the same in both steam generators PT-07520 can be used as sufficient indication for steam generator pressure.
Wide range steam generator level is available with LT-0757A and LT-0758A.
Steam Generator Level For a right channel cable tray fire, left channel steam generator level instruments are available for both steam generators (LT-0751 C and LT-0752C). Wide range steam generator level is available with LT-0757A and LT-0758A.
For a left channel cable tray fire,L T-0751 Os cables are located in the hot layer. In addition, wide range steam generator level instruments L T-07578 and L T-07588 have cables that extend into the hot layer in the stairwell area. Reference/Comment 
For a left channel cable tray fire,LT-0751 Os cables are located in the hot layer. In addition, wide range steam generator level instruments LT-07578 and LT-07588 have cables that extend into the hot layer in the stairwell area.
.. ; l'OWERIN6 MICHl6RN'S l'R06RESS Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-GWS-90-002 Sheet 18 of __ 1_9_ Rev# ____ o ___ _ Reference/Comment Table4 lnst./fube Conduit Conduit In Hot Layer? EQuipment ID Description Elevation Elevation Number Route lnst./fube Conduit
 
:::::P.l"-i6'1S*it=::.
;~ ''C>>~~~:RMERS          ~- l'OWERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 18 Rev# _ _ _ _o____
Steam Gen. A Pressure 601*-10* 599*-a* C0731 CV212,214 Yes No :;::::t,t:;i}ii)j:Ai:::
of _ _1_9_
Steam Gen. A Level 601*-10* 599*_3* C0735 CV212,214 Yes No Steam Gen. A Pressure 600*-9* 599'-3" C0737 3CV212,214 No No ::::::i:..r..:P.1.$!1:G:::
MICHl6RN'S l'R06RESS Reference/Comment Table4 lnst./fube             Conduit         Conduit                             In Hot Layer?
Steam Gen. A Level 600*-9* 599'-3" C0741 3CV212,214 No No PT-0752A Steam Gen. B Pressure 601*-10* 599*-a* C0723 CV212 Yes No LT-0752A Steam Gen. B Level 601*-10* 599'-3" C0725 CV212 Yes No PT-0752C Steam Gen. B Pressure 600'-9" 599'-3" C0727 3CV212 No No LT-0752C Steam Gen. B Level 600*-9* 599*-a* C0729 3CV212 No No Steam Gen. A W.R. Level 600'-9*
EQuipment ID                       Description             Elevation           Elevation         Number       Route         lnst./fube   Conduit jffff~jftrrrrmrrmrr1rrrrrrrram1;i~~~r~M:~OOii~tfjttrrmmrmrrmrmrrrmrr
C4083 CV212,214,216 No No Steam Gen. B W.R. Level 600*-9*
:::::P.l"-i6'1S*it=::. Steam Gen. A Pressure             601*-10*             599*-a*         C0731     CV212,214           Yes         No
C4085 CV212,214,216 No No :::::::t:T:-::C.t.itt:::::
:;::::t,t:;i}ii)j:Ai:::   Steam Gen. A Level                 601*-10*             599*_3*         C0735     CV212,214           Yes         No
Steam Gen. A Level 601*-10* 599*.3* C0733 CV212,214 Yes No Steam Gen. B Level 600'-6" 599'-3" C0739 3CV212,214,216 No No Pressurizer Level* 600'-6" 599'-3" C0166 CV212, CV214 No No Pressurizer Wide Range Level 601'-6" 599*-a* FLEX CV212,214 Yes No :::::P.:f:;i}tu:t:Ai:::
:::::P.'t.m~~:Q::: Steam Gen. A Pressure                       600*-9*             599'-3"         C0737     3CV212,214           No         No
Pressurizer Pressure
::::::i:..r..:P.1.$!1:G::: Steam Gen. A   Level               600*-9*             599'-3"         C0741     3CV212,214           No         No PT-0752A           Steam Gen. B   Pressure           601*-10*             599*-a*         C0723       CV212             Yes         No LT-0752A             Steam Gen. B   Level               601*-10*             599'-3"         C0725       CV212             Yes         No PT-0752C             Steam Gen. B   Pressure             600'-9"             599'-3"         C0727       3CV212             No         No LT-0752C           Steam Gen. B   Level               600*-9*             599*-a*         C0729       3CV212             No         No
* 600'-6* 599*.3* C0166 CV212,214 No No Pressurizer Pressure 601 *-s* 599*-a* C0165 CV212,214 Yes No  
:::::tf~l)'itSt.it:::      Steam Gen. A  W.R. Level           600'-9* :::a~~H~:: C4083                     CV212,214,216         No         No
*.*.*. *. *. Pressurizer Pressure 600*-s* 599*.3* C0166 3CV212 No No PT-0104A N. R. Pressurizer Pressure 600*-9* 599*.3* 3C0181 3CV212 No No PT-0105A W. R. Pressurizer Pressure 600*.9* 599*_3* ??? 3CV212 No No PT-07518 LT-07518 PT-07510 LT-07510 PT-07528 LT-07528 PT-07520 LT-07520
::::::Gt.~ii~a:i:::        Steam Gen. B W.R. Level             600*-9* :::~a:.ii!~j:f.~:: C4085              CV212,214,216          No          No
... . ..
:::::::t:T:-::C.t.itt::::: Steam Gen. A Level                 601*-10*             599*.3*         C0733     CV212,214           Yes         No
LT-0703 LT-0704 LT-01018 LT-0103 PT-01018 PT-01028 PT-01020 PT-01048 PT-01058 Steam Gen. A Pressure 599*-2* Steam Gen. A Level 599'-2* Steam Gen. A Pressure 601 '*6* Steam Gen. A Level 599'-3" Steam Gen. 8 Pressure 599'-2" Steam Gen. 8 Level 599'-2" Steam Gen. 8 Pressure 599'-2" Steam Gen. 8 Level 599'-2" Steam Gen. A W.R. Level 599'-2" Steam Gen. 8 W.R. Level 599'-2" Steam Gen. A Level 599'-2" Steam Gen. 8 Level 599'-2" Pressurizer Level* 599'-2" Pressurizer Wide Range Level 599'-2" Pressurizer Pressure*
::::::::f:t.::0-].~::::    Steam Gen. B Level                 600'-6"             599'-3"         C0739   3CV212,214,216         No         No
599'-2" Pressurizer Pressure 599'-2" Pressurizer Pressure 599'-2" N. R. Pressurizer Pressure 599'-2" W. R. Pressurizer Pressure 599'-2" Located in Main Part of Room -I I Located in Stairway -l:;:;:=:::;:::::;::::J 602*-o* 602*-o* 602'-0" 602'-0" 599'-3" 599'-3" 599'-3" 599'-3" 602'-0" 602'-0" 599'-3" 602'-0" 599'-3" 599'-3" 599'-3" 599'-3" 599'-3" C0732 CV21 O,CV222,224 No Yes C0734 CV21 O,CV222,224 No Yes C0740 4CV2-10,222 Yes Yes C0742 4CV210,222 No Yes C0724 CV210,222 No No C0276 CV210,222 No No C0728 4CV210,222, 224 No No C0730 4CV210,222, 224 No No C04082 CV210,222,224,22E No Yes C04084 CV210,222,224,22E No Yes C0736 CV210,222 No Yes C0744 4CV210,222, 224 No Yes C0169 CV210,222 No No C0746 CV210,222,224 No Yes C0169 CV210,222 No No C0169 CV210,222 No No C0172 4CV210,222, 224 No No 3C0180 4CV210,222, 224 No No C1460 4CV210 222 224 No No
::::::t:'t~G~~~~:::        Pressurizer Level*                 600'-6"             599'-3"         C0166   CV212, CV214           No         No
* Non Environmentally Qualified. 
:::::::t:=t:-:C:1"~:::::  Pressurizer Wide Range Level        601'-6"             599*-a*         FLEX       CV212,214           Yes         No
... . : '
:::::P.:f:;i}tu:t:Ai:::   Pressurizer Pressure
POWER Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-GWS-90-002 Sheet 19 of 19 POUIERIN6 MICHl68N'S PR06RESS Rev# ____ o ___ _ Regarding the wide range steam generator level instruments, during normal shutdowns, steam generator levels do not usually go below the narrow range instrumentation.
* 600'-6*             599*.3*         C0166     CV212,214           No         No
Therefore shutdown can be accomplished without wide range steam generator level indication.
:::::P:'t~ijjg:Y(:::      Pressurizer Pressure               601 *-s*           599*-a*         C0165     CV212,214           Yes         No
Regarding L T-0751 D, the corresponding instrument for Steam Generator 8, (LT-07520) located a minimum of 15 feet from L T-0751 D is not affected by the fire. In addition, the operators have other indications as to the adequacy of the Steam Generator function e.g-. PCS temperatures, main steam flows and feedwater flow. Pressurizer Pressure For a right channel cable tray fire, left channel wide range and narrow range pressurizer pressure instruments are available (PT-0104A and PT-0105A).
      *=*=*=P,t~<tt~*:
      *.*.*.  *. ~            *. Pressurizer Pressure               600*-s*             599*.3*         C0166       3CV212             No         No PT-0104A             N. R. Pressurizer Pressure         600*-9*             599*.3*         3C0181       3CV212             No         No PT-0105A             W. R. Pressurizer Pressure         600*.9*             599*_3*           ???       3CV212             No         No
      ~tfttt/ffjfftt~tf9fttttttffj~~S~&#xa5;~~AA~iilij~f:~ti~~t////f//fjI~tftffff/j PT-07518             Steam Gen. A Pressure              599*-2*            602*-o*          C0732  CV21 O,CV222,224        No        Yes LT-07518            Steam Gen. A Level                  599'-2*            602*-o*          C0734  CV21 O,CV222,224        No        Yes PT-07510            Steam Gen. A Pressure              601 '*6*            602'-0"          C0740    4CV2-10,222          Yes        Yes LT-07510            Steam Gen. A Level                  599'-3"            602'-0"          C0742    4CV210,222            No        Yes PT-07528            Steam Gen. 8 Pressure               599'-2"            599'-3"          C0724      CV210,222            No          No LT-07528            Steam Gen. 8 Level                 599'-2"            599'-3"         C0276      CV210,222            No          No PT-07520            Steam Gen. 8 Pressure             599'-2"             599'-3"         C0728 4CV210,222, 224          No          No LT-07520            Steam Gen. 8 Level                599'-2"             599'-3"         C0730 4CV210,222, 224          No          No
::::::~t~i>>~iff:
      ...          . .. Steam Gen.          A W.R. Level           599'-2"         ::::$~:*:$.~:::: C04082 CV210,222,224,22E          No        Yes
:=:=:tt~i>ilsEiB=:= Steam Gen.         8  W.R. Level           599'-2"         ::::~ji'i:S.~:::: C04084 CV210,222,224,22E          No        Yes LT-0703            Steam Gen. A Level                 599'-2"             602'-0"         C0736      CV210,222            No        Yes LT-0704            Steam Gen. 8 Level                 599'-2"             602'-0"         C0744 4CV210,222, 224          No        Yes LT-01018            Pressurizer Level*                  599'-2"             599'-3"         C0169      CV210,222            No          No LT-0103            Pressurizer Wide Range Level        599'-2"             602'-0"         C0746    CV210,222,224          No        Yes PT-01018            Pressurizer Pressure*              599'-2"            599'-3"         C0169      CV210,222            No          No PT-01028            Pressurizer Pressure                599'-2"             599'-3"         C0169      CV210,222            No          No PT-01020            Pressurizer Pressure                599'-2"             599'-3"         C0172 4CV210,222, 224          No          No PT-01048            N. R. Pressurizer Pressure          599'-2"             599'-3"         3C0180 4CV210,222, 224          No          No PT-01058            W. R. Pressurizer Pressure          599'-2"             599'-3"         C1460 4CV210 222 224           No         No Located in Main Part of Room -I                    I Located in Stairway        - l:;:;:=:::;:::::;::::J
* Non Environmentally Qualified.
 
    ~  ...  .
: '  '~)CONSUMERS  POWER Palisades Nuclear Plant EA-        GWS-90-002 ANALYSIS CONTINUATION SHEET                      Sheet    19    of    19 POUIERIN6                                                                  Rev# _ _ _ _o____
MICHl68N'S PR06RESS Reference/Comment Regarding the wide range steam generator level instruments, during normal shutdowns, steam generator levels do not usually go below the narrow range instrumentation. Therefore shutdown can be accomplished without wide range steam generator level indication.
Regarding LT-0751 D, the corresponding instrument for Steam Generator 8, (LT-07520) located a minimum of 15 feet from LT-0751 D is not affected by the fire. In addition, the operators have other indications as to the adequacy of the Steam Generator function e.g-. PCS temperatures, main steam flows and feedwater flow.
Pressurizer Pressure For a right channel cable tray fire, left channel wide range and narrow range pressurizer pressure instruments are available (PT-0104A and PT-0105A).
For a left channel cable tray fire, right channel wide range and narrow range pressurizer pressure instruments are available (PT-01048 and PT-01058).
For a left channel cable tray fire, right channel wide range and narrow range pressurizer pressure instruments are available (PT-01048 and PT-01058).
Pressurizer Level For a right channel cable tray fire, left channel pressurizer level instrument LT-0102 has instrument tubing that extends into the hot layer. There is a possibility that the water in the process tubing will flash to steam since the upper layer temperature is above the saturation temperature at this pressure.
Pressurizer Level For a right channel cable tray fire, left channel pressurizer level instrument LT-0102 has instrument tubing that extends into the hot layer. There is a possibility that the water in the process tubing will flash to steam since the upper layer temperature is above the saturation temperature at this pressure. What is expected to happen is that the heat will be conducted away by the tubing during the short period of time the process tubing is exposed to the hot layer. This is based on several reasons:
What is expected to happen is that the heat will be conducted away by the tubing during the short period of time the process tubing is exposed to the hot layer. This is based on several reasons: 1. Only a short section of the tubing (approximately 2 feet) is in the hot layer. 2. The section of tubing in the hot layer is mounted on the wall, thus its temperature will more closely approximate the wall temperature seen in graph 2. 3. The tubing is only in the hot layer for approximately 1 minute (see graph 4). 4. The upper layer air temperature is only above saturation for a maximum of 200 seconds (graph 2). Even if some flashing would occur, transmitter accuracy would recover after approximately 1 minute when the hot layer rose back up (see graph 4). This provides adequate guidance to the operators to safely shut down. In addition L T-0101 A is available to provide pressurizer level indication should L T-0102 fail. For a left channel cable tray fire, right channel pressurizer level instrument LT-0103 has cables that extend into the hot layer. LT-0101 B is available to provide Pressurizer level indication should L T-0103 fail. This provides adequate information to safely shut down the plant. CONCLUSION This analysis has shown that based on the amount and type of combustibles and type of ignition source, a fire in the Containment Air Room is extremely unlikely.
: 1. Only a short section of the tubing (approximately 2 feet) is in the hot layer.
If a fire were to occur it would be most likely a small self extinguishing fire that generates dense smoke. If a much larger fire were to occur, there will still be enough instruments available to the operators to safely shutdown the plant. Reference/Comment}}
: 2. The section of tubing in the hot layer is mounted on the wall, thus its temperature will more closely approximate the wall temperature seen in graph 2.
: 3. The tubing is only in the hot layer for approximately 1 minute (see graph 4).
: 4. The upper layer air temperature is only above saturation for a maximum of 200 seconds (graph 2).
Even if some flashing would occur, transmitter accuracy would recover after approximately 1 minute when the hot layer rose back up (see graph 4). This provides adequate guidance to the operators to safely shut down.
In addition LT-0101 A is available to provide pressurizer level indication should LT-0102 fail.
For a left channel cable tray fire, right channel pressurizer level instrument LT-0103 has cables that extend into the hot layer. LT-0101 B is available to provide Pressurizer level indication should LT-0103 fail. This provides adequate information to safely shut down the plant.
CONCLUSION This analysis has shown that based on the amount and type of combustibles and type of ignition source, a fire in the Containment Air Room is extremely unlikely. If a fire were to occur it would be most likely a small self extinguishing fire that generates dense smoke. If a much larger fire were to occur, there will still be enough instruments available to the operators to safely shutdown the plant.}}

Latest revision as of 16:15, 23 February 2020

Forwards Addl Info Re Util Request for Exemption from Separation Criteria of 10CFR50,App R,Section III.G.2 Re Containment Air Room
ML18057A372
Person / Time
Site: Palisades Entergy icon.png
Issue date: 08/08/1990
From: Slade G
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9008140008
Download: ML18057A372 (22)


Text

1

. *~t,*~ ....

consumers Power GB Slade General Manager POWERiNii MICHlliAN~S PROliRESS Palisades Nuclear Plant: 27780 Blue Star Memorial Highway, Covert, Ml 49043 August 8, 1990 Nucl.ear Regulatory Commission Document Control Desk Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -

CONTAINMENT AIR ROOM - 10CFR50 APPENDIX R EXEMPTION REQUEST - ADDITIONAL INFORMATION Consumers Power Company (CPC) letter dated October 4, 1985, requested an exemption from the separation criteria of 10CFR50 Appendix R, Section III.G.2 for the pressure and level transmitters in the Containment Air Room.

Subsequently, after discussion with the NRC staff, our January 11, 1989 letter proposed Appendix R compliance for the Containment Air Room using post-fire safe shutdown methodology similar to that methodology which could be used after a Main Steam Line Break (MSLB) inside containment. If used as an Appendix R compliance strategy, this methodology could require exemptions from two other Appendix R criteria (III.G.3 & III.L.2).

After further study, the NRC staff determined that neither the October 4, 1985 nor the January 11, 1989 Exemption Request contained enough substantiation to allow an exemption. CPC then decided to install fixed suppression to bring the area into compliance with Section III.G.2 and committed to install the suppression system during the 1990 Refueling Outage. Because of potential containment sump level problems caused by the suppression system actuating during postulated transients, intricate shutoff controls of the fire water made the installation more expensive than previously estimated. Therefore, after extensive discussion with the NRC staff, it was mutually decided that if CPC would further analyze the effect of a fire using state-of-the-art methods and would still conclude that a credible worst case fire could not prevent post-fire safe shutdown, the staff would re-evaluate CPC's October 4, 1985 exemption request. Also, it was agreed that the planned installation of a fixed suppression system could wait until the exemption request re-evaluation is complete. Thus, if installation is still required, it will be delayed until a shutdown of sufficient length after the 1990 Refueling Outage.

Attachment 1, analysis EA-GWS-90-002, is CPC's state-of-the-art re-analysis of the effect of a Containment Air Room fire. The analysis uses the Hazard I Fire Assessment Method which is approved by the National Institute of Standards and Technology, assumes very conservative amounts of combustibles

Nu~lear Regulatory Commission 2 Palisades Plant 10CFRSO Exemption Req - Add Info Draft and rate of combustion, and concludes that a credible worst case fire in the Containment Air Room would leave sufficient instruments operable to safely shutdown the plant.

In view of the above additional information, CPC again requests that the Containment Air Room be exempted from the separation criteria of 10CFRSO Appendix R,Section III.G.2. This request is made under the provisions of 10CFRS0.12 (a)(2)(ii) in that application of the requirements of Appendix R,Section III.G.2 in these particular circumstances is not necessary to achieve the underlying purpose of the rule.

OS< --\L::s ~

Gerald B Slade General Manager Palisades Nuclear Plant CC: Administrator - Region III NRC resident Inspector - Palisades OC0790-0060-NL04

ATTACHMENT 1 Consumers Power Company Palisades Plant Docket 50-255 ANALYSIS OF THE EFFECT OF A FIRE ON SAFETY RELATED INSTRUMENTS IN THE CONTAINMENT AIR ROOM August 8, 1990 19 Pages OC0790-0060-NL04

- @) .CONSUMERS POWER l'OUIERIN6 MICHl6RN'S l'R06RESS Palisades Nuclear Plant Engineering Analysis Work Sheet EA- GWS-90-002 Sheet __1__ of _ __._19..___

Title Analysis of the effect of a fire on safety related instruments in the Containment Air Room.

INITIATION AND REVIEW Rev Initiated Initiator Review Method Check ( II' ) Technically Reviewed Reviewer Appd Alt Det Qual Appd Date Description ,,,...,.\

By By Cale Rvw Test By Date Bx 0 Original Issue GWSle'eP0r 8/6/90 ~'}V /  ;;,u. )<j. IZ./ /J-7-?CI ~

V' Reference/Comment OBJECTIVE The purpose of this analysis is to show the impact a fire in the Containment Air Room would have on safety related instruments located in that room. This analysis will show that the affect on the instruments will be small enough such that sufficient instruments will be available to safely shut down the plant.

ANALYSIS INPUT

1. Hazard I Rre Assessment Method, Version 1.0 National Institute of Standards and Technology, May 1989.
2. Various plant drawings showing room layout, equipment locations, conduit, cable and tubing routings.
3. SFPE Handbook of Rre Protection Engineering, Copyright 1988, Page 2-14.
4. NUREG/CR-5384, SAND89-1359, A Summary of Nuclear Power Plant Fire Safety Research at Sandia National Laboratories, 1975-1987.
5. EPRI NP-1881, Categorization of Cable Flammability Intermediate-Scale Fire Tests of Cable Tray Installations.
6. Generic Letter86-10, Implementation of Fire Protection Requirements, April 24, 1986
7. Licensing correspondence pertaining to ttie Containment Air Room.
8. Development and Results of a Test Program to Demonstrate Compliance with IEEE Std. 384 and R.G. 1.75 Electrical Separation Requirements, IEEE Power Engineering Review, June 1987.

' cti>>

CONSUMERS POWER POIDERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 2 of _ _

0 19 M IC:Hll:A"'1'~ :O::"'"Af:'C:C:

Rev#

Reference/Comment ASSUMPTIONS

1. A cable tray fire is the only type of fire that needs to be considered for the following reasons:
  • Access to this area is severely limited during operations. Personnel entering containment dress and undress outside of containment. There are no "step-off" pads and no discarded Anti-Cs inside of containment during operation. Everything is stored or discarded outside of containment when the plant is operating.
  • Strict administrative controls dictate that all loose material be removed from containment prior to startup to prevent containment sump plugging and transient fires.

Since controls are in place to remove the risk of transient fires during operation and the only major fixed combustible is cable, a cable tray fire is the only fire that needs to be considered.

2. Fires that occur during plant operations are considered worst case since that is the time the instruments would be needed to safely shut down.
3. A worst case fire involves the cables in one channel of cable trays only. By the use of cable tray fire stops and other protective features and controls, it can be assumed that one train of instrumentation circuits will be free of fire damage for anticipated fires inside containment.

This has been agreed to by the NRC Staff and documented in our exemption request dated 7/23/85.

4. Narrow range (0-100%) Steam Generator level indication is sufficient for safe shutdown.

This is acceptable because a LOCA or MSLB is not considered to be occurring at the same time as a fire.

5. Level indication in one steam generator is sufficient for safe shutdown. Again because a LOCA or MSLB is not occurring simultaneously.

ANALYSIS This analysis for a fire in the Containment Air Room is organized as follows:

1. Description of Room
2. Likelihood of a fire.
3. Type of a fire.
4. Consequences of a fire.
  • @) CONSUMERS POWER POIDERIN6 MICHISRN'~ PRBSRF~~

Palisades Nuclear Plant ANAL VSIS CONTINUATION SHEET EA-Sheet Rev#

GWS-90-002 3 of 0

19 I

Reference/Comment Descrjptjon of Room The room is oddly shaped with a 13 1/2 foot high ceiling. Total volume is approximately 14,420 cubic feet. The walls, floors and ceiling are constructed of poured, reinforced concrete. The Reference 7 northeast corner contains a metal staircase. The stairs go up only. The area is well ventilated.

Air flow is out of the room.

The cable trays in the room are lightly loaded. The majority of the cable trays located near the instruments contain small gauge instrumentation cables.

Table 1 has a listing of the cable trays in this room along with their loading obtained from the circuit and raceway schedule.

Figure 1 shows a 3-D perspective of the room with approximate locations of the raceways. The flow of air in the room is from the louver at the 590' elevation up the stairwell and through the door on the 607' elevation.

Figure 2 with views A through F is a plan view of the room with the approximate locations of the various instrumerits in this room. Table 1 RACEWAY CABLE SIZE Cinches) LENGTH %Fill CABLE VOL IME CcufO GAUGE HEIGHT WIDTH (Feet) Ria ht Left CP226 (R) AWG14 4.00 6.00 25.00 18.10% 0.75 CV226 (R) AWG16 4.00 6.00 25.00 6.10% 0.25 CP216 (L) AWG12-14 4.00 6.00 40.00 11.90% 0.79 CV216 (L) AWG16 4.00 6.00 40.00 11.10% 0.74 CV224 (R) AWG16 4.00 6.00 25.00 10.30% 0.43 CP224 (R) AWG12-14 4.00 6.00 25.00 17.10% 0.71 4CP224 (R) AWG14 4.00 6.00 22.00 2.30% 0.08 4CV224 (R) AWG16 4.00 6.00 22.00 3.70% 0.14 CP214 (L) AWG12-14 4.00 6.00 20.00 11.90% 0.40 CV214 (L) AWG14-16 4.00 6.00 20.00 18.50% 0.62 CP212 (L) AWG12-14 4.00 6.00 20.00 11.90% 0.40 CV212 (L) AWG14-16 4.00 6.00 20.00 22.10% 0.74 CP222 (R) AWG12-14 4.00 6.00 20.00 17.10% 0.57 CV222 (R) AWG16 4.00 6.00 20.00 16.00% 0.53 4CP222 (R) AWG14 4.00 6.00 16.00 2.30% 0.06 4CV222 (R) AWG16 4.00 6.00 16.00 9.20% 0.25 3CP212 (L) AWG12-14 4.00 6.00 14.00 1.20% 0.03 3CV212 (L) AWG14 4.00 6.00 14.00 14.40% 0.34 CP202 AWG2-14 4.00 12.00 25.00 18.20% 1.52 1.52 CP204 AWG2-14 4.00 12.00 23.00 16.70% 1.28 1.28 4CV180 (R) AWG16 4.00 6.00 10.00 0.50% 0.01 CV180 (R) AWG16 4.00 6.00 6.00 5.90% 0.06 CV170 (R) AWG16 4.00 12.00 12.00 3.00% 0.12 4CP210 (R) AWG14 4.00 6.00 6.00 1.70% 0.02 4CV210 (R) AWG16 4.00 6.00 6.00 9.30% 0.09 CP210 (R) AWG1/0-14 4.00 16.00 5.00 25.00% 0.56 CV210 (R) AWG16 4.00 16.00 5.00 8.60% 0.19 3CP214 (L) AWG14 4.00 6.00 17.00 1.20% 0.03 3CV214 (L) AWG16 4.00 6.00 17.00 13.10% 0.37 Total volume 1n cub1c feet= 7.62 7.25

@>> CONSUMERS POWER

  • POIDERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 4 of _1_9_ _

Rev# _ _ _~o'---~

Reference/Comment PALISADES NUCLEAR PLANT CONTAINMENT AIR ROOM Reference 4 CABLE TRAYS OPENING TO THE REST OF CONTAIN MEN 603'-6" CP212

.:...w~~~1--11--~- QY.....---...

c CV2~2 590' AIR INTAKE TO ROOM Figure 1

  • o CONSUMERS POWER
  • . POUIERIN6
  • Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 5 of _...:....:19=----

Rev # _ _ _....:;.o_ __

'f::2_

Reference/Comment PALISADES NUCLEAR PLANT CONTAINMENT AIR ROOM Ill(

. . . . ._1*-*=-6' II 19*-o*

Reference 4 43'-

Transformer MCC No. 15 No. 15 Transformer MCC No. 16 No. 16

,* : *...... ; . '1 *-...... ; ..,

~------------- 42'-0" -----------------~;:;.-!

Figure 2

'G CONSUMERS POWER

- - l'OUJERIN6 I

Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet 6 GWS-90-002 Rev #~~~~O=--~~-

of __:.1.=...

9- -

Reference/Comment EL. 604' Figure 2 (Contd)

~~ PT\ 7751C LT-~2 8 LT-0~

8 8 '8 8 ~LT-0751 C LTlo2 EL. 601' PT- 101A PT-~52A PT-~752C PTi7528 r i T -7520 Reference 4 LT--07,A ~ LT--OJ52C * ~~t7~B <'~520 8 8 8 8 . I . ~

PT-0704 PT-~

~FT-0704

~FT--0700 EL. 590'

© PT-0751 ~ .,.,.

PT~lil ~-~048 LT-0700 LT075~ ~LT-0100 1

7510 LT-0704~ ~

EL. 600

  • ELEVATED EL. 600'

--E- PLATFORM ----:3-- ~--~-~---

/ 8~

PT-0105A PT-01058 EL. 590' EL. 590'

~--------

II Right channel D

Left Channel

({>)CONSUMERS POWER Palisades Nuclear Plant EA-Sheet GWS-90-002 7 of _ _.1....

9__

ANALYSIS CONTINUATION SHEET

, l'OIDERIN6 Rev# _ _ _ _o____

MIC:Hll:RAI'~ ~=~

Reference/Comment Figure 2 (Contd) 8 I 8 I .:: .. ~

~

. .... - EL. 603' 6" Reference 4 I

I ~

- -=- I I

IL. 599' 7" EL. 598' 5" CABLE TRAYS ~

8 8 8 8 I II I 8 8 8 I I 8 I 8 8 I I 8 8 aa EL. 590' F

Table 2 shows the approximate horizontal distances between right and left channel transmitters in feet. The following observations can be made from this information:

1. Redundant steam generator pressure transmitters are.27 ft apart (PT-0751A/PT-0752D).
2. Redundant narrow range steam generator level transmitters are 16 ft apart for SG-A, (LT-0751A/LT-0751 D) and 7 ft apart for SG-8 (LT-0752A/LT-0752D).
3. Redundant wide range steam generator level transmitters are within one ft of each other.

This does not prevent safe shutdown since the operator can modulate the Auxiliary Feedwater flow and keep the SG level within the narrow range. The wide range level transmitters are a minimum of 9 ft from their redundant narrow range instruments (LT-0757A/LT-0751 D, LT-0758A/LT-0752D, LT-07578/LT-0751A, LT-07588/LT-0752C).

4. Wide range pressurizer level transmitters are 1Oft apart (LT-0102/LT-0103).
5. Although redundant wide range pressurizer pressure transmitters (PT-0105A/PT-01058) are located adjacent to each other, they are separated from redundant narrow range pressure transmitters by 12 ft (PT-0105A/PT-01018) and 12 ft (PT-01058/PT-0101A). If both wide range pressurizer pressure transmitters were rendered inoperable, one of the narrow range pressure transmitters could be calibrated over the wide range before the approach to cold shutdown is made.

Since cable trays are the only combustible in the room, and assuming one train of cables is the source of the fire, , the relative position of right and left channel redundant instruments to each other is not as important as their position relative to the hot gases which could be generated if one train of cables burned.

.G, CONSUMERS POWER POIUERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 8

Rev# _ _ _ _o of _1_9__

Reference/Comment Right Channel Instruments Steam generator Pressure Pressurizer Level Table 2 Q)

(I)

....I

..... LT-0752A 10 9 0

iii (I) LT-0752C 10 9 c:

(I)

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LT-0757A 9 10 25 27 .5 E LT-0758A 6 7 23 25 Cl!

(I)

LT-0701 14 15 25 27 Ci5 LT-0702 en c ~

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LikelibQQd Qf 8 Ei(e One aspect of this issue is the likelihood of a fire. During plant operation external sources of ignition are extremely unlikely. This leaves the possibility of a self initiated cable tray fire.

As a result of fire research it has been found that for #12 AWG cables currents of from 120 to Reference 4 130 amperes were required to induce open flaming. In full-scale testing, the intense period of fire activity persisted for between 40 and 240 seconds after which rapid reduction to self-extinguishment of the fire was observed. In no case involving electrically initiated fires in rated low flame spread cables was propagation of the fire beyond the tray of fire origin observed.

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' 'fp)coNSUMERS POWER Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-GWS-90-002 9 _ of --'1~9_

Sheet _ _

- POUIERIN6 MICHll:llAI'~ PRacar:rr Rev# O Reference/Comment In other tests conducted, locked rotor amperes (LRA) were applied to test cables to judge their impact on target cables. One of the design criteria for the test program was that the worst-case Reference 8 electrically induced fault would be on a motor feeder circuit, because the majority of large loads, and the more potentially damaging ones, are motor loads. The most credible worst-case fault would be the sustained application of locked rotor amperes (LRA) to the test cables. This type of fault was selected because it is a typical condition, it can be postulated as having an extended duration, and its magnitude is large enough to cause damage to the fault cable and adjacent cables. To select the test cable, typical plant cable feeder sizes were tabulated along with the corresponding maximum LRA for each feeder, and the corresponding motor pigtail conductor size. Based on preliminary screening test data, a relationship was developed between LRA durations and fusing (open circuit) of the motor pigtail conductors. Using this relationship in conjunction with data obtained from the screening tests, the worst-case fault cable was selected, and was used in the subsequent configuration tests. The selected worst-case cable was the cable with the highest temperature at the time its corresponding motor pigtails fused (open circuited).

The tests demonstrated that when ignition occurred, the fire never propagated to an adjacent target cable even when both were touching. The fires that occurred were self-extinguishing when the electrical fault was interrupted. The amount of smoke created by the overload was extremely dense and would be readily detected by the plant fire detection systems.

The majority of the cable trays in the vicinity of the instruments contain only instrumentation cable which is fused to prevent the high currents necessary to ignite the cable. Should the fusing still allow high currents it is unlikely that surrounding cables or cable trays would be affected. Also the smoke generated would activate the detectors very early into a problem.

Type Of A Eire From the previous section it can be seen that the most likely type of fire would be a small self-extinguishing fire that would generate a lot of smoke.

For the purposes of analysis, we will assume a much worse fire the type of which would be most likely initiated by an external source.

The type of fire was determined using an equation developed by B.T. Lee in a study conducted in 1985. This research indicates that the peak full scale heat release rate(q) can be Reference 3 predicted according to bench scale heat release measurements 'fs

'rs = 0.45

  • qbs
  • A where the bench scale heat release value (qb~) is the peak measured under irradiance conditions of 60 kW/sq m, and A is the exposed tray area actively pyrolyzing. The active pyrolysis area, in turn, is estimated based on the type of cable and its bench scale heat release rate which can be obtained from Figure 2-1 .18 of the SEPE Handbook of Eire Protection Engineering, which gives dA/dt as a function of a".

A 'bs dA Thus, at any given time t, .

A(t) = o + cit

  • t Using a conservative number 400kW/sq m for the bench scale heat release rate (322 is the mean for the ones listed) and 1.0sq rn/min. rate of flame coverage (obtained from Ref. 3 Figure 2-1.18). The fire shown in Table 3 was generated:
  • o CONSUMERS POWER

. POUIERIN6 Palisades Nuclear Plant ANALVSIS CONTINUATION SHEET EA-Sheet GWS-90-002 1O Rev# _ _ _ _

of __1_9__

o____

Reference/Comment Table3 0.00 0.00 0.0000 0.0000 30.00 0.25 1.5000 3.8333 64.10 60.00 0.63 3.8066 9.2155 154.10 90.00 1.02 6.1133 14.5976 244.10 120.00 1.40 8.4199 19.9797 334.10 150.00 1.79 10.7265 25.3619 424.10 180.00 2.17 13.0331 30.7440 514.10 210.00 2.56 15.3398 36.1261 604.10 240.00 2.94 17.6464 41.5082 694.10 270.00 3.33 19.9530 46.8904 784.10 300.00 3.71 22.2597 52.2725 874.10 330.00 4.09 24.5663 57.6546 964.10 360.00 4.48 26.8729 63.0368 1,054.10 390.00 4.86 29.1795 68.4189 1,144.10 420.00 5.25 31.4862 73.8010 1,234.10 450.00 5.63 33.7928 79.1832 l,324.10 480.00 6.02 36.0994 84.5653 1,414.10 510.00 6.40 38.4060 89.9474 1,504.10 540.00 6.79 40.7127 95.3296 1,594.10 600.00 7.55 45.3259 106.0938 1,774.10 630.00 7.94 47.6326 111.4760 1,864.10 660.00 8.32 49.9392 116.8581 1,954.10 780.00 9.86 59.1657 138.3866 2,314.10 900.00 11.40 68.3922 159.9151 2,674.10 1,080.00 0.00 0.0000 0.0000 0.00 This represents over 68 feet of 12 " wide cable tray with 50% fill involved in a fire. The volume at the end of the fire exceeds the total volume of either right or left channel cable trays in the Containment Air Room. This is considered a worst case fire. A slower burning fire is more likely however a slower fire would not produce as high a temperature as a faster fire.

Conseguences of a Fjre Now that we have looked at the room configuration and at what we consider is a worst case fire, we can try to assess the impact this fire will have on instruments the operators need to safely shut down the plant.

What we expect will happen is that hot air from the fire will travel along the ceiling and go up the stairway without having a negative impact on necessary instruments. To verify this we will use fire modeling program called Hazard I developed by the National Institute of Standards and Technology.

~ . '

' . ~)CONSUMERS POWER Palisades Nuclear Plant EA*

GWS-90-002 ANALYSIS CONTINUATION SHEET Sheet 11 of _ _1~9-POWERING Rev # _ _ _ _ o____

Reference/Comment The first step in using Hazard I to validate our theory of what happens for a fire in the Containment Air Room is to input the necessary parameters into the program.

We will do this in two parts. First we will look at the main part of the Containment Air Room, then we will look at the stairway. Each area will be modeled separately.

The first parameter we input is the physical dimensions of the main part of the room. Figure 3 below shows what this room looks like to the computer. Vent 1 represents the stairway going up.

- Next we input the fire shown in table 2. Both the Heat Release Rate and the Area of the fire are input into Hazard I.

Figure 3 The fire is located in the center of the room at a height of 9.8 feet.

13' -6" The ceiling floors and walls are all 6" thick concrete.

Ambient conditions:

Internal= 100 degrees F External = 120 degrees F

'* c:fJ CONSUMERS POWER POWERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet _ 1_

Rev#

GWS-90-002 2_ of _ _

O 19_ _

Reference/Comment The results of running this fire model are shown in graphs 1 through 4. As can be seen from these graphs, there is a layer of extremely hot air near the ceiling, that .extends down two feet during the worst part of the fire.

  • The lower layer of air in the room is significantly cooler than the upper layer. In addition, the wall temperature (which is where most of the instruments are mounted is also significantly cooler than the upper layer air temperature.

HEAT RELEASE

~

~

2000 Q)

(/J ca Q)

Q) a: 1000

+-'

ro Q)

I 0

0. 1000.0 2000.0 3000.0 400 .0 0 *N = 1 Graph 1 Time (s)

UPPER LA YER TEMPERATURES 400 U Air Temp.

1 U Wall Temp. .. .,

0.......... 300

(].)

i....

J co i....

Q) 200 a.

E Q)

I-100 ... . . . .. .. . . . .

0 0.0 1000.0 2000.0 3000.0 4000 0 N =1 Graph 2 Time (s)

e e

'G. CONSUMERS POWER

. POUJERIN6 Palisades Nuclear Plant ANAL VSIS CONTINUATION SHEET EA-Sheet GWS-90-002 13 of _19_ _

Rev# _ _ _o:___ _

Reference/Comment LOWER LAYER TEMPERATURES 60.0

( .)

55.0

....:::J

( ])

ca....

(])

a. 50.0 E .. . . . ...

Q)

~ ....... ....

45.0 40.0 1 L Air Temp.

1 L Wall Temp.

35.0'--~~~~l--~~~--l~~~~--r.~~~~--'

0.0 1000.0 2000.0 3000.0 4000.0 N= 1 Graph 3 Time (s) .

LA YER HEIGHT 1 u

-E

.c

.Q>

(]) Ceilin El. 603'-6"

-: 603' Q) ctS

_J 601'-6" 600' L-~~~~.....__~~~~--~~~~-"-~~~~-'

0.0 1000.0 2000.0 3000.0 4000.0 N= 1 Time (s)

Graph 4

' * G CONSUMERS

  • POWER

/POWERING Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet 14 GWS-90-002 Rev# _ _ _ _

of _ _

o____

19_ _

Reference/Comment Now that we have modeled the main part of the room, we can model the stairwell area.

Again, we input the physical dimensions of the stairway. Figure 4 below shows what the stairway looks like to the computer. Vent 1 represents the opening to the main part of the room. Vent 2 represents the opening to the rest of containment.

Next we input the fire shown in table 2. Even though the fire will be in the main section of the room we will assume it is all contained in the stairway. Again, both the Heat Release Rate and the Area of the fire are input into Hazard I.

The other inputs to Hazard I were the same as the previous model.

The fire is located against a wall at a height of 9.8 feet.

VENT2 I

I I

I I

I I 34' .

)-------------,,-

I l '/-

20' 6.5' I

I I

I I

I Figure 4 10' ~I The results of running this fire model are shown in graphs 5 through 8. As can be seen from these graphs, the layer of hot air, extends down to above elevation 607'.

The lower layer of air in the stairwell is significantly cooler than the upper layer. In addition, the wall temperature (which is where the instruments are mounted is also significantly cooler than the upper layer air temperature).

    • 't

'@>)CONSUMERS POWER Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet 15 GWS-90-002 of _ _ 19_

POUIER/N6 Rev# 0 Reference/Comment HEAT RELEASE 3000..-------1--u--.-----------.-----------..-----------.

2000 1000 0

0.0 1000.0 2000.0 3000.0 4000.0 N=1 Time (s)

Graph 5 UPPER LA YER TEMPERATURES 500 1 U AirTemp.

1 U Wall Temp.

400

()

Q)

J

....... 300

-~

Cl>

a.

E Cl> 200 I-100 ...... .. . .. . . . . . .. . .. .. .. . . ..

0 0.0 1000.0 2000.0 3000.0 4000.

N =1 Time (s)

  • Graph 6
'~)CONSUMERSPOWER Palisades Nuclear Plant EA-Sheet 16 GWS-90-002 of _ _ 19_

ANALYSIS CONTINUATION SHEET POWERING Rev# 0-Reference/Comment LOWER LAYER TEMPERATURES

(.)

Cl) 50.0 L..

J

~

~ 45.0 .. . . ...

E ...... .. .. .

Cl) .....

I-40.0 1 L Air Temp.

1 L Wall Temp.

35.0 '---------~----~----.....___ _ ____.

0.0 - 1000.0 2000.0 3000.0 4000.0 N =1 Graph 7 Time (s)

LA YER HEIGHT 1 u Ceilin El. 624' 623'

- E

-619'-6"

..c 0)

Cl)

~ 616' Q)

~

_J612'-6" 609' 1 000.0 2000.0 3000.0 4000.0 N= 1 Time (s)

Graph 8

" ' ,.C!f>JcoNSUMERS POWER Palisades Nuclear Plant EA- GWS-90-002 ANALYSIS CONTINUATION SHEET Sheet 17 of _ _,_19,..__

  • POUJERIN6 Rev# 0 MIC:Hl6RN'S "'::~ L*'-'

Reference/Comment Now that we have a good idea what the temperatures will be at what elevations in the Containment Air Room and stairwell, we can see how many instruments will be affected.

In the main part of the room, equipment below elevation 601' 4" will be in the cooler part of the room. In the stairway, equipment below elevation 607' will be in the cooler part of the room.

The safety related instruments in the Containment Air Room were looked at to see if enough instruments would be available to safely shut down the plant. In looking at the instruments, not only was the instrument elevation looked at but so was the elevation of the process tubing and cable. Table 4 was developed to show the results of this evaluation.

It should be noted that emergency operating procedure EOP 9.0 informs the operator that during degraded containment conditions, the operator should not rely on any single instrµment indication due to instrument errors. Alternate I additional instrumentation should be used to confirm trending of PCS conditions.

The majority of these instruments are environmentally qualified which means they have been tested to survive a LOCA or MSL8. The temperatures seen in the lower layer of air are significantly lower than a LOCA or MSL8. Therefore, instruments located in the lower layer will operate satisfactorily.

As can be seen from the table there are some instruments that have either conduit, process tubing or instruments themselves in the hot layer of air. The following discussion will show that sufficient instruments are available to safely shutdown the plant.

Steam Generator Pressure For a right channel cable tray fire, left channel steam generator pressure instruments are available for both steam generators (PT-0751C and PT-0752C).

For a left channel cable tray fire, PT-0751 O and its cables are located in the hot layer.

However, the corresponding instrument for Steam Generator 8 (PT-07520), located 15 feet from PT-0751 O is not affected. Since steam generator pressure would be the same in both steam generators PT-07520 can be used as sufficient indication for steam generator pressure.

Steam Generator Level For a right channel cable tray fire, left channel steam generator level instruments are available for both steam generators (LT-0751 C and LT-0752C). Wide range steam generator level is available with LT-0757A and LT-0758A.

For a left channel cable tray fire,LT-0751 Os cables are located in the hot layer. In addition, wide range steam generator level instruments LT-07578 and LT-07588 have cables that extend into the hot layer in the stairwell area.

~ C>>~~~:RMERS ~- l'OWERIN6 Palisades Nuclear Plant ANALYSIS CONTINUATION SHEET EA-Sheet GWS-90-002 18 Rev# _ _ _ _o____

of _ _1_9_

MICHl6RN'S l'R06RESS Reference/Comment Table4 lnst./fube Conduit Conduit In Hot Layer?

EQuipment ID Description Elevation Elevation Number Route lnst./fube Conduit jffff~jftrrrrmrrmrr1rrrrrrrram1;i~~~r~M:~OOii~tfjttrrmmrmrrmrmrrrmrr

P.l"-i6'1S*it=::. Steam Gen. A Pressure 601*-10* 599*-a* C0731 CV212,214 Yes No
t,t
;i}ii)j:Ai::: Steam Gen. A Level 601*-10* 599*_3* C0735 CV212,214 Yes No
P.'t.m~~:Q::: Steam Gen. A Pressure 600*-9* 599'-3" C0737 3CV212,214 No No
i:..r..:P.1.$!1:G::: Steam Gen. A Level 600*-9* 599'-3" C0741 3CV212,214 No No PT-0752A Steam Gen. B Pressure 601*-10* 599*-a* C0723 CV212 Yes No LT-0752A Steam Gen. B Level 601*-10* 599'-3" C0725 CV212 Yes No PT-0752C Steam Gen. B Pressure 600'-9" 599'-3" C0727 3CV212 No No LT-0752C Steam Gen. B Level 600*-9* 599*-a* C0729 3CV212 No No
tf~l)'itSt.it::: Steam Gen. A W.R. Level 600'-9* :::a~~H~:: C4083 CV212,214,216 No No
Gt.~ii~a:i::: Steam Gen. B W.R. Level 600*-9* :::~a:.ii!~j:f.~:: C4085 CV212,214,216 No No
t:T:-::C.t.itt::::: Steam Gen. A Level 601*-10* 599*.3* C0733 CV212,214 Yes No
f:t.::0-].~:::: Steam Gen. B Level 600'-6" 599'-3" C0739 3CV212,214,216 No No
t:'t~G~~~~::: Pressurizer Level* 600'-6" 599'-3" C0166 CV212, CV214 No No
t:=t:-:C:1"~::::: Pressurizer Wide Range Level 601'-6" 599*-a* FLEX CV212,214 Yes No
P.:f:;i}tu:t:Ai::: Pressurizer Pressure
  • 600'-6* 599*.3* C0166 CV212,214 No No
P:'t~ijjg:Y(::: Pressurizer Pressure 601 *-s* 599*-a* C0165 CV212,214 Yes No
  • =*=*=P,t~<tt~*:
  • .*.*. *. ~ *. Pressurizer Pressure 600*-s* 599*.3* C0166 3CV212 No No PT-0104A N. R. Pressurizer Pressure 600*-9* 599*.3* 3C0181 3CV212 No No PT-0105A W. R. Pressurizer Pressure 600*.9* 599*_3*  ??? 3CV212 No No

~tfttt/ffjfftt~tf9fttttttffj~~S~¥~~AA~iilij~f:~ti~~t////f//fjI~tftffff/j PT-07518 Steam Gen. A Pressure 599*-2* 602*-o* C0732 CV21 O,CV222,224 No Yes LT-07518 Steam Gen. A Level 599'-2* 602*-o* C0734 CV21 O,CV222,224 No Yes PT-07510 Steam Gen. A Pressure 601 '*6* 602'-0" C0740 4CV2-10,222 Yes Yes LT-07510 Steam Gen. A Level 599'-3" 602'-0" C0742 4CV210,222 No Yes PT-07528 Steam Gen. 8 Pressure 599'-2" 599'-3" C0724 CV210,222 No No LT-07528 Steam Gen. 8 Level 599'-2" 599'-3" C0276 CV210,222 No No PT-07520 Steam Gen. 8 Pressure 599'-2" 599'-3" C0728 4CV210,222, 224 No No LT-07520 Steam Gen. 8 Level 599'-2" 599'-3" C0730 4CV210,222, 224 No No

~t~i>>~iff:

... . .. Steam Gen. A W.R. Level 599'-2"  ::::$~:*:$.~:::: C04082 CV210,222,224,22E No Yes

=:=:tt~i>ilsEiB=:= Steam Gen. 8 W.R. Level 599'-2"  ::::~ji'i:S.~:::: C04084 CV210,222,224,22E No Yes LT-0703 Steam Gen. A Level 599'-2" 602'-0" C0736 CV210,222 No Yes LT-0704 Steam Gen. 8 Level 599'-2" 602'-0" C0744 4CV210,222, 224 No Yes LT-01018 Pressurizer Level* 599'-2" 599'-3" C0169 CV210,222 No No LT-0103 Pressurizer Wide Range Level 599'-2" 602'-0" C0746 CV210,222,224 No Yes PT-01018 Pressurizer Pressure* 599'-2" 599'-3" C0169 CV210,222 No No PT-01028 Pressurizer Pressure 599'-2" 599'-3" C0169 CV210,222 No No PT-01020 Pressurizer Pressure 599'-2" 599'-3" C0172 4CV210,222, 224 No No PT-01048 N. R. Pressurizer Pressure 599'-2" 599'-3" 3C0180 4CV210,222, 224 No No PT-01058 W. R. Pressurizer Pressure 599'-2" 599'-3" C1460 4CV210 222 224 No No Located in Main Part of Room -I I Located in Stairway - l:;:;:=:::;:::::;::::J
  • Non Environmentally Qualified.

~ ... .

' '~)CONSUMERS POWER Palisades Nuclear Plant EA- GWS-90-002 ANALYSIS CONTINUATION SHEET Sheet 19 of 19 POUIERIN6 Rev# _ _ _ _o____

MICHl68N'S PR06RESS Reference/Comment Regarding the wide range steam generator level instruments, during normal shutdowns, steam generator levels do not usually go below the narrow range instrumentation. Therefore shutdown can be accomplished without wide range steam generator level indication.

Regarding LT-0751 D, the corresponding instrument for Steam Generator 8, (LT-07520) located a minimum of 15 feet from LT-0751 D is not affected by the fire. In addition, the operators have other indications as to the adequacy of the Steam Generator function e.g-. PCS temperatures, main steam flows and feedwater flow.

Pressurizer Pressure For a right channel cable tray fire, left channel wide range and narrow range pressurizer pressure instruments are available (PT-0104A and PT-0105A).

For a left channel cable tray fire, right channel wide range and narrow range pressurizer pressure instruments are available (PT-01048 and PT-01058).

Pressurizer Level For a right channel cable tray fire, left channel pressurizer level instrument LT-0102 has instrument tubing that extends into the hot layer. There is a possibility that the water in the process tubing will flash to steam since the upper layer temperature is above the saturation temperature at this pressure. What is expected to happen is that the heat will be conducted away by the tubing during the short period of time the process tubing is exposed to the hot layer. This is based on several reasons:

1. Only a short section of the tubing (approximately 2 feet) is in the hot layer.
2. The section of tubing in the hot layer is mounted on the wall, thus its temperature will more closely approximate the wall temperature seen in graph 2.
3. The tubing is only in the hot layer for approximately 1 minute (see graph 4).
4. The upper layer air temperature is only above saturation for a maximum of 200 seconds (graph 2).

Even if some flashing would occur, transmitter accuracy would recover after approximately 1 minute when the hot layer rose back up (see graph 4). This provides adequate guidance to the operators to safely shut down.

In addition LT-0101 A is available to provide pressurizer level indication should LT-0102 fail.

For a left channel cable tray fire, right channel pressurizer level instrument LT-0103 has cables that extend into the hot layer. LT-0101 B is available to provide Pressurizer level indication should LT-0103 fail. This provides adequate information to safely shut down the plant.

CONCLUSION This analysis has shown that based on the amount and type of combustibles and type of ignition source, a fire in the Containment Air Room is extremely unlikely. If a fire were to occur it would be most likely a small self extinguishing fire that generates dense smoke. If a much larger fire were to occur, there will still be enough instruments available to the operators to safely shutdown the plant.