ML20137Z448
| ML20137Z448 | |
| Person / Time | |
|---|---|
| Site: | 07002948 |
| Issue date: | 11/18/1985 |
| From: | Wetterhahn M CONNER & WETTERHAHN, NIAGARA MOHAWK POWER CORP. |
| To: | Jennifer Davis NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 26087, NUDOCS 8512110303 | |
| Download: ML20137Z448 (12) | |
Text
r-70- f/SO i
LAW OFFICES CONNER & WETTERH AHN, P.C.
17 4 7 P E N N S Y LVA NI A AV E N U E N. W.
TROY H. COMM EN. J H.
WASilING TON D, C. 20000
=.t==^ " "
RETURN IO. 396-SS NL DOUOLAs K. OLSON J..E h!CA H. LAVEHTY
" 8 "_ * ' c "o '"
November 18, 1985 HODENT H. PUML (2021833-3500 L Z HNHAND O. HECIIHOEFEH CABLE ADDRESS: ATOM L AW
/0 A
/
^
RECENED. 1 Mr. John G. Davis E3 00V261985 P re Director, Office of
- s.nutLUR KW co%,#
Nuclear Material Safety g
and Safeguards gg U.S. Nuclear Regulatory Commission
\\y 0
Washington, D.C.
20555 In the Matter of Niagara Mohawk Power Corporation (Nile Mile Point 2)
Docket No. 70-2948
Dear Mr. Davis:
On behalf of Niagara Mohawk Power Corporation, I am enclosing for filing the original and ten copies of an amendment to the Application to Amend Special Nuclear Material License SNM 1898, originally submitted to you on June 12, 1985.
The amendment consists of a replacement page 6 to substitute for the page submitted to you on September 27, 1985.
Sincerely, Mark J. Wetterhahn Counsel for Niagara Mohawk Power Corporation 7
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MJW:sdd O
N Enclosure 0001'N 6
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T NOV 2 61985
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ass uutstcm1 c,
,4 gyctgg
.14 c
s.yf' 9
N.Q os
)[j,f'/7 estatiosoa esille PDR ADOCK 07002948 C
moderator dens' condition rather than show cc
'iance to k-eff = 0.98 under'all cond n.ons.
These recommendations.we.. first presented to the
' utilities via SIL-152 issued in March 1976.
NMPC has followed SIL-152 to eliminate sources of moderation from the imediate area of the new fuel. vault.
In addition, NMP2 has metallic noncombustible covers over the new fuel vault.
These covers allow access to a group of fuel. bundles which, if sprayed with an optimum density moderator, could not exceed k-eff = 0.98 due to the small critical array size. These covers are not required to be water tight at the connections
-since water " sheeting" does not constitute an optimum moderator condition.
In summary, the intent of the procedural controls are to eliminate sources of moderation around the new fuel vault in order to preclude the possibility of achieving-a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers provide a means to preclude exceeding k-eff = 0.98 with optimum moderation by limiting the individual array sizes. Realistic three dimensional Monte Carlo analysis accounting for neutron leakage have shown that L-eff remains below 0.98.
The following firefighting systems shall be functional.
1.
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a minimum of 1000 gpm at 125 psig or the.
permanent fire pump.
3.
The
. sprinkler systems in the railroad passageway.
l 4.
Hose reels in the reactor building.
5.
Fire detector zones 242NW and 281NZ, or a fire watch.
Spent Fuel Storage Facility The design bases of tne spent fuel storage facility are the following:
The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand design seismic loads The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1).
The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91%
moderator dens' condition rather than show cc
'iance to k-eff = 0'.98 under all condi..ons. These recommendations we.. first presented to the utilities via SIL-152 issued in March 1976.
NMPC has followed SIL-152 to eliminate sources of moderation from the immediate area of the new fuel vault.
In addition, NMP2 has metallic noncombustible covers over the new fuel vault. These covers allow access to a group of fuel bundles which, if sprayed with an optimum density I
moderator, could not exceed k-eff = 0.98 due to the small critical array size. These covers are not required to be water tight at the connections since water " sheeting" does not constitute an optimum moderator condition.
In sununary, the intent of the procedural controls are to eliminate sources of moderation around the new fuel vault in order to preclude the
- possibility of achieving a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers provide a means to preclude exceeding k-eff = 0.98 with optimum moderation by-limiting the individual array sizes.
Realistic three dimensional Monte Carlo analysis accounting for neutron leakage have shown that k-eff remains below 0.98.
The following firefighting systems shall be functional.
1.
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a minimum of 1000 gpm at 125 psig or the-permanent fire pump.
3.
The
. sprinkler systems in the railroad passageway.
l-4.
Hose reels -fn the reactor building.
5.
Fire detector zones 242NW and 281NZ, or a fire watch.
Spent Fuel Storage Facility The design bases of the spent fuel storage facility are the following:
The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to' withstand design seismic loads i
The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1). The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent l.
fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 i
The finished product 810 areal density is 0.028 gm/sq. cm.
i Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91%.
--e
,-w--
+ -
-,.+-_,._,..-,,,_,.._,,,,7m.
.,y_,
moderator dens' condition rather than show cc
' lance to k-eff = 0.98 under all cond)..ons.
These recomendations we. _ first presented to the utilities via SIL-152 issued in March 1976.
. NMPC has followed SIL-152 to eliminate sources of moderation from the imediate area of the new fuel vault.
In addition, NMP2 has metallic noncombustible covers over the new fuel vault.
These covers allow access to a group of fuel bundles which, if sprayed with an optimum density moderator, could not exceed k-eff = 0.98 due to the small critical array size. These covers are not required to be water tight at the connections since water " sheeting" does not constitute an optimum moderator condition.
In sumary, the intent of the procedural controls are to eliminate sources of moderation around the new fuel-vault in order to preclude the possibility of achieving a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers provide a means to preclude exceeding k-eff = 0.98 with optimum moderation by limiting the individual array sizes. Realisticithree dimensional Monte Carlo analysis accounting for neutron leakage have shown that k-eff remains below 0.98.
The following firefighting systems shall be functional.
l..
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a minimum of 1000 gpm at 125 psig or the.
permanent fire pump.
3.
The
. sprinkler systems in the railroad passageway.
l:
4.
Hose reels in the reactor building.
5.
Fire detector zones 242NW and 281NZ, or a fire watch.
Spent Fuel Storage Facility The design bases of the spent fuel storage facility are the following:
.The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand design seismic loads
. The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1).
The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
I The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91%
1 :
,w-m -. - -. -,. _,,
,._..__.,.rw_,-,,y_,.,,,,__v
._____m
_r
,--,,yr,,
rnoderator dens' condition rather than show cc
' lance to k-eff = 0.98 under all cond).;ons. These recommendations we.. first presented to the utilities via SIL-152 issued in March 1976.
NMPC has followed SIL-152 to eliminate sources of moderation from the immediate area of the new fuel vault.
In addition, NMP2 has metallic noncombustible covers over the new fuel vault.
These covers allow access to a group of fuel bundles which, if sprayed with an optimum density d
moderator, co::Id not exceed k-eff = 0.98 due to the small critical array size.
These covers are not required to be water tight at the connections since water " sheeting" does not constitute an optimum moderator condition.
In sununary, the intent of the procedural controls are to eliminate sources of moderation around the new fuel vault in order to preclude the possibility of achieving a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers provide a means to preclude exceeding k-eff = 0.98 with optimum moderation by limiting the individual array sizes. Realistic three dimensional Monte Carlo' analysis accounting for neutron leakage have shown that k-eff remains below 0.98.
The following firefighting systems shall be functional.
1.
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a minimum of 1000 gpm at 125 psig or the-permanent fire pump.
3.
The
-sprinkler systems in the railroad passageway.
l-4.
Hose reels in the reactor building.
5.
Fire detector zones 242NW and 281NZ, or a fire watch.
Spent Fuel Storage Facility The design bases of the spent fuel storage facility are the following:
The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand design seismic loads The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1).
The fuel assemblies l
are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 i
The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91%
- t
.~.~..._._ _ _...,--_ _
moderator' dens' condition rather than show cc
'lanco to k-eff = 0.98 under all cond)..ons.
These recommendations we._ first presented to the utilities via SIL-152 issued in March 1976.
NMPC has followed SIL-152 to eliminate sources of moderation from the immediate area of the new fuel vault.
In addition, NMP2 has metallic noncombustible covers over the new fuel vault.
These covers allow access to a group of fuel bundles which, if sprayed with an optimum density moderator, could not exceed k-eff = 0.98 due to the small critical array size. These' covers are not required to be water tight at the connections since water " sheeting" does not constitute an optimum moderator condition.
4 In sumary, the intent of the procedural controls are to eliminate sources of moderation around the new fuel vault in order to preclude the possibility of achieving a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers provide a means to preclude exceeding k-eff = 0.98 with optimum moderation by limiting the individual array sizes. Realistic three dimensional Monte Carlo analysis accounting for neutron leakage have shown that k-eff remains below 0.98.
The following firefighting systems shall be functional.
l.
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a minimum of 1000 gpm at 125 psig or the.
permanent fire pump.
3.
The sprinkler systems in the railroad passageway.
(
4.
Hose reels in the reactor building.
5.
Fire detector zones 242NW and 281NZ, or a fire watch.
Spent Fuel Storage Facility The design' bases of the spent fuel storage facility are the following:
4 The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand design seismic loads The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1). The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91% !
y
-~_
...e
.r -
,.___--....__,.._-,_-_,_-,..-.~._._~__..e._.,
..-...,.,_______-..,mm._~___.-
moderator dens' condition rather than show cc
' lance to k-eff = 0.98 under all condi..ons.
These recomendations we. _ first presented to the
. utilities via SIL-152 issued in March 1976.
NMPC has followed SIL-152 to eliminate sources of moderation from the imediate area of the new fuel vault.
In addition, NMP2 has metallic noncombustible covers over the new fuel vault.
These covers allow access to a group of fuel bundles which, if sprayed with an optimum density moderator, could not exceed k-eff = 0.98 due to the small critical array size. These covers are not required to be water tight at the connections since water " sheeting" does not constitute an optimum moderator condition.
In summary, the intent of the procedural controls are to eliminate sources
-of moderation around the new fuel vault in order to preclude the possibility of achieving a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers provide a means to preclude exceeding k-eff = 0.98 with optimum moderation by limiting the individual array sizes. Realistic three dimensional Monte Carlo analysis accounting for neutron leakage have shown that k-eff remains below 0.98.
The following firefighting systems shall be functional.
1.
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a minimum of 1000 gpm at 125 psig or the-permanent fire pump.
3.
The sprinkler systems in the railroad passageway.
l 4.
Hose reels in the reactor building.
5.
Fire detector zones 242NW and 281NZ, or a fire watch.
Spent Fuel Storage Facility The design bases of the spent fuel storage facility are the following:
The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand design seismic loads The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1).
The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91f. '
moderator dens' condition rather than show ce
'iance to k-eff = 0.98 under all condi..ons. These recomendations we. _ first presented to the utilities via SIL-152; issued in March 1976.
NMPC has followed SIL-152 to eliminate sources of moderation from the
~
.imediate area of the new fuel vault.
In addition, NMP2 has metallic noncombustible covers over the new fuel vault. These covers allow access to a group of fuel bundles which, if sprayed with.an optimum density i
moderator, could not exceed k-eff = 0.98 due to the small critical array size.. These covers are not required to be water tight at the connections i
since water " sheeting" does not constitute an optimum moderator condition.
In sumary, the intent of the procedural controls are to eliminate sources j
of moderation around the new fuel vault in order to preclude the i
I possibility of achieving a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers provide a means to preclude exceeding k-eff = 0.98 with optimum moderation by limiting the individual array sizes. Realistic three dimensional Monte Carlo analysis accounting for neutron leakage have shown that k-eff remains below 0.98.
The following firefighting systems shall be functional.
1.
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a minimum of 1000 gpm at 125 psig or the-permanent fire pump.
3.
The
. sprinkler systems in the railroad passageway.
l 4.
Hose reels in the reactor building.
5.
Fire detector zones 242NW and 281NZ, or a fire watch.
Spent Fuel Storage Facility The design bases of the spent fuel storage facility are the following:
3 The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand design seismic loads The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1).
The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 l
The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
l (typical)
Boron carbide - 48.91%
l 6-s 9
-, ~ - -,
,,-m-,,-.,,--.-,-,,,,,-.-~,--,,--,--,n.-,,--,,w_
-, - - ~ - -,, - - - - -
moderator dens' condition rathtr than show cc
'iance to k-eff = 0.98 under all condi..ons.. These recomendations we.
first presented to the utilities via SIL-152 issued in March 1976.
I NMPC has followed SIL-152 to eliminate sources of moderation from the immediate area of the new fuel vault.
In addition,.NMP2 has metallic noncombustible covsrs over the new fuel vault. These covers allow access to a group of fuel bundles which, if sprayed with an optimum density
' moderator, could not exceed k-eff = 0.98 due to the small critical array F
size. These covers are not required to be water tight at the connections since water." sheeting".does not constitute an optimum moderator condition.
In sumary, the intent of the procedural controls are to eliminate sources of moderation around the new fuel vault in order to preclude the possibility of achieving a uniform moderator distribution in the peak rance of'approximately 0.1 to 0.2 g/cc water.
Non-combustible covers
-provide a means to preclude exceeding k-eff = 0.98 with optimum moderation by limiting the individual array sizes. Realistic three dimensional Monte
. Carlo analysis accounting for neutron leakage have shown that k-eff remains below 0.98.
(
The following firefighting systems shall be functional.
1.
The construction or. permanent Gaitronics fire alarm system.
2.
' A fire pump capable of a minimum of 1000 gpm at 125 psig or the.
permanent fire pump.
3.
The
. sprinkler systems in the railroad passageway.
l-4.
Hose reels in the reactor building.
5.
Fire detector zones 242NW and 281NZ, or a fire watch.
' Spent Fuel Storage Facility The design bases of the spent fuel storage facility are the following:
The prevention of criticality during storage 4
The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand design seismic loads 4
i The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1). The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 i
The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91%
l f
9
-==--w.-
+-.r we-+=.--,.w,.-
e=.vww,,
.,..---,,,-..-y,-,-,,-.--_.-wy-%,
.ym
.yy.-,y-..q,,,-._,.--,_,-.-m-%,,,..r
moderator dens' condition rathtr than show cc
'iance to k-eff = 0.98 under all cond)..ons.
These reconsnendations we.. first presented to the utilities via SIL-152 issued in March 1976.
NMPC has followed SIL-152 to eliminate sources of moderation from the inmediate area of the new fuel vault.
In addition, NMP2 has metallic noncombustible covers over the new fuel vault.
These covers allow access
.to a group of fuel bundles which, if sprayed with an optimum density moderator, could not exceed k-eff = 0.98 due to the small critical array size. These covers are not required to be water tight at the connections since water " sheeting" does not constitute an optimum moderator condition.
In summary, the intent of the procedural controls are to eliminate sources j
of moderation around the new fuel vault in order to preclude the possibility of achieving a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers provide a means to preclude exceeding k-eff = 0.98 with optimum moderation by limiting the individual array sizes. Realistic three dimensional Monte.
Carlo analysis accounting for neutron leakage have shown that k-eff
' remains below 0.98.
4 The following firefighting systems shall be functional.
1.
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a minimum of 1000 gpm at 125 psig or the.
permanent fire pump.
3.
The sprinkler systems in the railroad passageway.
l:
4.
. Hose reels in the reactor building.
l S.
Fire detector zones 242NW and 281NZ, or a fire watch.
Spent Fuel Storage Facility The design bases of the spent fuel ' storage facility are the following:
The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand design seismic loads The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1).
The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91%
1 l
.. - ~..
..,.-_.-m-..-
.._._-~m- ~ ~ -.. - - -, - - -.. ~
mod:rator dens' condition rathcr than show cc
'iance to k-eff = 0.98
-l under all condi..ons. These recommendations wa.. first presented to'the j
utilities via SIL-152 issued in March 1976.
NMPC has followed SIL-152 to eliminate sources of moderation from the i
immediate area of the new fuel vault.
In addition, NMP2 has metallic i
noncombustible covers over the new fuel vault.
These covers allow access to a group of fuel bundles which, if sprayed with an optimum density moderator, could not exceed k-eff = 0.98 due to the small critical array size. These covers are not required to be water tight at the connections since water " sheeting" does not constitute an optimum moderator condition.
In sununary, the intent of the procedural controls are to eliminate sources
.of moderation around the new fuel vault in order to preclude the possibility of achieving a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers provide a means-to preclude exceeding k-eff = 0.98 with optimum moderation by limiting the individual array sizes. Realistic three dimensional Monte Carlo analysis accounting for neutron leakage have shown that k-eff i
remains below 0.98.
i i
The following firefighting systems shall be functional.
1.
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a minimum of 1000 gpm at 125 psig or the-
]
permanent fire pump.
3.
The sprinkler systems in the railroad passageway.
l:
4.
Hose reels in the reactor building, 5..
Fire detector. zones 242NW and 281NZ,.or a fire watch.
i Spent Fuel Storage Facility The design bases of the spent fuel storage facility are the following:
The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding l~
Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand design seismic loads The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1).
The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91% l l
. ~.
moderator dens' condition rather than show cc
'iance to k-eff = 0.98 i
under all condi..ons. These recommendations we.
first presented to the
+
..*?
utilities via SIL-152 issued in March 1976.
NMPC has followed SIL-152 to eliminate sources of moderation from the imediate area of the new fuel vault.
In addition, NMP2 has metallic noncombustible covers over the new fuel vault.
These covers allow access to a group of fuel bundles which, if sprayed with an optimum density moderator, could not exceed k-eff = 0.98 due to the small critical array.
size. These covers are not required to be water tight at the connections since water " sheeting" does not constitute an optimum moderator condition.
In summary, the intent of the procedural controls are to eliminate sources of moderation around the new fuel vault in order to preclude the possibility of achieving a uniform moderator distribution in the peak range of approximately 0.1 to 0.2 g/cc water.
Non-combustible covers i
provide a means to preclude exceeding k-eff = 0.98 with optimum moderation
.by limiting the individual array sizes. Realistic three dimensional Monte Carlo analysis accounting for neutron leakage have shown that k-eff remains below 0.98.
The following firefighting systems shall be functional.
1.
The construction or permanent Gaitronics fire alarm system.
2.
A fire pump capable of a. minimum of 1000 gpm at 125 psig or the.
permanent fire pump.
3.
The sprinkler systems in the railroad passageway.
l-4.
Hose reels in - the reactor building.
5.
Fire detector zones 242NW and 281NZ, or a fire watch.
l Spent Fuel Storage Facility The design bases of the spent fuel storage facility are the following:
The prevention of criticality during storage The prevention of damage of the fuel Adequate radiation shielding Protection against radioactivity release Adequate monitoring of the fuel storage Ability to withstand._ design seismic loads The fuel assemblies are held in a vertical position by the spent fuel pool storage racks (FSAR Figure 9.1-4 in Attachment 1).
The fuel assemblies are supported within the fuel storage racks by a stainless steel plate located approximately six inches above the fuel pool floor. The spent fuel racks absorber material is Boraflex.
The composition of Boraflex is as follows:
Boron Carbide (8 C) Powder in Silicon Rubber (Slygard 170A and 1708) 4 The finished product 810 areal density is 0.028 gm/sq. cm.
Percent by weight - Elastomer - 51.08%
(typical)
Boron carbide - 48.91%
4 4 0
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