ML20054F244

Forwards Util SAR of SEP Topic IX-5, Ventilation Sys. Spent Fuel Pool,Radwaste Area & Turbine & Svc Bldg Ventilation Sys Require No Mods

ML20054F244
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	06/11/1982
From:	Vincent R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Crutchfield D Office of Nuclear Reactor Regulation
References
TASK-09-05, TASK-9-5, TASK-RR NUDOCS 8206150356
Download: ML20054F244 (9)

Text

-_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

e.

Consum8f8 Power Company General Offices: 212 West Michigen Avenue, Jackson, MI 40201 * (617) 788-0650 June 11, 1982 Dennis M Crutchfield, Chief Operating Reactors Branch No 5 Nuclear Reactor Regulation US Nuclear Regulatory Comission Wasnir.gton, DC 20555 DOCKER 50-155 - LICENSE DPR DIG ROCK POINT PLANT - SEP TOPIC IX-5, Ventilation Systems Attached is the Consuoers Power Company evaluation of SEP IOPIC IX-5, for the Big Rock Point Plant.

m A

','CtT W

Robert A Vincent Staff Licensing Engineer CC Director, Region III, USIaC

!aC Resident Inspector-Big Rock Point 3

8206150356 820611 30 PDR ADOCK 05000155 p

PDR

1 BIG ROCK POINT NUCLEAR POWER PLANT-SAFETY ASSESSMENT REPORT TOPIC IX-5: VENTILATION SYSTEMS 1.,0 INTRODUCTION The objective of this topic is to assure that the ventilation systems have the capability to provide a safe environment for Plant personnel and suitable and controlled environment for engineered safety feature components following certain anticipated transients and design basis accidents.

2.0 REVIEW CRITERIA The criteria and guidelines used during the review of the various Plant

' ventilation systems to determine if these systems meet the topic safety objectives are as detailed below:

2.1 Standard review plan, Section 9.4.1, " Control Room Area Ventilation System."

2.2 Standard review plan, Section 9.4.2, " Spent Fuel Pool Area Ventilation System."

2.3 Standard review plan, Section 9.4.3, "Radwaste Area Ventilation System."

2.4 Standard review plan, Section 9.4.4, " Turbine and Service Building Ventilation System."

2.5 Standard review plan, Section 9.4.5, " Engineered Safety Feature Ventilation System."

3.0 EVALUATION The systems reviewed under this topic are the control room area venti-lation system, spent fuel pool area ventilation system, radwaste area ventilation system, turbine and service building ventilation system, and the engineered safety feature ventilation system. These ventila-tion systems are not safety related and will not function following loss of offsite power.

3.1 CONTROL ROOM AREA VENTILATION SYSTEM The control room area ventilation system provides a controlled environ-ment for the control room and the control room panel. The system utilizes a mixture of fresh air and recirculated air which is filtered after mixing in the mix plenum. The air will then be heated from the heat-coil supplied from the steam boiler heating system or cooled from the cooling coil supplied from the service water pumps feeding from the lake. The air is then humidified and delivered into the control room nu0682-0095a-43-32

2 with a blower fan. Reference attached Drawing No 0740G40124 for sche-matic of control room area ventilation system.

The control room ventilation system will not function following loss of offsite power as it does not have emergency power available. Room temperature increase due to high ambient temperatures and temparature increases from electrical equipment in the area is not likely to cause failure of equipment. This area was not considered hostile in our sub-submittals on Environmental Qualification dated 10/31/80 and 1/30/81.

As a nonhostile environment, the area would experience an insignificant rise in temperature due to operating equipment heat loss.

Typically, Big Rock Point equipment is designed to operate in ambient temperatures up to 104*F.

Exterior daytime temperatures at the Plant normally range from 75'F to 90*F during the months of July and August.

Therefore, temperatures would not affect the operation of equipment following a failure of the ventilation system.

The control rcom habitability requirements will be addressed as part of the probabilistic risk assessment submittal in the near future, as described in our April 16, 1982 letter from T C Bordine to D M Crutchfield.

3.2 SPENT FUEL POOL VENTILATION SYSTEM The spent fuel pool ventilation system is part of the reactor contain-ment ventilation system. The function of the spent fuel ventilation system is to maintain ventilation in the spent fuel pool equipment areas, permit personnel access and control airborne radioactivity in this area during normal Plant operation.

Ventilation air to the reactor containment building is controlled to maintain a slight negative pressure within the building. The ventilation building is attached to the containment building which contains the inlet for outside air into the containment building, a filtering system, a heating coil supplied by the steam boiler heating system and an air intake line bypassing the heating coil. Two air supply fans are located inside containment. Each air supply fan suction has an open/ shut damper positioner with initiation integral to the fan starting circuit and inlet vanes controlled by indoor / outdoor differential pressure to regulate airflow.

A reactor building vacuum relief line with damper control integral to supply air fan motor starting circuits is open to the building when both supply air fans are stopped, insuring a free path for outside air in the event that the building vacuum must be relieved. Iko 24" diameter pneumatic cylinder and spring-operated check and butterfly valves, connected in series, are provided for the supply air inlet and for the exhaust air outlet to isolate the reactor building ventilation air. These valves are arranged for spring closing and air opening and are closed either automatically or manually during all scrams.

nu0682-0095a-43-32

3 The spent fuel pool ventilation system, which is part of the reactor containment ventilation system, has an exhaust air vent located at the top edge of the fuel pool. The fuel pool area vents to the stack through the exhaust system which is a draft induced system. Reference attached Drawing No 0740G40125 for schematic representation of spent fuel pool area ventilation system. Since the fuel pool is located in the reactor containment building there is no need for the ventilation system to work post-accident.

3.3 RADVASTE AREA VENTILATION SYSTEM The radwaste area ventilation system is vented from the condensate pump room ventilation system, which is part of the turbine and service building ventilation system.

The condensate pump room ventilation system utilizes both outside air and recirculated air to provide ventilation to the radwaste area. The air passes through a filter and can either pass over a heating coil, which is supplied from the steam boiler system, or can bypass the heating coil. A fan will deliver the air into the condensate pump room and into the radwaste area. Additional airflow can be obtained by opening the cover block on the outside air vent and increasiIng the opening of the exhaust damper. The exhaust is induced by the exhaust fans and is then vented through the stack. Reference attached Drawing No 0740G40124 for schematic representation of radwaste area ventilation system.

The radwaste system is not designed for post-accident cleanup and will not be required; therefore, additional ventilation will not be required.

3.4 TURBINE AND SERVICE BUILDING VENTILATION SYSTEM The turbine and service building ventilation system is composed of three air supply systems. These include the condensate pump room heating and ventilation system, the shop heating and ventilation system and the equipment room cooling system.

3.4.1 The condensate pump room ventilation system utilizes both outside air and recirculated air to provide ventilation to the condensate pump room. The air passes through a filter and can either pass over a heating coil, which is supplied from the steam boiler system, or can pass by the heating coil. A fan will deliver air into the condensate pump room and will then be distributed to the radwaste area (Refer-ence 3.3 - Radwaste Area Ventilation System) and to the condensate demineralizer room.

Equipment is this area is not required to operate in a post-accident condition.

3.4.2 The shop area ventilation system utilizes both outside air and recircu-lated air to provide ventilation to the shop area room. The air passes through a filter and can either pass over a heating coil, which is supplied from the steam boiler system, or can bypass the heating coil.

nuC682-0095a-43-32

4 A fan will deliver air into several areas including.the tool crib, shop, storeroom, condenser area, pipe tunnels and the decontamination washdown areas. An additional outside air intake supplies airflow to the pipe tunnel and the area under the turbine. Equipment in this area is not required to operste in a post-accident condition.

3.4.3 The equipment room area ventilation system provides cooling to the heating and ventilating equipment room and the air compressors and electric equipment room. The system recirculates air within the room through a cooling unit and supplies ventilation to the lube oil storage room and the turbine lube oil tank.

The equipment room contains equipment that will be required to operate post accident. Ventilation will not remove contaminates, therefore, the area will be evacuated in a post-accident situation.

With loss of offsite power, the ventilation system and the station power transformers, which are the primary source of heat, will not operate. Ventilation and temperature control for the equipment room under the above condition may be adequately maintained by opening any one of three doors in this area to the outside environment.

The turbine and service building. ventilation systems are forced-draft induced systems with draft induction, the result of two exhaust fans which also push the exhaust air through the exhaust ventilation stack.

The turbine building and service building will not require post-accident ventilation for either heat or contamination removal. Refer-ence attached Drawing No 0740G40124 for schematic representation of turbine and service building ventilation system.

3.5 ENGINEERED SAFETY FEATURE VENTILATION SYSTEM Three areas to be considered under the engineered safety feature venti-lation system are the emergency diesel generator room, the screenhouse and the core spray pump room.

3.5.1 The emergency diesel generator room, located in the screenhouse, has a passive ventilation system. The passive ventilation system consists of ventilation louvers which allow outside air to' enter the emergency diesel generator room. Exhaust from the diesel engine is through the roof of the building. This area is not adjacent to either the containment or turbine buildings and is not exposed to radioactive contaminates during normal or post-accident conditions; therefore, ventilation for the purpose of reduction of contamination is not necessary. Heat rise from the diesel generator will not impair its operation however, access doors could be opened to ventilate the room.

3.5.2 The screenhouse contains the fire safety system (diesel and electric fire pumps). The ventilation system consists of ventilation louvers on the outside walls with circulation fans inside the screenhouse. The screenhouse is a separate building located away from the containment and turbine buildings and is act exposed to radioactive contaminates nu0682-0095a-43-32

5 during normal or post-accident conditions of the Plant; therefore, ventilation for the purpose of reduction of contamination is not necessary. Since the heat load from the fire pumps (only major equipment running under post-accident condition with loss of off-site power) is relatively low, and since there are numerous heat sinks in the room, operability should not be impaired by a loss of ventilation. Again, however, doors can be opened to allow passive ventilation of the room.

353 The core spray pump room houses the core spray pump and a heat exchanger with supplies emergency cooling water to the reactor vessel and the containment building. This area is not ventilated.

The heat rise in the core spray pump room area following an accident due to recirculation of the containnent sump water is not expected to raise the room temperature greater than 1520F (reference CPCo submittal to NRC -dated 10/31/80 and 1/30/81). This heat load is not detrimental to the operation of the core spray pump. This room is not exposed to radioactive contaminates during normal or accident plant operation; therefore, ventilation for the purpose of reduct.on of contamination is not necessary. The room also is not habitated during operation of the equipment.

4.0

SUMMARY

The spent fuel pool ventilation system, radwaste area ventilation system and the turbine and service building ventilation systems are forced-draft induced ventilation systems and are designed to circulate air from areas of least contanination to areas of greater contamination. These potentially contaminated areas are ventilated so as to avoid the existence,of any hazardous condition to the Plant during normal operat17n. These ventilation systems are not designed to remove contaminants and are not designed for post-accident use.

In the event of loss of offrite power the systems wculd not be available for use. The areas described above are exhausted through the ventilation stack.

Consumers Power Company recognizes that these systems do not meet current requirements for safety-related ventilation systems. However, the areas supplied by these ventilation systems will not be habitated in a post-accident condition or will not require ventilation to remove contaminants. The equipment room although designated as an evacuation area would itself be evacuated if the radiation or contam-ination levels rose above limits set in the Site Emergency Plan.

Appropriate self-contained breathing apparatus is available for entries into various areas if required in the post-accident condition.

l Futhermore, with the exception of the core spray pump room and spent fuel pool area (containment building) none of the other areas of l

l concern is considered a hostile area in the CPCo Electric Environ-j mental Qualification submittal. As such, it was determined these areas would see normal environment or only a slight rise in room temperature due to operating equipment heat loss. Ventilation to remove excess heat is therefore, not required. Modifications are not envisioned for these ventilation systems, f

I

o 6

The control room habitability will be address d in the Consumers.

Power Company probabilistic risk assessment to be submitted at a later date.

o k

I l

t I

1 5

I i

e i

g.p.s3 g** -

..ud J ud ;*.... :... i a

m s

-,tl 1l

, il 4

c+i,fj$@-

l,I, U $.'l$.':i -j e'g i

n a

1'h 5

1-s i

o<

lf !l

!I L

s id! L lil M!i l liil !

4 e

.na

+

~

,t gn o

2 I

g

!8 s.8 25P '!

j.

,! i'I g

F a

! l' i

g s

1 l

1. g f;3--

g.SF.2 w.

1

-]

9g.-

3

..3 d.

g '.29%{

' t g +d 6%.,,

u

$.a.. c..i

@ % w % f7s -Im 4f8 g

s s._

,e a

f f@

N 3 7 h.)

t o

j'% (pi-I i,.

b N i

il 4f

,M $ V j1 h

1is

-w

,ani p1

/1 m

'd l

II E h

j1 =~

E f,'h 1

p r

T,I $e i

atllj"ib N

7P-7A y

t:-WHi!! rir i u-y =. -

nn

+;py,.

u a

/

+

s Ih r!

- m!j

,f

. swr mg!!g 1

814,i

,o. 4. w+ -- y g. e.9..! f,u q.

4 !

*e s

f.. -

,ir"

-.k-- *- ' f j @

.M

-4)

!$j;;

I+

g l;

! l 2y%g j

i i

i a94 r

t I

' -.... ine

~I n-I i

+

4 %,.,...,. - -...-. _

g g

i.',1

- % !gJ!::

I k,

g1 jg* ! ;3.o ;

ji

}

g+i-,

i

" I*.'

E i

e

,3 *T,,, 'q3

^

P 3,

}

s, l

k., }I H

in i

n 3

4;

~l

@ \\ 1:!,

!u=

l s

a o TJ.* a

• t-81

.~

1 i

D. :

5 l

9

's 9-

=

5 kb]

k

~

{i ssJ i..

d' f

3 c ae r

4}j hl gM q n?iig Wg,,Ip-

. 4 _ p,i p, g

. m g i ? J l a p a sy,-

n m ll ilgd I

3-

,m,_

py agi ig; fy ihy, Wrd.dsnat<t, pa

'e i

> i m a PhslstMj"[dY 2 M 8M N6T ia.

I c.

1 1y

! 4/.

h 2.e

.~.

m :,i h

s b'.

1 LbL m$

p.k

li r

=

oe h

l l

3 1

^

?. n

{ f$

N j

A sa g L 4.

ip r

m, )> gp 4pc.-.).

gh

[

6 3

!l r-W ',.,

L.,

s.

j s.:b.r}.

i s

la a

l 4

a. ! r S c,1 lg

}

d w----_

)

2.

(

i

$})

" ifiinll r-e.u E.i Sei L.< opi R+j u,tk.::

}l1 l

y 4 l-Q; g &6

.. EF) -

.4

?

O re*

t 4

-'t" ;.

dp 9-4 a

=

?p r=== =

,!g g ei,.

I g y t

l_

'l!

U s

'a m

1

}4):

\\ i.,,

L-.:=j l

,l8 h

g5 W M_,,

.g l

3 I

ch I# j,i-! ',Y%,. r ) :

i

---T

+

if ffI ;sm-45h D

DE y

I.

~

i

' [

a

/i M 4tpt j jp",p_p!

n%y 1i 1 : iah 10$

0 f

L

-]g ' +.9.; /t, :

1J 3

i b 50 tm

.,' j 4,7;_

m I

E g

j IfIII i

.(II qL! ilf I'i fd*I 2

[..gVug/ ' ;j!q 3

n 5

s

% ji/ g\\T h Ip--J T

jj

• Eg

nE S 4 < s] j' 1 w. nf,2", 4 fa im /wM j >}r.j - - M e;4 7 g;, f/ y% c.h: p@ 4 a..a. j M r-i l i H4h' 9 ',9*w. M d [ l '*---d - hl @ E'1 ,..., ' g \\ t'd.L-- - - Ig-- - - - 8 f .)x.= m j, d I f ~ a' e 8 -r'>kP 'p. - -

e. s::.

...'p-@.4l hN;d 4 .I

h 4

-s2 I { i j '.h 7,s..( .{ _.____a ej i ~ * * !I- 'l 0' L. - _. _ _ _.. Lt. . _ _.If_. 8 q[g. $ ; . i_ 3 2 I l - n ' p'. J.p 3 $ I--- i r3 .f.i @to af g 'j I 3..g;it. k,. A';;'ft.1 ' i ii ..,.- '-y G 4 q l g j .sy d ? \\ l 't y i i i 1 3.i &@g '. ---5m :l ' ,M*-M[~ }yy j FW 9-: 3 r l 3 -= n u3A 2 .est. .s .;l P llf. g .y 8" _ 3 '- ] j g g heb a -__: m, g +

'iL! ;r;, ; i

= _ a-_ i

g, j l' riWt m W W,t.

z j:t li! i.i !i! k.fb 5, (/ ! { i c 3 A.:2s + 8, 3 tlhby [ i 5 d.p s.... m "'1 [ / s /