ML20247L822

Proposed Tech Specs,Changing Sections 2.19 & 3.2 Re Control Room Air Treatment Sys.Discussion,Justification & NSHC Encl

ML20247L822
Person / Time
Site:	Fort Calhoun
Issue date:	09/08/1989
From:	OMAHA PUBLIC POWER DISTRICT
To:
Shared Package
ML20247L798	List: ML20247L794 ML20247L811 ML20247L822
References
NUDOCS 8909250070
Download: ML20247L822 (10)

Text

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' 1 An ".lir/ Suilding, - Elevations' 971 and .969. ;iest

~2 'Auxilia:/ Suilding, Elevation 989 East ,

7 M: N-13 Auxiliary 3uilding,. Elevation 989, Lower Electri:21 3, .

?cnetratien RoomL(Room 20)

?k. Auxiliary 3uilding, Elevation 989, Air Cc=zresser O,' Room (Room'19)'

L5 Auxiliary 3uilding, Elevation 1C07, Corrider.26, 3co=s

, , , 58,l59,s and 60 o-

Auxili r/ Building, 21evations 1007 and 1011, Un=0ntr:11ed' 7~

Aux 111e.r/ Building, Elevation 1013, Upper Electrical

?snetration Room (Roo: 57) o

' Auxilia:/ Suilding..- Elevatiens 989 and 1007, 3cri: Ae:.:

Tank Area, . Oru==in:; Area, .:*ev Fuel Area

~9.

.Auniliar/ Su11 din; , Elentien '1036, 0:ntr:1 :<:cn ce;;ex, Ccntrol Roc = Eallways 10 "ontairent, Elevati:n 1012. RC Pu=p Cavitias

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11- , Contai=ent , Elevation 99L' t12 Containment, Elevation 10L5 13 Auxiliary 3uilding, Ilevatien 1025 (Roc =s 69 and Til

.ib Turbine Suildin;, Elevatien 990

.15- Tur:'ine Building, Elevatica 1011 16 Turbine Building, Elevation 1036

17- COntain=ent Fans-VA-33 and 7A ~D 13 Conta1=ent Fans 7A-3A and 7A-7C

19 Contai=ent Fans VA-2A and VA-23 20

?21 Control Room Panels C3-1/2/3 Return Air Contai =ent :!DWC Fans VA-12A and VA-123

'22 ' Contai=ent ? urge Discharge Fans 7A-32A and 7A-323 yq. 23 .DC-2 Room Exhaust Tan, VA-523 OL Contai=ent ?arge Supply Fans VA-2LA and 7A-2'.3 251 Control Roc = and Hallway ventilation Due::

'^6' Auxiliary 3uilding (Controlled) Supply Fans, 7A-35A and 7A-253

.27 'Auxiliar/ Suilding-(Controlled) Exhaust ?ans, 7A LOA, 7A i.03, and 7A h0C 23 Auxili r/ Building (Uncontrolled) Supply Fans, 7A--5A and VA--53

~29 - Auxiliary =3uilding CJn:cntrolled) Ixhaus- 72n. '-

20; Auniliarf Building Ilevator .Ihaft Fan, 7A-31 31 Control Room Air Conditioning: Tans, IA--uA 'nc . ".'s -- 62 32 OG-1 Room Exhaust Fan, 7A-52A

?? Auniliar/ Euildin , Ilevation '036

?.oce 31.

71:.nt. prinxier F1;v

?" Auxiliar/ lui dint;, 20-2 (Recm ol)

..u nun ;r/ 2uil.;in.;, 20-1 i 3ocm 6 2.'

i~ :ntaxe Str r " a ~ "aing 2av Water ? == Ecer

. uni iary 3ut'. ding : pen Jtair.el-M 10 suxi'iary 3 *,14 p \ .,

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. 3.0 StJRVEILLANCE:RE0tifREllEf:TS i3 1 'Ecuipment and Sainplino Tests.

Applicability

). ^

fp ' Applies (.to: plant equipment and,cerditions. related to safety.

L Objective N To specify the minimum frequency and type of surveillance to be applied 'to critical plant equipment and conditions.

' Specifications f'p; ' 3-4Equipment o

x.

and 3-5' and sampling tests-shall be conducted as specified in Tables:

g p Basis _

'The equipment testing and. system sampling frequencies specified in ETables 3-4.and 3-5 are considered adequate, based upon experience to ,

maintain the status of the equipment,and systems so as to assure safe:

operation. Thus, Lthose systems where changes might occur relatively rapidly are ' sampled frequently and those static systems not' subject'to

- changes.are. sampled less frequently, -

AQah) <e%AA

' The controli room air treatment / system consists ofAhigh efficiency o particulate air. filters (HEPA) land %s charcoal adsorbers. HEPA ifilters'are ch;; h; ^#installed beforedthe charcoal'adscrbers.t; i,n ie.t thiicdhc :d:c-b: :r The charcoal' adsorbers are installed to: reduce .the potential intake of. fodine to .the control room.

performance..The in-place test results will confirm system integrity and.

The laboratory carbon sample testi results should mdicate methyl iodide removal efficiency of at- least percent for expected accident; conditions.

Y v. B 2,$

The spent fuel storage-decontamination areas air treatment system is designed vent duringto.refueling filter theoperations.

building atmosphere to the ' auxiliary building The charcoal adsorbers are installed to reduce the potential release of radiciodine to the environment.

< of the' filter system.In-place testing is performed to confirm the integrity-to. insure capability for the removal of radioactive iodine,The charcoal ; t 1

3-17 Amendment No. 15, 67, 122

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ATTACHMENT B I

I

t' i ;o Discussion, Justification and No Significant Hazards Consideration-The proposed. changes to Technical Specifications Sections 2.19, page 2-90; and 3.2, pages 3-17, 3-17a, 3-20, 3-20a, 3-20b and 3-20c are required to incorporate modifications that will be made to the Control Room Air Treatment System.

The Control Room Air Treatment System must meet the requirements of 10 CFR 50, Appendix A, General Design Criterion 19 (GDC 19), NUREG 0737, Item III.D.3.4, Standard Review Plan (SRP) 6.4, and Regulatory Guide (R.G.) 1.52. A control room survey was conducted by the NRC at Fort Calhoun Station in October,1987.

The survey determined that an excessive amount of unfiltered air.was being pulled into the control room envelope. Calculations performed by OPPD indicated that these amounts of unfiltered air would result in operators receiving more than the 30 REM thyroid dose limit allowed in a 30 day period post accident. Interim measures were taken to protect the operators while OPPD evaluated the Control Room Air Treatment System. Several modifications were made to the system to reduce air inleakage but it is necessary to replace the existireg charcoal filter train to reduce radioactive iodine to acceptable levels.

The existing single, 90% efficient charcoal filter unit is being replaced by two, full capacity 99% efficient filter trains. Calculations using the increased efficiency show that the new filters will reduce exposures to the operators below the GDC 19 dose limits from the combination of all sources of airborne radiation. A change to the Technical Specifications is necessary to revise the carbon testing requirements to conform to those given in R.G. 1.52 and ANSI N510-1980 used by the testing laboratories. '

Since the installation of the new charcoal filter units in room 81 will introduce an increased fire load in the area, the filters are equipped with fire detection and deluge systems that are designed to alert the operators and extinguish any fires without reliance on existing fire protection equipment in ,

the arca. Two new fire zones are being added to the Technical Specifications  !

to conform to the modification of the fire system caused by the addition of the new air filter system.

i No Significant Hazards Consideration This proposed amendment does not involve a significant hazard consideration because the operation of Fort Calhoun Station in accordance with this amendment would not:

1. Involve a significant increase in the probability or consequences of an accident previously evaluated. ,

The charcoal contained in the new filter units will increase the fire loading in Room 81. However, the new fire loading sources will be equipped with new detection, monitoring, ar.d deluge systems. The existing filter system is not equipped with fire detection, so this represents an increased Attachment B i

i

g My g y, , i

<j M( . , . .]

e :: y  ;

e . ,;c'  ;

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4- . .

'l. level of fire detection capability. Therefore, the fire' detection and' .

N* w/ ..

~ suppression' capabilities for the plant will not be degraded,.and the

. consequences of'an accident previously_. evaluated will not;be increased..

1 E' I Dose c' calculations 'show that the.new' filter system will prevent the j

-o)erators from exceeding the'10 CFR 50 Appendix A GDC 19 dose limits from i x

tie combination of all sources of airborne radio' active iodine.

+

=The consequences of an accident previously analyzed will not'be increased because the testing requirements given in Table 3-5 are' being. increased,  !

resulting,in a more..e fficient filter thus' lowering the doses in the control j

room. . '

2.. ' Create the possibility of a new or different kind of accident from any accident previously evaluated.

TheJaddition of two new fire detection zones will not create a new or l different kind of. accident from any previously evaluated since there will ei

, ~ be.new monitoring; and deluge. systems installed for each new area. o

The new filtration-system will consist of redundant 99% efficient units

'rather than the single 90% efficient configuration that currently exists. q

This does:not~ create the' possibility of a new or different kind of accident from any.previously evaluated. R i

>\

3. . Involve a significant reduction in a margin of safety.

- The"new monitoring and deluge systems for.'each unit are designed to alert

' the operators and extinguish any fires without reliance on-any existing  !

fire protection equipment-in the area. Since.the units'are equipped with their;own monitoring and deluge systems, the margin of safety of any existing system is~not reduced.

Dose calculations show that the existing single 90% efficient filter unit does not' provide enough iodine' removal. capacity to achieve the design dose riitait.of 30 RER (SRP.6.4) to the thyroid. 'In addition, a review of the design requirements stated in R.G. 1.52 showed the existing filtration system and associated isolation dampers to not meet the redundancy criteria.

The new redundant 99% filter trains and associated bubble-tight dampers

- will provide the required iodine removal to meet the dose limit as well as j all design requirements of R.G.1.52, (i.e., redundancy, local and remote j indication, humidity control, etc.). '

~Therefore, it can be concluded that the new filtration system will not  ;

reduce the margin of safety. '

Based on the above considerations, OPPD does not believe that this amendment 'I involves a significant hazaid consideration. l l

Attachment B

! l

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