. REGULA4Y INFORMATION DISTRIBUTIOQYSTEM (RIDS)

ACCESSION.NBR:83021,80471 DOCDATE: 834;024S NOTARIZED: NO DOCKET # FACIL:50-331 Duane Arnold E.nergyCenter, Iowa Electric Light & Pow 05000331 -AUTHNAME AUTHOR AFFILIATION RO0TL.D. Iowa Eleatrjc Light & Power Co,

RECIPNAME RECIPIENT AFFILIATION DENTON#H, Office of Nuclear Reactor Reguation, Director

SUBJECT: Forwards administrative control procedures & info re internal & boubdary exemption requestseconfirming 830131 discussions concerning request for exemption from 1OCFR Os, App R requirements.kelated drawings enc,

DISTRIBUTION "CODE,: AO6S COPIES tRECEIVED:LTR J ENCLE TITLE: 'OR Submittal: FieProtection

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20. tNCL

Iowa Electric Light and Power Company Februar 15 1983

NG- 3-060

LARRY D. ROOT ASSISTANT VICE PRESIDENT NUCLEAR GENERATION

Mr. Harold Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject: Duane Arnold Energy Center Docket No: 50-331 Op. License No: DPR-49 10 CFR 50, Appendix R Exemption Requests

Dear Mr. Denton:

Attachments 1 and 2 to this letter confirm the information discussed at a January 31, 1983 meeting with your staff. This confirmation was requested by your staff to enable comp etion of the review of our requests for

exemption from the requirements of 10 CFR 50, Appendix R Section III.G.2. For ease of reference, the information in Attachment I of this letter is provided in the same

format as Attachment 4 to Iowa Electric letter NG-83-092, dated January 10, 1983 which responded to the Staff's draft SER.

Based on discussions with your staff at the meeting mentioned above, we are confident that the attached information, in conjunction with that transmitted

by our January 10, 1983 letter, demonstrates that the level of safety provided in

each instance will be equivalent to the technical requirements of Appendix R, Section III.G.2. We believe that under existing NRC guidance, our proposed exemptions will be approved and that an appeal meeting (requested in our

January 10 letter) will therefore be unnecessary.

We intend to review the impact of these requirements on our Plan for

the Integrated Scheduling of Plant Modifications described in our letter of November 12, 1982. We will inform you of any significant modifications

to the

Plan which may be necessary. Very truly yours,

8302180471 830215 Larry D. Root PDR ADOCK 05000331 Assistant Vice President F PDR Nuclear Generation

LDR/SLS/dmh* Attachments

cc: S. Swails D. Arnold L. Liu S. Tuthill F. Apicella NRC Resident Office A Commitment Control No. 82-0515

General Office * PO. Bolc 351 * Cedar lapids, Iowa 52406 * 319/398-4411

9 Attachment 1The following information is provided to confirm discussions with NRC staff on January 31, 1983 regarding Iowa Electric's requests for exemption from the requirements of 10 CFR 50, Appendix R, Section III.G.2. For ease of reference, this information is provided in the same format as Attachment 4, to Iowa Electric letter NG-83-0092, dated January 10, 1983.

I. Internal Exemption Requests

A. Zone 1-G

Iowa Electric clarifies the statement "...enclose all Division 1 cables in Zone 1-G in a 1-hour fire barrier." to mean all Division 1 cables and instruments within Zone 1-G-required for safe shutdown will be enclosed in a 1 hour fire barrier. The listing of cables to be enclosed can be ascertained from Appendix C of the June 22, 1982 response to Appendix R and is repeated below for your reference. If redundant instruments in the common instrument rack cannot be wrapped in a'1 hour fire barrier due to clearance problems, the instruments will be relocated, as necessary.

Tray/Conduit

1C109 15K 1B195

Cable

IR1202V,W

Function Code

B5, Cl

Function

Recirculation Pump B running, input to LPCI Loop Selection logic.

B. Zone 7-E

Iowa Electric will enclose all Division 1 cables required for safe shutdown within zone 7-E in a 1-hour fire barrier. A tabulation of these cables, their conduits, and the function of each cable is provided below.

Conduit Cable Function Code

IM744 lK111

lV7A

1L507 IV7B,C,D 1lll 1B3213C

1L508 lDlll8A 1Kll2 1B3213A

1A311I

1L509 lKl08

1L510 1K109

lA311C

1A311D

1L519 lDllllA lKl10 lDlll2A

1B3214E

1A311K

1J379

Kl

Kl K1

H1 Kl Gl

Gl

Gl

Hl Hl Fl

Gl

Diesel Gen Room Supply Fan

Diesel Gen Room Supply Fan Diesel Gen Room Fan IV-SF-20

Diesel Diesel Diesel

Gen Excitation Panel Feed Gen Room Fan IV-SF-20 Gen FDR BKR 152-311

Diesel Gen FDR BKR 152-311

Diesel Gen FDR BKR 152-311

Diesel Gen Cont Panel Feed Diesel Gen Cont Panel Feed Emer Serv Wtr Pump 1P-99A

Diesel Gen FDR BKR 152-311

Junction box for above cables-1-

Function

C. Exemptions From Full Zone Fire Suppression

The following information provides the details of the proposed spot fire suppression systems in each zone. This design is preliminary, any changes required due to unforseen interferences, construction limitations, etc. will not reduce the level of fire protection from that represented by this design. Although not specifically indicated,the design for each zone includes consideration of water spray onto electrical equipment and protection from the spray where appropriate.

1. Zone 2-A

The spot suppression system for Fire Zone 2-A is depicted in Figures 1,2,3, and 4. This system provides fire suppression coverage for the Division 1 cables in Fire Zone 2-A which will be enclosed in a 1 hour fire barrier. In addition, the sections of conduits 1M148 and 1D149 which pass through Zone 2-A (shown on Figure 6) and carry Division 1 cables from Zone 2-D to Zone 3-A will be enclosed in a 3 hour fire barrier. This effectively removes these sections of conduits from Zone 2-A.

2. Zone 2-B

The spot suppression system for Fire Zone 2-B is depicted in Figure 5. This system provides fire suppression coverage for the Division 1 instruments and cables in Fire Zone 2-B which will be enclosed in a 1 hour fire barrier. If redundant instruments in the common instrument rack cannot be wrapped in a 1 hour fire barrier due to clearance problems, the instruments will be relocated, as necessary.

3. Zone 2-D

The spot suppression system for Fire Zone 2-D is depicted in Figure 6. This system provides fire suppression coverage for the Division 1 cables in Fire Zone 2-D which will be enclosed in a 1 hour fire barrier.

4. Zone 3-A

The spot suppression system for Fire Zone 3-A is depicted in Figure 7. This system provides fire suppression coverage for the Division 2 cables in Fire Zone 3-A which will be enclosed in a 1 hour fire barrier. The fire hazards analysis identifies-a 30 gallon drum of Agitene as a hazard in Zone 3-A. The handling of this and all flammable fluids within the power block buildings is in accordance with Iowa Electric Administrative Control Procedure 1406.6 "Control of Combustibles". This procedure is included with this submittal as Attachment 2 for your reference.

-2-

* 9

5. Zone 4-A

The spot suppression system for Fire Zone 4-A is depicted in Figure 8. This system provides coverage for all equipment in Fire Zone 4-A whose loss due to fire could result in evacuation of the control room and resultant use of the alternate shutdown capability. This suppression system provides a level of protection equivalent to the requirements of 10CFR50, Appendix R, Section III.G.3 for full zone suppression in an area for which alternate shutdown capability is required.

6. Zone 16-F

Two separate situations are addressed in Fire Zone 16-F. For the area at elevation 747'-6" the spot suppression system is depicted in Figure 9. This system provides coverage for the Division 1 cables in Fire Zone 16-F which will be enclosed in a 1 hour fire barrier.

For the area at elevation 727'-0" the equipment under consideration is the pump house drain sump pumps. An engineering evaluation has been completed which demonstrates that this equipment is not required to support safe shutdown. It is therefore deleted from the list of equipment required for

safe shutdown (Appendix A of June 22, 1982 submittal) and the

request for an exemption in the vicinity of this equipment is

withdrawn.

II. Boundary Exemption Requests

A. These boundary exemption requests satisfy the guidelines of the

April 20, 1982 NRC letter and no additional confirmation was

requested.

B. This exemption request pertained to the boundary between

Fire Zone 1-A and Fire Zone 1-H. An engineering evaluation has

been completed which concludes that the Division 1 cables routed

through Fire Zone 1-H and Division 2 cables routed through Fire

Zone 1-A do not provide redundant functions. Based on this

evaluation, the request for this boundary exemption is withdrawn.

C. Iowa Electric will provide a fixed fire suppression system in the

vicinity of the Division 1 cables routed near the equipment hatch

at elevation 786'-0". This suppression system is depicted in

Figures 10, 11, and 12. This system is designed to prevent

propagation of a fire through the equipment hatch from Fire Zone 2-B

to the cables in the vicinity of the hatch in Fire Zone 3-B.

-3-

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NOTES

I. a.

3. 4. 5.

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NOTES

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