ML19241A916

Forwards Design Info Re Specific Fire Protection Mods 90 Days Prior to Actual Implementation,As Requested in 790523 Fire Protection Safety Evaluation

ML19241A916
Person / Time
Site:	Cooper
Issue date:	06/28/1979
From:	Pilant J NEBRASKA PUBLIC POWER DISTRICT
To:	Ippolito T Office of Nuclear Reactor Regulation
References
NUDOCS 7907110424
Download: ML19241A916 (6)

Text

i GENE R AL OFFICE P O. Bo x 499. C OL U V BUS. N E B A A$d A 68601 1 Nebraska Pubh.c Power D. is trict rete -o~e < on se o.sei

> == =. =- : =__=2w a x c :-._2 = _ -= r_ -=== u :w= meegx=- == == ===an June 28, 1979 Director, Nuclear Reactor Regulation Attention: Mr. Thomas A. Ippolito, Chief Operating Reactors Branch No. 3 Division of Operating Reactors L'.S. Nuclear Regulatory Cammissien

'.s'a s h i n g t o n , DC 20555

Subject:

Fire Protection Modifications Cooper Nuclear Statien NRC Docket No. 50-298, DPR-40

Dear Mr. Ippelito:

Ehe Fire Protection Safety Evaluation Report (CER) for Cooper Nuclear Station, issued May 23, 19 79, request ed that Nebraska Public Power District provide design information regsrding specific fire protection modifications 90 days prior to actual impleme-tation. in response to tais request enclosed please find summaries the following;

.'linor Design Enclosure Char.ge No. .S ubj e c t 1 77-15-V Sprinkler Protection for Cable Chase in Turbine Generator Building (~;rresponus to SER section 3.0, item 3.6) 2 79 -10 Fire Pump Discharge Header Isolation Valve (corresponds to SER section 3.0, item 3.27) 3 79-13 Fixed Foam Fire Protection and Wet Pipe Sprinkler Systems for Diesel-Driven Fire Pump (corresponds to SER section 3.0, item 3. 3.1)

Since the complete design change packagee may contain information of special intetest to the actual reviewers, two copies of the complete desien chan,e packages are being forwarded to Mr. Robert T. Dodds,

,uclear Regulatory Ccmmission, Region V. The complete design change packages are also available at Cooper Nuclear Station for revieu.

V Design chances77-154' and 79-10 are either complete or partially com- g6 plated at this time, therefore, the:. cannot be submitted f or review prior to implementation. '

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7007110' - '

Mr. shamas A. Ippolito

.une 28, 1979 Fa ;e 2 The Staff's prompt notification . any comments, or lacc af comments, regarding the enclosed =cdifications will be most helpful in meeting the implerentation schedule established in the SER. If no response is received from the Staff within t!'> specified 90 2:. peried, the District will proceed with implementation of the moufficatiens. :;o Tecnnical Specification changes are required in conjunction with the three enclosed design chan.;es.

If you have any questicas or regt. ire additional inf ormation, please do not hesitate to ccitact me.

Sincerely, e --

YV( s

. /11 ant Director of Licensi_g and Quality Assurance JDW/cmk Enclesures cc: Mr. Robert T. Dodds

'uclear Regulatory Commission, " :gion V Office of laspection and Enforc ment 1990 Calif ornia 3eulevard, suite 202

.alnut Creek, CA 94596 l). a , ,

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n 5 Summary of MDC 77-15-V Sprinkler Ptatection for Cable Chase in Turbine Generator Buildine I. DESCRIPTICN This MDC is written to provide autcmatic wet pipe sprinkler protection for the electrical cable chase in the turbine generator building.

This chase is bounded by column lines G&H, lies just north of column line Ib and exists for two stories above the 903' elevation. 3esides covering the horizontal and vertical cable trays in the cable chase one sprinkler is being placed over the suspended ceiling at the top of the Document Storage Room stairs. Three additional heads are also being placed over the trays at the east end of the chase.

This MIC requires more annunciation sindows than are currently available in the existing panels in t.h e control room. A new annunciator panel will therefore be added under this design change.

The new annunciator panel to be added in the control room fire panel will be RIS Type AN-100, 36 point solid state V;.;ual Annunciator System with all points active. This will match the existing equipment presently installed in the control room. The entire integral annunciat -r will be mounted in a custom steel enclosure 16" high which mounts on 6 -" of the existing panel. Access to the logic and input te rminals s h a l .; be via a plate on the rear of the inclosure which may be unbolted when access is needed.

The installation of the new panel will require installing 16 j umpers between the existing panel and the new panel, running 125tTC power through new fuse blocks to the panel, and installing an a ux ilia ry electrical device.

II. JU3TIFICATION This cable chase contains many cables which are important for safe and efficient operation of the station and ther7 fore should be protected by an approved fire protection system. The NELPIA Property Damage Inspection report dated January 2, 1976, r e c o =., e n d s ' i n their item No. 76-1 that this protection be provided. Their original

' recommendation was that an automatic zoned open head, water spray sprinkler system actuated by approved products-of-ccmbustion type detector be provided, but af ter consu' tation with the District's fire protection engineer and further work with the VELP: A representatives ,

(naw American Muclear Insurers) it was determined that a closed head wet pipe automatic sprinkler system would be preferable and it has therefore been designed that way The wet pipe system will cost less, require less naintenance because of its simplicity and be more reliable than the original YELPIA System and it should g 4.v e more positive actuation since it will not be as subj ect to the ut. usual air currents which may occur in this area.

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,, i Page 2 of 2 The single sprinkler placed over the document storage room was recently requested by ANI. By installing this head AI t ill drop the re ;uirement that the new b.ock wall between the Document Storage Room and the cable chase Le extended to the ceiling. The additional sprinklers over the east end will provide coverage to the fev remaining unprotected cables in this area which contirue on 'nto the cable spreading room.

The cable trays being protected contain cables associated with the systems listed below.

Cable Designations Annunciators Instrument Transmitters Computer DC Power - Divisions I & II (Essential)

Fee Nater Centrol System Control Drive & 'eactor ?!anual Control System Main and Au.xil: ery Trans f ormers Turbine Switchyard Unit 1 Diesel Generator Divisions I & II (Essential) 430 V Substation 1A - Division I 480 V Substation 13 - Division II 4160 V Switchgear I A - ' J7ision I 4160 V Switchgear IB u_ ision II 4160 V Switchgear 1C - Division I 4160 V Switchgear ID - Division II 4160 V Switchgear IE - Divison I & II 460 V Motor Control Center A - Division I

. 460 " Motor Control Center C - Division I 460 s Motor Control Center F - Division II 4160 V Critical Switchgea r 1G - Divisions I & II (Essential)

The only calculations required are the load analysis for the piping hangers, an clertrical circuit load anal,* sis and a seismic analysis o f the fire protection cabinet in the Centrol Roca. Copies are attache i at the end of the MDC.

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Su==ary of

'DC 79-010 Fire Pump Discharae Header Isolation Valve I. DESCRIPTION This SCC describes the method for installing an isolation valve in the fire pump discharge hecder. This will allow for en alternate flow path in the unlikely event of a single break in this header.

II. JUSTIFICATICN In the event a single break occurs en the fire pump discharge header, there is no means provided at present to split the header and still provide a ficw path from the fire pumps to pressurize the fire protection system. This fire protection system addition will provide the required isolation valve to prevent the complete loss of the fire protection system.

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