ML20054D805

Forwards 811020 Telcon Record Re Requirements for Class a Fire Protection Detection Sys.Fsar Section 9.5-1 Will Be Amended to Specify Detection Sys in Switchgear Rooms

ML20054D805
Person / Time
Site:	Comanche Peak
Issue date:	04/08/1982
From:	John Marshall TEXAS UTILITIES SERVICES, INC.
To:	Burwell S Office of Nuclear Reactor Regulation
References
TXX-3507, NUDOCS 8204230399
Download: ML20054D805 (4)

Text

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TEXAS UTILITIES SERVICES INC. Log # TXX-3507 e n nmm m nonu_wn .w.n :n > File # 909.5 April 8,1982

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y. RECatyEO 1 Mr. S. B. Burwell ~

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Licensing Project Manager Q U. S. Nuclear Regulatory Commission \ Irmeggfw*g@2h 8'temi Office of Nuclear Reactor Regulation rue Washington, D.C. 20555 g 8 6

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION FIRE PROTECTION OPEN ITEMS

Dear Mr. Burwell:

Attached is documentation of a telephone conversation to Greg Harrison, the previous NRC fire protection reviewer, concerning the requirements for Class "A" detection systems. In order to resolve the open item listed on page 9-1 of the SER Supplement 1, and in accordance with the above telephone conversation, Section 9.5-1 of the FSAR will be amended to specify use of Class "A" detection systems in the switchgear rooms.

Should you have additional questions, please contact me.

Sincerely,

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0. S. Marshall JSM:tls Attachment 60

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, Telephone Conversation Record page:_

TRVardaro/JRIsgro, SMMarano/048, GDWeatherford, 11 am RADiMarino, AFAhrens, OUTGOING, 462 Tiene:

November 6, 1981

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J. Marshall TNL (Dallas)

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NOV 9 1981 Answerby: ABartlik/GHarrison o(

G&H/NRC TEXAS UTllmE tERVICES INC.

(Name) Nom ero ecVICES DIV.

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Co n t ra c t No: Texas Utilities uenerating Company - G&H 11-2323-001 Subleet d i s c u s s e d: Requirement for " Class A" Detection /

Extinguishment Circuits o______________________________________________________

SUWW ARY Of* DISCUSSION. DECISIONS AND COWWITWENTS.

Background - Recently, Bob Dacko (TNL) was approached by Greg liarrison (NRC) to determine whether the fire protection system at CPSES utilites: " Class A" wiring where the detectior. system actuates the suppression system.

A. Bartlik (G&H) was subsequently contacted by B.Dacko concerning this subject and informed B.Dacko that we do not have " Class A" wiring regulation.

in the above systena nor are we required to by any specific It was unclear whether the NRC was specifically requiring " Class A" systems in these situations. TNL said they would contact the NRC on this matter.

On October 20, 1981 John Marshall (TNL) contacted Greg Harrison (NRC) and A. Bartlik (G&H) concerning the referenced subject. The conversation is summarized below:

A. Bartlik inquired - what specific guidelines are we in violation instances?

of if we do not use Class A wiring in these Greg Harrison replied' - that there were no specific guidelines but this had been requested of other plants. j John Marshall inquired whether Class A wiring would be required where the d.etection system actuates a suppression system.

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Telecon 10/20/81 11 am Greg Harrison responded " Class "A" wiring is required

• where the detection systems actuate suppression systems in areas of the plant that contain equipment or cabling essential for the safe shutdown of the plant.

John Marshall incuired if there would be any exceptions to this.

Greg Harrison replied that we could take exceptions in areas where we could provide adequate justification.

A. Bartlik then outlined specific areas of concern and provided justification for not having " Class A" wiring. Greg Harrision responded to each item of concern and gave his assessment of erch situation (this is only a generic response, an official sub-mittal of each area where we take exception must follow to obtain final approval). These areas of concern are outlined below:

1. Diesel generator day tank areas - A. Bartlik stated - Class "A" detection / extinguishment systems are not necessary in these areas because each diesel generator is separated from its redundant counterpart by two three-hour fire barriers. A fire in one day tank area would not affect the operation of the other, therefore, we can afford to have a fire in one day tank area and have its suppressior system malfunction and not jeopardize the safe shutdown of the plant.

Greg Harrison stated that he was in agreement with this position and Class "A" wirdng would not be warranted in this case. .

2. Cable spreadin room - A. Bartlik stated - A backup halon suppression system is installed in the cable spreading room (wet pipe primary system). Since this is only a backup would Class "A" wiring be warranted?

Greg Harrison stated that he felt Class "A" wiring would not be warranted for this situation.

3. Computer rooms, CAS and turbine building areas - A. Bartlik asked if Class."A" wiring would be required in these areas?

Greg Harrison responded - These are not required for the safe shutdown of the plant, therefore Class "A" wiring is not necessary.

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Telecon 10/20/81 11 am

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4. Charcoal filter units - A. Bartlik inquired whether Class A wiring was required for the detection / extinguishment circuits in these areas. _.

Greg Harrison responded - These units are not in his scope.

The fire protection requirements of these units are met provided we meet Reg. Guide 1.52.

5. Switchgear Areas - A. Bartlik stated that these areas contain both Train A and B essential cables, however, we will wrap one train with a 1-hour barrier and provide pre-action sprinkler protection in the affected cables.

Greg Harrison stated that this is an effective approach and Class A wiring may not be necessary.

Greg Harrison then left the conversation. John Marshall and A. Bartlik continued --

It was decided that it would be advisable to install a Class A detection / extinguishment system in the switchgear areas in order to avoid potential problems in the future (this area has minimal preaction sprinkler protection due to the type of electrical equip-ment in the area) .

A. Bartlik statad that he would call R. Babb to obtain his con-currence on this item prior to incorporating this change in the Alison design.

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JTMerritt LMPopplewell RB - --

JMarshall ( SI Dallas) -

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