ML20141A860

Forwards RAI Re GL 92-08, Thermo-Lag 330-1 Fire Barriers. NRC Staff Reviewed & Identified Number of Open Issues & Concerns Requiring Clarification

ML20141A860
Person / Time
Site:	South Texas
Issue date:	05/12/1997
From:	Alexion T NRC (Affiliation Not Assigned)
To:	Cottle W HOUSTON LIGHTING & POWER CO.
Shared Package
ML20140G575	List: ML20140G572 ML20141A860
References
GL-92-08, GL-92-8, TAC-M82809, NUDOCS 9705150031
Download: ML20141A860 (5)

Text

? .;.

May 12, 1997

~ Mr. William T. Cottle Executive Vice-President &

General Manager, Nuclear Houston Lighting & Power Company South Texas Project Electric Generating Station P. O. Box 289 Wadsworth, TX 77483

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING THERM 0-LAG RELATED AMPACITY DERATING ISSUES, SOUTH TEXAS PROJECT, UNITS 1 AND 2 (TAC N0. M82809)

Dear Mr. Cottle:

By letter dated November 6, 1996, Houston Lighting & Power Company (HL&P) responded to the Nuclear Regulatory Commission's (NRC's) RAI related to Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers." The NRC staff, in conjunction with its contractor, Sandia National Laboratories, has reviewed the November 6,1996, letter and has identified a number of open issues and concerns requiring clarification (enclosed).

It is requested that HL&P provide the additional information requested in the enclosure within 60 days from the date of this letter.

Sincerely, Orig. si Thomas W.gned byAlexion, Project Mananer Project Directorate IV-1 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket Nos. 50-498 and 50-499 j l

Enclosure:

Request For Additional Information ,

1 cc w/ encl: See next page DISTRIBUTION:

Docket File- PUBLIC PD4-1 r/f JRoe EAdensam (EGAl) WBeckner \ l CHawes TAlexion MPSiemien, 0GC, (MPS) \r l PGwynn, RIV l Document Name: STP82809.LTR 7 0FC Pti/db-LA/PD4-1 NAME TAleN/O CHawesMt //

DATE 574/97 1 9 /97 @gM@g3gg '

COPY YENN0 YES/N0 OFFICIAL RECORD COPY 1400M l

9705150031 970512  ;

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May 9,1997 Mr. William T. Cottle Executive Vice-President &

General Manager, Nuclear Houston Lighting & Power Company South Texas Project Electric Generating Station P. O. Box 289 Wadsworth, TX 77483

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING THERM 0-LAG RELATED AMPACITY DERATING ISSUES, SOUTH TEXAS PROJECT, UNITS 1 AND 2 (TAC NO. M82809)

Dear Mr. Cottle:

By letter dated November 6, 1996, Houston Lighting & Power Company (HL&P) responded to the Nuclear Regulatory Commission's (NRC's) RAI related to Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers." The NRC staff, in conjunction with its contractor, .Sandia National Laboratories, has reviewed the November 6, 1996, letter and has identified a number of open issues and concerns requiring clarification (enclosed).

It is requested that HL&P provide the additional information requested in the enclosure within 60 days from the date of this letter.

Sincerely, I .

&W 1 W Thomas W. Alexion, Projec Manager Project Directorate IV-1 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket Nos. 50-498 and 50-499

Enclosure:

Request For Additional Information cc w/ enc 1: See next page

Mr. William T. Cottle Houston Lighting & Power Company South Texas, Units 1 & 2 cc:

Mr. David P. Loveless Jack R. Newman, Esq.

Senior Resident Inspector Morgan, Lewis & Bockius .

U.S. Nuclear Regulatory Commission 1800 M Street, N.W.

P. O. Box 910 Washington, DC 20036-5869 Bay City, TX 77414 Mr. Lawrence E. Martin Mr. J. C. Lanier/M. B. Lee General Manager, Nuclear Assurance Licensing City of Austin Houston Lighting and Power Company Electric Utility Department P. O. Box 289 721 Barton Springs Road Wadsworth, TX 77483 Austin, TX 78704 Rufus S. Scott Mr. M. T. Hardt Associate General Counsel Mr. W. C. Gunst Houston Lighting and Power Company City Public Service Board P. O. Box 61867 P. O. Box 1771 Houston, TX 77208 San Antonio, TX 78296 Joseph R. Egan, Esq.

Mr. G. E. Vaughn/C. A. Johnson Egan & Associates, P.C.

Central Power and Light Company 2300 N Street, N.W.

P. O. Box 289 Washington, DC 20037 Mail Code: N5012 Wadsworth, TX 74483 Office of the Governor ATTN: Andy Barrett, Director INP0 Environmental Policy Records Center P. O. Box 12428 700 Galleria Parkway Austin, TX 78711 Atlanta, GA 30339-3064 Arthur C. Tate, Director 4 Regional Administrator, Region IV Division of Compliance & Inspection I U.S. Nuclear Regulatory Commission Bureau of Radiation Control 611 Ryan Plaza Drive, Suite 400 Texas Department of Health Arlington, TX 76011 1100 West 49th Street Austin, TX 78756 Dr. Bertram Wolfe '

15453 Via Vaquero Texas Public Utility Commission Monte Sereno, CA 95030 ATTN: Mr. Glenn W. Dishong 7800 Shoal Creek Blvd.

Judge, Matagorda County Suite 400N Matagorda County Courthouse Austin, TX 78757-1024 1700 Seventh Street Bay City, TX 77414

/'

1.

C REQUEST FOR ADDITIONAL INFORMATION  !

i L SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION  ;

! THERM 0-LAG ARPACITY DERATING ISSUES (TAC N0. M82809) l

.l 4

Sandia. Nation'al Laboratories (SNL) finds that the current South Texas Project Electric-Generating Station (STPEGS) ampacity analysis has adequately ,

demonstrated acceptable ampacity loads for the majority of the licensee's

applications at STPEGS, Units 1 and 2. t c .

. However, the licensee has apparently identified a total of 24' cable trays (13  !

trays for STPEGS, Unit 1 and 11 trays for STPEGS, Unit 2) that did not pass j the " Step 1 Ampacity Analysis," as described by its November 6 1996,  !

.. submittal. For these 24 trays, the licensee has performed 'a " Step 2 Heat ,

Analysis." Based on the information provided by November 6, 1996, licensee

submittal, SNL concluded that the " Watts per foot" methodology has been applied in the " Step 2 Heat Analysis." Based on earlier reviews associated i with other licensees (e.g., Palo Verde), SNL has concluded that the " Watts per j- . foot" methodology is fundamentally incapable of providing an adequate

assessment of the performance limits of individual cables. Therefore, SNL

, finds that the licensee's apparent application of the subject methodology to be' inappropriate and. unclear.- .;

7 The basis for the subject finding by SNL is discussed in Section 2.5 of the '

SNL Letter Report dated April 24, 1997 (Attachment 1(a)]. The licensee is requested to consider an alternate technical basis for the assessment of the 24 cable trays' that were judged acceptable on the basis of its " Watts per i foot" methodology or alternately, to address SNL's findings, as well as other staff concerns (see section below) regarding the application of the subject methodology.

STAFF CONCERNS REGARDING " WATTS PER FOOT" METHODOLOGY

1. Experimental Validation of the Methodology l

What test data supports and demonstrates the appropriateness of this approach?

2. . Cable Loading Effects i In general, the " Watts per foot" methodology provides an inadequate i treatment of the impact of cable loading on the allowable heat loads and 2

assumes.those. effects are largely irrelevant to the overall heat i rejection capacity of the cable tray or conduit system.

" ENCLOSURE t

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3. Cable Diversity Effects .

See SNL's discussion.in Section 2.5 of the-SNL Letter Report dated .

April 24,-1997 [ Attachment 1(a)). j l

2

- Attachment 1(a): Letter report to U.S. NRC, Rev. O, dated April 24, 1997, '

prepared by Steve Nowlen of Sandia National Laboratories '

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