ML20198H436
| ML20198H436 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 12/24/1997 |
| From: | Polich T NRC (Affiliation Not Assigned) |
| To: | NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9801130292 | |
| Download: ML20198H436 (25) | |
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UNITO ATATE9 po f
NUCLEAR RE^ULATORY C2MMISSION
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December 24, 1997 UCENSEE:
Texas Utilities Electric Company FACILITY:
Comanche Peak Steam Electric Station, Unit 1
SUBJECT:
SUMMARY
OF MEETING WITH TEXAS UTILITIES ELECTRIC COMPANY (TUE) TO DISCUSS THE FEBRUARY 28,1997 RESPONSES TO THE NRC'S CABLE FUNCTIONALITY SAFETY EVALUATION DATED MAY 22,1996 On November 12,1997, members of the NRC staff met with representatives of Texas Utilities Ehetric Company (TUE) at the NRC O# ices to discuss the February 28,1997, responses to the May 22,1996. t die functionality safety evaluation (SE). The staff indicated that in previous correspondence, four of the seven open items in that SE were closed. The licensee presented their position or: the three remaining issues (see Attachment 1). Attachment 2 is the list of meeting attendees.
The staff acknowledged the receipt of the licensee's revised Engineering Report dated November 6,1997. However, it was noted that the report was not received in time to perform any review prior to the meeting.
l The licensee briefly described the revised response to open item 3 (Thermo-Lag fire stops) and open item 4 (silicone foam fire stops). The staff acknowledged the description but could not comment on the details of the submittal until after a technical review has been conducted.
The licensee then explained the process used to address open item 1 (enclosed thermal mass) l and thn4 data point correlations they used to predict cable tray performance. The staff indicated i
that there were some potential problems with the three point correlations proposed by the licensee and questioned why some type of confirmatory testing was not being considered.
The licensee also stated at the meeting they would reconsider their response to open item 1.
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in conclusion, the staff characterized the meeting as informative and constructive.
l Docket No. 50 445 1
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2 AddnionalInformation During subsequent phone ceNs after the meeting the licensee indicated that they would be in accordance whh the October 29,1992, crHeria. The proposed test schemes may also provide the Soonsee with addnional options for open hem 4 (sKwne foam flre stops). The licensee plans to subri* detailed test plans to the staff before the end of 1997 so that they can be reviewed by the staff.
After the staff reviews the licensee's proposed test plan further interactions betweer, the staff and TUE may be required to ensure the tests property bound the minimum fillinstallations in UnN 1.
The staff plans to observe the confirmatory testing whenever H is conducted.
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Timothy J. P ich, Project Manager Project Directorate IV 1 Division of Reactor Prclects Ill/IV office of Nuclear Reactor Regulation Attachments: 1. Licensee's Presentation
- 2. Meeting Attendees
- c. w/atts: See next page
2 AdditionalInformation outing subsequent phone cans after the meeting the licensee indicated that they would be in accordance w6th the October 29,1992, ortterie. The proposed test schemes may also provide the lloonees wlth addNional op*1ans for open Nem 4 (suloone foam fire stops). The licensee plans to submN detalloi tost plans to dw staff before the end of 1997 so that they can be reviewed by the staff.
After the staff reviews the licensee's proposed test plan further interactions between the staff and 4
TUE may be required to ensure the tests property bound the minimum fill installations in Unit 1..
- The staff plans to observe the confirmatory testing whenever N is conducted.
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i ORIGIliAL SIGilED BY:
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Timothy J. Polich, Project ":g+-
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Project Directorate IV 1 t
Division of Reactor Projects ill/IV
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1 Office of Nuclear Reactor Regulation'
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t Attachments: 1. Uconsee's Presentation
- 2. Meeting Attendees j
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oc'w/atts: See next page DISTRIBUIlON: Seee next pa9e Document Name: CP111297.MTS 4
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TU Electric Company Comanche Peak, UnNs 1 and 2 l
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Senior Resident inspector Honorable Dale McPherson U.S. Nudear Regulatory Commission County Judge P. O. Box 215e P. O. Box 851 Glen Rose, TX 76403 215e Glen Rose,TX 76043 Regional Administrator, Region IV office of the Govemor U.S. Nuclear Regulatory Commission ATTN: John Howard, Director 611 Ryan Plaza Drive, Sune 400 Environmental and Natural Artington,TX 76011 Resources Policy P. O. Box 12428 Mrs. Juanita Ellis, President Austin,TX 78711 Citizens Association for Sound Energy 1426 South Polk Arthur C. Tate, Director Dallas, TX 75224 -
Division of Compliance & Inspection Bureau of Radiation Control Mr. Roger D. Walker Texas Department of Health TU Electric 1100 West 49th Street Regulatory Affairs Manager Austin, TX 78756-318g P. O. Box 1002 Glen Rose, TX 76043 Mr. C. Lance Tony TU Electric Texas Utilities Electric Company Group Vice President !Juclear c/o Bethesda Licensing Attn: Regulatory Affairs Department 3 Metro Center, suite 810 P, O. Box 1002 Bethesda, MD 20614 Glen Rose, TX 76043 George L Edgar, Esq.
Morgan, Lewis & Bocklus 1800 M Street, N.W.
Washington, DC 20036 5869 a
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ATTACHMENT 1
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AGENDA i
i INTRODUCTION ROGEK vVALKER l
ISSUES FRED MADDEN
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ISSUES 3 and 4 FRED MADDEN
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i ISSUE 1 FRED MADDEN j
i REVIEW FRED MADDEN CONCLUSIONS FRED MADDEN
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PAGE 2 OF 16
1
-l ISSUES i
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= ENCLOSED THERMAL MASS OPEN i
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= EFFECTS OF HOSE STREAM ON BOX ASSEMBLY - CLOSED i
= THERMO-LAG FIRE STOPS OPEN SILICONE FOAM FIRE STOPS OPEN l
= USE OF SCHEME 9-3 (CONDUlTS)
CLOSED
= USE OF SCHEME 11-2 (AIR DROPS)
CLOSED
= USE OF SCHEME 15-2 (750 MCM CABLE)
CLOSED '-
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i ISSUES THREE AND FOUR l
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REVISED ENGINEERING REPORT ELIMINATES INFORMATION f
l THAT IS NOT PERTINENT TO THE TESTED CONFIGURATIONS i
~. ISSUE THREE - FIRE STOPS CONSTRUCTED WITH THERMO-LAG i
i 330-1 AND BISCO SF-60 SILICONE ELASTOMER ARE ACCEPTABLE f
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. ISSUE FOUR.- FIRE STOPS CONSTRUCTED WITH SILICONE FOAM WILL BE REWORKED AND WILL COMPLY WITH TESTED CONFIGURATION
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PAGE 4 OF 16
i ISSUE ONE 1
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. AFFECTS OF VARYING ENCLOSED THERMAL MASS ON BARRIER j
PERFORMANCE l
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SUMMARY
RESULTS OF EVALUATION l
CABLE TEMPERATURES ARE INVERSELY RELATED TO ENCLOSED THERMAL MASS l
INCREASE IN THERMAL MASS WILL DECREASE THE CABLE TEMPERATURE
= CPSES CABLES WILL REMAIN FREE FROM FIRE DAMAGE EVEN WITH EXTREME VARIATIONS IN ENCLOSED THERMAL MASS
= VARIATIONS IN TEMPERATURE PROFILES ARE PREDICTABLE
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..l TVA CABLE TRAY MODEL i
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= DATA PLOTTED i
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= LEAST-SQUARES REGRESSION ANALYSIS OF TVA DATA TO DEVELOP TEMPERATURE / ENCLOSED MASS CORRELATION i
= 86 PERCENT CORRELATION BETWEEN DATA AND "TVA MODEL" i
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..MODEL EQUATION APPLIED TO KNOWN CABLE / RACEWAY MASS i
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= PREDICTION OF AVERAGE CABLE TEMPERATURE 324 DEG. F l
= ACTUAL (TEST) AVERAGE CABLE TEMPERATURE 328 DEG. F i
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4 PAGE 8 OF 16
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l TU ELECTRIC CABLE TRAY MODEL i
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= DATA PLOTTED l
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-= LEAST-SQUARES REGRESSION ANALYSIS OF TU ELECTRIC DATA
= 99 PERCENT CORRELATION BETWEEN DATA AND "TU MODEL" i
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TU ELECTRIC CABLE TRAY MODEL PREDICTION i
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. BETWEEN THE TU ELECTRIC MODEL AND THE TVA MODEL l
THERE IS A 95 PERCENT CORRELATION OF MAXIMUM
- TEMPERATURES
= TU ELECTRIC MODEL PREDICTS CONSERVATIVE MAXIMUM TEMPERATURE l
= CPSES CABLES WILL REMAIN FREE FROM FIRE DAMAGE AT THE l
l PREDICTED MAXIMUM TEMPERATURES
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l PAGE 10 OF 16 i
CABLE TEMPERATURE vs ENCLOSED TRAY MASS MASS PERCENTAGE FILL CABLE TEMPERATURE I1 0
425 I1.7 2.2 421 12.4 4.4 417 13.1 6.6 413 13.8 8.8 409 14.5 II 405 15.2 13.2 401 15.9 15.4 397 16.6 17.6 394 173 19.8 390 18 21.9 386 18.7 24.1 382 19.4 263 378 20.1 28.5 374 20.8 30.7 370 21.5 32.9 367 I
22.2 35.1 363 j
PAGE 11 OF 16
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TVA CONDUIT MODEL i
. DATA PLOTTED i
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LEAST-SQUARES REGRESSION ANALYSIS OF TVA DATA TO DEVELOP TEMPERATURE / ENCLOSED MASS CORRELATION l
. 99 PERCENT CORRELATION BETWEEN TVA DATA AND "CONDUlT l
MODEL" i
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- CPSES CABLES WILL REMAIN FREE FROM FIRE DAMAGE AT THE j
PREDICTED MAXIMUM TEMPERATURE
= MAXIMUM TEMPERATURE LESS THAN 400 DEG. F I
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PAGE 13 OF 16
l CABLE TEMPERATURE VS ENCLOSED CONDUn~ MASS MASS PERCENTAGE FILL CABLE TEMPERATLRE 3.5 0
392 3.67 63 386 3
3.84 12.5 380 4.01 18.8 374 4.13 25 369 435 313 363 t
4.52 37.5 357 l
4.69 43.8 351 s
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PAGE 14 OF 16 i
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-i CONCLUSION I
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. EVALUATIONS BASED ON TU ELECTRIC AND TVA FIRE TESTS i
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SHOW THAT CABLES WILL BE FREE FROM FIRE DAMAGE AT PREDICTED TEMPERATURES REGARDLESS OF VARYING ENCLOSED THERMAL MASS
. 2 INCH CONDUIT AND 12 INCH CABLE TRAY BOUND LARGER l
RACEWAYS r
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PAGE 15 OF 16 i
h PROPOSED INDEPENDENT REVIEW i
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= OBJECTIVE PERFORM A TECHNICAL REVIEW OF l
THE TU ELECTRIC ENCLOSED THERMAL MASS EVALUATION i
= PROTOCOL INDEPENDENT TU ELECTRIC CONTRACT 1
REPORT i
= GOAL EXPEDITE RESOLUTION i
l PAGE 16 OF 16 J
9 MEETING ATTENDEES HBQ Qmarizatkm Eb209 T. Polich NRC/NRR/PD 41 301-415-1038
' J. Clifford NRC/NRR/PD 41 301 415 1313 U.Shoop NRC/NRR/PD 4-1 301-415 3021 L Marsh NRC/NRR/SPLB 301-415-2873 J. Calvo NRC/NRR/EELB 301-415-2774 K. S. West NRC/NRR/SPLB 301 415 1220 E. Connell NRC/NRR/SPLB 301-415 2838 R. Jenkins NRC/NRR/EELB 301-415 2985 R. Walker TU Electric 254-897-8233 F. Madden TU Electric 254-897-8601 B. Mays TU Electric 254-897 6816 J. White TU Electric 254-897-6674 O. Bhatty TU Electric 254-897-5839 G. Beckett TU Electric 254-897-8083 R. Dible DE&S/TU Electric 817 737 1155 ATTACHMENT 2 l