ML19332D950

Final & Interim Deficiency Rept CP-89-031 Re Tornado Dampers.Initially Reported on 891030.Unit 2 Tornado Dampers Will Be Inspected.Next Rept Discussing Results of Unit 2 Evaluation Will Be Submitted Prior to Unit 2 Fuel Load

ML19332D950
Person / Time
Site:	Comanche Peak
Issue date:	11/29/1989
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CP-89-031, CP-89-31, TXX-89822, NUDOCS 8912060070
Download: ML19332D950 (2)

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- - - - - -Log #.TXX-89822'

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C Ref. # 10CFR50.55(e) ~ .

RIELECTRIC  !

m November 29', 1989 ,

L 4 h;p W. J. Cablit f _ "'

Executive Vice President ; ,f

~U. S. Nuclear Regulatory Commission-Attn: Document Control Desk ji ' Washington, D. C. 20555 .

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SUBJECT:

. COMANCHE' PEAK STEAM ELECTRIC' STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446

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~TORNAD0'0AMPERS~ ~l SDAR: CP-89-031 (FINAL REPORT, UNIT 1) b .4

.(INTERIM REPORT, UNIT 2).

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r Gentlemen:

0n 0ctober 30,.1989, TV' Electric verbally notified the.NRC of. a deficiency linvolving1 tornado dampers..;After further evaluation, it has been determined

~that this-issue is not reportable for Unit I under the provisions of-

-10CFR50.55(e).

fSpecifically, nonconformance reports (NCR's) identified. two Unit I tornado dampers which could not travel .to the design full open position due to ,

interference .from'thermolag installed on ' adjacent' fire dampers. A walkdown of the remaining-Unit litornado dampers instrilled in tandem with fire dampers revealed one additional tornado damper whose travel was restricted.due to thermolag on the_ adjacent fire damper. .An additional NCR was issued for this damper.

L A calculation of the Unit I tornado venting analysis utilizing the restricted m

positions of.these three tornado dampers. indicated that the change in'the

. calculated-differential . pressures due to the as-found Unit I tornado damper .{

louver blade positions is not significant. Based on the results of this calculation, it was concluded that no adverse effect to the safe operation of Unit I would have resulted from this deficiency. ,

8912060070 891129 PDR ADOCK0500g5 s p;!i 400 North Olive Street LB81 Dallas, Texas 73201 l: , f

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I TXX-89822 November 29, 1989 Page 2 of 2 Upon resumption of the balance of' Unit 2 engineering activities, Unit 2 tornado dampers will be inspected to determine if a similar condition exists for Unit 2. - The next report discussing the results of the Unit 2 evaluation .

will be submitted' prior to Unit 2 fuel load. I L

L Sincerely, o

V t w dess4 '

William J. C hill, Jr.

CBC/smp l

l. c --Mr. R. D. Martin, Region IV l l- Resident Inspectors, CPSES (3) l l

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