ML20012E218

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Responds to Generic Ltr 89-19 Re USI A-47, Safety Implication of Control Sys in LWR Nuclear Power Plants. Util Determined That Loss of safety-related Inverters 1 or 2 Would Involve Coincidental Opening of Main Feedwater Valves
ML20012E218
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 03/19/1990
From: William Cahill
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-GTECI-A-47, REF-GTECI-SY, TASK-A-47, TASK-OR GL-89-19, TXX-90106, NUDOCS 9004020060
Download: ML20012E218 (2)


Text

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ - _ _ _ - - _ _ _ _ _ - - . _ _ _ _

,. .' . Rasubmitted with signed l~ '

Affidavit eM 3E E r.,

Log # TXX 90106 File # 10035 r r Ref. # 10CFR50.54(f) nlELECTRIC March 19, 1990

$?<$s?w$?!$l$o U. S. Nuclear Regulatory Commission Attnt Document Control Desk Washington, D. C. 20555

$UBJECT: COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50 445 AND 50-446 RESPONSE TO GENERIC LETTER 89 19 UNRESOLVED SAFETY ISSUE A 47

" SAFETY IMPLICATION OF CONTROL SYSTEMS IN LWR NUCLEAR POWER PLANTS" Gentlemen:

As required by Generic Letter 89 19 of September 20, 1989 TU Electric hereby reports that, as described in the attached evaluation, the applicable recommendations in enclosure 2 of this generic letter have been implemented on Unit 1-and are incorporated in the design criteria for Unit 2 which is presently under construction.

In the course of the review TV Electric determined that the loss of safety related inverters 1 or 2 would involve the coincidental opening of the Main feed Water (MFW) control valves in two loops while the transient in section 15.1.2 of the FSAR is based on one MFW control valve in the fully open position. An analysis which indicates that the conclusions of section 15.1.2 remain valid with two MFW control valves in the fully open position has been performed.

FSAR Section 15.1.2 and Question / Response 32.108 will be revised to reflect the new analysis by May 31. 1990.

Sincerely.

William J. Cahill, Jr.  !

By: .

?-

hbR J n W. Beck f bbk bbo 45 ytce President.

P PDC l Huclear Engineering l l

JDR/grp Attachments c - Mr. R. D. Martin, Region IV Resident Inspectors. CPSES (3) q 90 .

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400 North Olive Street LB. 81 Dallas, Texas 7$201

i Attachment 1 to TXX 90106 Page 1 of 1 .

UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of )

)

Texas Utilities Electric Company ) Docket Nos. 50 445

) 50 446 (Comanche Peak Steam Electric )

Station Units 1 & 2) )

AFFIDAVIT John W. Beck being duly sworn, hereby deposes and says that he is Vice President, Nuclear Engineering of TV Electric, the lead Applicant herein:

that he is duly authorized to sign and file with the Nuclear Regulatory Commission this response to Generic Letter 89 19: that he is familiar with the content thereof: and that the matters set forth therein are true and correct to the best of his knowledge, information and belief.

=d-JfnW. Beck V1ce President, Nuclear Engineering STATE OF TEXAS )

)

COUNTY OF )

Subscribed and sworn to before me, a Notary Public, on this M S day of W A */ O , 1990.

44 . A-Notary Public F

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