ML20100F269

Forwards Rev 0 of Engineering Rept ER-ME-102, Resolution of NRC GL 95-07 'Pressure Locking & Thermal Binding of Safety- Related Power-Operated Gate Valves.'

ML20100F269
Person / Time
Site:	Comanche Peak
Issue date:	02/13/1996
From:	Kelley J, Terry C TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20100F270	List: ML20100F269 ML20100F276
References
GL-95-07, GL-95-7, TXX-96046, NUDOCS 9602210023
Download: ML20100F269 (4)

Text

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_g Log # TXX 96046 lllllllll:' = File # 10035 L 4 Ref. # 10CFR50.54(f)

F g GL 95-07 1UELECTRIC

c. une. Teny February 13, 1996 Group Vice President l

U. S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, D.C. 20555 0001 ,

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) UNITS 1 AND 2 j DOCKET NUMBERS 50 445 AND 50 446 RESPONSE TO GENERIC LETTER 95 07, " PRESSURE LOCKING AND THERMAL BINDING OF SAFETY RELATED POWER OPERATED GATE VALVES" REF: 1. Generic Letter 95 07, " Pressure Locking and Thermal Binding of Safety Related Power Operated Gate Valves," dated August 17, 1995

2. TV Electric letter logged TXX-95263 from Mr. C. L. Terry to NRC dated October 16, 1995

3. TV Electric letter logged TXX 95278 from Mr. C. L. Terry to NRC dated November 6, 1995 Gentlemen:

On August 17, 1995, the NRC issued Generic Letter 95 07, " Pressure Locking and Thermal Binding of Safety Related Power Operated Gate Valves" (Reference 1).

Pursuant to Section 182a of the Atomic Energy Act of 1954, as amended, and 10 CFR 50.54(f) TV Electric committed to implement the requested actions in Generic Letter 95-07. Via Reference 3 TV Electric provided clarification to Reference 2.

as requested by the NRC.

Via this letter TV Electric is submitting under affirmation (Attachment 1) the information requested in Reference 1.

TV Electric's Engineering report ER-ME 102 (Enclosure 1) provides the results of our susceptibility evaluation and analysis of safety related power-operated gate valves. It includes a list of the susceptible valves and the planned corrective actions.

! 9602210023 960213 l PDR ADOCK 05000445 P PDR P. O. Box 1002 Glen Rose. Texas 76043

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'II

TXX 96046 Page 2 of 2 Although certain valves were determined to be susceptible to bonnet pressure locking, the operability of these valves has been justified. The aforementioned

• operability evaluations utilized the best available analytical methods to predict the additional stem thrust required to overcome pressure locking and operate these i valves. This load combined with the required pullout thrust and compared with the 3 available motor thrust capability, both from the GL 8910 program, demonstrated '

adequate margin as documented in the enclosed Engineering Report.

j It is our intention to implement the planned corrective actions for both CPSES Units by the end of the sixth refueling outage for CPSES Unit 1 (1RF06), which is  !

scheduled to start during the first quarter of 1998. However, should the ongoing industry test verification efforts demonstrate the analytical methods used at CPSES to be adequate TV Electric will rely on these methods to justify long-term operability without physical modification of the valves.

If you have any questions, please contact Obaid Bhatty at (817) 897-5839.

J l

Sincerely, j l

C. L. Terry By:

J. J. Kelley, Jr.

Vice President of Nuclear Engineering and Support 08/ob Attachment Enclosure j cc: Mr. L. J. Callan, Region IV Mr. W. D. Johnson, Region IV Mr. T. J. Polich, NRR Resident Inspectors, CPSES to TXX %046 Page 1 of 1 l UNITED STATES OF AMERICA  !

NUCLEAR REGULATORY COMMISSION ,

In the Matter of )

) ,

Texas Utilities Electric Company ) Docket Nos. 50 445

) and 50 446 (Comanche Peak Steam Electric )

Station, Units 1 & 2) )

AFFIDAVIT  !

James J. Kelley, Jr. being duly sworn, hereby deposes and says that he is the Vice President of Nuclear Engineering and Support of TV Electric, the licensee herein:

that he is duly authorized to sign and file with the Nuclear Regulatory Commission this Response to Generic Letter 95 07, " Pressure Locking and Thermal Binding of  ;

Safety Related Power Operated Gate Valves"; 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.  ;

l James J. Kelley, Jr.

Vice President of Nuclear Engineering and Support STATE OF TEXAS )

)

COUNTY OF )

Subscribed and sworn to before me, on this /d day of Iflutu,1995.

d i 4?fAMflYAW Notary P/ ublic 1

v JEAN AMUNDSON

.s .

,A- NOTARY PUBLIC g, P4 : STATE OF TEXAS My Commisson Expires 7198

i l

l l

l ENCLOSURE TO TXX-96046 l I

ENGINEERING REPORT ER-ME-102

" Resolution of NRC Generic Letter 95-07 Pressure Locking and Thermal Binding of  ;

Safety-Related Power-0perated Gate Valves"