ML20096G836

Advises That Containment Purge Valves Able to Close Against Buildup of Containment Pressure Following Design Basis Loca. Torque Required to Overcome Stem or Packing Loads Greater than Torque Required by Flow Loading

ML20096G836
Person / Time
Site:	Catawba
Issue date:	09/05/1984
From:	Tucker H DUKE POWER CO.
To:	Adensam E, Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 8409110167
Download: ML20096G836 (2)

Text

v DUKE POWEE GOMPANY P.O. DOx 33180 CHAPLOTTE, N.o. 28242 HALB. TUCKER ten.ze.,oxa veos rar.amewr (704) 073 6531

===e===== September 5, 1984 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.'S. Nuclear Regulatory Commission Washington,'D. C. 20555 Attention: Ms. E. G. Adensam, Chief Licensing Branch No. 4 Re: Catawba Nuclear Station Docket Nos. 50-413 and 50-414

Dear Mr. Denton:

Proposed'L'icense Con'dition 18, Containment Purge Valve Operability, which was attached to Facility Opcrating License NPF-24 for Catawba Unit 1, required additional documentation in order to demonstrate the operability of valves VQ2A, VQ3B, VQ15B, and VQ16A which are shown on FSAR Figure 9.5.10-1. ,

The manufacturer (Borg-Warner) of valves VQ3B and VQ15B supplied these gate valves with Rotork electric motor operators set at 45 ft-lbs of output tor-

.que. That torque valve will close the valves against a differential pressure of at'least 375 psi. The manufacturer (Grinnell) of valves VQ2A and VQ16A supplied these diaphragm values with Rotork electric motor operators set at 45 ft-lbs of output torque. That torque va1Ye will close the valves against a differential pressure of at least 200 psi. Both manufacturer's have verified that a differential pressure of 15 psi due to containment pressure buildup will have little effect when closing the valves. At pressures this low, the. torque required to overcome stem or packing loads is greater than the torque required by flow icading. All of the operators have been field checked to verify correct torque settings.

It is therefore concluded that these valves have the ability to close against the taildup of containment pressure following a design basis LOCA.

Very truly yours, bf //}()

Hal B. Tucker ROS: sib cc: Mr. James R. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323

i t 0 8409110167 840905 PDR ADOCM 05000413 k P PDR

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.Mr. Hap id R. Dentrn Dir:ctar

5bpteecr.5, 1984 Page Two'

cc: NRC Resident Inspector Catawba Nuclear Station Mr.' Robert Guild, Es'q.

Attorney-at-Law P. O. Box 12097

. Charleston, South Carolina 29412 Palmetto. Alliance 2135 Devine Street Columbia, South Carolina- 29205 NW. Jesse L. Riley

- Carolina-Environmental Study Group

- 854,Henley Place Charlotte, North Carolina 28207 T

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