ML19352A969

Provides Summary of Valve Qualification Efforts Resulting from NRC 790927 Effort.Valve Vendor Analysis Verified That Valve Actuator Has Sufficient Torque Capability to Overcome Forces That Resist Closure Subsequent to Design Basis LOCA

ML19352A969
Person / Time
Site:	Hatch
Issue date:	05/21/1981
From:	Beckham J GEORGIA POWER CO.
To:	NRC
References
TAC-42603, TAC-42604, TAC-51984, TAC-51985, NUDOCS 8106020449
Download: ML19352A969 (2)

Text

.,

cm a pae crcar, 333 P a rcc A + rue A' 4^*a GErg d 30 3C6

• >+10* *9 404E.26 6526

'A 'rg A r:*ess aw a..u e: ms a' ar ea 9. '<;,3 3Z2 Georgia Power May 21, 1981 Power Generation Department e..,

s

• g gt W

/h v

• h (V6. L[ '&rg

/

4, U. S. Nuclear Regulatory Commission

%vis.ecuu,n,rge JUtl 0119815 Office of Nuclear Reactor Regulation I,n' Washington, D. C.

20555 U

\\ f)/N j

- /'

MC 00CKETS 50-321, 50-366 s

CPERATING LICENSES DPR-57, NPF-5 D#

EDWIN I. HATCH NUCLEAR PLANT UNITS 1, 2 OPERABILITY ANALYSIS FOR CONTAINPENT PURGE VALVES Gentlemen:

Georgia Power Company's letter of January 9,

1980, committed to providing the Nuclear Regulatory Commission with a summary of the valve cualification efforts initiated as a result of your Septemoer 27, 1979, request.

Through our A/E, Georgia Power Company requested that the valve vendor for our 18" butterfly conta.inment purge valves analyze the operability of those valves under design basis conditions.

We have reviewed the vendor's analysis on the coerability of the containment purge valves with the valve discs pinned open at 500 The vendor's analysis verified that the valve actuator has sufficient torcue capability to overcome forces that resist closure subsequent to a design basis LOCA.

The analysis takes ini.o account:

1.

valve closure time history 2.

flow directior.

3.

single and/or double valve closure 4.

effect of upstream and/or downstream piping geometry 5.

the effects of valve disc orientation In addition, the vendor has verifie d his analysis by using data i

developed by Allis Chalmers on similar purge valves in their tests.

Our review of the operability analysis shows that it is acceDtable.

OM

.s

/0 4166620449 L

GeorgiaPower d U. S. POclear Regulatory Commission Office of Nuclear Reactor Regulation Page Two May 21, 1981 During our review of the operability analysis, we had the opportunity of reviewing the seismic analysis on the Bettis actuator for the subject valves.

Some questions had been raised regarding the resonant frequency of the actuator (the specifications required it to be greater than 20 cos).

A detailed frequency and parametric evaluation analysis for the actuator was performed.

The analysis indicates that the range of fundamental frequencies resulting from gross variation of actuator cross sectional properties is within a range of 50-70 cps, well above the design specification, confirming that the seismic analysis of the valve actuator assembly is in compliance with the specification.

J. T. Beckham, Jr. states that he is Vice President of Georgia Power Company and is authorized to execute this cath on behalf of Georgia Power Company, and that to the best of his knowledge and belle f the facts set forth in this letter are true.

GEORGIA POWER COMPANY By:

/

/J. T. Beckham, Jr.//

Sworn to and subscribed before me this 21st day of May,1981.

///

Notary Public, Georgia. State at Large b_

Mh My Commission Dpires Sept. 20.1983 Notary PuDlic RC6lr:b xc:

R. F. Rogers, III M. Manry

-