ML19312D450

Final Deficiency Rept Re Nonseismic Qualification of Control Panels for Control Room Air Conditioning Chiller Units. Chiller Control Panels Have Been Seismically Shake Tested. Chill Assembly Will Be Modified to Insure Rigidity

ML19312D450
Person / Time
Site:	North Anna
Issue date:	02/14/1980
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
NUDOCS 8003240423
Download: ML19312D450 (2)

Text

___ ____

~

". g -Q e, N'k. .rM. .itiilRiEC"rRIC AND PowEn CourAxy Rzcxxown.VruotazA 20261

'O fE4 2l Aj0

• 3 SE'ebruary 14, 1980 Mr. James P. O'Reilly, Director Serial No. 123 Cffice of Inspectica and Enforcement P0/RMT:baw U. S. Nuclear Regulatory C h asion Docket'No. 50-339 Region II Permit No. CPPR-78 101 Marietta Street, Suite-3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

Pursuant to the provisions of 10 CFR50.55(e) the NRC Region II was notified on January 16, 1980 that the control panels for the Unit 2 control room air conditioning chiller units were not qualified to Seismic Category I require-ments. The nonseismic qualification of the Unit I control panels was pre-viously. reported to the commission in LER 80-008/01T-0.

i To seismically qualify the panel internals, a shake test of one of the Unit 2

! chiller control panels was conducted at an off-site test facility. Pre-liminary results of the seismic . tests indicate that the control panels for chillers 1-HV-E-4A, B and C and 2-HV-E-4A, B and C are seismically qualified for installation at North Anna Power Station. The testing was coordinated and witnessed by Stone & Webster Engineering Mechanics and Control Systems

. Engineers and Westinghouse factory representatives.

! Because the testing was performed with the control panel installed on a rigid

( frame, several modifications are required to ensure that the chiller assembly, u as installed, is a rigid frame. This includes the removal of the four rubber

isolation' pads presently under the base of the water chiller and substituting them with metal base plates or shims and installing grout to maintain the existing

, nuit base elevation. In addition, it is necessary to disconnect a "Cuardistor" relay from the chiller control circuit, which is a product feature designed to provide additional motor overload protection. This action will require a t modification to the chiller control wiring circuit. Since normal motor l overload protection is supplied 'with the chiller unit; chiller control circuit reliability will be increased by this particular modification. The afore-mentioned changes will be completed prior to initial fuel loading of Unit 2.

30/7 sE

//o 3., .. , 4 8oosu4oqg3

l.

Lc ;6

g-Vanoim Es.scTaic on Powra Counn To Mr. ' James P. O'Reilly 2

This report-constitutes'our final. correspondence on this matter. Should you require any.further information, please contact this office.

Very truly yours, .

h. i ? ,)k!(bu.,. .

C. M. Stallings.

Vice President-Power Supply.

and Production . Operations

'cc:-- Mr. Victor Stello, Director Of fice of Inspection and Enforcement -

Mr. Harold R. Denton, Director '

Office of Nuclear Reactor-Regulation ,

'4 s

t l --

f-i t.

- a

'_ [

5 9

- - x -