ML20024D753

LER 83-048/03L-0:on 830624,control Area Ventilation Sys Train B Declared Inoperable Following Low Refrigerant Temp Alarm Trip of Control Room Chiller B.Caused by Cleaning of Condenser tubes.W/830727 Ltr

ML20024D753
Person / Time
Site:	McGuire
Issue date:	07/27/1983
From:	Nardoci P, Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-83-048-03L, LER-83-48-3L, NUDOCS 8308080107
Download: ML20024D753 (2)

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,2;3 I(VC) Train B was declared inoperable followine a low refrigerant tonnernturn

'3'4 ' alarm t rip of control room chiller B. This vininens T_q_1_7_r, which is report-jo.5,lable per T.S.6.9.1.11(b) and similar to R0-369/81-44. Because of redundant trainh ,

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!a!7 3lthe control room or control room area at permissible temperatures. Health and I : . 3 ! l safety of thn nublic worn unnffncena  !

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CAUSE CESCRIPTION AND CORRECTIVE ACTIONS h Ii10llThe chilled water thermostat had been adiusted lower rn offsor rhn nccumnineinn I liit jjof fouling in the condenser over a period of years. Due to an increase in con- l l t ! 2 i dl enser backpressure the condenser tubes were cleaned. Af ter this was done the l l tis ll increased heat transfer caused the refrigerant low temperature cutout switch te I g,64ll trip. The cutout switch was reset, and a procedure chance will include a step tol

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...W EI."fe lain,0. @ NaC uSE ONtv N/A l lllIll llllll l i :: o. i IC.@l yn.E op , rep 4RER Phillip B. Nardoci ,wcNE (704) 373-7432 8308080107 830727 PDR ADOCK 05000369 S PDR SG 2 O<

DUKE POWER GOMPANY USNRC Pr.

n.o. nox asiao A T!. A p' ", -J,ON I cnuu.orre, x.c. ene.m " ORGl4 HAL H. TUCKER TELEPHONE vara r.enspe=1 (704) Il73-4NB1 uu.. ""

July 27, 1983 b AUG 3 Ag ,. l Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region Il 101 Marietta Street NW, Suite 2900 Atlanta, Georgia 30303 Subj ect: McGuire Nuclear Station Units 1 and 2 Docket Nos. 50-369 and 50-370 LER/RO-369/83-48

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/83-48. This report concerns T.S. 3.7.6, "Two independent control area ventilation systems shall be operable". This incident was considered to be of no significance with respect to the health and safety of the public.

Very truly yours, Yb Hal B. Tucker

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PBN:j fw Attachment cc: Document Control Desk Records Center U. S. Nuclear Regulatory Commission Institute of Nuclear Power Operations Washington, D. C. 20555 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 Mr. W. T. Orders NRC Resident Inspector McGuire Nuclear Station

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