ML19327B100

Special Rept:On 890620 & 26,temp in Diesel Generator 1A & 1B Control Room Found Above Tech Spec Limit of 104 F Greater than 8 H.Caused by Heat Generated Inside Bldg,High Outside Ambient Temp & Insufficient Ventilation

ML19327B100
Person / Time
Site:	River Bend
Issue date:	10/16/1989
From:	Booker J GULF STATES UTILITIES CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RBG-31627, NUDOCS 8910250196
Download: ML19327B100 (3)

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44p, .y , ' , j October 16, 1989.  !

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RBG '31627 File Nos. 09.5, G9.25.1.4 , ,

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' ' .I Gentlemen .- I

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, River Bend Station sUnit 1 .

Docket No. 50-458

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~ t L Enclosed ' is Gulf ' States Utilities Company's ~Special Report. -l A ,

concerning diesel generator control room temperature in excess of .{

x>,w: 1 the limits lof' Technical Specification 3.7.8 forl greater.than  !

. _ .1 Jeightr, hours. This supplemental- report is being submitted I

R>f  : pursuant to River Bend Technical; Specification 3.7.8. i y .

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, Sincerely, ,

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m- J. E. Booker  ;

T- Manager-River Bend Oversight i L' -

River Bend Nuclear Group

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C l,- B/.FP/ HM/ ch 8 cer. U.:S.-Nuclear Regulatory Commission ,

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l, g/F 3, 611 Ryan Plaza Drive,' Suite 1000 -

tArlington, TX 76011

,f i i j W NRC~ Resident Inspector 5' n ' ' Post Office Box 1051 ,

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', 0910250196 891016

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gDR ADOCX 05000458 PNU

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I SPECIAL REPORT f

REPORTED CONDITION As identified in CSU's Special Report dated 7/19/89 (RBG-31263), at  !

approximately 0135 hours0.00156 days <br />0.0375 hours <br />2.232143e-4 weeks <br />5.13675e-5 months <br /> on 6/20/89, temperature in the diesel generator IB control room was identified as above the Technical Specification (3/4.7.8) limit of 104'F for greater than eight hours. The diesel generator IB control room ' temperature returned within the Technical Specification limit on l 6/21/89. At approximately 0215 hours0.00249 days <br />0.0597 hours <br />3.554894e-4 weeks <br />8.18075e-5 months <br /> on 6/26/89, temperature in the diesel '

generator IA and IB control rooms were again identified as above the 104'F for greater than eight '

Technical Specification (3/4.7.8) limit of hours. The temperature excursions were noted during the performance of STP-000-0001, " Daily Operating Logs". This supplemental report provides the

• record peak temperature in the diesel generator control rooms for 9/15/89 through 10/13/89. Due to milder outside ambient temperatures, the diesel generator control room temperatures were at or below the Technical Specification limit during much of the reporting period. Supplemental reports will continue until the temperatures are continuously within the Technical Specification limit.

INVESTIGATION The following table shows the peak temperature recorded daily during the performance of STP-000-0001 from 9/15/89 through 10/13/89. .;

DATE DGIA CONTROL ROOM TEMP ('F) DCIB CONTROL ROOM TEMP (*F) 9/15/89 107 108 9/16/89 108 107 9/17/89 105 107 9/18/89 104 106 9/19/89 104 107 9/20/89 104 106 9/21/89 104 107 9/22/89 100 108 9/23/89 102 108 9/24/89 99 102 9/25/89 100 102 9/26/89 99 100 9/27/89 100 103 9/28/89 100 102 <

9/29/89 100 103 9/30/89 99 102 10/01/89 98 101 10/02/89 100 103 1C/03/89 102 105 10/04/89 102 105 10/05/89 102 105 10/06/89 104 106 10/07/89 104 107 Page 1 of 2

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DATE DCI A CONTROL ROOM TEMP (*F) DGlB CONTROL ROOM TEMP ('F) y,.s-10/08/89 105 107 g' 10/09/89' .102 105 E 10/10/89 100' 99 f' , ' *

'10/11/89 100 102 10/12/89- 101 103 e 10/13/89 101 103 L

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' ANALYSIS AND CORRECTIVE ACTION I

The. apparent' cause of the . elevated temperatures is a combination of heat c generated inside the building by the stsadby df.esel generator " Keep Warm" e system, high outside ambient temper, cures, and insufficient ventilation in

1 the diesel engine room due to undersizing of the engine room's normal exhaust fans. A modification request has been prepared to increase the capacity of-the engine room normal exhaust fan.

The elevated temperatures has no effect on the operability of safety-related equipment located in the diesel generator control room. The diesel generator-control room is a mild environment as defined in 10CFR50.49(c)(iii), and as

, such, is excluded from the final rule on environmental qualifications.

Safety-related equipment located within the diesel generator control rooms which has been identified to be susceptible to'sicnificant thermal aging mechanisms (e.g., Agastat relays) are periodica11, replaced under an

y. equipment qualification preventive maintenance task to ensure operability of the equipment. Temperaturea in the diesel generator control room continue to exceed the limits of Technical Specification 3.7.8 on a periodic basis. A supplemental report will be provided each 30 days to provide the recorded temperatures until the diesel generator control room temperatures are continuously within the Technical Specification limit.

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