ML20071H580

Telecopy RO 50-259/83024:on 830517,design Review of Emergency Diesel Generator Room Ventilation Sys Capabilities Revealed Design Temp Limits of Some Electrical Components May Be Exceeded.Caused by Error in Heat Dissipation Data

ML20071H580
Person / Time
Site:	Browns Ferry
Issue date:	05/18/1983
From:	Coffey J TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
RO-50-259-83024, NUDOCS 8305250402
Download: ML20071H580 (2)

Text

., .g c0 TELECOPY TO NRC

, May 18, 1983 g .

6 Y N., 1 U. S. Nuclear Regulatory Commission Region II E cp h'.

oj

j 101 Marietta Street, NW ..

Suite 3100 0 E-Atlanta, Georgia 30303 cf BFRO-50-259/83024 Reported under Technical Specification 6.7.2.a (9)

Telecony : Date: 5/18/83 Time: 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br /> Telechone : Date: 5/18/83 Time: 1145 hours0.0133 days <br />0.318 hours <br />0.00189 weeks <br />4.356725e-4 months <br /> Person Contacted: Ross Butcher Date of Occurrence: 5/17/83 Time of occurrence: 1400 Unit: common Technical Specification InvoD'-<t: 3.9.B Conditions Prior to Occurrence Unit 1 - Refuel Outage Unit 2 - Steady state at 99% power Unit 3 - Steady state at 100% power Identification and Descriotion of Occurrence e

A design review of the capabilities of the emergency diesel generator room ventialtion system revealed that they may not prevent design temperature limits of some electrical components in the room from being exceeded for certain high electrical load and high outside ambient air temperature combinations. Initial indications were that design temperature limits of some electrical components may be exceeded with an outside ambient temperature of 87 30F in the as designed ventilation configuration.

Anoarent Cause of Occurrence Apparent error in diesel-generator heat dissipation data that was originally used as the design basis for the diesel generator building ventilationn system.

Other Related Events None 8305250402 830518 A.

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> 4; TELECOPY TO MRC May 18, 1983 Corrective Action Taken or Planned It was determined from test data and calculations that an outside air temperature of 98.7oF could be accommodated if a deflector was installed in the diesel room to direct generator ventilation exhaust air away from the electrical components of concern. Af ter the potential problem was identified, deflectors were installed in all eight diesel-generator rooms before outside air temperatures exceeded 87 3oF. These deflectors will be replaced by a permanent ducting modification to route the generator ventilation exhaust air from the area of electrical components directly to the room exhaust fan suction.

C,LNwr I (on'J.A.Coffey Acting Power Plant Superintendent Browns Ferry Nuclear Plant I

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