ML19321A500
| ML19321A500 | |
| Person / Time | |
|---|---|
| Site: | Hartsville  |
| Issue date: | 07/18/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | |
| References | |
| NUDOCS 8007230528 | |
| Download: ML19321A500 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374o1 400 Chestnut Street Tower II 1
July 18, 1980 1
Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Cosmission Region II - Suite 3100 101 Marietta Street Atlanta, Georgia 30303 i
Dear Mr. O'Reilly HARTSVILLE NUCLEAR PLANT - REPORTABLE DEFICIENCY - HEATERS OMITTED FRCH MOTOR OPERATOR Initial notification of the subject deficiency was made to NRC-OIE, Inspector R. W. Wright, on June 18, 1980. In compliance with paragraph 50.55(e) of 10 CFR Part 50, enclosed is the final report of the subject deficiency. If you have any questivas, please call Jim Domer at FTS 357-2014.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc: Mr. Victor Stallo, Director (Enclosure)
Office of Inspection end Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 of9 Mt280513 Si i An Ecual Occortunity Employer 2
.v ENCLOSURE HARTSVILLE NUCLEAR PLANT UNIT A-1 HEATERS OMITTED FR0ti MOTOR OPERATOR 10CFR50.55(e)
NCR HNP A-097 REPORT "0.1 (FINAL)
On June 18, 1980, TVA informed NRC-0IE Region II Inspector R. W. Wright of a potentially reportable condition under 10CFR50.55(el regarding the omission of a heater from a motor operator manufactured by Reliance Elec+ric Company, Cleveland, Ohio. This is the final report on this deficiency.
Description of Deficiency The reactor core isolation cooling (RCIC) turbine team inlet valve (Limitorque) utilizes a de motor operator manufactured by Reltance.
This equipment was supplied by Terry Steam Turbine Company, Windsor, Connecticut. The motor specification requires that a permanent heater be installed. The purpose of the heater is to prevent condensation from forming inside the motor. As a part of preventive maintenance, the heaters were to be energized while the motors were in storage to prevent the motor from being damaged by water. However, one heater failed to energize.
As a result, the motor was disasserbled and it was discovered that the motor had no heating element installed.
This type of motor is utilized on one RCIC turbine steam inlet valve per unit (total of four). The deficient motor was assigned to unit A1. The other three motors have been examined and it has been verified that the heaters were properly installed in the remaining components.
Two similar units are at Phipps Bend huclear Plant (one per unit). These will be examined to verify that the appropriate heaters have been installed.
Safety Imolications The RCIC turbine steam inlet valve is normally closed and is opened only when the e' actor is isolated from the main condensers.
Wher. the valve is open, stea.1 is routed to the RCIC turbine which is used to drive the RC1 pump in nerer to provide sufficient water for core cooling during shutdown.
If water were to form inside the motor in sufficient quantities to cause a short circuit upon energizing the motor, the valve would be rendered inoperable.
Therefore, the RCIC system would be disabled.
During plant shutdown (with reactor '.solated) or a rod drop accident, this situation would lead to insufficient water in the core and initiation of Emergency Core Cooling Systems (ECCS). The RCIC is not an essential requirement for safe shutdown of the plant. However, since RCIC is the preferred mode of-cooling, its loss reduces the plant's safety margin and could lead to an abnormal plant condition which might affect plant safety.
Corrective Action The deficient motor will be replaced. TVA anticipates that the motor will be replaced by November 30, 1980.
GE, who 1.s responsible for administration of the contract for the purchase of the subject equipment, will review the vendor QA program to provide assurance that it is being properly implemented.
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