ML20094F601
| ML20094F601 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 07/30/1984 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-PT21-84-389-000 NMP2L-0115, NMP2L-115, PT21-84-389, PT21-84-389-000, NUDOCS 8408100118 | |
| Download: ML20094F601 (2) | |
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M V. N iA G A R A RUMOHAWK NIAGARA MCHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE. N.Y.13202/ TELEPHONE (315) 4741511 P
. July 30,1984 (NMP2L 0115)
Mr. R..W. Starostecki, Director U.S. Nuclear Regulatory Comission Region 15 Divisiono$.ProjectandResidentPrograms 631 Park Avenue King of Prussia, PA 19406
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Re: Nine Mile Point Ur:tt 2 Docket No. 50-410
Dear Mr. Starostecki:
Enclosed is a final report in accordance with 10CFR50.55(e) for the problem concerning linear converters furnished by Pacific Air Products Company. This problem was reported via telecon to S. Collins of your staff on February 13, 1984 and followed by an interin report dated March 8,1984.
Very truly yours, C
M Vice President s
Nuclear Engineering & Licensing GG:ja Enclosure xc: Director of In'spection.and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Project File (2) k b
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I 8408100118 840730
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PDR ADOCK 05000410 S
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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT UNIT 2 DOCKET N0. 50-410 Final Report for a Problem Concerning Linear Converters Description of the Problem The problem pertains to the linear converters supplied by Pacific Air Products Company for damper operators used in the Nine Mile Point Unit 2 diesel generator building heating, ventilation and air conditioning system. The dampers are provided with electro-hydraulic actuators. The converter unit transforms the linear (push-pull) motion of an actuator into rotary motion.
A problem concerning these linear converters was reported by Pacific Air Products to the Nuclear Regulatory Commission under 10CFR21, wherein excessive wear on the linear converters was identified.
Analysis of Safety Implications The linear converter problem is caused by improper calibration of the controls or by excessive cycling (hunting) caused by control set points for on-off operation with insufficient range. Pacific Air Products Company has investigated the effect of this problem and has concluded that the design of the subject converters is satisfactory for dampers supplied to Nine Mile Point Unit 2 because the throttling range for damper modulation is such that excessive cycling of the dampers will not occur.
Therefore, a deficiency does not exist. As a result, the criteria for reportability under 10CFR50.55(e) have not been met.
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