ML20096F898
| ML20096F898 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/29/1984 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Martin T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NMP-9315, NUDOCS 8409100255 | |
| Download: ML20096F898 (2) | |
Text
{{#Wiki_filter:y,4 Y ;* ~ M Y NIAGARA ~ R U MAM NMP-9315 NIAGARA MOHAWK POWER CORPORATION /3N ' 91E BOULEVARD WEST. SYRACUSE, N.Y.13202/ TELEPHONE (315) 474-1511 August 29, 1984 Mr. Thomas T. Martin, Director Division of Engineering and Technical Programs United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia,.PA 19406 Re: Docket No. 50-220 Inspection Report 84-10
Dear Mr. Martin:
This refers to the routine inspection conducted by Mr. James Hawxhurst of your staff on June 11-15, 1984, at Nine Mile Point Unit #1, Scriba, New York of activities authorized by NRC License No. DPR-63, and to the discussions of your findings held by Mr. Hawxhurst with Mr. T. J. Perkins of our staff at the conclusion of the inspection. ITEM A The environmental surveillance requirements (3.1) for meteorological monitoring states in part: '"Tae meteorological monitoring system shall measure parameters as prescribed by Table 3.1-1..." Table 3.1-1 indicates the accuracy requirements for the temperature difference measurements, as 0.2F' (at 200-27 feet). Contrary to the above on October 13, 1983 and April 14, 1984 (the last two semi-annual calibrations); temperature dif ferences at 200-27 feet deviated by -1.29F' and +1.45F' respectively, which greatly exceeded the above requirements.
RESPONSE
The last two consecutive Site Meteorological Temperature / Delta Temperature calibrations have resulted in reportable findings (ie-delta temperature read- .ings were greater than 0.2F*). The records for these calibrations have been examined and the following findings have been identified as probable cavies of the calibration errors. This calibration is performed using simultaneous sensor immersion (Base and Delta Temperature sensors) in ice and warm baths, respectively. 8409100255 840829 DR ADOCK 05000 Ag ,i\\/Rt i
- ~ Mr.sThoman T. Martin-f3 (Page TVo : s August. 29, 1984' ~ 2The equipment 1. manufacturer,;TeledynelGeotech was contacted-to assist in <the: investigation of.the problem. One item-the manufacturer recommended I, . checking was the stability;of the calibration heat sinks ~ (baths). Instability of.the warm bath has been~ identified as the major ~cause of the
- calibration errors' i As a-result,' inaccurate-calibration results were obtained.
W The calibration method has been examined to determine and. insure its prudency.. -In response to findings,-_the procedure has been revised to insure that the
- stability of_the. warm bath is adequately maintained'to prevent recurrences.
'Also, the procedure has been revised to clarify-the collection of data and- ' identification of' values which have' exceeded acceptable limits. Personne1' ,~ involved-with theiactivity-have.been_ reinstructed as to the importance of iconsistent work, practices'and data collection. i. [As of-this'date,.other factors =which represent potential sources for ! calibration errors have been or are.being studied and evaluated to determine -their significance. Subsequent reports will be written should any of these factors.be found to have significant effect-on the calibration (s). The procedura1Emethod prescribed for the' calibration has been tested by'the per-iformance of a calibration /recalibration. The second performance of this procedure produced acceptable, in-tolerance "as found" results. LIn[ addition, consideration;is being ~ given to the adequacy of the calibration - apparatus (test equipment)-as well as the.long term stability of the hard-f' ware. - Procedural changes will be made as necessary, should the need arise 'R 1as a result of the' actions taken thus far or in the future. The adequacy of-the corrective actions will-be verified. by the normal, full calibration to be performed ~in October 1984. It is~ believed that complete resolution of this 3 violation.and compliance'with the Technical Specifications will be achieved 3 by that date.- y As per 'the telephone conversation between Mr. T. Chwalek of our staff and Mr.;J. Hawxhurst of_your staff on AugustL28, 1984, the response concerning
- Appendix B items-is being formulated and will be forwarded to you by October'1, 1984.
s Very truly yours, 16-Vice President Nuclear Engineering &- Licensing RGR/jkr : g a \\ r i P v-g ' g,. o %.* .-+a,yw%--+-r.--h.y, +m .-,,,e--.~,,,e., 4m--.,,-,m 1~-~.. v r. -wr. e, vww--, < - -. * .--*v--- -m =}}