ML20215E793
| ML20215E793 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 10/09/1986 |
| From: | George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Noonan V Office of Nuclear Reactor Regulation |
| References | |
| SBN-1212, NUDOCS 8610150511 | |
| Download: ML20215E793 (2) | |
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George S. Thomas
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vice President-Nuclear Production t
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Pubec service of New Hampshke New Hampshire Yonkee Divlelen October 9, 1986 SBN-1212 T. F. B7.1.2 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. Vincent S. Noonan, Project Director PWR Project Directorate #5 References (a) Construction Permit CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b)
PSNH Letter (SBN-1191) dated September 12, 1986,
" Interim 10CFR50.55(e) Report: Veritrak/Tobar Transmitters (CDR-86-00-09)", J. DeVincentis to R. W. Starostecki
Subject:
Veritrak/Tobar Transmitters Dear Sir Reference (b) reported, to NRC Region I, a 10CFR50.55 (e) deficiency regarding calibration shifts in veritrak Group A transmitters resulting from variances in ambient temperature. These ambient temperature compensation shif ts could create a condition where the allowable value limit of the Seabrook Station Technical Specifications could be exceeded.
Westinghouse has completed an initial testing phase for the Group A transmitters. This testing effort failed to produce an identifiable root cause for the setpoint drift and destructive examination testing is currently underway to identify the root cause failure mechanism. As a result of the above testing effort, Westinghouse has developed a new bounding error limit for temperature compensation. Based on Westinghouse recommendations, new, more conservative, setpoints for steam generator low-low water level (17.0% to 21.6%) and low pressurizer pressure safety injection (1850 psig to 1875 psig) will be implemented.
These new setpoint changes are temporary changes only. The values are more conservative than the current Technical Specifications setpoint values and as such will not require a change to the Seabrook Station Technical Specifications. Administrative controls will be implemented by initiating temporary procedure changes to incorporate the more conservative setpoint values into existing Seabrook Station calibration and testing procedures.
These temporary procedure changes will be incorporated in accordance with existing approved Seabrook Station procedures.
8610150511 061009 O AD PDR ADOCK 05000443 D~
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P.O. Box 300 Seobrook, NH O3874. Telephone (603) 474-9521
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_ United States Nuclear Regulatory Commission October 9, 1986 Attention:
Mr. Vincent S. Noonan Page 2 i
In addition, all of the affected Veritrak-transmitters will be replaced with Rosemount transmitters.
It is expected that the Rosemount transmitters i
will be installed on or about-February 15, 1987, depending on transmitter availability and plant conditions. Once a firm schedule for installation
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is established, the necessary calculations required will be made to determine
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if changes will be required for the Seabrook Station Technical Specifications.
Any changes to the Technical Specifications that are identified at that time will be requested in the form of a license amendment.
Should you have any questions concerning this matter,.please contact Mr. Warren Hall at (603) 474-9574, extension 4046.
Very truly yours, 3
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cc: Atomic Safety and Licensing Board Service List i
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