ML20114D194
| ML20114D194 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/11/1985 |
| From: | Counsil W, Opeka J NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| F0658A, F658A, SD-67, NUDOCS 8501310034 | |
| Download: ML20114D194 (2) | |
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(203) 66s-5000 January 11,1985 Docket No. 50-423 F0658A Dr. Thomas E. Murley Regional Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Dear Dr. Murley:
Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Design and Construction:
Improper Installation of Conduit Seal for Rosemount Pressure Transmitters (SD-67)
In a December 14, 1984 telephone conversation between your Mr. T. Rebelowski and our Mr. R. E. Lefebvre, Northeast Nuclear Energy Company (NNECO) reported a potential significant deficiency in the construction of Millstone Unit No. 3 as required by 10CFR50.55(e).
The potential significant deficiency involves four Rosemount differential pressure transmitters with improper conduit installations. The Rosemount instruction manual requires a qualified thread sealant be applied where the conduit enters the transmitter. This sealant was not used for these transmitters and is necessary to prevent moisture from accumulating into the terminal side of the transmitter housing during accident conditions. Further investigation noted that several other transmitter conduits t
l had been installed in a similar manner.
Our architect-engineer, Stone & Webster Engineering Corporation, has identified j
all Millstone Unit No. 3 instrumentation that requires a conduit entry seal.
l These conduit seals will be reworked by NNECO on a post-turnover basis and the correct seal installed. However, we are still investigating the scope of this problem and evaluating its potential generic implications.
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..- We are not able to provide you with a 1inal report at this time and will prov,de you with an update on this matter by Ma rch 14,1985.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY l0. D. Cn,~:t W. G. Counsil Senior Vice Pres'ident hd 1 -//-3f By:M. Opel4a Vice President cc:
Mr. R. C. DeYoung, Director Division of Inspection and Enforcement i
U.S. Nuclear Regulatory Commission
. Phillips Building 7920 Norfolk Avenue Bethesda, MD 20814 i
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