ML20099G443
| ML20099G443 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 03/01/1985 |
| From: | Counsil W NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (SD-73), F0680A, F680A, NUDOCS 8503140563 | |
| Download: ML20099G443 (2) | |
Text
NORTHEAST IfTILITIES cener.i Omc... see n sir..i. Bornn. connecticui
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HARTFORD. CONNECTICUT 06141-0270 J C ',(( C,",~.
(203) 66s-5000 k
L March 1,1985 Docket No. 50-423 F0680A 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:
Emergency Generator Load Sequencers (SD-73)
In a January 30, 1985 telephone conversation between your Mr. T. Rebelowski and our Mr. G. M. Olsen, Northeast Nuclear Energy Company reported a potential significant deficiency in the construction of Millstone Unit No. 3 as required by 10CFR50.55(e).
The potential significant deficiency involves emergency generator load sequencers supplied by Vitro Laboratories.
During start-up testing of the Millstone Unit No. 3 emergency generator load sequencers, it was determined that certain loads were not shed as required when the diesel generator breaker was opened during sequencing in certain operational modes. Specifically, the diesel generator breaker status inputs for the following loads were omitted:
The quench spray pump, safety injection pump, and residual heat o
removal pump on a containment depressurizatior, actuation (CDA) signal concurrent with a loss of power (LOP).
The safety injection pump and residual heat removal pump on a safety o
injection signal (SIS) concurrent with a LOP.
8503140563 850301 PDR ADOCK 0500 3
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' i This is a significant deficiency for Millstone Unit No. 3. Vitro Laboratories is in i
the process of initiating corrective actions which we will implement to correct l
this significant deficiency. We will provide you with an update on this matter by I
April 30,1985.
Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY RL41/1L W. G.'Counsil Senior Vice President t
cc:
Mr. 3. M. Taylor, Director Division of Inspection and Enforcement U.S. Nuclear Regulatory Commission Phillips Building 7920 Norfolk Avenue Bethesda, MD 20814 l
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