ML19210E358

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Forwards Updated LER 79-016/03X-1
ML19210E358
Person / Time
Site: Millstone Dominion icon.png
Issue date: 11/27/1979
From: Opeka J
NORTHEAST UTILITIES
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19210E359 List:
References
MP-2-4204, NUDOCS 7912040396
Download: ML19210E358 (2)


Text

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flovember 27, 1979 f1P-2 4204 Mr. Boyce H. Grier Director, Region I .

Office of Inspection and Enforcement U. S. liuclear Regulatory Commission -

631 Park Avenue King of Prussia, PennsyTvania 19406

Reference:

Facility Operating License fio. DPR-65 Docket tio. 50-336 Reportable Occurrence R0-50-336/79-16/3X-1

Dear fir. Grier:

This letter forwards update Licensee Event Report 79-16/3X-1 pursuant to Millstone Unit 2 Appendix A Technical Specifications, Section 6.9.1.9.b, conditions leading to operation in a degraded mode pemitted by a limiting condition for operation. An additional three copies of the report are enclosed.

Yours truly,

?'w

. . Opeka Station Superintendent Millstone fluclear Power Station JF0/RB:llm

Attachment:

LER 79-16/3X-1 cc: Director, Office of Inspection and Enforcement, Washington, D.C. (30)

Director, Office of lianagement Information and Program Control, Washington, D.C. (3) 1473 246 7 912040 W

Attachment .

Millstone Unit 2 LER 79-16/3X-1 Docket No. 50-336 Event Description On 6/11/79, during a plant cooldown one channel of low range pressurizer pressure indication was found to be reading approximately 250 psi ~

lower than actual pressurizer pressure. The cooldown continued in accordance with technical specifications, Section 3.4.9.3, action a, and the pressure transmitter was adjusted, recalibrated and returned to service.

On 11/1/79 during another plant cooldown, the same pressure transmitt'er was found to be reading approximately 200 psi lower than actual pressurizer pressure. The cooldown continued in accordance with technical specifications Section 3.4.9.3, action a. Two defective components were replaced in the transmitter which was then recalibrated and returned to service. Total time out of service was 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />.

. Cause Description The cause of the initial low reading was a zero shift which was corrected by adjustments and recalibration. Following the second occurrence on 11/1/79, exanination of the transmitter revealed two defective components, an oscillator-amplifier (P/M 805B27403) and a bourdon tube (P/N 6288030402). Thr defective parts were replaced and the transnitter was recalibrated and returned to service. The faulty coaponent replacenent will be the final corrective action rather than coaplete transmitter replacement as stated in the original report of 7/10/79.

1473 24/

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