05000336/LER-1982-011, Forwards LER 82-011/03L-0.Detailed Event Analysis Encl

Forwards LER 82-011/03L-0.Detailed Event Analysis Encl

ML20052G248
Person / Time
Site:	Millstone
Issue date:	05/05/1982
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20052G249	List: 05000336/LER-1982-011, Forwards LER 82-011/03L-0.Detailed Event Analysis Encl 05000336/LER-1982-011-03, /03L-0:on 820405,RCS Temp Dropped to 514 F.Caused by Borating to Control Xenon While Placing Turbine on-line Which Caused Power Reduction & Cooldown.Control Element Assemblies Withdrawn to Increase Power & Temp
References
MP-2-5155, NUDOCS 8205140451
Download: ML20052G248 (2)

LER-1982-011, Forwards LER 82-011/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3361982011R00 - NRC Website

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May 5, 1982 MP-2-5155 cn Mr. Ronald C. Paynes Regional Administrator, Region I

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Reference:

Facility Operating License No. DPR-65 Docket No. 50-336 4

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Reportable Occurrence R0-50-336/82-Oll/3L-0

Dear Mr. Haynes:

This letter forwards Licensee Event Report 82-11/3L-0 required to be submitted within thirty days pursuant to Millstone Unit 2 Appendix A Technical Specifications, Section 6.9.1.9.b, conditions leading to operating in a degraded mode permitted by a limiting condition for operation.

An additional three copies of the report are enclosed.

Yours truly, NORTHEAST NUCLEAR ENERGY COMPA Y p

E J. Mroczka Station Superintendent Millstone Nuclear Power Station l

EJM/JGR:mo

Attachment:

LER R0-82-ll/3L-0 Director, Office of Inspection and Enforcement, Washington, D.C. (30) cc:

Director, Office of Management Infonnation and Program Control, Washington, D.C. (3)

U. S. Nuclear Regulatory Commission, c/o Document Management Branch, Washington, D.C.

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ATTACHMENT TO LER 82-ll/3L-0 NORTHEAST NUCLEAR ENERGY COMPANY MILLSTONE NUCLEAR POWER STATION DOCKET N0. 50-336 Event Description and Cause During a plant startup with a slight positive moderator temperature coefficient the reactor operator was maintaining 8% reactor power.

Due to the burnout of Xenon, the operator was required to borate to maintain power.

Just prior to putting the turbine generator on the line, the reactor operator borated the RCS. The effects of the boration and the cooldown caused by the turbine load caused a power decrease and a further cooldown.

The results of both actions were a reactor power of 5.5% and an RCS temperature of 514 F.

The reactor operator upon seeing the reduction of temperature and power immediately inserted positive reactivity by a rod withdrawal.

RCS temperature was restored to greater than 515 F within 3 minutes.

Action to Prevent Recurrence The Operations Supervisor has instructed all operators of the necessity of being aware at all times of plant conditions and fuel operating characteristics which have an effect on reactivity control.