05000219/LER-1982-060, Forwards LER 82-060/03L-0.Detailed Event Analysis Encl

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Forwards LER 82-060/03L-0.Detailed Event Analysis Encl
ML20083M349
Person / Time
Site: Oyster Creek
Issue date: 01/11/1983
From: Fiedler P
GENERAL PUBLIC UTILITIES CORP.
To: Haynes R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20083M351 List:
References
NUDOCS 8302010145
Download: ML20083M349 (3)


LER-2082-060, Forwards LER 82-060/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
2192082060R00 - NRC Website

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- GPU Nuclear g gf P.O. Box 388 Forked River, New Jersey 08731 669-693-6000 Writer's Direct Dial Number:

January 11, 1983 Mr. Ronald C. Haynes, Administrator Ref; ion I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Mr. Haynes:

Subj ect: Oyster Creek Nuclear Generating Station Doeket No. 50-219 Licensee Event Report Reportable Occurrence No. 50-219/82-60/03L This letter forwards three copies of a Licensee Event Report (LER) to report Reportable Occurrence No. 50-219/82-60/03L in compliance with paragraph 6.9.2.t.3 of the Technical Specifications.

Very truly yours,

[ 2 PN Pete'r B. Fiedler Vice President and Director Oyster Creek PBF:lse Enciosures cc: Director (40 copies)

Of fice of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 t

Director (3)

Of fice of Management Information and Program Control l

( U.S. Nuclear Regulatory Commission Washington, D.C. 20555 NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, NJ 08731 l

8302010145 830111 PDR ADOCK 05000219 S PDR l

GPU Nuclear is a part of the General Public Utilities System M

OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 i Licensee Event Report i Reportable Occurrence No. 50-219/82-60/03L Report Date January 11, 1983 Occurrence Date December 10, 1982 Identification of Occurrence Less than the minimum required number of Intermediate Range Monitor (IRM) channels were operational (in one trip system) with the reactor mode switch in the " refuel" position, as required by Technical Specifications, Table 3.1.1, 4

Sections A.9 and K.6.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b.3.

s Conditions Prior to Occurrence The plant was shutdown.

Mode Switch Position: Shutdown Description of Occurrence On Friday, December 10,1982 at 0213 hours0.00247 days <br />0.0592 hours <br />3.521825e-4 weeks <br />8.10465e-5 months <br />, the reactor was shutdown by placing the reactor mode switch in " shutdown".When the reactor mode switch is placed in or removed from the " shutdown" position a reactor scram occurs. Also, a rod block is inserted in the " shutdown" mode. When the reactor scrammed by placing the mode switch in " shutdown",19 of the control rods inserted only to the "02" position. In order to fully insert the control rods the reactor mode switch was placed in the " refuel" mode at 0227 hours0.00263 days <br />0.0631 hours <br />3.753307e-4 weeks <br />8.63735e-5 months <br />. The resultant scram fully inserted all the control rods.

At 1806 hours0.0209 days <br />0.502 hours <br />0.00299 weeks <br />6.87183e-4 months <br />, an administrative rod bleek was established preventing control rod withdrawal while in the " refuel" mode. No rod movement occurred between the time the reactor mode switch was placed in " refuel" and the administrative rod block was ef fected. On Saturday, December 11,1982 at 1136 hours0.0131 days <br />0.316 hours <br />0.00188 weeks <br />4.32248e-4 months <br />, IRM Channel 17 was returned to service following replacement of its preamplifier and successful completion of "IRM Front Panel Test and Calibration" procedure.

Technical Specifications, Table 3.1.1 requires three IRM channels in each trip system to be operable when the reactor mode switch is in " refuel". IRM Channels 16 and 17 which are both in the same trip system, were considered to be out of service due to abnormal indications in range 9.

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Page 2 Licensee Event Report Reportable Occurrence No. 50-219/82-60/03L d

i Apparent Cause of Occurrence The apparent cause of this occurrence was a misinterpretation of Technical Specification requirements by Operations personnel. Since control rods would be fully inserted and no rods were to be moved while IRM channels 16 and 17 -

were inoperable, the protective instrumentation requirements of Technical Specifications, Table 3.1.1 were believed to have been followed.

Analysis of Occurrence Intermediate range monitors are required to be in operation during rod movement operations . The safety significance of this event is minimal since the control rods were fully inserted and not moved during the period of the occurrence. As an extra precaution, an administrative rod block was inserted to ensure that no rod movement occurred.

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Corrective Action IRM Channel 17 was repaired, tested, and. returned to service. Channel 16 has also been returned to service with additional maintenance scheduled during the upcocing refueling outage. This Licensee Event Report will be placed on the control room personnel required reading list in order to emphasize strict compliance with Technical Specifications.

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