05000366/LER-1982-086-03, /03L-0:on 820814,following Control Rod Pattern Adjustment,Core Max Fraction of Limiting Power Density Found Greater than Tech Spec Limit.Caused by Reduction in Xenon Concentration Due to Increased Burnup

/03L-0:on 820814,following Control Rod Pattern Adjustment,Core Max Fraction of Limiting Power Density Found Greater than Tech Spec Limit.Caused by Reduction in Xenon Concentration Due to Increased Burnup

ML20027B266
Person / Time
Site:	Hatch
Issue date:	09/02/1982
From:	Sumner H GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027B256	List: 05000366/LER-1982-086, Forwards LER 82-086/03L-0 05000366/LER-1982-086-03, /03L-0:on 820814,following Control Rod Pattern Adjustment,Core Max Fraction of Limiting Power Density Found Greater than Tech Spec Limit.Caused by Reduction in Xenon Concentration Due to Increased Burnup
References
LER-82-086-03L, LER-82-86-3L, NUDOCS 8209160594
Download: ML20027B266 (2)

LER-1982-086, /03L-0:on 820814,following Control Rod Pattern Adjustment,Core Max Fraction of Limiting Power Density Found Greater than Tech Spec Limit.Caused by Reduction in Xenon Concentration Due to Increased Burnup

Event date:
Report date:
3661982086R03 - NRC Website

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NRC FORM 366 U. S. NUCLEAR REGULATORV COMMISSION (7 77)

LICENSEE EVENT REPORT CON TROL BLOCK: l l

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 12 l l Following a Unit 2 control rod pattern adjustment on 8-14-82, CMFLPD wasi P TTl I found to be greater than fraction of rated thermal power in violation oft lO14ll Tech Spec 3 3.2.2. Corre^ tive action was completed within the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> timel lOisl l limit.

There were no consequences or adverse effects on public health l

lo is l lor safety due to these events. This is a repetitive occurrence (see l

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l Rod withdrawals in areas of low xenon concentration produced areas of l

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,., j tration as a result of increased burnup. APRM's were adjusted to read l

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LER #:

50-366/1982-086 i

Licensee:

Georgia Power Company Facility Name:

Edwin I. Hatch Docket #:

50-366

Narrative

Report for LER 50-366/1982-066 On August 14,. 1982, Unit 2 Core Maximum Fraction of Limiting Power Density (CMPLPD) exceeded Fraction of Rated Thermal Power (FRTP) which is contrary to Tech Specs Section 3.2.2.

The incident occurred following a

control rod oattern adjustment.

Discovery was made 4

following performance of

" Base Distribution and LPRM Calibration" i

procedure and " Periodic Core Evaluation" procedure.

At 1050 CDT on August 14, 1982, CMFLPD equaled 0.677 at core location 31-10-03 while l

FRTP equaled 0.615.

At 1206

CDT, the APRM (Average Power Range Monitors) readings were adjusted to read greater than or equal to 67.7% to comply with the action statement in Tech Specs Section 3.2.2, i

therefore the unit was in compliance with Tech Specs.

These events are repetitive (see RO 50-366/1982-073).

High peaking factors (CMFLPD greater than FRTP) during times of low xenon concentration are common in BWR operation, particularly following control rod pattern adjustments.

The site core management group will continue to review control rod withdrawal sequences and ooerating strategies in order to minimize high peaking problems in future core maneuvers.