05000029/LER-1976-008, Updated LER 76-008/010-0:on 760730,review of Rod Ejection Accident Analysis Revealed Error in Method Used for Core 11 Analysis.Caused by Error in Methods & Application of Analysis Codes.Sys of Documentation Control Initiated

Updated LER 76-008/010-0:on 760730,review of Rod Ejection Accident Analysis Revealed Error in Method Used for Core 11 Analysis.Caused by Error in Methods & Application of Analysis Codes.Sys of Documentation Control Initiated

ML19345A634
Person / Time
Site:	Yankee Rowe
Issue date:	09/28/1976
From:	Janet Staub YANKEE ATOMIC ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345A633	List: 05000029/LER-1976-008, Updated LER 76-008/010-0:on 760730,review of Rod Ejection Accident Analysis Revealed Error in Method Used for Core 11 Analysis.Caused by Error in Methods & Application of Analysis Codes.Sys of Documentation Control Initiated
References
LER-76-008-010, LER-76-8-10, NUDOCS 8011240390
Download: ML19345A634 (3)

LER-1976-008, Updated LER 76-008/010-0:on 760730,review of Rod Ejection Accident Analysis Revealed Error in Method Used for Core 11 Analysis.Caused by Error in Methods & Application of Analysis Codes.Sys of Documentation Control Initiated

Event date:
Report date:
0291976008R00 - NRC Website

text

L'OENSEE EVENT REPORT

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6 N ME LCENSE NUMDER PE YPE l Ml Al YlK lR ]1]

l 0 l 0l-l0 l0 l0 l 0 l 0 l-l 0l 0l l 4l1 l 1l 1l 1l l0l1l 01 7 89 14 15 25 26 30 31 32 CATEGORY T

SO DOCKET NUMBER EVENT DATE REPORT DATE

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EVENT DESCRIPTION

O2 l See attached sheet.

l 7 89 80

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7 89 80 ne I i

7 89 pswE 80 E[E ODE COMPONENT CODE MANuF CT o

Izivi LLI i 21 Z l Z l ZI ZI 21 LZ J lZl9I9I9I INI 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION J

l See attached sheet.

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7 89 80 12El I i

FACrJTY METHOD OF STATUS

% POWER OTHER STATUS DECOVERY DGCOVERY DESCRIPTON W

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l Analysis for Core Reload l

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10 12 13 44 45 46 80 ACTr. STY CO$ TENT RE' EASED OF RELEASE AMOUNT OF ACTfVITY LOCATON OF RELE SE 8

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7 89 11 12 80 OFFSITE CONSEQUENCES 1

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1 7 89 80 ADD:TIONAL FACTORS 8I I

8011240 3 7 o l

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James L. St'aub GEM g a g, pgggg

,_ GPO 881 66T

U LER 76-08/010

EVENT DESCRIPTION

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During nonnal operation a review of the Rod Ejection Accident analysis

]

revealed an error in the method used for the Core XI analysis. The I

present core (Core XII) analysis is based on the Core XI analysis. A re-analysis revea16d that the maximum allowable' 2ero power ejected rod worth is 0.75% p vice that calculated for Core XI reload of 1.0% p.

This constitutes a violation of Technical Specification Section E.2.a.(8).

I and is identified as Reportable Occurrence 76-08. A review of the predicted and measured worths for Core XII indicates that the rod worth could not exceed 0.75% p.

]

CAUSE DESCRIPTION 4

A review of the Core XI Rod Ejection Accident Analysis was being performed coincident with that-for the Core XIII Reload Analysis.

This revealed an error in the methods and application of the' analysis codes. Following a thorough review of the Rod Ejection Analysis, a; Technical Specification change was submitted for the present core.

i To prevent errors in future accident analysis calculations, a system r

of doctmentation review and control has been initiated within the.

accident analysis group at the Nuclear Services Division in the-Westboro Office.

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rJitC FonM 195 4

U.7. NUCLE AR REGUL ATORY Comp':StoN OoCKET NUMDER V

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50-29 re-70 FILE NUMBE R N.RC DISTRIBUTION FoR PART 50 DOCKET MATERI AL INCIDENT REPORT TO:

FROM:

e DATE oF DOCUMENT Yankee Atomic Electric Co.

9/29/76 Mr. J. P. O'Reilly Rowe, Mass.

og7, ngeg,ygg Mr. Herbert A. Autio 10/1/76 MLETTE R ONoToR: ZED PROP INPUT FORM NUMDER OF CoPIEC RECEIVED D ORIGIN AL NUNC L AS$1FI E D One signcd copy S oPY l ENCLOSURE orSCRIPTION Ltr. trans the following:

Licensee Event Report (RO 50-29/76-08/010) on 7/30/76 (update report) concerning a review of the Rod Efection Accident analysis revealin;,

an error in the method used for the core XI RQNOT REMOVE

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ACF_NOWLEDGED (1-e>

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PLANT N/Js.

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