ML20084S286

RO 50-254/76-38:on 761215,GE Notified Util That NRC Discovered Errors in Code Inputs to ECCS App K Analysis, Caused by GE Incorrectly Applying Data for ECCS App K Analysis.Maplhgr Curves Reduced by 4%

ML20084S286
Person / Time
Site:	Quad Cities
Issue date:	12/28/1976
From:	Kalivianakis N, Petri R COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S193	List: ML20084S190 ML20084S204 ML20084S286 ML20084S339
References
NJK-76-485, RO-50-254-76-38, NUDOCS 8306160445
Download: ML20084S286 (3)

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,i ,y J. Keppler, Regional Director Office of Inspection and Enforcement Region ill U. S. Nuclear Regulatory Commission 799 Rooseve1t. Road Glen Ellyn, Illinois 60137 Refe'rence : Quad-Cities Nuclear Power Station Docket No. 50-254, DPR-29, Unit I Docket No. 50-265, DPR-30, Unit 2 Appendix A, Sections 3 5.1 and 6.6.B.I.h Enclosed please find Reportable Occurrence Report No. RO 50-254/76-38 for Quad-Cities Nuclear Power Station. This occurrence was previously reported to Region ill, Office of Inspection and Enforcement by telephone on December 16, 1976 and by telecopy on December 16, 1976.

This report is submitted to you in accordance with the requirements of Technical Specification 6.6.B.I.

Very truly yours,

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COMMONWEALTH EDISON COMPANY

( QUAD-CITIES NUCLEAR POWER STATION

,ff *A N. J. Kalivianakis ^

Station Superintendent

. 583 NJK/FJG/lk cc: G. A. Abrell JAN3 1977 9306160445 770217

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LICENSEE EVENT REPDRT

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• [PLEASE PRINT C.LL EEZUIRE'3 INFCM ATION) 1 6 AME ECENSE NUMBER E Y Oi I il t I ol Al Dl1 l l0l0l-l0 l0 l0 l 0 l 0 l - h l0 l l4l1 ll l1 l1 l l0 l1 l 7 89 14 15 25 26 30 31 32 CATEGORY TP SO DOCKET NUMBER EVENT DATE $4EPORT DATE 01 CONT l 7 8 57 l

58 I LTJ 59 L4 60 1015101-101215141 lil2lil51716l li l2 l218 l 7l 61 61 68 69 74 75 80 EVENT DESCRIPTION E5 l On December 3, 1976, General Electric Company notified Commonwealth Edison Company l 7 09 00

@l that the Nuclear Regulatory Commission had discovered errors in the code inputs to l 7 89 80 Ql the ECCS Appendix K analysis. These errors were discovered during the NRC l 7 89 80 EE l continuino review of the ECCS Re-analysis as required by 10CFR50.46 and Appendix K. l 7 89 80 SE l On December 15, 1976 General Electric Company informed Commonwealth Edison Company ,

7 89 pnug 80  ;

DE CODE COMPONENT CODE SUPPL R MANUF UF A VOLATON BE lZ lZ l LC_j 7 89 10 11 l Zl Zl ZI Zi 21 d 12 17 W 43 44 lZ l9 l9 l9 l 47 W 48 j

CAUSE DESCRIPTION j gg l (Proximate Cause-External Cause) General Electric Co. Incorrectly applied date for l l 7 89 80 EE l their ECCS Appendix K analysis resulting in the Maximum Average Planar Linear Heat l l 7 89 80 DE I Generation Rate (MAPLHGR) curves beino 4% non-conservative. l FACLITY METHOD OF

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STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTON 1

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l 0l 9l 3l 'l NA l [Dj l Review of G.E. Analysis by NRC l 10 12 13 44 45 46 DO Ett SED OF E ASE AMOUNT OF ACTIVITY LOCATON OF RELEASE BE LzJ LzJ l "A I I NA 7 8 9 10 l

11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTON DE l 010101 Lj l NA l

7 89 11 12 13 80 PERSONNEL INJURlES IJUMDER DESCRIPTON DE l 010101 I NA '

l 7 09 11 12 80 OFFSITE CONSEQUENCES DE l NA

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7 09 80 LOSS OR OAMAGE TO FACILITY -

TYPE OESCRIPTON 8 L zl 7 89 I

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1 80 PUDLICITY El 7 89 NA l

80 AOOITIONAL FACTORS QS l (EVEN1 DESCRIPTION CONTD) that the preliminary consequence of the input errors to l 7 o9 a0 Ql 7 0 11 the analysis was a 4% reduction in the Maximum Average Planar Linear (cont on attachpd)

UO NAME: Ray Petri pgggg 309-654-2241 (ext 242) g

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'PAGE 2 EVENT DESCRIPTION CONTINUED Heat Generation Rate (MAPLHGR) curves presently in Section 3.5.i of the Quad- ,

Cities Station Technical Specifications. ,

Both quad-Cities Station units operate considerably below the MAPLHGR limits set forth in the Technical Specifications. Normally, at full power, the Average Planar Linear Heat Generation rate is 85% of the MAPLHGR. A 4%

reduction in the limits only affects the margin between the actual heat I generation rate and the maximum allowed heat generation rate; therefore, the consequences of this occurrence are minimal.

Presently, the station is awaiting further information from General Electric Company concerning the final resolution of this matter. (R0 50-254/76-38)

' Corrective Action Taken To Prevent Recurrence I

- The MAPLHGR curves presently used by the process computer were reduced by 4% on December 15, 1976 for both Units One and Two. This will remain in effect until further information is received by the Station.

. Failure Data A similar occurrence was reported under Report Ro 50-254/76-27, which identified an error in the ECCS Analysis. This caused a reduction in the APLHGR limits at reduced core flows.

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