ML18283B438

LER 1977-004-00 for Browns Ferry, Unit 3, Cmflpd Exceeded Limit on 1/15 & 1/18/1977, & MAPRAT Exceeded Limit on 1/18 & 1/24/1977

ML18283B438
Person / Time
Site:	Browns Ferry
Issue date:	03/10/1977
From:	Fox H Tennessee Valley Authority
To:	Moseley N NRC/RGN-II
References
LER 1977-004-00
Download: ML18283B438 (6)

Text

DOCKET NUMBER g~R FILE NUMBER hlFIC DISTRISUTION roB PART 50 DOCKET MATERIAL ~

INCXDENT REPORT N.C'. MHSELEY FROM: TENNESSEE VALLEY AUTHORITY DATE OF DOCUMENT CMTTANOOGA, TENN. 3 10 77

~ H.S. DATE RECEIVED I FOX I 467 ETTE R 0 MOTOR IZ E 0IED'ROP INPUT FORM NUMBER OF COPIES RECEIVED I%OR IG INAL QCOPV C/NCLASSIF P ~r DESCRIPTION ENCLOSU BE LTR. TRANS THE FOLLOWING.......'.. LICENSEE EVENT REPORT FOR R.O..N74 ON 1/15/

77 CONCERNING THE CMFLPD'EXCEEDING THE LIMIT.

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1'l gg g<gi55 PLANT NAME: BROWNS FERRY // 3 gg SAB NOTE: IF PERSONNEL EXPOSURE IS IÃ70LVED SEND DIRECTLY TO KREGER/J~ COLLINS FOR ACTION/INFORMATION BRANCH CHXEF:

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March 10, 1977 Mr. Norman C. Moseley, Director U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region II 230 Peachtree Street, NW., Suite 1217 Atlanta, Geor'gia 30303

Dear Mr. Moseley:

TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT UNIT 3 DOCKET NO. 50-296 FACILITY OPERATING LICENSE DPR-68 REPORTABLE OCCURRENCE REPORT BFRO-50-296/774 The enclosed report is to provide details concerning CMFLPD that exceeded the limit on January 15, and January 18, 1977, and MAPRAT that exceeded the limit on January 18, and January 24, 1977. This report is submitted in accordance with, Browns Ferry Technical Specifications Section 6. This event occurred on Browns Ferry unit 3.

Very truly yours, TE SSEE VALLE AUTHORITY S. Fox Director of Power Production Enclosure (3)

CC (Enclosure):

Director (3)

Office of Management Information and Program Control U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Director (40)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 An Equal Opportunity Ernpioyer

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'0 69 74 75 60 EUENT OESCRIPTION IAt 2319 hours0.0268 days <br />0.644 hours <br />0.00383 weeks <br />8.823795e-4 months <br /> on 1/15/77 CMFLPD went't'b'.998 (limit 0.992) in node 9 at 3279 MWt. Powerj 63

[was decreased to 3260 MWt by flow reduction to bring CMFLPD to 0.990 ELt node 9 within 2 69- 60 jhours. At 0300 on 1/18/77 CMFLPD went to 0.994 (limit 0.992) in node 9 and MAPRAT went II 60 to 1.002. Power was reduced with flow about.15 MWe to bring CMFLPD went to 1.003 and (Ovef) 6 9 60 I

3 PR'r.E SF STEM CAUSE COMPQNETI COMPONENT COOE COOS COMPONENT COOE 5UPPUEA M2ANUFACTUAEA VOLATION I~RC F F U E L X X N G 0 8 0 N 10 11 12 17 43 44 47 48 CAUSE OESCRIPTION jThese limits were exceeded due to gadolinia burnout in the fuel causing an increase 8 9 80 in the local LHGR. In all cases, flo'w decreases reduced power to bring CMFLPD in 6 9 8FII jlimits within 2 hours.

8 Q FACILITY METHOO OF STATUS POWER OTHER STATUS OISCOVEAY 06COVERY OESCAiPTION E ~09 9 N/A B N/A 60 8 9 10 12 13 44 45 46 FOAtrI OF A TIVITY CONTENT

<<ri E SEO OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE Z Z N/A N/A 9 10 11 44 45 60 PERSONNEL EXPOSURES N/A 6 11 12 13 80 PERSONNEL INJURIES NI'MGER OESCAIPTION Loaooj N A I o 11 12 OPPOSITE CONSEGUENCES N/A 7 E S LOSS OR OA>vIAGE TO FACILITY

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'6 10 60 P'BLICITY N/A "l0'1 ' FACTORS The events were recognized reportable during a periodic review of the technical specificatW'n by the reactor engineer. Prior to this time, the correction of- the out-of-limit condition

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>~CPiyPP gOCUMBlT P 140CE.SSlRG UNIT 19f( APR 6 PIIIL l 50 Event Descri tion (Continued) iI MAPRAT to 1.009. Power was reduced by flow from 3281 Mft to 3269 MWt to bring CMFLPD to 0.990 and MAPRAT to 0.997 within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. At 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> on 1/24/77 MAPRAT went to 1.002 while at 3260 MWt. Power was reduced with flow 10 MWe to bring MAPRAT to 0.999 with 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. BFRO-50-296/774.

Additional Factors (Continued) within the interval specified in the limiting condition for operation was not considered reportable.