ML17292B228

Informs of Unexpected Change in Feedwater Temperature & Flow Indication Used to Calculate Plant Heat Balance During Routine Trending of Plant Computer Feedwater Temperatures on 980112.Corrective Actions Reduced Reactor Power to 99%

ML17292B228
Person / Time
Site:	Columbia
Issue date:	01/14/1998
From:	Bemis P WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Merschoff E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
GO2-98-006, GO2-98-6, NUDOCS 9801220259
Download: ML17292B228 (3)

Text

CATEGORY 1 REGULA RY INFORMATION DISTRIBUTI SYSTEM (RIDS)

ACCESSION NBR:9801220259 'OC.DATE: 98/01/14 NOTARIZED: NO DOCKET FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe 05000397 AUTH.HAME AUTHOR AFFILIATION BEMIS,P.R. Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION MERSCHOFF,E.W.'egion 4 (Post 820201)

SUBLI'ECT: Notification of unexpected change in feedwater temperature 6 flow indication used to calculate plant heat balance during routine trending of plant computer feedwater temperatures on DISTRIBUTION CODE: IEOID COPIES RECEIVED:LTR j 980112.Corrective actions reduced reactor power to 99t.

TITLE: General (50 Dkt)-Insp Rept/Notice of Violation Response ENCL 0 SIZE:

NOTES:

RECIPIENT COPIES RECIPIENT COPIES ZD CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL 0 PD4-2 PD POSLUSNY,C R

INTERNAL: ACRS AEOD/SPD/RAB AE J)J 'I~

LE CENTE DEDRO NRR/DRCH/HHFB 1

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NRR DRPM PECB NRR/DRPM/PERB 1 1 NUDOCS-ABSTRACT OE DIR 1 1 OGC/HDS3 RGN4 FILE 01 1 EXTERNAL: LITCO BRYCE,AI' NOAC NRC PDR NUDOCS FULLTEXT D 0

N NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR 19 ENCL

WASHINGTON PUBLIC POWER SUPPLY SYSTEM P.O. Box 968 ~ Richland, Washington 99352-0968 January 14, 1998 G02-98-006 Docket No. 50-397 Mr. EW Merschoff NRC Regional Adm'inistrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064

Subject:

WNP-2 OPERATING LICENSE NPF-21 FACILITY OPERATION AT REACTOR CORE POWER LEVELS IN EXCESS OF FULL POWER This is a notification to the NRC Regional Administrator in accordance with Facility Operating License Condition 2.F.

On January 12, 1998, routine trending of the plant computer feedwater temperatures by plant personnel revealed an unexpected change in the feedwater temperature and flow indication used to calculate plant heat balance starting on January 9, 1998, Due to the possibility of exceeding 100 percent rated thermal power (3486 Mwt) because of the feedwater indication error, immediate corrective actions were taken to reduce reactor power 1 percent, to 99 percent rated thermal power as indicated by the plant computer, and control room personnel were directed not to increase reactor power above 99 percent until further notice.

On January 13, 1998, the Supply System confirmed by detailed analysis of plant computer heat balance data that, due to the feedwater indication error, reactor thermal power exceeded Condition 2.C(1) of the Facility Operating License, which limits reactor power to less than or equal to 3486 Mwt. The analysis revealed that the maximum reactor power during the three day period from January 9 through January 12 may have been as high as 100.7 percent rated thermal power.

Although the Facility Operating License Condition 2.C(1) for maximum power level was exceeded, there appears to be no immediate reactor safety issue at this time.

980i220259 980ii4 PDR ADQCK 05000397 IIIIIIIIIIIIIIIIIIIIIIIIIIIII

~l 8 PDR

FACILITY OPERA AT REACTOR CORE POW EVELS IN EXCESS OF

. FULL POWER Page 2 Should you have any questions regarding this matter, please call me or Mr. PJ Inserra at (509) 377-4147.

Respectfully, 4 7y Be is Vice President, Nuclear Operations Mail Drop PE23 CC: Document Control Desk - NRC KE Perkins, Jr. - NRC RIV, Walnut Creek Field Office C Poslusny, Jr. - NRR NRC Sr. Resident Inspector - 927N DL Williams - BPA/399 PD Robinson - Winston & Strawn ~