ML20084U285

LERs BFRO-50-260/7611 & BFRO-50-296/764:on 760909,oxygen Sensors in CAM Sys Calibr Using Svc Air & hydrogen-nitrogen Mixture Gas Instead of 2% Oxygen Mixture Gas.Caused by Lack of Instructions in OL

ML20084U285
Person / Time
Site:	Browns Ferry
Issue date:	09/22/1976
From:	Fox H TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
BFRO-50-296-764, LER-BFRO-50-260-761, NUDOCS 8306280500
Download: ML20084U285 (3)

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UCENSEE EVENT REPORT f .

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CONTROL OLOCV.:l l l

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\AlLlBlRlFl2l ,14 lb 31 32 EVENT DATE REPORT DATE CATECORY T p OOCKET NUMBEA l 0] 9l Ol 9l 7l 6l l l l l l l l-o 1 CON T' l l l { lE l l0 l 5 l0 l-l 0l 2] 6l 0l 68 69 74 75 80 7 8 57 58 SS 60 61 EVENT DESCRIPTION l gp g02 sensors in CAM system on units 2 and 3 were calibrated using service air and H2-N 2 60 9 00 l g jnixture gas instead of 2% 02 volume mixture gas as specified in 4.7.H.1.b of the tech 80 7 89 H., l g lcpecs. H2 sensors were calibrated using 4% H 9 volume mixture eas and not 3%

• BD 7 89 BFRO-50-260/7611 l Q l volume mixture gas as required in 4.7.H.1.a of the tech. specs. 6 7 89 80

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LICENSE EVENT REPORT BFRO-50-260/7611 BFRO-50-296/764 CAUSE DESCRIPTION CAM calibration instruction was written and performed prior to issuance of operating license and reflected a proposed technical specification change allowing service air une for 02 calibration. The operating license when issued did not include the proposed change; therefore, the calibration instruction was in error and did not comply with the technical specifications.

ADDITIONAL FACTORS ,

The validity of the original calibration of 0 sensors using service air and H -N 2 2 2 gas mixture was confirmed when 2% 20 v lume gas was applied. A 4% H 2mixture calibration gas was considered adequate to satisfy nominal calibration requirements for the H sensors. Personnel involved in the preparation and review of this -

2 surveillance instruction have been reminded that surveillance instructions must comply with the technical specifications and shall. not be revised to reflect proposals

• until officially issued. Unit *3'vas in cold shutdown. j 9

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g40*"*A' c,, b- /b - f' e TENNESSEE VALLEY AUTHORITY O m E .- CHATTANOOGA. TENNESSEE 374o1

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76-19 8 .

Septeuber 22, 1976 @p 4

/kj Mr. Norman C. Moseley, Director suznmJ V.a.

U.S. Nuclear Regulatory Co=nission

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Office of Inspection and Enforecuent ~

- '- i' Region II LP i 230 Peachtree street, IM., 8th Floor s I I Atlanta, Georgia 30303

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Dear Mr. Moseley:

TEIEIESSEE VATM "WNTW - BROWN 3 FERRY NUCLEAR PIAITI IGITS 2 AND 3 -

DOCKET NOS. 260 AUD 50-2TE)- FACIMTY OiERATING LICCSES DPR-52 AND DPR OCCURRUCE REPORTS BFRO-50-260/7611 AHD BFRO-50-2%;764 The enclosed report is to provide details concerning 02 and H2 sensors in the C!dd systen that vero not calibrated in accordance with the technical specifications. This report is cubaitted in accordece with Emynq Fm ry Technien1 Specifications Section 6.

This event occurred on Browns Ferry Nuclear Plant unita 2 and 3 Very truly yours, TEmlESSEE VALIEf AITHIORITY

, . H. S. Fox <

Director of Power Production i

i Enclosure (3)

CC (Enclosure): '

Director (3) '

Offico of Manaccuent Information and Program Control

. U.S. Nuclear Regulator / Comaission Washington D.C. 20555

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Office of Inspection and Diforconent U.S. I.bclear Regulatory Comission I

Washington, D.C. 20555 cas cm suramoC C 9773

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