ML20078M978

Telecopy Ro:On 831013,routine Analysis of 831007 Scram Revealed That 2-LT-85-45A Did Not Initiate Trip When SDIV Exceeded 50 Gallons.On 831014,testing of Transmitter Revealed Slow & Erratic Response to Measured Variable

ML20078M978
Person / Time
Site:	Browns Ferry
Issue date:	10/14/1983
From:	Jones G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8310250360
Download: ML20078M978 (1)

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L5 2 831014 899 xc: NUC P'R ARMS, 1520 CST 2-C E. A. Belvin, MPB-MS (If radioactive material released)

TELECOPY TO NRC T. G. Campbell, 1760 CST 2-C October 14, 1983 T. L. Chinn, EFNP J. F. Cox, W11B85C-K U. S. Nuclear Regulatory g g n C. W. Crawford, 670 CST 2-C Region II 101 Marietta m 3 iiN

, NW - Suite 3100 P. Duncan, W11C127C-K S. Goldman, E124AC-K Atlanta, Georgia 30303 G. R. Hall, 6204 MIB-K Receptionist, Plt Supt Office BFRO-50-260/83063 R. L. Lumpkin, Jr., 401 UBB-C L. M. Mills, 400 CST 2-C Reported under Technical Specifications 6.7.2. Ad.1)Paulk, NRC Shift Engineer Telecony: Date - 10/14/83 F. A. Szczepanski, 220 401B-C Telenhone: Date - 10/14/83 Time - 1400 l

Person Contacted:

Date of Occurrence: 10/14/83 Time of occurrence: 1330 Unit: 2 Technical Specification Involved: 3 1.A Conditions Prior to Occurrence:

10/14/83 - unit 2 was operating at 1005 and units 1 artd 3 in refueling outage.

Identification and Descrintion of Occurrence:

On 10/13/83, during routine analysis of-the 10/07/83 unit 2 scram, it.was observed that 2-LT-85-45A apparently did not initiate a trip when the level in the SDIV exceeded 50 gallons. This raised questions concerning the response of the transmitter and an investigation began. All other

. instruments on SDIV responded as expected. On 10/14/83, testing of the transmitter revealed slow and erratic response to measured variable.

Annarent Canma of Occurrence:

l The Rosemount differential pressure transmitter model 1153 - DB4N0005 had a i slow and erratic response to measured variable. A problem inside the sealed transmitter is indicated.

Other Related Events:

1 None i

Corrective Action Taken or Plannad:

Scram channel "A" was tripped at 1405 on 10/13/83 A replacement

! transmitter was installed, calibrated, response checked, functionally tested, and returned to service at 0134 on 10/14/63 An investigation into the slow and erratic response will continue.

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G. T ms Po Plant Superintendent --

DICIAL Chriyl '

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