ML19210D703

Ro:On 791109,steam & Feedwater Rupture Control Sys Steam Generator Low Level Trip Setpoint Discovered Less Conservative than Tech Spec Requirements.Caused by Level Transmitter Setpoint Drift.Design Work Underway

ML19210D703
Person / Time
Site:	Davis Besse
Issue date:	11/12/1979
From:	Murray T TOLEDO EDISON CO.
To:
References
NUDOCS 7911270471
Download: ML19210D703 (1)

Text

E0 -3% ;5 cro,so y ae stj?. ace W.bh 0 T-,g1,3gecr>..L,,1no ceen'November 12, 1979 hW pate--TO: U. S. Nuclear Regulatory Commission qine_Office of Inspection and Enforcement initia 'Region III Attention: Tom Tambling

_, W-

SUBJECT:

Reportable Occurrence Per Technical Specification 6.9.1.8.1

.On November 9, 1979 at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br />, it was determined a reportable event existed in that the Steam and Feedwater Rupture Control System steam generator low level trip setpoint was less conservative than was recuired by Technical Specification 3.3.2.2 Table 3.3-12.

It was determined by Tolea0 Edison personnel during comple-tion of the response to I.E.Bulletin 79-21 that the level transmitter setpoint was not properly compensated for the hot operating conditions.

Design work is proceeding to correct the setpoint for hot ambient conditions. The setpoint will be modified prior to the unit entering Mode 3 from the present unit outage.Onsite inspector, Luis Reyes was notified at 1645 hours0.019 days <br />0.457 hours <br />0.00272 weeks <br />6.259225e-4 months <br /> on November 9, 1979.

D Terry D. Murray Station Superintendent

• Davis-Besse Nucler Power Station Toledo Edison Company TDM/SN8/ljk

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