ENS 52998

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v t e ENS Event
16:15 Oct 2, 2017
Title	Initial Part 21 Notification - Cameron Model 752B Differential Pressure Transmitters
Event Description	This report is made per 10 CFR Part 21.21(d)(3)(i) on the identification of a defect or a failure to comply. By the letter dated August 31, 2017, Westinghouse notified Callaway Plant that they were unable to complete a 10 CFR 21.21(a) evaluation for a product advisory which was issued by Cameron Measurement Systems for a concern with the Model 752B transmitter product line. The product advisory identified the potential for instability in the transmitter output signal under certain grounding conditions. Callaway was supplied transmitters that could be affected under Westinghouse part numbers 8765D64G03, 8765D64G04, and 8765D64G05. The Westinghouse notification letter served as the transfer of reporting responsibilities for this concern from Westinghouse to Callaway in accordance with 10 CFR 21.21(b). The 10 CFR Part 21 evaluation is based on the technical information provided by Westinghouse. The notification letter describes that shifts up to 10-20 percent of instrument scale (1.6-3.2mA) can be observed within the transmitter output under the grounding conditions such as those introduced by the original equipment manufacturer during testing. Westinghouse evaluations concluded that such instabilities would be self-revealing within plant applications for which the transmitter output signal was supplied to a Westinghouse 7300 system, assuming the transmitter stanchion was grounded. Not all transmitters within this product line were subject to this concern. On 10/02/2017 Callaway personnel completed the 10 CFR Part 21 evaluation. Of the transmitters identified above, only one is currently installed at Callaway in location BNLT0930, Refueling Water Storage Tank Protection A Level Transmitter. No instabilities (oscillations) have been observed in this transmitter but plans are being made to replace the transmitter. If one of the susceptible transmitters were installed for RCS flow application (low flow reactor trip function), the allowed sensor drift to accommodate changes in transmitter performance would be required to be limited to 1percent of instrument span per an 18-month operating period. Current margin available within the set point uncertainty analysis for this Reactor Trip function is 0.62 percent of instrument span. The observed shift in output of 10-20 percent of instrument span would thus exceed the available margin for this protective function. Therefore, the safety function for this device could not be assured for all transmitter configurations. This condition could create a substantial safety hazard due to the loss of safety function of a basic component which meets the criteria of major degradation of essential safety-related equipment. For the situation at Callaway, no other reporting criteria apply since there is no evidence that the installed transmitter BNLT0930 is susceptible to the concerns noted in the product advisory. The NRC Resident Inspector has been notified of this issue.

ENS 52998 +/-
Where
Callaway Missouri (NRC Region 4)
Reporting

10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
Time - Person (Reporting Time:+23.62 h0.984 days <br />0.141 weeks <br />0.0324 months <br />)
Opened:	Shannon Gaydos 15:52 Oct 3, 2017
NRC Officer:	Jeff Herrera
Last Updated:	Oct 3, 2017
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v • d • e

v t e Emergency Notification System
Callaway with 10 CFR 21.21(d)(3)(i), Failure to Comply or Defect
WEEKMONTHYEAR2025-05-02T05:00:00 [Table view]
[ENS list for Callaway]

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