ML20137B798

Responds to 850731 Request for Addl Info Re C-E Reactor Vessel Level Monitoring Sys.Recommendations for Mods to Emergency Operating Procedures Accounting for Differences Between C-E & Westinghouse Sys Developed

ML20137B798
Person / Time
Site:	Millstone
Issue date:	08/15/1985
From:	Opeka J NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Youngblood B Office of Nuclear Reactor Regulation
References
A02959, A2959, B11654, NUDOCS 8508220142
Download: ML20137B798 (11)

Text

o N UTILETIES cenerei Orrices. seioen street. Beriin. connecticut t., ca screr.

Titia:

CRITICAL F-0 SAFETY FUNCTION HP/LP, REV.1 STATUS TREES 1 Sept.,1983 FIGURE 1 (CONT.)

FOOTNOTES F-0.2 CORE COOLING (1) Entersum of temperature and pressure measurement system errors, including allowances for normal channel accuracies and post accident transmitter errors, translated into temperature using saturation tables.

(2) Enter plant specific value which is 3-1/2 feet above the bottom of active fuelin core with zero void fraction, plus uncertainties.

(3) Enter plant specific value corresponding to an average system void fraction of 50 percent with 4 RCPs running, plus uncertainties.

(4) Enter plant specific value corresponding to an average system void fraction of 50 percent with 3 RCPs running, plus uncertainties.

(5) Enter plant specific value corresponding to an average system void fraction of 50 percent with 2 RCPs running, plus uncertainties.

(6) Enter plant specific value corresponding to an average system void fraction of 50 percent with 1 RCP running, plus uncertainties.

F-0.3 HEAT SINK (1) Enter plant specific value showing SG leveljust in the narrow range, including allowances f or normal channel accuracy, post-accident transmitter errors, and reference leg process errors, not to exceed 50%.

(2) Enter the minimum safeguards AFW flow requirement for heat removal, plus allowances for normal channel accuracy (typically one MD AFW pump capac-Ity at SG design pressure).

(3) Enter plant specific pressure for highest steamilne safety valve setpoint.

(4) Enter plant specific value for SG high-high level feedwater isolation setpoint.

(5) Enter plant specific pressure for lowest steamline safety valve setpoint.

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