ML20066G499
| ML20066G499 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 02/13/1991 |
| From: | Stols R COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9102190155 | |
| Download: ML20066G499 (2) | |
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-i 1400 Opus Place Downers Grove. Illinois 60515 February 13, 1991 Dr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Attn: Document Control Dett
Subject:
Quad Cities Nuclear Power Station Unit 1 Ciarification to Proposed Facility Operating License Appendix A Technical Specification Amendment NRC_DmitLLHL._50:25_4
Reference:
R. Stols to T. Murley letter dateu December it, 1990.
Dr. Murley:
The referenced letter transmitted an application to facility Operating License DPR-29 Appendix A, Technical Specification. The proposed amendment reflects a modification to the fast acting solenoid valves which initiate rapid closure of the turbine control valves.
The new design for the fast acting solenoid valve utilizes a pressure switch (in lieu of a lim'1t switch) to initiate a reactor scram. As a result, the pressure switches require periodic calibration and have a setpoint for actuation of the reactor scram.
In-the referenced submittal, Commonwealth Edison Company (CECO) provided calculation E0E-40-1190 dated November 16, 1990, in support of the proposed setpoint for the pressure swlN.n.
Page 3 of the calculation states that the calibration of the setpoint is accomplished using a Heise pressure gauge (0-1000 psig) with an accaracy of +0.1% of full scale (tl psig). Since that time, CECO has determines that a 0-2000 psig pressure gauge with an accuracy of 10.2% of full scale ( 4 psig) will be used to calibrate the pressure switch.
The change in the pressure gauge does not affect the proposed Technical Specification setpoint for the pressure switch.
The calculation identifies a calibration accuracy for the pressure switch of 1% of full range (130 psig);
therefore, the use of a pressure gauge with an accuracy-of 0.2% of full sc*le (14 psig) is bounded by the calculation.
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Dr. T.E. Murley February 13, 1991 The change in the pressure gauge also does not affect the proposed nominal setpoint.
The use of a pressure gauge with an accuracy to +4 psig, coupled with a-2 psig calibration and reading um ertainty, changes the required limit (RL) term from 520.03 psig to 520 21 psig. A RL value of 540 psig is utilized in the calculation to meet the 'talue for ninoty percent (90%)
probability for LER avoidance.
Based on the above ir, formation, the use of the 0-2000 psig pressure gauge does not affect the prerosed Technical Specification or the associated evaluation of No Significant Hazards Consideration, If there are any questions or comments, please contact me at (708) 515-7285.
Very truly yours, hlI@
R. Stols 1
Huclear Licensing Administrator
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cc:
A.B. Davis, Regional Administrator - RIII
'L'.N. Olshan, Project Manager - NRR T.E. Taylor, Senior Resident Inspector Illinois Department of Nuclear Safety ZNLD744/12-13 i
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