ML20073K562
| ML20073K562 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 04/01/1983 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20073K547 | List: |
| References | |
| NUDOCS 8304200343 | |
| Download: ML20073K562 (1) | |
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_ SAFETY EVALUATION BY. THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 85 TO LICENSE NO. DPR-49 IOWA ELECTRIC LIGHT AND POWER COMPANY CENTRAL IOWA POWER COOPERATIVE CORN BELT POWER COOPERATIVE DOCKET NO. 50-331 DUANE ARNOLD ENERGY CENTER 1.0 Introduction By letter dated November 18, 1982, the Iowa Electric Light and Power Company, (the licensee), submitted a request to amend Facility Operating License DPR-49 for the Duane Arnold Energy Center. The proposed amendment will permit the licensee to change the trip level setting requirements for the residual heat removal (RHR) and core spray pump discharge pressure interlock switches.
The justification for this change is to incorporate changes recommended by General Electric to provide consistency in the inputs to all emergency core cooling system (ECCS) analyses.
2.0 Evaluation In a letter dated' November 18, 1982, the licensee proposed'to modify Table 3.2-B of the Technical Specifications by changing the trip level setting requirements for the RHR pump discharge pressure switch from l100 psig to 125 + 25 psig and core spray pump discharge pressure interlock switch from 100+5 to 145+20. The discharge pressure interlock switches defer actuatioii of the automatic depressurization system (ADS) until confirmation that a low pressure ECCS pump is runnirig.
In this way the availability of an ECCS water supply is verified prior to automatic blowdown.
The licensee states that the selected setpoint for the core spray discharge pressure switch was based on the criteria that the setpoint must be higher than 110% of the relief valve setpoint in the core spray suction line to preclude a false indication of a running pump and Icwer than the core spray pump heat at maxiumum run-out flow conditions to indicate a running pump 4
for all core spray system flow conditions.
We find that the proposed core spray pressure switch setpoint (maximum) of 165 psig is below the head developed by the core spray pump at run-out (233 psig) and will therefore provide indication for all core spray pump a
operating conditions.
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