ML19320A183
| ML19320A183 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/01/1977 |
| From: | Rueter D ARKANSAS POWER & LIGHT CO. |
| To: | Zieman D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8004210486 | |
| Download: ML19320A183 (3) | |
Text
_ _ _
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Sl!N DOCKET NUM!E R f-8 50-313 NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL TO: D.L.ZIEMANN FROM: ARKANSAS PWE & LIGHT Cr.
DATE OF COCUMENT LITTLE ROCK, ARKANSAS 3/1/77 D.A.RUETER oATE RECEivEo 3/5/77 OLETTER ONOTORIZED PROP lNPUT FORM NUMBER OF COPIES RECEIVED ETORiciN AL D U NC LASSIFIE D OCOPY l SIGNED CY. RECEIVED)
DESCRIPTION E' CLOSURE LTR. EXPRESSING CONCERN RELATING TO THEIR PROPOSED TECH. SPECS FOR THE REACTOR INTERNALS vENr vit.vES.......
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Director of Nuclear Reactor Regu1Dion 7/.
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ATIN: Mr. D. L. Ziemann, Chief 4
wa Operating Reactors Branch #2 U. S. Nuclear Regulatory Commission
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Washington, D. C.
20555
Subject:
Arkantas Nuclear One-Unit 1 Docket No. 50-313 License No. DPR-51 Proposed Technical Specifications (File:
1511.1)
Ref:
Telecon between R. Snaider(NRC)/D. Rueter(APSL),
dated 2/24/77 Gentlemen:
1 Via telecon on February 24, 1977, the NRC Staff expressed a concern i
relating to our proposed Technical Specifications for the reactor internals
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vent valves. This concern dealt with the effects on peak cladding tempera-ture from changing the 0.5 psid force that was assumed for full opening of the vent valves in the ANO-1 WCA safety analysis (reference ANO-1 FSAR page 14-43) to 1.0 psid that was submitted in our proposed Technical Specifications letter of December 1,1976.
B6W has evaluated the proposed change in the required opening force for the vent valves and found no significant effects on the peak cladding temperature during a LOCA.
The large break WCA analysis for the ANO-1 NSS, which is reported in BAW-10103, was reviewed and it was determined that, with the exception of the first 0.2 seconds of the reflooding phase of the accident, a pressure differential in excess of 1.0 psid was maintained across the vent valves. Therefore, the vent valves would remain fully open during reflooding, except for the first 0.2 seconds, even if the proposed 1.0 psid force was required.
For the analysis in BAW-10103, the vent valves were assumed always to be fully open. Thus, the proposed change could only have a 0.2 second effect. Even if it is assumed
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Mr. D. L. Ziemann Mtrch 1, 1977 1-037-3 that the cladding would undergo an adiabatic heatup, over the 0.2 second interval, peak cladding temperature would increase by only 70F.
In actuality the 0.2 second interval would be decreased by the rapid increase in upper plente pressure that would occur with the vent valves closed. Additionally, over the 0.2 second delay, the heatt'p would not be adiabatic. The expected increase in cladding temperature would be only 30F.
Thus, the cladding temperatures reported in BAW-10103 are essentially unaffected by the proposed change.
Presently, ANO-1 is scheduled for Cycle 2 criticality on March 19, 1977.
If you should have any further questions concerning our Cycle 2 reload analysis, please see that we are informed immediately as not to delay our sc%dule.
Very truly yours, em Monald A. Rueter F Manager, Licensing DAR:DGl:tw f
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