ML19337A245
| ML19337A245 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 09/03/1980 |
| From: | Cross J TENNESSEE VALLEY AUTHORITY |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8009090367 | |
| Download: ML19337A245 (2) | |
Text
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~ TENNESSEE VALLEY AUTHORITY' CH ATTANOOGA. TENNESSEE 37401 500A Chestnut Street Tower II SEP 31980.
Director of Licensing Attention:
Mr. Thomas A. Ippolito,' Chief Operating Reactors Branch No. 2 U.S. Nuclear Regulatory. Commission Washington, DC 20555
Dear Mr. Ippolito:
In the Matter of the
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Docket Nos. 50-259 Tennessee Valley Authority.
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50-260 50-296 Please refer to your letter to H. G. Parris dated April 25, 1980, regarding the effect of a de power supply failure on ECCS performance. That letter transmitted,.as an enclosure, an analysis of the effects of do power supply failures on ECCS conformance calculations and requested that TVA confirm the conclusiens of the analysis regarding the minimum ECCS equipment availability with a do power supply failure for the Browns Ferry Nuclear Plant..
Enclosed is the response to your April 25, 1980, letter for Bros'ns Ferry.
Very truly yours, TENNESSEE VALLEY AUTHORITY
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. L. Cross Executive Assistant to. the Manager of Power Subscribedandsworntopeforeme
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. ENCLOSURE.
RESPONSE TO LETTER FROM T. A. IPPOLITO TO H. O. PARRIS DATED APRIL 25, 1980, EFFECT OF DC POWER SUPPL 7 FAILURE O!! ECCS PERFORf4ANCE BROWNS FERRY NUCLEAR PLANT' (DOCKET NOS. 50-259, -260, -296)
'We have identified no ECCS equipment that would be affected by water spillage since the drywell free drains to the torus and no water will accumulate.
Based on our analyses, the limiting cases for ECCS remaining operable after a de power failure are as follows:
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Small Break ECCS Systems Break Location 1 CS + 1 LPCI + HPCI Discharge 1 CS + 1_LPCI + ADS Discharge Same as above but with 3 LPCI's Suction (two loops)
Large-Break ECCS Systems' Break Location
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1 CS + 1 LPCI + ADS Discharge 1 CS + 3 LPCI's (two loops) + ADS Suction Our conclusions are similar to those reached by General-Electric Company in their letter from R. E. Engel (GE) to P. S. Check (NRC) dated November 1,
- 1978, regarding peak clad temperature (PCT) and the applicability of the
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present maximun average planar linear heat generation rate (MAPLHGR) limits.
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