ML20127K289

Discusses 850613 Telcon Re Thermohydraulic Performance of Facility.Topics Included Feed & Bleed Capability & post-TMI Auxiliary Feedwater Fixes.Facility Unique Among B&W Plants & Does Not Have Full HPI Capability

ML20127K289
Person / Time
Site:	Davis Besse
Issue date:	06/18/1985
From:	Ornstein H NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD)
To:	Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD)
Shared Package
ML20127K267	List: ML20127K263 ML20127K289
References
NUDOCS 8506270358
Download: ML20127K289 (2)

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NUCLEAR REGULATORY COMMISSION wAsHWGTON. D. C. 20556

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JUN 1819stf.

MEMORANDUM-FOR: $. J. Heltemes, Jr., Director, AE00 T. A. Ippolito, Deputy Director, AEOD K. V. Seyfrit Chief, ROAB, AE00 W. D. Lanning, Section Chief,NtSS2, ROAB, AEOD

.FROM: H. L. Ornstein, RSS2, ROAB, AE0D L

SUBJECT:

TELEPHONE DISCUSSIONS REGARDING DAVIS-BESSE PLANT THERMO-

. HYDRAULICS On June 13, 1985, I recefved two telephone calls regarding thermahydraulic performance of 'the Davis-Besse plant. The first call was from Richard Udell, staff member of the House of Representatives, Energy and Commerce Committee.

The second telephone call was from Matt Wald of the New York Tirres. Their questions related to feed and bleed at B & W plants -- having been stimulated by knowledge of my involvement on this issue as it was related to TMI-1 restart, and the relevance to the recent Davis-Besse event.

Basically, the callers had been told by others that Davis-Besse had-feed and bleed capability and that operation of the Davis-Besse plant without AFW subsequent to a loss of main feedwater was a design basis event.

I informed them that my knowledge of the Davic-Besse plant-does not agree with what they had becn told. I mentioned the. fact that Davis-Besse is unique among

.B &.W plants, and unlike the other B & W plants, Davis-Besse daes not have full HPI capability. At Davis-Besse, the HPI pumps cut off at aboot 1625 psi. '

Furthermore, for B & W Plants feed and bleed is not a proven aption. Because of the low head HPI, the chances of success for feed and bletd at Davis-Besse are less than at other B & W plants. As I ' understand, AFW h the key to recovery from a main feedwater trip at that plant. In respease to their questions, I informed them that subsequent to a loss of mair feedwater steam generator dryout occurs in aboutlor 2. minutes at B & W plants. We also discussed the Davis-Besse plant's unique raised loop steam generator configuration.

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. . Regarding post TMI AFW fixes, I indicated that Davis-Bessa had been required to upgrade their AFW system. However, during the six years that have since passed. the fixes have not yet been made. (It was my unjerstanding that the AFW upgrade was planned for the next refueling outage.) We also discussed the fact that the importance of the AFW system was first highlighted 10' years ago in WASH 1400.

P AN $N46 PDR

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The. callers were aware of recent problems that Davis-Besse was having with speed control and water hammer in Davis-Besse's AFW System.

H. L. Ornstein, RSS2 ROAB, AE00 CC: Office of Congressional Affairs -

Office of Public Affairs Distribution ROAB CF ROAB SF H0rnstein DZukor a

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