ML20081K020
| ML20081K020 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 11/07/1983 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8311090234 | |
| Download: ML20081K020 (4) | |
Text
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7 PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 (215)841 45o2 VIC E PRESIDE NT E NGINE E R8hG AMD RE bE ARCH Mr. A. Schwencer, Chief Licensing Branch No. 2 United States Nuclear Regulatory Commission Washington, DC 20555
Subject:
US NRC Concerns Regarding Adequacy of Design Margius of Mark II Containment Systems
References:
1 - R. L. Tedesco, NRC, to E. G. Bauer, PECO, dated July 8, 1982 2 - Letter, J. S. Kemper, PECO, to A. Schwencer, NRC, dated September 30, 1982 Docket Numbers 50-352 50-353
Dear Mr. Schwencer:
In response to the NRC's request of July 8,1982, reference 1 letter, we transmitted our responses (reference 2) to a number of concerns that had been raised by Mr. John Humphrcy regarding the adequacy of the General Electric Mark III Contair, ment design.
In concluding our review of the containment hydrodynamic phenomenon, we have revised our response to item 3.1 and 3.3.
These revised responses are attached for your information.
Very truly yours, b.
WM k
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s 3.
ECCS Relief Valve Discharge Lines Below the Suppression Pool Level 3.1 The design of the STRIDE plant did not consider vent clearing, condensation osci.?1ation and chugging loads which might be produced by ;he actuation of these relief valves.
Response
The Limerick design has considered vent clearing, condensation oscillation, and chugging loads produced by RHR heat exchanger relief valve discharges into the suppression pool.
In particular, the RHR relief valve discharge piping, supports, and attachments have been assessed for both water clearing fluid transient loads and chugging /CO lateral tip loads.
Each of these loading phenomena were combined with normal operating loads in order to demonstrate structural adequacy during the relief valve transient.
Our design assessment confirms that adequate design margin exists for the piping system to accommodate water clearing and CO/ chugging tip loads.
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3.3 Discharge from the RHR relief valves may produce air bubble discharge or other submerged structure loads on equipment in the suppression pool.
Response
The Limerick design has considered RHR relief valve air bubble loads on adjacent submerged structures listed below:
Liner plate Downeomer and collar Downcomer bracing Column MSRV discharge line RCIC restraint RHR relief valve discharge piping, supports, and attachments.
RHR suction strainer and T-piping.
Our assessment confirms that adequate design margin exists for these structures to accommodate air bubble loads in i
combination with normal operating loads.
Discharge from RHR relief valves during vent clearing may also produce water jet submerged structure loads on equipment in the Limerick suppression pool.
However, no equipment or structures are located directly below the RHR relief valve discharge pipe.
Therefore, water jet phenomena are limited to an induced loading condition which will have negligible effect on submerged structures.
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