ML20085C180
| ML20085C180 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/02/1969 |
| From: | Behnke W COMMONWEALTH EDISON CO. |
| To: | Low L US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20085C151 | List: |
| References | |
| 92710, NUDOCS 8307090208 | |
| Download: ML20085C180 (3) | |
Text
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Commonwealth Edison Company 72 WEST ADAMS STMEET
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ILL9NOIS SOS 90 4
June 2, 1969 1
Mr. Lawrence D. Low, Director y
Division of Compliance.
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U.S. Atomic Energy Commicsion Washington, D.C.
20545
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Your reference 50-237
Dear Mr. Low:
Your letter of May 6 discusses a report you had received from your Region III Compliance Office (Chicago) regarding our plans for testing the piping in certain nuclear systems in the Dresden Unit 2 facility, and requests that we provide you with the following information within 30 days of receipt of your letter:
"a.
A list of all nuclear systems designed to the USA Standard B31.1.0 Code for Pressure Piping which you do not plan to hydrostatically test at 150 percent of the design pressures listed, or implied, in your amended application.
1 "b.
The bases for limiting the hydrostatic test pressure, including a formal code interpretation if appropriate.
If the proposed USA Standard B31.7. Code is used as part of the bases, please provide the necessary design details to support any reduction in test pressure."
In reply to (a) above, the following list-is supplied:
Systems
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d Vain Steam 101
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Extraction Steam =O W A P~
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Reactor Feed =
v*u =12f*%
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.n. L-, IV i-Reactor Recirculating -,2 r 4.
M.n4 44 y_
Core Spray = v.<. J =or y it n) z c'a /
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s f Isolation Condenser : i//
f gc, yo Low Pressure Coolant Injection (LPCI) > 9, e #
Reactor Cleanup' gg g-7 9 27'u
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8307090208 690917 PDR ADOCK 05000237
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Mr. Lawrence D. Low June 2, 1969 Systems Shutdown Reactor Cooling Standby Liquid Control
'" I Control Rod Drive 2i
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High Pressure Coolant Injection (HPCI) /SI' 2
To provide an answer for (b), we refer you to Section 137, pages 52 and 53 of the USA Standard Code for Pressure Piping, B31.1.0 - 1967,)specifically calling attention to paragraphs 137 4.1 (a) and (b which state:
"(a) The test pressure for the piping shall not exceed the maximum test pressure of any vessels or components in the piping system.
"(b) 1Rie hydrostatic test pressure of a piping system shall be 1.5 times the design pressure unless a lesser pressure is indicated by Par.137 41 (a)."
The reactor pressure vessel to which all of the above listed piping systems are attached was designed and i
built to Section III of the ASME Boiler and Pressure Vessel y
Code.
The Code specifies that the hydrostatic test pressure for the vessel shall be 1.25 times its design pressure.
The attached piping systems, designed, fabricated and installed to comply with USA Standard B31.1.0 Piping Code, will likewise be hydrostatically tested at 1.25 times design pressure per i
paragraphs 137 4.1 (a) and (b) of B31.1.0.
Sincerely yours, i
W. B.
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Assistant to the President ECB/jan-merc'T W.
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