ML20085C180

Responds to 690506 Ltr Re Region III Rept Concerning Plans for Testing Certain Piping Sys.Nuclear Sys to Be Tested Listed

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: ML20085C180 ML20085C223
References
92710, NUDOCS 8307090208
Download: ML20085C180 (3)

Text

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. Commonwealth Edison Company 72 WEST ADAMS STMEET .CM8CAGO. ILL9NOIS SOS 90 4

June 2, 1969 1

Mr. Lawrence D. Low, Director y Division of Compliance. i ty ,

t U.S. Atomic Energy Commicsion Washington, D.C. 20545 1 " '"JP/

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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 i d Vain Steam 101 '~ % g s3 (W '

h[k' Extraction Steam =O/ W A P~ 2' W /~) .

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l g p,, tt.n. L Reactor Feed = v*u =12f*% : W L- , IV i- Reactor Recirculating - ,2 r 4. M .n4 44 y_ Core Spray = v.<. J =or y it n) z c'a /

• py. s f Isolation Condenser : i// f gc , yo Low Pressure Coolant Injection (LPCI) > 9, e #

Reactor Cleanup' gg g-7 9 27'u i

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Mr. Lawrence D. Low June 2, 1969 Systems Shutdown Reactor Cooling Standby Liquid Control

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High Pressure Coolant Injection (HPCI) /SI' To provide an answer for (b), we refer you to Section 137, pages 52 and 53 of the USA Standard Code for Pressure to paragraphs Piping, 137 B31.1.0 - 1967,)specifically 4.1 (a) and (b which state: calling attention

"(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 i

be hydrostatically tested at 1.25 times design pressure per paragraphs 137 4.1 (a) and (b) of B31.1.0.

Sincerely yours, i -

W. B. ehn e l

Assistant to the President ECB/jan-

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