ML20244D168

Forwards SER Re Application of leak-before-break Technology as Alternative to Providing Protective Devices Against Dynamic Loads Resulting from Primary Loop Pipe Ruptures.Justification Acceptable

ML20244D168
Person / Time
Site:	Seabrook, 05000000
Issue date:	01/18/1985
From:	Johnston W Office of Nuclear Reactor Regulation
To:	Novak T Office of Nuclear Reactor Regulation
Shared Package
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References
FOIA-87-51 GL-84-04, GL-84-4, NUDOCS 8501290693
Download: ML20244D168 (2)

Text

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7 JAN 181925 l'

Docket Nos.

50-443/444 MEMORANDUM FOR:

Thomas M. Novak, Assistant Director for Licensing Division of Licensing FROM:

William V. Johnston, Assistant Director Materials, Chemical & Environmental Technology Division of Engineering

SUBJECT:

SEABROOK, UNITS 1 AND 2 - ELIMINATION OF LARGE PRIMARY LOOP PIPE RUPTURES The Materials Engineering Branch, Division of Engineering, has completed its technical review of the Public Service Company of New Hampshire (PSNH) submittal regarding the application of the " leak-before-break" technology as an alternative to providing protective devices against the dynamic loads resulting from postulated ruptures of the Seabrook facilities primary coolant loops.

We find that the primary coolant system piping geometry, materials, and loads are very similar to and within the envelope of those evaluated in Generic Letter 84-04, " Safety Evaluation of Westinghouse Topical Reports Dealing With Elimination of Postulated Pipe Breaks in PWR Main Loops." We conclude that PSNH has provided technical justification for not providing protective devices against the dynamic effects of postulated pipe breaks in support of its request for exemption from a portion of the requirements of' General Design Criterion 4 of Appendix A to 10 CFR Part 50.

Our Safety Evaluation is attached.

//.i William V. Johnston, Assistant Director Materials, Chemical & Environmental Technology Division of Engineering

Attachment:

As stated cc:

See Page 2

Contact:

K. Wichman X-24679

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JM 1 S 1585 Thomas M. Novak cc:

R. Vollmer D. Eisenhut J. P. Knight G. Knighton B. D. Liaw R. Bosnak E. Sullivan

5. Pawlicki V. Nerses K. Jabbour R. Klecker W. Hazelton C. Y. Cheng K. Wichman

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