ML19289C203

Requests Addl Info for Mechanical Engr Branch,Sec A,Postulated Pipe Breaks Inside Containment & Examination of Welds.List of All Info Sought Encl

ML19289C203
Person / Time
Site:	05000584
Issue date:	12/11/1978
From:	Heltemes C Office of Nuclear Reactor Regulation
To:	Gogolick C GIBBS & HILL, INC. (SUBS. OF DRAVO CORP.)
References
NUDOCS 7812140358
Download: ML19289C203 (2)

Text

,n.

c UNITED STATES

~

j

-'4 NUCLEAR REGULATORY COMMISSION f, s:,*.

. j A

WASHINGTON, D. C. 20555

%'hu}hl2

...I. '

OEC a 11978 Docket No. STN 50-584 Mr. Charles Gogolick GIBBSSAR Project Manager t

Gibbs & Hill, Inc.

393 Seventh Avenue New York, New York 10001

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - ROUND TWO QUESTIONS Enclosed are requests for additional infomation that is needed in order to continue our review; these questions supplement the round two questions and positions by Mechanical Engineering Branch trans-l mitted to you by letter dated August 14, 1978.

i We need a completely adequate response to all round two questions /

positions in the mechanical engineering area by January 15, 1979, in order to be consistent with the schedule.

Sincerely, C

. Heltem

, Jr., Chief Standardization Branch Division of Project Management Office of Nuclear Reactor Regulation

Enclosure:

Supplemental Q-2's by MEB cc w/ encl:

Mr. Fredrick Gettler, Vice President Power Engineering Gibbs & Hill, Inc.

393 Seventh Avenue New York, New York 10001 781214035d1

DEC 111978 111-1 111.0 MECHANICAL ENGINEERING BRANCH, SECTION A 111. 55 Section 3.6.2.1.2 (page 3.6-6) of the SSAR adopts Branch (3.6.2.1)

Technical Position MEB 3-1 as the basis for determining postu-lated pipe break locations in high energy piping systems outside containment. An element of this BTP (position B.l.b) is the establishment of criteria for piping in the containment penetration area where pipe breaks need not be postulated.

Unfortunately all the criteria are not contained in the BTP.

Therefore, commitment to the BTP is not sufficient, in and of itself, if pipe breaks are not to be postulated in the contain-ment penetration area.

t Therefore, it will be necessary to expand section 3.6.2.1.2 l

of the SSAR to indicate that either:

I (1) Pipe breaks will be postulated in the containment penetra-tion area using the criteria of positions B.1.c and B.l.d; or (2)

In addition to meeting the criteria of position B.l.b, all piping in the containment penetration area will have a 100 percent volumetric examination of all circumferential and longitudinal welds during each inspection interval (IWA-2400ofSectionXIoftheASMECode.)

I 111. 56 i.

The third paragraph of Section 3'6.1.1.a. (page 3.6 2) of the (3.6.1.1)

SSAR references portions of Section 3.6.2.1.2 which have been deleted.

Revise this paragraph to reference BTP MEB 3-1 directly.

i

,