ML20212M249
| ML20212M249 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 01/23/1987 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Harold Denton, Tam P Office of Nuclear Reactor Regulation |
| References | |
| 2NRC-7-012, 2NRC-7-12, TAC-62873, NUDOCS 8701300053 | |
| Download: ML20212M249 (2) | |
Text
e u
fes
+
2NRC-7-012 Beave Va No. 2 Unit Project Organization Telecopy ( 2) 3 Ext.160 P.O. Box 328 January 23, 1987 Shippingport, PA 15077 Mr. Harold R. Denton Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Mr. Peter Tan, Project Manager Division of PWR Licensing A Office of Nuclear Reactor Regulation
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 PSI Progran, SER Open Iten (4) (a)
F,EFERENCE:
1)
DLC Letter 2NRC-5-154, dated December 26 1985 2)
DLC Letter 2NRC-6-034, dated April 9,1986 3)
DLC Letter 2NRC-6-047, dated May 13, 1986 Gentlemen:
Continuing the dialogue regarding the BVPS-2 Preservice Inspection Progran submittal (reference 1) and the request for confinnatory status for the part of SER Open Iten 4 regarding PSI (reference 2), a telecon between Duquesne Light Company (Messrs. J. Szy Slow Ski and R. Reba), and your staff (Messrs. P Tan and G. Johnson) was held on December 3,1986.
The topic of discussion was an enhancenent to the Support Progran regarding multiple strean selection of can-ponent supports during PSI.
In a previous discussion (Iten 2 of reference 3) and reaffinned in the telecon, it was estaolished that mul tiple streaning, IWF-2510(b) could be appl ieu curing PSI for both piping and other couponents such as vessels and punps.
DLC reaffinns its agreement that all supports associated with welded integral attaciunents in Class 1 piping would be exanined.
Otherwise the words provided by the reference indicated that in the application of " multiple strean (train)" criteria to multiple conponents, only the supports of one of the conponents was required to oe exanined, and in its application to multiple pip-ing runs, only tne supports of one of the piping runs was required to be examined.
The progran enhancenent DLC proposed during the telecon and mutually agreed to was that in the case of piping, multiple streaning should not be limited to one strean, but instead, an approximately equivalent single strean of support exaninations should be spread out over all streans providing a simi-lar function.
DLC also recognizes that the geonetry of installed piping may not be sane in all streans of the sane function.
In such cases where supports in one strean could not be matched with supports of the sane function, and in a similar location in other streans, it would be treated like a singular strean 8701300053 870123 0
h,.0 PDR ADOCK 05000412 E
poa
United States Nuclear Regulatory Commission Mr. Harold R. Denton, Director PSI Program SER Open Iten (4) (a)
Page 2 application, thus resulting in the code mandatory exan for a single strean installation.
This approach is tenpered with an elenent of conmon sense in that for instance:
spring hangers located near the center of two different runs of piping could be equated to each other even if one is located on a vertical run of piping, and the other is located on a horizontal run, because the function is the sane; or that a restraint-snubber support sequence on one strean versus a snubber-restraint sequence on another strean in similar areas and orientations of piping could be seen as equivalent appl ications.
(Regarding snubbers, multiple streaning is applied to the support steel only, as 100% of the safety related snubbers thenselves are inspected.)
In regard to l
choosing one sister strean support equivalent over a similar application in another strean, access by ladder versus erection of scaffolding may be a detennining factor in making the final selection.
Again, if no equivalent support application existed, exanination would be necessary.
As a follow-up to the telecon, it is noted that the selection of supports for exanination under IWF is independent of where or how many exaninations were selected under IWB or IWC (This is particularly appropriate for piping where a support may not necessarily be in the vicinity of a piping weld selected for examination, or representative of all supports [.
DLC procedures will reflect that supportk considered as candidates for exanination would be supports of those Class 1,\\2 and 3 conponents which were thenselves candidates for exanination. However, selection of specific supports for exanination fran anong the support candidates would be done utilizing the enhanced multiple streaning technique described above independent of where IWB and IWC exaninations fell.
IWD exaninations are detennined as a function of IWF selections.
OLC intends to follow the direction as agreed upon and explained above regarding the BVPS-2 PSI support exaninations.
DUQUESNE LIGHT COMPANY
^
J. WCatfy D
Sr. Vice' President JJS/iJr
~
NR ET/SO412 AR cc:
Mr. P. Tam, Project Manager (w/a)
Mr. J. Beall, NRC Sr. Resident Inspector (w/a)
INP0 Records Center (w/a)
NRC Document Control Desk (w/a)