ML19316A047
| ML19316A047 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/17/1973 |
| From: | Schwencer A US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Thies A DUKE POWER CO. |
| References | |
| NUDOCS 7911210612 | |
| Download: ML19316A047 (3) | |
Text
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RSBoyd RCDeYoung Docket Nos. 50-26 JAN 1 7 1973 DSkovholt 50-270 FSchroeder and 50-287 RRMaccary DKnuth RTedesco HDenton PWR Baanch Chiefs Duke Power Company ATTN: Mr. A. C. Thies Senior Vice President Production and Transmission P. O. Box 2178 Charlotte, North Carolina 28201 Centlemen:
Please refer to our letter to you, dated December 15, 1972, regarding the analysis of postulated pipe failures outside of the containment struc'ture. Enclosed are errata items for your additional guidance.
If you have questions regarding this new material, please contact us.
Sincerely, Orignal Signed by Albf ;thweneer A. Schwencer, Chief Pressurized Water Reactors Branch No. 4 Directorate of Licensing
Enclosure:
i Errata Sheet l
cc w/ encl:
William L. Porter, Esquire l
Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28201 M
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o ERRATA SHEET FOR " GENERAL INFORMATION REQUIRED FOR CONSIDERATION OF THE EFFECTS OF A PIPING SYSTEM BREAK OUTSIDE CONTAINMENT" i
The following lists the changes that have evolved on our initial information request:
1.
Page 2, Item 2--Insert the following in 2. to precede the existing first sentence:
" Design basis break locations should be selected in accordance with the following pipe whip protection criteria; however, where pipes carrying high energy fluid are routed in the vicinity of structures and systems necessary for safe shutdown of the nuclear plant, supplemental protection of those structures and systems shall be provided to cope with the environ-mental effects (including the effects of je:
impingement) of a single postulated open crack at the most adverse location (s) with regard to those essential structures and systems, the length of the crack being chosen not to exceed the critical crack size. The critical crack size is taken to be 1/2 the pipe diameter in length and 1/2 the wall thickness in width."
2.
Page 2, Item 2(a)(2)--Change nomenclature to read "any intermediate 1ctations between terminal ends where the primary plus secondary stress intensities Sn... "
3.
Page 4, Item 2. (b)(2)--Change 0.9 (Sh
- S ) to 0.8 (S
+S).
A 4.
Page 6, Item 7 --Add " structural" to read "The structural design loads..."
l S.
Page 7, Item 11.(a)--Add " required" so as to read, " Loss of required redundancy..."
6.
Page 7, Item ll.(a)--Delete "the steam line break" and replace with "that" to read "...the consequences of that accident..."
l 7.
Page 8, Item ll.(b)-- Replace (b) with the following: (b) " Environmentally induced failures caused by a leak or rupture of the pipe which would not of itself result in protective acticn but ooes disable protection functions.
In this regard, a loss of redundancy is permitted but a loss of function is not permitted. For such situations plant shutdown is required."
o o
r.
O 8.
Page 8, Item 13--Change wording in the first sentence to read
" Environmental qualification should be demonstrated by test for that electrical equipment required to function in the steam-air environment resulting from a high energy fluid line break."
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