ML20058L662
| ML20058L662 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 01/16/1973 |
| From: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Dienhart A NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9106100531 | |
| Download: ML20058L662 (3) | |
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4..; o o ERRATA SHEET FOR "CENERAl. INFORMATION REQUIRED FOR CONSIDERATION OF Tile EFFECTS OF A PTPING SYSTEM llREAK OUTSIDE CORTAINMENT" 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 environmental effects (including the effects of jet impingement) of a single postulated open crack at the most adverse location (s) with re ard 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. Pace 2, item 2(a)(2)--Change nomenclature to read "any intermediate locations between terminal ends where the primary plus secondary stress intensities S... n= 3. Pace 4, Item 2. (b) (2)--Change 0.9 (S. + S ) to C.8 (5h+S). n A A 4. Page 6, Item 7--Add " structural" to read "The structural design loads..." 5. Page 7, Item 11.(a)--Add " required" so as to read, " Loss of recuired redundancy..." 6. Pape 7, item Il. (n)--Delete "the steam line break" and replace with "that" to read "...the consequences of that accident..." 7. Pam 8, It.m 11.(b)--Replace (b) with the following-(b) "l:nvi ronuent al J y induced failures caused by
- le.4k or r:spts.re of the pipe which would not of Itteelf result in protective cction out does disa'>Ie protectio.a functions.
In this regard, a loss of redundancy is per=itted but a loss of function is not permitted. For such situations plant shutdown is required."
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b I p.l' ; m l:rrata Sheet Fo_r "Genern1 1_nformatton Hequired For Consideration Of Tl_!c Effects Of Piping System areak Outside Containment" i l l 8. Page 8, Item 13--ChanEc 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 4 environment resulting from a high energy fluid line break." l i l f i I l l l ~ ~* ~ ~ 2 . _m m en}}