ML20058L053
| ML20058L053 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 11/11/1975 |
| From: | Day B, Mayer L NORTHERN STATES POWER CO. |
| To: | Boyd R Office of Nuclear Reactor Regulation |
| References | |
| LER-LER-751111, NUDOCS 9105070369 | |
| Download: ML20058L053 (1) | |
Text
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LICENSEE EVENT REPORT CCNT ACL BLCC< l_
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[PLE ACE PRINT LL RECUIRED INFORM ATION) 1 6
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l lj 1 l 1 l l j 7l 5l 7 8 57 58 59 00 61 68 69 74 75 80 EVENT DESCAiPTION
@l Du rinc cold shutdown, crack discovered in 1-inch inlet nipple to RV 2005, B Loop l 7 89 gg 0
i T.PC T relie f valve.
Relief valve located on isolable section o f pipe.
A Loon l
7 89 80
@l LPCI available and operable at time of occurrence.
Component modification complei 7 89 eo O
l red.
(AO-263/75-22) l 7 89 go 0
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7 63 go m,y,
- vS?EV CAmSE COM'*CNf NT CDMAONENT
.CCCE L.C C E COVNNENT CODE S#at e n vaNu AC?uFen w oun ten r
Cl7 l9 l Fl l VlA l1 l Vl ElX l lAl lF l0 l3 l 5 l W
7 39 10 11 12 17 43 44 47 4d CAUSE CESCAIPTION 99 l Farris Engineering Corporation, Model 1741, Welding Nipple Series, Relief Valve.
l 7 89 ao EE ! 't% inter ninole cracked because of excess cyclic movement induced by un res t rained l 7 89 80 DE l relief valve discharge line.
Inlet connection stress reduced by modifying dischargq 7 89 80 F AC:u'y vf'a00 05 S'A'LS
% Pc A E m O'sfa STATUS
'J 5CO vE nv D 5CC6 tD* DE SC A PfiCN d
l0 l 0 l 0 l lNA l [
l Routine Operator Inspection l
1 7 8 9
10 12 13 44 45 46 80 rCav or AC TPg;T y CON?[NT LE E A SE D 08 HELE ASE AMOUN? Cf ACTviv LOC Af!ON Cr phE ASE b
7 8 9
10 11 44 45 80 PEASONNEL EXPOSURES NvMBER T v PE CESCAip90N BE 10l0101 O l NA i
7 89 11 12 13 60 PE ASONNEL INJUA;ES NJUBE R CE 5CRict*CN El l0l0l0l l NA l
7 89 11 12 60 CFFSITE CCNSEGLENCES ll l SA l
7 89 80 LOSS OR DAMACE TO FACILITY T,sE ct sCn4p':cs 1 16 QA l
7 89 10 80 PUBLICITY l NA l
1 7 89 t4C ADD 4TICNAL rACTC AS E l Cause Description (Con't.) line and inlet connection.
l 7 89 80 3l l
7 89 80 B.
D.
Day 612/295-5151 NAME.
PHONE 9105070369 751111
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y NSF NORTHERN 5TATES POWER OOMPANY m ~ ~ e A po u e. w is u r e ova esAoi November 11, 1975
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o Mr. R. S. Boyd, Acting Director D1. vision of Reactor Licensing U. S. Nuclear Regulatory Corsnission Washington, DC 20555
Dear Mr. Boyd:
MONTICELLO NUCLEAR GENERATING PIANT Docket No. 50-263 License No. DPR-22 I
Crack in LPCI Relief Valve Inlet Line The Licensee Event Report for this occurrence is reproduced on the back of this letter.
Yours very truly, hs W
/
L. O. Mayer, PE
/ j Manager, Nuclear Support Services V
LO'!/ WJ4/de b cc:
J. G. Keppler G. Cha rne f f MPCA Attn:
J. W.
Pe rman
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