ML20106D517
| ML20106D517 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/15/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| ANPP-30854-TDS, DER-84-20, NUDOCS 8410260018 | |
| Download: ML20106D517 (4) | |
Text
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RECElyE9 mc Arizona Public Service Company
- . DCT 22.m ;o g (CORRECTED COPY)
October 15, 1984 D "*'lM ANPP-30854-TDS/TRB U. S. Nuclear Regulatory Commission Region V.
Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. ' T. W. Bishop,' Director Division of Reactor Safety and Projects
. Subject :
Final Report - DER 84-20 A 50.55(e) Reportable Condition Relating To Displacement Of A Connecting Line In the SI System.
File: 84-019-026; D.4.33.2 Ref erence: A) Telephone Conversation between T. Young and J. Cook on April 20,1984 B) ANPP-29531, dated May 17, 1984 (Interim Report)
C) ANPP-29973, dated July 16, 1984 (Time Extension)
D) ANPP-30277, dated August 20, 1984 (Time Extension E) ANPP-30478, dated September 11,1984 (Time Extension)
Dear Sir:
Attached is our final written report of the deficiency referenced above,
,which has been determined to be Not Reportable under the requirements of 10CFR50.55( e).
Very truly yours,
{
m na E. E. Van B runt, Jr.
APS Vice President Nuclear Production ANPP Project Director EEVB/TRB/nj At tachment
'cc See Page Two 8410260018 841015 PDR ADOCK 05000528 S
PDR 1lt IE47
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i Mr. T.~ W. - Bishop G
- DER 84-20 Page Two cc:-
Ric'hard DeYoung, Director Office of: Inspection and Enforcement
._ U. S. Nuclear Regulatory Commission Washington, - D. C.
'20555 T. G. Woods, Jr.
D. B. Karner W.'E. Ide D. B. Fasnacht
- A. ' C. Rogers
.L. A. Souza D. E. Fowler T. D. Shriver C. N. Russo J. Vorees J. R. Bynum.
J. M. Allen-A. lC. Gehr W. J. Stubblefield W..G. Bingham
'R. L. Patterson R. W. Welcher H. D. Foster D. R. Hawkinson R. P. Zimmerman-L. Clyde M. Woods-T. J.' Bloom D. N. Stover J. D. Houchen J. E. Kirby D. Canady Records Center.
Institute of Nuclear Power Operations 1100 Circle 75 Parkway,' Suite 1500 Atlanta,JGA' 30339 L
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4 FINAL REPORT - DER 84-20
~ DEF,ICIENCY EVALUATION 50.55(e)
ARIZONA PUBLIC SERVICE COMPANY (APS)
M PVNGS UNIT 1
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Description of Deficiency A misalignment resulted f rom disassembly of an already erected and
. operated piping system..
Line 01-SIB-030-HCBA-24" connects to the recirculation, sump and runs
.23'-8" horizontally through penetration sleeve 24 in the containment base wall, to flanged butterfly ~ valve IJ-SIB-UV-676. Line 01-SIB-308-GCBC-24" runs f rom the :other side of this valve,- past check valve IP-SIB-V-206, and drops 26'-3" to the LPSI pump suction. With bracing under check valve V-206, butterfly valve UV-676 was removed per NCR SE-3179. This resulted in a displacement
- to line SIB-030 of 1-3/8" down and 3/4" laterally. This exceeds the
' closure gaps allowed without engineering approval' by Specification
'13-PM-204. (Rev.13,. paragraph 8.5) f or erection of pipe spools. The F
condition was reported by SFR/NCR SM-3935.
A. survey of the line indicated that.the anchor point.at the recirculation sump liner plate is 1/8" low and the elbow downstream'of valve V-206 is 7/8" high, resulting in a one-inch vertical offset. Additionally, the 23'-8" length -of line SIE-030 was unsupported af ter being
~ disconnected f rom the butterfly valve. The sag due to the
' deadweight of the pipe was calculated.to be 1/8."
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. Evaluation The orig'inal' installation was within the toler.2nces of the l
installation' specification. The general topic of cold springing piping systems was addressed in the response to NRC Inspection Follow-up Item 5-528/83-02-03. Bechtel and APS review concluded that pipe installation at PVNGS is performed in accordance with
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approved procedures.:
_ The spool misfit procedure in Specification 13-FM-204 applies to the final closure fit up during erection of a piping system. It is not directly applicable to piping where random joints are released (cut or unbolted) af ter final closure was achieved. In such cases, there may be. residual. strains in the system due to weld shrinkage or support adjustments. This is a natural occurrence and is
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self-relieving with time. Additionally, after a system has been operated,. residual strains may remain in the system due to f riction in the restraints.. Any. complex high temperature piping system can be expected to experience misalignment if it is disconnected after final erection closure and operation. This misalignment does not e#
represent a spool closure misfit deficiency, but rather the existence of residual strains in the system.
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lSince.the' system in question had been fully erected and operated -
(bef ore: the flange.'at the butterfly. valve was disconnected, the -
famount of residual strain in the; system could only be determined by S
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a< systematic disassw.bly'of-the piping'and supports. Jecause.
~ disassembly is not practical, the resulting micalignment has been
- 'i evaluated as 'if it were a final closure misfit - Even with this 1
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ass'urytion, the resulting calculated stresses (calculation a 13-HC-SI-502A) _ in ' the piping system are within acceptable limits and the stress (196. psi) ar.. the butterfly valve will not impair its r, l.
operation?
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, II. i Analysis of ' Saf etsImplictsions l'
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4 Based on the -above discussi$n, this condition, if lef t[ncorrected,
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1 would not adversely affect thaf' safety of olyirations-of t the plant; consequently, this conditior4s ' evaluated as not reportable under r
the r'equirements of 10CFR50.55(e)~ or 10CFR Part 21..
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III. Corrective Action i
'SFR/NCR EM-3935 was dispositioned use-as-is.'
The proper operation of valve IJ-SIB-UV-676 was verified af ter reassembly ar,. part of the dispoittion of SFR/NCR SE-3179.
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IV.
References f
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. Crocker, : Sabin; Piping Handbook, Fif tX.. Edition, pp. 4-72 through'4-79. McGraw-Hill, Inc. (New York)
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