ML20125E441
| ML20125E441 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 01/07/1980 |
| From: | WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | |
| Shared Package | |
| ML20125E438 | List: |
| References | |
| NUDOCS 8002140073 | |
| Download: ML20125E441 (3) | |
Text
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O vf Attachment A WNP-1/4 l Docket Nos. 50-460 and 50-513 ;
Reportable Condition 10CFR50.55(e)
WKM Valve Cracks INTERIM REPORT
Background
B&W notified WPPSS on October 8,1979 of a defective condition which existed in the internal WNP-1/4reportability (pressure relief valve of this of the defect WKM evaluated is being manufactured valves being by B&W). Due tosupplied this for defect, all valves manufactured by WKM were shipped back to their factory in Houston for repair and WPPSS took this opportunity to perform the ASME Sec. XI visual exam of the large Sec. III, C1 1 valves in WKM's factory.
This examination revealed numerous linear indications in the conduit region of five (5) of the eight (8) valves examined and arc strikes on the gate and segment of six (6) valves.
Description of Deficiency Unacceptable linear indications were subsequently confirmed on six (6) of the eight (8) valves through the use of liquid penetrant examination. These valves are:
1-DHR-V23A and 248, and 4-DrlR-V23A, 24B, 25A, 26B. B&W and WKM also informed WPPSS of cracks which were detected in valve 4-CFS-V31A. These cracks were confirmed by
'WPPSS and the WPPSS ANI and found to be extensive . The cause of these problems is unknown; however, adequate inspection would have identified the conditions during the manufacturing process.
Safety Implications All rejectable indications and cracks found, to date, are in valves located in safety systems (Low Pressure Injection (LPI) and Core Flood System (CFS)). Failure of these valves in service due to a loss of pressure boundary integrity could result in; a) a loss of re6ctor coolant (DHR valves),
b) loss of borated water in the core flood tank c) an inability of the systems to mitigate the consequences of a LOCA type accident.
The subject condition also represents deficiencies as oescribed under both i and iii of 10CFR50.55(e).
Corrective Action Taken Since these valves h&ve already received an ASME N stamp, they fall under the juris-diction of ASME XI and WPPSS, as the Owner, has the responsibility for all future examination and repair.
4 soon4c o 73
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Attachment'A l Page 2- l l
Corrective Action Taken (Cont'd)
.B&W and.WKM are presently preparing the repair / inspection program for submittal to l WPPSS. The repairs and additional examinations will be performed by B&W and WKM '
.under WPPSS direction.
Further inspection on all WKM manufactured valves supplied to WPPSS is being I
planned'-
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VasnNCC); FG1.IC powtR SLT?LT ST5 TEM ncr._An. VASELS.~NH ,
509: 377-2740, Verify, It.07 FROM: P. P.. STEl!E - ITi- 2158
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12/19/79
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( h) FLUS REQUEST s m M: IF TIEE IS A FFO3 LEX DryaIgg i
T?.ANSMISSION 03 IF YOU Do No; EsczIyg C OM FC, FIZASE CALL (Sca) 3FA 5111, .
2742 OR EXT. 3711.
TEANK YOU......
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Teiere:rw: :So!.) 3M5111 tecerber 17. 1979 l
The Office of tne Director of Inspection and Enforceron:
U.S. Nuclesr T.cgvlatory Co. .ission Vashington, D.C. 20555 Attention: Mr. E. B. AlacLwood c.entleren:
, Pur.',uant with the re:;uirer=nts 'of ID CTP 21, this written report is a folloa-up of a vertai report msce at 1:50 PM, Decerber 14, 1979, to Mr. E. B. Blactuced by telecen concerning cefects in a ccre flood.
system isolation valve end possible defects in six (6) decay heat-recoval isolat. ion valves supplied to Washington Public Po.:cr Sucply Sys tems. Tne report was m:ce for Mr. J. H. Mac'4tilan Vico-Presicant, th: clear Power Generatior Division. Babcoch & Wilcox Corgany. Old forest Road, P. O. Sox 1260, Lynchburg, Virginia 2005, by O. !ars end T. L. Bald.<in of the Cormany's Licensing Section. : r. MacMillan was inforned of this reportaole concern at 8:20 Ati, Neember 14, 1979.
The report tras of two visual linear defects discovered by the tanufacturer inside the bocy of a core ficacing system isolation valve.
4CF-VIA su:: plied to Wasnington Public Power Supoly System by the W!;M -
Division of ACT Industries, houston, Texas, under B~.W Co:pany contract nu-ber 620-0032 for uni t W:;P .:. This valve had been returned to WrJ4 by VTPSS at our direction for rework of an internal relief valve. The report is t. ace under 10 CFR 21 of a defect in a basic coroonent used .to "ritigate the conse:;uences of acticents which cculd result in potential ef fsite exposures."
Additionally, the rep:rt covers unacceptable indications in six (6) de:ay heet removal system isolatica valves found by W?PSS by the ASME Secticn x! preservice baseline inspec .icn. rnese indications were roted by visual inspection and/cr penetrant tests in the inlet and outlet cenduits of the following isolation valves:
thi t WP 1 ' Unit V"P 4 D1 - V12A 4 Di - VilA Di - V123 A Di - VI:3 4 Di - V12A 4 Di - V123 The B >ttggt A WAet a C4 n:.,1hr / E.::a94Mc IE67 p a.
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Bab::ck LW.!ccx The Office of the Direct:r
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cf Inspect 1co' and Enforcerent Fege 2 Cecerber 17,1970 These indi:aticns are being rep:rted under 10 CFR 21 as pessible defects in basic c: ;:nents desicnec *; assure the integrity of the reactor ccolcnt pressure 5:un:ary". Tnese valves were aise su: plied to '.:FF55 by WC4 Divic. ion of ACf Incustries. H0uston, Texas unter BC Cc pany contracts 62C-0023 and 620-C332.
Ho 1.'rJi valves have been su: plied by Babcofk & }!ilcox Ccr;:any to any of our Operating Plants. B&W has supplied 4B valves e.:nufacturec by V01 for backlog centracts. They are:
e 2 decay heat cocler outlet control valves for Power -
Authority of the Stzte of ::ew York under c:ntract 620-0031
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- e 4 decay heet eccler cutlet contml valves for TVA under contract 623-0013 and 520-0016 - Eeilefonte Units 1 and 2 4 12 isola tion valves and 2 decey heat cooler control valves for Portland General Electric, under ecntracts
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- - E20-0024 and 520-0330 for Pebble Springs 1 and 2 r .
e 24 isolation valves and 4 decay heat eccler outlet centml valves supplied
. . b KFPSS on contract E20 0D23 and 620-0022 for 1GP 1 & 4 All custo.ers who art beina supplied WJ4 valves have been notified of this
[ ccncern and will be kept advised of the progress of inYestigations and selected fixes.
A pr gram is being d:veloped and . initiated by BC Co oiay,1lFP55, and WJ! to atter.:t to determine pr:ba le cause anc extent of trese defects and indica tions end.to deter .ine ac:cstibic fixes. The follo.o up ec icn plan vill includ assurance of t*:e acceptability of all 48 valves supplied to ELH Ccrpany contracts by WC;.
A list of the WC: valves supplied by BC with notatica cf the valves .
with d:fects or incications and a sketch snowing ccre ficod valve defcc!s are attacned.
Very trul '-:/ours 40 -
i Jarcs H. Thyler
. Ibnager, Licensing'
- JdT:ds f Attach.
cc: P.. D . O o rs um. (D C )
J. H. PacMillan (C W )
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ilKfl Valves with Possible Defects Valve Valve Item ,
Class' [hsi9 nation Sys tem / Plan t _ Defect f;oted Dy_
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m D2 cay licat Caic'U
- Class 1, DH - V12A Re.moval System DHR/ Unit 1 Visual and PT Discovered isolation Valycs by HPP55 Dll - V120 DIR/ Unit 1 PT-
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Class 1 4 DI - VllB OHR/ Unit 4 'Ilsual and PT
, VllA GIR/ Unit 4 Visual and PT ,
V12A DIR/ Unit 4 - Visual and PT-y , V12B . UlR/Unlt 4 Visual and PT
- Core 'F1 coding Case II C1 ass 2 4 CF - 1 A CF/ Unit 4 Visual 1incar j' j- Sys tem Isolation Discovered -
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cracks plus
, ;I, Valves by UKit , .
radiography .
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- g WKM Total Valve Count Dacklog Contracts '
!l . l . PASNY 2 - All decay heat cooler outlet control valves i ,. TVA 4 - All deccy heat cooler outlet control valves l
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- PGE 14 - 12 isolation valves + 2 decay heat cooler outlet controll valves
. r VIPP55 28 - 24 isolationi valves + 4 decay beat cooler outlet control valves 40 ilKl4 Valves O n b
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