ML18026A326
| ML18026A326 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 02/26/1981 |
| From: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, ER-100450, ER-100508, PLA-641, NUDOCS 8103030812 | |
| Download: ML18026A326 (7) | |
Text
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ACCESSION~ NBR>81 0303081 2.
OOC.OaTKc. 81/02/26 NOTARIZED<
NO DOCKETI ¹ FACT '0:
87 Susquehanna Steam Electric=Stations, Unit-ii Pennsylva 05000387 0
38 usquehanna>>
Steam; Electric Stationr Unit 2i Pennsylva 05000388 T ;NAM AUTHOR AFFILIATION CBRTISE N s H ~
Pennsylvania Power.
8 Light Co, RECIP NAME>
RECIPIENT AFFILIATION GRIERr 1 ~ H ~
Region-fi Philadelphian Office of the Director" SUBJECTS Fina'1 deficiency 'r'ept. re: Anchor Oar ling valve: yoke: cr acking'g initial)y reported on-800707
~ Anchor Darling replacing a
affected parts w/priority given to Unit 1.Replacement scheduled for completion by May 1981- ~
DISTRIBUTION CCOE::
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P TWO NORTH NINTH STREEl', ALLENTOWN, PA. 18101 PHONES (215) 770 $ 151 NORMAN W. CURTlS tRce President-Engineering 4 Construction-Nuclear 770 5381 February 26, 1981 Mr. Boyce H. Grier Director, Region I-U., S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 af.BI) l'1AR O 2 1981>>
CCWAISSION SUSQUEHANNA STEAM ELECTRIC STATION FINAL REPORT OF A DEFICIENCY RELATING TO ANCHOR-DARLING VALVE YOKES ER's 100450/100508 FILE 840-4/900-10
~PLA-641
References:
PLA-505 dated July 7, 1980 PLA-511 dated July 21, 1980 PLA-551 dated October 27 1980 pear Mr. Grier:
This letter serves to provide the Commission with a final report relative to a deficiency involving cracked yokes on Anchor-Darling valves.
The condition was originally reported in PLA-505 and the information contained herein is submitted as a final report pursuant to the provisions of 10 CFR 50.55(e).
The attachment to this letter contains a description of the problem, its
- cause, an analysis of safety implications and the corrective action planned.
We trust the Commission will find the information forwarded by this letter to be satisfactory.
Very truly yours, N.
W. Curtis Vice President-Engineering 6 Construction-Nuclear Qo/ 7 I /i 20003tt g~g PENNSYLVANIA POW ~ E S LIGHT COMPANY
~ ~
Mr. Boyce H. Grier February 26, 1981 y ~
FLWssab Attachment cc Mr. V3.ctor Stello (15)
Director-Office of InsPection a Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. McDonald, Director Office of Management Information a Program Control.
U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Robert M. Gallo U. S. Nuclear Regulatory. Commission P.O.
Box 52 Shickshinny, PA 18655
SUBJECT U
Cracked yokes:- on Anchor-Darling Valves.
DESCRIPTXON OF PROBLEM A discrepant condition was noted on Valve 1F034D during functional testing of the RHR system by the Integrated Startup Group.and was documented on NCR 5980.
The condition observed on the subject valve involved the formation of large cracks in the four radii at the yoke mounting flange/yoke vertical section intex'face.
(See Figure 1 attached.)
This same condition was later noted on Valve 1F034C, although the degree of cracking was not as severe.
These valves wexe pux'chased under Purchase Ordex 8856-P-12A, from Anchor-Darling.
CAUS E The valve suppliex (Anchor-.Darling Valve Co.) has examined one of the cracked yokes and determined that the cause of failure was a materials problem.
The Bechtel Materials and Quality Services (MGQS) group verified the Anchor-Darling findings.
All yokes found cracked were furnished by a. common sub-suplier, Malcolm Co. Inc., for the Anchor<<Darling valves.
As the valve yokes are non<<pressuze boundary parts, no material traceability is reguired.
An investigation to determine the cause of the problem with Malcolm Co. castings is not possible due to the fact that Malcolm went out of business shortly aftex producing the yokes pxovided for SSES valves.
ANALYSIS OF SAFETY XMPLXCATIONS The Anchor'-Darling records indicate that a total of one hundred fifty-six (156) suspect yokes were supplied by Malcolm for SSES purchased valves.
The valves were supplied on Purchase Orders 8856-P10A, P12A and P17A.
One hundred
- fourteen, (114) of these are on active valves.
Anchor-Darling performed hardness tests on all affected yokes to determine the tensile strength of the material.
Thirty five (35) yokes exhibited hardness greater than the maximum'of ASTM-A-216-NCB (the specified material), forty three (43) exhibited hardness less than the minimum recpxized and seventy-eight (78) were within the allowable range.
A sample yoke was taken from each group (low hardness>
high hardness, medium hardness),
and was tested destructively (chemical and physical tests).
The results of these tests demonstrated that none of the material was WCB and was not suitable for valve yokes.
In addition to the above valve yokes, two additional items, important to valve function, were discovered to have been supplied by Malcolm.
These are a disc skirt for a 6" globe (6>>EBA<<GB-MO-F102-P; 1 for each unit, total 2 valves) and a disc skirt nut for a 24" globe (24-GBB-GBY-MO-F048A, Bt 2 for each unit total 4 valves).
0 R
Page 2
Based on the fact that the material is not suitable and the fact that its use on-active valves would cause loss of valve function, this problem is reportable under 10 CFR 50.55(e).
CORRECTXVE ACTlON Bechtel's MQQs took corrective action by evaluating all yokes furnished by Anchor-Darling for the Susquehanna Project.
Since all discrepant yokes were furnished by the sub-supplier, Malcolm Co., Xnc., who is now out of
- business, Anchor-Darling could take no further corrective action with that source.
All yokes and other items important to valve function, including the replacement yokes, will in the future, be purchased from a supplier which has proven ability topromde the specified material.
Anchor-Darling is proceeding to replace all of the affected parts with priority being given to Unit 1 first and Unit 2 last.
The replacement of the yokes and the disc skirt and disc skirt nut will be covered under Non-Conformance Report No. 5980.
The replacement is scheduled to be completed by May 1981.
CONCLUSION Replacement of the deficient parts with material from a qualified supplier will enable the valves to perform their intended function.
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