ML20010E222
| ML20010E222 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 08/27/1981 |
| 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, PLA-916, NUDOCS 8109030215 | |
| Download: ML20010E222 (2) | |
Text
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yy y MB Pennsylvania Power & Light Company Tv.o North Ninth Street
- AUento/.n. PA 1P101 + 2i5 < 770 5151 Norman # Curtis
%co Picsident-Eng.ncenng & Construction-%ciear 215 / 770-5331 August 27, 1981 Mr. Boyce H.
Grier Director, Regien I
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!!uclear Regulatory Comission
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SUSQUEHA!;::A o.EAM ELECTRIC 5" ATIO!;
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Reference:
PLA 654 (3/11 '91)
Dear Mr. Grier:
The referenced letter described a condition involving the failure of Mark Controls Corporation / Pacific swing check valves. The deficiency repcrt was based upon the discovery of excessive wear at tue hinge arm /
disc stud interface of some non 'Q' check valves. The valve discs were noted to jan behind the hinge arns thus preventing proper closure.
Additionally, the wear was noted as a cause of the disc failing to seat tightly, thereby allcwing a leak path by the valve seat.
The condition was reported based on similarities of ca tings and material between the 'O' and non 'Q' purchase orders for check valves purchased under Bechtel P.O.
P-12BC and P-22B respectively in conjunction with the reported discovery of a defective 'Q' check valve on site.
The report of a defective 'Q' check valve on site proved to be erroneous.
Inspections of selected 'Q' valves of similar size, class and having similar installation configurations as the defective non 'Q' valves revealed no evidence of a similar wear condition as was identified on the non 'O' check valves.
Based on the activities described above which support a conclusion that the identified deficiencies do not exist in 'Q' valves, PP&L has concluded reportable condition is no longer considered to exist.
The wear that a problem appcars isolated to non 'Q' check valves. The imposition of a formal QA/QC program during the manufacturing, inspection and testing process is identified as unique to the 'Q' valves and is considered as basis for the deficiency being limited to non 'O' valves.
An inspection of 'Q'-listed check valves after fuel load has been planned.
This inspection will insure that if future wear problems do develop on the 'O' check valves, they will be detected and pr ptly corrected.
8109030215 810827 PDR ADCCK 05000387 S
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Mr. Boyce H.
Grier August 27, 1981 We trust Comnission will find our conclusion acceptable.
Very truly yours, N.
W.
Curtis Vice President-Engineering & Constraction-Nuclear FLW:jnk cc:
!r. Victor Stello (15)
Direct'r-Office of Inspection & Enforcement U.
S.
- uclear Regulatory Ccmnission Washington, D.C.
20555 Mr.
G.
McDorald, Director (1)
Office of Management Information & Program Control U.
S.
Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Gary RP ) ads U.
S.
Nuclear Regulatory Comnission P.O.
Box 52 Shickshinny, PA 18655 I
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