ML19312C392
| ML19312C392 | |
| Person / Time | |
|---|---|
| Site: | Oconee, Mcguire, McGuire  |
| Issue date: | 06/27/1978 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7912130918 | |
| Download: ML19312C392 (2) | |
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In Reply Refer To:
RII:JPO 50-369, 50-370 50-269, 50-270 50-287 Duke Power Company Attn:
Mr. William O. Parker, Jr.
Vice President, Steam Production P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 Gentlemen:
Enclosed is IE Bulletin No. 78-10 which requires action by you with regard to your power reactor f acility(ies) with an operating license or a construction per: cit.
Should you have questions regarding this Bulletin or the actions required of you, please contact this office.
Sincerely, Y
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James P. O'Reilly Director
Enclosures:
1.
List of IE Bulletins Issued in 1978
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JUN : 71978 Duke Power Company cc w/ancl:
J. C. Rogers, Project Manager McGuire Nuc'.aar Station P. O. Box 2178 Charlotte, North Carolina 28242 M. D. McIntosh, Plant Manager McGuire Nuclear Station
- 7. O. Box 488 Cornelius, North Carolina 28031 J. E. S=ith, Station Manager Oconee Nuclear Station P. O. Box 1175 Seneca, South Carolina 29678 1
UNITED STATES NUCLEAR FIGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 June 27, 1978 IE Bulletin No. 78-10 BERGEN-PATERSON HYDRAULIC SHOCK SUPPRESSOR ACCUMULATOR SPRING COILS i
Description of Circumstances:
During the conduct of hydraulic shock suppressor (snubber) functional testing and seal replacement programs at several licensed facilities, a number of broken accumulator spring coils have been found in early model Bergen-Paterson hydraulic snubbers. The attached extract from a Bergen-Paterson advisory letter, dated April 6, 1978, states that a broken accumulator spring alone would not render the snubber incapable of performing its design function; however, the broken spring could cause internal damage to the accumulator which could result in unit inoperability.
The subject snubbers are of the external pipe design with serial numbers 487,000 to 515,000 and F60,635 through F75,000. The accumulator springs in these snubbets are basically carbon steel and were coated with a petro-chemical vust preventative by the vendor. Despite this initial protective coating, those springs found broken exhibited advanced stages of corrosion. The factors which caused the spring corrosion are undetermined.
Bergen-Paterson has recocmended that corrosion susceptible accumulator spring coils be replaced with teflon coated or stainless steel coils during the next refueling shutdown.
Action to be Taken by Licensees:
j For all power reactor facilities with an operating license or a construction permit:
1.
If you have received the enclosed Bergen-Paterson letter l
addressing the accumulator spring problem, and if you have these units installed or in ready spares at your facility, it is requested that you describe what corrective action you have taken or plan to take to assure that the operability of snubbers in safety related systems is not impaired.
It is also requested that you describe the condition of anv cnrinne * *
- e observed during t DUPLICATE DOCUMENT Entire document previously entered b (>
nto syster under:
O 0/b?3f 350 m a p g ANO mc No. of pages:
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