ML20083P389
| ML20083P389 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 01/07/1983 |
| From: | Liddle A, Ricapito R GENERAL SIGNAL CORP. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-83-753-000 PT21-83-753, PT21-83-753-000, NUDOCS 8302030467 | |
| Download: ML20083P389 (4) | |
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January 7, 1983 Director, Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, DC 20055
Subject:
Nuclear Regulatory Commission Regulation 10 CFR Part 21 Reporting of Defects and Noncompliance Re:
Catawba Nuclear Station - Units 1 6 2 SC Highway 274 Newport, SC 29710 c/o Duke Power Co.
422 South Church St.
P. O. Box 33189 Charlotte, NC 28242 Gentlemen:
The purpose of this letter is to inform you that B I F, A Unit of General Signal, 1600 Division Road, West Warwick, RI 02893, has discovered a defect pertaining to six ASME III-3 butterfly valves supplied to the above-referenced nuclear power plant.
The defect consists of a mathematical error in the seismic report for referenced valves, resulting in an undersized actuator mounting plate.
The error adversely effects the safe shutdown earthquake operability of the six units. Deflection of the actuator mounting plate during an SSE event could cause binding between the actuator and the valve shaft resulting in the inability to open or close the valve.
The above error does not effect the pressure boundry integrity of the valves bring normal or SSE operation.
It should be,~noted that this mounting, bracket arrangement and seismic report jwas designed for only these six '8" butterfly valves on Duke Power application.
/ No other valves with this arrangement have been shipped to any other nuclear power plant.
To meet the intent of NRC regultion 10 CFR Part 21, B I F confirms that this is not a." generic" design problem.
Upon notification, Duke Power has determined that this error will create a substantial safety hazard.
The correctiva action consists of replacing the inadequate actuator mounting plates with heavier ones.
8302030467 830107
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Director, Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission January 7, 1983 Page.
A copy of B I F's January 4, 1983 letter notifying Duke Power of this defect is attached for your reference.
Should you have any questions or further requirements concerning the above, please contact the undersigned at (401) 885-1000.
Sincere?y,
,/9/97 Richard Ricapito V Design Supervisor Nuclear Butterfly Valves Approved by:
RM. N A. H. Liddle Sr. Vice President, Engineering B I F. A Unit of General Signal Attachment l
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BIF ALJNe7OPGENERALStGNAL January 4,1983 Duke Power Co.
422 South Church St.
P.O. Box 33189 Charlotte, N.C. 28242 Attention: Mr. S.K. Blackley c/o Mr. 'R. Oakley
Subject:
Catawba Nuclear Station - Units 1 & 2 Misc. ASME Section III Butterfly Valves
' Specification CNS-2305.02-4 MPS Co. P.O. C-23599 Re: 8 in. BIF Butterfly Valves with Electric Actuators for A'tive Service. Seismic Report No. N53653 Rev. E.
c 1.
Duke Item No. 2B-378:
BIF S.N. N68159-1 (At Catawba Site) 2.
Duke Item No. 28-378:
BIF S.N. N53652-1,-2,-3.-4, & -5 (At Catawba Site) 3.
Duke Item No. 28-378:
Gentlemen:
The purpose of this letter is to inform you that B I F has discovered an error in approved Seismic Report No. N53653 Rev. D.
The. error is in the bracket plate analysis found on page 5.3.9. of the above report.
You'll note that the bracket plate is described as ".44 thick SA515 GR70" and that further down in the section modulus equation. 60 is used.
Unfortunately, when the correct thickness of.44 is used the resulting load of 40925 psi exceeds the 23958 psi allowable.
B I F recommends that the bracket plate thickness be.75 SA515 GR70 plate and has revised and resubmitted (attached) the corrected pages of the Seismic report for reference.
Please insert the corrected pages into your copy of Report No. N53653 Rev. D.
With the insertion of the correct pages, the report becomes N53653 Rev. E.
Your acknowledgement and approval of this report will be required to make our documentation complete.
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\\_ o c9 1600 DIVISION AC AO. WEST WA AWICK. Al O2893. BOX 217 401 -885-1000 CABLE: BIF W AWKAl TWX 710-382 0402. TELEX 92 7 631 0
5' DukePowerCo.(Cen't)
Page 2 1/4/83 B I F wishes to advise Duke Power that the above error adversely effects only the SSE operability of the subject valves.
The 40,925 P.S.I. load exceeds the 38,000 P.S.I. yield point of SA515 GR.70 plate, therefore, deflection of mounting plate during an SSE event could cause binding between the actuator and the valve shaft resulting in the inability to open or close the valve. The above error does not effect the pressure boundry integrity of the valve during nomal or SSE operation.
It should be noted that this mounting bracket arrangement and Seismic report was designed for only these 8 inch butterfly valves on Duke Power application.
No other valves with this arrangement have been shipped to any othar nuclear power plant.
To meet the intent of NRC regulation 10 CF1RPart 21, B I F confirms that this is not a " Generic" design problem.
B I F request that Duke Power evaluate the function of item 28-378 to detdrmine if the subject error will create a substantial safety hazard.
Should Duke Power decide that NRC regulation 10 CFR Part 21 is applicable, then Duke Power should advise B I F accordingly.
As for"the required actual material changes, B I F offers the following:
1.
Item 2B-378, BIF S.N. N74166-1 is still at B I F and the new.75 thick plate has been provided.
2.
Item 28-378, BIF S.N. N68159-1 and N53651-1,-2,-3,-4 & -5 are at the job s'ite.
B I F would like to make arrangements to have a B I F Serviceman make the necessary corrections at the job site.
The corrective action consist of removing the actuator and replacing the.44 thick mounting plate with a new.75 thick one.
Please contact the undersigned to implement corrective action or for additional information.
B I F apologizes for any inconveniences caused by this error.
Your cooperation in this matter will be appreciated.
Ver truly yours,
- 4-Richard Ricapito/mh Design Supervisor l
Nuclear Butterfly Valves cc:
B. Cox D. Cyronak i
J. MacDonald l
H. O'Brien PLOF H53652 l
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