ML20116F881
| ML20116F881 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 03/29/1985 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-340, REF-PT21-85-202-000 152, PT21-85-202-000, NUDOCS 8505010275 | |
| Download: ML20116F881 (4) | |
Text
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Cp&L Carolina P,ower,&, Light Company qgi r, u - r-i,
P. D. Box 101, New Hill, North Carolina 27562 March 29,1985 Dr. 3. Nelson Grace NRC-340 United States Nuclear Regulatory Commission Region 11 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT I PACIFIC SCIENTIFIC SNUBBERS MODELS PSA-1 AND PSA-3, ITEM 152
Dear Dr. Grace:
Attached is our final report on the subject item which 'vas deemed reportable per the provisions of 10CFR50.55(c) and 10CFR, Part 21, on November 8,1983. With this report, Carolina Power and Light Company considers this matter closed.
If you have any questiont regarding this matter, please do not hesitate to contact me.
Yours very truly, pff
==O
. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/ sac A ttachment cc:
Messrs. G. Maxwell /R. Prevatte (NRC-SilNPP)
Mr. R. C. DeYoung (NRC) l bbOO A
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CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO.1 FINAL REPORT PACIFIC SCIENTIFIC SNUBBERS MODELS PSA-1 AND PSA-3 ITEM 152 MARCH 29,1985 REPORTABLE UNDER 10CFR50.55(e)
REPORTABLE UNDER 10CFR21 i
i xex-SM2/2-oS5
SUBJECT:
Shearon Harris Nuclear Power Plant / Unit No.1,10CFR50.55(e) and 10CFR, Part 21, Capstan spring tang failure for mechanical shock arrestors.
ITEM:
Capstan spring component in mechanical shock arrestors.
SUPPLIED BY:
Pacific Scientific Company, Anaheim, California.
NATURE OF DEFICIENCY:
In September, 1983, Pacific Scientific Company, Anaheim, California advised Southwest Fabricating and Welding, Houston, Texas, purchaser for CP&L, of failure of four (4) PSA 1801102-05 shock arrestors.
Failure occurred during testing of Pacific Scientific Company's arrestors at Union Electric Callaway Station by Daniel International personnel.
The failed arrestors were returned to Pacific Scientific Company, where additional testing was performed on the failed components by "Mettek", Santa Ana, California. Results of the test have been issued in Mettek Report No. PSCl30911 dated September 14,1983.
DATE PROBLEM OCCURR ED:
Purchaser notified by letter September 21, 1983.
CP&L was notified by Southwest Fabricating and Welding by letter dated October 5,1983.
DATE PROBLEM R EPORTED:
November 8,1983 - CP&L (K. V. Hate') notified the NRC (A.
Hardin) that this item was reportab!c under 10CFR50.55(c) and 10CFR, Part 21.
SCOPE OF PROBLEM:
The deficiency involves 101 Unit i Type PSA-1 mechanical shock arrestors. Interim report dated January 23, 1985 Identified 102 shock arrestors. CP&L has performed an audit of our records and warehouse inventory and confirmed that 101 units were involved.
SAFETY
[MPLICATIONS:
The mechanical shock arrestors are required to ensure that pipe movement, acceleration, and displacement are contro!!cd within the design limits during a seismic event.
xEx-SM2/3-OS5 1
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REASON
. DEFICIENCY.
IS REPORTABLE:
l'ailure of the capstan spring tang would result in failure of the shock arrestor to function properly during a seismic event. This would result in the potential loss of operation of seismically designed piping during a seismic event.
CORRECTIVE ACTION:
Ninety-five mechanical shock arrestors identified by Pacific Scientific Company as being part of the identical lot and in critical systems of failed items ' vere returned to the vendor for capstan spring inspection and replacement as required. These snubbers were returned to SHNPP in late November. Six snubbers were sold to Vepco. They have been advised of the scope of the problem.
Pacific Scientific has informed CP&L that the manufacturer of the affected capstan springs has been made fully aware of the problem.
l They further stated that both the manufacturer and Pacific Scientific have taken corrective action to resolve this problem in the future.
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XEX-SM2/4-OS5