ML20129G035
| ML20129G035 | |
| 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-346 102, NUDOCS 8506070116 | |
| Download: ML20129G035 (4) | |
Text
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P.O. Box 101, New Hill, N.C. 27562 March 29,1985 Dr. 3. Nelson Grace NRC-346 United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1 GREASE IN FRICTION TYPE STRUCTURAL CONNECTIONS, ITEM 102
Dear Dr. Grace:
Attached is our fif th interim report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e), on April 26,1983. CP&L is pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomplished by May 10, 1985.
Thank you for your consideration in this matter.
Yours very truly, g
1 ' ^ 2 2s R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/bs Attachment cc:
Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) hDR A
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e CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO.1
.i FIFTH INTERIM REPORT GREASE IN FRICTION TYPE STRUCTURAL CONNECTIONS ITEM 102 March 29,1985 REPORTABLE UNDER 10CFR50.55(e)
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SUBJECT:
Shearon Harris Nuclear Power Plant / Unit No.1,10CFR50.55(e),
reportable deficiency.
Grease in Friction Type Structural Connections.
ITEM:
Bolted structural steel connections in the Unit No.1 Turbine and Containment Building have evidence of grease between mating surfaces.
SUPPLIED BY:
Not a supplier-related deficiency. Structural connections were field assembled.
NATURE OF DEFICIENCY:
The Turbine Building is seismically designed per Regulatory Guide 1.29, and the Containment Building is a Seismic Class I structure.
These structural connections were designed as friction type connections, requiring grease-free mating surfaces.
These connections were previously inspected and accepted.
DATE PROBLEM OCCURRED:
August 30, 1982.
DATE PROBLEM REPORTED:
On September 15,1982, CP&L (N. 3. Chiangi) notified the NRC (Mr. C. Hehl) that this item was potentially reportable.
On April 26,1983, CP&L (N. 3. Chiangi) notified the NRC (Mr.
A. Hardin) that the item was reportable per the provisions of 10CFR50.55(e).
SCOPE OF PROBLEM:
A reinspection of the Turbine and Containment Buildings, including connections where engineering evaluation indicated grease in the connection coulu have safety significance, has been completed.
Approximately 878 connections were reinspected in the Turbine Building and 500 in the Containment, with evidence of grease being found in approximately 366 and 67, respectively. Additional connections in the Turbine Building were identified as having evidence of grease since the reinspection addressed by this reportable item was completed.
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SAFETY IMPLICATION:
These structural connections were designed as friction type connections, with the ability of the connection to resist a shear failure dependent on the friction coefficient of the mating surfaces. The grease on these surfaces, by reducing the slip resistance, could allow the shear load to be transferred to the bolts, for which they were not designed.
REASON DEFICIENCY 15 REPORTABLE:
Reportable due to the magnitude of the problem plus the extensive evaluation and/or rework required.
CORRECTIVE ACTION:
Appropriate site work and technical procedures have been revised to specifically require mating surface inspection during fit-up, and to specifically forbid the use of lubricants to fit up bolts. Inspection and craf t personnel have received additional training in inspection and erection of structural steel in formal classes and on-the-job training.
Permanent Walvers (PW's) were written, requiring engineering evaluation, for each deficient connection. Each connection has been accepted "as-is" If not significantly deficient, or has been repaired to make it acceptable, based on this engineering evaluation. In addition to the deficiency documented in this report, structural connections in the Turbine and Containment Buildings also exhibited gaps between mating surfaces and in the Turbine Building torch cut bolt holes. These conditions were reported as NRC Reportable items 92 and 112, respectively. Connections in the Containment Building have been accepted or repaired based on engineering evaluations. In the course of the reinspections, the welded pa: ts of the connections were inspected as well, and any deficiencies documented.
Ebasco Services has completed a reanalysis of the Turbine building structure taking into consideration the identified defects in combination. Actions required to close this item have now been completed.
FINAL REPORT:
We are currently in the documentation review / verification process which is required prior to close out of our site nonconformance report. it is projected ths.t the final report will be issued by May 10,1985.
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