ML20127L951
| ML20127L951 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 04/30/1985 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (55(E)-84-50), (NMP2L-0398), (NMP2L-398), NUDOCS 8505230134 | |
| Download: ML20127L951 (2) | |
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N3lMfdBA NIAGARA MOHAWK POWER CORPORAT10N/300 ERIE BOULEVARD WEST, SYRACUSE, N.Y.13202/ TELEPHONE (315) 4741511 April 30, 1985 (NMP2L 0398)
Mr. R..W. Starostecki, Director U. S. Nuclear ~ Regulatory Commission Region I Division of Reactor Projects 631 Park Avenue King of Prussia, PA 19406 Re:
Nine Mile Point Unit 2 Docket No. 50-410
Dear Mr. Starostecki:
Enclosed is a final. report, in accordance with 10CFR50.55(e), for the problem concerning nonconformances in tube fittings which were installed by Johnson Controls, Incorporated. This problem was reported via tel-con to T. Silko of your staff on November 9, 1984. An interim report was submitted via our letter dated December 10, 1984.
Very truly yours,
[
C. V. Mangav Vice: President Nuclear Engineering and Licensing CVM/GG/cla (0923H) xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gramm, NRC Senior Resident Inspector Project File (2) 8505230134 850430 DR ADOCK 050 0
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NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT - UNIT 2
- DOCKET NO. 50-410 Final Report for a Problem Concerning Nonconformances In Tube Fittings (55(e)-84-50)
Description of the Problem Unacceptable linear -indications on fittings supplied by Parker-Hannifin may have - been corrected by grinding, however, Johnson Controls Incorporated ~.did
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not - have _a ; program _ in effect to assure minimum wall requirements were: being met-after grinding.
Systems using these fittings may include the residual-
- heat removal system,l the low pressure core spray system, and the high pressure
. core: spray system.
Analysis of Safety Implications
! A : detailed analysis to determine the safety impact of grinding below' the
. minimum wall thickness requirement:was not performed.
However, if the wall thickness.was reduced -beyond acceptable limits, -it.could cause the loss of -
redundant safety-related -instrumentation - thus adversely affecting the safety
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of _ operations of the plant.
. Corrective Actions-1.
' Grinding in excess of 30 percent of the nominal section thickness will not be allowed; unless. specifically. directed by a Nonconfomance and Disposition Report.
-Where minimum wall violations are suspect, a
thickness verification inspection will-be performed per-procedure JC-QAS-1101.
2.
An attribute has been _added to the JCI Tubing Walkdown Checklist' requiring identification and corrective action.for fittings exhibiting potential minimum wall violations. -The acceptance criteria is stated in the Engineering and Design Coordination Report No. C03343.