ML20195F606
| ML20195F606 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/15/1988 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| C311-88-2138, IEB-82-02, IEB-82-2, NUDOCS 8811220075 | |
| Download: ML20195F606 (2) | |
Text
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e GPU Nuclear Corporation ENuclear
= = eo P,bdd!etown Pennsylvania 17057 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
Noverter 15, 1988 C111-88-2138 U.
S. Nuclear Regulatory Commission Attn:
Document control Desk Washington, DC 20555
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Clarification of GPUN Response to IE Bulletin 82-02 The purpose of this letter is clarify GPUN's commitment for inspection of reactor coolant pressure boundary (RCPB) fasteners that are reused following removal.
IE Bulletin 82-02, entitled "Degradation t: Threaded Fasteners l
in the Reactor Coolant Pressure Boundary of PWR Plants" concerned Stress-Corrosion Cracking (SCC) and boric acid wastage of threaded fasteners for closure connections.
The bulletin requested, among other things, that inspectionu be performed during the following refuelirg outage that began 60 days af ter the date of the bulletin.
Thicaded fasteners of closurc connections, identified in the scope of the bulletin, when opened for component inspection or maintenance were to be removed, cleaned, and inspected per Paragraphs IWA-2210 and i
IWA-2220 of the ASME Code Section XI (1974 edition or later) before being reused.
A report was required to be submitted 60 days following completion of the outage during which these l
inspections were performed.
The report was to identify the I
specific connections examined as required by the bulletin I
(Item 2) and provide the results of the examinations performed.
1 GPUN's responso dated December 5, 1985 (5211-85-2198) provided the reauested information.
Our responso did not however provide a clear statement of our commitment for future examinations of RCPB fasteners prior to reuse following inspections or maintenance.
GPUN intends to perform Visual Examinations (VT) on all RCPB
'asteners prior to reuse.
Magnetic Particle (MT) or Penetrant cxaminations (PT) will also be performed unless:
- 1) the RCPB fastener has only experienced short term service (s 3 months)
C811220075 691115 I
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Poe GPU Nuclear Co.rporat>cn is a subs;d ary et the Geref al Puthc Utat es Corre at en g [g i
r c311-88-2138 November 15, 1938 since its last MT or PT and 2) the fastener was found dry and without evidence of boric acid crystals or rust.
This exception could potentially save a significant amount of critical path time and some personnel exposure during unplanned I
outages that occur within three months of the beginning of a cycle.
Such an exception is justified in that 3 months of l
operation is a relatively insignificant period of service for fasteners which have recently passed the MT or PT examination and Sct or boric acid wastage is unlikely where the fastenor was found dry with no evider.cc of leakage or moisture.
t i
Sincercly,
)~(1Ci j'
F s
y H. D.
ukill Vice President and Director, TMI-1 HDH/MRK cci J. Stol:
R. Hernan R. Conto W. Rt' q soll