ML20052D531
| ML20052D531 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 04/21/1982 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Dise D NIAGARA MOHAWK POWER CORP. |
| References | |
| NUDOCS 8205060557 | |
| Download: ML20052D531 (3) | |
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Docket No. 50-220 ie
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Mr. Donald P. Dise Vice President - Engineering 1
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Niagara Mohawk Power Corporation cf
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Syracuse, New York 13202 4
Dear Mr. Dise:
Subject:
Furnace Sensitized Stainless Steel Safe-Ends at Boiling Water Reactors Re:
Nine Mile Point Nuclear Station, Unit No.1 On March 23, 1982, d hydrostatic test was perforned at 900 psig on the primary systen at the Nine flile Point Nuclear Station, Unit 1.
Leakage was Visually observed in two recirculation loop Safe-end welds.
The inspection identified three leaks in a recirculation puup discharge safe-end and one leak in a recirculation pump suction safe-end. P re-lininary investigation has identified three pinhole leaks and a single 1/2-inch leak, all of which are in the area of the heat affected zone of the safe-end to pipe weld.
On llarch 26, 1982, you conducted ultrasonic tests on the affected safe-ends.
It is our understanding that these tests confirred the initial visual observation.
We understand that ten new replacement safe-ends are onsite and that you estimate six runths to one year to accomplish core offload, reactor vessel dewatt ring and decontanination and the changeout of a miniora of two safe-ends. Furthermore, we understand that you intend to replace all ten safe-ends unless test results would indicate otherwise.
Pursuant to 10 CFR.50.54(f), we request that you provide the NRC, within 15 days of eu eipt of this letter, your plans and schedule for: (1) reactor decontanination, (2) nitigation of worker radiation doses, (3) renoval and replacement of safe ends, and (4) your justification for resuming operation.
This information should be submitted to the NRC, signed under oath and af firration, to enable the Comission to determine-whether or not the license should be nodified, suspendad, or revoked.
In this regard your submittal on the repair program including decontamination measures should be provided to this office for prior approval before significant and irreversible repair prograns are undertaken.
The principal reasons for this requirement are to ensure that inportant generic data is not lost because of the rethod of ennair-an f to be assured that the reoair orocess itself will not ieona rdize "55656565ST Bd642i" cunNAre )
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future operation of the facility. Please note that it is our present intention to require the replaceirnt of all ten affected safe-ends prior to the restart of the Nine Mile Point Nuclear Station, Unit No.1.
The reporting and/or recordkeeping requirements contained in this letter af fect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely,
{arre11 g, Eisenhut 1 2nal of ened b 8
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Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation cc:
See next page Distribution:
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Mr. Donald P. Dise
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cc:
Leonard M. Trosten, Esq.
LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N. W.
Suite 1100 Washington, D. C.
20036 State University College at Oswego Penfield Library - Documer t s Oswego, New York 13126 Resident Inspector c/o U.S. NRC P.O. Box 126
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Lycoming, New York 13093,
Carl D. Hobelman, Esq.
I LeBoeuf, Lamb Leiby & MacRae 1333 New Hampshire Avenue, N.W.
Suite 1100 Washington, D.C.
20036 Ronald C. Haynes j
Regional Administrator, Region I i
U.S. Nuclear Regulatory Commission 631 Park Avenue i
King of Prussia, PA 19406
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