ML20090D559
| ML20090D559 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/01/1972 |
| From: | Schneider F NIAGARA MOHAWK POWER CORP. |
| To: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20090D553 | List: |
| References | |
| 4268, NUDOCS 8303020150 | |
| Download: ML20090D559 (2) | |
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o NIAGARA MOHAWK POWER CORPORATION MAGARA MOHAWM 300 Ente souLEVAmo WEST s = cusa.
- v. woe August 1, 1972 Mr. Donald J. Skovholt Assistant Director for Reactor Operations 3
Division of Reactor Licensing United States Atomic Energy Commission Washington, D. C.
20545
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Dear Mr. Skovholt:
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r Re: Provisional Operating License: DPR-17 Docket No.: 50-220
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Appendix A (Technical Specifications 3.3.1 a and 3.3.1 b) of Provisional.
Operating License DPR-17 for Nine Mile Point Nuclear Station, Unit #1 states:
3.3.1 a "After completion of the startup test program and demonstration of plant electrical output, the primary containment atmosphere shall be reduced to less than five percent oxygen with nitrogen gas whenever the reactor coolant pressure is greater than 110 psig and the reactor is in the power operating condition, except as specified in "b" below."
3.3.1 b "Within the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period subsequent to increase of the reactor coolant
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pressure above 110 psig whenever the reactor is in the power operating condition, the containment atmosphere oxygen concentration shall be
-7PJO reduced to less than five percent by weight and maintained in this con-dition. Deinerting was commenced 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to a major refueling
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outage or other scheduled shutdown."
An orderly shutdown of Unit #1, Nine Mile Point Nuclear Station was begun on July 27, 1972 due to increasing recirculation system valve packing leakage within the drywell.
Following repacking of the affected valves, the unit was restarted on July 30, 1972 and reached 110 psig at 0700 that day.
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Lf Mr. Donald J. Skovholt United States Atomic Energy Commission
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A prior to shutdown with.ut ion il Cylinder Gas, a L
An agreement had been made
.n Conshohocken, ra. for delis.ers of two t rusks of nitrogen on July 30, 1172.
Normal inertang require O hours and could
..A nitrogen gas supplier
- ccomplished that day, well within the :equired 24 1.>urs, liowever,.
j havtg dift.ulty in t
easily be stat ion per,onnel, the gas supplier was ni startup of q
s unknown ti trog<
obtaining frivers for the necessary two trucks et t hat
.h the Unit Nyond !!O ps ig continued, based upon the p ior ap eerent Y midnight, tuly 10, 1972 g
I nitrogen -auld be arri>tng for inerting that day.
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.nerting on site, it was deemed necessary by station continue ith the with no n:trogen for personnel to hold thermal power to 1200 W(t) and ne' was inerted.
normal scheduled star'.p unti1 the drywe t '
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t July 31, 19'2 station the norning f
truck of nitrogen arrived at theThe drywell atmosphere was redi.ced to less d
The first and inert ing began immedi at ely.
at 1400 than five percent oxygen at 1345 that das, reaching 3.9 percent The start up scheduled then continued.
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g inerting and j
II remained within specification following.
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The drywe.1 atmosphere in the evening, July 31, 1972 was 7
with the arrival of the second truck late j
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reduced to it s presen' level of one percent by weight of oxygen, 4
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\\ cry truly yours,
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Original signed by F. J. Schneider n.
I F. J. Schneider J
\\..e Presiden+ - Operations m
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