ML17037B742
| ML17037B742 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/07/1978 |
| From: | Lempges T, Schneider R Niagara Mohawk Power Corp |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML17037B742 (6) | |
Text
NIAGARA MOHAWK POWER CORPORATION NINE MILE POINT NUCLEAR STATION UNIT ¹1 Narrative of 0 eratin Ex erience August 1978 The unit operated at 80;8~o capacity factor with an availability of 95.9~o for the month.
The month began with unit derated to 94~~ Core Thermal Power due to scram reactivity considerations; the unit was at 94~a power on August 1.
Control Rod withdrawals were used to maintain power/flow position of 94~~
CTP when at 0110 on August 3 a reactor scram occurred due to high flux because of a problem encountered while testing MSIV's.
The scram was attributed to either operator error or a hung-up relay in the test circuit.
Many tests were conducted but no malfunctions could be found.
A plant start-up was commenced at 1345 with reactor critical at 1650 and on the line at 0655 on August 4.
Continued startup and load increases reaching 450 MWe by 2230.
The following day after awaiting Xe build-up, reduced load to 375 MWe for setting final rod pattern.
Load was sub-sequently increased to 430 MWe by 1710, and load increases at the pre-conditioning rate of 3 MWe/hr were initiated.
On Monday August 7, station output was approximately 540 MWe with preconditioning ramp rate still in effect.
Completed an LPRM calibration on August 8, and reached preconditioned envelope to 1711 MWt on the 9th of August; also started power rod withdrawals to maintain 94~o CTP (553 MWe).
Reduced load to 500 MWe at 2230 on 11th of August in order to re-place seals on ¹11 motor driven feedwater pump.
Load recovered to 540 MWE at 2230 the following day upon completion of pump work, and output of 554 MWe attained at 0800 on the 13th of August.
Unit operated at approximately 94'o CTP by rod withdrawal until 2200 on the 19th when a reduction to 450 MWe via reactor recirculation flow occurred in order to withdraw shallow control rods.
Preconditioning from 461 MWe was initiated and station output of 537 MWe was reached at 0540 on August 21.
Unit operated at this power level until August 27 when a coast down to 92~o CTP was initiated, to meet new power/flow limitations based on scram reactivity considerations.
- However, a further reductions to approximately 80>~ power was required when ¹11 Reactor Recirculating Pump had to be taken out of service at 1735 due to a pump cooler leak.
The plant was derated to 84'o CTP from the 27th through the end of the month, and output was at approximately 485 MWe during this period.
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It V ÃIl&SABB g ppgG@gqnyg NWP-0185 NIAGARAMOHAWKPOWER CORPORATION/300 ERIE BOULEVARDWEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511 Auguek 7, 1978 NJLe~/L 0(gee o) hfanagemeet'nfo/Im~n and Paog/Iam Co~oL U~ed S~e5 NucLea/L ReguLatocg CommLwmn Olae&ngkon, V.C.
20555 RE:
'Dock& No. 50-220 8PR-63 Gentlemen:
Sub~ed he/L~h ~ Xhe RepoM o) Ope/c~ng
$~&cb and S~oI0n Expetu.ence
$o/L 3'uLI/ 1978
)o/L We N~e h4Le Pokery NucLea/L S~on U~ ill.
ALeo LneLudedks a Na/vIative RepoM o( Oping Expetu,ence (o/L She mort'h.
Ve/Ly ~I/ you/L6, xc:
Sme~/L, O(g.e,e os 78E (10 eop~e5)
NRC Regin 'i OlI/~e (1 copy)
Thomas E.
Lempge5 Gene/IaL Supetu'.etendeet-NueLea/L Gene/cation R.R.
SchneLde/L VLce Pae5&eet-ELe~e Prcodu~on
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