ML20056B714
| ML20056B714 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 01/25/1972 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 9102080413 | |
| Download: ML20056B714 (1) | |
Text
MSP
~
~
Flie Cy.
R e~t te -*
NORTHERN STATES POWER COMPANY w N N E APOU S. MIN N h SOTA 35401 f
p 9A '$
QS.;>
jl g$,
5 January 25, 1972 l
^ L9' NAf 'll
- v. &.3
/
Dr. Peter A lbrris, Director g
4 Division of Reactor Licensing j
United States Atomic Energy Commission N
Washington, D C 20543
Dear Dr. lbrris:
MONTICELLO NUCLEAR GENEFlATING PIANf Docket No. 50-263 License No. DPR-22 l
Reporting of Failure of Diesel % erator to Start A condition occurred at the }bnticello Nuclear aenerating Plant recently which we are reporting ic your office in accordance with provisions of Section 6.6.B.2 of Appendix A, Technical Specifications, of the Provi-sional Operating License DPR-22.
The Region III Compliance office has been notified of the occurrence.
On January 15, 1972, when the reactor was in a cold shutdown condition, Ii the No.12 Diesel Generator failed to start during a periodic surveil-lance test.
The dhsel control system is designed such that it idles for 11 minutes after receiving a stop signal.
The stop solenoid then holds the fuel injection cam closed for 3 minutes while the diesel coasts i
down. Accumulators are provided to move the cam to the open position after the 3-minute interval in preparation for the next start.
In the investigation following the failure to start, it was found that the stop l
solenoid held the fuel injection can closed (against the force of the accumulators) during the atte=pt to start the diesel.
The stop solenoid was adjusted so that it would perform its function to stop the diesel j
and yet allow the accumulators to open the fuel injection cam.
The die-cel was started a number of times after this adjustment; it performed satisfactorily each time. An administrative contzol has been added re-quiring that each time a diesel generator is operated, an operator vill verify that the fuel injection cam has returned to the proper position.
A Significant Operating Event report will be available on site for the Compliance Inspector.
Yours very traly, 9
p q
/
h.
DOCKETED 0-USALC L 0 Mayer,P.E.
2 L'
l' Director-Nuc1c - Support Services L-JAN 2 51972 " d RtcutrcRY - h i
LOM/br URL SIUTCN Ag
((Q OJ DOCKP CLERK s
N 9102000413 720125 4
9 CF ADOCK 05000263 66 S
CF_t..
_