ML20058L173
| ML20058L173 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 02/19/1974 |
| From: | Larson C NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 9105090398 | |
| Download: ML20058L173 (1) | |
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[}Q[Q Fr o sv y et a: M M-SYAYgs PowrEDE C 0 M P A MY 7jffbu Mmttcem, wrnna-ota 55362
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Feb msty 19, 1974 i
I W. J. G, Kcppler, Reglenal Director Directorate of Regulatcry Operations Region III United States Atomic Ennrgy. Oooraission 799 Reouvvelt Road Glen..Bilyn, Illinois 61073 Daar Mr. Kcpplcr:
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M0t7tICBLIO WCLEAR GE!EFATING PIA'E
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Docket No. 50-265 License No. DPR-22 l
On Fetmrarr 16, 1974, while perfomint a routine. curveillanca tost, ti:e aa*h ercL 131V's AD-2-868 sad AD-2-BCC, failed to clor,e usire the control i
mom handsuitch,. Tha redurdant MSIV's on. the "S" ara 't" ste:m linas t:cre closal and the reactor was brought to a hot standfrf condition thile-an inirestigation was cc ducted.
It was fourvi that the fai3ttres wen-due to ir@mper operation of the AC solenoids on the EtSIV air operators. Purther investigation revealed a desiga i
deficiency in tha AC solcocid pitmger.
In cddition, natal shwings were fotaxi in the solexcid manifold.
The mtal shavirgs were a resttic of in+pno j
manufacturing techniques.
The solenoids and manifolds for all ruin st.eam isolation valves were disaccambled and cicaned. New pli.cners of an liieuwei design vero installed in all AC solenoids.
All Mi1V's were denoustrated to function properly prior to retuming to powr operatien '
Yours very pyy, I
C
' Plant Manager j
CEI/nuun cc:. J P 0%ty. Directorate of Licensing G Charnoff Minnesota Pollution Control Agency
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l Attn:
E A Pryzina Pile Copics sent by teleconfor to Kappler arul OUseary 9105090398 740219 CF ADDCK 05000263
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