05000312/LER-1982-003, Forwards LER 82-003/01T-0.Detailed Event Analysis Submitted

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Forwards LER 82-003/01T-0.Detailed Event Analysis Submitted
ML20042A848
Person / Time
Site: Rancho Seco
Issue date: 03/12/1982
From: Mattimoe J
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20042A849 List:
References
NUDOCS 8203240202
Download: ML20042A848 (2)
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LER-1982-003, Forwards LER 82-003/01T-0.Detailed Event Analysis Submitted
Event date:
Report date:
3121982003R00 - NRC Website
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$ SMUiG 9Ma SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 s Street, Box 15830, sacramento, cahfornia 95813; (916) 452 3211 i32Kl2i7 /1lb03 March 12, 1982 Rih;0F, j,.

R H EMGELKEN, REGIONAL ADMINISTRATOR AGN f,/NV m

'N REGION V 0FFICE OF INSPECTION AND ENFORCEMENT R

'/N U S NUCLEAR REGULATORY COMMISSION 1450 MARIA LANE SUITE 210 W

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M WALNUT CREEK CA 94596 l 0 D32x ?,

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LICENSE NO. DPR-54

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REPORTABLE OCCURRENCE NO. 82-03 N/ I.1 ; } t,,/

%s In accordance with Rancho Seco Nuclear Generating Station Technical Specifications Sections 3.3.2, and 6.9.4.lf and Pegulatory Guide 1.16 Section C.2.a(6), the Sacramento Municipal Utility District hereby submits a 14-day followup to the 24-hour notification of Licensee Event Report 82-03 sent to your offices on March 2,1982.

On February 26, 1982 at 0900 the "B" High Pressure Injection Pump (HPI) was taken out of service for maintenance to change the oil to correct a low oil pressure problem. When the pump was taken out of service, the supply breaker, an ITE 4160V breaker, was racked out and, at that time the power supply for the DC charging motor for the breaker closing spring was de-energized.

The function of this motor is to maintain the closing spring in charged condition. At 1715 on February 26, the pump was returned to service. The power for the DC charging motor was not re-energized.

At approximately 1945 on February 26, the surveillance for the "B" H'I pump was run to verify its operability. Since the closing spring is a stored energy device, it had sufficient energy to close the breaker once at the start of the test, and to open it at the close of the test.

At that time it had expended its energy and, since the DC charging motor was switched off, it was no longer capable of operating the breaker. Therefore, the HPI pump B became inoperable at that time.

This condition was not identified until March 1 at 1317 when an attempt to start the "B" HPI pump was made.

Investigation revealed the con-dition of the supply breaker. Th'e DC charging motor was re-energized and the "B" HPI pump was started to verify its operability.

It took approximately eight ninutes from the time the initial attemot to start the pump failed until the pump was actually started to verify operability.

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8203240202 820312 PDR ADOCK 05000312 S

PDR AN l t, f C T 4 I C ;YSTFV. f P.' l N C MORf THAN G i 0. 0 0 0 IN THi H E A it i Of CAltf0RNiA

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R. H. Engelken March 12, 1982

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It should be noted that this time sequence differs slightly from the preliminary report as stated in the 24-hour letter sent to your office.

The chronology as presented herein is the correct secuence of events.

In review of this matter, it is clear that the steps involved in the breaker racking procedures needed to be clarified and additional training needed to be provided to the' operators on the significance

.of those steps.

This training has been completed.

Since the "A" HPI pump was in service and operable, there were no i

consequences to public or plant safety nor did any transients result i

from s event.

D (h

I John J. Matti Assistant General Manager and Chief Engineer cc:

I&E Washington (30)

MIPC (3)

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