05000281/LER-1992-001, Corrected Page 3 to LER 92-001-00 Re 920130 Mechanical Failure Due to Oil Leak from Charging Pump a Bearing & Damper Remaining Closed on Charging Pump B

Corrected Page 3 to LER 92-001-00 Re 920130 Mechanical Failure Due to Oil Leak from Charging Pump a Bearing & Damper Remaining Closed on Charging Pump B

ML20094M733
Person / Time
Site:	Surry
Issue date:	03/26/1992
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18153C951	List: 05000281/LER-1992-001, Corrected Page 3 to LER 92-001-00 Re 920130 Mechanical Failure Due to Oil Leak from Charging Pump a Bearing & Damper Remaining Closed on Charging Pump B
References
LER-92-001-04, LER-92-1-4, NUDOCS 9204010320
Download: ML20094M733 (1)

LER-1992-001, Corrected Page 3 to LER 92-001-00 Re 920130 Mechanical Failure Due to Oil Leak from Charging Pump a Bearing & Damper Remaining Closed on Charging Pump B

Event date:
Report date:
2811992001R00 - NRC Website

text

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- 0l0 0l3 or 0l4 rw w - em. e o.e,-.< a, ea me nn. ww.nn, 2.0 SIGNIFICANT SAFETY CONSEOUENCES AND IMPLICATIONS The charging pumps provide makeup and seal water injection flow to the Reactor Coolant :'ystem during normal operation and also serve a:

high head safety it.)c W pumps in a design bar.5 accident.

Three charging pumps are pm n&d.

Each pump can provhie 100% of normal j

charging or design high ht ad safety injection flow.

The pumps were not fully operable in accordance with the definition in Technical y

Specification 1.0.D.

Ilowever, either the "A" or "B" chr 4 ng pump was 3

capable of performing its high head safety injec' ion function during a design basis accident until the "C" charging pump could be placed in service.

Engineering calculations performed previously for Station Blackout indicate that a charging pump could nn while its associated damper was cined for up to four hours.

Thrrefore, the accident design basis assumptions would have been satisfied and no actual or potential consequences to public health and safety were created by the event.

?

2 3.0 CAUSE OF TIIE EVENT The January 30, 1992 evem was caused by mechanical failure due to an oil leak from the "A"

.;harging pump bearing and th.

damper remaining closed on the "B"

charging pump.

The failure cf the dsmper resulted from human error due to a procedural deficiency and weakness in training on the manual operation of the damper.

On January 28, 1992 testing had been performed on the Emergency Ventiation System.

This testing required the charging pump ventilation damper (2-VS-MOD-201B) for the "B" charging pump to be de cnergized and the handwheel manually depressed.

The charging pump ventilation dampers are equipped with a manual cut off switch which is actuated when the handwheel is depressed for manual operation.

The cut-off switch prevents injury due to unexpected restoration of power and is automatically reset when the handwheel is returned to the raised position.

It was concluded that the handwheel was left in the manual position upon completion of the testing.

The manual operation of the damper is infrequently performed and not covered by a procedure, in addition, the operator training program does not provide training on this feature.

4.0 IMMEDI ATE CORRECI1YLACTION(S)

Troubicshooting by on shift Operations and Maintenance personnel determined that the handwheel on the operator for damper 2 VS-MOD-20 lf!

was aepressed for manual operation which prevented the 9204010320 920326 PDR ADOCK 05000281 S

PDR NMC Penn 344A (6491 x-