05000280/LER-1979-033-03, /03L-0:on 791127,during Normal Operation,Personnel Observed Reduction in Flow & Pressure in Charging Pump Svc Water Subsys.Caused by Broken Stem on 1-SW-107,w/valve Disc Partially Blocking Pump Supply.Valve Replaced

/03L-0:on 791127,during Normal Operation,Personnel Observed Reduction in Flow & Pressure in Charging Pump Svc Water Subsys.Caused by Broken Stem on 1-SW-107,w/valve Disc Partially Blocking Pump Supply.Valve Replaced

ML18136A320
Person / Time
Site:	Surry
Issue date:	12/21/1979
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18136A319	List: 05000280/LER-1979-033-03, /03L-0:on 791127,during Normal Operation,Personnel Observed Reduction in Flow & Pressure in Charging Pump Svc Water Subsys.Caused by Broken Stem on 1-SW-107,w/valve Disc Partially Blocking Pump Supply.Valve Replaced ML18136A318
References
LER-79-033-03L-01, LER-79-33-3L-1, NUDOCS 7912270560
Download: ML18136A320 (2)

LER-1979-033, /03L-0:on 791127,during Normal Operation,Personnel Observed Reduction in Flow & Pressure in Charging Pump Svc Water Subsys.Caused by Broken Stem on 1-SW-107,w/valve Disc Partially Blocking Pump Supply.Valve Replaced

Event date:
Report date:
2801979033R03 - NRC Website

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NRC FORM 366 (7-77)

U. Se::LEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK: LI _

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LICENSEE CODE 1 IG)l o I o I - I o I o I o I o I o I - I o I o 1014 I 1 l 1 I 1 I 1 101 I I 0 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T [ITD 7

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~;~~~~ LJ©I O I 5 I O I o Io I 2 I s I 0101 11 11 21 11 71 9 IG)I 11 2 I 2 I 1 I z I 9 I G) 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

I While Surry Unit No. 1 was in steady state operation at 100% power, Control Room persad-

[))}]* I nel observed a reduction in flow and pressure in the charging. pump service water

((II] I subsystem.

This is contrary to T.S. 3.13B.2 and TS.S 3.14.A.5 and is reportable in

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I accordance with T.S. 6. 6. 2. b. 2.

The heal th and safety of the public were not affect-

[)))) I ed since the redundant train was operable.

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SYSTEM CODE 1w jB I@

9 10 LER/RO c-VENT YEAR REPORT j 7 J 9 j NUMBER 21 22

CAUSE

CAUSE CODE SUS CODE COMPONENT CODE I El@ !:!_j@ IVIAIL!VlEJxl@

11 12 13 SEQUENTIAL REPORT NO; 1-1 1013131 j/j 23 24 26 27 18 OCCURRENCE CODE 1° 13 J 28 29 COMP.

SUBCODE 11U@

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20 L=J 31 REVISION NO.

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SUPPLIER COMPONENT MANUFACTURER 33 34 35

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CAUSE DESCr'li?TION AND CORR::CTIVE ACTIONS @

42 43 44 IA broken stem on l-Sw-107 caused the valve disc to drop into the suction side flow [IJI] !path of 1-SW-P-lOA w~ich resulted in a partial blockage of the pump supply and a CIIIJ 1reduced outlet flow £nd pressure to the charging pump service water subsystem.

DJIJ l Corrective action was taken immediately to restore the flow path.

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FACILITY STATUS

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SURRY POWER STATION, UNIT NO. 1 DOCKET NO. 50-280 REPORT NO: 79-033/031-0 EVENT DATE: 11/27/79 TITLE OF REPORT:

Failure of Service Water Valve (l-SW-107)

1.

DESCRIPTION OF EVENT

W'..riile Surry Unit No. l was in steady state operation at 100% power, a reduction in charging pump service water subsystem flow and pressure was observed by Control Room personnel.

This event constitutes a condition contrary to T.S. 3.13.B.2 and T.S. 3.14.A.5, and is reportable in accordance with T.S. 6.6.2.b.(2).

2.

PROBABLE CONSEQUENCES/STATUS OF REDUNDANT SYSTEMS:

The charging pump service water subsystem provides cooling water to the charging pump mechanical seal coolers and charging pump lubricating oil coolers.

A complete description of the systems is contained in FSAR sections 9.4.1.4 and 9.4.3.5.

The degradation of the affected system did not have any direct safety implications.

Since the redundant train was operable, the health and safety of the public were not affected.

3.

CAUSE OF THE EVENT

The valve stem was broken due to deterioration.

4.

IM.'1EDIATE CORRECTIVE ACTION:

The dropped disc was removed to restore the flow pa th.

5.

SCHEDULED CORRECTIVE ACTION:

The degraded valve has been replaced.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

None re-quired.

7.

GENERIC IMPLICATIONS:

This has been identified as a generic problem.

A design change package has been generated to replace all affected valves with ball valves in the Charging Pump Service Water Subsystem.

The modification has been implemented on Unit 2 and Unit 1 will be completed during the SGRP outage.