05000280/LER-1981-054-03, /03L-0:on 810923,during Cold Shutdown,Higher than Normal Activity Detected in Storm Drain Sys.Attributed to Leaks from Stripper Feed Steam Heater Caused by Four Tubes Leaking in Heat Exchanger Bundle & Receiver Pumps Failure

/03L-0:on 810923,during Cold Shutdown,Higher than Normal Activity Detected in Storm Drain Sys.Attributed to Leaks from Stripper Feed Steam Heater Caused by Four Tubes Leaking in Heat Exchanger Bundle & Receiver Pumps Failure

ML20011A934
Person / Time
Site:	Surry
Issue date:	10/21/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20011A932	List: 05000280/LER-1981-054, Forwards LER 81-054/03L-0 05000280/LER-1981-054-03, /03L-0:on 810923,during Cold Shutdown,Higher than Normal Activity Detected in Storm Drain Sys.Attributed to Leaks from Stripper Feed Steam Heater Caused by Four Tubes Leaking in Heat Exchanger Bundle & Receiver Pumps Failure
References
LER-81-054-03L-03, LER-81-54-3L-3, NUDOCS 8111030377
Download: ML20011A934 (2)

LER-1981-054, /03L-0:on 810923,during Cold Shutdown,Higher than Normal Activity Detected in Storm Drain Sys.Attributed to Leaks from Stripper Feed Steam Heater Caused by Four Tubes Leaking in Heat Exchanger Bundle & Receiver Pumps Failure

Event date:
Report date:
2801981054R03 - NRC Website

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a12: I With the unit at cold shutdown. higher than normal activity was detected in the 1

5TT1I storm drain system. The increase in the storm drain activity was attributed to l

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D es t I contrary to T.S.3.11. A.4 and reportable per T.S.6.6.2.b(4). The activity of the l

p is l l storm drain water released was within T.S. limits (.667% of T.S.). Therefore, the f BT l I health and safety of the nublic were not affected.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i s o ! 1 The release was caused by the leaking of four tubes in the heat exchanger bundle of l

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o ATTACHMENT 1 SURRY POWER STATION, UNIT 1 DOCKET No:

50-280 REPORT NO:

81-054/03L-0 EVENT DATE:

09-23-81 TITLE OF THE EVENT:

UNCONTROLLED RELEASE 1.

DESCRIPTION OF EVENT

With the unit at cold shutdown, higher than normal activity was detected in the storm drain system. A plant inspection ensued and the increase in the-storm drain activity wa's attributed to leaks from stripper feed steam

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heater 1-BR-E-10A.

Leaks from heater 1-BR-E-10A had backed up from the auxiliary steam drain receiver, through the roof vent, and escaped into the storm drain. This uncontrolled release is contrary to T.S.3.11.A.4 and reportable per T.S.6.6.2.b(4).

2.

PROBABLE CONSEQUENCES:

The activity of the water that escaped via the storm drain was within Technical Specification limits (.667% of T.S.).

Therefore, thte health and safety of the public were.not affected.

3.

CAUSE

The unplanned release was due to the lecking of four tubes in the heat exchanger bundle of stripped feed steam heater 1-BR-E-10A and the failure of the auxiliary steam drain receiver pumps to prevent the receiver from overflowing to the roof vent. The failure of the drain receiver pumps to start was due to punp 1-AS-P-1B being tagged out for a locked rotor and level controller problems with the second pump (1-AS-P-1A).

4.

IMMEDIATE CORRECTIVE ACTION

The immediate corrective actica was to locate and isolate the source of inleakage to the storm drain.

5.

SUBSEQUENT CORRECTIVE ACTION:

The leaking tubes in heat exchanger 1-BR-E-10A were plugged and the heat exchanger was returned to service on 9/27/S1.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

The auxiliary steam drain receiver pumps were repaired to operate correctly.

An engineering study will be initiated to investigate the problem of contaninated leakage into the auxiliary steam drain receivers.

7.

GENERIC IMPLICATIONS; None.