05000272/LER-1979-056-01, /01T-0:on 790831,tests on RHR Sys Indicated Pump Flow Exceeded Design Runout Flow.Design Change Will Increase RHR Flow Resistance by Resizing Orifices in Flow Elements Upstream & Downstream of Heat Exchanger

/01T-0:on 790831,tests on RHR Sys Indicated Pump Flow Exceeded Design Runout Flow.Design Change Will Increase RHR Flow Resistance by Resizing Orifices in Flow Elements Upstream & Downstream of Heat Exchanger

ML19208B010
Person / Time
Site:	Salem
Issue date:	09/14/1979
From:	Kapple A Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19208B008	List: 05000272/LER-1979-056, Forwards LER 79-056/01T-0 05000272/LER-1979-056-01, /01T-0:on 790831,tests on RHR Sys Indicated Pump Flow Exceeded Design Runout Flow.Design Change Will Increase RHR Flow Resistance by Resizing Orifices in Flow Elements Upstream & Downstream of Heat Exchanger
References
LER-79-056-01T, LER-79-56-1T, NUDOCS 7909180417
Download: ML19208B010 (2)

LER-1979-056, /01T-0:on 790831,tests on RHR Sys Indicated Pump Flow Exceeded Design Runout Flow.Design Change Will Increase RHR Flow Resistance by Resizing Orifices in Flow Elements Upstream & Downstream of Heat Exchanger

Event date:
Report date:
2721979056R01 - NRC Website

text

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Report Number:

79-56/0lT Report Date:

9/14/79 Occurrence Date:

8/31/79 Facility:

Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

RHR Pump Exceeds Design Runout Flow CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 5 DESCRIPTION OF OCCURRENCE:

In response to a NRC question on Salem Unit 2 regarding RHR Pump NPSH during post-LOCA recirculation mode, a Unit 2 RHR Pump was tested for This the highest runout flow for the worst hydraulic configuration.

two configuration is when one RHR Pump is feeding two charging pumps, safety injections pumps and also directly into two cold legs.

Test results indicated that the RHR Pump flow exceeded the design runout flow.

Since the RHR Pump is required to operate under LOCA conditions, the RHR piping configuration existing on Salem Unit 1, which is iden-tical to Unit 2, is unacceptable.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

As indicated by the Unit 2 test results, it would appear that the Unit 1 RHR System flow resistance is low and the pump would runcut under the accident mode of operation.

AMALYSIS OF OCCURRENCE:

The Engineering Department evaluation of this condition will be sub-mitted in a supplemental report.

CORRECTIVE ACTION

A Design Change is in preparation by the Engineering Department which would increase the system flow resistance by resizing the orifices on the flow elements upstream and downstream of the RHR heat exchangers.

The Design Change has been accepted by Westinghouse.

The estimated time to make this change is approximately three weexs and should be completed during the present outage.

FAILURE DATA:

Not Applicable g gg],jg Prepared by A.W.

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