ML19323D011

to Inservice Insp Program for Pumps.

ML19323D011
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	05/13/1980
From:	VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML19323C993	List: ML19323C992 ML19323D011
References
PROC-800513, NUDOCS 8005190526
Download: ML19323D011 (3)

Text

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O 8006190526 1

Revision 3 Changes l l

Section Pages l

Pumps Insert Page P-10a

INSERVICE INSPECTION PROGRAM Record of Changes i

INITIALS INITIALS Change Date Change Date Number Entered PORC P1 Supt  !!00 Number Entered PORC P1 Supt M00 1 6/25/7d chrhy A" Whn 2 LO/18/79

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3 sfu/d , g l

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. Relief Request Basis Number: GP-1 Code Paragraph: Table IWP-3100-2 Basis For Relief:

A thorough review of past operating surveillance data and continuing

~ difficulty in obtaining consistent data indicates a need to re-evaluate the ranges specified in the code paragraph listed above. There are many causes for the difference in readings which have no relation to pump degradation.

Differences in the manner by which gauges or meters are read, accuracies associated with each instrument, the affect on the instrument system due to the inaccuracies of each component all contribute to readings that are out of specification by more than the 2% allowed by the code.

The nature of the test method required by ASME XI also contributes to the inconsistent data. When establishing the fixed parameter, there can be no tolerance since errors here will compound the error in reading the variable parameter. Because of the instrument inaccuracies and the test method, the data often unjustifiably falls into the required action level of ASME XI.

These test method induced discrepancies are not symptomatic of a pump failure.

Based on our experience in surveillance testing since commercial operation in 1972, the ranges proposed in the following section represent reasonable and expected deviations of the pump parameters. The proposed changes only expand the range in the more conservative direction, i.e.,

allowing more flow or a higher differential pressure. These ranges are consistent with our Safety Analysis in that they do not lower the minimum flow or discharge pressure required.

Alternative:

The high end of the various ranges will be adjusted upward as indicated in the following table:

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Parameter Acceptable Alert Action Q .94 - 1.08 .90 - <.94 <c.90

> 1.08 - 1.12  :* 1.12

/1P .93 - 1.08 .90 - c.93 <c.90

> 1.08 - 1.12 =>1.12 P-10a Rev. 3