ML20045E119

Revised Proposed Rev 1D to Bvps,Unit 1 IST Program for Pump & Valves

ML20045E119
Person / Time
Site:	Beaver Valley
Issue date:	01/29/1993
From:	Ostrowski K DUQUESNE LIGHT CO.
To:
Shared Package
ML20045E118	List: ML20045E117 ML20045E119 ML20045E120
References
PROC-930129, NUDOCS 9307010132
Download: ML20045E119 (22)

Text

__

DLC Response to NRC Letter Dated December 30, 1992 (TAC No. M84412)

ENCLOSURE 3 e

Beaver Valley Unit No.

1 IST Program Proposed Revision 1D-Revised (Including the Following. -Operating Manual Figures: 15-1, 15-2, 15-3, 15-4 and 15-5).

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INSERVICE TESTING (IST) PROGRAM FOR PUMP AND VALVES-Proposed Revision d k A 8 V/8 d.

- Pagesissued TOSC Review Date.

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Unit Operations Manager Review /Date Y

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This." Proposed-Revision".was made against Revision of the-present Unit

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RELIEF REQUEST 11 PLmp Mark No(s).:

1CC-P-1A 1CC-P-1B 1CC-P-1C Code Test Requirenent:

We resistance of the system shall be varied until-either the. measured differential pressure or the.

measured flow. rate equals the corresponding' reference value.

h e other test quantities shown~

in Table IWP-3100-1 shall then be measured ~ or observed and recorded.-

Basis for Relief:

he anount of Reactor Plant Component Coolirq Water System flow is dependent on the plant's seasonal heat load requirements 'and on River' Water System and seasonal Ohio River water temperatures. Se-overall amount of flow may vary by several hundred gallons per minute between cold winter months and hot summer months.

Varying Component Cooling header flows by adding or removing heat loads from service in order to.

increase or-decrease flowrate to a' specific reference value is not practical.

An' exact flowrate: cannot be duplicated because flow to same heat exchangers cannot be throttled and'those that can be throttled are not always capable'of being.

throttled due to system heat lo'ad requirements.

Se test-is typically performed by either isolating:

or. placing._ into service non-essential heat-exchangers which results in -.a gress flow change.

For this reason, a wider range-of' flow values, as.

on a punp curve, is needed as a' reference.

In addition, to throttle flow.to a reference value during hot summer -months when. flow demand _'is:

greatest requires. the. use - of - 'ai nanual butterfly _

valve 'at_ the discharge of:the pumps. : A butterfly valve is not designed to" be used as a throttle valve so throttling may result in~ excessive wear and premature failure of the valve. No other-

.i BVPS-1 IST (Proposed Revision 1D-REVISED)

RELIEF REQUEST 11 Basis for Relief:

valves are available to throttle header flw.

Also, operating experience has shwn that-' any throttlirg of the pump discharge butterfly valves results in a large reduction in cooling water flow to the Reactor Coolant Pump thermal barrier heat exchangers,- bearing lube oil. coolers and motor stator air coolers. P W M header flows result in low flow alarrs and heatup of the Reactor Coolant Pumps to near required manual pump trip setpoints which could ultimately-result in a-plant trip.

Finally, the added thermal cycling of~these~ coolers for pump testing could cause premature degradation of these heat exchargers.

IWP-3112 provides for multiple sets of reference values.

A pump curve is merely 'a graphical representation of the fixed response of.the pump to an infinite number of flow conditions which are based on some finite number of reference values verified by measurement.

Relief is, therefore, requested to use a pump curve,.which should provide an equivalent level of quality and safety in trending pump performance and degradation.- Flow will be permitted to vary as system conditions require.

Delta-P will be calculated and converted to a developed head for which ASME ranges will be applied.

Alternate Test:

A pump curve (developed per the, guidelines in Section I,

" Pump Testirg Requirements")

will be used 'to compare flowrate with developed pump head-at the flow conditions dictated by plant seasonal

. heat load' requirements per Reactor Plant Component CoolirrJ. Water Pump Tests,10SI-15.1,10ST-15.2 arxi-10ST-15.3 each quarter. Since normal flow varies, the most limiting vibration acceptance criteria will be used over thisJrange of flows based on baseline vibration data obtained at various flow points on the pump curve.

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ENCLOSURE 4 o

Beaver Valley Power Station Unit No. 1 Inservice Testing Program for Pumps and Valves, Issue 2, Revision 9.

e Attachment 1

Summary of Changes to the Unit No. 1'IST Program (Rev. 9).

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