ML20246D859

Forwards Supplemental Response to NRC Bulletin 88-004, Potential Safety-Related Pump Loss. Svc Water Pump Operating Instructions Revised Re Min Flow Requirement to Preclude Abnormal Operating Configuration or Sys Mod

ML20246D859
Person / Time
Site:	Calvert Cliffs
Issue date:	08/22/1989
From:	Lippold W BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-88-004, IEB-88-4, NUDOCS 8908280304
Download: ML20246D859 (4)

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.8 BALTIMORE i l GAS AND ELECTRIC  ;

CHARLES CENTER

• P.O. BOX 1475

• BALTIMORE, MARYLAND 21203-1475 (301) 234-5000 NUCLEAR ENGINEERING SERVICES DEPARTMENT CALVERT CLIFFS NUCLEAR POWER PLANT LUSBY, MARYLAND 20657 August 22, 1989 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION: Document Control Desk

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Supplemental Response to NRC Bulletin 88-04, " Potential Safety-Related Pumn Loss"

REFERENCES:

(a) Letter from Mr. J. A. Tiernan (BG&E) to NRC Document Control Desk, dated July 5, 1988, Response to NRC Bulletin 88-04, Potenti::1 Safety-Related Pump Loss (b) Letter from Mr. J. A. Tiernan (BG&E) to NRC Document Control Desk, dated December 21, 1988., Revised Schedule for Completing Action Items in . Response to NRC Bulletin 88-04, Potential Safety-Related Pump Loss Gentlemen:

As required by NRC Bulletin 88-04, " Potential Safety-Related Pump Loss," we presented you with the results of our evaluation of minimum flow configurations and capacities of major safety-related centrifugal pumps installed at Calvert Cliffs (Reference a). We also committed to completing all remaining outstanding items by December 31,1988. All of our action items, except for Service Water (SRW) pumps, were completed on schedule (See Attachment 1 ).

By letter dated December 21,1988, (Reference b), we informed you of the need to extend the completion date of our SRW pump evaluation to June 30, 1989. Our SRW pump supplier had requested we undcrtake a testing program to evaluate pump vibration levels at reduced flow rates after having initially agreed upon a minimum flow requirement. This action item was also completed on schedule (See Attachment 2). These actions complete our response to the subject bulletin, j i

8908280304 DR 890822 N ADOCK 05000317 , ,

PDC

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. , Document Control Desk '

&' - August'22h1989

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l Should ' you - have any further ' questions regarding this matter, we will .' be' pleased to discuss them Lwith you.

Very truly yours, J

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W. J. Lippold General Supervisor Technical Services Engineering -

WJL/GLB/gla cc: D. ~ A. Brune, ~ Esquire J. E. Silberg, Esquire 1 R.' A.Capra, NRC

. S. 'A. McNeil, NRC-

'W. T. Russell, NRC -

V. L. Pritchett, NRC

. T. Megette, DNR '

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ATTACHMENT (1)

SUPPLEMENTAL RESPONSE TO NRC BULLETIN 88-04, POTENTIAL SAFETY-R. ELATED PUMP LOSS The following action items were completed by December 31, 1988.

1. CONTAINMENTSPRAY.LCO PUMPS ACrlON ITEM The pump Preventive Maintenance (PM) instructions will be' modified to reflect the augmented inspection.-

ACTION TAK EE_

The CS Pump PM instructions have been revised to require an augmented inspection every five years.

2. STEAM-DRIVEN AUXILIARYFEEDWATER (Sp_AFW) PUMPS ACTION TTEM The pump PM instructions will be modified to refir,ct the augmented inspection.

ACTION TAK EH The SDAFW pump PM instructions have been revised to require an augmented inspection every five ye'ers.

3. SALTWATER (SW) PUMPS ACTION ITEM Vendor Recommendations will be finalized and implemented, as appropriate, and operating instructions (OI) will be modified, as necessary.

ACTION TAKEN The SW pump supplier confirmed the adequacy of our SW pump minimum flow requirements and did not require any change in normal maintenance schedules. The

, SW OI has been revised to specify a range of SW header pressures to ensure required pump minimum flow.

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ATTACHMENT (2)

• - SUPPLEMENTAL RESPONSE TO NRC BULLETIN 88-04, .

I- POTENTIAL SAFETY-RELATED PUMPLOSS The following . action item was completed by June 30, 1989.

SERVICE WATER (SRW) PUMPS l ACTION TrEM Undertake a testing program to evaluate pump vibration levels at reduced flow . rates.

Evaluate . the results and obtain concurrence from the pump supplier. Implement changes, as necessary, for maintaining minimum pump flow.

ACTION TAKEN The SRW pumps were tested at reduced flow rates. The vibration data collected was sent to our SRW pump supplier for analysis. They confirmed the adequacy of our SRW. pump minimum flow requirements and did not require any change in normal maintenance schedules. No change . to the. SRW pump operating instruction was required because the SRW pumps would not normally be operated below the required minimum pump flow.

(Note: Subsequently, we have decided to revise the SRW pump OI to document the minimum flow requirement to preclude the possibility of a future system modification or abnormal operating configuration allowing a lower flow).

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