ML18005A517
| ML18005A517 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 07/08/1988 |
| From: | Mcduffie M CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-88-004, IEB-88-4, NLS-88-161, NUDOCS 8807140248 | |
| Download: ML18005A517 (3) | |
Text
AcCEIZRATZD DISTMBUTION 'EMONSTRATION SYSTEM 0
0
SUBJECT:
Responds to NRC Pump Loss."
DISTRIBUTION CODE:
IE11D TITLE: Bulletin Response Bulletin 88-004, "Potential Safety Related COPIES RECEIVED:LTR '
ENCL
'SIZE:
(50 DKT)
NOTES:Application for permit renewal filed.
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR: 8807140248 DOC. DATE: 88/07/08 NOTARIZED: YES FACIL:50-400 Shearon Harris Nuclear Power Plant, Unit 1, Carolina AUTH.NAME AUTHOR AFFILIATION MCDUFFIE,M.A.
Carolina Power
& Light Co.
RECIP.NAME
'ECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
DOCKET 05000400 8
05000400 RECIPIENT ID CODE/NAME PD2-1 LA BUCKLEY,B INTERNAL: AEOD/DOA AEOD/DSP/TPAB NRR/DEST/ADE 8H NRR/DEST/MEB 9H NRR/DOEA/>CB 1 1
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B12 REG FILE 02 G
2 FILE 01 EXTERNAL: LPDR NSIC COPIES LTTR ENCL 1
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1 RECIPIENT ID CODE/NAME PD2-1 PD AEOD/DSP NRR RIVENBARK,G NRR/DEST/ADS 7E NRR/DOEA/EAB 11 NRR/DREP/EPB 10 NUDOCS-ABSTRACT RES/DE/EIB NRC PDR COPIES LTTR ENCL 1
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TOTAL NUMBER OF COPIES REQUIRED:
LTTR 21 ENCL cRO III,)
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Carolina Power 8 Light'Company P. O. Box 1551 ~ Raleigh, N. C. 27602 M. A. McDUFFIE Senior Vice Preaident Nuclear Generation Jg.
8 l988 SERIAL: NLS-88-161 United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT DOCKET NO. 50-000/LICENSE NO. NPF-63 RESPONSE TO NRC BULLETINNO. 88-00 Gentlemen:
Carolina Power dc Light Company (CPRL) hereby submits the information for Shearon Harris Nuclear Power Plant (SHNPP) requested by NRC Bulletin No. 88-00, Potential
'afety-Related Pump Loss.
This bulletin identifies two miniflow design concerns:
Pump-to-pump interaction with the potential to dead-head a.pump during miniflow operation and adequate miniflow capacity during single-pump operation.
Pum -to-Pum Interaction Durin Miniflow 0 eration The Boric Acid Transfer. Pumps have a miniflow arrangement in which the common portion of the line begins upstream of a single orifice, The miniflow line capacity was verified to be between 8 and 12 GPM during Preoperational Testing.
The minimum recommended flow for continuous operation is 5 GPM per current vendor recommendations.
In addition, a bypass line is provided around this orifice which can pass a flow of approximately 125 GPM. This bypass line can easily support both pumps without potential for dead-heading of either pump.
However, if the pumps were operated in parallel with the only aligned flow path being the miniflow line then one of the pumps may be dead-headed.
The operating procedure for the Boric Acid Transfer Pumps prevents simultaneous operation of both pumps without the bypass open.
Thus, the potential for dead-heading is prevented by administrative requirements for system operation.
Review of Installed Miniflow Line Ca acit The capacity of each miniflow line was verified to meet the minimum flow.
requirements currently specified in the Technical Manual for each of these services.
This verification utilized various sources and they included preoperational test data, design calculations, and surveillance testing, as applicable.
8807140248 880708 PDR ADOCK 05000400 9
Document Control Desk NLS-88-161 /.Page 2 A request was made to each of the pump vendors to review the current recommendations for acceptability.
As of this date, not all of the vendors have responded to the request.
The information supplied to date has been reviewed for otential problems.
The only problem identified to date is that the Emergency ervice Water (ESW) Booster Pumps have a miniflow capacity of approximately 1300 GPM which is less than the recently received vendor recommendation of 1800 GPM.
The impact of the discrepancy on ESW system'operation was reviewed. It was determined that only one credible situation exits in which an ESW Booster Pump would be operated on miniflow only. This would occur following an accident if the ESW return valve to the AuxiliaryReservoir failed to open.
In this,situation, there would be no ESW flow to any systems inside the power block. From an accident analysis prespective, this single failure would affect only'one ESW train and the other train would be fullycapable of mitigating the accident consequences.
From a pump reliability perspective, the existing miniflow line would provide a flow of approximately 1300 GPM and no immediate failure concerns are apparent due to not having a flow of 1800 GPM. The reduced flow should affect only the long-term reliability of the pump ifit were operated continuously at that flow.
Follow-U Actions The following follow-up actions are planned in response to this bulletin:
1.
The vendor recommendations not yet received willbe reviewed upon receipt to
..determine ifthe installed miniflow lines have sufficient capacity.
2.'
The Bgric Acid Transfer Pump operating procedures willbe reviewed and additional administrative restrictions will.be implemented, as appropriate, to further insure that both Boric Acid Pumps are not operated simultaneously with only the miniflow line in service.
3.
The ESW Booster Pump miniflow-line capacity willbe further reviewed to determine its adequacy.
This evaluation willinclude engineering analysis and testing as necessary to verify adequacy or to determine what modifications are necessary to correct the problem.
A written report willbe provided, as requested in the bulletin, within 30 days after completion of the above actions.
Each of the above items is scheduled for completion during the 1988 Refueling Outage.
Should you have any questions regarding this matter, please contact Mr. L. I. Loflinat (919) 896-6202.
Yours very truly, MAM/DBB/mss (5030 JSK) cc:
Mr. B. C. Buckley Dr. 3. Nelson Grace Mr. G. F. Maxwell M. A. McDuffie M. A. McDuffie, having been first duly sworn, did depose and say that the information contained herein is true and correct to the best of his information, knowledge and belief; and the sources of his information are officers, employees, contractors, and agents qf, Carolina Power R Light Company.
iriy commission expires: I//P7/~
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