U-601223, Responds to NRC Bulletin 88-004, Potential Safety-Related Pump Loss

Responds to NRC Bulletin 88-004, Potential Safety-Related Pump Loss

ML20151D344
Person / Time
Site:	Clinton
Issue date:	07/12/1988
From:	Hall D ILLINOIS POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
DPH-0645-88, DPH-645-88, IEB-88-004, IEB-88-4, U-601223, NUDOCS 8807250071
Download: ML20151D344 (12)

Text

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U- 601223 L30-88 ( 07 -; 12)-LP-y ,

1A.120-ILLINO/8 POWER 00MPANY CLINTON POWER STATION. P.O. 80X 678. CLINTON, ILLtNOl$ 61727 DPH-0645 July 12, 1988 -'

Docket No. 50-461 U.S. Nuclear ~Repulatory Commission Document Controi Desk '

Washington, D.C. 2.0555

Subject:

Clinton Power Station Response to NRC Bulletin No. 88-04

Dear Sir:

This letter is in response to NRC Bulletin Number 88-04, "Potential Safety Related Pump Loss." The Attachment provides Illinois Power Company's response.

I hereby affirm that the information in this letter is correct to the best of my knowler:ge.

Sincerely yours, D. . Hall '

Vice President DPH/krm Attachment cc: Regional Administrator, Region III, USNRC NRC Clinton Licensing Project Manager -

NRC Resident Office Illinois Department of Nuclear Safety

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- Question:

4. Within 60 days:of receipt of.this bulletin, arovide a written. response that (a) summarizes the-problems and the

. systems'affected, (b) identifies the short-term and g ~

long-term modifications'to plant operating proceduresfor hardware that have been or 're being: imp'lemented to ensure (c) identifies an appro

. safe-plant operations, schedule (for.long-term resolution of this and/priate-or,other-s aignificant problems that are identified as a result of this

' bulletin,s and .(d) ' prevides justification for continued.

operation particularly with regard to General Design .

Criterion 35 of Appendix A to Title 10 of the Code of

' Federal Regulations (10 CFR 50), "Emergency Core Cooling" '

and 10 CFR 50.46, "Acceptance Criteria for Emergency Core

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Cooling,.1ystem for Light Water Nuclear Power' Reactors."

Response

I. Summary of ' Affected Systems The safety-related centrifugal pumps at Clinton are:

EIN I Equipment Name *MFRL 1B33-C001A Reactor Recirculation (RR) Pump A -No

-1B33-C001B RR Pump B No .

1E12-C002A Residual Heat Removal (RHR) Pu=p A Yes

' 1E12-C002B RHR Pump B Yes 1E12-C002C RHR Pump C . , Yes 1E12-C003 RHR Water Leg Pump Yes 1E21-C001 Low Pressure Core Spray (LPCS) Pump Yes 1E21-C002 LPCS and RHR Water Leg Pump Yes-c1E22-C001 High Pressure Core Spray (HPCS) Pump Yes 1E22-C003 HPCS Water Leg Pump Yes 1E51-C001 Reactor Core Isolation Cooling (RCIC) Yes Pump 1E51-C003 RCIC Water Leg Pump Yes IFC02PA' Fuel Pool Cooling and Cleanup (FC) No Pump A 1FC02PB FC Pump B No s -y 4

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EIN I Eq pment Name MFRL 2

1G33-C001A Reactor Water Cleanup (RT) Pump A No 1G33-C001B RT Pump B No 1G33-C001C RT Pump C No ISX0lPA Shutdown Service Water (SX) Pump A No ISX01PB SX Pump B No ISX01PC SX Pump C No IVC 08PA Heating, Ventilation and Air Conditioning No Control Room Water (VC) Pump A 1VC08PB VC Pump B No

1. Equipment Identification Number.

2. Minimum Flow Recirculation Line.

A. Pump-to-Pump Interaction Tha above listed pumps are evaluated for pump-to-pump interaction, and potential dead heading, as follows:

_1 . RR Pumps A and B (IB33-C001A, 1B33-C001B)

> There is no parallel pump path between 1B33-c001A and 1B33-C001B. There is no pump-to-pump interaction.

2. RHR Pump A and LPCS Pump (1E12-C001A, lE21-C001)

The minimum flow discharge lines for the RHR A and LPCS pumps join at a point to form a common line (Reference Figure 1). The common line is connected to the full flow test line of the RHR A pump.

The minimum flow discharge lines for the RHR A and LPCS pumps are individually orificed prior to the' junction between the two pipes. The common line is large enough in area such that its resistance is a small part of the overall resistance. Sargent & Lundy Engineers determined that the j interaction between the LPCS and RHR A pump is insignificant.

3. RHR Pumps B and C (lE12-C001B, 1E12-C001C)

Tha RHR B and C pumps have a dedicated minimum flow discharge line (Reference Figure 2 and 3). The minimum flow line is typically connected to the full flow test line of the respective pump. Pump-to-pump interaction is not possible.

. 4. RHR Water Leg Pump (IEli-C003)

The RHR Water Leg Pump has a dedicated minimum flow recirculation line. The pump continuously operates on recirculation. Pump-to-pump interaction is not possible.

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5. H'PCS-Pump'(lE22-C001)

The HFGS pump has a dedicated minimum flow discharge line (Reference Figure 4). The mk.imum flow line is connected to the HPCS full flow test line. Pump-to-pump interaction is not possible.

6. HPCS Water Leg Pump (lE22-C003) >

The HPCS Water Leg Pum? has a dedicated minimum flow recirculation line. The pump continuously operates on recirculation. Pump-to-pump interaction is not possible.

7. RCIC Pump (lE51-C001)

The RCIC pump has a dedicated minimum flow discharge line (Reference Figure 5). The line is directly routed to the-suppression pool.  ? ump-to-pump interaction is not possible.

8. RCIC Water Leg Pump (lE51-C003)

The RCIC Water Leg Pum) has a dedicated minimum flow recirculation line. The pump continuously operates on

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recirculation. Pump-to-pump interaction is not possible.

9. FC Pumps A and B (1FC02PA, B)

The FC pumps normally do not operate simultaneously. When the pumps operate in parallel, the discharge flow for each pump is near the' design point. The potential for pump-to-pump interaction, while operating at low flow rates, is not possible.

3 10. RT Pumps.A, B, and C (lG33-C001A, B, C)

The RT A, B, and C pumps are each 50% capacity. The pumps continuously'o?srate near the design point. Pump-to-pump interaction, while operating at low flow rates, is not possible. ,

11, SX Pumps A, B, and C (ISX0lPA, B, C)

J The SX A, B, and C pumps function independently. The potential for pump-to-pump interaction is not possible.

12. VC Pumps A and B (0VC08PA, B)

'The VC A and B pumps function independently. The potential for pump-to-pump interaction is noc possible.

B. Adequacy of Pump Minimum Flow The listed pumps are evaluated for adequata minimum flow, as follows: ,

1. RR Pumps A and B (lB33-C001A, B)

The RR A and B pumps are constant two' speed pumps controlled by a flow control valve. The two speed pumps are run with a minimum flow control valve position of approximatel-/ 22% at power operation above approximately 30% of rated power.

Multiple interlocks prevent the pumps from running at a low flow condition.

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2. RHR Pumps A, B and C (lE12-C001A, B, C)

The RHR A, B, and C pumps re As stated in the BWR Owners' quire Group/50 gpm minimum response, flow rate.

the present mininum flow rate is expected to provide adequate protection for these pumps for the short duration postulated.

3. RHR Water Leg Pump (lE12-C003)

The RHR Water Leg Pump is designed to permit continuous operation under all conditions of operation from minimum flow to design flow without undue wear, strain, or damage to any part of the pumping unit.

4. LPCS Pumt (lE21-C0010)

The LPCS pump requires 750 gpm minimum flow rate. As stated in the BWR Owners' Group respouse, the present minimum flow rate is expected.to provide adequate protection for these pumps for the short duration postulated.

5. LPCS Water Leg Pump (IE21-C003)

The LPCS Water Leg Pump is designed to permit continucus operation fron minimum flow to design flow without undue wear, strain, or damage to any part of the pumping unit.

6. HPCS Pump (lE22-C001)

The HPCS pump requires 500 gpm minimum flo'w rate. As stated in the BWR Owners' Group response, the present minimum flow rate is, expected to provide adequate protection for these pumps for the short duration postulated.

7 HPCS Water Leg Pump (lE22-C003)

The HPCS Water Leg Pump is designed to permit continuous operation under all conditions of operation from minimum flow to design flow without undue wear, strain, or damage to any part of the pumping unit.

8. RCIC Pump (lE51-C001)

The RCIC pump requires 60 to 70 gpm minimum flow rate. The present minimum flow rate is expected to provide adequate protection for these pumps for the short duration postulated.

9. RCIC Wati.r Leg Pump (1E51-C001) tee'RGIC Water Leg Pump is designed to permit continuous operation under all conditions of operation from minimum flow to design flow without undue wear, strain, or damage to any part of the pumping unit.

10. FC Pumps A and B (lFC02PA, B)

The FC A and B pumps'are continuously operated near the design point. The pumps do not have or require minimum flow recirculation lines 4

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11. PT Pumps A, B, and C (1G33-C001A, B, C)

The RT pumps are continuously operated near the design point. The pumps do not have or require minimum flow recirculation linea.

12. SX Pumps A and B (ISX01PA, B)

The SX A and b pumps operate at or near the deoign point during accident conditions. The pumps can operate below the design point during testing and low load conditions. The operating procedures caution the operator to maintain the flow rate at least 50% of the design flow rate. This practice ensures the pumps are not operated in the low flow region.

13. SX Pump C (ISX01PC)

The~SX C pump operates at or near the design point during accident conditions. The pump can operate below the design point during testing and low load conditions. The operating procedure requires the diesel generator cooling valve (ISX006C) to be opened. This establishes a flow rate for the pump at least 50% of the design flow rate. This practice ensures the pump is not operated in the low flow region.

14. VC Pumps A and B (1VC08PA, B)

The VC A and B pumps operate continuously near the design point. The pumps do not have or require minimum flow recirculation lines.

II. Short Term and Long Term Modifications As stated in Section I.B. the RHR, IIPCS, LPCS and RCIC primary pumas have minimum flow recirculation lines. The flow rate through the minimum flow line is expected to provide adequate protection for the pumps during the short durations postulated.

, These pumps are included in the ASME Section XI testing program. Pump degradation will be identified by this program.

To provide an added level of assurance, Clinton will do the following:

(1) Evaluate changes to the plant operating procedures for the HPCS, LPCS and RHR systems to minimize the time in the minimum flow mode. The RCIC procedures were revised during initial plant startup, to minimize the time RCIC operates on minimum flow (2) Evaluate a program which will routinely monitor the pump vibration signatures.

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e III. Schedule

'All affected procedures will be completed by December 9, 1989.-

Evaluation of the RHR, HPCS, LPCS and'RCIC pumps for

-inclusion into-the vibration monitoring program will be completed by August 30, 1989.

IV.- Justification'for Continued Operation The'BWR Owners' Group response dated June 29, 1988, provides a justification for continuod operation.

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