ML20216D557
| ML20216D557 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 03/12/1998 |
| From: | Hopkins J NRC (Affiliation Not Assigned) |
| To: | Sipek J ILLINOIS POWER CO. |
| References | |
| GL-96-06, GL-96-6, TAC-M96796, NUDOCS 9803170111 | |
| Download: ML20216D557 (6) | |
Text
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March 12, 1998 Mr. Joseph V. Sipek Director-Licensing Clinton Power Station P.O. Box 676 Mail Code V920 Clinton,IL 61727
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE GL 96-06 RESPONSE FOR THE CLINTON POWER STATION, UNIT 1 (TAC NO. M96796)
Dear Mr. Sipek:
Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containment Integrity During Design-Basis Accident Conditions," dated September 30,1996, included a request for licensees to evaluate cooling water systems that serve containment air coolers to assure that they are not vulnerable to water hammer and two-phase flow conditions. You provided your assessment for the Clinton Power Station in letters dated January 28, and July 24,1997.
In order to complete our review of your resolution of the water hammer and two-phase flow issues, we require additional information as discussed in the enclosure. We request that you provide this information by June 15,1998.
Your resolution of the thermal pressurization issue is continuing to be reviewed by the NRC staff. If necessary, a separate request for additional information will be sent to you for that issue.
Contact me if you have any questions.
Sincerely, Original signed by:
Jon B. Hopkins, Senior Project Manager Project Directorate 111-3 Division of Reactor Projects lil/IV Office of Nuclear Reactor Regulation Docket No. 50-461 Distribution:
Docket File PUBLIC
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Request for Additional PD3-3 R/F ACRS Information JTatum OGC i
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March 12, 1998 Mr. Joseph V. Sipek Director - Licensing Clinton Power Station P.O. Box 678 i
Mail Code V920 Clinton,IL 61727
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE GL 96-06 RESPONSE FOR THE CLINTON POWER STATION, UNIT 1 (TAC NO. M96796)
Dear Mr. Sipek:
Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containment Integrity During Design-Basis Accident Conditions," dated September 30,1996, included a request for licensees to evaluate cooling water systems that serve containment air coolers to assure that they are not vulnerable to water hammer and two-phase flow conditions. You provided your assessment for the Clinton Power Station in letters dated January 28, and July 24,1997.
In order to complete our leview of your resolution of the water hammer and two-phase flow issues, we require additionalinformation as discussed in the enclosure. We request that you provide this infonnation by June 15,1998.
Your resolution of the thermal pressurization issue is continuing to be reviewed by the NRC i
staff. If necessary, a separate request for additional information will be sent to you for that issue.
Contact me if you have any questions.
Sincerely, Original signed by:
Jon B. Hopkins, Senior Project Manager Project Directorate lll-3 Division of Reactor Projects lil/IV Office of Nuclear Reactor Regulation i
Docket No. 50-461 Distribution:
Docket File PUBLIC
Enclosure:
Request for Additional PD3-3 R/F ACRS 4
Information JTatum OGC EGA1 GGrant, Rlli ec w/ encl: See next page RSavio Document Name: G:\\CLINTON\\GL9606.RAI
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0FFICE PM:PDIII-3 E. LA:PDIII-3 lE NAME JHopkins b
EBarnhill PA' DATE 3 /ik/98 $\\
.3 // v/98 1
0FFICIAL RECORD COPY i
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NUCLEAR REGULATORY COMMISSION 2
WASHINGTON, D.C *D0864001
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March 12, 1998 Mr. Joseph V. Sipek Director-Licensing Clinton Power Station P.O. Box 678 Mail Code V920 Clinton,IL 61727
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE GL 96-06 RESPONSE FOR THE CLINTON POWER STATION, UNIT 1 (TAC NO. M96796)
Dear Mr. Sipek:
Generic Letter (GL) 96-06, Assurance of Equipment Operability and Containment integrity During Design-Basis Accident Conditions," dated September 30,1996, included a request for licensees to evaluate cooling water systems that serve containmerit air coolers to assure that they are not vulnerable to water hammer and two-phase flow conditions. You provided your assessment for the Clinton Power Station in letters dated January 28, and July 24,1997.
I in order to complete our review of your resolution of the water hammer and two-phase flow issues, we require additional information as discussed in the enclosure. We request that you provide this information by June 15,1998.
Your resolution of the thermal pressurization issue is continuing to be reviewed by the NRC staff. If necessary, a separate request for additionalinformation will be sent to you for that issue.
Contact me if you have any questions.
Sincerely, i
Jon D. Hopkins, Seni r Project Manager Project Directorate 111-3 Division of Reactor Projects lil/IV Office of Nuclear Reactor Regulation Docket No. 50-461
Enclosure:
Request for Additional Information cc w/ encl: See next page
i.
- Joseph V. Sipek Clinton Power Station, Unit 1 Illinois Power Company i
l cc:
l l
John G. Cook lilinois Department of Nuclear Safety Senior Vice President Office of Nuclear Facility Safety Clinton Power Station 1035 Outer Park Drive P.0, Box 678 Springfield,IL 62704 Clinton,IL 61727 l
Larry Wigley i
Manager Nuclear Station Engineering Department Clinton Power Station P.O. Box 678 Clinton,IL 61727 Resident inspector U.S. Nuclear Regulatory Commission RR#3, Box 229 A Clinton,IL 61727 R. T. Hill l
Licensing Services Manager l
General Electric Company 175 Curtner Avenue, M/C 481 San Jose, CA 95125 Regional Administrator, Region 111 U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, IL 60532-4351 Chairman of DeWitt County clo County Clerk's Office DeWitt County Courthouse Clinton,IL 61727 J. W. Blattner Project Manager Saigent & Lundy Engineers 55 East Monroe Street Chicago,IL 60603 l
l I
l
1 REQUEST FOR ADDITIONAL INFORMATION FOR RESOLUTION OF GL 96-06 ISSUES AT1HE CLINTON POWER STATION (TAC NO. M96796) l Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containment integrity During Design Basis Accident Conditions," dated September 30,1996, included a request for licensees to evaluate cooling water systems that serve containment air coolers to assure that they are not vulnerable to water hammer and two-phase flow conditions. Illinois Power Company (the licensee) provided its assessment for the Clinton Power Station in letters dated
. January 28, and July 24,1997. In order to adequately asstr6s the licensee's resolution of the water hammer and two-phase flow issues, the following additional information is requested:
1.
If a methodology other than that o'scussed in NUREG/CR-5220, " Diagnosis of Condensation-Induced Water Haminer," was used in evaluating the effects of water hammer, describe this attemate methodology in detail. Also, explain why this methodology is applicable and gives conservative results for the Clinton unit (typically accomplished through rigorous plant-specific modeling, testing, and analysis).
2.
For both the water hammer and two-phase flow analyses, provide the following information:
a.
Identify any computer codes that were used in the water hammer and two-phase i
flow analyses and describe the methods used to bench mark the codes for the specific loading conditions involved (se;e Standard Review Plan Section 3.9.1).
b.
Describe and justify all assumptions and input parameters (including those used in any computer codes) such as amplifications due to fluid structure interaction, cushioning, speed of sound, force reductions, and mesh sizes, and explain why the values selected give conservative results. Also, provide justification for omitting any effects that may be relevant to the analysis (e.g., fluid structure interaction, flow induced vibration, erosion),
c.
Provide a detailed description of the " worst case" scenarios for water hammer and two-phase flow, taking into consideration the complete range of event j
possibilities, time of system alignment, system configurations, and parameters.
For example, all water hammer types and water slug scenarios should be considered, as well as temperatures, pressures, flow rates, load combinations, and potential component failures. Additional examples include:
the effects of void fraction on flow balance and heat transfer; the consequences of steam formation, transport. and accumulation; a
cavitction, resonance, and fatigue effects; and
=
erosion considerations.
2 Licensees may find NUREG/CR-6031, " Cavitation Guide for Control Valves,"
helpful in addressing some aspects of the two-phase flow analyses.
d.
Confirm that the analyses included a complete failure modes and effects analysis (FMEA) for all components (including electrical and pneumatic failures) that could impact performance of the cooling water system, and confirm that the FMEA is documented and available for review, or explain why a complete and l
fully documented FMEA was not performed.
e.
Explain and justify all uses of " engineering judgment."
3.
Determine the uncertainty in the water hammer and two-phase flow analyses, explain inw the uncertainty was determined, and how it was accounted for in the analyses to assure conservative results for the Clinton Power Station.
4.
. Confirm that the water hammer and two-phase flow loading, conditions do not exceed any design speci'ications or recommended service conditions for the piping system and components, including those stated by equipment vendors; and confirm that the system integrity w!!! be maintained.
5.
Provide a simplified diagram of the system, showing major components, active
' components, relative elevations, lengths of piping runs, and the location of any orifices i
and flow restrictions.
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